././@PaxHeader0000000000000000000000000000003200000000000010210 xustar0026 mtime=1738482098.77512 h2-4.2.0/0000755000076500000240000000000014747620663011406 5ustar00kriechistaff././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1738482064.0 h2-4.2.0/CHANGELOG.rst0000644000076500000240000007443414747620620013434 0ustar00kriechistaffRelease History =============== 4.2.0 (2025-02-01) ------------------ **API Changes (Backward Incompatible)** - Support for Python 3.6 has been removed. - Support for Python 3.7 has been removed. - Support for Python 3.8 has been removed. - Remove mistakenly set `max_inbound_frame_size` attribute on `H2Stream`. **API Changes (Backward Compatible)** - Support for Python 3.11 has been added. - Support for Python 3.12 has been added. - Support for Python 3.13 has been added. - Add an ability to send outbound cookies separately to improve headers compression. - Updated packaging and testing infrastructure. **Bugfixes** - Fix repr() checks for Python 3.11 - Fix asyncio / wsgi examples. - Clarify docs on using curl with http2. 4.1.0 (2021-10-05) ------------------ **Note:** The GitHub repository has been renamed to ``python-hyper/h2``, previously was ``python-hyper/hyper-h2``. **The name of the package on PyPI is unchanged!** API Changes (Backward-Compatible) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - Support for Python 3.9 has been added. - Support for Python 3.10 has been added. - New example for a Python socket HTTP/2 client. - New `OutputLogger` for use with ``h2.config.logger``. This is only provided for convenience and not part of the stable API. Bugfixes ~~~~~~~~ - Header validation now rejects empty header names with a ProtocolError. While hpack decodes such header blocks without issues, they violate the HTTP semantics. - Fix TE header name in error message. 4.0.0 (2020-09-19) ------------------ API Changes (Backward-Incompatible) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - Support for Python 2.7 has been removed. - Support for Python 3.4 has been removed. - Support for Python 3.5 has been removed. - Support for PyPy (Python 2.7 compatible) has been removed. - Support for Python 3.8 has been added. - Receiving DATA before HEADERS now raises a ProtocolError (see https://tools.ietf.org/html/rfc7540#section-8.1) 3.2.0 (2020-02-08) ------------------ Bugfixes ~~~~~~~~ - Receiving DATA frames on closed (or reset) streams now properly emit a WINDOW_UPDATE to keep the connection flow window topped up. API Changes (Backward-Incompatible) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - ``h2.config.logger`` now uses a `trace(...)` function, in addition to `debug(...)`. If you defined a custom logger object, you need to handle these new function calls. 3.1.1 (2019-08-02) ------------------ Bugfixes ~~~~~~~~ - Ignore WINDOW_UPDATE and RST_STREAM frames received after stream closure. 3.1.0 (2019-01-22) ------------------ API Changes (Backward-Incompatible) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - ``h2.connection.H2Connection.data_to_send`` first and only argument ``amt`` was renamed to ``amount``. - Support for Python 3.3 has been removed. API Changes (Backward-Compatible) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - ``h2.connection.H2Connection.send_data`` now supports ``data`` parameter being a ``memoryview`` object. - Refactor ping-related events: a ``h2.events.PingReceived`` event is fired when a PING frame is received and a ``h2.events.PingAckReceived`` event is fired when a PING frame with an ACK flag is received. ``h2.events.PingAcknowledged`` is deprecated in favour of the identical ``h2.events.PingAckReceived``. - Added ``ENABLE_CONNECT_PROTOCOL`` to ``h2.settings.SettingCodes``. - Support ``CONNECT`` requests with a ``:protocol`` pseudo header thereby supporting RFC 8441. - A limit to the number of closed streams kept in memory by the connection is applied. It can be configured by ``h2.connection.H2Connection.MAX_CLOSED_STREAMS``. Bugfixes ~~~~~~~~ - Debug logging when stream_id is None is now fixed and no longer errors. 3.0.1 (2017-04-03) ------------------ Bugfixes ~~~~~~~~ - CONTINUATION frames sent on closed streams previously caused stream errors of type STREAM_CLOSED. RFC 7540 § 6.10 requires that these be connection errors of type PROTOCOL_ERROR, and so this release changes to match that behaviour. - Remote peers incrementing their inbound connection window beyond the maximum allowed value now cause stream-level errors, rather than connection-level errors, allowing connections to stay up longer. - h2 now rejects receiving and sending request header blocks that are missing any of the mandatory pseudo-header fields (:path, :scheme, and :method). - h2 now rejects receiving and sending request header blocks that have an empty :path pseudo-header value. - h2 now rejects receiving and sending request header blocks that contain response-only pseudo-headers, and vice versa. - h2 now correct respects user-initiated changes to the HEADER_TABLE_SIZE local setting, and ensures that if users shrink or increase the header table size it is policed appropriately. 2.6.2 (2017-04-03) ------------------ Bugfixes ~~~~~~~~ - CONTINUATION frames sent on closed streams previously caused stream errors of type STREAM_CLOSED. RFC 7540 § 6.10 requires that these be connection errors of type PROTOCOL_ERROR, and so this release changes to match that behaviour. - Remote peers incrementing their inbound connection window beyond the maximum allowed value now cause stream-level errors, rather than connection-level errors, allowing connections to stay up longer. - h2 now rejects receiving and sending request header blocks that are missing any of the mandatory pseudo-header fields (:path, :scheme, and :method). - h2 now rejects receiving and sending request header blocks that have an empty :path pseudo-header value. - h2 now rejects receiving and sending request header blocks that contain response-only pseudo-headers, and vice versa. - h2 now correct respects user-initiated changes to the HEADER_TABLE_SIZE local setting, and ensures that if users shrink or increase the header table size it is policed appropriately. 2.5.4 (2017-04-03) ------------------ Bugfixes ~~~~~~~~ - CONTINUATION frames sent on closed streams previously caused stream errors of type STREAM_CLOSED. RFC 7540 § 6.10 requires that these be connection errors of type PROTOCOL_ERROR, and so this release changes to match that behaviour. - Remote peers incrementing their inbound connection window beyond the maximum allowed value now cause stream-level errors, rather than connection-level errors, allowing connections to stay up longer. - h2 now correct respects user-initiated changes to the HEADER_TABLE_SIZE local setting, and ensures that if users shrink or increase the header table size it is policed appropriately. 3.0.0 (2017-03-24) ------------------ API Changes (Backward-Incompatible) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - By default, hyper-h2 now joins together received cookie header fields, per RFC 7540 Section 8.1.2.5. - Added a ``normalize_inbound_headers`` flag to the ``H2Configuration`` object that defaults to ``True``. Setting this to ``False`` changes the behaviour from the previous point back to the v2 behaviour. - Removed deprecated fields from ``h2.errors`` module. - Removed deprecated fields from ``h2.settings`` module. - Removed deprecated ``client_side`` and ``header_encoding`` arguments from ``H2Connection``. - Removed deprecated ``client_side`` and ``header_encoding`` properties from ``H2Connection``. - ``dict`` objects are no longer allowed for user-supplied headers. - The default header encoding is now ``None``, not ``utf-8``: this means that all events that carry headers now return those headers as byte strings by default. The header encoding can be set back to ``utf-8`` to restore the old behaviour. API Changes (Backward-Compatible) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - Added new ``UnknownFrameReceived`` event that fires when unknown extension frames have been received. This only fires when using hyperframe 5.0 or later: earlier versions of hyperframe cause us to silently ignore extension frames. Bugfixes ~~~~~~~~ None 2.6.1 (2017-03-16) ------------------ Bugfixes ~~~~~~~~ - Allowed hyperframe v5 support while continuing to ignore unexpected frames. 2.5.3 (2017-03-16) ------------------ Bugfixes ~~~~~~~~ - Allowed hyperframe v5 support while continuing to ignore unexpected frames. 2.4.4 (2017-03-16) ------------------ Bugfixes ~~~~~~~~ - Allowed hyperframe v5 support while continuing to ignore unexpected frames. 2.6.0 (2017-02-28) ------------------ API Changes (Backward-Compatible) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - Added a new ``h2.events.Event`` class that acts as a base class for all events. - Rather than reject outbound Connection-specific headers, h2 will now normalize the header block by removing them. - Implement equality for the ``h2.settings.Settings`` class. - Added ``h2.settings.SettingCodes``, an enum that is used to store all the HTTP/2 setting codes. This allows us to use a better printed representation of the setting code in most places that it is used. - The ``setting`` field in ``ChangedSetting`` for the ``RemoteSettingsChanged`` and ``SettingsAcknowledged`` events has been updated to be instances of ``SettingCodes`` whenever they correspond to a known setting code. When they are an unknown setting code, they are instead ``int``. As ``SettingCodes`` is a subclass of ``int``, this is non-breaking. - Deprecated the other fields in ``h2.settings``. These will be removed in 3.0.0. - Added an optional ``pad_length`` parameter to ``H2Connection.send_data`` to allow the user to include padding on a data frame. - Added a new parameter to the ``h2.config.H2Configuration`` initializer which takes a logger. This allows us to log by providing a logger that conforms to the requirements of this module so that it can be used in different environments. Bugfixes ~~~~~~~~ - Correctly reject pushed request header blocks whenever they have malformed request header blocks. - Correctly normalize pushed request header blocks whenever they have normalizable header fields. - Remote peers are now allowed to send zero or any positive number as a value for ``SETTINGS_MAX_HEADER_LIST_SIZE``, where previously sending zero would raise a ``InvalidSettingsValueError``. - Resolved issue where the ``HTTP2-Settings`` header value for plaintext upgrade that was emitted by ``initiate_upgrade_connection`` included the *entire* ``SETTINGS`` frame, instead of just the payload. - Resolved issue where the ``HTTP2-Settings`` header value sent by a client for plaintext upgrade would be ignored by ``initiate_upgrade_connection``, rather than have those settings applied appropriately. - Resolved an issue whereby certain frames received from a peer in the CLOSED state would trigger connection errors when RFC 7540 says they should have triggered stream errors instead. Added more detailed stream closure tracking to ensure we don't throw away connections unnecessarily. 2.5.2 (2017-01-27) ------------------ - Resolved issue where the ``HTTP2-Settings`` header value for plaintext upgrade that was emitted by ``initiate_upgrade_connection`` included the *entire* ``SETTINGS`` frame, instead of just the payload. - Resolved issue where the ``HTTP2-Settings`` header value sent by a client for plaintext upgrade would be ignored by ``initiate_upgrade_connection``, rather than have those settings applied appropriately. 2.4.3 (2017-01-27) ------------------ - Resolved issue where the ``HTTP2-Settings`` header value for plaintext upgrade that was emitted by ``initiate_upgrade_connection`` included the *entire* ``SETTINGS`` frame, instead of just the payload. - Resolved issue where the ``HTTP2-Settings`` header value sent by a client for plaintext upgrade would be ignored by ``initiate_upgrade_connection``, rather than have those settings applied appropriately. 2.3.4 (2017-01-27) ------------------ - Resolved issue where the ``HTTP2-Settings`` header value for plaintext upgrade that was emitted by ``initiate_upgrade_connection`` included the *entire* ``SETTINGS`` frame, instead of just the payload. - Resolved issue where the ``HTTP2-Settings`` header value sent by a client for plaintext upgrade would be ignored by ``initiate_upgrade_connection``, rather than have those settings applied appropriately. 2.5.1 (2016-12-17) ------------------ Bugfixes ~~~~~~~~ - Remote peers are now allowed to send zero or any positive number as a value for ``SETTINGS_MAX_HEADER_LIST_SIZE``, where previously sending zero would raise a ``InvalidSettingsValueError``. 2.5.0 (2016-10-25) ------------------ API Changes (Backward-Compatible) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - Added a new ``H2Configuration`` object that allows rich configuration of a ``H2Connection``. This object supersedes the prior keyword arguments to the ``H2Connection`` object, which are now deprecated and will be removed in 3.0. - Added support for automated window management via the ``acknowledge_received_data`` method. See the documentation for more details. - Added a ``DenialOfServiceError`` that is raised whenever a behaviour that looks like a DoS attempt is encountered: for example, an overly large decompressed header list. This is a subclass of ``ProtocolError``. - Added support for setting and managing ``SETTINGS_MAX_HEADER_LIST_SIZE``. This setting is now defaulted to 64kB. - Added ``h2.errors.ErrorCodes``, an enum that is used to store all the HTTP/2 error codes. This allows us to use a better printed representation of the error code in most places that it is used. - The ``error_code`` fields on ``ConnectionTerminated`` and ``StreamReset`` events have been updated to be instances of ``ErrorCodes`` whenever they correspond to a known error code. When they are an unknown error code, they are instead ``int``. As ``ErrorCodes`` is a subclass of ``int``, this is non-breaking. - Deprecated the other fields in ``h2.errors``. These will be removed in 3.0.0. Bugfixes ~~~~~~~~ - Correctly reject request header blocks with neither :authority nor Host headers, or header blocks which contain mismatched :authority and Host headers, per RFC 7540 Section 8.1.2.3. - Correctly expect that responses to HEAD requests will have no body regardless of the value of the Content-Length header, and reject those that do. - Correctly refuse to send header blocks that contain neither :authority nor Host headers, or header blocks which contain mismatched :authority and Host headers, per RFC 7540 Section 8.1.2.3. - Hyper-h2 will now reject header field names and values that contain leading or trailing whitespace. - Correctly strip leading/trailing whitespace from header field names and values. - Correctly refuse to send header blocks with a TE header whose value is not ``trailers``, per RFC 7540 Section 8.1.2.2. - Correctly refuse to send header blocks with connection-specific headers, per RFC 7540 Section 8.1.2.2. - Correctly refuse to send header blocks that contain duplicate pseudo-header fields, or with pseudo-header fields that appear after ordinary header fields, per RFC 7540 Section 8.1.2.1. This may cause passing a dictionary as the header block to ``send_headers`` to throw a ``ProtocolError``, because dictionaries are unordered and so they may trip this check. Passing dictionaries here is deprecated, and callers should change to using a sequence of 2-tuples as their header blocks. - Correctly reject trailers that contain HTTP/2 pseudo-header fields, per RFC 7540 Section 8.1.2.1. - Correctly refuse to send trailers that contain HTTP/2 pseudo-header fields, per RFC 7540 Section 8.1.2.1. - Correctly reject responses that do not contain the ``:status`` header field, per RFC 7540 Section 8.1.2.4. - Correctly refuse to send responses that do not contain the ``:status`` header field, per RFC 7540 Section 8.1.2.4. - Correctly update the maximum frame size when the user updates the value of that setting. Prior to this release, if the user updated the maximum frame size hyper-h2 would ignore the update, preventing the remote peer from using the higher frame sizes. 2.4.2 (2016-10-25) ------------------ Bugfixes ~~~~~~~~ - Correctly update the maximum frame size when the user updates the value of that setting. Prior to this release, if the user updated the maximum frame size hyper-h2 would ignore the update, preventing the remote peer from using the higher frame sizes. 2.3.3 (2016-10-25) ------------------ Bugfixes ~~~~~~~~ - Correctly update the maximum frame size when the user updates the value of that setting. Prior to this release, if the user updated the maximum frame size hyper-h2 would ignore the update, preventing the remote peer from using the higher frame sizes. 2.2.7 (2016-10-25) ------------------ *Final 2.2.X release* Bugfixes ~~~~~~~~ - Correctly update the maximum frame size when the user updates the value of that setting. Prior to this release, if the user updated the maximum frame size hyper-h2 would ignore the update, preventing the remote peer from using the higher frame sizes. 2.4.1 (2016-08-23) ------------------ Bugfixes ~~~~~~~~ - Correctly expect that responses to HEAD requests will have no body regardless of the value of the Content-Length header, and reject those that do. 2.3.2 (2016-08-23) ------------------ Bugfixes ~~~~~~~~ - Correctly expect that responses to HEAD requests will have no body regardless of the value of the Content-Length header, and reject those that do. 2.4.0 (2016-07-01) ------------------ API Changes (Backward-Compatible) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - Adds ``additional_data`` to ``H2Connection.close_connection``, allowing the user to send additional debug data on the GOAWAY frame. - Adds ``last_stream_id`` to ``H2Connection.close_connection``, allowing the user to manually control what the reported last stream ID is. - Add new method: ``prioritize``. - Add support for emitting stream priority information when sending headers frames using three new keyword arguments: ``priority_weight``, ``priority_depends_on``, and ``priority_exclusive``. - Add support for "related events": events that fire simultaneously on a single frame. 2.3.1 (2016-05-12) ------------------ Bugfixes ~~~~~~~~ - Resolved ``AttributeError`` encountered when receiving more than one sequence of CONTINUATION frames on a given connection. 2.2.5 (2016-05-12) ------------------ Bugfixes ~~~~~~~~ - Resolved ``AttributeError`` encountered when receiving more than one sequence of CONTINUATION frames on a given connection. 2.3.0 (2016-04-26) ------------------ API Changes (Backward-Compatible) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - Added a new flag to the ``H2Connection`` constructor: ``header_encoding``, that controls what encoding is used (if any) to decode the headers from bytes to unicode. This defaults to UTF-8 for backward compatibility. To disable the decode and use bytes exclusively, set the field to False, None, or the empty string. This affects all headers, including those pushed by servers. - Bumped the minimum version of HPACK allowed from 2.0 to 2.2. - Added support for advertising RFC 7838 Alternative services. - Allowed users to provide ``hpack.HeaderTuple`` and ``hpack.NeverIndexedHeaderTuple`` objects to all methods that send headers. - Changed all events that carry headers to emit ``hpack.HeaderTuple`` and ``hpack.NeverIndexedHeaderTuple`` instead of plain tuples. This allows users to maintain header indexing state. - Added support for plaintext upgrade with the ``initiate_upgrade_connection`` method. Bugfixes ~~~~~~~~ - Automatically ensure that all ``Authorization`` and ``Proxy-Authorization`` headers, as well as short ``Cookie`` headers, are prevented from being added to encoding contexts. 2.2.4 (2016-04-25) ------------------ Bugfixes ~~~~~~~~ - Correctly forbid pseudo-headers that were not defined in RFC 7540. - Ignore AltSvc frames, rather than exploding when receiving them. 2.1.5 (2016-04-25) ------------------ *Final 2.1.X release* Bugfixes ~~~~~~~~ - Correctly forbid pseudo-headers that were not defined in RFC 7540. - Ignore AltSvc frames, rather than exploding when receiving them. 2.2.3 (2016-04-13) ------------------ Bugfixes ~~~~~~~~ - Allowed the 4.X series of hyperframe releases as dependencies. 2.1.4 (2016-04-13) ------------------ Bugfixes ~~~~~~~~ - Allowed the 4.X series of hyperframe releases as dependencies. 2.2.2 (2016-04-05) ------------------ Bugfixes ~~~~~~~~ - Fixed issue where informational responses were erroneously not allowed to be sent in the ``HALF_CLOSED_REMOTE`` state. - Fixed issue where informational responses were erroneously not allowed to be received in the ``HALF_CLOSED_LOCAL`` state. - Fixed issue where we allowed information responses to be sent or received after final responses. 2.2.1 (2016-03-23) ------------------ Bugfixes ~~~~~~~~ - Fixed issue where users using locales that did not default to UTF-8 were unable to install source distributions of the package. 2.2.0 (2016-03-23) ------------------ API Changes (Backward-Compatible) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - Added support for sending informational responses (responses with 1XX status) codes as part of the standard flow. HTTP/2 allows zero or more informational responses with no upper limit: hyper-h2 does too. - Added support for receiving informational responses (responses with 1XX status) codes as part of the standard flow. HTTP/2 allows zero or more informational responses with no upper limit: hyper-h2 does too. - Added a new event: ``ReceivedInformationalResponse``. This response is fired when informational responses (those with 1XX status codes). - Added an ``additional_data`` field to the ``ConnectionTerminated`` event that carries any additional data sent on the GOAWAY frame. May be ``None`` if no such data was sent. - Added the ``initial_values`` optional argument to the ``Settings`` object. Bugfixes ~~~~~~~~ - Correctly reject all of the connection-specific headers mentioned in RFC 7540 § 8.1.2.2, not just the ``Connection:`` header. - Defaulted the value of ``SETTINGS_MAX_CONCURRENT_STREAMS`` to 100, unless explicitly overridden. This is a safe defensive initial value for this setting. 2.1.3 (2016-03-16) ------------------ Deprecations ~~~~~~~~~~~~ - Passing dictionaries to ``send_headers`` as the header block is deprecated, and will be removed in 3.0. 2.1.2 (2016-02-17) ------------------ Bugfixes ~~~~~~~~ - Reject attempts to push streams on streams that were themselves pushed: streams can only be pushed on streams that were initiated by the client. - Correctly allow CONTINUATION frames to extend the header block started by a PUSH_PROMISE frame. - Changed our handling of frames received on streams that were reset by the user. Previously these would, at best, cause ProtocolErrors to be raised and the connection to be torn down (rather defeating the point of resetting streams at all) and, at worst, would cause subtle inconsistencies in state between hyper-h2 and the remote peer that could lead to header block decoding errors or flow control blockages. Now when the user resets a stream all further frames received on that stream are ignored except where they affect some form of connection-level state, where they have their effect and are then ignored. - Fixed a bug whereby receiving a PUSH_PROMISE frame on a stream that was closed would cause a RST_STREAM frame to be emitted on the closed-stream, but not the newly-pushed one. Now this causes a ``ProtocolError``. 2.1.1 (2016-02-05) ------------------ Bugfixes ~~~~~~~~ - Added debug representations for all events. - Fixed problems with setup.py that caused trouble on older setuptools/pip installs. 2.1.0 (2016-02-02) ------------------ API Changes (Backward-Compatible) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - Added new field to ``DataReceived``: ``flow_controlled_length``. This is the length of the frame including padded data, allowing users to correctly track changes to the flow control window. - Defined new ``UnsupportedFrameError``, thrown when frames that are known to hyperframe but not supported by hyper-h2 are received. For backward-compatibility reasons, this is a ``ProtocolError`` *and* a ``KeyError``. Bugfixes ~~~~~~~~ - Hyper-h2 now correctly accounts for padding when maintaining flow control windows. - Resolved a bug where hyper-h2 would mistakenly apply SETTINGS_INITIAL_WINDOW_SIZE to the connection flow control window in addition to the stream-level flow control windows. - Invalid Content-Length headers now throw ``ProtocolError`` exceptions and correctly tear the connection down, instead of leaving the connection in an indeterminate state. - Invalid header blocks now throw ``ProtocolError``, rather than a grab bag of possible other exceptions. 2.0.0 (2016-01-25) ------------------ API Changes (Breaking) ~~~~~~~~~~~~~~~~~~~~~~ - Attempts to open streams with invalid stream IDs, either by the remote peer or by the user, are now rejected as a ``ProtocolError``. Previously these were allowed, and would cause remote peers to error. - Receiving frames that have invalid padding now causes the connection to be terminated with a ``ProtocolError`` being raised. Previously these passed undetected. - Settings values set by both the user and the remote peer are now validated when they're set. If they're invalid, a new ``InvalidSettingsValueError`` is raised and, if set by the remote peer, a connection error is signaled. Previously, it was possible to set invalid values. These would either be caught when building frames, or would be allowed to stand. - Settings changes no longer require user action to be acknowledged: hyper-h2 acknowledges them automatically. This moves the location where some exceptions may be thrown, and also causes the ``acknowledge_settings`` method to be removed from the public API. - Removed a number of methods on the ``H2Connection`` object from the public, semantically versioned API, by renaming them to have leading underscores. Specifically, removed: - ``get_stream_by_id`` - ``get_or_create_stream`` - ``begin_new_stream`` - ``receive_frame`` - ``acknowledge_settings`` - Added full support for receiving CONTINUATION frames, including policing logic about when and how they are received. Previously, receiving CONTINUATION frames was not supported and would throw exceptions. - All public API functions on ``H2Connection`` except for ``receive_data`` no longer return lists of events, because these lists were always empty. Events are now only raised by ``receive_data``. - Calls to ``increment_flow_control_window`` with out of range values now raise ``ValueError`` exceptions. Previously they would be allowed, or would cause errors when serializing frames. API Changes (Backward-Compatible) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - Added ``PriorityUpdated`` event for signaling priority changes. - Added ``get_next_available_stream_id`` function. - Receiving DATA frames on streams not in the OPEN or HALF_CLOSED_LOCAL states now causes a stream reset, rather than a connection reset. The error is now also classified as a ``StreamClosedError``, rather than a more generic ``ProtocolError``. - Receiving HEADERS or PUSH_PROMISE frames in the HALF_CLOSED_REMOTE state now causes a stream reset, rather than a connection reset. - Receiving frames that violate the max frame size now causes connection errors with error code FRAME_SIZE_ERROR, not a generic PROTOCOL_ERROR. This condition now also raises a ``FrameTooLargeError``, a new subclass of ``ProtocolError``. - Made ``NoSuchStreamError`` a subclass of ``ProtocolError``. - The ``StreamReset`` event is now also fired whenever a protocol error from the remote peer forces a stream to close early. This is only fired once. - The ``StreamReset`` event now carries a flag, ``remote_reset``, that is set to ``True`` in all cases where ``StreamReset`` would previously have fired (e.g. when the remote peer sent a RST_STREAM), and is set to ``False`` when it fires because the remote peer made a protocol error. - Hyper-h2 now rejects attempts by peers to increment a flow control window by zero bytes. - Hyper-h2 now rejects peers sending header blocks that are ill-formed for a number of reasons as set out in RFC 7540 Section 8.1.2. - Attempting to send non-PRIORITY frames on closed streams now raises ``StreamClosedError``. - Remote peers attempting to increase the flow control window beyond ``2**31 - 1``, either by window increment or by settings frame, are now rejected as ``ProtocolError``. - Local attempts to increase the flow control window beyond ``2**31 - 1`` by window increment are now rejected as ``ProtocolError``. - The bytes that represent individual settings are now available in ``h2.settings``, instead of needing users to import them from hyperframe. Bugfixes ~~~~~~~~ - RFC 7540 requires that a separate minimum stream ID be used for inbound and outbound streams. Hyper-h2 now obeys this requirement. - Hyper-h2 now does a better job of reporting the last stream ID it has partially handled when terminating connections. - Fixed an error in the arguments of ``StreamIDTooLowError``. - Prevent ``ValueError`` leaking from Hyperframe. - Prevent ``struct.error`` and ``InvalidFrameError`` leaking from Hyperframe. 1.1.1 (2015-11-17) ------------------ Bugfixes ~~~~~~~~ - Forcibly lowercase all header names to improve compatibility with implementations that demand lower-case header names. 1.1.0 (2015-10-28) ------------------ API Changes (Backward-Compatible) ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - Added a new ``ConnectionTerminated`` event, which fires when GOAWAY frames are received. - Added a subclass of ``NoSuchStreamError``, called ``StreamClosedError``, that fires when actions are taken on a stream that is closed and has had its state flushed from the system. - Added ``StreamIDTooLowError``, raised when the user or the remote peer attempts to create a stream with an ID lower than one previously used in the dialog. Inherits from ``ValueError`` for backward-compatibility reasons. Bugfixes ~~~~~~~~ - Do not throw ``ProtocolError`` when attempting to send multiple GOAWAY frames on one connection. - We no longer forcefully change the decoder table size when settings changes are ACKed, instead waiting for remote acknowledgement of the change. - Improve the performance of checking whether a stream is open. - We now attempt to lazily garbage collect closed streams, to avoid having the state hang around indefinitely, leaking memory. - Avoid further per-stream allocations, leading to substantial performance improvements when many short-lived streams are used. 1.0.0 (2015-10-15) ------------------ - First production release! ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1584304126.0 h2-4.2.0/LICENSE0000644000076500000240000000211613633507776012415 0ustar00kriechistaffThe MIT License (MIT) Copyright (c) 2015-2020 Cory Benfield and contributors Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737582431.0 h2-4.2.0/MANIFEST.in0000644000076500000240000000040714744263537013145 0ustar00kriechistaffgraft src/h2 graft docs graft tests graft visualizer graft examples prune docs/build recursive-include examples *.py *.crt *.key *.pem *.csr include README.rst LICENSE CHANGELOG.rst pyproject.toml global-exclude *.pyc *.pyo *.swo *.swp *.map *.yml *.DS_Store ././@PaxHeader0000000000000000000000000000003400000000000010212 xustar0028 mtime=1738482098.7747867 h2-4.2.0/PKG-INFO0000644000076500000240000001177414747620663012515 0ustar00kriechistaffMetadata-Version: 2.2 Name: h2 Version: 4.2.0 Summary: Pure-Python HTTP/2 protocol implementation Author-email: Cory Benfield Maintainer-email: Thomas Kriechbaumer License: The MIT License (MIT) Copyright (c) 2015-2020 Cory Benfield and contributors Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Project-URL: Homepage, https://github.com/python-hyper/h2/ Project-URL: Bug Reports, https://github.com/python-hyper/h2/issues Project-URL: Source, https://github.com/python-hyper/h2/ Project-URL: Documentation, https://python-hyper.org/ Classifier: Development Status :: 5 - Production/Stable Classifier: Intended Audience :: Developers Classifier: License :: OSI Approved :: MIT License Classifier: Programming Language :: Python Classifier: Programming Language :: Python :: 3 :: Only Classifier: Programming Language :: Python :: 3 Classifier: Programming Language :: Python :: 3.9 Classifier: Programming Language :: Python :: 3.10 Classifier: Programming Language :: Python :: 3.11 Classifier: Programming Language :: Python :: 3.12 Classifier: Programming Language :: Python :: 3.13 Classifier: Programming Language :: Python :: Implementation :: CPython Classifier: Programming Language :: Python :: Implementation :: PyPy Requires-Python: >=3.9 Description-Content-Type: text/x-rst License-File: LICENSE Requires-Dist: hyperframe<7,>=6.1 Requires-Dist: hpack<5,>=4.1 ========================= h2: HTTP/2 Protocol Stack ========================= .. image:: https://github.com/python-hyper/h2/workflows/CI/badge.svg :target: https://github.com/python-hyper/h2/actions :alt: Build Status .. image:: https://codecov.io/gh/python-hyper/h2/branch/master/graph/badge.svg :target: https://codecov.io/gh/python-hyper/h2 :alt: Code Coverage .. image:: https://readthedocs.org/projects/h2/badge/?version=latest :target: https://h2.readthedocs.io/en/latest/ :alt: Documentation Status .. image:: https://img.shields.io/badge/chat-join_now-brightgreen.svg :target: https://gitter.im/python-hyper/community :alt: Chat community .. image:: https://raw.github.com/python-hyper/documentation/master/source/logo/hyper-black-bg-white.png This repository contains a pure-Python implementation of a HTTP/2 protocol stack. It's written from the ground up to be embeddable in whatever program you choose to use, ensuring that you can speak HTTP/2 regardless of your programming paradigm. You use it like this: .. code-block:: python import h2.connection import h2.config config = h2.config.H2Configuration() conn = h2.connection.H2Connection(config=config) conn.send_headers(stream_id=stream_id, headers=headers) conn.send_data(stream_id, data) socket.sendall(conn.data_to_send()) events = conn.receive_data(socket_data) This repository does not provide a parsing layer, a network layer, or any rules about concurrency. Instead, it's a purely in-memory solution, defined in terms of data actions and HTTP/2 frames. This is one building block of a full Python HTTP implementation. To install it, just run: .. code-block:: console $ python -m pip install h2 Documentation ============= Documentation is available at https://h2.readthedocs.io . Contributing ============ ``h2`` welcomes contributions from anyone! Unlike many other projects we are happy to accept cosmetic contributions and small contributions, in addition to large feature requests and changes. Before you contribute (either by opening an issue or filing a pull request), please `read the contribution guidelines`_. .. _read the contribution guidelines: http://python-hyper.org/en/latest/contributing.html License ======= ``h2`` is made available under the MIT License. For more details, see the ``LICENSE`` file in the repository. Authors ======= ``h2`` was authored by Cory Benfield and is maintained by the members of `python-hyper `_. ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1622991709.0 h2-4.2.0/README.rst0000644000076500000240000000476414057161535013100 0ustar00kriechistaff========================= h2: HTTP/2 Protocol Stack ========================= .. image:: https://github.com/python-hyper/h2/workflows/CI/badge.svg :target: https://github.com/python-hyper/h2/actions :alt: Build Status .. image:: https://codecov.io/gh/python-hyper/h2/branch/master/graph/badge.svg :target: https://codecov.io/gh/python-hyper/h2 :alt: Code Coverage .. image:: https://readthedocs.org/projects/h2/badge/?version=latest :target: https://h2.readthedocs.io/en/latest/ :alt: Documentation Status .. image:: https://img.shields.io/badge/chat-join_now-brightgreen.svg :target: https://gitter.im/python-hyper/community :alt: Chat community .. image:: https://raw.github.com/python-hyper/documentation/master/source/logo/hyper-black-bg-white.png This repository contains a pure-Python implementation of a HTTP/2 protocol stack. It's written from the ground up to be embeddable in whatever program you choose to use, ensuring that you can speak HTTP/2 regardless of your programming paradigm. You use it like this: .. code-block:: python import h2.connection import h2.config config = h2.config.H2Configuration() conn = h2.connection.H2Connection(config=config) conn.send_headers(stream_id=stream_id, headers=headers) conn.send_data(stream_id, data) socket.sendall(conn.data_to_send()) events = conn.receive_data(socket_data) This repository does not provide a parsing layer, a network layer, or any rules about concurrency. Instead, it's a purely in-memory solution, defined in terms of data actions and HTTP/2 frames. This is one building block of a full Python HTTP implementation. To install it, just run: .. code-block:: console $ python -m pip install h2 Documentation ============= Documentation is available at https://h2.readthedocs.io . Contributing ============ ``h2`` welcomes contributions from anyone! Unlike many other projects we are happy to accept cosmetic contributions and small contributions, in addition to large feature requests and changes. Before you contribute (either by opening an issue or filing a pull request), please `read the contribution guidelines`_. .. _read the contribution guidelines: http://python-hyper.org/en/latest/contributing.html License ======= ``h2`` is made available under the MIT License. For more details, see the ``LICENSE`` file in the repository. Authors ======= ``h2`` was authored by Cory Benfield and is maintained by the members of `python-hyper `_. ././@PaxHeader0000000000000000000000000000003400000000000010212 xustar0028 mtime=1738482098.7444685 h2-4.2.0/docs/0000755000076500000240000000000014747620663012336 5ustar00kriechistaff././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1596369228.0 h2-4.2.0/docs/Makefile0000644000076500000240000000117613711524514013767 0ustar00kriechistaff# Minimal makefile for Sphinx documentation # # You can set these variables from the command line, and also # from the environment for the first two. SPHINXOPTS ?= SPHINXBUILD ?= sphinx-build SOURCEDIR = source BUILDDIR = build # Put it first so that "make" without argument is like "make help". help: @$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O) .PHONY: help Makefile # Catch-all target: route all unknown targets to Sphinx using the new # "make mode" option. $(O) is meant as a shortcut for $(SPHINXOPTS). %: Makefile @$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O) ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1596369228.0 h2-4.2.0/docs/make.bat0000644000076500000240000000143713711524514013734 0ustar00kriechistaff@ECHO OFF pushd %~dp0 REM Command file for Sphinx documentation if "%SPHINXBUILD%" == "" ( set SPHINXBUILD=sphinx-build ) set SOURCEDIR=source set BUILDDIR=build if "%1" == "" goto help %SPHINXBUILD% >NUL 2>NUL if errorlevel 9009 ( echo. echo.The 'sphinx-build' command was not found. Make sure you have Sphinx echo.installed, then set the SPHINXBUILD environment variable to point echo.to the full path of the 'sphinx-build' executable. 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This is because scheduling data sends is outside the scope of this library, as it likely requires fairly substantial understanding of the scheduler being used. However, for servers that *do* want to follow the priority recommendations given by clients, the Hyper project provides `an implementation`_ of the `RFC 7540`_ priority tree that will be useful to plug into a server. That, combined with the :class:`PriorityUpdated ` event from this library, can be used to build a server that conforms to RFC 7540's recommendations for priority handling. Related Events -------------- .. versionadded:: 2.4.0 In the 2.4.0 release h2 added support for signaling "related events". These are a HTTP/2-only construct that exist because certain HTTP/2 events can occur simultaneously: that is, one HTTP/2 frame can cause multiple state transitions to occur at the same time. One example of this is a HEADERS frame that contains priority information and carries the END_STREAM flag: this would cause three events to fire (one of the various request/response received events, a :class:`PriorityUpdated ` event, and a :class:`StreamEnded ` event). Ordinarily h2's logic will emit those events to you one at a time. This means that you may attempt to process, for example, a :class:`DataReceived ` event, not knowing that the next event out will be a :class:`StreamEnded ` event. h2 *does* know this, however, and so will forbid you from taking certain actions that are a violation of the HTTP/2 protocol. To avoid this asymmetry of information, events that can occur simultaneously now carry properties for their "related events". These allow users to find the events that can have occurred simultaneously with each other before the event is emitted by h2. The following objects have "related events": - :class:`RequestReceived `: - :data:`stream_ended `: any :class:`StreamEnded ` event that occurred at the same time as receiving this request. - :data:`priority_updated `: any :class:`PriorityUpdated ` event that occurred at the same time as receiving this request. - :class:`ResponseReceived `: - :data:`stream_ended `: any :class:`StreamEnded ` event that occurred at the same time as receiving this response. - :data:`priority_updated `: any :class:`PriorityUpdated ` event that occurred at the same time as receiving this response. - :class:`TrailersReceived `: - :data:`stream_ended `: any :class:`StreamEnded ` event that occurred at the same time as receiving this set of trailers. This will **always** be present for trailers, as they must terminate streams. - :data:`priority_updated `: any :class:`PriorityUpdated ` event that occurred at the same time as receiving this response. - :class:`InformationalResponseReceived `: - :data:`priority_updated `: any :class:`PriorityUpdated ` event that occurred at the same time as receiving this informational response. - :class:`DataReceived `: - :data:`stream_ended `: any :class:`StreamEnded ` event that occurred at the same time as receiving this data. .. warning:: h2 does not know if you are looking for related events or expecting to find events in the event stream. Therefore, it will always emit "related events" in the event stream. If you are using the "related events" event pattern, you will want to be careful to avoid double-processing related events. .. _h2-connection-advanced: Connections: Advanced --------------------- Thread Safety ~~~~~~~~~~~~~ ``H2Connection`` objects are *not* thread-safe. They cannot safely be accessed from multiple threads at once. This is a deliberate design decision: it is not trivially possible to design the ``H2Connection`` object in a way that would be either lock-free or have the locks at a fine granularity. Your implementations should bear this in mind, and handle it appropriately. It should be simple enough to use locking alongside the ``H2Connection``: simply lock around the connection object itself. Because the ``H2Connection`` object does no I/O it should be entirely safe to do that. Alternatively, have a single thread take ownership of the ``H2Connection`` and use a message-passing interface to serialize access to the ``H2Connection``. If you are using a non-threaded concurrency approach (e.g. Twisted), this should not affect you. Internal Buffers ~~~~~~~~~~~~~~~~ In order to avoid doing I/O, the ``H2Connection`` employs an internal buffer. This buffer is *unbounded* in size: it can potentially grow infinitely. This means that, if you are not making sure to regularly empty it, you are at risk of exceeding the memory limit of a single process and finding your program crashes. It is highly recommended that you send data at regular intervals, ideally as soon as possible. .. _advanced-sending-data: Sending Data ~~~~~~~~~~~~ When sending data on the network, it's important to remember that you may not be able to send an unbounded amount of data at once. Particularly when using TCP, it is often the case that there are limits on how much data may be in flight at any one time. These limits can be very low, and your operating system will only buffer so much data in memory before it starts to complain. For this reason, it is possible to consume only a subset of the data available when you call :meth:`data_to_send `. However, once you have pulled the data out of the ``H2Connection`` internal buffer, it is *not* possible to put it back on again. For that reason, it is advisable that you confirm how much space is available in the OS buffer before sending. Alternatively, use tools made available by your framework. For example, the Python standard library :mod:`socket ` module provides a :meth:`sendall ` method that will automatically block until all the data has been sent. This will enable you to always use the unbounded form of :meth:`data_to_send `, and will help you avoid subtle bugs. When To Send ~~~~~~~~~~~~ In addition to knowing how much data to send (see :ref:`advanced-sending-data`) it is important to know when to send data. For h2, this amounts to knowing when to call :meth:`data_to_send `. h2 may write data into its send buffer at two times. The first is whenever :meth:`receive_data ` is called. This data is sent in response to some control frames that require no user input: for example, responding to PING frames. The second time is in response to user action: whenever a user calls a method like :meth:`send_headers `, data may be written into the buffer. In a standard design for a h2 consumer, then, that means there are two places where you'll potentially want to send data. The first is in your "receive data" loop. This is where you take the data you receive, pass it into :meth:`receive_data `, and then dispatch events. For this loop, it is usually best to save sending data until the loop is complete: that allows you to empty the buffer only once. The other place you'll want to send the data is when initiating requests or taking any other active, unprompted action on the connection. In this instance, you'll want to make all the relevant ``send_*`` calls, and *then* call :meth:`data_to_send `. Headers ------- HTTP/2 defines several "special header fields" which are used to encode data that was previously sent in either the request or status line of HTTP/1.1. These header fields are distinguished from ordinary header fields because their field name begins with a ``:`` character. The special header fields defined in `RFC 7540`_ are: - ``:status`` - ``:path`` - ``:method`` - ``:scheme`` - ``:authority`` `RFC 7540`_ **mandates** that all of these header fields appear *first* in the header block, before the ordinary header fields. This could cause difficulty if the :meth:`send_headers ` method accepted a plain ``dict`` for the ``headers`` argument, because ``dict`` objects are unordered. For this reason, we require that you provide a list of two-tuples. .. _RFC 7540: https://tools.ietf.org/html/rfc7540 .. _an implementation: http://python-hyper.org/projects/priority/en/latest/ Flow Control ------------ HTTP/2 defines a complex flow control system that uses a sliding window of data on both a per-stream and per-connection basis. Essentially, each implementation allows its peer to send a specific amount of data at any time (the "flow control window") before it must stop. Each stream has a separate window, and the connection as a whole has a window. Each window can be opened by an implementation by sending a ``WINDOW_UPDATE`` frame, either on a specific stream (causing the window for that stream to be opened), or on stream ``0``, which causes the window for the entire connection to be opened. In HTTP/2, only data in ``DATA`` frames is flow controlled. All other frames are exempt from flow control. Each ``DATA`` frame consumes both stream and connection flow control window bytes. This means that the maximum amount of data that can be sent on any one stream before a ``WINDOW_UPDATE`` frame is received is the *lower* of the stream and connection windows. The maximum amount of data that can be sent on *all* streams before a ``WINDOW_UPDATE`` frame is received is the size of the connection flow control window. Working With Flow Control ~~~~~~~~~~~~~~~~~~~~~~~~~ The amount of flow control window a ``DATA`` frame consumes is the sum of both its contained application data *and* the amount of padding used. h2 shows this to the user in a :class:`DataReceived ` event by using the :data:`flow_controlled_length ` field. When working with flow control in h2, users *must* use this field: simply using ``len(datareceived.data)`` can eventually lead to deadlock. When data has been received and given to the user in a :class:`DataReceived `, it is the responsibility of the user to re-open the flow control window when the user is ready for more data. h2 does not do this automatically to avoid flooding the user with data: if we did, the remote peer could send unbounded amounts of data that the user would need to buffer before processing. To re-open the flow control window, then, the user must call :meth:`increment_flow_control_window ` with the :data:`flow_controlled_length ` of the received data. h2 requires that you manage both the connection and the stream flow control windows separately, so you may need to increment both the stream the data was received on and stream ``0``. When sending data, a HTTP/2 implementation must not send more than flow control window available for that stream. As noted above, the maximum amount of data that can be sent on the stream is the minimum of the stream and the connection flow control windows. You can find out how much data you can send on a given stream by using the :meth:`local_flow_control_window ` method, which will do all of these calculations for you. If you attempt to send more than this amount of data on a stream, h2 will throw a :class:`ProtocolError ` and refuse to send the data. In h2, receiving a ``WINDOW_UPDATE`` frame causes a :class:`WindowUpdated ` event to fire. This will notify you that there is potentially more room in a flow control window. Note that, just because an increment of a given size was received *does not* mean that that much more data can be sent: remember that both the connection and stream flow control windows constrain how much data can be sent. As a result, when a :class:`WindowUpdated ` event fires with a non-zero stream ID, and the user has more data to send on that stream, the user should call :meth:`local_flow_control_window ` to check if there really is more room to send data on that stream. When a :class:`WindowUpdated ` event fires with a stream ID of ``0``, that may have unblocked *all* streams that are currently blocked. The user should use :meth:`local_flow_control_window ` to check all blocked streams to see if more data is available. Auto Flow Control ~~~~~~~~~~~~~~~~~ .. versionadded:: 2.5.0 In most cases, there is no advantage for users in managing their own flow control strategies. While particular high performance or specific-use-case applications may gain value from directly controlling the emission of ``WINDOW_UPDATE`` frames, the average application can use a lowest-common-denominator strategy to emit those frames. As of version 2.5.0, h2 now provides this automatic strategy for users, if they want to use it. This automatic strategy is built around a single method: :meth:`acknowledge_received_data `. This method flags to the connection object that your application has dealt with a certain number of flow controlled bytes, and that the window should be incremented in some way. Whenever your application has "processed" some received bytes, this method should be called to signal that they have been processed. The key difference between this method and :meth:`increment_flow_control_window ` is that the method :meth:`acknowledge_received_data ` does not guarantee that it will emit a ``WINDOW_UPDATE`` frame, and if it does it will not necessarily emit them for *only* the stream or *only* the frame. Instead, the ``WINDOW_UPDATE`` frames will be *coalesced*: they will be emitted only when a certain number of bytes have been freed up. For most applications, this method should be preferred to the manual flow control mechanism. ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1618664999.0 h2-4.2.0/docs/source/api.rst0000644000076500000240000000614214036557047015140 0ustar00kriechistaffh2 API ====== This document details the API of h2. Semantic Versioning ------------------- h2 follows semantic versioning for its public API. Please note that the guarantees of semantic versioning apply only to the API that is *documented here*. Simply because a method or data field is not prefaced by an underscore does not make it part of h2's public API. Anything not documented here is subject to change at any time. Connection ---------- .. autoclass:: h2.connection.H2Connection :members: :exclude-members: inbound_flow_control_window Configuration ------------- .. autoclass:: h2.config.H2Configuration :members: .. _h2-events-api: Events ------ .. autoclass:: h2.events.RequestReceived :members: .. autoclass:: h2.events.ResponseReceived :members: .. autoclass:: h2.events.TrailersReceived :members: .. autoclass:: h2.events.InformationalResponseReceived :members: .. autoclass:: h2.events.DataReceived :members: .. autoclass:: h2.events.WindowUpdated :members: .. autoclass:: h2.events.RemoteSettingsChanged :members: .. autoclass:: h2.events.PingReceived :members: .. autoclass:: h2.events.PingAckReceived :members: .. autoclass:: h2.events.StreamEnded :members: .. autoclass:: h2.events.StreamReset :members: .. autoclass:: h2.events.PushedStreamReceived :members: .. autoclass:: h2.events.SettingsAcknowledged :members: .. autoclass:: h2.events.PriorityUpdated :members: .. autoclass:: h2.events.ConnectionTerminated :members: .. autoclass:: h2.events.AlternativeServiceAvailable :members: .. autoclass:: h2.events.UnknownFrameReceived :members: Exceptions ---------- .. autoclass:: h2.exceptions.H2Error :members: .. autoclass:: h2.exceptions.NoSuchStreamError :show-inheritance: :members: .. autoclass:: h2.exceptions.StreamClosedError :show-inheritance: :members: .. autoclass:: h2.exceptions.RFC1122Error :show-inheritance: :members: Protocol Errors ~~~~~~~~~~~~~~~ .. autoclass:: h2.exceptions.ProtocolError :show-inheritance: :members: .. autoclass:: h2.exceptions.FrameTooLargeError :show-inheritance: :members: .. autoclass:: h2.exceptions.FrameDataMissingError :show-inheritance: :members: .. autoclass:: h2.exceptions.TooManyStreamsError :show-inheritance: :members: .. autoclass:: h2.exceptions.FlowControlError :show-inheritance: :members: .. autoclass:: h2.exceptions.StreamIDTooLowError :show-inheritance: :members: .. autoclass:: h2.exceptions.InvalidSettingsValueError :members: .. autoclass:: h2.exceptions.NoAvailableStreamIDError :show-inheritance: :members: .. autoclass:: h2.exceptions.InvalidBodyLengthError :show-inheritance: :members: .. autoclass:: h2.exceptions.UnsupportedFrameError :members: .. autoclass:: h2.exceptions.DenialOfServiceError :show-inheritance: :members: HTTP/2 Error Codes ------------------ .. automodule:: h2.errors :members: Settings -------- .. autoclass:: h2.settings.SettingCodes :members: .. autoclass:: h2.settings.Settings :inherited-members: .. autoclass:: h2.settings.ChangedSetting :members: ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737582431.0 h2-4.2.0/docs/source/asyncio-example.rst0000644000076500000240000000151014744263537017463 0ustar00kriechistaffAsyncio Example Server ====================== This example is a basic HTTP/2 server written using `asyncio`_, using some functionality that was introduced in Python 3.5. This server represents basically just the same JSON-headers-returning server that was built in the :doc:`basic-usage` document. This example demonstrates some basic asyncio techniques. .. literalinclude:: ../../examples/asyncio/asyncio-server.py :language: python :linenos: :encoding: utf-8 You can use ``cert.crt`` and ``cert.key`` files provided within the repository or generate your own certificates using `OpenSSL`_: .. code-block:: console $ openssl req -x509 -newkey rsa:2048 -keyout cert.key -out cert.crt -days 365 -nodes .. _asyncio: https://docs.python.org/3/library/asyncio.html .. _OpenSSL: https://openssl-library.org/source/index.html././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737582431.0 h2-4.2.0/docs/source/basic-usage.rst0000644000076500000240000007121014744263537016554 0ustar00kriechistaffGetting Started: Writing Your Own HTTP/2 Server =============================================== This document explains how to get started writing fully-fledged HTTP/2 implementations using h2 as the underlying protocol stack. It covers the basic concepts you need to understand, and talks you through writing a very simple HTTP/2 server. This document assumes you're moderately familiar with writing Python, and have *some* understanding of how computer networks work. If you don't, you'll find it a lot easier if you get some understanding of those concepts first and then return to this documentation. .. _h2-connection-basic: Connections ----------- h2's core object is the :class:`H2Connection ` object. This object is an abstract representation of the state of a single HTTP/2 connection, and holds all the important protocol state. When using h2, this object will be the first thing you create and the object that does most of the heavy lifting. The interface to this object is relatively simple. For sending data, you call the object with methods indicating what actions you want to perform: for example, you may want to send headers (you'd use the :meth:`send_headers ` method), or send data (you'd use the :meth:`send_data ` method). After you've decided what actions you want to perform, you get some bytes out of the object that represent the HTTP/2-encoded representation of your actions, and send them out over the network however you see fit. When you receive data from the network, you pass that data in to the ``H2Connection`` object, which returns a list of *events*. These events, covered in more detail later in :ref:`h2-events-basic`, define the set of actions the remote peer has performed on the connection, as represented by the HTTP/2-encoded data you just passed to the object. Thus, you end up with a simple loop (which you may recognise as a more-specific form of an `event loop`_): 1. First, you perform some actions. 2. You send the data created by performing those actions to the network. 3. You read data from the network. 4. You decode those into events. 5. The events cause you to trigger some actions: go back to step 1. Of course, HTTP/2 is more complex than that, but in the very simplest case you can write a fairly effective HTTP/2 tool using just that kind of loop. Later in this document, we'll do just that. Some important subtleties of ``H2Connection`` objects are covered in :doc:`advanced-usage`: see :ref:`h2-connection-advanced` for more information. However, one subtlety should be covered, and that is this: h2's ``H2Connection`` object doesn't do I/O. Let's talk briefly about why. I/O ~~~ Any useful HTTP/2 tool eventually needs to do I/O. This is because it's not very useful to be able to speak to other computers using a protocol like HTTP/2 unless you actually *speak* to them sometimes. However, doing I/O is not a trivial thing: there are lots of different ways to do it, and once you choose a way to do it your code usually won't work well with the approaches you *didn't* choose. While there are lots of different ways to do I/O, when it comes down to it all HTTP/2 implementations transform bytes received into events, and events into bytes to send. So there's no reason to have lots of different versions of this core protocol code: one for Twisted, one for gevent, one for threading, and one for synchronous code. This is why we said at the top that h2 is a *HTTP/2 Protocol Stack*, not a *fully-fledged implementation*. h2 knows how to transform bytes into events and back, but that's it. The I/O and smarts might be different, but the core HTTP/2 logic is the same: that's what h2 provides. Not doing I/O makes h2 general, and also relatively simple. It has an easy-to-understand performance envelope, it's easy to test (and as a result easy to get correct behaviour out of), and it behaves in a reproducible way. These are all great traits to have in a library that is doing something quite complex. This document will talk you through how to build a relatively simple HTTP/2 implementation using h2, to give you an understanding of where it fits in your software. .. _h2-events-basic: Events ------ When writing a HTTP/2 implementation it's important to know what the remote peer is doing: if you didn't care, writing networked programs would be a lot easier! h2 encodes the actions of the remote peer in the form of *events*. When you receive data from the remote peer and pass it into your ``H2Connection`` object (see :ref:`h2-connection-basic`), the ``H2Connection`` returns a list of objects, each one representing a single event that has occurred. Each event refers to a single action the remote peer has taken. Some events are fairly high-level, referring to things that are more general than HTTP/2: for example, the :class:`RequestReceived ` event is a general HTTP concept, not just a HTTP/2 one. Other events are extremely HTTP/2-specific: for example, :class:`PushedStreamReceived ` refers to Server Push, a very HTTP/2-specific concept. The reason these events exist is that h2 is intended to be very general. This means that, in many cases, h2 does not know exactly what to do in response to an event. Your code will need to handle these events, and make decisions about what to do. That's the major role of any HTTP/2 implementation built on top of h2. A full list of events is available in :ref:`h2-events-api`. For the purposes of this example, we will handle only a small set of events. Writing Your Server ------------------- Armed with the knowledge you just obtained, we're going to write a very simple HTTP/2 web server. The goal of this tutorial is to write a server that can handle a HTTP GET, and that returns the headers sent by the client, encoded in JSON. Basically, something a lot like `httpbin.org/get`_. Nothing fancy, but this is a good way to get a handle on how you should interact with h2. For the sake of simplicity, we're going to write this using the Python standard library, in Python 3. In reality, you'll probably want to use an asynchronous framework of some kind: see the `examples directory`_ in the repository for some examples of how you'd do that. Before we start, create a new file called ``h2server.py``: we'll use that as our workspace. Additionally, you should install h2: follow the instructions in :doc:`installation`. Step 1: Sockets ~~~~~~~~~~~~~~~ To begin with, we need to make sure we can listen for incoming data and send it back. To do that, we need to use the `standard library's socket module`_. For now we're going to skip doing TLS: if you want to reach your server from your web browser, though, you'll need to add TLS and some other function. Consider looking at our examples in our `examples directory`_ instead. Let's begin. First, open up ``h2server.py``. We need to import the socket module and start listening for connections. This is not a socket tutorial, so we're not going to dive too deeply into how this works. If you want more detail about sockets, there are lots of good tutorials on the web that you should investigate. When you want to listen for incoming connections, you need to *bind* an address first. So let's do that. Try setting up your file to look like this: .. code-block:: python import socket sock = socket.socket() sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) sock.bind(('0.0.0.0', 8080)) sock.listen(5) while True: print(sock.accept()) In a shell window, execute this program (``python h2server.py``). Then, open another shell and run ``curl http://localhost:8080/``. In the first shell, you should see something like this: .. code-block:: console $ python h2server.py (, ('127.0.0.1', 58800)) Run that ``curl`` command a few more times. You should see a few more similar lines appear. Note that the ``curl`` command itself will exit with an error. That's fine: it happens because we didn't send any data. Now go ahead and stop the server running by hitting Ctrl+C in the first shell. You should see a ``KeyboardInterrupt`` error take the process down. What's the program above doing? Well, first it creates a :func:`socket ` object. This socket is then *bound* to a specific address: ``('0.0.0.0', 8080)``. This is a special address: it means that this socket should be listening for any traffic to TCP port 8080. Don't worry about the call to ``setsockopt``: it just makes sure you can run this program repeatedly. We then loop forever calling the :meth:`accept ` method on the socket. The accept method blocks until someone attempts to connect to our TCP port: when they do, it returns a tuple: the first element is a new socket object, the second element is a tuple of the address the new connection is from. You can see this in the output from our ``h2server.py`` script. At this point, we have a script that can accept inbound connections. This is a good start! Let's start getting HTTP/2 involved. Step 2: Add a H2Connection ~~~~~~~~~~~~~~~~~~~~~~~~~~ Now that we can listen for socket information, we want to prepare our HTTP/2 connection object and start handing it data. For now, let's just see what happens as we feed it data. To make HTTP/2 connections, we need a tool that knows how to speak HTTP/2. You can simply use `curl`_ or any other client with HTTP/2 support like `httpx`_. To confirm that it works, try running this command and verifying that the output looks similar to the one shown below: .. code-block:: console $ curl --http2 https://nghttp2.org/httpbin/get {'args': {}, 'headers': {'Host': 'nghttp2.org'}, 'origin': '10.0.0.2', 'url': 'https://nghttp2.org/httpbin/get'} To use it with our server though, you will need to invoke it with a different ``--http2-prior-knowledge`` flag as we are going to serve over the insecure connection. Assuming it works, you're now ready to start sending HTTP/2 data. Back in our ``h2server.py`` script, we're going to want to start handling data. Let's add a function that takes a socket returned from ``accept``, and reads data from it. Let's call that function ``handle``. That function should create a :class:`H2Connection ` object and then loop on the socket, reading data and passing it to the connection. To read data from a socket we need to call ``recv``. The ``recv`` function takes a number as its argument, which is the *maximum* amount of data to be returned from a single call (note that ``recv`` will return as soon as any data is available, even if that amount is vastly less than the number you passed to it). For the purposes of writing this kind of software the specific value is not enormously useful, but should not be overly large. For that reason, when you're unsure, a number like 4096 or 65535 is a good bet. We'll use 65535 for this example. The function should look something like this: .. code-block:: python import h2.connection import h2.config def handle(sock): config = h2.config.H2Configuration(client_side=False) conn = h2.connection.H2Connection(config=config) while True: data = sock.recv(65535) print(conn.receive_data(data)) Let's update our main loop so that it passes data on to our new data handling function. Your ``h2server.py`` should end up looking a like this: .. code-block:: python import socket import h2.connection import h2.config def handle(sock): config = h2.config.H2Configuration(client_side=False) conn = h2.connection.H2Connection(config=config) while True: data = sock.recv(65535) if not data: break print(conn.receive_data(data)) sock = socket.socket() sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) sock.bind(('0.0.0.0', 8080)) sock.listen(5) while True: handle(sock.accept()[0]) Running that in one shell, in your other shell you can run ``curl -v --http2-prior-knowledge http://localhost:8080/`` command. That shell should hang, and you should then see the following output from your ``h2server.py`` shell: .. code-block:: console $ python h2server.py [] You'll then need to kill ``curl`` and ``h2server.py`` with Ctrl+C. Feel free to do this a few times, to see how things behave. So, what did we see here? When the connection was opened, we used the :meth:`recv ` method to read some data from the socket, in a loop. We then passed that data to the connection object, which returned us a single event object: :class:`RemoteSettingsChanged `. But what we didn't see was anything else. So it seems like all ``curl`` did was change its settings, but nothing else. If you look at the other ``curl`` window, you'll notice that it hangs for a while and then eventually fails with a socket timeout. It was waiting for something: what? Well, it turns out that at the start of a connection, both sides need to send a bit of data, called "the HTTP/2 preamble". We don't need to get into too much detail here, but basically both sides need to send a single block of HTTP/2 data that tells the other side what their settings are. ``curl`` did that, but we didn't. Let's do that next. Step 3: Sending the Preamble ~~~~~~~~~~~~~~~~~~~~~~~~~~~~ h2 makes doing connection setup really easy. All you need to do is call the :meth:`initiate_connection ` method, and then send the corresponding data. Let's update our ``handle`` function to do just that: .. code-block:: python def handle(sock): config = h2.config.H2Configuration(client_side=False) conn = h2.connection.H2Connection(config=config) conn.initiate_connection() sock.sendall(conn.data_to_send()) while True: data = sock.recv(65535) print(conn.receive_data(data)) The big change here is the call to ``initiate_connection``, but there's another new method in there: :meth:`data_to_send `. When you make function calls on your ``H2Connection`` object, these will often want to cause HTTP/2 data to be written out to the network. But h2 doesn't do any I/O, so it can't do that itself. Instead, it writes it to an internal buffer. You can retrieve data from this buffer using the ``data_to_send`` method. There are some subtleties about that method, but we don't need to worry about them right now: all we need to do is make sure we're sending whatever data is outstanding. Your ``h2server.py`` script should now look like this: .. code-block:: python import socket import h2.connection import h2.config def handle(sock): config = h2.config.H2Configuration(client_side=False) conn = h2.connection.H2Connection(config=config) conn.initiate_connection() sock.sendall(conn.data_to_send()) while True: data = sock.recv(65535) if not data: break print(conn.receive_data(data)) sock = socket.socket() sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) sock.bind(('0.0.0.0', 8080)) sock.listen(5) while True: handle(sock.accept()[0]) With this change made, rerun your ``h2server.py`` script and hit it with the same ``curl`` command: ``curl -v --http2-prior-knowledge http://localhost:8080/``. The ``curl`` command still hangs, but this time we get a bit more output from our ``h2server.py`` script: .. code-block:: console $ python h2server.py [] [] [, ] So, what's happening? The first thing to note is that we're going around our loop more than once now. First, we receive some data that triggers a :class:`RemoteSettingsChanged ` event. Then, we get some more data that triggers a :class:`SettingsAcknowledged ` event. Finally, even more data that triggers *two* events: :class:`RequestReceived ` and :class:`StreamEnded `. So, what's happening is that ``curl`` is telling us about its settings, acknowledging ours, and then sending us a request. Then it ends a *stream*, which is a HTTP/2 communications channel that holds a request and response pair. A stream isn't done until it's either *reset* or both sides *close* it: in this sense it's bi-directional. So what the ``StreamEnded`` event tells us is that ``curl`` is closing its half of the stream: it won't send us any more data on that stream. That means the request is done. So why is ``curl`` hanging? Well, we haven't sent a response yet: let's do that. Step 4: Handling Events ~~~~~~~~~~~~~~~~~~~~~~~ What we want to do is send a response when we receive a request. Happily, we get an event when we receive a request, so we can use that to be our signal. Let's define a new function that sends a response. For now, this response can just be a little bit of data that prints "it works!". The function should take the ``H2Connection`` object, and the event that signaled the request. Let's define it. .. code-block:: python def send_response(conn, event): stream_id = event.stream_id conn.send_headers( stream_id=stream_id, headers=[ (':status', '200'), ('server', 'basic-h2-server/1.0') ], ) conn.send_data( stream_id=stream_id, data=b'it works!', end_stream=True ) So while this is only a short function, there's quite a lot going on here we need to unpack. Firstly, what's a stream ID? Earlier we discussed streams briefly, to say that they're a bi-directional communications channel that holds a request and response pair. Part of what makes HTTP/2 great is that there can be lots of streams going on at once, sending and receiving different requests and responses. To identify each stream, we use a *stream ID*. These are unique across the lifetime of a connection, and they go in ascending order. Most ``H2Connection`` functions take a stream ID: they require you to actively tell the connection which one to use. In this case, as a simple server, we will never need to choose a stream ID ourselves: the client will always choose one for us. That means we'll always be able to get the one we need off the events that fire. Next, we send some *headers*. In HTTP/2, a response is made up of some set of headers, and optionally some data. The headers have to come first: if you're a client then you'll be sending *request* headers, but in our case these headers are our *response* headers. Mostly these aren't very exciting, but you'll notice once special header in there: ``:status``. This is a HTTP/2-specific header, and it's used to hold the HTTP status code that used to go at the top of a HTTP response. Here, we're saying the response is ``200 OK``, which is successful. To send headers in h2, you use the :meth:`send_headers ` function. Next, we want to send the body data. To do that, we use the :meth:`send_data ` function. This also takes a stream ID. Note that the data is binary: h2 does not work with unicode strings, so you *must* pass bytestrings to the ``H2Connection``. The one exception is headers: h2 will automatically encode those into UTF-8. The last thing to note is that on our call to ``send_data``, we set ``end_stream`` to ``True``. This tells h2 (and the remote peer) that we're done with sending data: the response is over. Because we know that ``curl`` will have ended its side of the stream, when we end ours the stream will be totally done with. We're nearly ready to go with this: we just need to plumb this function in. Let's amend our ``handle`` function again: .. code-block:: python import h2.events import h2.config def handle(sock): config = h2.config.H2Configuration(client_side=False) conn = h2.connection.H2Connection(config=config) conn.initiate_connection() sock.sendall(conn.data_to_send()) while True: data = sock.recv(65535) if not data: break events = conn.receive_data(data) for event in events: if isinstance(event, h2.events.RequestReceived): send_response(conn, event) data_to_send = conn.data_to_send() if data_to_send: sock.sendall(data_to_send) The changes here are all at the end. Now, when we receive some events, we look through them for the ``RequestReceived`` event. If we find it, we make sure we send a response. Then, at the bottom of the loop we check whether we have any data to send, and if we do, we send it. Then, we repeat again. With these changes, your ``h2server.py`` file should look like this: .. code-block:: python import socket import h2.connection import h2.events import h2.config def send_response(conn, event): stream_id = event.stream_id conn.send_headers( stream_id=stream_id, headers=[ (':status', '200'), ('server', 'basic-h2-server/1.0') ], ) conn.send_data( stream_id=stream_id, data=b'it works!', end_stream=True ) def handle(sock): config = h2.config.H2Configuration(client_side=False) conn = h2.connection.H2Connection(config=config) conn.initiate_connection() sock.sendall(conn.data_to_send()) while True: data = sock.recv(65535) if not data: break events = conn.receive_data(data) for event in events: if isinstance(event, h2.events.RequestReceived): send_response(conn, event) data_to_send = conn.data_to_send() if data_to_send: sock.sendall(data_to_send) sock = socket.socket() sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) sock.bind(('0.0.0.0', 8080)) sock.listen(5) while True: handle(sock.accept()[0]) Alright. Let's run this, and then run our ``curl`` command again. This time, nothing is printed from our server, and the ``curl`` side prints ``it works!``. Success! Try running it a few more times, and we can see that not only does it work the first time, it works the other times too! We can speak HTTP/2! Let's add the final step: returning the JSON-encoded request headers. Step 5: Returning Headers ~~~~~~~~~~~~~~~~~~~~~~~~~ If we want to return the request headers in JSON, the first thing we have to do is find them. Handily, if you check the documentation for :class:`RequestReceived ` you'll find that this event carries, in addition to the stream ID, the request headers. This means we can make a really simple change to our ``send_response`` function to take those headers and encode them as a JSON object. Let's do that: .. code-block:: python import json def send_response(conn, event): stream_id = event.stream_id response_data = json.dumps(dict(event.headers)).encode('utf-8') conn.send_headers( stream_id=stream_id, headers=[ (':status', '200'), ('server', 'basic-h2-server/1.0'), ('content-length', str(len(response_data))), ('content-type', 'application/json'), ], ) conn.send_data( stream_id=stream_id, data=response_data, end_stream=True ) This is a really simple change, but it's all we need to do: a few extra headers and the JSON dump, but that's it. Section 6: Bringing It All Together ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ This should be all we need! Let's take all the work we just did and throw that into our ``h2server.py`` file, which should now look like this: .. code-block:: python import json import socket import h2.connection import h2.events import h2.config def send_response(conn, event): stream_id = event.stream_id response_data = json.dumps(dict(event.headers)).encode('utf-8') conn.send_headers( stream_id=stream_id, headers=[ (':status', '200'), ('server', 'basic-h2-server/1.0'), ('content-length', str(len(response_data))), ('content-type', 'application/json'), ], ) conn.send_data( stream_id=stream_id, data=response_data, end_stream=True ) def handle(sock): config = h2.config.H2Configuration(client_side=False) conn = h2.connection.H2Connection(config=config) conn.initiate_connection() sock.sendall(conn.data_to_send()) while True: data = sock.recv(65535) if not data: break events = conn.receive_data(data) for event in events: if isinstance(event, h2.events.RequestReceived): send_response(conn, event) data_to_send = conn.data_to_send() if data_to_send: sock.sendall(data_to_send) sock = socket.socket() sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) sock.bind(('0.0.0.0', 8080)) sock.listen(5) while True: handle(sock.accept()[0]) Now, execute ``h2server.py`` and then point ``curl`` at it again. You should see something like the following output from ``curl``: .. code-block:: console $ curl -v --http2-prior-knowledge http://localhost:8080/ {":scheme": "http", ":authority": "localhost", ":method": "GET", ":path": "/"} Here you can see the HTTP/2 request 'special headers' that ``curl`` sends. These are similar to the ``:status`` header we have to send on our response: they encode important parts of the HTTP request in a clearly-defined way. If you were writing a client stack using h2, you'd need to make sure you were sending those headers. Congratulations! ~~~~~~~~~~~~~~~~ Congratulations! You've written your first HTTP/2 server! If you want to extend it, there are a few directions you could investigate: - We didn't handle a few events that we saw were being raised: you could add some methods to handle those appropriately. - Right now our server is single threaded, so it can only handle one client at a time. Consider rewriting this server to use threads, or writing this server again using your favourite asynchronous programming framework. If you plan to use threads, you should know that a ``H2Connection`` object is deliberately not thread-safe. As a possible design pattern, consider creating threads and passing the sockets returned by ``accept`` to those threads, and then letting those threads create their own ``H2Connection`` objects. - Take a look at some of our long-form code examples in :doc:`examples`. - Alternatively, try playing around with our examples in our repository's `examples directory`_. These examples are a bit more fully-featured, and can be reached from your web browser. Try adjusting what they do, or adding new features to them! - You may want to make this server reachable from your web browser. To do that, you'll need to add proper TLS support to your server. This can be tricky, and in many cases requires `PyOpenSSL`_ in addition to the other libraries you have installed. Check the `Eventlet example`_ to see what PyOpenSSL code is required to TLS-ify your server. .. _event loop: https://en.wikipedia.org/wiki/Event_loop .. _httpbin.org/get: https://httpbin.org/get .. _examples directory: https://github.com/python-hyper/h2/tree/master/examples .. _standard library's socket module: https://docs.python.org/3/library/socket.html .. _Application Layer Protocol Negotiation: https://en.wikipedia.org/wiki/Application-Layer_Protocol_Negotiation .. _get your certificate here: https://raw.githubusercontent.com/python-hyper/h2/master/examples/twisted/server.crt .. _get your private key here: https://raw.githubusercontent.com/python-hyper/h2/master/examples/twisted/server.key .. _PyOpenSSL: http://pyopenssl.readthedocs.org/ .. _Eventlet example: https://github.com/python-hyper/h2/blob/master/examples/eventlet/eventlet-server.py .. _curl: https://curl.se/docs/http2.html .. _httpx: https://www.python-httpx.org/././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1596371586.0 h2-4.2.0/docs/source/conf.py0000644000076500000240000000475113711531202015120 0ustar00kriechistaff# Configuration file for the Sphinx documentation builder. # # This file only contains a selection of the most common options. For a full # list see the documentation: # https://www.sphinx-doc.org/en/master/usage/configuration.html # -- Path setup -------------------------------------------------------------- # If extensions (or modules to document with autodoc) are in another directory, # add these directories to sys.path here. If the directory is relative to the # documentation root, use os.path.abspath to make it absolute, like shown here. # import os import sys import re sys.path.insert(0, os.path.abspath('../..')) PROJECT_ROOT = os.path.dirname(__file__) # Get the version version_regex = r'__version__ = ["\']([^"\']*)["\']' with open(os.path.join(PROJECT_ROOT, '../../', 'src/h2/__init__.py')) as file_: text = file_.read() match = re.search(version_regex, text) version = match.group(1) # -- Project information ----------------------------------------------------- project = 'hyper-h2' copyright = '2020, Cory Benfield' author = 'Cory Benfield' release = version # -- General configuration --------------------------------------------------- # Add any Sphinx extension module names here, as strings. They can be # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom # ones. extensions = [ 'sphinx.ext.autodoc', 'sphinx.ext.intersphinx', 'sphinx.ext.viewcode', ] # Add any paths that contain templates here, relative to this directory. templates_path = ['_templates'] # List of patterns, relative to source directory, that match files and # directories to ignore when looking for source files. # This pattern also affects html_static_path and html_extra_path. exclude_patterns = [] # Example configuration for intersphinx: refer to the Python standard library. intersphinx_mapping = { 'python': ('https://docs.python.org/', None), 'hpack': ('https://hpack.readthedocs.io/en/stable/', None), 'pyopenssl': ('https://pyopenssl.readthedocs.org/en/latest/', None), } master_doc = 'index' # -- Options for HTML output ------------------------------------------------- # The theme to use for HTML and HTML Help pages. See the documentation for # a list of builtin themes. # html_theme = 'default' # Add any paths that contain custom static files (such as style sheets) here, # relative to this directory. They are copied after the builtin static files, # so a file named "default.css" will overwrite the builtin "default.css". html_static_path = ['_static'] ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1618664999.0 h2-4.2.0/docs/source/curio-example.rst0000644000076500000240000000103214036557047017132 0ustar00kriechistaffCurio Example Server ==================== This example is a basic HTTP/2 server written using `curio`_, David Beazley's example of how to build a concurrent networking framework using Python 3.5's new ``async``/``await`` syntax. This example is notable for demonstrating the correct use of HTTP/2 flow control with h2. It is also a good example of the brand new syntax. .. literalinclude:: ../../examples/curio/curio-server.py :language: python :linenos: :encoding: utf-8 .. _curio: https://curio.readthedocs.org/en/latest/ ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1596369288.0 h2-4.2.0/docs/source/eventlet-example.rst0000644000076500000240000000127013711524610017630 0ustar00kriechistaffEventlet Example Server ======================= This example is a basic HTTP/2 server written using the `eventlet`_ concurrent networking framework. This example is notable for demonstrating how to configure `PyOpenSSL`_, which `eventlet`_ uses for its TLS layer. In terms of HTTP/2 functionality, this example is very simple: it returns the request headers as a JSON document to the caller. It does not obey HTTP/2 flow control, which is a flaw, but it is otherwise functional. .. literalinclude:: ../../examples/eventlet/eventlet-server.py :language: python :linenos: :encoding: utf-8 .. _eventlet: http://eventlet.net/ .. _PyOpenSSL: https://pyopenssl.readthedocs.org/en/stable/ ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1631462011.0 h2-4.2.0/docs/source/examples.rst0000644000076500000240000000107014117421173016166 0ustar00kriechistaffCode Examples ============= This section of the documentation contains long-form code examples. These are intended as references for developers that would like to get an understanding of how h2 fits in with various Python I/O frameworks. Example Servers --------------- .. toctree:: :maxdepth: 2 asyncio-example curio-example eventlet-example gevent-example tornado-example twisted-example wsgi-example Example Clients --------------- .. toctree:: :maxdepth: 2 plain-sockets-example twisted-head-example twisted-post-example ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1618664999.0 h2-4.2.0/docs/source/gevent-example.rst0000644000076500000240000000130314036557047017302 0ustar00kriechistaffGevent Example Server ===================== This example is a basic HTTP/2 server written using `gevent`_, a powerful coroutine-based Python networking library that uses `greenlet`_ to provide a high-level synchronous API on top of the `libev`_ or `libuv`_ event loop. This example is inspired by the curio one and also demonstrates the correct use of HTTP/2 flow control with h2 and how gevent can be simple to use. .. literalinclude:: ../../examples/gevent/gevent-server.py :language: python :linenos: :encoding: utf-8 .. _gevent: http://www.gevent.org/ .. _greenlet: https://greenlet.readthedocs.io/en/latest/ .. _libev: http://software.schmorp.de/pkg/libev.html .. _libuv: http://libuv.org/././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1618664999.0 h2-4.2.0/docs/source/index.rst0000644000076500000240000000230714036557047015475 0ustar00kriechistaff.. hyper-h2 documentation master file, created by sphinx-quickstart on Thu Sep 17 10:06:02 2015. You can adapt this file completely to your liking, but it should at least contain the root `toctree` directive. h2: A pure-Python HTTP/2 protocol stack ======================================= h2 is a HTTP/2 protocol stack, written entirely in Python. The goal of h2 is to be a common HTTP/2 stack for the Python ecosystem, usable in all programs regardless of concurrency model or environment. To achieve this, h2 is entirely self-contained: it does no I/O of any kind, leaving that up to a wrapper library to control. This ensures that it can seamlessly work in all kinds of environments, from single-threaded code to Twisted. Its goal is to be 100% compatible with RFC 7540, implementing a complete HTTP/2 protocol stack build on a set of finite state machines. Its secondary goals are to be fast, clear, and efficient. For usage examples, see :doc:`basic-usage` or consult the examples in the repository. Contents -------- .. toctree:: :maxdepth: 2 installation basic-usage negotiating-http2 examples advanced-usage low-level api testimonials release-process release-notes ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1618664999.0 h2-4.2.0/docs/source/installation.rst0000644000076500000240000000072114036557047017065 0ustar00kriechistaffInstallation ============ h2 is a pure-python project. This means installing it is extremely simple. To get the latest release from PyPI, simply run: .. code-block:: console $ python -m pip install h2 Alternatively, feel free to download one of the release tarballs from `our GitHub page`_, extract it to your favourite directory, and then run .. code-block:: console $ python setup.py install .. _our GitHub page: https://github.com/python-hyper/h2 ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1618664999.0 h2-4.2.0/docs/source/low-level.rst0000644000076500000240000001754014036557047016301 0ustar00kriechistaffLow-Level Details ================= .. warning:: This section of the documentation covers low-level implementation details of h2. This is most likely to be of use to h2 developers and to other HTTP/2 implementers, though it could well be of general interest. Feel free to peruse it, but if you're looking for information about how to *use* h2 you should consider looking elsewhere. State Machines -------------- h2 is fundamentally built on top of a pair of interacting Finite State Machines. One of these FSMs manages per-connection state, and another manages per-stream state. Almost without exception (see :ref:`priority` for more details) every single frame is unconditionally translated into events for both state machines and those state machines are turned. The advantages of a system such as this is that the finite state machines can very densely encode the kinds of things that are allowed at any particular moment in a HTTP/2 connection. However, most importantly, almost all protocols are defined *in terms* of finite state machines: that is, protocol descriptions can be reduced to a number of states and inputs. That makes FSMs a very natural tool for implementing protocol stacks. Indeed, most protocol implementations that do not explicitly encode a finite state machine almost always *implicitly* encode a finite state machine, by using classes with a bunch of variables that amount to state-tracking variables, or by using the call-stack as an implicit state tracking mechanism. While these methods are not immediately problematic, they tend to lack *explicitness*, and can lead to subtle bugs of the form "protocol action X is incorrectly allowed in state Y". For these reasons, we have implemented two *explicit* finite state machines. These machines aim to encode most of the protocol-specific state, in particular regarding what frame is allowed at what time. This target goal is sometimes not achieved: in particular, as of this writing the *stream* FSM contains a number of other state variables that really ought to be rolled into the state machine itself in the form of new states, or in the form of a transformation of the FSM to use state *vectors* instead of state *scalars*. The following sections contain some implementers notes on these FSMs. Connection State Machine ~~~~~~~~~~~~~~~~~~~~~~~~ The "outer" state machine, the first one that is encountered when sending or receiving data, is the connection state machine. This state machine tracks whole-connection state. This state machine is primarily intended to forbid certain actions on the basis of whether the implementation is acting as a client or a server. For example, clients are not permitted to send ``PUSH_PROMISE`` frames: this state machine forbids that by refusing to define a valid transition from the ``CLIENT_OPEN`` state for the ``SEND_PUSH_PROMISE`` event. Otherwise, this particular state machine triggers no side-effects. It has a very coarse, high-level, functionality. A visual representation of this FSM is shown below: .. image:: _static/h2.connection.H2ConnectionStateMachine.dot.png :alt: A visual representation of the connection FSM. :target: _static/h2.connection.H2ConnectionStateMachine.dot.png .. _stream-state-machine: Stream State Machine ~~~~~~~~~~~~~~~~~~~~ Once the connection state machine has been spun, any frame that belongs to a stream is passed to the stream state machine for its given stream. Each stream has its own instance of the state machine, but all of them share the transition table: this is because the table itself is sufficiently large that having it be per-instance would be a ridiculous memory overhead. Unlike the connection state machine, the stream state machine is quite complex. This is because it frequently needs to encode some side-effects. The most common side-effect is emitting a ``RST_STREAM`` frame when an error is encountered: the need to do this means that far more transitions need to be encoded than for the connection state machine. Many of the side-effect functions in this state machine also raise :class:`ProtocolError ` exceptions. This is almost always done on the basis of an extra state variable, which is an annoying code smell: it should always be possible for the state machine itself to police these using explicit state management. A future refactor will hopefully address this problem by making these additional state variables part of the state definitions in the FSM, which will lead to an expansion of the number of states but a greater degree of simplicity in understanding and tracking what is going on in the state machine. The other action taken by the side-effect functions defined here is returning :ref:`events `. Most of these events are returned directly to the user, and reflect the specific state transition that has taken place, but some of the events are purely *internal*: they are used to signal to other parts of the h2 codebase what action has been taken. The major use of the internal events functionality at this time is for validating header blocks: there are different rules for request headers than there are for response headers, and different rules again for trailers. The internal events are used to determine *exactly what* kind of data the user is attempting to send, and using that information to do the correct kind of validation. This approach ensures that the final source of truth about what's happening at the protocol level lives inside the FSM, which is an extremely important design principle we want to continue to enshrine in h2. A visual representation of this FSM is shown below: .. image:: _static/h2.stream.H2StreamStateMachine.dot.png :alt: A visual representation of the stream FSM. :target: _static/h2.stream.H2StreamStateMachine.dot.png .. _priority: Priority ~~~~~~~~ In the :ref:`stream-state-machine` section we said that any frame that belongs to a stream is passed to the stream state machine. This turns out to be not quite true. Specifically, while ``PRIORITY`` frames are technically sent on a given stream (that is, `RFC 7540 Section 6.3`_ defines them as "always identifying a stream" and forbids the use of stream ID ``0`` for them), in practice they are almost completely exempt from the usual stream FSM behaviour. Specifically, the RFC has this to say: The ``PRIORITY`` frame can be sent on a stream in any state, though it cannot be sent between consecutive frames that comprise a single header block (Section 4.3). Given that the consecutive header block requirement is handled outside of the FSMs, this section of the RFC essentially means that there is *never* a situation where it is invalid to receive a ``PRIORITY`` frame. This means that including it in the stream FSM would require that we allow ``SEND_PRIORITY`` and ``RECV_PRIORITY`` in all states. This is not a totally onerous task: however, another key note is that h2 uses the *absence* of a stream state machine to flag a closed stream. This is primarily for memory conservation reasons: if we needed to keep around an FSM for every stream we've ever seen, that would cause long-lived HTTP/2 connections to consume increasingly large amounts of memory. On top of this, it would require us to create a stream FSM each time we received a ``PRIORITY`` frame for a given stream, giving a malicious peer an easy route to force a h2 user to allocate nearly unbounded amounts of memory. For this reason, h2 circumvents the stream FSM entirely for ``PRIORITY`` frames. Instead, these frames are treated as being connection-level frames that *just happen* to identify a specific stream. They do not bring streams into being, or in any sense interact with h2's view of streams. Their stream details are treated as strictly metadata that h2 is not interested in beyond being able to parse it out. .. _RFC 7540 Section 6.3: https://tools.ietf.org/html/rfc7540#section-6.3 ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1618664999.0 h2-4.2.0/docs/source/negotiating-http2.rst0000644000076500000240000001611014036557047017732 0ustar00kriechistaffNegotiating HTTP/2 ================== `RFC 7540`_ specifies three methods of negotiating HTTP/2 connections. This document outlines how to use h2 with each one. .. _starting-alpn: HTTPS URLs (ALPN) ------------------------- Starting HTTP/2 for HTTPS URLs is outlined in `RFC 7540 Section 3.3`_. In this case, the client and server use a TLS extension to negotiate HTTP/2: `ALPN`_. How to use ALPN is currently not covered in this document: please consult the documentation for either the :mod:`ssl module ` in the standard library, or the :mod:`PyOpenSSL ` third-party modules, for more on this topic. This method is the simplest to use once the TLS connection is established. To use it with h2, after you've established the connection and confirmed that HTTP/2 has been negotiated with `ALPN`_, create a :class:`H2Connection ` object and call :meth:`H2Connection.initiate_connection `. This will ensure that the appropriate preamble data is placed in the data buffer. You should then immediately send the data returned by :meth:`H2Connection.data_to_send ` on your TLS connection. At this point, you're free to use all the HTTP/2 functionality provided by h2. .. note:: Although h2 is not concerned with negotiating protocol versions, it is important to note that support for `ALPN`_ is not available in the standard library of Python versions < 2.7.9. As a consequence, clients may encounter various errors due to protocol versions mismatch. Server Setup Example ~~~~~~~~~~~~~~~~~~~~ This example uses the APIs as defined in Python 3.5. If you are using an older version of Python you may not have access to the APIs used here. As noted above, please consult the documentation for the :mod:`ssl module ` to confirm. .. literalinclude:: ../../examples/fragments/server_https_setup_fragment.py :language: python :linenos: :encoding: utf-8 Client Setup Example ~~~~~~~~~~~~~~~~~~~~ The client example is very similar to the server example above. The :class:`SSLContext ` object requires some minor changes, as does the :class:`H2Connection `, but the bulk of the code is the same. .. literalinclude:: ../../examples/fragments/client_https_setup_fragment.py :language: python :linenos: :encoding: utf-8 .. _starting-upgrade: HTTP URLs (Upgrade) ------------------- Starting HTTP/2 for HTTP URLs is outlined in `RFC 7540 Section 3.2`_. In this case, the client and server use the HTTP Upgrade mechanism originally described in `RFC 7230 Section 6.7`_. The client sends its initial HTTP/1.1 request with two extra headers. The first is ``Upgrade: h2c``, which requests upgrade to cleartext HTTP/2. The second is a ``HTTP2-Settings`` header, which contains a specially formatted string that encodes a HTTP/2 Settings frame. To do this with h2 you have two slightly different flows: one for clients, one for servers. Clients ~~~~~~~ For a client, when sending the first request you should manually add your ``Upgrade`` header. You should then create a :class:`H2Connection ` object and call :meth:`H2Connection.initiate_upgrade_connection ` with no arguments. This method will return a bytestring to use as the value of your ``HTTP2-Settings`` header. If the server returns a ``101`` status code, it has accepted the upgrade, and you should immediately send the data returned by :meth:`H2Connection.data_to_send `. Now you should consume the entire ``101`` header block. All data after the ``101`` header block is HTTP/2 data that should be fed directly to :meth:`H2Connection.receive_data ` and handled as normal with h2. If the server does not return a ``101`` status code then it is not upgrading. Continue with HTTP/1.1 as normal: you may throw away your :class:`H2Connection ` object, as it is of no further use. The server will respond to your original request in HTTP/2. Please pay attention to the events received from h2, as they will define the server's response. Client Example ^^^^^^^^^^^^^^ The code below demonstrates how to handle a plaintext upgrade from the perspective of the client. For the purposes of keeping the example code as simple and generic as possible it uses the synchronous socket API that comes with the Python standard library: if you want to use asynchronous I/O, you will need to translate this code to the appropriate idiom. .. literalinclude:: ../../examples/fragments/client_upgrade_fragment.py :language: python :linenos: :encoding: utf-8 Servers ~~~~~~~ If the first request you receive on a connection from the client contains an ``Upgrade`` header with the ``h2c`` token in it, and you're willing to upgrade, you should create a :class:`H2Connection ` object and call :meth:`H2Connection.initiate_upgrade_connection ` with the value of the ``HTTP2-Settings`` header (as a bytestring) as the only argument. Then, you should send back a ``101`` response that contains ``h2c`` in the ``Upgrade`` header. That response will inform the client that you're switching to HTTP/2. Then, you should immediately send the data that is returned to you by :meth:`H2Connection.data_to_send ` on the connection: this is a necessary part of the HTTP/2 upgrade process. At this point, you may now respond to the original HTTP/1.1 request in HTTP/2 by calling the appropriate methods on the :class:`H2Connection ` object. No further HTTP/1.1 may be sent on this connection: from this point onward, all data sent by you and the client will be HTTP/2 data. Server Example ^^^^^^^^^^^^^^ The code below demonstrates how to handle a plaintext upgrade from the perspective of the server. For the purposes of keeping the example code as simple and generic as possible it uses the synchronous socket API that comes with the Python standard library: if you want to use asynchronous I/O, you will need to translate this code to the appropriate idiom. .. literalinclude:: ../../examples/fragments/server_upgrade_fragment.py :language: python :linenos: :encoding: utf-8 Prior Knowledge --------------- It's possible that you as a client know that a particular server supports HTTP/2, and that you do not need to perform any of the negotiations described above. In that case, you may follow the steps in :ref:`starting-alpn`, ignoring all references to ALPN: there's no need to perform the upgrade dance described in :ref:`starting-upgrade`. .. _RFC 7540: https://tools.ietf.org/html/rfc7540 .. _RFC 7540 Section 3.2: https://tools.ietf.org/html/rfc7540#section-3.2 .. _RFC 7540 Section 3.3: https://tools.ietf.org/html/rfc7540#section-3.3 .. _ALPN: https://en.wikipedia.org/wiki/Application-Layer_Protocol_Negotiation .. _RFC 7230 Section 6.7: https://tools.ietf.org/html/rfc7230#section-6.7 ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1631462011.0 h2-4.2.0/docs/source/plain-sockets-example.rst0000644000076500000240000000121614117421173020557 0ustar00kriechistaffPlain Sockets Example Client ============================ This example is a basic HTTP/2 client written using plain Python `sockets`_, and `ssl`_ TLS/SSL wrapper for socket objects. This client is *not* a complete production-ready HTTP/2 client and only intended as a demonstration sample. This example shows the bare minimum that is needed to send an HTTP/2 request to a server, and read back a response body. .. literalinclude:: ../../examples/plain_sockets/plain_sockets_client.py :language: python :linenos: :encoding: utf-8 .. _sockets: https://docs.python.org/3/library/socket.html .. _ssl: https://docs.python.org/3/library/ssl.html ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1596369288.0 h2-4.2.0/docs/source/release-notes.rst0000644000076500000240000001204013711524610017114 0ustar00kriechistaffRelease Notes ============= This document contains release notes for Hyper-h2. In addition to the :ref:`detailed-release-notes` found at the bottom of this document, this document also includes a high-level prose overview of each major release after 1.0.0. High Level Notes ---------------- 3.0.0: 24 March 2017 ~~~~~~~~~~~~~~~~~~~~ The Hyper-h2 team and the Hyper project are delighted to announce the release of Hyper-h2 version 3.0.0! Unlike the really notable 2.0.0 release, this release is proportionally quite small: however, it has the effect of removing a lot of cruft and complexity that has built up in the codebase over the lifetime of the v2 release series. This release was motivated primarily by discovering that applications that attempted to use both HTTP/1.1 and HTTP/2 using hyper-h2 would encounter problems with cookies, because hyper-h2 did not join together cookie headers as required by RFC 7540. Normally adding such behaviour would be a non-breaking change, but we previously had no flags to prevent normalization of received HTTP headers. Because it makes no sense for the cookie to be split *by default*, we needed to add a controlling flag and set it to true. The breaking nature of this change is very subtle, and it's possible most users would never notice, but nevertheless it *is* a breaking change and we need to treat it as such. Happily, we can take this opportunity to finalise a bunch of deprecations we'd made over the past year. The v2 release series was long-lived and successful, having had a series of releases across the past year-and-a-bit, and the Hyper team are very proud of it. However, it's time to open a new chapter, and remove the deprecated code. The past year has been enormously productive for the Hyper team. A total of 30 v2 releases were made, an enormous amount of work. A good number of people have made their first contribution in this time, more than I can thank reasonably without taking up an unreasonable amount of space in this document, so instead I invite you to check out `our awesome contributor list`_. We're looking forward to the next chapter in hyper-h2: it's been a fun ride so far, and we hope even more of you come along and join in the fun over the next year! .. _our awesome contributor list: https://github.com/python-hyper/hyper-h2/graphs/contributors 2.0.0: 25 January 2016 ~~~~~~~~~~~~~~~~~~~~~~ The Hyper-h2 team and the Hyper project are delighted to announce the release of Hyper-h2 version 2.0.0! This is an enormous release that contains a gigantic collection of new features and fixes, with the goal of making it easier than ever to use Hyper-h2 to build a compliant HTTP/2 server or client. An enormous chunk of this work has been focused on tighter enforcement of restrictions in RFC 7540, ensuring that we correctly police the actions of remote peers, and error appropriately when those peers violate the specification. Several of these constitute breaking changes, because data that was previously received and handled without obvious error now raises ``ProtocolError`` exceptions and causes the connection to be terminated. Additionally, the public API was cleaned up and had several helper methods that had been inavertently exposed removed from the public API. The team wants to stress that while Hyper-h2 follows semantic versioning, the guarantees of semver apply only to the public API as documented in :doc:`api`. Reducing the surface area of these APIs makes it easier for us to continue to ensure that the guarantees of semver are respected on our public API. We also attempted to clear up some of the warts that had appeared in the API, and add features that are helpful for implementing HTTP/2 endpoints. For example, the :class:`H2Connection ` object now exposes a method for generating the next stream ID that your client or server can use to initiate a connection (:meth:`get_next_available_stream_id `). We also removed some needless return values that were guaranteed to return empty lists, which were an attempt to make a forward-looking guarantee that was entirely unneeded. Altogether, this has been an extremely productive period for Hyper-h2, and a lot of great work has been done by the community. To that end, we'd also like to extend a great thankyou to those contributors who made their first contribution to the project between release 1.0.0 and 2.0.0. Many thanks to: `Thomas Kriechbaumer`_, `Alex Chan`_, `Maximilian Hils`_, and `Glyph`_. For a full historical list of contributors, see `contributors`_. We're looking forward to the next few months of Python HTTP/2 work, and hoping that you'll find lots of excellent HTTP/2 applications to build with Hyper-h2! .. _Thomas Kriechbaumer: https://github.com/Kriechi .. _Alex Chan: https://github.com/alexwlchan .. _Maximilian Hils: https://github.com/mhils .. _Glyph: https://github.com/glyph .. _contributors: https://github.com/python-hyper/hyper-h2/blob/b14817b79c7bb1661e1aa84ef7920c009ef1e75b/CONTRIBUTORS.rst .. _detailed-release-notes: .. include:: ../../CHANGELOG.rst ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1618664999.0 h2-4.2.0/docs/source/release-process.rst0000644000076500000240000000444014036557047017462 0ustar00kriechistaffRelease Process =============== Because of h2's place at the bottom of the dependency tree, it is extremely important that the project maintains a diligent release schedule. This document outlines our process for managing releases. Versioning ---------- h2 follows `semantic versioning`_ of its public API when it comes to numbering releases. The public API of h2 is strictly limited to the entities listed in the :doc:`api` documentation: anything not mentioned in that document is not considered part of the public API and is not covered by the versioning guarantees given by semantic versioning. Maintenance ----------- h2 has the notion of a "release series", given by a major and minor version number: for example, there is the 2.1 release series. When each minor release is made and a release series is born, a branch is made off the release tag: for example, for the 2.1 release series, the 2.1.X branch. All changes merged into the master branch will be evaluated for whether they can be considered 'bugfixes' only (that is, they do not affect the public API). If they can, they will also be cherry-picked back to all active maintenance branches that require the bugfix. If the bugfix is not necessary, because the branch in question is unaffected by that bug, the bugfix will not be backported. Supported Release Series' ------------------------- The developers of h2 commit to supporting the following release series: - The most recent, as identified by the first two numbers in the highest version currently released. - The immediately prior release series. The only exception to this policy is that no release series earlier than the 2.1 series will be supported. In this context, "supported" means that they will continue to receive bugfix releases. For releases other than the ones identified above, no support is guaranteed. The developers may *choose* to support such a release series, but they do not promise to. The exception here is for security vulnerabilities. If a security vulnerability is identified in an out-of-support release series, the developers will do their best to patch it and issue an emergency release. For more information, see `our security documentation`_. .. _semantic versioning: http://semver.org/ .. _our security documentation: http://python-hyper.org/en/latest/security.html ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1596369288.0 h2-4.2.0/docs/source/testimonials.rst0000644000076500000240000000072513711524610017070 0ustar00kriechistaffTestimonials ============ Glyph Lefkowitz ~~~~~~~~~~~~~~~ Frankly, Hyper-h2 is almost SURREAL in how well-factored and decoupled the implementation is from I/O. If libraries in the Python ecosystem looked like this generally, Twisted would be a much better platform than it is. (Frankly, most of Twisted's _own_ protocol implementations should aspire to such cleanliness.) (`Source `_) ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1596369288.0 h2-4.2.0/docs/source/tornado-example.rst0000644000076500000240000000066713711524610017461 0ustar00kriechistaffTornado Example Server ====================== This example is a basic HTTP/2 server written using the `Tornado`_ asynchronous networking library. The server returns the request headers as a JSON document to the caller, just like the example from the :doc:`basic-usage` document. .. literalinclude:: ../../examples/tornado/tornado-server.py :language: python :linenos: :encoding: utf-8 .. _Tornado: http://www.tornadoweb.org/ ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1596369288.0 h2-4.2.0/docs/source/twisted-example.rst0000644000076500000240000000115413711524610017466 0ustar00kriechistaffTwisted Example Server ====================== This example is a basic HTTP/2 server written for the `Twisted`_ asynchronous networking framework. This is a relatively fleshed out example, and in particular it makes sure to obey HTTP/2 flow control rules. This server differs from some of the other example servers by serving files, rather than simply sending JSON responses. This makes the example lengthier, but also brings it closer to a real-world use-case. .. literalinclude:: ../../examples/twisted/twisted-server.py :language: python :linenos: :encoding: utf-8 .. _Twisted: https://twistedmatrix.com/././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1596369288.0 h2-4.2.0/docs/source/twisted-head-example.rst0000644000076500000240000000103713711524610020365 0ustar00kriechistaffTwisted Example Client: Head Requests ===================================== This example is a basic HTTP/2 client written for the `Twisted`_ asynchronous networking framework. This client is fairly simple: it makes a hard-coded HEAD request to nghttp2.org/httpbin/ and prints out the response data. Its purpose is to demonstrate how to write a very basic HTTP/2 client implementation. .. literalinclude:: ../../examples/twisted/head_request.py :language: python :linenos: :encoding: utf-8 .. _Twisted: https://twistedmatrix.com/ ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1596369288.0 h2-4.2.0/docs/source/twisted-post-example.rst0000644000076500000240000000117413711524610020453 0ustar00kriechistaffTwisted Example Client: Post Requests ===================================== This example is a basic HTTP/2 client written for the `Twisted`_ asynchronous networking framework. This client is fairly simple: it makes a hard-coded POST request to nghttp2.org/httpbin/post and prints out the response data, sending a file that is provided on the command line or the script itself. Its purpose is to demonstrate how to write a HTTP/2 client implementation that handles flow control. .. literalinclude:: ../../examples/twisted/post_request.py :language: python :linenos: :encoding: utf-8 .. _Twisted: https://twistedmatrix.com/ ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737582431.0 h2-4.2.0/docs/source/wsgi-example.rst0000644000076500000240000000213114744263537016767 0ustar00kriechistaffExample HTTP/2-only WSGI Server =============================== This example is a more complex HTTP/2 server that acts as a WSGI server, passing data to an arbitrary WSGI application. This example is written using `asyncio`_. The server supports most of PEP-3333, and so could in principle be used as a production WSGI server: however, that's *not recommended* as certain shortcuts have been taken to ensure ease of implementation and understanding. The main advantages of this example are: 1. It properly demonstrates HTTP/2 flow control management. 2. It demonstrates how to plug h2 into a larger, more complex application. .. literalinclude:: ../../examples/asyncio/wsgi-server.py :language: python :linenos: :encoding: utf-8 You can use ``cert.crt`` and ``cert.key`` files provided within the repository or generate your own certificates using `OpenSSL`_: .. code-block:: console $ openssl req -x509 -newkey rsa:2048 -keyout cert.key -out cert.crt -days 365 -nodes .. _asyncio: https://docs.python.org/3/library/asyncio.html .. _OpenSSL: https://openssl-library.org/source/index.html ././@PaxHeader0000000000000000000000000000003400000000000010212 xustar0028 mtime=1738482098.7409368 h2-4.2.0/examples/0000755000076500000240000000000014747620663013224 5ustar00kriechistaff././@PaxHeader0000000000000000000000000000003400000000000010212 xustar0028 mtime=1738482098.7617738 h2-4.2.0/examples/asyncio/0000755000076500000240000000000014747620663014671 5ustar00kriechistaff././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737582431.0 h2-4.2.0/examples/asyncio/asyncio-server.py0000644000076500000240000001664514744263537020230 0ustar00kriechistaff# -*- coding: utf-8 -*- """ asyncio-server.py ~~~~~~~~~~~~~~~~~ A fully-functional HTTP/2 server using asyncio. Requires Python 3.5+. This example demonstrates handling requests with bodies, as well as handling those without. In particular, it demonstrates the fact that DataReceived may be called multiple times, and that applications must handle that possibility. """ import asyncio import io import json import ssl import collections from typing import List, Tuple from h2.config import H2Configuration from h2.connection import H2Connection from h2.events import ( ConnectionTerminated, DataReceived, RemoteSettingsChanged, RequestReceived, StreamEnded, StreamReset, WindowUpdated ) from h2.errors import ErrorCodes from h2.exceptions import ProtocolError, StreamClosedError from h2.settings import SettingCodes RequestData = collections.namedtuple('RequestData', ['headers', 'data']) class H2Protocol(asyncio.Protocol): def __init__(self): config = H2Configuration(client_side=False, header_encoding='utf-8') self.conn = H2Connection(config=config) self.transport = None self.stream_data = {} self.flow_control_futures = {} def connection_made(self, transport: asyncio.Transport): self.transport = transport self.conn.initiate_connection() self.transport.write(self.conn.data_to_send()) def connection_lost(self, exc): for future in self.flow_control_futures.values(): future.cancel() self.flow_control_futures = {} def data_received(self, data: bytes): try: events = self.conn.receive_data(data) except ProtocolError as e: self.transport.write(self.conn.data_to_send()) self.transport.close() else: self.transport.write(self.conn.data_to_send()) for event in events: if isinstance(event, RequestReceived): self.request_received(event.headers, event.stream_id) elif isinstance(event, DataReceived): self.receive_data( event.data, event.flow_controlled_length, event.stream_id ) elif isinstance(event, StreamEnded): self.stream_complete(event.stream_id) elif isinstance(event, ConnectionTerminated): self.transport.close() elif isinstance(event, StreamReset): self.stream_reset(event.stream_id) elif isinstance(event, WindowUpdated): self.window_updated(event.stream_id, event.delta) elif isinstance(event, RemoteSettingsChanged): if SettingCodes.INITIAL_WINDOW_SIZE in event.changed_settings: self.window_updated(None, 0) self.transport.write(self.conn.data_to_send()) def request_received(self, headers: List[Tuple[str, str]], stream_id: int): headers = collections.OrderedDict(headers) method = headers[':method'] # Store off the request data. request_data = RequestData(headers, io.BytesIO()) self.stream_data[stream_id] = request_data def stream_complete(self, stream_id: int): """ When a stream is complete, we can send our response. """ try: request_data = self.stream_data[stream_id] except KeyError: # Just return, we probably 405'd this already return headers = request_data.headers body = request_data.data.getvalue().decode('utf-8') data = json.dumps( {"headers": headers, "body": body}, indent=4 ).encode("utf8") response_headers = ( (':status', '200'), ('content-type', 'application/json'), ('content-length', str(len(data))), ('server', 'asyncio-h2'), ) self.conn.send_headers(stream_id, response_headers) asyncio.ensure_future(self.send_data(data, stream_id)) def receive_data(self, data: bytes, flow_controlled_length: int, stream_id: int): """ We've received some data on a stream. If that stream is one we're expecting data on, save it off (and account for the received amount of data in flow control so that the client can send more data). Otherwise, reset the stream. """ try: stream_data = self.stream_data[stream_id] except KeyError: self.conn.reset_stream( stream_id, error_code=ErrorCodes.PROTOCOL_ERROR ) else: stream_data.data.write(data) self.conn.acknowledge_received_data(flow_controlled_length, stream_id) def stream_reset(self, stream_id): """ A stream reset was sent. Stop sending data. """ if stream_id in self.flow_control_futures: future = self.flow_control_futures.pop(stream_id) future.cancel() async def send_data(self, data, stream_id): """ Send data according to the flow control rules. """ while data: while self.conn.local_flow_control_window(stream_id) < 1: try: await self.wait_for_flow_control(stream_id) except asyncio.CancelledError: return chunk_size = min( self.conn.local_flow_control_window(stream_id), len(data), self.conn.max_outbound_frame_size, ) try: self.conn.send_data( stream_id, data[:chunk_size], end_stream=(chunk_size == len(data)) ) except (StreamClosedError, ProtocolError): # The stream got closed and we didn't get told. We're done # here. break self.transport.write(self.conn.data_to_send()) data = data[chunk_size:] async def wait_for_flow_control(self, stream_id): """ Waits for a Future that fires when the flow control window is opened. """ f = asyncio.Future() self.flow_control_futures[stream_id] = f await f def window_updated(self, stream_id, delta): """ A window update frame was received. Unblock some number of flow control Futures. """ if stream_id and stream_id in self.flow_control_futures: f = self.flow_control_futures.pop(stream_id) f.set_result(delta) elif not stream_id: for f in self.flow_control_futures.values(): f.set_result(delta) self.flow_control_futures = {} ssl_context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH) ssl_context.options |= ( ssl.OP_NO_TLSv1 | ssl.OP_NO_TLSv1_1 | ssl.OP_NO_COMPRESSION ) ssl_context.load_cert_chain(certfile="cert.crt", keyfile="cert.key") ssl_context.set_alpn_protocols(["h2"]) loop = asyncio.get_event_loop() # Each client connection will create a new protocol instance coro = loop.create_server(H2Protocol, '127.0.0.1', 8443, ssl=ssl_context) server = loop.run_until_complete(coro) # Serve requests until Ctrl+C is pressed print('Serving on {}'.format(server.sockets[0].getsockname())) try: loop.run_forever() except KeyboardInterrupt: pass finally: # Close the server server.close() loop.run_until_complete(server.wait_closed()) loop.close() ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1501439525.0 h2-4.2.0/examples/asyncio/cert.crt0000644000076500000240000000240113137423045016320 0ustar00kriechistaff-----BEGIN CERTIFICATE----- MIIDhTCCAm2gAwIBAgIJAOrxh0dOYJLdMA0GCSqGSIb3DQEBCwUAMFkxCzAJBgNV BAYTAkFVMRMwEQYDVQQIDApTb21lLVN0YXRlMSEwHwYDVQQKDBhJbnRlcm5ldCBX aWRnaXRzIFB0eSBMdGQxEjAQBgNVBAMMCWxvY2FsaG9zdDAeFw0xNTA5MTkxNDE2 NDRaFw0xNTEwMTkxNDE2NDRaMFkxCzAJBgNVBAYTAkFVMRMwEQYDVQQIDApTb21l LVN0YXRlMSEwHwYDVQQKDBhJbnRlcm5ldCBXaWRnaXRzIFB0eSBMdGQxEjAQBgNV BAMMCWxvY2FsaG9zdDCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMqt A1iu8EN00FU0eBcBGlLVmNEgV7Jkbukra+kwS8j/U2y50QPGJc/FiIVDfuBqk5dL ACTNc6A/FQcXvWmOc5ixmC3QKKasMpuofqKz0V9C6irZdYXZ9rcsW0gHQIr989yd R+N1VbIlEVW/T9FJL3B2UD9GVIkUELzm47CSOWZvAxQUlsx8CUNuUCWqyZJoqTFN j0LeJDOWGCsug1Pkj0Q1x+jMVL6l6Zf6vMkLNOMsOsWsxUk+0L3tl/OzcTgUOCsw UzY59RIi6Rudrp0oaU8NuHr91yiSqPbKFlX10M9KwEEdnIpcxhND3dacrDycj3ux eWlqKync2vOFUkhwiaMCAwEAAaNQME4wHQYDVR0OBBYEFA0PN+PGoofZ+QIys2Jy 1Zz94vBOMB8GA1UdIwQYMBaAFA0PN+PGoofZ+QIys2Jy1Zz94vBOMAwGA1UdEwQF MAMBAf8wDQYJKoZIhvcNAQELBQADggEBAEplethBoPpcP3EbR5Rz6snDDIcbtAJu Ngd0YZppGT+P0DYnPJva4vRG3bb84ZMSuppz5j67qD6DdWte8UXhK8BzWiHzwmQE QmbKyzzTMKQgTNFntpx5cgsSvTtrHpNYoMHzHOmyAOboNeM0DWiRXsYLkWTitLTN qbOpstwPubExbT9lPjLclntShT/lCupt+zsbnrR9YiqlYFY/fDzfAybZhrD5GMBY XdMPItwAc/sWvH31yztarjkLmld76AGCcO5r8cSR/cX98SicyfjOBbSco8GkjYNY 582gTPkKGYpStuN7GNT5tZmxvMq935HRa2XZvlAIe8ufp8EHVoYiF3c= -----END CERTIFICATE----- ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1501439525.0 h2-4.2.0/examples/asyncio/cert.key0000644000076500000240000000321713137423045016326 0ustar00kriechistaff-----BEGIN RSA PRIVATE KEY----- MIIEpAIBAAKCAQEAyq0DWK7wQ3TQVTR4FwEaUtWY0SBXsmRu6Str6TBLyP9TbLnR A8Ylz8WIhUN+4GqTl0sAJM1zoD8VBxe9aY5zmLGYLdAopqwym6h+orPRX0LqKtl1 hdn2tyxbSAdAiv3z3J1H43VVsiURVb9P0UkvcHZQP0ZUiRQQvObjsJI5Zm8DFBSW zHwJQ25QJarJkmipMU2PQt4kM5YYKy6DU+SPRDXH6MxUvqXpl/q8yQs04yw6xazF ST7Qve2X87NxOBQ4KzBTNjn1EiLpG52unShpTw24ev3XKJKo9soWVfXQz0rAQR2c ilzGE0Pd1pysPJyPe7F5aWorKdza84VSSHCJowIDAQABAoIBACp+nh4BB/VMz8Wd q7Q/EfLeQB1Q57JKpoqTBRwueSVai3ZXe4CMEi9/HkG6xiZtkiZ9njkZLq4hq9oB 2z//kzMnwV2RsIRJxI6ohGy+wR51HD4BvEdlTPpY/Yabpqe92VyfSYxidKZWaU0O QMED1EODOw4ZQ+4928iPrJu//PMB4e7TFao0b9Fk/XLWtu5/tQZz9jsrlTi1zthh 7n+oaGNhfTeIJJL4jrhTrKW1CLHXATtr9SJlfZ3wbMxQVeyj2wUlP1V0M6kBuhNj tbGbMpixD5iCNJ49Cm2PHg+wBOfS3ADGIpi3PcGw5mb8nB3N9eGBRPhLShAlq5Hi Lv4tyykCgYEA8u3b3xJ04pxWYN25ou/Sc8xzgDCK4XvDNdHVTuZDjLVA+VTVPzql lw7VvJArsx47MSPvsaX/+4hQXYtfnR7yJpx6QagvQ+z4ludnIZYrQwdUmb9pFL1s 8UNj+3j9QFRPenIiIQ8qxxNIQ9w2HsVQ8scvc9CjYop/YYAPaQyHaL8CgYEA1ZSz CR4NcpfgRSILdhb1dLcyw5Qus1VOSAx3DYkhDkMiB8XZwgMdJjwehJo9yaqRCLE8 Sw5znMnkfoZpu7+skrjK0FqmMpXMH9gIszHvFG8wSw/6+2HIWS19/wOu8dh95LuC 0zurMk8rFqxgWMWF20afhgYrUz42cvUTo10FVB0CgYEAt7mW6W3PArfUSCxIwmb4 VmXREKkl0ATHDYQl/Cb//YHzot467TgQll883QB4XF5HzBFurX9rSzO7/BN1e6I0 52i+ubtWC9xD4fUetXMaQvZfUGxIL8xXgVxDWKQXfLiG54c8Mp6C7s6xf8kjEUCP yR1F0SSA/Pzb+8RbY0p7eocCgYA+1rs+SXtHZev0KyoYGnUpW+Uxqd17ofOgOxqj /t6c5Z+TjeCdtnDTGQkZlo/rT6XQWuUUaDIXxUbW+xEMzj4mBPyXBLS1WWFvVQ5q OpzO9E/PJeqAH6rkof/aEelc+oc/zvOU1o9uA+D3kMvgEm1psIOq2RHSMhGvDPA0 NmAk+QKBgQCwd1681GagdIYSZUCBecnLtevXmIsJyDW2yR1NNcIe/ukcVQREMDvy 5DDkhnGDgnV1D5gYcXb34g9vYvbfTnBMl/JXmMAAG1kIS+3pvHyN6f1poVe3yJV1 yHVuvymnJxKnyaV0L3ntepVvV0vVNIkA3oauoUTLto6txBI+b/ImDA== -----END RSA PRIVATE KEY----- ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737582431.0 h2-4.2.0/examples/asyncio/wsgi-server.py0000644000076500000240000007357214744263537017536 0ustar00kriechistaff# -*- coding: utf-8 -*- """ asyncio-server.py ~~~~~~~~~~~~~~~~~ A fully-functional WSGI server, written using h2. Requires asyncio. To test it, try installing httpbin from pip (``pip install httpbin``) and then running the server (``python asyncio-server.py httpbin:app``). This server does not support HTTP/1.1: it is a HTTP/2-only WSGI server. The purpose of this code is to demonstrate how to integrate h2 into a more complex application, and to demonstrate several principles of concurrent programming. The architecture looks like this: +---------------------------------+ | 1x HTTP/2 Server Thread | | (running asyncio) | +---------------------------------+ +---------------------------------+ | N WSGI Application Threads | | (no asyncio) | +---------------------------------+ Essentially, we spin up an asyncio-based event loop in the main thread. This launches one HTTP/2 Protocol instance for each inbound connection, all of which will read and write data from within the main thread in an asynchronous manner. When each HTTP request comes in, the server will build the WSGI environment dictionary and create a ``Stream`` object. This object will hold the relevant state for the request/response pair and will act as the WSGI side of the logic. That object will then be passed to a background thread pool, and when a worker is available the WSGI logic will begin to be executed. This model ensures that the asyncio web server itself is never blocked by the WSGI application. The WSGI application and the HTTP/2 server communicate via an asyncio queue, together with locks and threading events. The locks themselves are implicit in asyncio's "call_soon_threadsafe", which allows for a background thread to register an action with the main asyncio thread. When the asyncio thread eventually takes the action in question it sets as threading event, signaling to the background thread that it is free to continue its work. To make the WSGI application work with flow control, there is a very important invariant that must be observed. Any WSGI action that would cause data to be emitted to the network MUST be accompanied by a threading Event that is not set until that data has been written to the transport. This ensures that the WSGI application *blocks* until the data is actually sent. The reason we require this invariant is that the HTTP/2 server may choose to re-order some data chunks for flow control reasons: that is, the application for stream X may have actually written its data first, but the server may elect to send the data for stream Y first. This means that it's vital that there not be *two* writes for stream X active at any one point or they may get reordered, which would be particularly terrible. Thus, the server must cooperate to ensure that each threading event only fires when the *complete* data for that event has been written to the asyncio transport. Any earlier will cause untold craziness. """ import asyncio import importlib import queue import ssl import sys import threading from h2.config import H2Configuration from h2.connection import H2Connection from h2.events import ( DataReceived, RequestReceived, WindowUpdated, StreamEnded, StreamReset ) # Used to signal that a request has completed. # # This is a convenient way to do "in-band" signaling of stream completion # without doing anything so heavyweight as using a class. Essentially, we can # test identity against this empty object. In fact, this is so convenient that # we use this object for all streams, for data in both directions: in and out. END_DATA_SENTINEL = object() # The WSGI callable. Stored here so that the protocol instances can get hold # of the data. APPLICATION = None class H2Protocol(asyncio.Protocol): def __init__(self): config = H2Configuration(client_side=False, header_encoding='utf-8') # Our server-side state machine. self.conn = H2Connection(config=config) # The backing transport. self.transport = None # A dictionary of ``Stream`` objects, keyed by their stream ID. This # makes it easy to route data to the correct WSGI application instance. self.streams = {} # A queue of data emitted by WSGI applications that has not yet been # sent. Each stream may only have one chunk of data in either this # queue or the flow_controlled_data dictionary at any one time. self._stream_data = asyncio.Queue() # Data that has been pulled off the queue that is for a stream blocked # behind flow control limitations. This is used to avoid spinning on # _stream_data queue when a stream cannot have its data sent. Data that # cannot be sent on the connection when it is popped off the queue gets # placed here until the stream flow control window opens up again. self._flow_controlled_data = {} # A reference to the loop in which this protocol runs. This is needed # to synchronise up with background threads. self._loop = asyncio.get_event_loop() # Any streams that have been remotely reset. We keep track of these to # ensure that we don't emit data from a WSGI application whose stream # has been cancelled. self._reset_streams = set() # Keep track of the loop sending task so we can kill it when the # connection goes away. self._send_loop_task = None def connection_made(self, transport): """ The connection has been made. Here we need to save off our transport, do basic HTTP/2 connection setup, and then start our data writing coroutine. """ self.transport = transport self.conn.initiate_connection() self.transport.write(self.conn.data_to_send()) self._send_loop_task = self._loop.create_task(self.sending_loop()) def connection_lost(self, exc): """ With the end of the connection, we just want to cancel our data sending coroutine. """ self._send_loop_task.cancel() def data_received(self, data): """ Process inbound data. """ events = self.conn.receive_data(data) for event in events: if isinstance(event, RequestReceived): self.request_received(event) elif isinstance(event, DataReceived): self.data_frame_received(event) elif isinstance(event, WindowUpdated): self.window_opened(event) elif isinstance(event, StreamEnded): self.end_stream(event) elif isinstance(event, StreamReset): self.reset_stream(event) outbound_data = self.conn.data_to_send() if outbound_data: self.transport.write(outbound_data) def window_opened(self, event): """ The flow control window got opened. This is important because it's possible that we were unable to send some WSGI data because the flow control window was too small. If that happens, the sending_loop coroutine starts buffering data. As the window gets opened, we need to unbuffer the data. We do that by placing the data chunks back on the back of the send queue and letting the sending loop take another shot at sending them. This system only works because we require that each stream only have *one* data chunk in the sending queue at any time. The threading events force this invariant to remain true. """ if event.stream_id: # This is specific to a single stream. if event.stream_id in self._flow_controlled_data: self._stream_data.put_nowait( self._flow_controlled_data.pop(event.stream_id) ) else: # This event is specific to the connection. Free up *all* the # streams. This is a bit tricky, but we *must not* yield the flow # of control here or it all goes wrong. for data in self._flow_controlled_data.values(): self._stream_data.put_nowait(data) self._flow_controlled_data.clear() async def sending_loop(self): """ A call that loops forever, attempting to send data. This sending loop contains most of the flow-control smarts of this class: it pulls data off of the asyncio queue and then attempts to send it. The difficulties here are all around flow control. Specifically, a chunk of data may be too large to send. In this case, what will happen is that this coroutine will attempt to send what it can and will then store the unsent data locally. When a flow control event comes in that data will be freed up and placed back onto the asyncio queue, causing it to pop back up into the sending logic of this coroutine. This method explicitly *does not* handle HTTP/2 priority. That adds an extra layer of complexity to what is already a fairly complex method, and we'll look at how to do it another time. This coroutine explicitly *does not end*. """ while True: stream_id, data, event = await self._stream_data.get() # If this stream got reset, just drop the data on the floor. Note # that we need to reset the event here to make sure that # application doesn't lock up. if stream_id in self._reset_streams: event.set() # Check if the body is done. If it is, this is really easy! Again, # we *must* set the event here or the application will lock up. if data is END_DATA_SENTINEL: self.conn.end_stream(stream_id) self.transport.write(self.conn.data_to_send()) event.set() continue # We need to send data, but not to exceed the flow control window. # For that reason, grab only the data that fits: we'll buffer the # rest. window_size = self.conn.local_flow_control_window(stream_id) chunk_size = min(window_size, len(data)) data_to_send = data[:chunk_size] data_to_buffer = data[chunk_size:] if data_to_send: # There's a maximum frame size we have to respect. Because we # aren't paying any attention to priority here, we can quite # safely just split this string up into chunks of max frame # size and blast them out. # # In a *real* application you'd want to consider priority here. max_size = self.conn.max_outbound_frame_size chunks = ( data_to_send[x:x+max_size] for x in range(0, len(data_to_send), max_size) ) for chunk in chunks: self.conn.send_data(stream_id, chunk) self.transport.write(self.conn.data_to_send()) # If there's data left to buffer, we should do that. Put it in a # dictionary and *don't set the event*: the app must not generate # any more data until we got rid of all of this data. if data_to_buffer: self._flow_controlled_data[stream_id] = ( stream_id, data_to_buffer, event ) else: # We sent everything. We can let the WSGI app progress. event.set() def request_received(self, event): """ A HTTP/2 request has been received. We need to invoke the WSGI application in a background thread to handle it. """ # First, we are going to want an object to hold all the relevant state # for this request/response. For that, we have a stream object. We # need to store the stream object somewhere reachable for when data # arrives later. s = Stream(event.stream_id, self) self.streams[event.stream_id] = s # Next, we need to build the WSGI environ dictionary. environ = _build_environ_dict(event.headers, s) # Finally, we want to throw these arguments out to a threadpool and # let it run. self._loop.run_in_executor( None, s.run_in_threadpool, APPLICATION, environ, ) def data_frame_received(self, event): """ Data has been received by WSGI server and needs to be dispatched to a running application. Note that the flow control window is not modified here. That's deliberate: see Stream.__next__ for a longer discussion of why. """ # Grab the stream in question from our dictionary and pass it on. stream = self.streams[event.stream_id] stream.receive_data(event.data, event.flow_controlled_length) def end_stream(self, event): """ The stream data is complete. """ stream = self.streams[event.stream_id] stream.request_complete() def reset_stream(self, event): """ A stream got forcefully reset. This is a tricky thing to deal with because WSGI doesn't really have a good notion for it. Essentially, you have to let the application run until completion, but not actually let it send any data. We do that by discarding any data we currently have for it, and then marking the stream as reset to allow us to spot when that stream is trying to send data and drop that data on the floor. We then *also* signal the WSGI application that no more data is incoming, to ensure that it does not attempt to do further reads of the data. """ if event.stream_id in self._flow_controlled_data: del self._flow_controlled_data[event.stream_id] self._reset_streams.add(event.stream_id) self.end_stream(event) def data_for_stream(self, stream_id, data): """ Thread-safe method called from outside the main asyncio thread in order to send data on behalf of a WSGI application. Places data being written by a stream on an asyncio queue. Returns a threading event that will fire when that data is sent. """ event = threading.Event() self._loop.call_soon_threadsafe( self._stream_data.put_nowait, (stream_id, data, event) ) return event def send_response(self, stream_id, headers): """ Thread-safe method called from outside the main asyncio thread in order to send the HTTP response headers on behalf of a WSGI application. Returns a threading event that will fire when the headers have been emitted to the network. """ event = threading.Event() def _inner_send(stream_id, headers, event): self.conn.send_headers(stream_id, headers, end_stream=False) self.transport.write(self.conn.data_to_send()) event.set() self._loop.call_soon_threadsafe( _inner_send, stream_id, headers, event ) return event def open_flow_control_window(self, stream_id, increment): """ Opens a flow control window for the given stream by the given amount. Called from a WSGI thread. Does not return an event because there's no need to block on this action, it may take place at any time. """ def _inner_open(stream_id, increment): self.conn.increment_flow_control_window(increment, stream_id) self.conn.increment_flow_control_window(increment, None) self.transport.write(self.conn.data_to_send()) self._loop.call_soon_threadsafe( _inner_open, stream_id, increment, ) class Stream: """ This class holds all of the state for a single stream. It also provides several of the callables used by the WSGI application. Finally, it provides the logic for actually interfacing with the WSGI application. For these reasons, the object has *strict* requirements on thread-safety. While the object can be initialized in the main WSGI thread, the ``run_in_threadpool`` method *must* be called from outside that thread. At that point, the main WSGI thread may only call specific methods. """ def __init__(self, stream_id, protocol): self.stream_id = stream_id self._protocol = protocol # Queue for data that has been received from the network. This is a # thread-safe queue, to allow both the WSGI application to block on # receiving more data and to allow the asyncio server to keep sending # more data. # # This queue is unbounded in size, but in practice it cannot contain # too much data because the flow control window doesn't get adjusted # unless data is removed from it. self._received_data = queue.Queue() # This buffer is used to hold partial chunks of data from # _received_data that were not returned out of ``read`` and friends. self._temp_buffer = b'' # Temporary variables that allow us to keep hold of the headers and # response status until such time as the application needs us to send # them. self._response_status = b'' self._response_headers = [] self._headers_emitted = False # Whether the application has received all the data from the network # or not. This allows us to short-circuit some reads. self._complete = False def receive_data(self, data, flow_controlled_size): """ Called by the H2Protocol when more data has been received from the network. Places the data directly on the queue in a thread-safe manner without blocking. Does not introspect or process the data. """ self._received_data.put_nowait((data, flow_controlled_size)) def request_complete(self): """ Called by the H2Protocol when all the request data has been received. This works by placing the ``END_DATA_SENTINEL`` on the queue. The reading code knows, when it sees the ``END_DATA_SENTINEL``, to expect no more data from the network. This ensures that the state of the application only changes when it has finished processing the data from the network, even though the server may have long-since finished receiving all the data for this request. """ self._received_data.put_nowait((END_DATA_SENTINEL, None)) def run_in_threadpool(self, wsgi_application, environ): """ This method should be invoked in a threadpool. At the point this method is invoked, the only safe methods to call from the original thread are ``receive_data`` and ``request_complete``: any other method is unsafe. This method handles the WSGI logic. It invokes the application callable in this thread, passing control over to the WSGI application. It then ensures that the data makes it back to the HTTP/2 connection via the thread-safe APIs provided below. """ result = wsgi_application(environ, self.start_response) try: for data in result: self.write(data) finally: # This signals that we're done with data. The server will know that # this allows it to clean up its state: we're done here. self.write(END_DATA_SENTINEL) # The next few methods are called by the WSGI application. Firstly, the # three methods provided by the input stream. def read(self, size=None): """ Called by the WSGI application to read data. This method is the one of two that explicitly pumps the input data queue, which means it deals with the ``_complete`` flag and the ``END_DATA_SENTINEL``. """ # If we've already seen the END_DATA_SENTINEL, return immediately. if self._complete: return b'' # If we've been asked to read everything, just iterate over ourselves. if size is None: return b''.join(self) # Otherwise, as long as we don't have enough data, spin looking for # another data chunk. data = b'' while len(data) < size: try: chunk = next(self) except StopIteration: break # Concatenating strings this way is slow, but that's ok, this is # just a demo. data += chunk # We have *at least* enough data to return, but we may have too much. # If we do, throw it on a buffer: we'll use it later. to_return = data[:size] self._temp_buffer = data[size:] return to_return def readline(self, hint=None): """ Called by the WSGI application to read a single line of data. This method rigorously observes the ``hint`` parameter: it will only ever read that much data. It then splits the data on a newline character and throws everything it doesn't need into a buffer. """ data = self.read(hint) first_newline = data.find(b'\n') if first_newline == -1: # No newline, return all the data return data # We want to slice the data so that the head *includes* the first # newline. Then, any data left in this line we don't care about should # be prepended to the internal buffer. head, tail = data[:first_newline + 1], data[first_newline + 1:] self._temp_buffer = tail + self._temp_buffer return head def readlines(self, hint=None): """ Called by the WSGI application to read several lines of data. """ data = self.read(hint) lines = data.splitlines(keepends=True) return lines def start_response(self, status, response_headers, exc_info=None): """ This is the PEP-3333 mandated start_response callable. All it does is store the headers for later sending, and return our ```write`` callable. """ if self._headers_emitted and exc_info is not None: raise exc_info[1].with_traceback(exc_info[2]) assert not self._response_status or exc_info is not None self._response_status = status self._response_headers = response_headers return self.write def write(self, data): """ Provides some data to write. This function *blocks* until such time as the data is allowed by HTTP/2 flow control. This allows a client to slow or pause the response as needed. This function is not supposed to be used, according to PEP-3333, but once we have it it becomes quite convenient to use it, so this app actually runs all writes through this function. """ if not self._headers_emitted: self._emit_headers() event = self._protocol.data_for_stream(self.stream_id, data) event.wait() return def _emit_headers(self): """ Sends the response headers. This is only called from the write callable and should only ever be called once. It does some minor processing (converts the status line into a status code because reason phrases are evil) and then passes the headers on to the server. This call explicitly blocks until the server notifies us that the headers have reached the network. """ assert self._response_status and self._response_headers assert not self._headers_emitted self._headers_emitted = True # We only need the status code status = self._response_status.split(" ", 1)[0] headers = [(":status", status)] headers.extend(self._response_headers) event = self._protocol.send_response(self.stream_id, headers) event.wait() return # These two methods implement the iterator protocol. This allows a WSGI # application to iterate over this Stream object to get the data. def __iter__(self): return self def __next__(self): # If the complete request has been read, abort immediately. if self._complete: raise StopIteration() # If we have data stored in a temporary buffer for any reason, return # that and clear the buffer. # # This can actually only happen when the application uses one of the # read* callables, but that's fine. if self._temp_buffer: buffered_data = self._temp_buffer self._temp_buffer = b'' return buffered_data # Otherwise, pull data off the queue (blocking as needed). If this is # the end of the request, we're done here: mark ourselves as complete # and call it time. Otherwise, open the flow control window an # appropriate amount and hand the chunk off. chunk, chunk_size = self._received_data.get() if chunk is END_DATA_SENTINEL: self._complete = True raise StopIteration() # Let's talk a little bit about why we're opening the flow control # window *here*, and not in the server thread. # # The purpose of HTTP/2 flow control is to allow for servers and # clients to avoid needing to buffer data indefinitely because their # peer is producing data faster than they can consume it. As a result, # it's important that the flow control window be opened as late in the # processing as possible. In this case, we open the flow control window # exactly when the server hands the data to the application. This means # that the flow control window essentially signals to the remote peer # how much data hasn't even been *seen* by the application yet. # # If you wanted to be really clever you could consider not opening the # flow control window until the application asks for the *next* chunk # of data. That means that any buffers at the application level are now # included in the flow control window processing. In my opinion, the # advantage of that process does not outweigh the extra logical # complexity involved in doing it, so we don't bother here. # # Another note: you'll notice that we don't include the _temp_buffer in # our flow control considerations. This means you could in principle # lead us to buffer slightly more than one connection flow control # window's worth of data. That risk is considered acceptable for the # much simpler logic available here. # # Finally, this is a pretty dumb flow control window management scheme: # it causes us to emit a *lot* of window updates. A smarter server # would want to use the content-length header to determine whether # flow control window updates need to be emitted at all, and then to be # more efficient about emitting them to avoid firing them off really # frequently. For an example like this, there's very little gained by # worrying about that. self._protocol.open_flow_control_window(self.stream_id, chunk_size) return chunk def _build_environ_dict(headers, stream): """ Build the WSGI environ dictionary for a given request. To do that, we'll temporarily create a dictionary for the headers. While this isn't actually a valid way to represent headers, we know that the special headers we need can only have one appearance in the block. This code is arguably somewhat incautious: the conversion to dictionary should only happen in a way that allows us to correctly join headers that appear multiple times. That's acceptable in a demo app: in a productised version you'd want to fix it. """ header_dict = dict(headers) path = header_dict.pop(':path') try: path, query = path.split('?', 1) except ValueError: query = "" server_name = header_dict.pop(':authority') try: server_name, port = server_name.split(':', 1) except ValueError: port = "8443" environ = { 'REQUEST_METHOD': header_dict.pop(':method'), 'SCRIPT_NAME': '', 'PATH_INFO': path, 'QUERY_STRING': query, 'SERVER_NAME': server_name, 'SERVER_PORT': port, 'SERVER_PROTOCOL': 'HTTP/2', 'HTTPS': "on", 'SSL_PROTOCOL': 'TLSv1.2', 'wsgi.version': (1, 0), 'wsgi.url_scheme': header_dict.pop(':scheme'), 'wsgi.input': stream, 'wsgi.errors': sys.stderr, 'wsgi.multithread': True, 'wsgi.multiprocess': False, 'wsgi.run_once': False, } if 'content-type' in header_dict: environ['CONTENT_TYPE'] = header_dict.pop('content-type') if 'content-length' in header_dict: environ['CONTENT_LENGTH'] = header_dict.pop('content-length') for name, value in header_dict.items(): environ['HTTP_' + name.upper()] = value return environ # Set up the WSGI app. application_string = sys.argv[1] path, func = application_string.split(':', 1) module = importlib.import_module(path) APPLICATION = getattr(module, func) # Set up TLS ssl_context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH) ssl_context.options |= ( ssl.OP_NO_TLSv1 | ssl.OP_NO_TLSv1_1 | ssl.OP_NO_COMPRESSION ) ssl_context.set_ciphers("ECDHE+AESGCM") ssl_context.load_cert_chain(certfile="cert.crt", keyfile="cert.key") ssl_context.set_alpn_protocols(["h2"]) # Do the asnycio bits loop = asyncio.get_event_loop() # Each client connection will create a new protocol instance coro = loop.create_server(H2Protocol, '127.0.0.1', 8443, ssl=ssl_context) server = loop.run_until_complete(coro) # Serve requests until Ctrl+C is pressed print('Serving on {}'.format(server.sockets[0].getsockname())) try: loop.run_forever() except KeyboardInterrupt: pass finally: # Close the server server.close() loop.run_until_complete(server.wait_closed()) loop.close() ././@PaxHeader0000000000000000000000000000003400000000000010212 xustar0028 mtime=1738482098.7623487 h2-4.2.0/examples/curio/0000755000076500000240000000000014747620663014345 5ustar00kriechistaff././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1579434623.0 h2-4.2.0/examples/curio/curio-server.py0000644000076500000240000001525013611041177017331 0ustar00kriechistaff#!/usr/bin/env python3.5 # -*- coding: utf-8 -*- """ curio-server.py ~~~~~~~~~~~~~~~ A fully-functional HTTP/2 server written for curio. Requires Python 3.5+. """ import mimetypes import os import sys from curio import Event, spawn, socket, ssl, run import h2.config import h2.connection import h2.events # The maximum amount of a file we'll send in a single DATA frame. READ_CHUNK_SIZE = 8192 async def create_listening_ssl_socket(address, certfile, keyfile): """ Create and return a listening TLS socket on a given address. """ ssl_context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH) ssl_context.options |= ( ssl.OP_NO_TLSv1 | ssl.OP_NO_TLSv1_1 | ssl.OP_NO_COMPRESSION ) ssl_context.set_ciphers("ECDHE+AESGCM") ssl_context.load_cert_chain(certfile=certfile, keyfile=keyfile) ssl_context.set_alpn_protocols(["h2"]) sock = socket.socket() sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1) sock = await ssl_context.wrap_socket(sock) sock.bind(address) sock.listen() return sock async def h2_server(address, root, certfile, keyfile): """ Create an HTTP/2 server at the given address. """ sock = await create_listening_ssl_socket(address, certfile, keyfile) print("Now listening on %s:%d" % address) async with sock: while True: client, _ = await sock.accept() server = H2Server(client, root) await spawn(server.run()) class H2Server: """ A basic HTTP/2 file server. This is essentially very similar to SimpleHTTPServer from the standard library, but uses HTTP/2 instead of HTTP/1.1. """ def __init__(self, sock, root): config = h2.config.H2Configuration( client_side=False, header_encoding='utf-8' ) self.sock = sock self.conn = h2.connection.H2Connection(config=config) self.root = root self.flow_control_events = {} async def run(self): """ Loop over the connection, managing it appropriately. """ self.conn.initiate_connection() await self.sock.sendall(self.conn.data_to_send()) while True: # 65535 is basically arbitrary here: this amounts to "give me # whatever data you have". data = await self.sock.recv(65535) if not data: break events = self.conn.receive_data(data) for event in events: if isinstance(event, h2.events.RequestReceived): await spawn( self.request_received(event.headers, event.stream_id) ) elif isinstance(event, h2.events.DataReceived): self.conn.reset_stream(event.stream_id) elif isinstance(event, h2.events.WindowUpdated): await self.window_updated(event) await self.sock.sendall(self.conn.data_to_send()) async def request_received(self, headers, stream_id): """ Handle a request by attempting to serve a suitable file. """ headers = dict(headers) assert headers[':method'] == 'GET' path = headers[':path'].lstrip('/') full_path = os.path.join(self.root, path) if not os.path.exists(full_path): response_headers = ( (':status', '404'), ('content-length', '0'), ('server', 'curio-h2'), ) self.conn.send_headers( stream_id, response_headers, end_stream=True ) await self.sock.sendall(self.conn.data_to_send()) else: await self.send_file(full_path, stream_id) async def send_file(self, file_path, stream_id): """ Send a file, obeying the rules of HTTP/2 flow control. """ filesize = os.stat(file_path).st_size content_type, content_encoding = mimetypes.guess_type(file_path) response_headers = [ (':status', '200'), ('content-length', str(filesize)), ('server', 'curio-h2'), ] if content_type: response_headers.append(('content-type', content_type)) if content_encoding: response_headers.append(('content-encoding', content_encoding)) self.conn.send_headers(stream_id, response_headers) await self.sock.sendall(self.conn.data_to_send()) with open(file_path, 'rb', buffering=0) as f: await self._send_file_data(f, stream_id) async def _send_file_data(self, fileobj, stream_id): """ Send the data portion of a file. Handles flow control rules. """ while True: while self.conn.local_flow_control_window(stream_id) < 1: await self.wait_for_flow_control(stream_id) chunk_size = min( self.conn.local_flow_control_window(stream_id), READ_CHUNK_SIZE, ) data = fileobj.read(chunk_size) keep_reading = (len(data) == chunk_size) self.conn.send_data(stream_id, data, not keep_reading) await self.sock.sendall(self.conn.data_to_send()) if not keep_reading: break async def wait_for_flow_control(self, stream_id): """ Blocks until the flow control window for a given stream is opened. """ evt = Event() self.flow_control_events[stream_id] = evt await evt.wait() async def window_updated(self, event): """ Unblock streams waiting on flow control, if needed. """ stream_id = event.stream_id if stream_id and stream_id in self.flow_control_events: evt = self.flow_control_events.pop(stream_id) await evt.set() elif not stream_id: # Need to keep a real list here to use only the events present at # this time. blocked_streams = list(self.flow_control_events.keys()) for stream_id in blocked_streams: event = self.flow_control_events.pop(stream_id) await event.set() return if __name__ == '__main__': host = sys.argv[2] if len(sys.argv) > 2 else "localhost" print("Try GETting:") print(" On OSX after 'brew install curl --with-c-ares --with-libidn --with-nghttp2 --with-openssl':") print("/usr/local/opt/curl/bin/curl --tlsv1.2 --http2 -k https://localhost:5000/bundle.js") print("Or open a browser to: https://localhost:5000/") print(" (Accept all the warnings)") run(h2_server((host, 5000), sys.argv[1], "{}.crt.pem".format(host), "{}.key".format(host)), with_monitor=True) ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1501439525.0 h2-4.2.0/examples/curio/localhost.crt.pem0000644000076500000240000000240113137423045017607 0ustar00kriechistaff-----BEGIN CERTIFICATE----- MIIDhTCCAm2gAwIBAgIJAOrxh0dOYJLdMA0GCSqGSIb3DQEBCwUAMFkxCzAJBgNV BAYTAkFVMRMwEQYDVQQIDApTb21lLVN0YXRlMSEwHwYDVQQKDBhJbnRlcm5ldCBX aWRnaXRzIFB0eSBMdGQxEjAQBgNVBAMMCWxvY2FsaG9zdDAeFw0xNTA5MTkxNDE2 NDRaFw0xNTEwMTkxNDE2NDRaMFkxCzAJBgNVBAYTAkFVMRMwEQYDVQQIDApTb21l LVN0YXRlMSEwHwYDVQQKDBhJbnRlcm5ldCBXaWRnaXRzIFB0eSBMdGQxEjAQBgNV BAMMCWxvY2FsaG9zdDCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMqt A1iu8EN00FU0eBcBGlLVmNEgV7Jkbukra+kwS8j/U2y50QPGJc/FiIVDfuBqk5dL ACTNc6A/FQcXvWmOc5ixmC3QKKasMpuofqKz0V9C6irZdYXZ9rcsW0gHQIr989yd R+N1VbIlEVW/T9FJL3B2UD9GVIkUELzm47CSOWZvAxQUlsx8CUNuUCWqyZJoqTFN j0LeJDOWGCsug1Pkj0Q1x+jMVL6l6Zf6vMkLNOMsOsWsxUk+0L3tl/OzcTgUOCsw UzY59RIi6Rudrp0oaU8NuHr91yiSqPbKFlX10M9KwEEdnIpcxhND3dacrDycj3ux eWlqKync2vOFUkhwiaMCAwEAAaNQME4wHQYDVR0OBBYEFA0PN+PGoofZ+QIys2Jy 1Zz94vBOMB8GA1UdIwQYMBaAFA0PN+PGoofZ+QIys2Jy1Zz94vBOMAwGA1UdEwQF MAMBAf8wDQYJKoZIhvcNAQELBQADggEBAEplethBoPpcP3EbR5Rz6snDDIcbtAJu Ngd0YZppGT+P0DYnPJva4vRG3bb84ZMSuppz5j67qD6DdWte8UXhK8BzWiHzwmQE QmbKyzzTMKQgTNFntpx5cgsSvTtrHpNYoMHzHOmyAOboNeM0DWiRXsYLkWTitLTN qbOpstwPubExbT9lPjLclntShT/lCupt+zsbnrR9YiqlYFY/fDzfAybZhrD5GMBY XdMPItwAc/sWvH31yztarjkLmld76AGCcO5r8cSR/cX98SicyfjOBbSco8GkjYNY 582gTPkKGYpStuN7GNT5tZmxvMq935HRa2XZvlAIe8ufp8EHVoYiF3c= -----END CERTIFICATE----- ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1501439525.0 h2-4.2.0/examples/curio/localhost.key0000644000076500000240000000321713137423045017035 0ustar00kriechistaff-----BEGIN RSA PRIVATE KEY----- MIIEpAIBAAKCAQEAyq0DWK7wQ3TQVTR4FwEaUtWY0SBXsmRu6Str6TBLyP9TbLnR A8Ylz8WIhUN+4GqTl0sAJM1zoD8VBxe9aY5zmLGYLdAopqwym6h+orPRX0LqKtl1 hdn2tyxbSAdAiv3z3J1H43VVsiURVb9P0UkvcHZQP0ZUiRQQvObjsJI5Zm8DFBSW zHwJQ25QJarJkmipMU2PQt4kM5YYKy6DU+SPRDXH6MxUvqXpl/q8yQs04yw6xazF ST7Qve2X87NxOBQ4KzBTNjn1EiLpG52unShpTw24ev3XKJKo9soWVfXQz0rAQR2c ilzGE0Pd1pysPJyPe7F5aWorKdza84VSSHCJowIDAQABAoIBACp+nh4BB/VMz8Wd q7Q/EfLeQB1Q57JKpoqTBRwueSVai3ZXe4CMEi9/HkG6xiZtkiZ9njkZLq4hq9oB 2z//kzMnwV2RsIRJxI6ohGy+wR51HD4BvEdlTPpY/Yabpqe92VyfSYxidKZWaU0O QMED1EODOw4ZQ+4928iPrJu//PMB4e7TFao0b9Fk/XLWtu5/tQZz9jsrlTi1zthh 7n+oaGNhfTeIJJL4jrhTrKW1CLHXATtr9SJlfZ3wbMxQVeyj2wUlP1V0M6kBuhNj tbGbMpixD5iCNJ49Cm2PHg+wBOfS3ADGIpi3PcGw5mb8nB3N9eGBRPhLShAlq5Hi Lv4tyykCgYEA8u3b3xJ04pxWYN25ou/Sc8xzgDCK4XvDNdHVTuZDjLVA+VTVPzql lw7VvJArsx47MSPvsaX/+4hQXYtfnR7yJpx6QagvQ+z4ludnIZYrQwdUmb9pFL1s 8UNj+3j9QFRPenIiIQ8qxxNIQ9w2HsVQ8scvc9CjYop/YYAPaQyHaL8CgYEA1ZSz CR4NcpfgRSILdhb1dLcyw5Qus1VOSAx3DYkhDkMiB8XZwgMdJjwehJo9yaqRCLE8 Sw5znMnkfoZpu7+skrjK0FqmMpXMH9gIszHvFG8wSw/6+2HIWS19/wOu8dh95LuC 0zurMk8rFqxgWMWF20afhgYrUz42cvUTo10FVB0CgYEAt7mW6W3PArfUSCxIwmb4 VmXREKkl0ATHDYQl/Cb//YHzot467TgQll883QB4XF5HzBFurX9rSzO7/BN1e6I0 52i+ubtWC9xD4fUetXMaQvZfUGxIL8xXgVxDWKQXfLiG54c8Mp6C7s6xf8kjEUCP yR1F0SSA/Pzb+8RbY0p7eocCgYA+1rs+SXtHZev0KyoYGnUpW+Uxqd17ofOgOxqj /t6c5Z+TjeCdtnDTGQkZlo/rT6XQWuUUaDIXxUbW+xEMzj4mBPyXBLS1WWFvVQ5q OpzO9E/PJeqAH6rkof/aEelc+oc/zvOU1o9uA+D3kMvgEm1psIOq2RHSMhGvDPA0 NmAk+QKBgQCwd1681GagdIYSZUCBecnLtevXmIsJyDW2yR1NNcIe/ukcVQREMDvy 5DDkhnGDgnV1D5gYcXb34g9vYvbfTnBMl/JXmMAAG1kIS+3pvHyN6f1poVe3yJV1 yHVuvymnJxKnyaV0L3ntepVvV0vVNIkA3oauoUTLto6txBI+b/ImDA== -----END RSA PRIVATE KEY----- ././@PaxHeader0000000000000000000000000000003400000000000010212 xustar0028 mtime=1738482098.7628403 h2-4.2.0/examples/eventlet/0000755000076500000240000000000014747620663015052 5ustar00kriechistaff././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1547980376.0 h2-4.2.0/examples/eventlet/eventlet-server.py0000644000076500000240000000544313421047130020540 0ustar00kriechistaff# -*- coding: utf-8 -*- """ eventlet-server.py ~~~~~~~~~~~~~~~~~~ A fully-functional HTTP/2 server written for Eventlet. """ import collections import json import eventlet from eventlet.green.OpenSSL import SSL, crypto from h2.config import H2Configuration from h2.connection import H2Connection from h2.events import RequestReceived, DataReceived class ConnectionManager(object): """ An object that manages a single HTTP/2 connection. """ def __init__(self, sock): config = H2Configuration(client_side=False) self.sock = sock self.conn = H2Connection(config=config) def run_forever(self): self.conn.initiate_connection() self.sock.sendall(self.conn.data_to_send()) while True: data = self.sock.recv(65535) if not data: break events = self.conn.receive_data(data) for event in events: if isinstance(event, RequestReceived): self.request_received(event.headers, event.stream_id) elif isinstance(event, DataReceived): self.conn.reset_stream(event.stream_id) self.sock.sendall(self.conn.data_to_send()) def request_received(self, headers, stream_id): headers = collections.OrderedDict(headers) data = json.dumps({'headers': headers}, indent=4).encode('utf-8') response_headers = ( (':status', '200'), ('content-type', 'application/json'), ('content-length', str(len(data))), ('server', 'eventlet-h2'), ) self.conn.send_headers(stream_id, response_headers) self.conn.send_data(stream_id, data, end_stream=True) def alpn_callback(conn, protos): if b'h2' in protos: return b'h2' raise RuntimeError("No acceptable protocol offered!") def npn_advertise_cb(conn): return [b'h2'] # Let's set up SSL. This is a lot of work in PyOpenSSL. options = ( SSL.OP_NO_COMPRESSION | SSL.OP_NO_SSLv2 | SSL.OP_NO_SSLv3 | SSL.OP_NO_TLSv1 | SSL.OP_NO_TLSv1_1 ) context = SSL.Context(SSL.SSLv23_METHOD) context.set_options(options) context.set_verify(SSL.VERIFY_NONE, lambda *args: True) context.use_privatekey_file('server.key') context.use_certificate_file('server.crt') context.set_npn_advertise_callback(npn_advertise_cb) context.set_alpn_select_callback(alpn_callback) context.set_cipher_list( "ECDHE+AESGCM" ) context.set_tmp_ecdh(crypto.get_elliptic_curve(u'prime256v1')) server = eventlet.listen(('0.0.0.0', 443)) server = SSL.Connection(context, server) pool = eventlet.GreenPool() while True: try: new_sock, _ = server.accept() manager = ConnectionManager(new_sock) pool.spawn_n(manager.run_forever) except (SystemExit, KeyboardInterrupt): break ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1501439525.0 h2-4.2.0/examples/eventlet/server.crt0000644000076500000240000000227413137423045017062 0ustar00kriechistaff-----BEGIN CERTIFICATE----- MIIDUjCCAjoCCQCQmNzzpQTCijANBgkqhkiG9w0BAQUFADBrMQswCQYDVQQGEwJH QjEPMA0GA1UECBMGTG9uZG9uMQ8wDQYDVQQHEwZMb25kb24xETAPBgNVBAoTCGh5 cGVyLWgyMREwDwYDVQQLEwhoeXBleS1oMjEUMBIGA1UEAxMLZXhhbXBsZS5jb20w HhcNMTUwOTE2MjAyOTA0WhcNMTYwOTE1MjAyOTA0WjBrMQswCQYDVQQGEwJHQjEP MA0GA1UECBMGTG9uZG9uMQ8wDQYDVQQHEwZMb25kb24xETAPBgNVBAoTCGh5cGVy LWgyMREwDwYDVQQLEwhoeXBleS1oMjEUMBIGA1UEAxMLZXhhbXBsZS5jb20wggEi MA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQC74ZeB4Jdb5cnC9KXXLJuzjwTg 45q5EeShDYQe0TbKgreiUP6clU3BR0fFAVedN1q/LOuQ1HhvrDk1l4TfGF2bpCIq K+U9CnzcQknvdpyyVeOLtSsCjOPk4xydHwkQxwJvHVdtJx4CzDDqGbHNHCF/9gpQ lsa3JZW+tIZLK0XMEPFQ4XFXgegxTStO7kBBPaVIgG9Ooqc2MG4rjMNUpxa28WF1 SyqWTICf2N8T/C+fPzbQLKCWrFrKUP7WQlOaqPNQL9bCDhSTPRTwQOc2/MzVZ9gT Xr0Z+JMTXwkSMKO52adE1pmKt00jJ1ecZBiJFyjx0X6hH+/59dLbG/7No+PzAgMB AAEwDQYJKoZIhvcNAQEFBQADggEBAG3UhOCa0EemL2iY+C+PR6CwEHQ+n7vkBzNz gKOG+Q39spyzqU1qJAzBxLTE81bIQbDg0R8kcLWHVH2y4zViRxZ0jHUFKMgjONW+ Aj4evic/2Y/LxpLxCajECq/jeMHYrmQONszf9pbc0+exrQpgnwd8asfsM3d/FJS2 5DIWryCKs/61m9vYL8icWx/9cnfPkBoNv1ER+V1L1TH3ARvABh406SBaeqLTm/kG MNuKytKWJsQbNlxzWHVgkKzVsBKvYj0uIEJpClIhbe6XNYRDy8T8mKXVWhJuxH4p /agmCG3nxO8aCrUK/EVmbWmVIfCH3t7jlwMX1nJ8MsRE7Ydnk8I= -----END CERTIFICATE----- ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1501439525.0 h2-4.2.0/examples/eventlet/server.key0000644000076500000240000000321713137423045017060 0ustar00kriechistaff-----BEGIN RSA PRIVATE KEY----- MIIEpQIBAAKCAQEAu+GXgeCXW+XJwvSl1yybs48E4OOauRHkoQ2EHtE2yoK3olD+ nJVNwUdHxQFXnTdavyzrkNR4b6w5NZeE3xhdm6QiKivlPQp83EJJ73acslXji7Ur Aozj5OMcnR8JEMcCbx1XbSceAsww6hmxzRwhf/YKUJbGtyWVvrSGSytFzBDxUOFx V4HoMU0rTu5AQT2lSIBvTqKnNjBuK4zDVKcWtvFhdUsqlkyAn9jfE/wvnz820Cyg lqxaylD+1kJTmqjzUC/Wwg4Ukz0U8EDnNvzM1WfYE169GfiTE18JEjCjudmnRNaZ irdNIydXnGQYiRco8dF+oR/v+fXS2xv+zaPj8wIDAQABAoIBAQCsdq278+0c13d4 tViSh4k5r1w8D9IUdp9XU2/nVgckqA9nOVAvbkJc3FC+P7gsQgbUHKj0XoVbhU1S q461t8kduPH/oiGhAcKR8WurHEdE0OC6ewhLJAeCMRQwCrAorXXHh7icIt9ClCuG iSWUcXEy5Cidx3oL3r1xvIbV85fzdDtE9RC1I/kMjAy63S47YGiqh5vYmJkCa8rG Dsd1sEMDPr63XJpqJj3uHRcPvySgXTa+ssTmUH8WJlPTjvDB5hnPz+lkk2JKVPNu 8adzftZ6hSun+tsc4ZJp8XhGu/m/7MjxWh8MeupLHlXcOEsnj4uHQQsOM3zHojr3 aDCZiC1pAoGBAOAhwe1ujoS2VJ5RXJ9KMs7eBER/02MDgWZjo54Jv/jFxPWGslKk QQceuTe+PruRm41nzvk3q4iZXt8pG0bvpgigN2epcVx/O2ouRsUWWBT0JrVlEzha TIvWjtZ5tSQExXgHL3VlM9+ka40l+NldLSPn25+prizaqhalWuvTpP23AoGBANaY VhEI6yhp0BBUSATEv9lRgkwx3EbcnXNXPQjDMOthsyfq7FxbdOBEK1rwSDyuE6Ij zQGcTOfdiur5Ttg0OQilTJIXJAlpoeecOQ9yGma08c5FMXVJJvcZUuWRZWg1ocQj /hx0WVE9NwOoKwTBERv8HX7vJOFRZyvgkJwFxoulAoGAe4m/1XoZrga9z2GzNs10 AdgX7BW00x+MhH4pIiPnn1yK+nYa9jg4647Asnv3IfXZEnEEgRNxReKbi0+iDFBt aNW+lDGuHTi37AfD1EBDnpEQgO1MUcRb6rwBkTAWatsCaO00+HUmyX9cFLm4Vz7n caILyQ6CxZBlLgRIgDHxADMCgYEAtubsJGTHmZBmSCStpXLUWbOBLNQqfTM398DZ QoirP1PsUQ+IGUfSG/u+QCogR6fPEBkXeFHxsoY/Cvsm2lvYaKgK1VFn46Xm2vNq JuIH4pZCqp6LAv4weddZslT0a5eaowRSZ4o7PmTAaRuCXvD3VjTSJwhJFMo+90TV vEWn7gkCgYEAkk+unX9kYmKoUdLh22/tzQekBa8WqMxXDwzBCECTAs2GlpL/f73i zD15TnaNfLP6Q5RNb0N9tb0Gz1wSkwI1+jGAQLnh2K9X9cIVIqJn8Mf/KQa/wUDV Tb1j7FoGUEgX7vbsyWuTd8P76kNYyGqCss1XmbttcSolqpbIdlSUcO0= -----END RSA PRIVATE KEY----- ././@PaxHeader0000000000000000000000000000003400000000000010212 xustar0028 mtime=1738482098.7632942 h2-4.2.0/examples/fragments/0000755000076500000240000000000014747620663015212 5ustar00kriechistaff././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1579434623.0 h2-4.2.0/examples/fragments/client_https_setup_fragment.py0000644000076500000240000000745713611041177023366 0ustar00kriechistaff# -*- coding: utf-8 -*- """ Client HTTPS Setup ~~~~~~~~~~~~~~~~~~ This example code fragment demonstrates how to set up a HTTP/2 client that negotiates HTTP/2 using NPN and ALPN. For the sake of maximum explanatory value this code uses the synchronous, low-level sockets API: however, if you're not using sockets directly (e.g. because you're using asyncio), you should focus on the set up required for the SSLContext object. For other concurrency libraries you may need to use other setup (e.g. for Twisted you'll need to use IProtocolNegotiationFactory). This code requires Python 3.5 or later. """ import h2.connection import socket import ssl def establish_tcp_connection(): """ This function establishes a client-side TCP connection. How it works isn't very important to this example. For the purpose of this example we connect to localhost. """ return socket.create_connection(('localhost', 443)) def get_http2_ssl_context(): """ This function creates an SSLContext object that is suitably configured for HTTP/2. If you're working with Python TLS directly, you'll want to do the exact same setup as this function does. """ # Get the basic context from the standard library. ctx = ssl.create_default_context(purpose=ssl.Purpose.SERVER_AUTH) # RFC 7540 Section 9.2: Implementations of HTTP/2 MUST use TLS version 1.2 # or higher. Disable TLS 1.1 and lower. ctx.options |= ( ssl.OP_NO_SSLv2 | ssl.OP_NO_SSLv3 | ssl.OP_NO_TLSv1 | ssl.OP_NO_TLSv1_1 ) # RFC 7540 Section 9.2.1: A deployment of HTTP/2 over TLS 1.2 MUST disable # compression. ctx.options |= ssl.OP_NO_COMPRESSION # RFC 7540 Section 9.2.2: "deployments of HTTP/2 that use TLS 1.2 MUST # support TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256". In practice, the # blocklist defined in this section allows only the AES GCM and ChaCha20 # cipher suites with ephemeral key negotiation. ctx.set_ciphers("ECDHE+AESGCM:ECDHE+CHACHA20:DHE+AESGCM:DHE+CHACHA20") # We want to negotiate using NPN and ALPN. ALPN is mandatory, but NPN may # be absent, so allow that. This setup allows for negotiation of HTTP/1.1. ctx.set_alpn_protocols(["h2", "http/1.1"]) try: ctx.set_npn_protocols(["h2", "http/1.1"]) except NotImplementedError: pass return ctx def negotiate_tls(tcp_conn, context): """ Given an established TCP connection and a HTTP/2-appropriate TLS context, this function: 1. wraps TLS around the TCP connection. 2. confirms that HTTP/2 was negotiated and, if it was not, throws an error. """ # Note that SNI is mandatory for HTTP/2, so you *must* pass the # server_hostname argument. tls_conn = context.wrap_socket(tcp_conn, server_hostname='localhost') # Always prefer the result from ALPN to that from NPN. # You can only check what protocol was negotiated once the handshake is # complete. negotiated_protocol = tls_conn.selected_alpn_protocol() if negotiated_protocol is None: negotiated_protocol = tls_conn.selected_npn_protocol() if negotiated_protocol != "h2": raise RuntimeError("Didn't negotiate HTTP/2!") return tls_conn def main(): # Step 1: Set up your TLS context. context = get_http2_ssl_context() # Step 2: Create a TCP connection. connection = establish_tcp_connection() # Step 3: Wrap the connection in TLS and validate that we negotiated HTTP/2 tls_connection = negotiate_tls(connection, context) # Step 4: Create a client-side H2 connection. http2_connection = h2.connection.H2Connection() # Step 5: Initiate the connection http2_connection.initiate_connection() tls_connection.sendall(http2_connection.data_to_send()) # The TCP, TLS, and HTTP/2 handshakes are now complete. You can enter your # main loop now. ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737582431.0 h2-4.2.0/examples/fragments/client_upgrade_fragment.py0000644000076500000240000000721714744263537022443 0ustar00kriechistaff# -*- coding: utf-8 -*- """ Client Plaintext Upgrade ~~~~~~~~~~~~~~~~~~~~~~~~ This example code fragment demonstrates how to set up a HTTP/2 client that uses the plaintext HTTP Upgrade mechanism to negotiate HTTP/2 connectivity. For maximum explanatory value it uses the synchronous socket API that comes with the Python standard library. In product code you will want to use an actual HTTP/1.1 client if possible. This code requires Python 3.5 or later. """ import h2.connection import socket def establish_tcp_connection(): """ This function establishes a client-side TCP connection. How it works isn't very important to this example. For the purpose of this example we connect to localhost. """ return socket.create_connection(('localhost', 80)) def send_initial_request(connection, settings): """ For the sake of this upgrade demonstration, we're going to issue a GET request against the root of the site. In principle the best request to issue for an upgrade is actually ``OPTIONS *``, but this is remarkably poorly supported and can break in weird ways. """ # Craft our initial request per RFC 7540 Section 3.2. This requires two # special header fields: the Upgrade headre, and the HTTP2-Settings header. # The value of the HTTP2-Settings header field comes from h2. request = ( b"GET / HTTP/1.1\r\n" + b"Host: localhost\r\n" + b"Upgrade: h2c\r\n" + b"HTTP2-Settings: " + settings + b"\r\n" + b"\r\n" ) connection.sendall(request) def get_upgrade_response(connection): """ This function reads from the socket until the HTTP/1.1 end-of-headers sequence (CRLFCRLF) is received. It then checks what the status code of the response is. This is not a substitute for proper HTTP/1.1 parsing, but it's good enough for example purposes. """ data = b'' while b'\r\n\r\n' not in data: data += connection.recv(8192) headers, rest = data.split(b'\r\n\r\n', 1) # An upgrade response begins HTTP/1.1 101 Switching Protocols. Look for the # code. In production code you should also check that the upgrade is to # h2c, but here we know we only offered one upgrade so there's only one # possible upgrade in use. split_headers = headers.split() if split_headers[1] != b'101': raise RuntimeError("Not upgrading!") # We don't care about the HTTP/1.1 data anymore, but we do care about # any other data we read from the socket: this is going to be HTTP/2 data # that must be passed to the H2Connection. return rest def main(): """ The client upgrade flow. """ # Step 1: Establish the TCP connection. connection = establish_tcp_connection() # Step 2: Create H2 Connection object, put it in upgrade mode, and get the # value of the HTTP2-Settings header we want to use. h2_connection = h2.connection.H2Connection() settings_header_value = h2_connection.initiate_upgrade_connection() # Step 3: Send the initial HTTP/1.1 request with the upgrade fields. send_initial_request(connection, settings_header_value) # Step 4: Read the HTTP/1.1 response, look for 101 response. extra_data = get_upgrade_response(connection) # Step 5: Immediately send the pending HTTP/2 data. connection.sendall(h2_connection.data_to_send()) # Step 6: Feed the body data to the connection. events = connection.receive_data(extra_data) # Now you can enter your main loop, beginning by processing the first set # of events above. These events may include ResponseReceived, which will # contain the response to the request we made in Step 3. main_loop(events) ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1579434623.0 h2-4.2.0/examples/fragments/server_https_setup_fragment.py0000644000076500000240000000744313611041177023411 0ustar00kriechistaff# -*- coding: utf-8 -*- """ Server HTTPS Setup ~~~~~~~~~~~~~~~~~~ This example code fragment demonstrates how to set up a HTTP/2 server that negotiates HTTP/2 using NPN and ALPN. For the sake of maximum explanatory value this code uses the synchronous, low-level sockets API: however, if you're not using sockets directly (e.g. because you're using asyncio), you should focus on the set up required for the SSLContext object. For other concurrency libraries you may need to use other setup (e.g. for Twisted you'll need to use IProtocolNegotiationFactory). This code requires Python 3.5 or later. """ import h2.config import h2.connection import socket import ssl def establish_tcp_connection(): """ This function establishes a server-side TCP connection. How it works isn't very important to this example. """ bind_socket = socket.socket() bind_socket.bind(('', 443)) bind_socket.listen(5) return bind_socket.accept()[0] def get_http2_ssl_context(): """ This function creates an SSLContext object that is suitably configured for HTTP/2. If you're working with Python TLS directly, you'll want to do the exact same setup as this function does. """ # Get the basic context from the standard library. ctx = ssl.create_default_context(purpose=ssl.Purpose.CLIENT_AUTH) # RFC 7540 Section 9.2: Implementations of HTTP/2 MUST use TLS version 1.2 # or higher. Disable TLS 1.1 and lower. ctx.options |= ( ssl.OP_NO_SSLv2 | ssl.OP_NO_SSLv3 | ssl.OP_NO_TLSv1 | ssl.OP_NO_TLSv1_1 ) # RFC 7540 Section 9.2.1: A deployment of HTTP/2 over TLS 1.2 MUST disable # compression. ctx.options |= ssl.OP_NO_COMPRESSION # RFC 7540 Section 9.2.2: "deployments of HTTP/2 that use TLS 1.2 MUST # support TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256". In practice, the # blocklist defined in this section allows only the AES GCM and ChaCha20 # cipher suites with ephemeral key negotiation. ctx.set_ciphers("ECDHE+AESGCM:ECDHE+CHACHA20:DHE+AESGCM:DHE+CHACHA20") # We want to negotiate using NPN and ALPN. ALPN is mandatory, but NPN may # be absent, so allow that. This setup allows for negotiation of HTTP/1.1. ctx.set_alpn_protocols(["h2", "http/1.1"]) try: ctx.set_npn_protocols(["h2", "http/1.1"]) except NotImplementedError: pass return ctx def negotiate_tls(tcp_conn, context): """ Given an established TCP connection and a HTTP/2-appropriate TLS context, this function: 1. wraps TLS around the TCP connection. 2. confirms that HTTP/2 was negotiated and, if it was not, throws an error. """ tls_conn = context.wrap_socket(tcp_conn, server_side=True) # Always prefer the result from ALPN to that from NPN. # You can only check what protocol was negotiated once the handshake is # complete. negotiated_protocol = tls_conn.selected_alpn_protocol() if negotiated_protocol is None: negotiated_protocol = tls_conn.selected_npn_protocol() if negotiated_protocol != "h2": raise RuntimeError("Didn't negotiate HTTP/2!") return tls_conn def main(): # Step 1: Set up your TLS context. context = get_http2_ssl_context() # Step 2: Receive a TCP connection. connection = establish_tcp_connection() # Step 3: Wrap the connection in TLS and validate that we negotiated HTTP/2 tls_connection = negotiate_tls(connection, context) # Step 4: Create a server-side H2 connection. config = h2.config.H2Configuration(client_side=False) http2_connection = h2.connection.H2Connection(config=config) # Step 5: Initiate the connection http2_connection.initiate_connection() tls_connection.sendall(http2_connection.data_to_send()) # The TCP, TLS, and HTTP/2 handshakes are now complete. You can enter your # main loop now. ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737582431.0 h2-4.2.0/examples/fragments/server_upgrade_fragment.py0000644000076500000240000000611614744263537022470 0ustar00kriechistaff# -*- coding: utf-8 -*- """ Server Plaintext Upgrade ~~~~~~~~~~~~~~~~~~~~~~~~ This example code fragment demonstrates how to set up a HTTP/2 server that uses the plaintext HTTP Upgrade mechanism to negotiate HTTP/2 connectivity. For maximum explanatory value it uses the synchronous socket API that comes with the Python standard library. In product code you will want to use an actual HTTP/1.1 server library if possible. This code requires Python 3.5 or later. """ import h2.config import h2.connection import re import socket def establish_tcp_connection(): """ This function establishes a server-side TCP connection. How it works isn't very important to this example. """ bind_socket = socket.socket() bind_socket.bind(('', 443)) bind_socket.listen(5) return bind_socket.accept()[0] def receive_initial_request(connection): """ We're going to receive a request. For the sake of this example, we're going to assume that the first request has no body. If it doesn't have the Upgrade: h2c header field and the HTTP2-Settings header field, we'll throw errors. In production code, you should use a proper HTTP/1.1 parser and actually serve HTTP/1.1 requests! Returns the value of the HTTP2-Settings header field. """ data = b'' while not data.endswith(b'\r\n\r\n'): data += connection.recv(8192) match = re.search(b'Upgrade: h2c\r\n', data) if match is None: raise RuntimeError("HTTP/2 upgrade not requested!") # We need to look for the HTTP2-Settings header field. Again, in production # code you shouldn't use regular expressions for this, but it's good enough # for the example. match = re.search(b'HTTP2-Settings: (\\S+)\r\n', data) if match is None: raise RuntimeError("HTTP2-Settings header field not present!") return match.group(1) def send_upgrade_response(connection): """ This function writes the 101 Switching Protocols response. """ response = ( b"HTTP/1.1 101 Switching Protocols\r\n" b"Upgrade: h2c\r\n" b"\r\n" ) connection.sendall(response) def main(): """ The server upgrade flow. """ # Step 1: Establish the TCP connection. connection = establish_tcp_connection() # Step 2: Read the response. We expect this to request an upgrade. settings_header_value = receive_initial_request(connection) # Step 3: Create a H2Connection object in server mode, and pass it the # value of the HTTP2-Settings header field. config = h2.config.H2Configuration(client_side=False) h2_connection = h2.connection.H2Connection(config=config) h2_connection.initiate_upgrade_connection( settings_header=settings_header_value ) # Step 4: Send the 101 Switching Protocols response. send_upgrade_response(connection) # Step 5: Send pending HTTP/2 data. connection.sendall(h2_connection.data_to_send()) # At this point, you can enter your main loop. The first step has to be to # send the response to the initial HTTP/1.1 request you received on stream # 1. main_loop() ././@PaxHeader0000000000000000000000000000003400000000000010212 xustar0028 mtime=1738482098.7637086 h2-4.2.0/examples/gevent/0000755000076500000240000000000014747620663014514 5ustar00kriechistaff././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1597496595.0 h2-4.2.0/examples/gevent/gevent-server.py0000644000076500000240000001477113715756423017672 0ustar00kriechistaff# -*- coding: utf-8 -*- """ gevent-server.py ================ A simple HTTP/2 server written for gevent serving static files from a directory specified as input. If no directory is provided, the current directory will be used. """ import mimetypes import sys from functools import partial from pathlib import Path from typing import Tuple, Dict, Optional from gevent import socket, ssl from gevent.event import Event from gevent.server import StreamServer from h2 import events from h2.config import H2Configuration from h2.connection import H2Connection def get_http2_tls_context() -> ssl.SSLContext: ctx = ssl.create_default_context(purpose=ssl.Purpose.CLIENT_AUTH) ctx.options |= ( ssl.OP_NO_SSLv2 | ssl.OP_NO_SSLv3 | ssl.OP_NO_TLSv1 | ssl.OP_NO_TLSv1_1 ) ctx.options |= ssl.OP_NO_COMPRESSION ctx.set_ciphers('ECDHE+AESGCM:ECDHE+CHACHA20:DHE+AESGCM:DHE+CHACHA20') ctx.load_cert_chain(certfile='localhost.crt', keyfile='localhost.key') ctx.set_alpn_protocols(['h2']) try: ctx.set_npn_protocols(['h2']) except NotImplementedError: pass return ctx class H2Worker: def __init__(self, sock: socket, address: Tuple[str, str], source_dir: str = None): self._sock = sock self._address = address self._flow_control_events: Dict[int, Event] = {} self._server_name = 'gevent-h2' self._connection: Optional[H2Connection] = None self._read_chunk_size = 8192 # The maximum amount of a file we'll send in a single DATA frame self._check_sources_dir(source_dir) self._sources_dir = source_dir self._run() def _initiate_connection(self): config = H2Configuration(client_side=False, header_encoding='utf-8') self._connection = H2Connection(config=config) self._connection.initiate_connection() self._sock.sendall(self._connection.data_to_send()) @staticmethod def _check_sources_dir(sources_dir: str) -> None: p = Path(sources_dir) if not p.is_dir(): raise NotADirectoryError(f'{sources_dir} does not exists') def _send_error_response(self, status_code: str, event: events.RequestReceived) -> None: self._connection.send_headers( stream_id=event.stream_id, headers=[ (':status', status_code), ('content-length', '0'), ('server', self._server_name), ], end_stream=True ) self._sock.sendall(self._connection.data_to_send()) def _handle_request(self, event: events.RequestReceived) -> None: headers = dict(event.headers) if headers[':method'] != 'GET': self._send_error_response('405', event) return file_path = Path(self._sources_dir) / headers[':path'].lstrip('/') if not file_path.is_file(): self._send_error_response('404', event) return self._send_file(file_path, event.stream_id) def _send_file(self, file_path: Path, stream_id: int) -> None: """ Send a file, obeying the rules of HTTP/2 flow control. """ file_size = file_path.stat().st_size content_type, content_encoding = mimetypes.guess_type(str(file_path)) response_headers = [ (':status', '200'), ('content-length', str(file_size)), ('server', self._server_name) ] if content_type: response_headers.append(('content-type', content_type)) if content_encoding: response_headers.append(('content-encoding', content_encoding)) self._connection.send_headers(stream_id, response_headers) self._sock.sendall(self._connection.data_to_send()) with file_path.open(mode='rb', buffering=0) as f: self._send_file_data(f, stream_id) def _send_file_data(self, file_obj, stream_id: int) -> None: """ Send the data portion of a file. Handles flow control rules. """ while True: while self._connection.local_flow_control_window(stream_id) < 1: self._wait_for_flow_control(stream_id) chunk_size = min(self._connection.local_flow_control_window(stream_id), self._read_chunk_size) data = file_obj.read(chunk_size) keep_reading = (len(data) == chunk_size) self._connection.send_data(stream_id, data, not keep_reading) self._sock.sendall(self._connection.data_to_send()) if not keep_reading: break def _wait_for_flow_control(self, stream_id: int) -> None: """ Blocks until the flow control window for a given stream is opened. """ event = Event() self._flow_control_events[stream_id] = event event.wait() def _handle_window_update(self, event: events.WindowUpdated) -> None: """ Unblock streams waiting on flow control, if needed. """ stream_id = event.stream_id if stream_id and stream_id in self._flow_control_events: g_event = self._flow_control_events.pop(stream_id) g_event.set() elif not stream_id: # Need to keep a real list here to use only the events present at this time. blocked_streams = list(self._flow_control_events.keys()) for stream_id in blocked_streams: g_event = self._flow_control_events.pop(stream_id) g_event.set() def _run(self) -> None: self._initiate_connection() while True: data = self._sock.recv(65535) if not data: break h2_events = self._connection.receive_data(data) for event in h2_events: if isinstance(event, events.RequestReceived): self._handle_request(event) elif isinstance(event, events.DataReceived): self._connection.reset_stream(event.stream_id) elif isinstance(event, events.WindowUpdated): self._handle_window_update(event) data_to_send = self._connection.data_to_send() if data_to_send: self._sock.sendall(data_to_send) if __name__ == '__main__': files_dir = sys.argv[1] if len(sys.argv) > 1 else f'{Path().cwd()}' server = StreamServer(('127.0.0.1', 8080), partial(H2Worker, source_dir=files_dir), ssl_context=get_http2_tls_context()) try: server.serve_forever() except KeyboardInterrupt: server.close() ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1597496595.0 h2-4.2.0/examples/gevent/localhost.crt0000644000076500000240000000227713715756423017224 0ustar00kriechistaff-----BEGIN CERTIFICATE----- MIIDVDCCAjwCCQC1RoAIsDX89zANBgkqhkiG9w0BAQsFADBsMQswCQYDVQQGEwJG UjEWMBQGA1UECAwNSWxlLWRlLUZyYW5jZTEOMAwGA1UEBwwFUGFyaXMxITAfBgNV BAoMGEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDESMBAGA1UEAwwJbG9jYWxob3N0 MB4XDTE5MDgzMDAzNDcwN1oXDTIwMDgyOTAzNDcwN1owbDELMAkGA1UEBhMCRlIx FjAUBgNVBAgMDUlsZS1kZS1GcmFuY2UxDjAMBgNVBAcMBVBhcmlzMSEwHwYDVQQK DBhJbnRlcm5ldCBXaWRnaXRzIFB0eSBMdGQxEjAQBgNVBAMMCWxvY2FsaG9zdDCC ASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBANexqhW+b7Mx2lj5csv7Uq7T St6RWEocEUtuwBUsQ3VGOUTjN0dRxGeeZdDvZYrVsKhMwT1EeoXYlleQJPSEgW1d 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h2-4.2.0/examples/plain_sockets/plain_sockets_client.py0000644000076500000240000000371514117421173022620 0ustar00kriechistaff#!/usr/bin/env python3 """ plain_sockets_client.py ~~~~~~~~~~~~~~~~~~~~~~~ Just enough code to send a GET request via h2 to an HTTP/2 server and receive a response body. This is *not* a complete production-ready HTTP/2 client! """ import socket import ssl import certifi import h2.connection import h2.events SERVER_NAME = 'http2.golang.org' SERVER_PORT = 443 # generic socket and ssl configuration socket.setdefaulttimeout(15) ctx = ssl.create_default_context(cafile=certifi.where()) ctx.set_alpn_protocols(['h2']) # open a socket to the server and initiate TLS/SSL s = socket.create_connection((SERVER_NAME, SERVER_PORT)) s = ctx.wrap_socket(s, server_hostname=SERVER_NAME) c = h2.connection.H2Connection() c.initiate_connection() s.sendall(c.data_to_send()) headers = [ (':method', 'GET'), (':path', '/reqinfo'), (':authority', SERVER_NAME), (':scheme', 'https'), ] c.send_headers(1, headers, end_stream=True) s.sendall(c.data_to_send()) body = b'' response_stream_ended = False while not response_stream_ended: # read raw data from the socket data = s.recv(65536 * 1024) if not data: break # feed raw data into h2, and process resulting events events = c.receive_data(data) for event in events: print(event) if isinstance(event, h2.events.DataReceived): # update flow control so the server doesn't starve us c.acknowledge_received_data(event.flow_controlled_length, event.stream_id) # more response body data received body += event.data if isinstance(event, h2.events.StreamEnded): # response body completed, let's exit the loop response_stream_ended = True break # send any pending data to the server s.sendall(c.data_to_send()) print("Response fully received:") print(body.decode()) # tell the server we are closing the h2 connection c.close_connection() s.sendall(c.data_to_send()) # close the socket s.close() ././@PaxHeader0000000000000000000000000000003400000000000010212 xustar0028 mtime=1738482098.7643301 h2-4.2.0/examples/tornado/0000755000076500000240000000000014747620663014672 5ustar00kriechistaff././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1501439525.0 h2-4.2.0/examples/tornado/server.crt0000644000076500000240000000227413137423045016702 0ustar00kriechistaff-----BEGIN CERTIFICATE----- MIIDUjCCAjoCCQCQmNzzpQTCijANBgkqhkiG9w0BAQUFADBrMQswCQYDVQQGEwJH QjEPMA0GA1UECBMGTG9uZG9uMQ8wDQYDVQQHEwZMb25kb24xETAPBgNVBAoTCGh5 cGVyLWgyMREwDwYDVQQLEwhoeXBleS1oMjEUMBIGA1UEAxMLZXhhbXBsZS5jb20w HhcNMTUwOTE2MjAyOTA0WhcNMTYwOTE1MjAyOTA0WjBrMQswCQYDVQQGEwJHQjEP MA0GA1UECBMGTG9uZG9uMQ8wDQYDVQQHEwZMb25kb24xETAPBgNVBAoTCGh5cGVy LWgyMREwDwYDVQQLEwhoeXBleS1oMjEUMBIGA1UEAxMLZXhhbXBsZS5jb20wggEi MA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQC74ZeB4Jdb5cnC9KXXLJuzjwTg 45q5EeShDYQe0TbKgreiUP6clU3BR0fFAVedN1q/LOuQ1HhvrDk1l4TfGF2bpCIq K+U9CnzcQknvdpyyVeOLtSsCjOPk4xydHwkQxwJvHVdtJx4CzDDqGbHNHCF/9gpQ lsa3JZW+tIZLK0XMEPFQ4XFXgegxTStO7kBBPaVIgG9Ooqc2MG4rjMNUpxa28WF1 SyqWTICf2N8T/C+fPzbQLKCWrFrKUP7WQlOaqPNQL9bCDhSTPRTwQOc2/MzVZ9gT Xr0Z+JMTXwkSMKO52adE1pmKt00jJ1ecZBiJFyjx0X6hH+/59dLbG/7No+PzAgMB AAEwDQYJKoZIhvcNAQEFBQADggEBAG3UhOCa0EemL2iY+C+PR6CwEHQ+n7vkBzNz gKOG+Q39spyzqU1qJAzBxLTE81bIQbDg0R8kcLWHVH2y4zViRxZ0jHUFKMgjONW+ Aj4evic/2Y/LxpLxCajECq/jeMHYrmQONszf9pbc0+exrQpgnwd8asfsM3d/FJS2 5DIWryCKs/61m9vYL8icWx/9cnfPkBoNv1ER+V1L1TH3ARvABh406SBaeqLTm/kG MNuKytKWJsQbNlxzWHVgkKzVsBKvYj0uIEJpClIhbe6XNYRDy8T8mKXVWhJuxH4p /agmCG3nxO8aCrUK/EVmbWmVIfCH3t7jlwMX1nJ8MsRE7Ydnk8I= -----END CERTIFICATE----- ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1501439525.0 h2-4.2.0/examples/tornado/server.key0000644000076500000240000000321713137423045016700 0ustar00kriechistaff-----BEGIN RSA PRIVATE KEY----- MIIEpQIBAAKCAQEAu+GXgeCXW+XJwvSl1yybs48E4OOauRHkoQ2EHtE2yoK3olD+ nJVNwUdHxQFXnTdavyzrkNR4b6w5NZeE3xhdm6QiKivlPQp83EJJ73acslXji7Ur Aozj5OMcnR8JEMcCbx1XbSceAsww6hmxzRwhf/YKUJbGtyWVvrSGSytFzBDxUOFx V4HoMU0rTu5AQT2lSIBvTqKnNjBuK4zDVKcWtvFhdUsqlkyAn9jfE/wvnz820Cyg lqxaylD+1kJTmqjzUC/Wwg4Ukz0U8EDnNvzM1WfYE169GfiTE18JEjCjudmnRNaZ irdNIydXnGQYiRco8dF+oR/v+fXS2xv+zaPj8wIDAQABAoIBAQCsdq278+0c13d4 tViSh4k5r1w8D9IUdp9XU2/nVgckqA9nOVAvbkJc3FC+P7gsQgbUHKj0XoVbhU1S q461t8kduPH/oiGhAcKR8WurHEdE0OC6ewhLJAeCMRQwCrAorXXHh7icIt9ClCuG iSWUcXEy5Cidx3oL3r1xvIbV85fzdDtE9RC1I/kMjAy63S47YGiqh5vYmJkCa8rG Dsd1sEMDPr63XJpqJj3uHRcPvySgXTa+ssTmUH8WJlPTjvDB5hnPz+lkk2JKVPNu 8adzftZ6hSun+tsc4ZJp8XhGu/m/7MjxWh8MeupLHlXcOEsnj4uHQQsOM3zHojr3 aDCZiC1pAoGBAOAhwe1ujoS2VJ5RXJ9KMs7eBER/02MDgWZjo54Jv/jFxPWGslKk QQceuTe+PruRm41nzvk3q4iZXt8pG0bvpgigN2epcVx/O2ouRsUWWBT0JrVlEzha TIvWjtZ5tSQExXgHL3VlM9+ka40l+NldLSPn25+prizaqhalWuvTpP23AoGBANaY VhEI6yhp0BBUSATEv9lRgkwx3EbcnXNXPQjDMOthsyfq7FxbdOBEK1rwSDyuE6Ij zQGcTOfdiur5Ttg0OQilTJIXJAlpoeecOQ9yGma08c5FMXVJJvcZUuWRZWg1ocQj /hx0WVE9NwOoKwTBERv8HX7vJOFRZyvgkJwFxoulAoGAe4m/1XoZrga9z2GzNs10 AdgX7BW00x+MhH4pIiPnn1yK+nYa9jg4647Asnv3IfXZEnEEgRNxReKbi0+iDFBt aNW+lDGuHTi37AfD1EBDnpEQgO1MUcRb6rwBkTAWatsCaO00+HUmyX9cFLm4Vz7n caILyQ6CxZBlLgRIgDHxADMCgYEAtubsJGTHmZBmSCStpXLUWbOBLNQqfTM398DZ QoirP1PsUQ+IGUfSG/u+QCogR6fPEBkXeFHxsoY/Cvsm2lvYaKgK1VFn46Xm2vNq JuIH4pZCqp6LAv4weddZslT0a5eaowRSZ4o7PmTAaRuCXvD3VjTSJwhJFMo+90TV vEWn7gkCgYEAkk+unX9kYmKoUdLh22/tzQekBa8WqMxXDwzBCECTAs2GlpL/f73i zD15TnaNfLP6Q5RNb0N9tb0Gz1wSkwI1+jGAQLnh2K9X9cIVIqJn8Mf/KQa/wUDV Tb1j7FoGUEgX7vbsyWuTd8P76kNYyGqCss1XmbttcSolqpbIdlSUcO0= -----END RSA PRIVATE KEY----- ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1501439549.0 h2-4.2.0/examples/tornado/tornado-server.py0000755000076500000240000000527513137423075020220 0ustar00kriechistaff#!/usr/bin/env python # -*- coding: utf-8 -*- """ tornado-server.py ~~~~~~~~~~~~~~~~~ A fully-functional HTTP/2 server written for Tornado. """ import collections import json import ssl import tornado.gen import tornado.ioloop import tornado.iostream import tornado.tcpserver from h2.config import H2Configuration from h2.connection import H2Connection from h2.events import RequestReceived, DataReceived def create_ssl_context(certfile, keyfile): ssl_context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH) ssl_context.options |= ( ssl.OP_NO_TLSv1 | ssl.OP_NO_TLSv1_1 | ssl.OP_NO_COMPRESSION ) ssl_context.set_ciphers("ECDHE+AESGCM") ssl_context.load_cert_chain(certfile=certfile, keyfile=keyfile) ssl_context.set_alpn_protocols(["h2"]) return ssl_context class H2Server(tornado.tcpserver.TCPServer): @tornado.gen.coroutine def handle_stream(self, stream, address): handler = EchoHeadersHandler(stream) yield handler.handle() class EchoHeadersHandler(object): def __init__(self, stream): self.stream = stream config = H2Configuration(client_side=False) self.conn = H2Connection(config=config) @tornado.gen.coroutine def handle(self): self.conn.initiate_connection() yield self.stream.write(self.conn.data_to_send()) while True: try: data = yield self.stream.read_bytes(65535, partial=True) if not data: break events = self.conn.receive_data(data) for event in events: if isinstance(event, RequestReceived): self.request_received(event.headers, event.stream_id) elif isinstance(event, DataReceived): self.conn.reset_stream(event.stream_id) yield self.stream.write(self.conn.data_to_send()) except tornado.iostream.StreamClosedError: break def request_received(self, headers, stream_id): headers = collections.OrderedDict(headers) data = json.dumps({'headers': headers}, indent=4).encode('utf-8') response_headers = ( (':status', '200'), ('content-type', 'application/json'), ('content-length', str(len(data))), ('server', 'tornado-h2'), ) self.conn.send_headers(stream_id, response_headers) self.conn.send_data(stream_id, data, end_stream=True) if __name__ == '__main__': ssl_context = create_ssl_context('server.crt', 'server.key') server = H2Server(ssl_options=ssl_context) server.listen(8888) io_loop = tornado.ioloop.IOLoop.current() io_loop.start() ././@PaxHeader0000000000000000000000000000003400000000000010212 xustar0028 mtime=1738482098.7651286 h2-4.2.0/examples/twisted/0000755000076500000240000000000014747620663014707 5ustar00kriechistaff././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1618664999.0 h2-4.2.0/examples/twisted/head_request.py0000644000076500000240000000640614036557047017734 0ustar00kriechistaff# -*- coding: utf-8 -*- """ head_request.py ~~~~~~~~~~~~~~~ A short example that demonstrates a client that makes HEAD requests to certain websites. This example is intended as a reproduction of nghttp2 issue 396, for the purposes of compatibility testing. """ from __future__ import print_function from twisted.internet import reactor from twisted.internet.endpoints import connectProtocol, SSL4ClientEndpoint from twisted.internet.protocol import Protocol from twisted.internet.ssl import optionsForClientTLS from hyperframe.frame import SettingsFrame from h2.connection import H2Connection from h2.events import ( ResponseReceived, DataReceived, StreamEnded, StreamReset, SettingsAcknowledged, ) AUTHORITY = u'nghttp2.org' PATH = '/httpbin/' SIZE = 4096 class H2Protocol(Protocol): def __init__(self): self.conn = H2Connection() self.known_proto = None self.request_made = False def connectionMade(self): self.conn.initiate_connection() # This reproduces the error in #396, by changing the header table size. self.conn.update_settings({SettingsFrame.HEADER_TABLE_SIZE: SIZE}) self.transport.write(self.conn.data_to_send()) def dataReceived(self, data): if not self.known_proto: self.known_proto = self.transport.negotiatedProtocol assert self.known_proto == b'h2' events = self.conn.receive_data(data) for event in events: if isinstance(event, ResponseReceived): self.handleResponse(event.headers, event.stream_id) elif isinstance(event, DataReceived): self.handleData(event.data, event.stream_id) elif isinstance(event, StreamEnded): self.endStream(event.stream_id) elif isinstance(event, SettingsAcknowledged): self.settingsAcked(event) elif isinstance(event, StreamReset): reactor.stop() raise RuntimeError("Stream reset: %d" % event.error_code) else: print(event) data = self.conn.data_to_send() if data: self.transport.write(data) def settingsAcked(self, event): # Having received the remote settings change, lets send our request. if not self.request_made: self.sendRequest() def handleResponse(self, response_headers, stream_id): for name, value in response_headers: print("%s: %s" % (name.decode('utf-8'), value.decode('utf-8'))) print("") def handleData(self, data, stream_id): print(data, end='') def endStream(self, stream_id): self.conn.close_connection() self.transport.write(self.conn.data_to_send()) self.transport.loseConnection() reactor.stop() def sendRequest(self): request_headers = [ (':method', 'HEAD'), (':authority', AUTHORITY), (':scheme', 'https'), (':path', PATH), ] self.conn.send_headers(1, request_headers, end_stream=True) self.request_made = True options = optionsForClientTLS( hostname=AUTHORITY, acceptableProtocols=[b'h2'], ) connectProtocol( SSL4ClientEndpoint(reactor, AUTHORITY, 443, options), H2Protocol() ) reactor.run() ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1618664999.0 h2-4.2.0/examples/twisted/post_request.py0000644000076500000240000002057114036557047020017 0ustar00kriechistaff# -*- coding: utf-8 -*- """ post_request.py ~~~~~~~~~~~~~~~ A short example that demonstrates a client that makes POST requests to certain websites. This example is intended to demonstrate how to handle uploading request bodies. In this instance, a file will be uploaded. In order to handle arbitrary files, this example also demonstrates how to obey HTTP/2 flow control rules. Takes one command-line argument: a path to a file in the filesystem to upload. If none is present, uploads this file. """ from __future__ import print_function import mimetypes import os import sys from twisted.internet import reactor, defer from twisted.internet.endpoints import connectProtocol, SSL4ClientEndpoint from twisted.internet.protocol import Protocol from twisted.internet.ssl import optionsForClientTLS from h2.connection import H2Connection from h2.events import ( ResponseReceived, DataReceived, StreamEnded, StreamReset, WindowUpdated, SettingsAcknowledged, ) AUTHORITY = u'nghttp2.org' PATH = '/httpbin/post' class H2Protocol(Protocol): def __init__(self, file_path): self.conn = H2Connection() self.known_proto = None self.request_made = False self.request_complete = False self.file_path = file_path self.flow_control_deferred = None self.fileobj = None self.file_size = None def connectionMade(self): """ Called by Twisted when the TCP connection is established. We can start sending some data now: we should open with the connection preamble. """ self.conn.initiate_connection() self.transport.write(self.conn.data_to_send()) def dataReceived(self, data): """ Called by Twisted when data is received on the connection. We need to check a few things here. Firstly, we want to validate that we actually negotiated HTTP/2: if we didn't, we shouldn't proceed! Then, we want to pass the data to the protocol stack and check what events occurred. """ if not self.known_proto: self.known_proto = self.transport.negotiatedProtocol assert self.known_proto == b'h2' events = self.conn.receive_data(data) for event in events: if isinstance(event, ResponseReceived): self.handleResponse(event.headers) elif isinstance(event, DataReceived): self.handleData(event.data) elif isinstance(event, StreamEnded): self.endStream() elif isinstance(event, SettingsAcknowledged): self.settingsAcked(event) elif isinstance(event, StreamReset): reactor.stop() raise RuntimeError("Stream reset: %d" % event.error_code) elif isinstance(event, WindowUpdated): self.windowUpdated(event) data = self.conn.data_to_send() if data: self.transport.write(data) def settingsAcked(self, event): """ Called when the remote party ACKs our settings. We send a SETTINGS frame as part of the preamble, so if we want to be very polite we can wait until the ACK for that frame comes before we start sending our request. """ if not self.request_made: self.sendRequest() def handleResponse(self, response_headers): """ Handle the response by printing the response headers. """ for name, value in response_headers: print("%s: %s" % (name.decode('utf-8'), value.decode('utf-8'))) print("") def handleData(self, data): """ We handle data that's received by just printing it. """ print(data, end='') def endStream(self): """ We call this when the stream is cleanly ended by the remote peer. That means that the response is complete. Because this code only makes a single HTTP/2 request, once we receive the complete response we can safely tear the connection down and stop the reactor. We do that as cleanly as possible. """ self.request_complete = True self.conn.close_connection() self.transport.write(self.conn.data_to_send()) self.transport.loseConnection() def windowUpdated(self, event): """ We call this when the flow control window for the connection or the stream has been widened. If there's a flow control deferred present (that is, if we're blocked behind the flow control), we fire it. Otherwise, we do nothing. """ if self.flow_control_deferred is None: return # Make sure we remove the flow control deferred to avoid firing it # more than once. flow_control_deferred = self.flow_control_deferred self.flow_control_deferred = None flow_control_deferred.callback(None) def connectionLost(self, reason=None): """ Called by Twisted when the connection is gone. Regardless of whether it was clean or not, we want to stop the reactor. """ if self.fileobj is not None: self.fileobj.close() if reactor.running: reactor.stop() def sendRequest(self): """ Send the POST request. A POST request is made up of one headers frame, and then 0+ data frames. This method begins by sending the headers, and then starts a series of calls to send data. """ # First, we need to work out how large the file is. self.file_size = os.stat(self.file_path).st_size # Next, we want to guess a content-type and content-encoding. content_type, content_encoding = mimetypes.guess_type(self.file_path) # Now we can build a header block. request_headers = [ (':method', 'POST'), (':authority', AUTHORITY), (':scheme', 'https'), (':path', PATH), ('content-length', str(self.file_size)), ] if content_type is not None: request_headers.append(('content-type', content_type)) if content_encoding is not None: request_headers.append(('content-encoding', content_encoding)) self.conn.send_headers(1, request_headers) self.request_made = True # We can now open the file. self.fileobj = open(self.file_path, 'rb') # We now need to send all the relevant data. We do this by checking # what the acceptable amount of data is to send, and sending it. If we # find ourselves blocked behind flow control, we then place a deferred # and wait until that deferred fires. self.sendFileData() def sendFileData(self): """ Send some file data on the connection. """ # Firstly, check what the flow control window is for stream 1. window_size = self.conn.local_flow_control_window(stream_id=1) # Next, check what the maximum frame size is. max_frame_size = self.conn.max_outbound_frame_size # We will send no more than the window size or the remaining file size # of data in this call, whichever is smaller. bytes_to_send = min(window_size, self.file_size) # We now need to send a number of data frames. while bytes_to_send > 0: chunk_size = min(bytes_to_send, max_frame_size) data_chunk = self.fileobj.read(chunk_size) self.conn.send_data(stream_id=1, data=data_chunk) bytes_to_send -= chunk_size self.file_size -= chunk_size # We've prepared a whole chunk of data to send. If the file is fully # sent, we also want to end the stream: we're done here. if self.file_size == 0: self.conn.end_stream(stream_id=1) else: # We've still got data left to send but the window is closed. Save # a Deferred that will call us when the window gets opened. self.flow_control_deferred = defer.Deferred() self.flow_control_deferred.addCallback(self.sendFileData) self.transport.write(self.conn.data_to_send()) try: filename = sys.argv[1] except IndexError: filename = __file__ options = optionsForClientTLS( hostname=AUTHORITY, acceptableProtocols=[b'h2'], ) connectProtocol( SSL4ClientEndpoint(reactor, AUTHORITY, 443, options), H2Protocol(filename) ) reactor.run() ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1501439525.0 h2-4.2.0/examples/twisted/server.crt0000644000076500000240000000227413137423045016717 0ustar00kriechistaff-----BEGIN CERTIFICATE----- MIIDUjCCAjoCCQCQmNzzpQTCijANBgkqhkiG9w0BAQUFADBrMQswCQYDVQQGEwJH QjEPMA0GA1UECBMGTG9uZG9uMQ8wDQYDVQQHEwZMb25kb24xETAPBgNVBAoTCGh5 cGVyLWgyMREwDwYDVQQLEwhoeXBleS1oMjEUMBIGA1UEAxMLZXhhbXBsZS5jb20w HhcNMTUwOTE2MjAyOTA0WhcNMTYwOTE1MjAyOTA0WjBrMQswCQYDVQQGEwJHQjEP 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""" import functools import mimetypes import os import os.path import sys from OpenSSL import crypto from twisted.internet.defer import Deferred, inlineCallbacks from twisted.internet.protocol import Protocol, Factory from twisted.internet import endpoints, reactor, ssl from h2.config import H2Configuration from h2.connection import H2Connection from h2.events import ( RequestReceived, DataReceived, WindowUpdated ) from h2.exceptions import ProtocolError def close_file(file, d): file.close() READ_CHUNK_SIZE = 8192 class H2Protocol(Protocol): def __init__(self, root): config = H2Configuration(client_side=False) self.conn = H2Connection(config=config) self.known_proto = None self.root = root self._flow_control_deferreds = {} def connectionMade(self): self.conn.initiate_connection() self.transport.write(self.conn.data_to_send()) def dataReceived(self, data): if not self.known_proto: self.known_proto = True try: events = self.conn.receive_data(data) except ProtocolError: if self.conn.data_to_send: self.transport.write(self.conn.data_to_send()) self.transport.loseConnection() else: for event in events: if isinstance(event, RequestReceived): self.requestReceived(event.headers, event.stream_id) elif isinstance(event, DataReceived): self.dataFrameReceived(event.stream_id) elif isinstance(event, WindowUpdated): self.windowUpdated(event) if self.conn.data_to_send: self.transport.write(self.conn.data_to_send()) def requestReceived(self, headers, stream_id): headers = dict(headers) # Invalid conversion, fix later. assert headers[b':method'] == b'GET' path = headers[b':path'].lstrip(b'/') full_path = os.path.join(self.root, path) if not os.path.exists(full_path): response_headers = ( (':status', '404'), ('content-length', '0'), ('server', 'twisted-h2'), ) self.conn.send_headers( stream_id, response_headers, end_stream=True ) self.transport.write(self.conn.data_to_send()) else: self.sendFile(full_path, stream_id) return def dataFrameReceived(self, stream_id): self.conn.reset_stream(stream_id) self.transport.write(self.conn.data_to_send()) def sendFile(self, file_path, stream_id): filesize = os.stat(file_path).st_size content_type, content_encoding = mimetypes.guess_type( file_path.decode('utf-8') ) response_headers = [ (':status', '200'), ('content-length', str(filesize)), ('server', 'twisted-h2'), ] if content_type: response_headers.append(('content-type', content_type)) if content_encoding: response_headers.append(('content-encoding', content_encoding)) self.conn.send_headers(stream_id, response_headers) self.transport.write(self.conn.data_to_send()) f = open(file_path, 'rb') d = self._send_file(f, stream_id) d.addErrback(functools.partial(close_file, f)) def windowUpdated(self, event): """ Handle a WindowUpdated event by firing any waiting data sending callbacks. """ stream_id = event.stream_id if stream_id and stream_id in self._flow_control_deferreds: d = self._flow_control_deferreds.pop(stream_id) d.callback(event.delta) elif not stream_id: for d in self._flow_control_deferreds.values(): d.callback(event.delta) self._flow_control_deferreds = {} return @inlineCallbacks def _send_file(self, file, stream_id): """ This callback sends more data for a given file on the stream. """ keep_reading = True while keep_reading: while not self.conn.remote_flow_control_window(stream_id): yield self.wait_for_flow_control(stream_id) chunk_size = min( self.conn.remote_flow_control_window(stream_id), READ_CHUNK_SIZE ) data = file.read(chunk_size) keep_reading = len(data) == chunk_size self.conn.send_data(stream_id, data, not keep_reading) self.transport.write(self.conn.data_to_send()) if not keep_reading: break file.close() def wait_for_flow_control(self, stream_id): """ Returns a Deferred that fires when the flow control window is opened. """ d = Deferred() self._flow_control_deferreds[stream_id] = d return d class H2Factory(Factory): def __init__(self, root): self.root = root def buildProtocol(self, addr): print(H2Protocol) return H2Protocol(self.root) root = sys.argv[1].encode('utf-8') with open('server.crt', 'r') as f: cert_data = f.read() with open('server.key', 'r') as f: key_data = f.read() cert = crypto.load_certificate(crypto.FILETYPE_PEM, cert_data) key = crypto.load_privatekey(crypto.FILETYPE_PEM, key_data) options = ssl.CertificateOptions( privateKey=key, certificate=cert, acceptableProtocols=[b'h2'], ) endpoint = endpoints.SSL4ServerEndpoint(reactor, 8080, options, backlog=128) endpoint.listen(H2Factory(root)) reactor.run() ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1738407185.0 h2-4.2.0/pyproject.toml0000644000076500000240000001355214747376421014330 0ustar00kriechistaff# https://packaging.python.org/en/latest/guides/writing-pyproject-toml/ # https://packaging.python.org/en/latest/specifications/pyproject-toml/ [build-system] requires = ["setuptools"] build-backend = "setuptools.build_meta" [project] name = "h2" description = "Pure-Python HTTP/2 protocol implementation" readme = { file = "README.rst", content-type = "text/x-rst" } license = { file = "LICENSE" } authors = [ { name = "Cory Benfield", email = "cory@lukasa.co.uk" } ] maintainers = [ { name = "Thomas Kriechbaumer", email = "thomas@kriechbaumer.name" }, ] requires-python = ">=3.9" dependencies = [ "hyperframe>=6.1,<7", "hpack>=4.1,<5", ] dynamic = ["version"] # For a list of valid classifiers, see https://pypi.org/classifiers/ classifiers = [ "Development Status :: 5 - Production/Stable", "Intended Audience :: Developers", "License :: OSI Approved :: MIT License", "Programming Language :: Python", "Programming Language :: Python :: 3 :: Only", "Programming Language :: Python :: 3", "Programming Language :: Python :: 3.9", "Programming Language :: Python :: 3.10", "Programming Language :: Python :: 3.11", "Programming Language :: Python :: 3.12", "Programming Language :: Python :: 3.13", "Programming Language :: Python :: Implementation :: CPython", "Programming Language :: Python :: Implementation :: PyPy", ] [project.urls] "Homepage" = "https://github.com/python-hyper/h2/" "Bug Reports" = "https://github.com/python-hyper/h2/issues" "Source" = "https://github.com/python-hyper/h2/" "Documentation" = "https://python-hyper.org/" [dependency-groups] dev = [ { include-group = "testing" }, { include-group = "linting" }, { include-group = "packaging" }, { include-group = "docs" }, ] testing = [ "pytest>=8.3.3,<9", "pytest-cov>=6.0.0,<7", "pytest-xdist>=3.6.1,<4", "hypothesis>=6.119.4,<7", ] linting = [ "ruff>=0.8.0,<1", "mypy>=1.13.0,<2", "typing_extensions>=4.12.2", ] packaging = [ "check-manifest==0.50", "readme-renderer==44.0", "build>=1.2.2,<2", "twine>=5.1.1,<6", "wheel>=0.45.0,<1", ] docs = [ "sphinx>=7.4.7,<9", ] [tool.setuptools.packages.find] where = [ "src" ] [tool.setuptools.package-data] h2 = [ "py.typed" ] [tool.setuptools.dynamic] version = { attr = "h2.__version__" } [tool.ruff] line-length = 150 target-version = "py39" format.preview = true format.docstring-code-line-length = 100 format.docstring-code-format = true lint.select = [ "ALL", ] lint.ignore = [ "PYI034", # PEP 673 not yet available in Python 3.9 - only in 3.11+ "ANN001", # args with typing.Any "ANN002", # args with typing.Any "ANN003", # kwargs with typing.Any "ANN401", # kwargs with typing.Any "SLF001", # implementation detail "CPY", # not required "D101", # docs readability "D102", # docs readability "D105", # docs readability "D107", # docs readability "D200", # docs readability "D205", # docs readability "D205", # docs readability "D203", # docs readability "D212", # docs readability "D400", # docs readability "D401", # docs readability "D415", # docs readability "PLR2004", # readability "SIM108", # readability "RUF012", # readability "FBT001", # readability "FBT002", # readability "PGH003", # readability "PGH004", # readability "FIX001", # readability "FIX002", # readability "TD001", # readability "TD002", # readability "TD003", # readability "S101", # readability "PD901", # readability "ERA001", # readability "ARG001", # readability "ARG002", # readability "PLR0913", # readability ] lint.isort.required-imports = [ "from __future__ import annotations" ] [tool.mypy] show_error_codes = true strict = true [tool.pytest.ini_options] testpaths = [ "tests" ] [tool.coverage.run] branch = true source = [ "h2" ] [tool.coverage.report] fail_under = 100 show_missing = true exclude_lines = [ "pragma: no cover", "raise NotImplementedError()", 'assert False, "Should not be reachable"', # .*:.* # Python \d.* # .*:.* # Platform-specific: ] [tool.coverage.paths] source = [ "src/", ".tox/**/site-packages/", ] [tool.tox] min_version = "4.23.2" env_list = [ "py39", "py310", "py311", "py312", "py313", "pypy3", "lint", "docs", "packaging" ] [tool.tox.gh-actions] python = """ 3.9: py39, h2spec, lint, docs, packaging 3.10: py310 3.11: py311 3.12: py312 3.13: py313 pypy3: pypy3 """ [tool.tox.env_run_base] pass_env = [ "GITHUB_*", ] dependency_groups = ["testing"] commands = [ ["python", "-bb", "-m", "pytest", "--cov-report=xml", "--cov-report=term", "--cov=h2", { replace = "posargs", extend = true }] ] [tool.tox.env.pypy3] # temporarily disable coverage testing on PyPy due to performance problems commands = [ ["pytest", { replace = "posargs", extend = true }] ] [tool.tox.env.lint] dependency_groups = ["linting"] commands = [ ["ruff", "check", "src/"], ["mypy", "src/"], ] [tool.tox.env.docs] dependency_groups = ["docs"] allowlist_externals = ["make"] changedir = "{toxinidir}/docs" commands = [ ["make", "clean"], ["make", "html"], ] [tool.tox.env.packaging] base_python = ["python39"] dependency_groups = ["packaging"] allowlist_externals = ["rm"] commands = [ ["rm", "-rf", "dist/"], ["check-manifest"], ["python", "-m", "build", "--outdir", "dist/"], ["twine", "check", "dist/*"], ] [tool.tox.env.publish] base_python = ["python39"] dependency_groups = ["packaging"] commands = [ ["python", "-m", "build", "--outdir", "dist/"], ["twine", "check", "dist/*"], ["twine", "upload", "dist/*"], ] [tool.tox.env.graphs] basepython = ["python3.9"] deps = [ "graphviz==0.14.1", ] commands = [ ["python", "visualizer/visualize.py", "-i", "docs/source/_static"], ] [tool.tox.env.h2spec] basepython = ["python3.9"] deps = [ "twisted[tls]==20.3.0", ] allowlist_externals = [ "{toxinidir}/tests/h2spectest.sh" ] commands = [ ["{toxinidir}/tests/h2spectest.sh"], ] ././@PaxHeader0000000000000000000000000000003400000000000010212 xustar0028 mtime=1738482098.7752614 h2-4.2.0/setup.cfg0000644000076500000240000000004614747620663013227 0ustar00kriechistaff[egg_info] tag_build = tag_date = 0 ././@PaxHeader0000000000000000000000000000003400000000000010212 xustar0028 mtime=1738482098.7411098 h2-4.2.0/src/0000755000076500000240000000000014747620663012175 5ustar00kriechistaff././@PaxHeader0000000000000000000000000000003400000000000010212 xustar0028 mtime=1738482098.7676241 h2-4.2.0/src/h2/0000755000076500000240000000000014747620663012506 5ustar00kriechistaff././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1738482064.0 h2-4.2.0/src/h2/__init__.py0000644000076500000240000000015514747620620014611 0ustar00kriechistaff""" HTTP/2 protocol implementation for Python. """ from __future__ import annotations __version__ = "4.2.0" ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/src/h2/config.py0000644000076500000240000002023014744265074014320 0ustar00kriechistaff""" h2/config ~~~~~~~~~ Objects for controlling the configuration of the HTTP/2 stack. """ from __future__ import annotations import sys from typing import Any class _BooleanConfigOption: """ Descriptor for handling a boolean config option. This will block attempts to set boolean config options to non-bools. """ def __init__(self, name: str) -> None: self.name = name self.attr_name = f"_{self.name}" def __get__(self, instance: Any, owner: Any) -> bool: return getattr(instance, self.attr_name) # type: ignore def __set__(self, instance: Any, value: bool) -> None: if not isinstance(value, bool): msg = f"{self.name} must be a bool" raise ValueError(msg) # noqa: TRY004 setattr(instance, self.attr_name, value) class DummyLogger: """ A Logger object that does not actual logging, hence a DummyLogger. For the class the log operation is merely a no-op. The intent is to avoid conditionals being sprinkled throughout the h2 code for calls to logging functions when no logger is passed into the corresponding object. """ def __init__(self, *vargs) -> None: # type: ignore pass def debug(self, *vargs, **kwargs) -> None: # type: ignore """ No-op logging. Only level needed for now. """ def trace(self, *vargs, **kwargs) -> None: # type: ignore """ No-op logging. Only level needed for now. """ class OutputLogger: """ A Logger object that prints to stderr or any other file-like object. This class is provided for convenience and not part of the stable API. :param file: A file-like object passed to the print function. Defaults to ``sys.stderr``. :param trace: Enables trace-level output. Defaults to ``False``. """ def __init__(self, file=None, trace_level=False) -> None: # type: ignore super().__init__() self.file = file or sys.stderr self.trace_level = trace_level def debug(self, fmtstr, *args) -> None: # type: ignore print(f"h2 (debug): {fmtstr % args}", file=self.file) def trace(self, fmtstr, *args) -> None: # type: ignore if self.trace_level: print(f"h2 (trace): {fmtstr % args}", file=self.file) class H2Configuration: """ An object that controls the way a single HTTP/2 connection behaves. This object allows the users to customize behaviour. In particular, it allows users to enable or disable optional features, or to otherwise handle various unusual behaviours. This object has very little behaviour of its own: it mostly just ensures that configuration is self-consistent. :param client_side: Whether this object is to be used on the client side of a connection, or on the server side. Affects the logic used by the state machine, the default settings values, the allowable stream IDs, and several other properties. Defaults to ``True``. :type client_side: ``bool`` :param header_encoding: Controls whether the headers emitted by this object in events are transparently decoded to ``unicode`` strings, and what encoding is used to do that decoding. This defaults to ``None``, meaning that headers will be returned as bytes. To automatically decode headers (that is, to return them as unicode strings), this can be set to the string name of any encoding, e.g. ``'utf-8'``. .. versionchanged:: 3.0.0 Changed default value from ``'utf-8'`` to ``None`` :type header_encoding: ``str``, ``False``, or ``None`` :param validate_outbound_headers: Controls whether the headers emitted by this object are validated against the rules in RFC 7540. Disabling this setting will cause outbound header validation to be skipped, and allow the object to emit headers that may be illegal according to RFC 7540. Defaults to ``True``. :type validate_outbound_headers: ``bool`` :param normalize_outbound_headers: Controls whether the headers emitted by this object are normalized before sending. Disabling this setting will cause outbound header normalization to be skipped, and allow the object to emit headers that may be illegal according to RFC 7540. Defaults to ``True``. :type normalize_outbound_headers: ``bool`` :param split_outbound_cookies: Controls whether the outbound cookie headers are split before sending or not. According to RFC 7540 - 8.1.2.5 the outbound header cookie headers may be split to improve headers compression. Default is ``False``. :type split_outbound_cookies: ``bool`` :param validate_inbound_headers: Controls whether the headers received by this object are validated against the rules in RFC 7540. Disabling this setting will cause inbound header validation to be skipped, and allow the object to receive headers that may be illegal according to RFC 7540. Defaults to ``True``. :type validate_inbound_headers: ``bool`` :param normalize_inbound_headers: Controls whether the headers received by this object are normalized according to the rules of RFC 7540. Disabling this setting may lead to h2 emitting header blocks that some RFCs forbid, e.g. with multiple cookie fields. .. versionadded:: 3.0.0 :type normalize_inbound_headers: ``bool`` :param logger: A logger that conforms to the requirements for this module, those being no I/O and no context switches, which is needed in order to run in asynchronous operation. .. versionadded:: 2.6.0 :type logger: ``logging.Logger`` """ client_side = _BooleanConfigOption("client_side") validate_outbound_headers = _BooleanConfigOption( "validate_outbound_headers", ) normalize_outbound_headers = _BooleanConfigOption( "normalize_outbound_headers", ) split_outbound_cookies = _BooleanConfigOption( "split_outbound_cookies", ) validate_inbound_headers = _BooleanConfigOption( "validate_inbound_headers", ) normalize_inbound_headers = _BooleanConfigOption( "normalize_inbound_headers", ) def __init__(self, client_side: bool = True, header_encoding: bool | str | None = None, validate_outbound_headers: bool = True, normalize_outbound_headers: bool = True, split_outbound_cookies: bool = False, validate_inbound_headers: bool = True, normalize_inbound_headers: bool = True, logger: DummyLogger | OutputLogger | None = None) -> None: self.client_side = client_side self.header_encoding = header_encoding self.validate_outbound_headers = validate_outbound_headers self.normalize_outbound_headers = normalize_outbound_headers self.split_outbound_cookies = split_outbound_cookies self.validate_inbound_headers = validate_inbound_headers self.normalize_inbound_headers = normalize_inbound_headers self.logger = logger or DummyLogger(__name__) @property def header_encoding(self) -> bool | str | None: """ Controls whether the headers emitted by this object in events are transparently decoded to ``unicode`` strings, and what encoding is used to do that decoding. This defaults to ``None``, meaning that headers will be returned as bytes. To automatically decode headers (that is, to return them as unicode strings), this can be set to the string name of any encoding, e.g. ``'utf-8'``. """ return self._header_encoding @header_encoding.setter def header_encoding(self, value: bool | str | None) -> None: """ Enforces constraints on the value of header encoding. """ if not isinstance(value, (bool, str, type(None))): msg = "header_encoding must be bool, string, or None" raise ValueError(msg) # noqa: TRY004 if value is True: msg = "header_encoding cannot be True" raise ValueError(msg) self._header_encoding = value ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/src/h2/connection.py0000644000076500000240000025144014744265074015223 0ustar00kriechistaff""" h2/connection ~~~~~~~~~~~~~ An implementation of a HTTP/2 connection. """ from __future__ import annotations import base64 from enum import Enum, IntEnum from typing import TYPE_CHECKING, Any, Callable from hpack.exceptions import HPACKError, OversizedHeaderListError from hpack.hpack import Decoder, Encoder from hyperframe.exceptions import InvalidPaddingError from hyperframe.frame import ( AltSvcFrame, ContinuationFrame, DataFrame, ExtensionFrame, Frame, GoAwayFrame, HeadersFrame, PingFrame, PriorityFrame, PushPromiseFrame, RstStreamFrame, SettingsFrame, WindowUpdateFrame, ) from .config import H2Configuration from .errors import ErrorCodes, _error_code_from_int from .events import ( AlternativeServiceAvailable, ConnectionTerminated, Event, InformationalResponseReceived, PingAckReceived, PingReceived, PriorityUpdated, RemoteSettingsChanged, RequestReceived, ResponseReceived, SettingsAcknowledged, TrailersReceived, UnknownFrameReceived, WindowUpdated, ) from .exceptions import ( DenialOfServiceError, FlowControlError, FrameTooLargeError, NoAvailableStreamIDError, NoSuchStreamError, ProtocolError, RFC1122Error, StreamClosedError, StreamIDTooLowError, TooManyStreamsError, ) from .frame_buffer import FrameBuffer from .settings import ChangedSetting, SettingCodes, Settings from .stream import H2Stream, StreamClosedBy from .utilities import SizeLimitDict, guard_increment_window from .windows import WindowManager if TYPE_CHECKING: # pragma: no cover from collections.abc import Iterable from hpack.struct import Header, HeaderWeaklyTyped class ConnectionState(Enum): IDLE = 0 CLIENT_OPEN = 1 SERVER_OPEN = 2 CLOSED = 3 class ConnectionInputs(Enum): SEND_HEADERS = 0 SEND_PUSH_PROMISE = 1 SEND_DATA = 2 SEND_GOAWAY = 3 SEND_WINDOW_UPDATE = 4 SEND_PING = 5 SEND_SETTINGS = 6 SEND_RST_STREAM = 7 SEND_PRIORITY = 8 RECV_HEADERS = 9 RECV_PUSH_PROMISE = 10 RECV_DATA = 11 RECV_GOAWAY = 12 RECV_WINDOW_UPDATE = 13 RECV_PING = 14 RECV_SETTINGS = 15 RECV_RST_STREAM = 16 RECV_PRIORITY = 17 SEND_ALTERNATIVE_SERVICE = 18 # Added in 2.3.0 RECV_ALTERNATIVE_SERVICE = 19 # Added in 2.3.0 class AllowedStreamIDs(IntEnum): EVEN = 0 ODD = 1 class H2ConnectionStateMachine: """ A single HTTP/2 connection state machine. This state machine, while defined in its own class, is logically part of the H2Connection class also defined in this file. The state machine itself maintains very little state directly, instead focusing entirely on managing state transitions. """ # For the purposes of this state machine we treat HEADERS and their # associated CONTINUATION frames as a single jumbo frame. The protocol # allows/requires this by preventing other frames from being interleved in # between HEADERS/CONTINUATION frames. # # The _transitions dictionary contains a mapping of tuples of # (state, input) to tuples of (side_effect_function, end_state). This map # contains all allowed transitions: anything not in this map is invalid # and immediately causes a transition to ``closed``. _transitions = { # State: idle (ConnectionState.IDLE, ConnectionInputs.SEND_HEADERS): (None, ConnectionState.CLIENT_OPEN), (ConnectionState.IDLE, ConnectionInputs.RECV_HEADERS): (None, ConnectionState.SERVER_OPEN), (ConnectionState.IDLE, ConnectionInputs.SEND_SETTINGS): (None, ConnectionState.IDLE), (ConnectionState.IDLE, ConnectionInputs.RECV_SETTINGS): (None, ConnectionState.IDLE), (ConnectionState.IDLE, ConnectionInputs.SEND_WINDOW_UPDATE): (None, ConnectionState.IDLE), (ConnectionState.IDLE, ConnectionInputs.RECV_WINDOW_UPDATE): (None, ConnectionState.IDLE), (ConnectionState.IDLE, ConnectionInputs.SEND_PING): (None, ConnectionState.IDLE), (ConnectionState.IDLE, ConnectionInputs.RECV_PING): (None, ConnectionState.IDLE), (ConnectionState.IDLE, ConnectionInputs.SEND_GOAWAY): (None, ConnectionState.CLOSED), (ConnectionState.IDLE, ConnectionInputs.RECV_GOAWAY): (None, ConnectionState.CLOSED), (ConnectionState.IDLE, ConnectionInputs.SEND_PRIORITY): (None, ConnectionState.IDLE), (ConnectionState.IDLE, ConnectionInputs.RECV_PRIORITY): (None, ConnectionState.IDLE), (ConnectionState.IDLE, ConnectionInputs.SEND_ALTERNATIVE_SERVICE): (None, ConnectionState.SERVER_OPEN), (ConnectionState.IDLE, ConnectionInputs.RECV_ALTERNATIVE_SERVICE): (None, ConnectionState.CLIENT_OPEN), # State: open, client side. (ConnectionState.CLIENT_OPEN, ConnectionInputs.SEND_HEADERS): (None, ConnectionState.CLIENT_OPEN), (ConnectionState.CLIENT_OPEN, ConnectionInputs.SEND_DATA): (None, ConnectionState.CLIENT_OPEN), (ConnectionState.CLIENT_OPEN, ConnectionInputs.SEND_GOAWAY): (None, ConnectionState.CLOSED), (ConnectionState.CLIENT_OPEN, ConnectionInputs.SEND_WINDOW_UPDATE): (None, ConnectionState.CLIENT_OPEN), (ConnectionState.CLIENT_OPEN, ConnectionInputs.SEND_PING): (None, ConnectionState.CLIENT_OPEN), (ConnectionState.CLIENT_OPEN, ConnectionInputs.SEND_SETTINGS): (None, ConnectionState.CLIENT_OPEN), (ConnectionState.CLIENT_OPEN, ConnectionInputs.SEND_PRIORITY): (None, ConnectionState.CLIENT_OPEN), (ConnectionState.CLIENT_OPEN, ConnectionInputs.RECV_HEADERS): (None, ConnectionState.CLIENT_OPEN), (ConnectionState.CLIENT_OPEN, ConnectionInputs.RECV_PUSH_PROMISE): (None, ConnectionState.CLIENT_OPEN), (ConnectionState.CLIENT_OPEN, ConnectionInputs.RECV_DATA): (None, ConnectionState.CLIENT_OPEN), (ConnectionState.CLIENT_OPEN, ConnectionInputs.RECV_GOAWAY): (None, ConnectionState.CLOSED), (ConnectionState.CLIENT_OPEN, ConnectionInputs.RECV_WINDOW_UPDATE): (None, ConnectionState.CLIENT_OPEN), (ConnectionState.CLIENT_OPEN, ConnectionInputs.RECV_PING): (None, ConnectionState.CLIENT_OPEN), (ConnectionState.CLIENT_OPEN, ConnectionInputs.RECV_SETTINGS): (None, ConnectionState.CLIENT_OPEN), (ConnectionState.CLIENT_OPEN, ConnectionInputs.SEND_RST_STREAM): (None, ConnectionState.CLIENT_OPEN), (ConnectionState.CLIENT_OPEN, ConnectionInputs.RECV_RST_STREAM): (None, ConnectionState.CLIENT_OPEN), (ConnectionState.CLIENT_OPEN, ConnectionInputs.RECV_PRIORITY): (None, ConnectionState.CLIENT_OPEN), (ConnectionState.CLIENT_OPEN, ConnectionInputs.RECV_ALTERNATIVE_SERVICE): (None, ConnectionState.CLIENT_OPEN), # State: open, server side. (ConnectionState.SERVER_OPEN, ConnectionInputs.SEND_HEADERS): (None, ConnectionState.SERVER_OPEN), (ConnectionState.SERVER_OPEN, ConnectionInputs.SEND_PUSH_PROMISE): (None, ConnectionState.SERVER_OPEN), (ConnectionState.SERVER_OPEN, ConnectionInputs.SEND_DATA): (None, ConnectionState.SERVER_OPEN), (ConnectionState.SERVER_OPEN, ConnectionInputs.SEND_GOAWAY): (None, ConnectionState.CLOSED), (ConnectionState.SERVER_OPEN, ConnectionInputs.SEND_WINDOW_UPDATE): (None, ConnectionState.SERVER_OPEN), (ConnectionState.SERVER_OPEN, ConnectionInputs.SEND_PING): (None, ConnectionState.SERVER_OPEN), (ConnectionState.SERVER_OPEN, ConnectionInputs.SEND_SETTINGS): (None, ConnectionState.SERVER_OPEN), (ConnectionState.SERVER_OPEN, ConnectionInputs.SEND_PRIORITY): (None, ConnectionState.SERVER_OPEN), (ConnectionState.SERVER_OPEN, ConnectionInputs.RECV_HEADERS): (None, ConnectionState.SERVER_OPEN), (ConnectionState.SERVER_OPEN, ConnectionInputs.RECV_DATA): (None, ConnectionState.SERVER_OPEN), (ConnectionState.SERVER_OPEN, ConnectionInputs.RECV_GOAWAY): (None, ConnectionState.CLOSED), (ConnectionState.SERVER_OPEN, ConnectionInputs.RECV_WINDOW_UPDATE): (None, ConnectionState.SERVER_OPEN), (ConnectionState.SERVER_OPEN, ConnectionInputs.RECV_PING): (None, ConnectionState.SERVER_OPEN), (ConnectionState.SERVER_OPEN, ConnectionInputs.RECV_SETTINGS): (None, ConnectionState.SERVER_OPEN), (ConnectionState.SERVER_OPEN, ConnectionInputs.RECV_PRIORITY): (None, ConnectionState.SERVER_OPEN), (ConnectionState.SERVER_OPEN, ConnectionInputs.SEND_RST_STREAM): (None, ConnectionState.SERVER_OPEN), (ConnectionState.SERVER_OPEN, ConnectionInputs.RECV_RST_STREAM): (None, ConnectionState.SERVER_OPEN), (ConnectionState.SERVER_OPEN, ConnectionInputs.SEND_ALTERNATIVE_SERVICE): (None, ConnectionState.SERVER_OPEN), (ConnectionState.SERVER_OPEN, ConnectionInputs.RECV_ALTERNATIVE_SERVICE): (None, ConnectionState.SERVER_OPEN), # State: closed (ConnectionState.CLOSED, ConnectionInputs.SEND_GOAWAY): (None, ConnectionState.CLOSED), (ConnectionState.CLOSED, ConnectionInputs.RECV_GOAWAY): (None, ConnectionState.CLOSED), } def __init__(self) -> None: self.state = ConnectionState.IDLE def process_input(self, input_: ConnectionInputs) -> list[Event]: """ Process a specific input in the state machine. """ if not isinstance(input_, ConnectionInputs): msg = "Input must be an instance of ConnectionInputs" raise ValueError(msg) # noqa: TRY004 try: func, target_state = self._transitions[(self.state, input_)] except KeyError as e: old_state = self.state self.state = ConnectionState.CLOSED msg = f"Invalid input {input_} in state {old_state}" raise ProtocolError(msg) from e else: self.state = target_state if func is not None: # pragma: no cover return func() return [] class H2Connection: """ A low-level HTTP/2 connection object. This handles building and receiving frames and maintains both connection and per-stream state for all streams on this connection. This wraps a HTTP/2 Connection state machine implementation, ensuring that frames can only be sent/received when the connection is in a valid state. It also builds stream state machines on demand to ensure that the constraints of those state machines are met as well. Attempts to create frames that cannot be sent will raise a ``ProtocolError``. .. versionchanged:: 2.3.0 Added the ``header_encoding`` keyword argument. .. versionchanged:: 2.5.0 Added the ``config`` keyword argument. Deprecated the ``client_side`` and ``header_encoding`` parameters. .. versionchanged:: 3.0.0 Removed deprecated parameters and properties. :param config: The configuration for the HTTP/2 connection. .. versionadded:: 2.5.0 :type config: :class:`H2Configuration ` """ # The initial maximum outbound frame size. This can be changed by receiving # a settings frame. DEFAULT_MAX_OUTBOUND_FRAME_SIZE = 65535 # The initial maximum inbound frame size. This is somewhat arbitrarily # chosen. DEFAULT_MAX_INBOUND_FRAME_SIZE = 2**24 # The highest acceptable stream ID. HIGHEST_ALLOWED_STREAM_ID = 2**31 - 1 # The largest acceptable window increment. MAX_WINDOW_INCREMENT = 2**31 - 1 # The initial default value of SETTINGS_MAX_HEADER_LIST_SIZE. DEFAULT_MAX_HEADER_LIST_SIZE = 2**16 # Keep in memory limited amount of results for streams closes MAX_CLOSED_STREAMS = 2**16 def __init__(self, config: H2Configuration | None = None) -> None: self.state_machine = H2ConnectionStateMachine() self.streams: dict[int, H2Stream] = {} self.highest_inbound_stream_id = 0 self.highest_outbound_stream_id = 0 self.encoder = Encoder() self.decoder = Decoder() # This won't always actually do anything: for versions of HPACK older # than 2.3.0 it does nothing. However, we have to try! self.decoder.max_header_list_size = self.DEFAULT_MAX_HEADER_LIST_SIZE #: The configuration for this HTTP/2 connection object. #: #: .. versionadded:: 2.5.0 self.config = config or H2Configuration(client_side=True) # Objects that store settings, including defaults. # # We set the MAX_CONCURRENT_STREAMS value to 100 because its default is # unbounded, and that's a dangerous default because it allows # essentially unbounded resources to be allocated regardless of how # they will be used. 100 should be suitable for the average # application. This default obviously does not apply to the remote # peer's settings: the remote peer controls them! # # We also set MAX_HEADER_LIST_SIZE to a reasonable value. This is to # advertise our defence against CVE-2016-6581. However, not all # versions of HPACK will let us do it. That's ok: we should at least # suggest that we're not vulnerable. self.local_settings = Settings( client=self.config.client_side, initial_values={ SettingCodes.MAX_CONCURRENT_STREAMS: 100, SettingCodes.MAX_HEADER_LIST_SIZE: self.DEFAULT_MAX_HEADER_LIST_SIZE, }, ) self.remote_settings = Settings(client=not self.config.client_side) # The current value of the connection flow control windows on the # connection. self.outbound_flow_control_window = ( self.remote_settings.initial_window_size ) #: The maximum size of a frame that can be emitted by this peer, in #: bytes. self.max_outbound_frame_size = self.remote_settings.max_frame_size #: The maximum size of a frame that can be received by this peer, in #: bytes. self.max_inbound_frame_size = self.local_settings.max_frame_size # Buffer for incoming data. self.incoming_buffer = FrameBuffer(server=not self.config.client_side) # A private variable to store a sequence of received header frames # until completion. self._header_frames: list[Frame] = [] # Data that needs to be sent. self._data_to_send = bytearray() # Keeps track of how streams are closed. # Used to ensure that we don't blow up in the face of frames that were # in flight when a RST_STREAM was sent. # Also used to determine whether we should consider a frame received # while a stream is closed as either a stream error or a connection # error. self._closed_streams: dict[int, StreamClosedBy | None] = SizeLimitDict( size_limit=self.MAX_CLOSED_STREAMS, ) # The flow control window manager for the connection. self._inbound_flow_control_window_manager = WindowManager( max_window_size=self.local_settings.initial_window_size, ) # When in doubt use dict-dispatch. self._frame_dispatch_table: dict[type[Frame], Callable] = { # type: ignore HeadersFrame: self._receive_headers_frame, PushPromiseFrame: self._receive_push_promise_frame, SettingsFrame: self._receive_settings_frame, DataFrame: self._receive_data_frame, WindowUpdateFrame: self._receive_window_update_frame, PingFrame: self._receive_ping_frame, RstStreamFrame: self._receive_rst_stream_frame, PriorityFrame: self._receive_priority_frame, GoAwayFrame: self._receive_goaway_frame, ContinuationFrame: self._receive_naked_continuation, AltSvcFrame: self._receive_alt_svc_frame, ExtensionFrame: self._receive_unknown_frame, } def _prepare_for_sending(self, frames: list[Frame]) -> None: if not frames: return self._data_to_send += b"".join(f.serialize() for f in frames) assert all(f.body_len <= self.max_outbound_frame_size for f in frames) def _open_streams(self, remainder: int) -> int: """ A common method of counting number of open streams. Returns the number of streams that are open *and* that have (stream ID % 2) == remainder. While it iterates, also deletes any closed streams. """ count = 0 to_delete = [] for stream_id, stream in self.streams.items(): if stream.open and (stream_id % 2 == remainder): count += 1 elif stream.closed: to_delete.append(stream_id) for stream_id in to_delete: stream = self.streams.pop(stream_id) self._closed_streams[stream_id] = stream.closed_by return count @property def open_outbound_streams(self) -> int: """ The current number of open outbound streams. """ outbound_numbers = int(self.config.client_side) return self._open_streams(outbound_numbers) @property def open_inbound_streams(self) -> int: """ The current number of open inbound streams. """ inbound_numbers = int(not self.config.client_side) return self._open_streams(inbound_numbers) @property def inbound_flow_control_window(self) -> int: """ The size of the inbound flow control window for the connection. This is rarely publicly useful: instead, use :meth:`remote_flow_control_window `. This shortcut is largely present to provide a shortcut to this data. """ return self._inbound_flow_control_window_manager.current_window_size def _begin_new_stream(self, stream_id: int, allowed_ids: AllowedStreamIDs) -> H2Stream: """ Initiate a new stream. .. versionchanged:: 2.0.0 Removed this function from the public API. :param stream_id: The ID of the stream to open. :param allowed_ids: What kind of stream ID is allowed. """ self.config.logger.debug( "Attempting to initiate stream ID %d", stream_id, ) outbound = self._stream_id_is_outbound(stream_id) highest_stream_id = ( self.highest_outbound_stream_id if outbound else self.highest_inbound_stream_id ) if stream_id <= highest_stream_id: raise StreamIDTooLowError(stream_id, highest_stream_id) if (stream_id % 2) != int(allowed_ids): msg = "Invalid stream ID for peer." raise ProtocolError(msg) s = H2Stream( stream_id, config=self.config, inbound_window_size=self.local_settings.initial_window_size, outbound_window_size=self.remote_settings.initial_window_size, ) self.config.logger.debug("Stream ID %d created", stream_id) s.max_outbound_frame_size = self.max_outbound_frame_size self.streams[stream_id] = s self.config.logger.debug("Current streams: %s", self.streams.keys()) if outbound: self.highest_outbound_stream_id = stream_id else: self.highest_inbound_stream_id = stream_id return s def initiate_connection(self) -> None: """ Provides any data that needs to be sent at the start of the connection. Must be called for both clients and servers. """ self.config.logger.debug("Initializing connection") self.state_machine.process_input(ConnectionInputs.SEND_SETTINGS) if self.config.client_side: preamble = b"PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n" else: preamble = b"" f = SettingsFrame(0) for setting, value in self.local_settings.items(): f.settings[setting] = value self.config.logger.debug( "Send Settings frame: %s", self.local_settings, ) self._data_to_send += preamble + f.serialize() def initiate_upgrade_connection(self, settings_header: bytes | None = None) -> bytes | None: """ Call to initialise the connection object for use with an upgraded HTTP/2 connection (i.e. a connection negotiated using the ``Upgrade: h2c`` HTTP header). This method differs from :meth:`initiate_connection ` in several ways. Firstly, it handles the additional SETTINGS frame that is sent in the ``HTTP2-Settings`` header field. When called on a client connection, this method will return a bytestring that the caller can put in the ``HTTP2-Settings`` field they send on their initial request. When called on a server connection, the user **must** provide the value they received from the client in the ``HTTP2-Settings`` header field to the ``settings_header`` argument, which will be used appropriately. Additionally, this method sets up stream 1 in a half-closed state appropriate for this side of the connection, to reflect the fact that the request is already complete. Finally, this method also prepares the appropriate preamble to be sent after the upgrade. .. versionadded:: 2.3.0 :param settings_header: (optional, server-only): The value of the ``HTTP2-Settings`` header field received from the client. :type settings_header: ``bytes`` :returns: For clients, a bytestring to put in the ``HTTP2-Settings``. For servers, returns nothing. :rtype: ``bytes`` or ``None`` """ self.config.logger.debug( "Upgrade connection. Current settings: %s", self.local_settings, ) frame_data = None # Begin by getting the preamble in place. self.initiate_connection() if self.config.client_side: f = SettingsFrame(0) for setting, value in self.local_settings.items(): f.settings[setting] = value frame_data = f.serialize_body() frame_data = base64.urlsafe_b64encode(frame_data) elif settings_header: # We have a settings header from the client. This needs to be # applied, but we want to throw away the ACK. We do this by # inserting the data into a Settings frame and then passing it to # the state machine, but ignoring the return value. settings_header = base64.urlsafe_b64decode(settings_header) f = SettingsFrame(0) f.parse_body(memoryview(settings_header)) self._receive_settings_frame(f) # Set up appropriate state. Stream 1 in a half-closed state: # half-closed(local) for clients, half-closed(remote) for servers. # Additionally, we need to set up the Connection state machine. connection_input = ( ConnectionInputs.SEND_HEADERS if self.config.client_side else ConnectionInputs.RECV_HEADERS ) self.config.logger.debug("Process input %s", connection_input) self.state_machine.process_input(connection_input) # Set up stream 1. self._begin_new_stream(stream_id=1, allowed_ids=AllowedStreamIDs.ODD) self.streams[1].upgrade(self.config.client_side) return frame_data def _get_or_create_stream(self, stream_id: int, allowed_ids: AllowedStreamIDs) -> H2Stream: """ Gets a stream by its stream ID. Will create one if one does not already exist. Use allowed_ids to circumvent the usual stream ID rules for clients and servers. .. versionchanged:: 2.0.0 Removed this function from the public API. """ try: return self.streams[stream_id] except KeyError: return self._begin_new_stream(stream_id, allowed_ids) def _get_stream_by_id(self, stream_id: int | None) -> H2Stream: """ Gets a stream by its stream ID. Raises NoSuchStreamError if the stream ID does not correspond to a known stream and is higher than the current maximum: raises if it is lower than the current maximum. .. versionchanged:: 2.0.0 Removed this function from the public API. """ if not stream_id: raise NoSuchStreamError(-1) # pragma: no cover try: return self.streams[stream_id] except KeyError as e: outbound = self._stream_id_is_outbound(stream_id) highest_stream_id = ( self.highest_outbound_stream_id if outbound else self.highest_inbound_stream_id ) if stream_id > highest_stream_id: raise NoSuchStreamError(stream_id) from e raise StreamClosedError(stream_id) from e def get_next_available_stream_id(self) -> int: """ Returns an integer suitable for use as the stream ID for the next stream created by this endpoint. For server endpoints, this stream ID will be even. For client endpoints, this stream ID will be odd. If no stream IDs are available, raises :class:`NoAvailableStreamIDError `. .. warning:: The return value from this function does not change until the stream ID has actually been used by sending or pushing headers on that stream. For that reason, it should be called as close as possible to the actual use of the stream ID. .. versionadded:: 2.0.0 :raises: :class:`NoAvailableStreamIDError ` :returns: The next free stream ID this peer can use to initiate a stream. :rtype: ``int`` """ # No streams have been opened yet, so return the lowest allowed stream # ID. if not self.highest_outbound_stream_id: next_stream_id = 1 if self.config.client_side else 2 else: next_stream_id = self.highest_outbound_stream_id + 2 self.config.logger.debug( "Next available stream ID %d", next_stream_id, ) if next_stream_id > self.HIGHEST_ALLOWED_STREAM_ID: msg = "Exhausted allowed stream IDs" raise NoAvailableStreamIDError(msg) return next_stream_id def send_headers(self, stream_id: int, headers: Iterable[HeaderWeaklyTyped], end_stream: bool = False, priority_weight: int | None = None, priority_depends_on: int | None = None, priority_exclusive: bool | None = None) -> None: """ Send headers on a given stream. This function can be used to send request or response headers: the kind that are sent depends on whether this connection has been opened as a client or server connection, and whether the stream was opened by the remote peer or not. If this is a client connection, calling ``send_headers`` will send the headers as a request. It will also implicitly open the stream being used. If this is a client connection and ``send_headers`` has *already* been called, this will send trailers instead. If this is a server connection, calling ``send_headers`` will send the headers as a response. It is a protocol error for a server to open a stream by sending headers. If this is a server connection and ``send_headers`` has *already* been called, this will send trailers instead. When acting as a server, you may call ``send_headers`` any number of times allowed by the following rules, in this order: - zero or more times with ``(':status', '1XX')`` (where ``1XX`` is a placeholder for any 100-level status code). - once with any other status header. - zero or one time for trailers. That is, you are allowed to send as many informational responses as you like, followed by one complete response and zero or one HTTP trailer blocks. Clients may send one or two header blocks: one request block, and optionally one trailer block. If it is important to send HPACK "never indexed" header fields (as defined in `RFC 7451 Section 7.1.3 `_), the user may instead provide headers using the HPACK library's :class:`HeaderTuple ` and :class:`NeverIndexedHeaderTuple ` objects. This method also allows users to prioritize the stream immediately, by sending priority information on the HEADERS frame directly. To do this, any one of ``priority_weight``, ``priority_depends_on``, or ``priority_exclusive`` must be set to a value that is not ``None``. For more information on the priority fields, see :meth:`prioritize `. .. warning:: In HTTP/2, it is mandatory that all the HTTP/2 special headers (that is, ones whose header keys begin with ``:``) appear at the start of the header block, before any normal headers. .. versionchanged:: 2.3.0 Added support for using :class:`HeaderTuple ` objects to store headers. .. versionchanged:: 2.4.0 Added the ability to provide priority keyword arguments: ``priority_weight``, ``priority_depends_on``, and ``priority_exclusive``. :param stream_id: The stream ID to send the headers on. If this stream does not currently exist, it will be created. :type stream_id: ``int`` :param headers: The request/response headers to send. :type headers: An iterable of two tuples of bytestrings or :class:`HeaderTuple ` objects. :param end_stream: Whether this headers frame should end the stream immediately (that is, whether no more data will be sent after this frame). Defaults to ``False``. :type end_stream: ``bool`` :param priority_weight: Sets the priority weight of the stream. See :meth:`prioritize ` for more about how this field works. Defaults to ``None``, which means that no priority information will be sent. :type priority_weight: ``int`` or ``None`` :param priority_depends_on: Sets which stream this one depends on for priority purposes. See :meth:`prioritize ` for more about how this field works. Defaults to ``None``, which means that no priority information will be sent. :type priority_depends_on: ``int`` or ``None`` :param priority_exclusive: Sets whether this stream exclusively depends on the stream given in ``priority_depends_on`` for priority purposes. See :meth:`prioritize ` for more about how this field workds. Defaults to ``None``, which means that no priority information will be sent. :type priority_depends_on: ``bool`` or ``None`` :returns: Nothing """ self.config.logger.debug( "Send headers on stream ID %d", stream_id, ) # Check we can open the stream. if stream_id not in self.streams: max_open_streams = self.remote_settings.max_concurrent_streams if (self.open_outbound_streams + 1) > max_open_streams: msg = f"Max outbound streams is {max_open_streams}, {self.open_outbound_streams} open" raise TooManyStreamsError(msg) self.state_machine.process_input(ConnectionInputs.SEND_HEADERS) stream = self._get_or_create_stream( stream_id, AllowedStreamIDs(self.config.client_side), ) frames: list[Frame] = [] frames.extend(stream.send_headers( headers, self.encoder, end_stream, )) # We may need to send priority information. priority_present = ( (priority_weight is not None) or (priority_depends_on is not None) or (priority_exclusive is not None) ) if priority_present: if not self.config.client_side: msg = "Servers SHOULD NOT prioritize streams." raise RFC1122Error(msg) headers_frame = frames[0] assert isinstance(headers_frame, HeadersFrame) headers_frame.flags.add("PRIORITY") frames[0] = _add_frame_priority( headers_frame, priority_weight, priority_depends_on, priority_exclusive, ) self._prepare_for_sending(frames) def send_data(self, stream_id: int, data: bytes | memoryview, end_stream: bool = False, pad_length: Any = None) -> None: """ Send data on a given stream. This method does no breaking up of data: if the data is larger than the value returned by :meth:`local_flow_control_window ` for this stream then a :class:`FlowControlError ` will be raised. If the data is larger than :data:`max_outbound_frame_size ` then a :class:`FrameTooLargeError ` will be raised. h2 does this to avoid buffering the data internally. If the user has more data to send than h2 will allow, consider breaking it up and buffering it externally. :param stream_id: The ID of the stream on which to send the data. :type stream_id: ``int`` :param data: The data to send on the stream. :type data: ``bytes`` :param end_stream: (optional) Whether this is the last data to be sent on the stream. Defaults to ``False``. :type end_stream: ``bool`` :param pad_length: (optional) Length of the padding to apply to the data frame. Defaults to ``None`` for no use of padding. Note that a value of ``0`` results in padding of length ``0`` (with the "padding" flag set on the frame). .. versionadded:: 2.6.0 :type pad_length: ``int`` :returns: Nothing """ self.config.logger.debug( "Send data on stream ID %d with len %d", stream_id, len(data), ) frame_size = len(data) if pad_length is not None: if not isinstance(pad_length, int): msg = "pad_length must be an int" raise TypeError(msg) if pad_length < 0 or pad_length > 255: msg = "pad_length must be within range: [0, 255]" raise ValueError(msg) # Account for padding bytes plus the 1-byte padding length field. frame_size += pad_length + 1 self.config.logger.debug( "Frame size on stream ID %d is %d", stream_id, frame_size, ) if frame_size > self.local_flow_control_window(stream_id): msg = f"Cannot send {frame_size} bytes, flow control window is {self.local_flow_control_window(stream_id)}" raise FlowControlError(msg) if frame_size > self.max_outbound_frame_size: msg = f"Cannot send frame size {frame_size}, max frame size is {self.max_outbound_frame_size}" raise FrameTooLargeError(msg) self.state_machine.process_input(ConnectionInputs.SEND_DATA) frames = self.streams[stream_id].send_data( data, end_stream, pad_length=pad_length, ) self._prepare_for_sending(frames) self.outbound_flow_control_window -= frame_size self.config.logger.debug( "Outbound flow control window size is %d", self.outbound_flow_control_window, ) assert self.outbound_flow_control_window >= 0 def end_stream(self, stream_id: int) -> None: """ Cleanly end a given stream. This method ends a stream by sending an empty DATA frame on that stream with the ``END_STREAM`` flag set. :param stream_id: The ID of the stream to end. :type stream_id: ``int`` :returns: Nothing """ self.config.logger.debug("End stream ID %d", stream_id) self.state_machine.process_input(ConnectionInputs.SEND_DATA) frames = self.streams[stream_id].end_stream() self._prepare_for_sending(frames) def increment_flow_control_window(self, increment: int, stream_id: int | None = None) -> None: """ Increment a flow control window, optionally for a single stream. Allows the remote peer to send more data. .. versionchanged:: 2.0.0 Rejects attempts to increment the flow control window by out of range values with a ``ValueError``. :param increment: The amount to increment the flow control window by. :type increment: ``int`` :param stream_id: (optional) The ID of the stream that should have its flow control window opened. If not present or ``None``, the connection flow control window will be opened instead. :type stream_id: ``int`` or ``None`` :returns: Nothing :raises: ``ValueError`` """ if not (1 <= increment <= self.MAX_WINDOW_INCREMENT): msg = f"Flow control increment must be between 1 and {self.MAX_WINDOW_INCREMENT}" raise ValueError(msg) self.state_machine.process_input(ConnectionInputs.SEND_WINDOW_UPDATE) if stream_id is not None: stream = self.streams[stream_id] frames = stream.increase_flow_control_window( increment, ) self.config.logger.debug( "Increase stream ID %d flow control window by %d", stream_id, increment, ) else: self._inbound_flow_control_window_manager.window_opened(increment) f = WindowUpdateFrame(0) f.window_increment = increment frames = [f] self.config.logger.debug( "Increase connection flow control window by %d", increment, ) self._prepare_for_sending(frames) def push_stream(self, stream_id: int, promised_stream_id: int, request_headers: Iterable[HeaderWeaklyTyped]) -> None: """ Push a response to the client by sending a PUSH_PROMISE frame. If it is important to send HPACK "never indexed" header fields (as defined in `RFC 7451 Section 7.1.3 `_), the user may instead provide headers using the HPACK library's :class:`HeaderTuple ` and :class:`NeverIndexedHeaderTuple ` objects. :param stream_id: The ID of the stream that this push is a response to. :type stream_id: ``int`` :param promised_stream_id: The ID of the stream that the pushed response will be sent on. :type promised_stream_id: ``int`` :param request_headers: The headers of the request that the pushed response will be responding to. :type request_headers: An iterable of two tuples of bytestrings or :class:`HeaderTuple ` objects. :returns: Nothing """ self.config.logger.debug( "Send Push Promise frame on stream ID %d", stream_id, ) if not self.remote_settings.enable_push: msg = "Remote peer has disabled stream push" raise ProtocolError(msg) self.state_machine.process_input(ConnectionInputs.SEND_PUSH_PROMISE) stream = self._get_stream_by_id(stream_id) # We need to prevent users pushing streams in response to streams that # they themselves have already pushed: see #163 and RFC 7540 § 6.6. The # easiest way to do that is to assert that the stream_id is not even: # this shortcut works because only servers can push and the state # machine will enforce this. if (stream_id % 2) == 0: msg = "Cannot recursively push streams." raise ProtocolError(msg) new_stream = self._begin_new_stream( promised_stream_id, AllowedStreamIDs.EVEN, ) self.streams[promised_stream_id] = new_stream frames = stream.push_stream_in_band( promised_stream_id, request_headers, self.encoder, ) new_frames = new_stream.locally_pushed() self._prepare_for_sending(frames + new_frames) def ping(self, opaque_data: bytes | str) -> None: """ Send a PING frame. :param opaque_data: A bytestring of length 8 that will be sent in the PING frame. :returns: Nothing """ self.config.logger.debug("Send Ping frame") if not isinstance(opaque_data, bytes) or len(opaque_data) != 8: msg = f"Invalid value for ping data: {opaque_data!r}" raise ValueError(msg) self.state_machine.process_input(ConnectionInputs.SEND_PING) f = PingFrame(0) f.opaque_data = opaque_data self._prepare_for_sending([f]) def reset_stream(self, stream_id: int, error_code: ErrorCodes | int = 0) -> None: """ Reset a stream. This method forcibly closes a stream by sending a RST_STREAM frame for a given stream. This is not a graceful closure. To gracefully end a stream, try the :meth:`end_stream ` method. :param stream_id: The ID of the stream to reset. :type stream_id: ``int`` :param error_code: (optional) The error code to use to reset the stream. Defaults to :data:`ErrorCodes.NO_ERROR `. :type error_code: ``int`` :returns: Nothing """ self.config.logger.debug("Reset stream ID %d", stream_id) self.state_machine.process_input(ConnectionInputs.SEND_RST_STREAM) stream = self._get_stream_by_id(stream_id) frames = stream.reset_stream(error_code) self._prepare_for_sending(frames) def close_connection(self, error_code: ErrorCodes | int = 0, additional_data: bytes | None = None, last_stream_id: int | None = None) -> None: """ Close a connection, emitting a GOAWAY frame. .. versionchanged:: 2.4.0 Added ``additional_data`` and ``last_stream_id`` arguments. :param error_code: (optional) The error code to send in the GOAWAY frame. :param additional_data: (optional) Additional debug data indicating a reason for closing the connection. Must be a bytestring. :param last_stream_id: (optional) The last stream which was processed by the sender. Defaults to ``highest_inbound_stream_id``. :returns: Nothing """ self.config.logger.debug("Close connection") self.state_machine.process_input(ConnectionInputs.SEND_GOAWAY) # Additional_data must be bytes if additional_data is not None: assert isinstance(additional_data, bytes) if last_stream_id is None: last_stream_id = self.highest_inbound_stream_id f = GoAwayFrame( stream_id=0, last_stream_id=last_stream_id, error_code=error_code, additional_data=(additional_data or b""), ) self._prepare_for_sending([f]) def update_settings(self, new_settings: dict[SettingCodes | int, int]) -> None: """ Update the local settings. This will prepare and emit the appropriate SETTINGS frame. :param new_settings: A dictionary of {setting: new value} """ self.config.logger.debug( "Update connection settings to %s", new_settings, ) self.state_machine.process_input(ConnectionInputs.SEND_SETTINGS) self.local_settings.update(new_settings) s = SettingsFrame(0) s.settings = new_settings self._prepare_for_sending([s]) def advertise_alternative_service(self, field_value: bytes | str, origin: bytes | None = None, stream_id: int | None = None) -> None: """ Notify a client about an available Alternative Service. An Alternative Service is defined in `RFC 7838 `_. An Alternative Service notification informs a client that a given origin is also available elsewhere. Alternative Services can be advertised in two ways. Firstly, they can be advertised explicitly: that is, a server can say "origin X is also available at Y". To advertise like this, set the ``origin`` argument and not the ``stream_id`` argument. Alternatively, they can be advertised implicitly: that is, a server can say "the origin you're contacting on stream X is also available at Y". To advertise like this, set the ``stream_id`` argument and not the ``origin`` argument. The explicit method of advertising can be done as long as the connection is active. The implicit method can only be done after the client has sent the request headers and before the server has sent the response headers: outside of those points, h2 will forbid sending the Alternative Service advertisement by raising a ProtocolError. The ``field_value`` parameter is specified in RFC 7838. h2 does not validate or introspect this argument: the user is required to ensure that it's well-formed. ``field_value`` corresponds to RFC 7838's "Alternative Service Field Value". .. note:: It is strongly preferred to use the explicit method of advertising Alternative Services. The implicit method of advertising Alternative Services has a number of subtleties and can lead to inconsistencies between the server and client. h2 allows both mechanisms, but caution is strongly advised. .. versionadded:: 2.3.0 :param field_value: The RFC 7838 Alternative Service Field Value. This argument is not introspected by h2: the user is responsible for ensuring that it is well-formed. :type field_value: ``bytes`` :param origin: The origin/authority to which the Alternative Service being advertised applies. Must not be provided at the same time as ``stream_id``. :type origin: ``bytes`` or ``None`` :param stream_id: The ID of the stream which was sent to the authority for which this Alternative Service advertisement applies. Must not be provided at the same time as ``origin``. :type stream_id: ``int`` or ``None`` :returns: Nothing. """ if not isinstance(field_value, bytes): msg = "Field must be bytestring." raise ValueError(msg) # noqa: TRY004 if origin is not None and stream_id is not None: msg = "Must not provide both origin and stream_id" raise ValueError(msg) self.state_machine.process_input( ConnectionInputs.SEND_ALTERNATIVE_SERVICE, ) if origin is not None: # This ALTSVC is sent on stream zero. f = AltSvcFrame(stream_id=0) f.origin = origin f.field = field_value frames: list[Frame] = [f] else: stream = self._get_stream_by_id(stream_id) frames = stream.advertise_alternative_service(field_value) self._prepare_for_sending(frames) def prioritize(self, stream_id: int, weight: int | None = None, depends_on: int | None = None, exclusive: bool | None = None) -> None: """ Notify a server about the priority of a stream. Stream priorities are a form of guidance to a remote server: they inform the server about how important a given response is, so that the server may allocate its resources (e.g. bandwidth, CPU time, etc.) accordingly. This exists to allow clients to ensure that the most important data arrives earlier, while less important data does not starve out the more important data. Stream priorities are explained in depth in `RFC 7540 Section 5.3 `_. This method updates the priority information of a single stream. It may be called well before a stream is actively in use, or well after a stream is closed. .. warning:: RFC 7540 allows for servers to change the priority of streams. However, h2 **does not** allow server stacks to do this. This is because most clients do not adequately know how to respond when provided conflicting priority information, and relatively little utility is provided by making that functionality available. .. note:: h2 **does not** maintain any information about the RFC 7540 priority tree. That means that h2 does not prevent incautious users from creating invalid priority trees, particularly by creating priority loops. While some basic error checking is provided by h2, users are strongly recommended to understand their prioritisation strategies before using the priority tools here. .. note:: Priority information is strictly advisory. Servers are allowed to disregard it entirely. Avoid relying on the idea that your priority signaling will definitely be obeyed. .. versionadded:: 2.4.0 :param stream_id: The ID of the stream to prioritize. :type stream_id: ``int`` :param weight: The weight to give the stream. Defaults to ``16``, the default weight of any stream. May be any value between ``1`` and ``256`` inclusive. The relative weight of a stream indicates what proportion of available resources will be allocated to that stream. :type weight: ``int`` :param depends_on: The ID of the stream on which this stream depends. This stream will only be progressed if it is impossible to progress the parent stream (the one on which this one depends). Passing the value ``0`` means that this stream does not depend on any other. Defaults to ``0``. :type depends_on: ``int`` :param exclusive: Whether this stream is an exclusive dependency of its "parent" stream (i.e. the stream given by ``depends_on``). If a stream is an exclusive dependency of another, that means that all previously-set children of the parent are moved to become children of the new exclusively-dependent stream. Defaults to ``False``. :type exclusive: ``bool`` """ if not self.config.client_side: msg = "Servers SHOULD NOT prioritize streams." raise RFC1122Error(msg) self.state_machine.process_input( ConnectionInputs.SEND_PRIORITY, ) frame = PriorityFrame(stream_id) frame_prio = _add_frame_priority(frame, weight, depends_on, exclusive) self._prepare_for_sending([frame_prio]) def local_flow_control_window(self, stream_id: int) -> int: """ Returns the maximum amount of data that can be sent on stream ``stream_id``. This value will never be larger than the total data that can be sent on the connection: even if the given stream allows more data, the connection window provides a logical maximum to the amount of data that can be sent. The maximum data that can be sent in a single data frame on a stream is either this value, or the maximum frame size, whichever is *smaller*. :param stream_id: The ID of the stream whose flow control window is being queried. :type stream_id: ``int`` :returns: The amount of data in bytes that can be sent on the stream before the flow control window is exhausted. :rtype: ``int`` """ stream = self._get_stream_by_id(stream_id) return min( self.outbound_flow_control_window, stream.outbound_flow_control_window, ) def remote_flow_control_window(self, stream_id: int) -> int: """ Returns the maximum amount of data the remote peer can send on stream ``stream_id``. This value will never be larger than the total data that can be sent on the connection: even if the given stream allows more data, the connection window provides a logical maximum to the amount of data that can be sent. The maximum data that can be sent in a single data frame on a stream is either this value, or the maximum frame size, whichever is *smaller*. :param stream_id: The ID of the stream whose flow control window is being queried. :type stream_id: ``int`` :returns: The amount of data in bytes that can be received on the stream before the flow control window is exhausted. :rtype: ``int`` """ stream = self._get_stream_by_id(stream_id) return min( self.inbound_flow_control_window, stream.inbound_flow_control_window, ) def acknowledge_received_data(self, acknowledged_size: int, stream_id: int) -> None: """ Inform the :class:`H2Connection ` that a certain number of flow-controlled bytes have been processed, and that the space should be handed back to the remote peer at an opportune time. .. versionadded:: 2.5.0 :param acknowledged_size: The total *flow-controlled size* of the data that has been processed. Note that this must include the amount of padding that was sent with that data. :type acknowledged_size: ``int`` :param stream_id: The ID of the stream on which this data was received. :type stream_id: ``int`` :returns: Nothing :rtype: ``None`` """ self.config.logger.debug( "Ack received data on stream ID %d with size %d", stream_id, acknowledged_size, ) if stream_id <= 0: msg = f"Stream ID {stream_id} is not valid for acknowledge_received_data" raise ValueError(msg) if acknowledged_size < 0: msg = "Cannot acknowledge negative data" raise ValueError(msg) frames: list[Frame] = [] conn_manager = self._inbound_flow_control_window_manager conn_increment = conn_manager.process_bytes(acknowledged_size) if conn_increment: f = WindowUpdateFrame(0) f.window_increment = conn_increment frames.append(f) try: stream = self._get_stream_by_id(stream_id) except StreamClosedError: # The stream is already gone. We're not worried about incrementing # the window in this case. pass else: # No point incrementing the windows of closed streams. if stream.open: frames.extend( stream.acknowledge_received_data(acknowledged_size), ) self._prepare_for_sending(frames) def data_to_send(self, amount: int | None = None) -> bytes: """ Returns some data for sending out of the internal data buffer. This method is analogous to ``read`` on a file-like object, but it doesn't block. Instead, it returns as much data as the user asks for, or less if that much data is not available. It does not perform any I/O, and so uses a different name. :param amount: (optional) The maximum amount of data to return. If not set, or set to ``None``, will return as much data as possible. :type amount: ``int`` :returns: A bytestring containing the data to send on the wire. :rtype: ``bytes`` """ if amount is None: data = bytes(self._data_to_send) self._data_to_send = bytearray() return data data = bytes(self._data_to_send[:amount]) self._data_to_send = self._data_to_send[amount:] return data def clear_outbound_data_buffer(self) -> None: """ Clears the outbound data buffer, such that if this call was immediately followed by a call to :meth:`data_to_send `, that call would return no data. This method should not normally be used, but is made available to avoid exposing implementation details. """ self._data_to_send = bytearray() def _acknowledge_settings(self) -> list[Frame]: """ Acknowledge settings that have been received. .. versionchanged:: 2.0.0 Removed from public API, removed useless ``event`` parameter, made automatic. :returns: Nothing """ self.state_machine.process_input(ConnectionInputs.SEND_SETTINGS) changes = self.remote_settings.acknowledge() if SettingCodes.INITIAL_WINDOW_SIZE in changes: setting = changes[SettingCodes.INITIAL_WINDOW_SIZE] self._flow_control_change_from_settings( setting.original_value, setting.new_value, ) # HEADER_TABLE_SIZE changes by the remote part affect our encoder: cf. # RFC 7540 Section 6.5.2. if SettingCodes.HEADER_TABLE_SIZE in changes: setting = changes[SettingCodes.HEADER_TABLE_SIZE] self.encoder.header_table_size = setting.new_value if SettingCodes.MAX_FRAME_SIZE in changes: setting = changes[SettingCodes.MAX_FRAME_SIZE] self.max_outbound_frame_size = setting.new_value for stream in self.streams.values(): stream.max_outbound_frame_size = setting.new_value f = SettingsFrame(0) f.flags.add("ACK") return [f] def _flow_control_change_from_settings(self, old_value: int | None, new_value: int) -> None: """ Update flow control windows in response to a change in the value of SETTINGS_INITIAL_WINDOW_SIZE. When this setting is changed, it automatically updates all flow control windows by the delta in the settings values. Note that it does not increment the *connection* flow control window, per section 6.9.2 of RFC 7540. """ delta = new_value - (old_value or 0) for stream in self.streams.values(): stream.outbound_flow_control_window = guard_increment_window( stream.outbound_flow_control_window, delta, ) def _inbound_flow_control_change_from_settings(self, old_value: int | None, new_value: int) -> None: """ Update remote flow control windows in response to a change in the value of SETTINGS_INITIAL_WINDOW_SIZE. When this setting is changed, it automatically updates all remote flow control windows by the delta in the settings values. """ delta = new_value - (old_value or 0) for stream in self.streams.values(): stream._inbound_flow_control_change_from_settings(delta) def receive_data(self, data: bytes) -> list[Event]: """ Pass some received HTTP/2 data to the connection for handling. :param data: The data received from the remote peer on the network. :type data: ``bytes`` :returns: A list of events that the remote peer triggered by sending this data. """ self.config.logger.trace( "Process received data on connection. Received data: %r", data, ) events: list[Event] = [] self.incoming_buffer.add_data(data) self.incoming_buffer.max_frame_size = self.max_inbound_frame_size try: for frame in self.incoming_buffer: events.extend(self._receive_frame(frame)) except InvalidPaddingError as e: self._terminate_connection(ErrorCodes.PROTOCOL_ERROR) msg = "Received frame with invalid padding." raise ProtocolError(msg) from e except ProtocolError as e: # For whatever reason, receiving the frame caused a protocol error. # We should prepare to emit a GoAway frame before throwing the # exception up further. No need for an event: the exception will # do fine. self._terminate_connection(e.error_code) raise return events def _receive_frame(self, frame: Frame) -> list[Event]: """ Handle a frame received on the connection. .. versionchanged:: 2.0.0 Removed from the public API. """ events: list[Event] self.config.logger.trace("Received frame: %s", repr(frame)) try: # I don't love using __class__ here, maybe reconsider it. frames, events = self._frame_dispatch_table[frame.__class__](frame) except StreamClosedError as e: # If the stream was closed by RST_STREAM, we just send a RST_STREAM # to the remote peer. Otherwise, this is a connection error, and so # we will re-raise to trigger one. if self._stream_is_closed_by_reset(e.stream_id): f = RstStreamFrame(e.stream_id) f.error_code = e.error_code self._prepare_for_sending([f]) events = e._events else: raise except StreamIDTooLowError as e: # The stream ID seems invalid. This may happen when the closed # stream has been cleaned up, or when the remote peer has opened a # new stream with a higher stream ID than this one, forcing it # closed implicitly. # # Check how the stream was closed: depending on the mechanism, it # is either a stream error or a connection error. if self._stream_is_closed_by_reset(e.stream_id): # Closed by RST_STREAM is a stream error. f = RstStreamFrame(e.stream_id) f.error_code = ErrorCodes.STREAM_CLOSED self._prepare_for_sending([f]) events = [] elif self._stream_is_closed_by_end(e.stream_id): # Closed by END_STREAM is a connection error. raise StreamClosedError(e.stream_id) from e else: # Closed implicitly, also a connection error, but of type # PROTOCOL_ERROR. raise else: self._prepare_for_sending(frames) return events def _terminate_connection(self, error_code: ErrorCodes) -> None: """ Terminate the connection early. Used in error handling blocks to send GOAWAY frames. """ f = GoAwayFrame(0) f.last_stream_id = self.highest_inbound_stream_id f.error_code = error_code self.state_machine.process_input(ConnectionInputs.SEND_GOAWAY) self._prepare_for_sending([f]) def _receive_headers_frame(self, frame: HeadersFrame) -> tuple[list[Frame], list[Event]]: """ Receive a headers frame on the connection. """ # If necessary, check we can open the stream. Also validate that the # stream ID is valid. if frame.stream_id not in self.streams: max_open_streams = self.local_settings.max_concurrent_streams if (self.open_inbound_streams + 1) > max_open_streams: msg = f"Max outbound streams is {max_open_streams}, {self.open_outbound_streams} open" raise TooManyStreamsError(msg) # Let's decode the headers. We handle headers as bytes internally up # until we hang them off the event, at which point we may optionally # convert them to unicode. headers = _decode_headers(self.decoder, frame.data) events = self.state_machine.process_input( ConnectionInputs.RECV_HEADERS, ) stream = self._get_or_create_stream( frame.stream_id, AllowedStreamIDs(not self.config.client_side), ) frames, stream_events = stream.receive_headers( headers, "END_STREAM" in frame.flags, self.config.header_encoding, ) if "PRIORITY" in frame.flags: p_frames, p_events = self._receive_priority_frame(frame) expected_frame_types = (RequestReceived, ResponseReceived, TrailersReceived, InformationalResponseReceived) assert isinstance(stream_events[0], expected_frame_types) assert isinstance(p_events[0], PriorityUpdated) stream_events[0].priority_updated = p_events[0] stream_events.extend(p_events) assert not p_frames return frames, events + stream_events def _receive_push_promise_frame(self, frame: PushPromiseFrame) -> tuple[list[Frame], list[Event]]: """ Receive a push-promise frame on the connection. """ if not self.local_settings.enable_push: msg = "Received pushed stream" raise ProtocolError(msg) pushed_headers = _decode_headers(self.decoder, frame.data) events = self.state_machine.process_input( ConnectionInputs.RECV_PUSH_PROMISE, ) try: stream = self._get_stream_by_id(frame.stream_id) except NoSuchStreamError as e: # We need to check if the parent stream was reset by us. If it was # then we presume that the PUSH_PROMISE was in flight when we reset # the parent stream. Rather than accept the new stream, just reset # it. # # If this was closed naturally, however, we should call this a # PROTOCOL_ERROR: pushing a stream on a naturally closed stream is # a real problem because it creates a brand new stream that the # remote peer now believes exists. if (self._stream_closed_by(frame.stream_id) == StreamClosedBy.SEND_RST_STREAM): f = RstStreamFrame(frame.promised_stream_id) f.error_code = ErrorCodes.REFUSED_STREAM return [f], events msg = "Attempted to push on closed stream." raise ProtocolError(msg) from e # We need to prevent peers pushing streams in response to streams that # they themselves have already pushed: see #163 and RFC 7540 § 6.6. The # easiest way to do that is to assert that the stream_id is not even: # this shortcut works because only servers can push and the state # machine will enforce this. if (frame.stream_id % 2) == 0: msg = "Cannot recursively push streams." raise ProtocolError(msg) try: frames, stream_events = stream.receive_push_promise_in_band( frame.promised_stream_id, pushed_headers, self.config.header_encoding, ) except StreamClosedError: # The parent stream was reset by us, so we presume that # PUSH_PROMISE was in flight when we reset the parent stream. # So we just reset the new stream. f = RstStreamFrame(frame.promised_stream_id) f.error_code = ErrorCodes.REFUSED_STREAM return [f], events new_stream = self._begin_new_stream( frame.promised_stream_id, AllowedStreamIDs.EVEN, ) self.streams[frame.promised_stream_id] = new_stream new_stream.remotely_pushed(pushed_headers) return frames, events + stream_events def _handle_data_on_closed_stream(self, events: list[Event], exc: StreamClosedError, frame: DataFrame) -> tuple[list[Frame], list[Event]]: # This stream is already closed - and yet we received a DATA frame. # The received DATA frame counts towards the connection flow window. # We need to manually to acknowledge the DATA frame to update the flow # window of the connection. Otherwise the whole connection stalls due # the inbound flow window being 0. frames: list[Frame] = [] conn_manager = self._inbound_flow_control_window_manager conn_increment = conn_manager.process_bytes( frame.flow_controlled_length, ) if conn_increment: window_update_frame = WindowUpdateFrame(0) window_update_frame.window_increment = conn_increment frames.append(window_update_frame) self.config.logger.debug( "Received DATA frame on closed stream %d - " "auto-emitted a WINDOW_UPDATE by %d", frame.stream_id, conn_increment, ) rst_stream_frame = RstStreamFrame(exc.stream_id) rst_stream_frame.error_code = exc.error_code frames.append(rst_stream_frame) self.config.logger.debug( "Stream %s already CLOSED or cleaned up - auto-emitted a RST_FRAME", frame.stream_id, ) return frames, events + exc._events def _receive_data_frame(self, frame: DataFrame) -> tuple[list[Frame], list[Event]]: """ Receive a data frame on the connection. """ flow_controlled_length = frame.flow_controlled_length events = self.state_machine.process_input( ConnectionInputs.RECV_DATA, ) self._inbound_flow_control_window_manager.window_consumed( flow_controlled_length, ) try: stream = self._get_stream_by_id(frame.stream_id) frames, stream_events = stream.receive_data( frame.data, "END_STREAM" in frame.flags, flow_controlled_length, ) except StreamClosedError as e: # This stream is either marked as CLOSED or already gone from our # internal state. return self._handle_data_on_closed_stream(events, e, frame) return frames, events + stream_events def _receive_settings_frame(self, frame: SettingsFrame) -> tuple[list[Frame], list[Event]]: """ Receive a SETTINGS frame on the connection. """ events = self.state_machine.process_input( ConnectionInputs.RECV_SETTINGS, ) # This is an ack of the local settings. if "ACK" in frame.flags: changed_settings = self._local_settings_acked() ack_event = SettingsAcknowledged() ack_event.changed_settings = changed_settings events.append(ack_event) return [], events # Add the new settings. self.remote_settings.update(frame.settings) events.append( RemoteSettingsChanged.from_settings( self.remote_settings, frame.settings, ), ) frames = self._acknowledge_settings() return frames, events def _receive_window_update_frame(self, frame: WindowUpdateFrame) -> tuple[list[Frame], list[Event]]: """ Receive a WINDOW_UPDATE frame on the connection. """ # hyperframe will take care of validating the window_increment. # If we reach in here, we can assume a valid value. events = self.state_machine.process_input( ConnectionInputs.RECV_WINDOW_UPDATE, ) if frame.stream_id: try: stream = self._get_stream_by_id(frame.stream_id) frames, stream_events = stream.receive_window_update( frame.window_increment, ) except StreamClosedError: return [], events else: # Increment our local flow control window. self.outbound_flow_control_window = guard_increment_window( self.outbound_flow_control_window, frame.window_increment, ) # FIXME: Should we split this into one event per active stream? window_updated_event = WindowUpdated() window_updated_event.stream_id = 0 window_updated_event.delta = frame.window_increment stream_events = [window_updated_event] frames = [] return frames, events + stream_events def _receive_ping_frame(self, frame: PingFrame) -> tuple[list[Frame], list[Event]]: """ Receive a PING frame on the connection. """ events = self.state_machine.process_input( ConnectionInputs.RECV_PING, ) frames: list[Frame] = [] evt: PingReceived | PingAckReceived if "ACK" in frame.flags: evt = PingAckReceived() else: evt = PingReceived() # automatically ACK the PING with the same 'opaque data' f = PingFrame(0) f.flags.add("ACK") f.opaque_data = frame.opaque_data frames.append(f) evt.ping_data = frame.opaque_data events.append(evt) return frames, events def _receive_rst_stream_frame(self, frame: RstStreamFrame) -> tuple[list[Frame], list[Event]]: """ Receive a RST_STREAM frame on the connection. """ events = self.state_machine.process_input( ConnectionInputs.RECV_RST_STREAM, ) try: stream = self._get_stream_by_id(frame.stream_id) except NoSuchStreamError: # The stream is missing. That's ok, we just do nothing here. stream_frames: list[Frame] = [] stream_events: list[Event] = [] else: stream_frames, stream_events = stream.stream_reset(frame) return stream_frames, events + stream_events def _receive_priority_frame(self, frame: HeadersFrame | PriorityFrame) -> tuple[list[Frame], list[Event]]: """ Receive a PRIORITY frame on the connection. """ events = self.state_machine.process_input( ConnectionInputs.RECV_PRIORITY, ) event = PriorityUpdated() event.stream_id = frame.stream_id event.depends_on = frame.depends_on event.exclusive = frame.exclusive # Weight is an integer between 1 and 256, but the byte only allows # 0 to 255: add one. event.weight = frame.stream_weight + 1 # A stream may not depend on itself. if event.depends_on == frame.stream_id: msg = f"Stream {frame.stream_id} may not depend on itself" raise ProtocolError(msg) events.append(event) return [], events def _receive_goaway_frame(self, frame: GoAwayFrame) -> tuple[list[Frame], list[Event]]: """ Receive a GOAWAY frame on the connection. """ events = self.state_machine.process_input( ConnectionInputs.RECV_GOAWAY, ) # Clear the outbound data buffer: we cannot send further data now. self.clear_outbound_data_buffer() # Fire an appropriate ConnectionTerminated event. new_event = ConnectionTerminated() new_event.error_code = _error_code_from_int(frame.error_code) new_event.last_stream_id = frame.last_stream_id new_event.additional_data = (frame.additional_data if frame.additional_data else None) events.append(new_event) return [], events def _receive_naked_continuation(self, frame: ContinuationFrame) -> None: """ A naked CONTINUATION frame has been received. This is always an error, but the type of error it is depends on the state of the stream and must transition the state of the stream, so we need to pass it to the appropriate stream. """ stream = self._get_stream_by_id(frame.stream_id) stream.receive_continuation() msg = "Should not be reachable" # pragma: no cover raise AssertionError(msg) # pragma: no cover def _receive_alt_svc_frame(self, frame: AltSvcFrame) -> tuple[list[Frame], list[Event]]: """ An ALTSVC frame has been received. This frame, specified in RFC 7838, is used to advertise alternative places where the same service can be reached. This frame can optionally be received either on a stream or on stream 0, and its semantics are different in each case. """ events = self.state_machine.process_input( ConnectionInputs.RECV_ALTERNATIVE_SERVICE, ) frames = [] if frame.stream_id: # Given that it makes no sense to receive ALTSVC on a stream # before that stream has been opened with a HEADERS frame, the # ALTSVC frame cannot create a stream. If the stream is not # present, we simply ignore the frame. try: stream = self._get_stream_by_id(frame.stream_id) except (NoSuchStreamError, StreamClosedError): pass else: stream_frames, stream_events = stream.receive_alt_svc(frame) frames.extend(stream_frames) events.extend(stream_events) else: # This frame is sent on stream 0. The origin field on the frame # must be present, though if it isn't it's not a ProtocolError # (annoyingly), we just need to ignore it. if not frame.origin: return frames, events # If we're a server, we want to ignore this (RFC 7838 says so). if not self.config.client_side: return frames, events event = AlternativeServiceAvailable() event.origin = frame.origin event.field_value = frame.field events.append(event) return frames, events def _receive_unknown_frame(self, frame: ExtensionFrame) -> tuple[list[Frame], list[Event]]: """ We have received a frame that we do not understand. This is almost certainly an extension frame, though it's impossible to be entirely sure. RFC 7540 § 5.5 says that we MUST ignore unknown frame types: so we do. We do notify the user that we received one, however. """ # All we do here is log. self.config.logger.debug( "Received unknown extension frame (ID %d)", frame.stream_id, ) event = UnknownFrameReceived() event.frame = frame return [], [event] def _local_settings_acked(self) -> dict[SettingCodes | int, ChangedSetting]: """ Handle the local settings being ACKed, update internal state. """ changes = self.local_settings.acknowledge() if SettingCodes.INITIAL_WINDOW_SIZE in changes: setting = changes[SettingCodes.INITIAL_WINDOW_SIZE] self._inbound_flow_control_change_from_settings( setting.original_value, setting.new_value, ) if SettingCodes.MAX_HEADER_LIST_SIZE in changes: setting = changes[SettingCodes.MAX_HEADER_LIST_SIZE] self.decoder.max_header_list_size = setting.new_value if SettingCodes.MAX_FRAME_SIZE in changes: setting = changes[SettingCodes.MAX_FRAME_SIZE] self.max_inbound_frame_size = setting.new_value if SettingCodes.HEADER_TABLE_SIZE in changes: setting = changes[SettingCodes.HEADER_TABLE_SIZE] # This is safe across all hpack versions: some versions just won't # respect it. self.decoder.max_allowed_table_size = setting.new_value return changes def _stream_id_is_outbound(self, stream_id: int) -> bool: """ Returns ``True`` if the stream ID corresponds to an outbound stream (one initiated by this peer), returns ``False`` otherwise. """ return (stream_id % 2 == int(self.config.client_side)) def _stream_closed_by(self, stream_id: int) -> StreamClosedBy | None: """ Returns how the stream was closed. The return value will be either a member of ``h2.stream.StreamClosedBy`` or ``None``. If ``None``, the stream was closed implicitly by the peer opening a stream with a higher stream ID before opening this one. """ if stream_id in self.streams: return self.streams[stream_id].closed_by if stream_id in self._closed_streams: return self._closed_streams[stream_id] return None def _stream_is_closed_by_reset(self, stream_id: int) -> bool: """ Returns ``True`` if the stream was closed by sending or receiving a RST_STREAM frame. Returns ``False`` otherwise. """ return self._stream_closed_by(stream_id) in ( StreamClosedBy.RECV_RST_STREAM, StreamClosedBy.SEND_RST_STREAM, ) def _stream_is_closed_by_end(self, stream_id: int) -> bool: """ Returns ``True`` if the stream was closed by sending or receiving an END_STREAM flag in a HEADERS or DATA frame. Returns ``False`` otherwise. """ return self._stream_closed_by(stream_id) in ( StreamClosedBy.RECV_END_STREAM, StreamClosedBy.SEND_END_STREAM, ) def _add_frame_priority(frame: PriorityFrame | HeadersFrame, weight: int | None = None, depends_on: int | None = None, exclusive: bool | None = None) -> PriorityFrame | HeadersFrame: """ Adds priority data to a given frame. Does not change any flags set on that frame: if the caller is adding priority information to a HEADERS frame they must set that themselves. This method also deliberately sets defaults for anything missing. This method validates the input values. """ # A stream may not depend on itself. if depends_on == frame.stream_id: msg = f"Stream {frame.stream_id} may not depend on itself" raise ProtocolError(msg) # Weight must be between 1 and 256. if weight is not None: if weight > 256 or weight < 1: msg = f"Weight must be between 1 and 256, not {weight}" raise ProtocolError(msg) # Weight is an integer between 1 and 256, but the byte only allows # 0 to 255: subtract one. weight -= 1 # Set defaults for anything not provided. weight = weight if weight is not None else 15 depends_on = depends_on if depends_on is not None else 0 exclusive = exclusive if exclusive is not None else False frame.stream_weight = weight frame.depends_on = depends_on frame.exclusive = exclusive return frame def _decode_headers(decoder: Decoder, encoded_header_block: bytes) -> Iterable[Header]: """ Decode a HPACK-encoded header block, translating HPACK exceptions into sensible h2 errors. This only ever returns bytestring headers: h2 may emit them as unicode later, but internally it processes them as bytestrings only. """ try: return decoder.decode(encoded_header_block, raw=True) except OversizedHeaderListError as e: # This is a symptom of a HPACK bomb attack: the user has # disregarded our requirements on how large a header block we'll # accept. msg = f"Oversized header block: {e}" raise DenialOfServiceError(msg) from e except (HPACKError, IndexError, TypeError, UnicodeDecodeError) as e: # We should only need HPACKError here, but versions of HPACK older # than 2.1.0 throw all three others as well. For maximum # compatibility, catch all of them. msg = f"Error decoding header block: {e}" raise ProtocolError(msg) from e ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/src/h2/errors.py0000644000076500000240000000305514744265074014375 0ustar00kriechistaff""" h2/errors ~~~~~~~~~ Global error code registry containing the established HTTP/2 error codes. The current registry is available at: https://tools.ietf.org/html/rfc7540#section-11.4 """ from __future__ import annotations import enum class ErrorCodes(enum.IntEnum): """ All known HTTP/2 error codes. .. versionadded:: 2.5.0 """ #: Graceful shutdown. NO_ERROR = 0x0 #: Protocol error detected. PROTOCOL_ERROR = 0x1 #: Implementation fault. INTERNAL_ERROR = 0x2 #: Flow-control limits exceeded. FLOW_CONTROL_ERROR = 0x3 #: Settings not acknowledged. SETTINGS_TIMEOUT = 0x4 #: Frame received for closed stream. STREAM_CLOSED = 0x5 #: Frame size incorrect. FRAME_SIZE_ERROR = 0x6 #: Stream not processed. REFUSED_STREAM = 0x7 #: Stream cancelled. CANCEL = 0x8 #: Compression state not updated. COMPRESSION_ERROR = 0x9 #: TCP connection error for CONNECT method. CONNECT_ERROR = 0xa #: Processing capacity exceeded. ENHANCE_YOUR_CALM = 0xb #: Negotiated TLS parameters not acceptable. INADEQUATE_SECURITY = 0xc #: Use HTTP/1.1 for the request. HTTP_1_1_REQUIRED = 0xd def _error_code_from_int(code: int) -> ErrorCodes | int: """ Given an integer error code, returns either one of :class:`ErrorCodes ` or, if not present in the known set of codes, returns the integer directly. """ try: return ErrorCodes(code) except ValueError: return code __all__ = ["ErrorCodes"] ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/src/h2/events.py0000644000076500000240000005435414744265074014375 0ustar00kriechistaff""" h2/events ~~~~~~~~~ Defines Event types for HTTP/2. Events are returned by the H2 state machine to allow implementations to keep track of events triggered by receiving data. Each time data is provided to the H2 state machine it processes the data and returns a list of Event objects. """ from __future__ import annotations import binascii from typing import TYPE_CHECKING from .settings import ChangedSetting, SettingCodes, Settings, _setting_code_from_int if TYPE_CHECKING: # pragma: no cover from hpack import HeaderTuple from hyperframe.frame import Frame from .errors import ErrorCodes class Event: """ Base class for h2 events. """ class RequestReceived(Event): """ The RequestReceived event is fired whenever all of a request's headers are received. This event carries the HTTP headers for the given request and the stream ID of the new stream. In HTTP/2, headers may be sent as a HEADERS frame followed by zero or more CONTINUATION frames with the final frame setting the END_HEADERS flag. This event is fired after the entire sequence is received. .. versionchanged:: 2.3.0 Changed the type of ``headers`` to :class:`HeaderTuple `. This has no effect on current users. .. versionchanged:: 2.4.0 Added ``stream_ended`` and ``priority_updated`` properties. """ def __init__(self) -> None: #: The Stream ID for the stream this request was made on. self.stream_id: int | None = None #: The request headers. self.headers: list[HeaderTuple] | None = None #: If this request also ended the stream, the associated #: :class:`StreamEnded ` event will be available #: here. #: #: .. versionadded:: 2.4.0 self.stream_ended: StreamEnded | None = None #: If this request also had associated priority information, the #: associated :class:`PriorityUpdated ` #: event will be available here. #: #: .. versionadded:: 2.4.0 self.priority_updated: PriorityUpdated | None = None def __repr__(self) -> str: return f"" class ResponseReceived(Event): """ The ResponseReceived event is fired whenever response headers are received. This event carries the HTTP headers for the given response and the stream ID of the new stream. .. versionchanged:: 2.3.0 Changed the type of ``headers`` to :class:`HeaderTuple `. This has no effect on current users. .. versionchanged:: 2.4.0 Added ``stream_ended`` and ``priority_updated`` properties. """ def __init__(self) -> None: #: The Stream ID for the stream this response was made on. self.stream_id: int | None = None #: The response headers. self.headers: list[HeaderTuple] | None = None #: If this response also ended the stream, the associated #: :class:`StreamEnded ` event will be available #: here. #: #: .. versionadded:: 2.4.0 self.stream_ended: StreamEnded | None = None #: If this response also had associated priority information, the #: associated :class:`PriorityUpdated ` #: event will be available here. #: #: .. versionadded:: 2.4.0 self.priority_updated: PriorityUpdated | None = None def __repr__(self) -> str: return f"" class TrailersReceived(Event): """ The TrailersReceived event is fired whenever trailers are received on a stream. Trailers are a set of headers sent after the body of the request/response, and are used to provide information that wasn't known ahead of time (e.g. content-length). This event carries the HTTP header fields that form the trailers and the stream ID of the stream on which they were received. .. versionchanged:: 2.3.0 Changed the type of ``headers`` to :class:`HeaderTuple `. This has no effect on current users. .. versionchanged:: 2.4.0 Added ``stream_ended`` and ``priority_updated`` properties. """ def __init__(self) -> None: #: The Stream ID for the stream on which these trailers were received. self.stream_id: int | None = None #: The trailers themselves. self.headers: list[HeaderTuple] | None = None #: Trailers always end streams. This property has the associated #: :class:`StreamEnded ` in it. #: #: .. versionadded:: 2.4.0 self.stream_ended: StreamEnded | None = None #: If the trailers also set associated priority information, the #: associated :class:`PriorityUpdated ` #: event will be available here. #: #: .. versionadded:: 2.4.0 self.priority_updated: PriorityUpdated | None = None def __repr__(self) -> str: return f"" class _HeadersSent(Event): """ The _HeadersSent event is fired whenever headers are sent. This is an internal event, used to determine validation steps on outgoing header blocks. """ class _ResponseSent(_HeadersSent): """ The _ResponseSent event is fired whenever response headers are sent on a stream. This is an internal event, used to determine validation steps on outgoing header blocks. """ class _RequestSent(_HeadersSent): """ The _RequestSent event is fired whenever request headers are sent on a stream. This is an internal event, used to determine validation steps on outgoing header blocks. """ class _TrailersSent(_HeadersSent): """ The _TrailersSent event is fired whenever trailers are sent on a stream. Trailers are a set of headers sent after the body of the request/response, and are used to provide information that wasn't known ahead of time (e.g. content-length). This is an internal event, used to determine validation steps on outgoing header blocks. """ class _PushedRequestSent(_HeadersSent): """ The _PushedRequestSent event is fired whenever pushed request headers are sent. This is an internal event, used to determine validation steps on outgoing header blocks. """ class InformationalResponseReceived(Event): """ The InformationalResponseReceived event is fired when an informational response (that is, one whose status code is a 1XX code) is received from the remote peer. The remote peer may send any number of these, from zero upwards. These responses are most commonly sent in response to requests that have the ``expect: 100-continue`` header field present. Most users can safely ignore this event unless you are intending to use the ``expect: 100-continue`` flow, or are for any reason expecting a different 1XX status code. .. versionadded:: 2.2.0 .. versionchanged:: 2.3.0 Changed the type of ``headers`` to :class:`HeaderTuple `. This has no effect on current users. .. versionchanged:: 2.4.0 Added ``priority_updated`` property. """ def __init__(self) -> None: #: The Stream ID for the stream this informational response was made #: on. self.stream_id: int | None = None #: The headers for this informational response. self.headers: list[HeaderTuple] | None = None #: If this response also had associated priority information, the #: associated :class:`PriorityUpdated ` #: event will be available here. #: #: .. versionadded:: 2.4.0 self.priority_updated: PriorityUpdated | None = None def __repr__(self) -> str: return f"" class DataReceived(Event): """ The DataReceived event is fired whenever data is received on a stream from the remote peer. The event carries the data itself, and the stream ID on which the data was received. .. versionchanged:: 2.4.0 Added ``stream_ended`` property. """ def __init__(self) -> None: #: The Stream ID for the stream this data was received on. self.stream_id: int | None = None #: The data itself. self.data: bytes | None = None #: The amount of data received that counts against the flow control #: window. Note that padding counts against the flow control window, so #: when adjusting flow control you should always use this field rather #: than ``len(data)``. self.flow_controlled_length: int | None = None #: If this data chunk also completed the stream, the associated #: :class:`StreamEnded ` event will be available #: here. #: #: .. versionadded:: 2.4.0 self.stream_ended: StreamEnded | None = None def __repr__(self) -> str: return ( "".format( self.stream_id, self.flow_controlled_length, _bytes_representation(self.data[:20]) if self.data else "", ) ) class WindowUpdated(Event): """ The WindowUpdated event is fired whenever a flow control window changes size. HTTP/2 defines flow control windows for connections and streams: this event fires for both connections and streams. The event carries the ID of the stream to which it applies (set to zero if the window update applies to the connection), and the delta in the window size. """ def __init__(self) -> None: #: The Stream ID of the stream whose flow control window was changed. #: May be ``0`` if the connection window was changed. self.stream_id: int | None = None #: The window delta. self.delta: int | None = None def __repr__(self) -> str: return f"" class RemoteSettingsChanged(Event): """ The RemoteSettingsChanged event is fired whenever the remote peer changes its settings. It contains a complete inventory of changed settings, including their previous values. In HTTP/2, settings changes need to be acknowledged. h2 automatically acknowledges settings changes for efficiency. However, it is possible that the caller may not be happy with the changed setting. When this event is received, the caller should confirm that the new settings are acceptable. If they are not acceptable, the user should close the connection with the error code :data:`PROTOCOL_ERROR `. .. versionchanged:: 2.0.0 Prior to this version the user needed to acknowledge settings changes. This is no longer the case: h2 now automatically acknowledges them. """ def __init__(self) -> None: #: A dictionary of setting byte to #: :class:`ChangedSetting `, representing #: the changed settings. self.changed_settings: dict[int, ChangedSetting] = {} @classmethod def from_settings(cls, old_settings: Settings | dict[int, int], new_settings: dict[int, int]) -> RemoteSettingsChanged: """ Build a RemoteSettingsChanged event from a set of changed settings. :param old_settings: A complete collection of old settings, in the form of a dictionary of ``{setting: value}``. :param new_settings: All the changed settings and their new values, in the form of a dictionary of ``{setting: value}``. """ e = cls() for setting, new_value in new_settings.items(): s = _setting_code_from_int(setting) original_value = old_settings.get(s) change = ChangedSetting(s, original_value, new_value) e.changed_settings[s] = change return e def __repr__(self) -> str: return "".format( ", ".join(repr(cs) for cs in self.changed_settings.values()), ) class PingReceived(Event): """ The PingReceived event is fired whenever a PING is received. It contains the 'opaque data' of the PING frame. A ping acknowledgment with the same 'opaque data' is automatically emitted after receiving a ping. .. versionadded:: 3.1.0 """ def __init__(self) -> None: #: The data included on the ping. self.ping_data: bytes | None = None def __repr__(self) -> str: return f"" class PingAckReceived(Event): """ The PingAckReceived event is fired whenever a PING acknowledgment is received. It contains the 'opaque data' of the PING+ACK frame, allowing the user to correlate PINGs and calculate RTT. .. versionadded:: 3.1.0 .. versionchanged:: 4.0.0 Removed deprecated but equivalent ``PingAcknowledged``. """ def __init__(self) -> None: #: The data included on the ping. self.ping_data: bytes | None = None def __repr__(self) -> str: return f"" class StreamEnded(Event): """ The StreamEnded event is fired whenever a stream is ended by a remote party. The stream may not be fully closed if it has not been closed locally, but no further data or headers should be expected on that stream. """ def __init__(self) -> None: #: The Stream ID of the stream that was closed. self.stream_id: int | None = None def __repr__(self) -> str: return f"" class StreamReset(Event): """ The StreamReset event is fired in two situations. The first is when the remote party forcefully resets the stream. The second is when the remote party has made a protocol error which only affects a single stream. In this case, h2 will terminate the stream early and return this event. .. versionchanged:: 2.0.0 This event is now fired when h2 automatically resets a stream. """ def __init__(self) -> None: #: The Stream ID of the stream that was reset. self.stream_id: int | None = None #: The error code given. Either one of :class:`ErrorCodes #: ` or ``int`` self.error_code: ErrorCodes | None = None #: Whether the remote peer sent a RST_STREAM or we did. self.remote_reset = True def __repr__(self) -> str: return f"" class PushedStreamReceived(Event): """ The PushedStreamReceived event is fired whenever a pushed stream has been received from a remote peer. The event carries on it the new stream ID, the ID of the parent stream, and the request headers pushed by the remote peer. """ def __init__(self) -> None: #: The Stream ID of the stream created by the push. self.pushed_stream_id: int | None = None #: The Stream ID of the stream that the push is related to. self.parent_stream_id: int | None = None #: The request headers, sent by the remote party in the push. self.headers: list[HeaderTuple] | None = None def __repr__(self) -> str: return ( f"" ) class SettingsAcknowledged(Event): """ The SettingsAcknowledged event is fired whenever a settings ACK is received from the remote peer. The event carries on it the settings that were acknowedged, in the same format as :class:`h2.events.RemoteSettingsChanged`. """ def __init__(self) -> None: #: A dictionary of setting byte to #: :class:`ChangedSetting `, representing #: the changed settings. self.changed_settings: dict[SettingCodes | int, ChangedSetting] = {} def __repr__(self) -> str: s = ", ".join(repr(cs) for cs in self.changed_settings.values()) return f"" class PriorityUpdated(Event): """ The PriorityUpdated event is fired whenever a stream sends updated priority information. This can occur when the stream is opened, or at any time during the stream lifetime. This event is purely advisory, and does not need to be acted on. .. versionadded:: 2.0.0 """ def __init__(self) -> None: #: The ID of the stream whose priority information is being updated. self.stream_id: int | None = None #: The new stream weight. May be the same as the original stream #: weight. An integer between 1 and 256. self.weight: int | None = None #: The stream ID this stream now depends on. May be ``0``. self.depends_on: int | None = None #: Whether the stream *exclusively* depends on the parent stream. If it #: does, this stream should inherit the current children of its new #: parent. self.exclusive: bool | None = None def __repr__(self) -> str: return ( f"" ) class ConnectionTerminated(Event): """ The ConnectionTerminated event is fired when a connection is torn down by the remote peer using a GOAWAY frame. Once received, no further action may be taken on the connection: a new connection must be established. """ def __init__(self) -> None: #: The error code cited when tearing down the connection. Should be #: one of :class:`ErrorCodes `, but may not be if #: unknown HTTP/2 extensions are being used. self.error_code: ErrorCodes | int | None = None #: The stream ID of the last stream the remote peer saw. This can #: provide an indication of what data, if any, never reached the remote #: peer and so can safely be resent. self.last_stream_id: int | None = None #: Additional debug data that can be appended to GOAWAY frame. self.additional_data: bytes | None = None def __repr__(self) -> str: return ( "".format( self.error_code, self.last_stream_id, _bytes_representation( self.additional_data[:20] if self.additional_data else None), ) ) class AlternativeServiceAvailable(Event): """ The AlternativeServiceAvailable event is fired when the remote peer advertises an `RFC 7838 `_ Alternative Service using an ALTSVC frame. This event always carries the origin to which the ALTSVC information applies. That origin is either supplied by the server directly, or inferred by h2 from the ``:authority`` pseudo-header field that was sent by the user when initiating a given stream. This event also carries what RFC 7838 calls the "Alternative Service Field Value", which is formatted like a HTTP header field and contains the relevant alternative service information. h2 does not parse or in any way modify that information: the user is required to do that. This event can only be fired on the client end of a connection. .. versionadded:: 2.3.0 """ def __init__(self) -> None: #: The origin to which the alternative service field value applies. #: This field is either supplied by the server directly, or inferred by #: h2 from the ``:authority`` pseudo-header field that was sent #: by the user when initiating the stream on which the frame was #: received. self.origin: bytes | None = None #: The ALTSVC field value. This contains information about the HTTP #: alternative service being advertised by the server. h2 does #: not parse this field: it is left exactly as sent by the server. The #: structure of the data in this field is given by `RFC 7838 Section 3 #: `_. self.field_value: bytes | None = None def __repr__(self) -> str: return ( "".format( (self.origin or b"").decode("utf-8", "ignore"), (self.field_value or b"").decode("utf-8", "ignore"), ) ) class UnknownFrameReceived(Event): """ The UnknownFrameReceived event is fired when the remote peer sends a frame that h2 does not understand. This occurs primarily when the remote peer is employing HTTP/2 extensions that h2 doesn't know anything about. RFC 7540 requires that HTTP/2 implementations ignore these frames. h2 does so. However, this event is fired to allow implementations to perform special processing on those frames if needed (e.g. if the implementation is capable of handling the frame itself). .. versionadded:: 2.7.0 """ def __init__(self) -> None: #: The hyperframe Frame object that encapsulates the received frame. self.frame: Frame | None = None def __repr__(self) -> str: return "" def _bytes_representation(data: bytes | None) -> str | None: """ Converts a bytestring into something that is safe to print on all Python platforms. This function is relatively expensive, so it should not be called on the mainline of the code. It's safe to use in things like object repr methods though. """ if data is None: return None return binascii.hexlify(data).decode("ascii") ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/src/h2/exceptions.py0000644000076500000240000001227414744265074015245 0ustar00kriechistaff""" h2/exceptions ~~~~~~~~~~~~~ Exceptions for the HTTP/2 module. """ from __future__ import annotations from .errors import ErrorCodes class H2Error(Exception): """ The base class for all exceptions for the HTTP/2 module. """ class ProtocolError(H2Error): """ An action was attempted in violation of the HTTP/2 protocol. """ #: The error code corresponds to this kind of Protocol Error. error_code = ErrorCodes.PROTOCOL_ERROR class FrameTooLargeError(ProtocolError): """ The frame that we tried to send or that we received was too large. """ #: The error code corresponds to this kind of Protocol Error. error_code = ErrorCodes.FRAME_SIZE_ERROR class FrameDataMissingError(ProtocolError): """ The frame that we received is missing some data. .. versionadded:: 2.0.0 """ #: The error code corresponds to this kind of Protocol Error. error_code = ErrorCodes.FRAME_SIZE_ERROR class TooManyStreamsError(ProtocolError): """ An attempt was made to open a stream that would lead to too many concurrent streams. """ class FlowControlError(ProtocolError): """ An attempted action violates flow control constraints. """ #: The error code corresponds to this kind of Protocol Error. error_code = ErrorCodes.FLOW_CONTROL_ERROR class StreamIDTooLowError(ProtocolError): """ An attempt was made to open a stream that had an ID that is lower than the highest ID we have seen on this connection. """ def __init__(self, stream_id: int, max_stream_id: int) -> None: #: The ID of the stream that we attempted to open. self.stream_id = stream_id #: The current highest-seen stream ID. self.max_stream_id = max_stream_id def __str__(self) -> str: return f"StreamIDTooLowError: {self.stream_id} is lower than {self.max_stream_id}" class NoAvailableStreamIDError(ProtocolError): """ There are no available stream IDs left to the connection. All stream IDs have been exhausted. .. versionadded:: 2.0.0 """ class NoSuchStreamError(ProtocolError): """ A stream-specific action referenced a stream that does not exist. .. versionchanged:: 2.0.0 Became a subclass of :class:`ProtocolError ` """ def __init__(self, stream_id: int) -> None: #: The stream ID corresponds to the non-existent stream. self.stream_id = stream_id class StreamClosedError(NoSuchStreamError): """ A more specific form of :class:`NoSuchStreamError `. Indicates that the stream has since been closed, and that all state relating to that stream has been removed. """ def __init__(self, stream_id: int) -> None: #: The stream ID corresponds to the nonexistent stream. self.stream_id = stream_id #: The relevant HTTP/2 error code. self.error_code = ErrorCodes.STREAM_CLOSED # Any events that internal code may need to fire. Not relevant to # external users that may receive a StreamClosedError. self._events = [] # type: ignore class InvalidSettingsValueError(ProtocolError, ValueError): """ An attempt was made to set an invalid Settings value. .. versionadded:: 2.0.0 """ def __init__(self, msg: str, error_code: ErrorCodes) -> None: super().__init__(msg) self.error_code = error_code class InvalidBodyLengthError(ProtocolError): """ The remote peer sent more or less data that the Content-Length header indicated. .. versionadded:: 2.0.0 """ def __init__(self, expected: int, actual: int) -> None: self.expected_length = expected self.actual_length = actual def __str__(self) -> str: return f"InvalidBodyLengthError: Expected {self.expected_length} bytes, received {self.actual_length}" class UnsupportedFrameError(ProtocolError): """ The remote peer sent a frame that is unsupported in this context. .. versionadded:: 2.1.0 .. versionchanged:: 4.0.0 Removed deprecated KeyError parent class. """ class RFC1122Error(H2Error): """ Emitted when users attempt to do something that is literally allowed by the relevant RFC, but is sufficiently ill-defined that it's unwise to allow users to actually do it. While there is some disagreement about whether or not we should be liberal in what accept, it is a truth universally acknowledged that we should be conservative in what emit. .. versionadded:: 2.4.0 """ # shazow says I'm going to regret naming the exception this way. If that # turns out to be true, TELL HIM NOTHING. class DenialOfServiceError(ProtocolError): """ Emitted when the remote peer exhibits a behaviour that is likely to be an attempt to perform a Denial of Service attack on the implementation. This is a form of ProtocolError that carries a different error code, and allows more easy detection of this kind of behaviour. .. versionadded:: 2.5.0 """ #: The error code corresponds to this kind of #: :class:`ProtocolError ` error_code = ErrorCodes.ENHANCE_YOUR_CALM ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/src/h2/frame_buffer.py0000644000076500000240000001461114744265074015504 0ustar00kriechistaff""" h2/frame_buffer ~~~~~~~~~~~~~~~ A data structure that provides a way to iterate over a byte buffer in terms of frames. """ from __future__ import annotations from hyperframe.exceptions import InvalidDataError, InvalidFrameError from hyperframe.frame import ContinuationFrame, Frame, HeadersFrame, PushPromiseFrame from .exceptions import FrameDataMissingError, FrameTooLargeError, ProtocolError # To avoid a DOS attack based on sending loads of continuation frames, we limit # the maximum number we're perpared to receive. In this case, we'll set the # limit to 64, which means the largest encoded header block we can receive by # default is 262144 bytes long, and the largest possible *at all* is 1073741760 # bytes long. # # This value seems reasonable for now, but in future we may want to evaluate # making it configurable. CONTINUATION_BACKLOG = 64 class FrameBuffer: """ A buffer data structure for HTTP/2 data that allows iteraton in terms of H2 frames. """ def __init__(self, server: bool = False) -> None: self.data = b"" self.max_frame_size = 0 self._preamble = b"PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n" if server else b"" self._preamble_len = len(self._preamble) self._headers_buffer: list[HeadersFrame | ContinuationFrame | PushPromiseFrame] = [] def add_data(self, data: bytes) -> None: """ Add more data to the frame buffer. :param data: A bytestring containing the byte buffer. """ if self._preamble_len: data_len = len(data) of_which_preamble = min(self._preamble_len, data_len) if self._preamble[:of_which_preamble] != data[:of_which_preamble]: msg = "Invalid HTTP/2 preamble." raise ProtocolError(msg) data = data[of_which_preamble:] self._preamble_len -= of_which_preamble self._preamble = self._preamble[of_which_preamble:] self.data += data def _validate_frame_length(self, length: int) -> None: """ Confirm that the frame is an appropriate length. """ if length > self.max_frame_size: msg = f"Received overlong frame: length {length}, max {self.max_frame_size}" raise FrameTooLargeError(msg) def _update_header_buffer(self, f: Frame | None) -> Frame | None: """ Updates the internal header buffer. Returns a frame that should replace the current one. May throw exceptions if this frame is invalid. """ # Check if we're in the middle of a headers block. If we are, this # frame *must* be a CONTINUATION frame with the same stream ID as the # leading HEADERS or PUSH_PROMISE frame. Anything else is a # ProtocolError. If the frame *is* valid, append it to the header # buffer. if self._headers_buffer: stream_id = self._headers_buffer[0].stream_id valid_frame = ( f is not None and isinstance(f, ContinuationFrame) and f.stream_id == stream_id ) if not valid_frame: msg = "Invalid frame during header block." raise ProtocolError(msg) assert isinstance(f, ContinuationFrame) # Append the frame to the buffer. self._headers_buffer.append(f) if len(self._headers_buffer) > CONTINUATION_BACKLOG: msg = "Too many continuation frames received." raise ProtocolError(msg) # If this is the end of the header block, then we want to build a # mutant HEADERS frame that's massive. Use the original one we got, # then set END_HEADERS and set its data appopriately. If it's not # the end of the block, lose the current frame: we can't yield it. if "END_HEADERS" in f.flags: f = self._headers_buffer[0] f.flags.add("END_HEADERS") f.data = b"".join(x.data for x in self._headers_buffer) self._headers_buffer = [] else: f = None elif (isinstance(f, (HeadersFrame, PushPromiseFrame)) and "END_HEADERS" not in f.flags): # This is the start of a headers block! Save the frame off and then # act like we didn't receive one. self._headers_buffer.append(f) f = None return f # The methods below support the iterator protocol. def __iter__(self) -> FrameBuffer: return self def __next__(self) -> Frame: # First, check that we have enough data to successfully parse the # next frame header. If not, bail. Otherwise, parse it. if len(self.data) < 9: raise StopIteration try: f, length = Frame.parse_frame_header(memoryview(self.data[:9])) except (InvalidDataError, InvalidFrameError) as err: # pragma: no cover msg = f"Received frame with invalid header: {err!s}" raise ProtocolError(msg) from err # Next, check that we have enough length to parse the frame body. If # not, bail, leaving the frame header data in the buffer for next time. if len(self.data) < length + 9: raise StopIteration # Confirm the frame has an appropriate length. self._validate_frame_length(length) # Try to parse the frame body try: f.parse_body(memoryview(self.data[9:9+length])) except InvalidDataError as err: msg = "Received frame with non-compliant data" raise ProtocolError(msg) from err except InvalidFrameError as err: msg = "Frame data missing or invalid" raise FrameDataMissingError(msg) from err # At this point, as we know we'll use or discard the entire frame, we # can update the data. self.data = self.data[9+length:] # Pass the frame through the header buffer. new_frame = self._update_header_buffer(f) # If we got a frame we didn't understand or shouldn't yield, rather # than return None it'd be better if we just tried to get the next # frame in the sequence instead. Recurse back into ourselves to do # that. This is safe because the amount of work we have to do here is # strictly bounded by the length of the buffer. return new_frame if new_frame is not None else self.__next__() ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/src/h2/py.typed0000644000076500000240000000000014744265074014171 0ustar00kriechistaff././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/src/h2/settings.py0000644000076500000240000003004314744265074014716 0ustar00kriechistaff""" h2/settings ~~~~~~~~~~~ This module contains a HTTP/2 settings object. This object provides a simple API for manipulating HTTP/2 settings, keeping track of both the current active state of the settings and the unacknowledged future values of the settings. """ from __future__ import annotations import collections import enum from collections.abc import Iterator, MutableMapping from typing import Union from hyperframe.frame import SettingsFrame from .errors import ErrorCodes from .exceptions import InvalidSettingsValueError class SettingCodes(enum.IntEnum): """ All known HTTP/2 setting codes. .. versionadded:: 2.6.0 """ #: Allows the sender to inform the remote endpoint of the maximum size of #: the header compression table used to decode header blocks, in octets. HEADER_TABLE_SIZE = SettingsFrame.HEADER_TABLE_SIZE #: This setting can be used to disable server push. To disable server push #: on a client, set this to 0. ENABLE_PUSH = SettingsFrame.ENABLE_PUSH #: Indicates the maximum number of concurrent streams that the sender will #: allow. MAX_CONCURRENT_STREAMS = SettingsFrame.MAX_CONCURRENT_STREAMS #: Indicates the sender's initial window size (in octets) for stream-level #: flow control. INITIAL_WINDOW_SIZE = SettingsFrame.INITIAL_WINDOW_SIZE #: Indicates the size of the largest frame payload that the sender is #: willing to receive, in octets. MAX_FRAME_SIZE = SettingsFrame.MAX_FRAME_SIZE #: This advisory setting informs a peer of the maximum size of header list #: that the sender is prepared to accept, in octets. The value is based on #: the uncompressed size of header fields, including the length of the name #: and value in octets plus an overhead of 32 octets for each header field. MAX_HEADER_LIST_SIZE = SettingsFrame.MAX_HEADER_LIST_SIZE #: This setting can be used to enable the connect protocol. To enable on a #: client set this to 1. ENABLE_CONNECT_PROTOCOL = SettingsFrame.ENABLE_CONNECT_PROTOCOL def _setting_code_from_int(code: int) -> SettingCodes | int: """ Given an integer setting code, returns either one of :class:`SettingCodes ` or, if not present in the known set of codes, returns the integer directly. """ try: return SettingCodes(code) except ValueError: return code class ChangedSetting: def __init__(self, setting: SettingCodes | int, original_value: int | None, new_value: int) -> None: #: The setting code given. Either one of :class:`SettingCodes #: ` or ``int`` #: #: .. versionchanged:: 2.6.0 self.setting = setting #: The original value before being changed. self.original_value = original_value #: The new value after being changed. self.new_value = new_value def __repr__(self) -> str: return ( f"ChangedSetting(setting={self.setting!s}, original_value={self.original_value}, new_value={self.new_value})" ) class Settings(MutableMapping[Union[SettingCodes, int], int]): """ An object that encapsulates HTTP/2 settings state. HTTP/2 Settings are a complex beast. Each party, remote and local, has its own settings and a view of the other party's settings. When a settings frame is emitted by a peer it cannot assume that the new settings values are in place until the remote peer acknowledges the setting. In principle, multiple settings changes can be "in flight" at the same time, all with different values. This object encapsulates this mess. It provides a dict-like interface to settings, which return the *current* values of the settings in question. Additionally, it keeps track of the stack of proposed values: each time an acknowledgement is sent/received, it updates the current values with the stack of proposed values. On top of all that, it validates the values to make sure they're allowed, and raises :class:`InvalidSettingsValueError ` if they are not. Finally, this object understands what the default values of the HTTP/2 settings are, and sets those defaults appropriately. .. versionchanged:: 2.2.0 Added the ``initial_values`` parameter. .. versionchanged:: 2.5.0 Added the ``max_header_list_size`` property. :param client: (optional) Whether these settings should be defaulted for a client implementation or a server implementation. Defaults to ``True``. :type client: ``bool`` :param initial_values: (optional) Any initial values the user would like set, rather than RFC 7540's defaults. :type initial_vales: ``MutableMapping`` """ def __init__(self, client: bool = True, initial_values: dict[SettingCodes, int] | None = None) -> None: # Backing object for the settings. This is a dictionary of # (setting: [list of values]), where the first value in the list is the # current value of the setting. Strictly this doesn't use lists but # instead uses collections.deque to avoid repeated memory allocations. # # This contains the default values for HTTP/2. self._settings: dict[SettingCodes | int, collections.deque[int]] = { SettingCodes.HEADER_TABLE_SIZE: collections.deque([4096]), SettingCodes.ENABLE_PUSH: collections.deque([int(client)]), SettingCodes.INITIAL_WINDOW_SIZE: collections.deque([65535]), SettingCodes.MAX_FRAME_SIZE: collections.deque([16384]), SettingCodes.ENABLE_CONNECT_PROTOCOL: collections.deque([0]), } if initial_values is not None: for key, value in initial_values.items(): invalid = _validate_setting(key, value) if invalid: msg = f"Setting {key} has invalid value {value}" raise InvalidSettingsValueError( msg, error_code=invalid, ) self._settings[key] = collections.deque([value]) def acknowledge(self) -> dict[SettingCodes | int, ChangedSetting]: """ The settings have been acknowledged, either by the user (remote settings) or by the remote peer (local settings). :returns: A dict of {setting: ChangedSetting} that were applied. """ changed_settings: dict[SettingCodes | int, ChangedSetting] = {} # If there is more than one setting in the list, we have a setting # value outstanding. Update them. for k, v in self._settings.items(): if len(v) > 1: old_setting = v.popleft() new_setting = v[0] changed_settings[k] = ChangedSetting( k, old_setting, new_setting, ) return changed_settings # Provide easy-access to well known settings. @property def header_table_size(self) -> int: """ The current value of the :data:`HEADER_TABLE_SIZE ` setting. """ return self[SettingCodes.HEADER_TABLE_SIZE] @header_table_size.setter def header_table_size(self, value: int) -> None: self[SettingCodes.HEADER_TABLE_SIZE] = value @property def enable_push(self) -> int: """ The current value of the :data:`ENABLE_PUSH ` setting. """ return self[SettingCodes.ENABLE_PUSH] @enable_push.setter def enable_push(self, value: int) -> None: self[SettingCodes.ENABLE_PUSH] = value @property def initial_window_size(self) -> int: """ The current value of the :data:`INITIAL_WINDOW_SIZE ` setting. """ return self[SettingCodes.INITIAL_WINDOW_SIZE] @initial_window_size.setter def initial_window_size(self, value: int) -> None: self[SettingCodes.INITIAL_WINDOW_SIZE] = value @property def max_frame_size(self) -> int: """ The current value of the :data:`MAX_FRAME_SIZE ` setting. """ return self[SettingCodes.MAX_FRAME_SIZE] @max_frame_size.setter def max_frame_size(self, value: int) -> None: self[SettingCodes.MAX_FRAME_SIZE] = value @property def max_concurrent_streams(self) -> int: """ The current value of the :data:`MAX_CONCURRENT_STREAMS ` setting. """ return self.get(SettingCodes.MAX_CONCURRENT_STREAMS, 2**32+1) @max_concurrent_streams.setter def max_concurrent_streams(self, value: int) -> None: self[SettingCodes.MAX_CONCURRENT_STREAMS] = value @property def max_header_list_size(self) -> int | None: """ The current value of the :data:`MAX_HEADER_LIST_SIZE ` setting. If not set, returns ``None``, which means unlimited. .. versionadded:: 2.5.0 """ return self.get(SettingCodes.MAX_HEADER_LIST_SIZE, None) @max_header_list_size.setter def max_header_list_size(self, value: int) -> None: self[SettingCodes.MAX_HEADER_LIST_SIZE] = value @property def enable_connect_protocol(self) -> int: """ The current value of the :data:`ENABLE_CONNECT_PROTOCOL ` setting. """ return self[SettingCodes.ENABLE_CONNECT_PROTOCOL] @enable_connect_protocol.setter def enable_connect_protocol(self, value: int) -> None: self[SettingCodes.ENABLE_CONNECT_PROTOCOL] = value # Implement the MutableMapping API. def __getitem__(self, key: SettingCodes | int) -> int: val = self._settings[key][0] # Things that were created when a setting was received should stay # KeyError'd. if val is None: raise KeyError return val def __setitem__(self, key: SettingCodes | int, value: int) -> None: invalid = _validate_setting(key, value) if invalid: msg = f"Setting {key} has invalid value {value}" raise InvalidSettingsValueError( msg, error_code=invalid, ) try: items = self._settings[key] except KeyError: items = collections.deque([None]) # type: ignore self._settings[key] = items items.append(value) def __delitem__(self, key: SettingCodes | int) -> None: del self._settings[key] def __iter__(self) -> Iterator[SettingCodes | int]: return self._settings.__iter__() def __len__(self) -> int: return len(self._settings) def __eq__(self, other: object) -> bool: if isinstance(other, Settings): return self._settings == other._settings return NotImplemented def __ne__(self, other: object) -> bool: if isinstance(other, Settings): return not self == other return NotImplemented def _validate_setting(setting: SettingCodes | int, value: int) -> ErrorCodes: """ Confirms that a specific setting has a well-formed value. If the setting is invalid, returns an error code. Otherwise, returns 0 (NO_ERROR). """ if setting == SettingCodes.ENABLE_PUSH: if value not in (0, 1): return ErrorCodes.PROTOCOL_ERROR elif setting == SettingCodes.INITIAL_WINDOW_SIZE: if not 0 <= value <= 2147483647: # 2^31 - 1 return ErrorCodes.FLOW_CONTROL_ERROR elif setting == SettingCodes.MAX_FRAME_SIZE: if not 16384 <= value <= 16777215: # 2^14 and 2^24 - 1 return ErrorCodes.PROTOCOL_ERROR elif setting == SettingCodes.MAX_HEADER_LIST_SIZE: if value < 0: return ErrorCodes.PROTOCOL_ERROR elif setting == SettingCodes.ENABLE_CONNECT_PROTOCOL and value not in (0, 1): return ErrorCodes.PROTOCOL_ERROR return ErrorCodes.NO_ERROR ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/src/h2/stream.py0000644000076500000240000016115314744265074014360 0ustar00kriechistaff""" h2/stream ~~~~~~~~~ An implementation of a HTTP/2 stream. """ from __future__ import annotations from enum import Enum, IntEnum from typing import TYPE_CHECKING, Any from hpack import HeaderTuple from hyperframe.frame import AltSvcFrame, ContinuationFrame, DataFrame, Frame, HeadersFrame, PushPromiseFrame, RstStreamFrame, WindowUpdateFrame from .errors import ErrorCodes, _error_code_from_int from .events import ( AlternativeServiceAvailable, DataReceived, Event, InformationalResponseReceived, PushedStreamReceived, RequestReceived, ResponseReceived, StreamEnded, StreamReset, TrailersReceived, WindowUpdated, _PushedRequestSent, _RequestSent, _ResponseSent, _TrailersSent, ) from .exceptions import FlowControlError, InvalidBodyLengthError, ProtocolError, StreamClosedError from .utilities import ( HeaderValidationFlags, authority_from_headers, extract_method_header, guard_increment_window, is_informational_response, normalize_inbound_headers, normalize_outbound_headers, utf8_encode_headers, validate_headers, validate_outbound_headers, ) from .windows import WindowManager if TYPE_CHECKING: # pragma: no cover from collections.abc import Generator, Iterable from hpack.hpack import Encoder from hpack.struct import Header, HeaderWeaklyTyped from .config import H2Configuration class StreamState(IntEnum): IDLE = 0 RESERVED_REMOTE = 1 RESERVED_LOCAL = 2 OPEN = 3 HALF_CLOSED_REMOTE = 4 HALF_CLOSED_LOCAL = 5 CLOSED = 6 class StreamInputs(Enum): SEND_HEADERS = 0 SEND_PUSH_PROMISE = 1 SEND_RST_STREAM = 2 SEND_DATA = 3 SEND_WINDOW_UPDATE = 4 SEND_END_STREAM = 5 RECV_HEADERS = 6 RECV_PUSH_PROMISE = 7 RECV_RST_STREAM = 8 RECV_DATA = 9 RECV_WINDOW_UPDATE = 10 RECV_END_STREAM = 11 RECV_CONTINUATION = 12 # Added in 2.0.0 SEND_INFORMATIONAL_HEADERS = 13 # Added in 2.2.0 RECV_INFORMATIONAL_HEADERS = 14 # Added in 2.2.0 SEND_ALTERNATIVE_SERVICE = 15 # Added in 2.3.0 RECV_ALTERNATIVE_SERVICE = 16 # Added in 2.3.0 UPGRADE_CLIENT = 17 # Added 2.3.0 UPGRADE_SERVER = 18 # Added 2.3.0 class StreamClosedBy(Enum): SEND_END_STREAM = 0 RECV_END_STREAM = 1 SEND_RST_STREAM = 2 RECV_RST_STREAM = 3 # This array is initialized once, and is indexed by the stream states above. # It indicates whether a stream in the given state is open. The reason we do # this is that we potentially check whether a stream in a given state is open # quite frequently: given that we check so often, we should do so in the # fastest and most performant way possible. STREAM_OPEN = [False for _ in range(len(StreamState))] STREAM_OPEN[StreamState.OPEN] = True STREAM_OPEN[StreamState.HALF_CLOSED_LOCAL] = True STREAM_OPEN[StreamState.HALF_CLOSED_REMOTE] = True class H2StreamStateMachine: """ A single HTTP/2 stream state machine. This stream object implements basically the state machine described in RFC 7540 section 5.1. :param stream_id: The stream ID of this stream. This is stored primarily for logging purposes. """ def __init__(self, stream_id: int) -> None: self.state = StreamState.IDLE self.stream_id = stream_id #: Whether this peer is the client side of this stream. self.client: bool | None = None # Whether trailers have been sent/received on this stream or not. self.headers_sent: bool | None = None self.trailers_sent: bool | None = None self.headers_received: bool | None = None self.trailers_received: bool | None = None # How the stream was closed. One of StreamClosedBy. self.stream_closed_by: StreamClosedBy | None = None def process_input(self, input_: StreamInputs) -> Any: """ Process a specific input in the state machine. """ if not isinstance(input_, StreamInputs): msg = "Input must be an instance of StreamInputs" raise ValueError(msg) # noqa: TRY004 try: func, target_state = _transitions[(self.state, input_)] except KeyError as err: old_state = self.state self.state = StreamState.CLOSED msg = f"Invalid input {input_} in state {old_state}" raise ProtocolError(msg) from err else: previous_state = self.state self.state = target_state if func is not None: try: return func(self, previous_state) except ProtocolError: self.state = StreamState.CLOSED raise except AssertionError as err: # pragma: no cover self.state = StreamState.CLOSED raise ProtocolError(err) from err return [] def request_sent(self, previous_state: StreamState) -> list[Event]: """ Fires when a request is sent. """ self.client = True self.headers_sent = True event = _RequestSent() return [event] def response_sent(self, previous_state: StreamState) -> list[Event]: """ Fires when something that should be a response is sent. This 'response' may actually be trailers. """ if not self.headers_sent: if self.client is True or self.client is None: msg = "Client cannot send responses." raise ProtocolError(msg) self.headers_sent = True return [_ResponseSent()] assert not self.trailers_sent self.trailers_sent = True return [_TrailersSent()] def request_received(self, previous_state: StreamState) -> list[Event]: """ Fires when a request is received. """ assert not self.headers_received assert not self.trailers_received self.client = False self.headers_received = True event = RequestReceived() event.stream_id = self.stream_id return [event] def response_received(self, previous_state: StreamState) -> list[Event]: """ Fires when a response is received. Also disambiguates between responses and trailers. """ event: ResponseReceived | TrailersReceived if not self.headers_received: assert self.client is True self.headers_received = True event = ResponseReceived() else: assert not self.trailers_received self.trailers_received = True event = TrailersReceived() event.stream_id = self.stream_id return [event] def data_received(self, previous_state: StreamState) -> list[Event]: """ Fires when data is received. """ if not self.headers_received: msg = "cannot receive data before headers" raise ProtocolError(msg) event = DataReceived() event.stream_id = self.stream_id return [event] def window_updated(self, previous_state: StreamState) -> list[Event]: """ Fires when a window update frame is received. """ event = WindowUpdated() event.stream_id = self.stream_id return [event] def stream_half_closed(self, previous_state: StreamState) -> list[Event]: """ Fires when an END_STREAM flag is received in the OPEN state, transitioning this stream to a HALF_CLOSED_REMOTE state. """ event = StreamEnded() event.stream_id = self.stream_id return [event] def stream_ended(self, previous_state: StreamState) -> list[Event]: """ Fires when a stream is cleanly ended. """ self.stream_closed_by = StreamClosedBy.RECV_END_STREAM event = StreamEnded() event.stream_id = self.stream_id return [event] def stream_reset(self, previous_state: StreamState) -> list[Event]: """ Fired when a stream is forcefully reset. """ self.stream_closed_by = StreamClosedBy.RECV_RST_STREAM event = StreamReset() event.stream_id = self.stream_id return [event] def send_new_pushed_stream(self, previous_state: StreamState) -> list[Event]: """ Fires on the newly pushed stream, when pushed by the local peer. No event here, but definitionally this peer must be a server. """ assert self.client is None self.client = False self.headers_received = True return [] def recv_new_pushed_stream(self, previous_state: StreamState) -> list[Event]: """ Fires on the newly pushed stream, when pushed by the remote peer. No event here, but definitionally this peer must be a client. """ assert self.client is None self.client = True self.headers_sent = True return [] def send_push_promise(self, previous_state: StreamState) -> list[Event]: """ Fires on the already-existing stream when a PUSH_PROMISE frame is sent. We may only send PUSH_PROMISE frames if we're a server. """ if self.client is True: msg = "Cannot push streams from client peers." raise ProtocolError(msg) event = _PushedRequestSent() return [event] def recv_push_promise(self, previous_state: StreamState) -> list[Event]: """ Fires on the already-existing stream when a PUSH_PROMISE frame is received. We may only receive PUSH_PROMISE frames if we're a client. Fires a PushedStreamReceived event. """ if not self.client: if self.client is None: # pragma: no cover msg = "Idle streams cannot receive pushes" else: # pragma: no cover msg = "Cannot receive pushed streams as a server" raise ProtocolError(msg) event = PushedStreamReceived() event.parent_stream_id = self.stream_id return [event] def send_end_stream(self, previous_state: StreamState) -> None: """ Called when an attempt is made to send END_STREAM in the HALF_CLOSED_REMOTE state. """ self.stream_closed_by = StreamClosedBy.SEND_END_STREAM def send_reset_stream(self, previous_state: StreamState) -> None: """ Called when an attempt is made to send RST_STREAM in a non-closed stream state. """ self.stream_closed_by = StreamClosedBy.SEND_RST_STREAM def reset_stream_on_error(self, previous_state: StreamState) -> None: """ Called when we need to forcefully emit another RST_STREAM frame on behalf of the state machine. If this is the first time we've done this, we should also hang an event off the StreamClosedError so that the user can be informed. We know it's the first time we've done this if the stream is currently in a state other than CLOSED. """ self.stream_closed_by = StreamClosedBy.SEND_RST_STREAM error = StreamClosedError(self.stream_id) event = StreamReset() event.stream_id = self.stream_id event.error_code = ErrorCodes.STREAM_CLOSED event.remote_reset = False error._events = [event] raise error def recv_on_closed_stream(self, previous_state: StreamState) -> None: """ Called when an unexpected frame is received on an already-closed stream. An endpoint that receives an unexpected frame should treat it as a stream error or connection error with type STREAM_CLOSED, depending on the specific frame. The error handling is done at a higher level: this just raises the appropriate error. """ raise StreamClosedError(self.stream_id) def send_on_closed_stream(self, previous_state: StreamState) -> None: """ Called when an attempt is made to send data on an already-closed stream. This essentially overrides the standard logic by throwing a more-specific error: StreamClosedError. This is a ProtocolError, so it matches the standard API of the state machine, but provides more detail to the user. """ raise StreamClosedError(self.stream_id) def recv_push_on_closed_stream(self, previous_state: StreamState) -> None: """ Called when a PUSH_PROMISE frame is received on a full stop stream. If the stream was closed by us sending a RST_STREAM frame, then we presume that the PUSH_PROMISE was in flight when we reset the parent stream. Rathen than accept the new stream, we just reset it. Otherwise, we should call this a PROTOCOL_ERROR: pushing a stream on a naturally closed stream is a real problem because it creates a brand new stream that the remote peer now believes exists. """ assert self.stream_closed_by is not None if self.stream_closed_by == StreamClosedBy.SEND_RST_STREAM: raise StreamClosedError(self.stream_id) msg = "Attempted to push on closed stream." raise ProtocolError(msg) def send_push_on_closed_stream(self, previous_state: StreamState) -> None: """ Called when an attempt is made to push on an already-closed stream. This essentially overrides the standard logic by providing a more useful error message. It's necessary because simply indicating that the stream is closed is not enough: there is now a new stream that is not allowed to be there. The only recourse is to tear the whole connection down. """ msg = "Attempted to push on closed stream." raise ProtocolError(msg) def send_informational_response(self, previous_state: StreamState) -> list[Event]: """ Called when an informational header block is sent (that is, a block where the :status header has a 1XX value). Only enforces that these are sent *before* final headers are sent. """ if self.headers_sent: msg = "Information response after final response" raise ProtocolError(msg) event = _ResponseSent() return [event] def recv_informational_response(self, previous_state: StreamState) -> list[Event]: """ Called when an informational header block is received (that is, a block where the :status header has a 1XX value). """ if self.headers_received: msg = "Informational response after final response" raise ProtocolError(msg) event = InformationalResponseReceived() event.stream_id = self.stream_id return [event] def recv_alt_svc(self, previous_state: StreamState) -> list[Event]: """ Called when receiving an ALTSVC frame. RFC 7838 allows us to receive ALTSVC frames at any stream state, which is really absurdly overzealous. For that reason, we want to limit the states in which we can actually receive it. It's really only sensible to receive it after we've sent our own headers and before the server has sent its header block: the server can't guarantee that we have any state around after it completes its header block, and the server doesn't know what origin we're talking about before we've sent ours. For that reason, this function applies a few extra checks on both state and some of the little state variables we keep around. If those suggest an unreasonable situation for the ALTSVC frame to have been sent in, we quietly ignore it (as RFC 7838 suggests). This function is also *not* always called by the state machine. In some states (IDLE, RESERVED_LOCAL, CLOSED) we don't bother to call it, because we know the frame cannot be valid in that state (IDLE because the server cannot know what origin the stream applies to, CLOSED because the server cannot assume we still have state around, RESERVED_LOCAL because by definition if we're in the RESERVED_LOCAL state then *we* are the server). """ # Servers can't receive ALTSVC frames, but RFC 7838 tells us to ignore # them. if self.client is False: return [] # If we've received the response headers from the server they can't # guarantee we still have any state around. Other implementations # (like nghttp2) ignore ALTSVC in this state, so we will too. if self.headers_received: return [] # Otherwise, this is a sensible enough frame to have received. Return # the event and let it get populated. return [AlternativeServiceAvailable()] def send_alt_svc(self, previous_state: StreamState) -> None: """ Called when sending an ALTSVC frame on this stream. For consistency with the restrictions we apply on receiving ALTSVC frames in ``recv_alt_svc``, we want to restrict when users can send ALTSVC frames to the situations when we ourselves would accept them. That means: when we are a server, when we have received the request headers, and when we have not yet sent our own response headers. """ # We should not send ALTSVC after we've sent response headers, as the # client may have disposed of its state. if self.headers_sent: msg = "Cannot send ALTSVC after sending response headers." raise ProtocolError(msg) # STATE MACHINE # # The stream state machine is defined here to avoid the need to allocate it # repeatedly for each stream. It cannot be defined in the stream class because # it needs to be able to reference the callbacks defined on the class, but # because Python's scoping rules are weird the class object is not actually in # scope during the body of the class object. # # For the sake of clarity, we reproduce the RFC 7540 state machine here: # # +--------+ # send PP | | recv PP # ,--------| idle |--------. # / | | \ # v +--------+ v # +----------+ | +----------+ # | | | send H / | | # ,------| reserved | | recv H | reserved |------. # | | (local) | | | (remote) | | # | +----------+ v +----------+ | # | | +--------+ | | # | | recv ES | | send ES | | # | send H | ,-------| open |-------. | recv H | # | | / | | \ | | # | v v +--------+ v v | # | +----------+ | +----------+ | # | | half | | | half | | # | | closed | | send R / | closed | | # | | (remote) | | recv R | (local) | | # | +----------+ | +----------+ | # | | | | | # | | send ES / | recv ES / | | # | | send R / v send R / | | # | | recv R +--------+ recv R | | # | send R / `----------->| |<-----------' send R / | # | recv R | closed | recv R | # `----------------------->| |<----------------------' # +--------+ # # send: endpoint sends this frame # recv: endpoint receives this frame # # H: HEADERS frame (with implied CONTINUATIONs) # PP: PUSH_PROMISE frame (with implied CONTINUATIONs) # ES: END_STREAM flag # R: RST_STREAM frame # # For the purposes of this state machine we treat HEADERS and their # associated CONTINUATION frames as a single jumbo frame. The protocol # allows/requires this by preventing other frames from being interleved in # between HEADERS/CONTINUATION frames. However, if a CONTINUATION frame is # received without a prior HEADERS frame, it *will* be passed to this state # machine. The state machine should always reject that frame, either as an # invalid transition or because the stream is closed. # # There is a confusing relationship around PUSH_PROMISE frames. The state # machine above considers them to be frames belonging to the new stream, # which is *somewhat* true. However, they are sent with the stream ID of # their related stream, and are only sendable in some cases. # For this reason, our state machine implementation below allows for # PUSH_PROMISE frames both in the IDLE state (as in the diagram), but also # in the OPEN, HALF_CLOSED_LOCAL, and HALF_CLOSED_REMOTE states. # Essentially, for h2, PUSH_PROMISE frames are effectively sent on # two streams. # # The _transitions dictionary contains a mapping of tuples of # (state, input) to tuples of (side_effect_function, end_state). This # map contains all allowed transitions: anything not in this map is # invalid and immediately causes a transition to ``closed``. _transitions = { # State: idle (StreamState.IDLE, StreamInputs.SEND_HEADERS): (H2StreamStateMachine.request_sent, StreamState.OPEN), (StreamState.IDLE, StreamInputs.RECV_HEADERS): (H2StreamStateMachine.request_received, StreamState.OPEN), (StreamState.IDLE, StreamInputs.RECV_DATA): (H2StreamStateMachine.reset_stream_on_error, StreamState.CLOSED), (StreamState.IDLE, StreamInputs.SEND_PUSH_PROMISE): (H2StreamStateMachine.send_new_pushed_stream, StreamState.RESERVED_LOCAL), (StreamState.IDLE, StreamInputs.RECV_PUSH_PROMISE): (H2StreamStateMachine.recv_new_pushed_stream, StreamState.RESERVED_REMOTE), (StreamState.IDLE, StreamInputs.RECV_ALTERNATIVE_SERVICE): (None, StreamState.IDLE), (StreamState.IDLE, StreamInputs.UPGRADE_CLIENT): (H2StreamStateMachine.request_sent, StreamState.HALF_CLOSED_LOCAL), (StreamState.IDLE, StreamInputs.UPGRADE_SERVER): (H2StreamStateMachine.request_received, StreamState.HALF_CLOSED_REMOTE), # State: reserved local (StreamState.RESERVED_LOCAL, StreamInputs.SEND_HEADERS): (H2StreamStateMachine.response_sent, StreamState.HALF_CLOSED_REMOTE), (StreamState.RESERVED_LOCAL, StreamInputs.RECV_DATA): (H2StreamStateMachine.reset_stream_on_error, StreamState.CLOSED), (StreamState.RESERVED_LOCAL, StreamInputs.SEND_WINDOW_UPDATE): (None, StreamState.RESERVED_LOCAL), (StreamState.RESERVED_LOCAL, StreamInputs.RECV_WINDOW_UPDATE): (H2StreamStateMachine.window_updated, StreamState.RESERVED_LOCAL), (StreamState.RESERVED_LOCAL, StreamInputs.SEND_RST_STREAM): (H2StreamStateMachine.send_reset_stream, StreamState.CLOSED), (StreamState.RESERVED_LOCAL, StreamInputs.RECV_RST_STREAM): (H2StreamStateMachine.stream_reset, StreamState.CLOSED), (StreamState.RESERVED_LOCAL, StreamInputs.SEND_ALTERNATIVE_SERVICE): (H2StreamStateMachine.send_alt_svc, StreamState.RESERVED_LOCAL), (StreamState.RESERVED_LOCAL, StreamInputs.RECV_ALTERNATIVE_SERVICE): (None, StreamState.RESERVED_LOCAL), # State: reserved remote (StreamState.RESERVED_REMOTE, StreamInputs.RECV_HEADERS): (H2StreamStateMachine.response_received, StreamState.HALF_CLOSED_LOCAL), (StreamState.RESERVED_REMOTE, StreamInputs.RECV_DATA): (H2StreamStateMachine.reset_stream_on_error, StreamState.CLOSED), (StreamState.RESERVED_REMOTE, StreamInputs.SEND_WINDOW_UPDATE): (None, StreamState.RESERVED_REMOTE), (StreamState.RESERVED_REMOTE, StreamInputs.RECV_WINDOW_UPDATE): (H2StreamStateMachine.window_updated, StreamState.RESERVED_REMOTE), (StreamState.RESERVED_REMOTE, StreamInputs.SEND_RST_STREAM): (H2StreamStateMachine.send_reset_stream, StreamState.CLOSED), (StreamState.RESERVED_REMOTE, StreamInputs.RECV_RST_STREAM): (H2StreamStateMachine.stream_reset, StreamState.CLOSED), (StreamState.RESERVED_REMOTE, StreamInputs.RECV_ALTERNATIVE_SERVICE): (H2StreamStateMachine.recv_alt_svc, StreamState.RESERVED_REMOTE), # State: open (StreamState.OPEN, StreamInputs.SEND_HEADERS): (H2StreamStateMachine.response_sent, StreamState.OPEN), (StreamState.OPEN, StreamInputs.RECV_HEADERS): (H2StreamStateMachine.response_received, StreamState.OPEN), (StreamState.OPEN, StreamInputs.SEND_DATA): (None, StreamState.OPEN), (StreamState.OPEN, StreamInputs.RECV_DATA): (H2StreamStateMachine.data_received, StreamState.OPEN), (StreamState.OPEN, StreamInputs.SEND_END_STREAM): (None, StreamState.HALF_CLOSED_LOCAL), (StreamState.OPEN, StreamInputs.RECV_END_STREAM): (H2StreamStateMachine.stream_half_closed, StreamState.HALF_CLOSED_REMOTE), (StreamState.OPEN, StreamInputs.SEND_WINDOW_UPDATE): (None, StreamState.OPEN), (StreamState.OPEN, StreamInputs.RECV_WINDOW_UPDATE): (H2StreamStateMachine.window_updated, StreamState.OPEN), (StreamState.OPEN, StreamInputs.SEND_RST_STREAM): (H2StreamStateMachine.send_reset_stream, StreamState.CLOSED), (StreamState.OPEN, StreamInputs.RECV_RST_STREAM): (H2StreamStateMachine.stream_reset, StreamState.CLOSED), (StreamState.OPEN, StreamInputs.SEND_PUSH_PROMISE): (H2StreamStateMachine.send_push_promise, StreamState.OPEN), (StreamState.OPEN, StreamInputs.RECV_PUSH_PROMISE): (H2StreamStateMachine.recv_push_promise, StreamState.OPEN), (StreamState.OPEN, StreamInputs.SEND_INFORMATIONAL_HEADERS): (H2StreamStateMachine.send_informational_response, StreamState.OPEN), (StreamState.OPEN, StreamInputs.RECV_INFORMATIONAL_HEADERS): (H2StreamStateMachine.recv_informational_response, StreamState.OPEN), (StreamState.OPEN, StreamInputs.SEND_ALTERNATIVE_SERVICE): (H2StreamStateMachine.send_alt_svc, StreamState.OPEN), (StreamState.OPEN, StreamInputs.RECV_ALTERNATIVE_SERVICE): (H2StreamStateMachine.recv_alt_svc, StreamState.OPEN), # State: half-closed remote (StreamState.HALF_CLOSED_REMOTE, StreamInputs.SEND_HEADERS): (H2StreamStateMachine.response_sent, StreamState.HALF_CLOSED_REMOTE), (StreamState.HALF_CLOSED_REMOTE, StreamInputs.RECV_HEADERS): (H2StreamStateMachine.reset_stream_on_error, StreamState.CLOSED), (StreamState.HALF_CLOSED_REMOTE, StreamInputs.SEND_DATA): (None, StreamState.HALF_CLOSED_REMOTE), (StreamState.HALF_CLOSED_REMOTE, StreamInputs.RECV_DATA): (H2StreamStateMachine.reset_stream_on_error, StreamState.CLOSED), (StreamState.HALF_CLOSED_REMOTE, StreamInputs.SEND_END_STREAM): (H2StreamStateMachine.send_end_stream, StreamState.CLOSED), (StreamState.HALF_CLOSED_REMOTE, StreamInputs.SEND_WINDOW_UPDATE): (None, StreamState.HALF_CLOSED_REMOTE), (StreamState.HALF_CLOSED_REMOTE, StreamInputs.RECV_WINDOW_UPDATE): (H2StreamStateMachine.window_updated, StreamState.HALF_CLOSED_REMOTE), (StreamState.HALF_CLOSED_REMOTE, StreamInputs.SEND_RST_STREAM): (H2StreamStateMachine.send_reset_stream, StreamState.CLOSED), (StreamState.HALF_CLOSED_REMOTE, StreamInputs.RECV_RST_STREAM): (H2StreamStateMachine.stream_reset, StreamState.CLOSED), (StreamState.HALF_CLOSED_REMOTE, StreamInputs.SEND_PUSH_PROMISE): (H2StreamStateMachine.send_push_promise, StreamState.HALF_CLOSED_REMOTE), (StreamState.HALF_CLOSED_REMOTE, StreamInputs.RECV_PUSH_PROMISE): (H2StreamStateMachine.reset_stream_on_error, StreamState.CLOSED), (StreamState.HALF_CLOSED_REMOTE, StreamInputs.SEND_INFORMATIONAL_HEADERS): (H2StreamStateMachine.send_informational_response, StreamState.HALF_CLOSED_REMOTE), (StreamState.HALF_CLOSED_REMOTE, StreamInputs.SEND_ALTERNATIVE_SERVICE): (H2StreamStateMachine.send_alt_svc, StreamState.HALF_CLOSED_REMOTE), (StreamState.HALF_CLOSED_REMOTE, StreamInputs.RECV_ALTERNATIVE_SERVICE): (H2StreamStateMachine.recv_alt_svc, StreamState.HALF_CLOSED_REMOTE), # State: half-closed local (StreamState.HALF_CLOSED_LOCAL, StreamInputs.RECV_HEADERS): (H2StreamStateMachine.response_received, StreamState.HALF_CLOSED_LOCAL), (StreamState.HALF_CLOSED_LOCAL, StreamInputs.RECV_DATA): (H2StreamStateMachine.data_received, StreamState.HALF_CLOSED_LOCAL), (StreamState.HALF_CLOSED_LOCAL, StreamInputs.RECV_END_STREAM): (H2StreamStateMachine.stream_ended, StreamState.CLOSED), (StreamState.HALF_CLOSED_LOCAL, StreamInputs.SEND_WINDOW_UPDATE): (None, StreamState.HALF_CLOSED_LOCAL), (StreamState.HALF_CLOSED_LOCAL, StreamInputs.RECV_WINDOW_UPDATE): (H2StreamStateMachine.window_updated, StreamState.HALF_CLOSED_LOCAL), (StreamState.HALF_CLOSED_LOCAL, StreamInputs.SEND_RST_STREAM): (H2StreamStateMachine.send_reset_stream, StreamState.CLOSED), (StreamState.HALF_CLOSED_LOCAL, StreamInputs.RECV_RST_STREAM): (H2StreamStateMachine.stream_reset, StreamState.CLOSED), (StreamState.HALF_CLOSED_LOCAL, StreamInputs.RECV_PUSH_PROMISE): (H2StreamStateMachine.recv_push_promise, StreamState.HALF_CLOSED_LOCAL), (StreamState.HALF_CLOSED_LOCAL, StreamInputs.RECV_INFORMATIONAL_HEADERS): (H2StreamStateMachine.recv_informational_response, StreamState.HALF_CLOSED_LOCAL), (StreamState.HALF_CLOSED_LOCAL, StreamInputs.SEND_ALTERNATIVE_SERVICE): (H2StreamStateMachine.send_alt_svc, StreamState.HALF_CLOSED_LOCAL), (StreamState.HALF_CLOSED_LOCAL, StreamInputs.RECV_ALTERNATIVE_SERVICE): (H2StreamStateMachine.recv_alt_svc, StreamState.HALF_CLOSED_LOCAL), # State: closed (StreamState.CLOSED, StreamInputs.RECV_END_STREAM): (None, StreamState.CLOSED), (StreamState.CLOSED, StreamInputs.RECV_ALTERNATIVE_SERVICE): (None, StreamState.CLOSED), # RFC 7540 Section 5.1 defines how the end point should react when # receiving a frame on a closed stream with the following statements: # # > An endpoint that receives any frame other than PRIORITY after receiving # > a RST_STREAM MUST treat that as a stream error of type STREAM_CLOSED. # > An endpoint that receives any frames after receiving a frame with the # > END_STREAM flag set MUST treat that as a connection error of type # > STREAM_CLOSED. (StreamState.CLOSED, StreamInputs.RECV_HEADERS): (H2StreamStateMachine.recv_on_closed_stream, StreamState.CLOSED), (StreamState.CLOSED, StreamInputs.RECV_DATA): (H2StreamStateMachine.recv_on_closed_stream, StreamState.CLOSED), # > WINDOW_UPDATE or RST_STREAM frames can be received in this state # > for a short period after a DATA or HEADERS frame containing a # > END_STREAM flag is sent, as instructed in RFC 7540 Section 5.1. But we # > don't have access to a clock so we just always allow it. (StreamState.CLOSED, StreamInputs.RECV_WINDOW_UPDATE): (None, StreamState.CLOSED), (StreamState.CLOSED, StreamInputs.RECV_RST_STREAM): (None, StreamState.CLOSED), # > A receiver MUST treat the receipt of a PUSH_PROMISE on a stream that is # > neither "open" nor "half-closed (local)" as a connection error of type # > PROTOCOL_ERROR. (StreamState.CLOSED, StreamInputs.RECV_PUSH_PROMISE): (H2StreamStateMachine.recv_push_on_closed_stream, StreamState.CLOSED), # Also, users should be forbidden from sending on closed streams. (StreamState.CLOSED, StreamInputs.SEND_HEADERS): (H2StreamStateMachine.send_on_closed_stream, StreamState.CLOSED), (StreamState.CLOSED, StreamInputs.SEND_PUSH_PROMISE): (H2StreamStateMachine.send_push_on_closed_stream, StreamState.CLOSED), (StreamState.CLOSED, StreamInputs.SEND_RST_STREAM): (H2StreamStateMachine.send_on_closed_stream, StreamState.CLOSED), (StreamState.CLOSED, StreamInputs.SEND_DATA): (H2StreamStateMachine.send_on_closed_stream, StreamState.CLOSED), (StreamState.CLOSED, StreamInputs.SEND_WINDOW_UPDATE): (H2StreamStateMachine.send_on_closed_stream, StreamState.CLOSED), (StreamState.CLOSED, StreamInputs.SEND_END_STREAM): (H2StreamStateMachine.send_on_closed_stream, StreamState.CLOSED), } class H2Stream: """ A low-level HTTP/2 stream object. This handles building and receiving frames and maintains per-stream state. This wraps a HTTP/2 Stream state machine implementation, ensuring that frames can only be sent/received when the stream is in a valid state. Attempts to create frames that cannot be sent will raise a ``ProtocolError``. """ def __init__(self, stream_id: int, config: H2Configuration, inbound_window_size: int, outbound_window_size: int) -> None: self.state_machine = H2StreamStateMachine(stream_id) self.stream_id = stream_id self.max_outbound_frame_size: int | None = None self.request_method: bytes | None = None # The current value of the outbound stream flow control window self.outbound_flow_control_window = outbound_window_size # The flow control manager. self._inbound_window_manager = WindowManager(inbound_window_size) # The expected content length, if any. self._expected_content_length: int | None = None # The actual received content length. Always tracked. self._actual_content_length = 0 # The authority we believe this stream belongs to. self._authority: bytes | None = None # The configuration for this stream. self.config = config def __repr__(self) -> str: return f"<{type(self).__name__} id:{self.stream_id} state:{self.state_machine.state!r}>" @property def inbound_flow_control_window(self) -> int: """ The size of the inbound flow control window for the stream. This is rarely publicly useful: instead, use :meth:`remote_flow_control_window `. This shortcut is largely present to provide a shortcut to this data. """ return self._inbound_window_manager.current_window_size @property def open(self) -> bool: """ Whether the stream is 'open' in any sense: that is, whether it counts against the number of concurrent streams. """ # RFC 7540 Section 5.1.2 defines 'open' for this purpose to mean either # the OPEN state or either of the HALF_CLOSED states. Perplexingly, # this excludes the reserved states. # For more detail on why we're doing this in this slightly weird way, # see the comment on ``STREAM_OPEN`` at the top of the file. return STREAM_OPEN[self.state_machine.state] @property def closed(self) -> bool: """ Whether the stream is closed. """ return self.state_machine.state == StreamState.CLOSED @property def closed_by(self) -> StreamClosedBy | None: """ Returns how the stream was closed, as one of StreamClosedBy. """ return self.state_machine.stream_closed_by def upgrade(self, client_side: bool) -> None: """ Called by the connection to indicate that this stream is the initial request/response of an upgraded connection. Places the stream into an appropriate state. """ self.config.logger.debug("Upgrading %r", self) assert self.stream_id == 1 input_ = ( StreamInputs.UPGRADE_CLIENT if client_side else StreamInputs.UPGRADE_SERVER ) # This may return events, we deliberately don't want them. self.state_machine.process_input(input_) def send_headers(self, headers: Iterable[HeaderWeaklyTyped], encoder: Encoder, end_stream: bool = False) -> list[HeadersFrame | ContinuationFrame | PushPromiseFrame]: """ Returns a list of HEADERS/CONTINUATION frames to emit as either headers or trailers. """ self.config.logger.debug("Send headers %s on %r", headers, self) # Because encoding headers makes an irreversible change to the header # compression context, we make the state transition before we encode # them. # First, check if we're a client. If we are, no problem: if we aren't, # we need to scan the header block to see if this is an informational # response. input_ = StreamInputs.SEND_HEADERS bytes_headers = utf8_encode_headers(headers) if ((not self.state_machine.client) and is_informational_response(bytes_headers)): if end_stream: msg = "Cannot set END_STREAM on informational responses." raise ProtocolError(msg) input_ = StreamInputs.SEND_INFORMATIONAL_HEADERS events = self.state_machine.process_input(input_) hf = HeadersFrame(self.stream_id) hdr_validation_flags = self._build_hdr_validation_flags(events) frames = self._build_headers_frames( bytes_headers, encoder, hf, hdr_validation_flags, ) if end_stream: # Not a bug: the END_STREAM flag is valid on the initial HEADERS # frame, not the CONTINUATION frames that follow. self.state_machine.process_input(StreamInputs.SEND_END_STREAM) frames[0].flags.add("END_STREAM") if self.state_machine.trailers_sent and not end_stream: msg = "Trailers must have END_STREAM set." raise ProtocolError(msg) if self.state_machine.client and self._authority is None: self._authority = authority_from_headers(bytes_headers) # store request method for _initialize_content_length self.request_method = extract_method_header(bytes_headers) return frames def push_stream_in_band(self, related_stream_id: int, headers: Iterable[HeaderWeaklyTyped], encoder: Encoder) -> list[HeadersFrame | ContinuationFrame | PushPromiseFrame]: """ Returns a list of PUSH_PROMISE/CONTINUATION frames to emit as a pushed stream header. Called on the stream that has the PUSH_PROMISE frame sent on it. """ self.config.logger.debug("Push stream %r", self) # Because encoding headers makes an irreversible change to the header # compression context, we make the state transition *first*. events = self.state_machine.process_input( StreamInputs.SEND_PUSH_PROMISE, ) ppf = PushPromiseFrame(self.stream_id) ppf.promised_stream_id = related_stream_id hdr_validation_flags = self._build_hdr_validation_flags(events) bytes_headers = utf8_encode_headers(headers) return self._build_headers_frames( bytes_headers, encoder, ppf, hdr_validation_flags, ) def locally_pushed(self) -> list[Frame]: """ Mark this stream as one that was pushed by this peer. Must be called immediately after initialization. Sends no frames, simply updates the state machine. """ # This does not trigger any events. events = self.state_machine.process_input( StreamInputs.SEND_PUSH_PROMISE, ) assert not events return [] def send_data(self, data: bytes | memoryview, end_stream: bool = False, pad_length: int | None = None) -> list[Frame]: """ Prepare some data frames. Optionally end the stream. .. warning:: Does not perform flow control checks. """ self.config.logger.debug( "Send data on %r with end stream set to %s", self, end_stream, ) self.state_machine.process_input(StreamInputs.SEND_DATA) df = DataFrame(self.stream_id) df.data = data if end_stream: self.state_machine.process_input(StreamInputs.SEND_END_STREAM) df.flags.add("END_STREAM") if pad_length is not None: df.flags.add("PADDED") df.pad_length = pad_length # Subtract flow_controlled_length to account for possible padding self.outbound_flow_control_window -= df.flow_controlled_length assert self.outbound_flow_control_window >= 0 return [df] def end_stream(self) -> list[Frame]: """ End a stream without sending data. """ self.config.logger.debug("End stream %r", self) self.state_machine.process_input(StreamInputs.SEND_END_STREAM) df = DataFrame(self.stream_id) df.flags.add("END_STREAM") return [df] def advertise_alternative_service(self, field_value: bytes) -> list[Frame]: """ Advertise an RFC 7838 alternative service. The semantics of this are better documented in the ``H2Connection`` class. """ self.config.logger.debug( "Advertise alternative service of %r for %r", field_value, self, ) self.state_machine.process_input(StreamInputs.SEND_ALTERNATIVE_SERVICE) asf = AltSvcFrame(self.stream_id) asf.field = field_value return [asf] def increase_flow_control_window(self, increment: int) -> list[Frame]: """ Increase the size of the flow control window for the remote side. """ self.config.logger.debug( "Increase flow control window for %r by %d", self, increment, ) self.state_machine.process_input(StreamInputs.SEND_WINDOW_UPDATE) self._inbound_window_manager.window_opened(increment) wuf = WindowUpdateFrame(self.stream_id) wuf.window_increment = increment return [wuf] def receive_push_promise_in_band(self, promised_stream_id: int, headers: Iterable[Header], header_encoding: bool | str | None) -> tuple[list[Frame], list[Event]]: """ Receives a push promise frame sent on this stream, pushing a remote stream. This is called on the stream that has the PUSH_PROMISE sent on it. """ self.config.logger.debug( "Receive Push Promise on %r for remote stream %d", self, promised_stream_id, ) events = self.state_machine.process_input( StreamInputs.RECV_PUSH_PROMISE, ) events[0].pushed_stream_id = promised_stream_id hdr_validation_flags = self._build_hdr_validation_flags(events) events[0].headers = self._process_received_headers( headers, hdr_validation_flags, header_encoding, ) return [], events def remotely_pushed(self, pushed_headers: Iterable[Header]) -> tuple[list[Frame], list[Event]]: """ Mark this stream as one that was pushed by the remote peer. Must be called immediately after initialization. Sends no frames, simply updates the state machine. """ self.config.logger.debug("%r pushed by remote peer", self) events = self.state_machine.process_input( StreamInputs.RECV_PUSH_PROMISE, ) self._authority = authority_from_headers(pushed_headers) return [], events def receive_headers(self, headers: Iterable[Header], end_stream: bool, header_encoding: bool | str | None) -> tuple[list[Frame], list[Event]]: """ Receive a set of headers (or trailers). """ if is_informational_response(headers): if end_stream: msg = "Cannot set END_STREAM on informational responses" raise ProtocolError(msg) input_ = StreamInputs.RECV_INFORMATIONAL_HEADERS else: input_ = StreamInputs.RECV_HEADERS events = self.state_machine.process_input(input_) if end_stream: es_events = self.state_machine.process_input( StreamInputs.RECV_END_STREAM, ) events[0].stream_ended = es_events[0] events += es_events self._initialize_content_length(headers) if isinstance(events[0], TrailersReceived) and not end_stream: msg = "Trailers must have END_STREAM set" raise ProtocolError(msg) hdr_validation_flags = self._build_hdr_validation_flags(events) events[0].headers = self._process_received_headers( headers, hdr_validation_flags, header_encoding, ) return [], events def receive_data(self, data: bytes, end_stream: bool, flow_control_len: int) -> tuple[list[Frame], list[Event]]: """ Receive some data. """ self.config.logger.debug( "Receive data on %r with end stream %s and flow control length " "set to %d", self, end_stream, flow_control_len, ) events = self.state_machine.process_input(StreamInputs.RECV_DATA) self._inbound_window_manager.window_consumed(flow_control_len) self._track_content_length(len(data), end_stream) if end_stream: es_events = self.state_machine.process_input( StreamInputs.RECV_END_STREAM, ) events[0].stream_ended = es_events[0] events.extend(es_events) events[0].data = data events[0].flow_controlled_length = flow_control_len return [], events def receive_window_update(self, increment: int) -> tuple[list[Frame], list[Event]]: """ Handle a WINDOW_UPDATE increment. """ self.config.logger.debug( "Receive Window Update on %r for increment of %d", self, increment, ) events = self.state_machine.process_input( StreamInputs.RECV_WINDOW_UPDATE, ) frames = [] # If we encounter a problem with incrementing the flow control window, # this should be treated as a *stream* error, not a *connection* error. # That means we need to catch the error and forcibly close the stream. if events: events[0].delta = increment try: self.outbound_flow_control_window = guard_increment_window( self.outbound_flow_control_window, increment, ) except FlowControlError: # Ok, this is bad. We're going to need to perform a local # reset. event = StreamReset() event.stream_id = self.stream_id event.error_code = ErrorCodes.FLOW_CONTROL_ERROR event.remote_reset = False events = [event] frames = self.reset_stream(event.error_code) return frames, events def receive_continuation(self) -> None: """ A naked CONTINUATION frame has been received. This is always an error, but the type of error it is depends on the state of the stream and must transition the state of the stream, so we need to handle it. """ self.config.logger.debug("Receive Continuation frame on %r", self) self.state_machine.process_input( StreamInputs.RECV_CONTINUATION, ) msg = "Should not be reachable" # pragma: no cover raise AssertionError(msg) # pragma: no cover def receive_alt_svc(self, frame: AltSvcFrame) -> tuple[list[Frame], list[Event]]: """ An Alternative Service frame was received on the stream. This frame inherits the origin associated with this stream. """ self.config.logger.debug( "Receive Alternative Service frame on stream %r", self, ) # If the origin is present, RFC 7838 says we have to ignore it. if frame.origin: return [], [] events = self.state_machine.process_input( StreamInputs.RECV_ALTERNATIVE_SERVICE, ) # There are lots of situations where we want to ignore the ALTSVC # frame. If we need to pay attention, we'll have an event and should # fill it out. if events: assert isinstance(events[0], AlternativeServiceAvailable) events[0].origin = self._authority events[0].field_value = frame.field return [], events def reset_stream(self, error_code: ErrorCodes | int = 0) -> list[Frame]: """ Close the stream locally. Reset the stream with an error code. """ self.config.logger.debug( "Local reset %r with error code: %d", self, error_code, ) self.state_machine.process_input(StreamInputs.SEND_RST_STREAM) rsf = RstStreamFrame(self.stream_id) rsf.error_code = error_code return [rsf] def stream_reset(self, frame: RstStreamFrame) -> tuple[list[Frame], list[Event]]: """ Handle a stream being reset remotely. """ self.config.logger.debug( "Remote reset %r with error code: %d", self, frame.error_code, ) events = self.state_machine.process_input(StreamInputs.RECV_RST_STREAM) if events: # We don't fire an event if this stream is already closed. events[0].error_code = _error_code_from_int(frame.error_code) return [], events def acknowledge_received_data(self, acknowledged_size: int) -> list[Frame]: """ The user has informed us that they've processed some amount of data that was received on this stream. Pass that to the window manager and potentially return some WindowUpdate frames. """ self.config.logger.debug( "Acknowledge received data with size %d on %r", acknowledged_size, self, ) increment = self._inbound_window_manager.process_bytes( acknowledged_size, ) if increment: f = WindowUpdateFrame(self.stream_id) f.window_increment = increment return [f] return [] def _build_hdr_validation_flags(self, events: Any) -> HeaderValidationFlags: """ Constructs a set of header validation flags for use when normalizing and validating header blocks. """ is_trailer = isinstance( events[0], (_TrailersSent, TrailersReceived), ) is_response_header = isinstance( events[0], ( _ResponseSent, ResponseReceived, InformationalResponseReceived, ), ) is_push_promise = isinstance( events[0], (PushedStreamReceived, _PushedRequestSent), ) return HeaderValidationFlags( is_client=self.state_machine.client or False, is_trailer=is_trailer, is_response_header=is_response_header, is_push_promise=is_push_promise, ) def _build_headers_frames(self, headers: Iterable[Header], encoder: Encoder, first_frame: HeadersFrame | PushPromiseFrame, hdr_validation_flags: HeaderValidationFlags) \ -> list[HeadersFrame | ContinuationFrame | PushPromiseFrame]: """ Helper method to build headers or push promise frames. """ # We need to lowercase the header names, and to ensure that secure # header fields are kept out of compression contexts. if self.config.normalize_outbound_headers: # also we may want to split outbound cookies to improve # headers compression should_split_outbound_cookies = self.config.split_outbound_cookies headers = normalize_outbound_headers( headers, hdr_validation_flags, should_split_outbound_cookies, ) if self.config.validate_outbound_headers: headers = validate_outbound_headers( headers, hdr_validation_flags, ) encoded_headers = encoder.encode(headers) # Slice into blocks of max_outbound_frame_size. Be careful with this: # it only works right because we never send padded frames or priority # information on the frames. Revisit this if we do. header_blocks = [ encoded_headers[i:i+(self.max_outbound_frame_size or 0)] for i in range( 0, len(encoded_headers), (self.max_outbound_frame_size or 0), ) ] frames: list[HeadersFrame | ContinuationFrame | PushPromiseFrame] = [] first_frame.data = header_blocks[0] frames.append(first_frame) for block in header_blocks[1:]: cf = ContinuationFrame(self.stream_id) cf.data = block frames.append(cf) frames[-1].flags.add("END_HEADERS") return frames def _process_received_headers(self, headers: Iterable[Header], header_validation_flags: HeaderValidationFlags, header_encoding: bool | str | None) -> Iterable[Header]: """ When headers have been received from the remote peer, run a processing pipeline on them to transform them into the appropriate form for attaching to an event. """ if self.config.normalize_inbound_headers: headers = normalize_inbound_headers( headers, header_validation_flags, ) if self.config.validate_inbound_headers: headers = validate_headers(headers, header_validation_flags) if isinstance(header_encoding, str): headers = _decode_headers(headers, header_encoding) # The above steps are all generators, so we need to concretize the # headers now. return list(headers) def _initialize_content_length(self, headers: Iterable[Header]) -> None: """ Checks the headers for a content-length header and initializes the _expected_content_length field from it. It's not an error for no Content-Length header to be present. """ if self.request_method == b"HEAD": self._expected_content_length = 0 return for n, v in headers: if n == b"content-length": try: self._expected_content_length = int(v, 10) except ValueError as err: msg = f"Invalid content-length header: {v!r}" raise ProtocolError(msg) from err return def _track_content_length(self, length: int, end_stream: bool) -> None: """ Update the expected content length in response to data being received. Validates that the appropriate amount of data is sent. Always updates the received data, but only validates the length against the content-length header if one was sent. :param length: The length of the body chunk received. :param end_stream: If this is the last body chunk received. """ self._actual_content_length += length actual = self._actual_content_length expected = self._expected_content_length if expected is not None: if expected < actual: raise InvalidBodyLengthError(expected, actual) if end_stream and expected != actual: raise InvalidBodyLengthError(expected, actual) def _inbound_flow_control_change_from_settings(self, delta: int) -> None: """ We changed SETTINGS_INITIAL_WINDOW_SIZE, which means we need to update the target window size for flow control. For our flow control strategy, this means we need to do two things: we need to adjust the current window size, but we also need to set the target maximum window size to the new value. """ new_max_size = self._inbound_window_manager.max_window_size + delta self._inbound_window_manager.window_opened(delta) self._inbound_window_manager.max_window_size = new_max_size def _decode_headers(headers: Iterable[HeaderWeaklyTyped], encoding: str) -> Generator[HeaderTuple, None, None]: """ Given an iterable of header two-tuples and an encoding, decodes those headers using that encoding while preserving the type of the header tuple. This ensures that the use of ``HeaderTuple`` is preserved. """ for header in headers: # This function expects to work on decoded headers, which are always # HeaderTuple objects. assert isinstance(header, HeaderTuple) name, value = header assert isinstance(name, bytes) assert isinstance(value, bytes) n = name.decode(encoding) v = value.decode(encoding) yield header.__class__(n, v) ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/src/h2/utilities.py0000644000076500000240000006260414744265074015101 0ustar00kriechistaff""" h2/utilities ~~~~~~~~~~~~ Utility functions that do not belong in a separate module. """ from __future__ import annotations import collections import re from string import whitespace from typing import TYPE_CHECKING, Any, NamedTuple from hpack.struct import HeaderTuple, NeverIndexedHeaderTuple from .exceptions import FlowControlError, ProtocolError if TYPE_CHECKING: # pragma: no cover from collections.abc import Generator, Iterable from hpack.struct import Header, HeaderWeaklyTyped UPPER_RE = re.compile(b"[A-Z]") SIGIL = ord(b":") INFORMATIONAL_START = ord(b"1") # A set of headers that are hop-by-hop or connection-specific and thus # forbidden in HTTP/2. This list comes from RFC 7540 § 8.1.2.2. CONNECTION_HEADERS = frozenset([ b"connection", b"proxy-connection", b"keep-alive", b"transfer-encoding", b"upgrade", ]) _ALLOWED_PSEUDO_HEADER_FIELDS = frozenset([ b":method", b":scheme", b":authority", b":path", b":status", b":protocol", ]) _SECURE_HEADERS = frozenset([ # May have basic credentials which are vulnerable to dictionary attacks. b"authorization", b"proxy-authorization", ]) _REQUEST_ONLY_HEADERS = frozenset([ b":scheme", b":path", b":authority", b":method", b":protocol", ]) _RESPONSE_ONLY_HEADERS = frozenset([b":status"]) # A Set of pseudo headers that are only valid if the method is # CONNECT, see RFC 8441 § 5 _CONNECT_REQUEST_ONLY_HEADERS = frozenset([b":protocol"]) _WHITESPACE = frozenset(map(ord, whitespace)) def _secure_headers(headers: Iterable[Header], hdr_validation_flags: HeaderValidationFlags | None) -> Generator[Header, None, None]: """ Certain headers are at risk of being attacked during the header compression phase, and so need to be kept out of header compression contexts. This function automatically transforms certain specific headers into HPACK never-indexed fields to ensure they don't get added to header compression contexts. This function currently implements two rules: - 'authorization' and 'proxy-authorization' fields are automatically made never-indexed. - Any 'cookie' header field shorter than 20 bytes long is made never-indexed. These fields are the most at-risk. These rules are inspired by Firefox and nghttp2. """ for header in headers: assert isinstance(header[0], bytes) if header[0] in _SECURE_HEADERS or (header[0] in b"cookie" and len(header[1]) < 20): yield NeverIndexedHeaderTuple(header[0], header[1]) else: yield header def extract_method_header(headers: Iterable[Header]) -> bytes | None: """ Extracts the request method from the headers list. """ for k, v in headers: if isinstance(v, bytes) and k == b":method": return v if isinstance(v, str) and k == ":method": return v.encode("utf-8") # pragma: no cover return None def is_informational_response(headers: Iterable[Header]) -> bool: """ Searches headers list for a :status header to confirm that a given collection of headers are an informational response. Assumes the header are well formed and encoded as bytes: that is, that the HTTP/2 special headers are first in the block, and so that it can stop looking when it finds the first header field whose name does not begin with a colon. :param headers: The HTTP/2 headers. :returns: A boolean indicating if this is an informational response. """ for n, v in headers: if not n.startswith(b":"): return False if n != b":status": # If we find a non-special header, we're done here: stop looping. continue # If the first digit is a 1, we've got informational headers. return v.startswith(b"1") return False def guard_increment_window(current: int, increment: int) -> int: """ Increments a flow control window, guarding against that window becoming too large. :param current: The current value of the flow control window. :param increment: The increment to apply to that window. :returns: The new value of the window. :raises: ``FlowControlError`` """ # The largest value the flow control window may take. LARGEST_FLOW_CONTROL_WINDOW = 2**31 - 1 # noqa: N806 new_size = current + increment if new_size > LARGEST_FLOW_CONTROL_WINDOW: msg = f"May not increment flow control window past {LARGEST_FLOW_CONTROL_WINDOW}" raise FlowControlError(msg) return new_size def authority_from_headers(headers: Iterable[Header]) -> bytes | None: """ Given a header set, searches for the authority header and returns the value. Note that this doesn't use indexing, so should only be called if the headers are for a client request. Otherwise, will loop over the entire header set, which is potentially unwise. :param headers: The HTTP header set. :returns: The value of the authority header, or ``None``. :rtype: ``bytes`` or ``None``. """ for n, v in headers: if n == b":authority": return v return None # Flags used by the validate_headers pipeline to determine which checks # should be applied to a given set of headers. class HeaderValidationFlags(NamedTuple): is_client: bool is_trailer: bool is_response_header: bool is_push_promise: bool def validate_headers(headers: Iterable[Header], hdr_validation_flags: HeaderValidationFlags) -> Iterable[Header]: """ Validates a header sequence against a set of constraints from RFC 7540. :param headers: The HTTP header set. :param hdr_validation_flags: An instance of HeaderValidationFlags. """ # This validation logic is built on a sequence of generators that are # iterated over to provide the final header list. This reduces some of the # overhead of doing this checking. However, it's worth noting that this # checking remains somewhat expensive, and attempts should be made wherever # possible to reduce the time spent doing them. # # For example, we avoid tuple unpacking in loops because it represents a # fixed cost that we don't want to spend, instead indexing into the header # tuples. headers = _reject_empty_header_names( headers, hdr_validation_flags, ) headers = _reject_uppercase_header_fields( headers, hdr_validation_flags, ) headers = _reject_surrounding_whitespace( headers, hdr_validation_flags, ) headers = _reject_te( headers, hdr_validation_flags, ) headers = _reject_connection_header( headers, hdr_validation_flags, ) headers = _reject_pseudo_header_fields( headers, hdr_validation_flags, ) headers = _check_host_authority_header( headers, hdr_validation_flags, ) return _check_path_header(headers, hdr_validation_flags) def _reject_empty_header_names(headers: Iterable[Header], hdr_validation_flags: HeaderValidationFlags) -> Generator[Header, None, None]: """ Raises a ProtocolError if any header names are empty (length 0). While hpack decodes such headers without errors, they are semantically forbidden in HTTP, see RFC 7230, stating that they must be at least one character long. """ for header in headers: if len(header[0]) == 0: msg = "Received header name with zero length." raise ProtocolError(msg) yield header def _reject_uppercase_header_fields(headers: Iterable[Header], hdr_validation_flags: HeaderValidationFlags) -> Generator[Header, None, None]: """ Raises a ProtocolError if any uppercase character is found in a header block. """ for header in headers: if UPPER_RE.search(header[0]): msg = f"Received uppercase header name {header[0]!r}." raise ProtocolError(msg) yield header def _reject_surrounding_whitespace(headers: Iterable[Header], hdr_validation_flags: HeaderValidationFlags) -> Generator[Header, None, None]: """ Raises a ProtocolError if any header name or value is surrounded by whitespace characters. """ # For compatibility with RFC 7230 header fields, we need to allow the field # value to be an empty string. This is ludicrous, but technically allowed. # The field name may not be empty, though, so we can safely assume that it # must have at least one character in it and throw exceptions if it # doesn't. for header in headers: if header[0][0] in _WHITESPACE or header[0][-1] in _WHITESPACE: msg = f"Received header name surrounded by whitespace {header[0]!r}" raise ProtocolError(msg) if header[1] and ((header[1][0] in _WHITESPACE) or (header[1][-1] in _WHITESPACE)): msg = f"Received header value surrounded by whitespace {header[1]!r}" raise ProtocolError(msg) yield header def _reject_te(headers: Iterable[Header], hdr_validation_flags: HeaderValidationFlags) -> Generator[Header, None, None]: """ Raises a ProtocolError if the TE header is present in a header block and its value is anything other than "trailers". """ for header in headers: if header[0] == b"te" and header[1].lower() != b"trailers": msg = f"Invalid value for TE header: {header[1]!r}" raise ProtocolError(msg) yield header def _reject_connection_header(headers: Iterable[Header], hdr_validation_flags: HeaderValidationFlags) -> Generator[Header, None, None]: """ Raises a ProtocolError if the Connection header is present in a header block. """ for header in headers: if header[0] in CONNECTION_HEADERS: msg = f"Connection-specific header field present: {header[0]!r}." raise ProtocolError(msg) yield header def _assert_header_in_set(bytes_header: bytes, header_set: set[bytes | str] | set[bytes] | set[str]) -> None: """ Given a set of header names, checks whether the string or byte version of the header name is present. Raises a Protocol error with the appropriate error if it's missing. """ if bytes_header not in header_set: msg = f"Header block missing mandatory {bytes_header!r} header" raise ProtocolError(msg) def _reject_pseudo_header_fields(headers: Iterable[Header], hdr_validation_flags: HeaderValidationFlags) -> Generator[Header, None, None]: """ Raises a ProtocolError if duplicate pseudo-header fields are found in a header block or if a pseudo-header field appears in a block after an ordinary header field. Raises a ProtocolError if pseudo-header fields are found in trailers. """ seen_pseudo_header_fields = set() seen_regular_header = False method = None for header in headers: if header[0][0] == SIGIL: if header[0] in seen_pseudo_header_fields: msg = f"Received duplicate pseudo-header field {header[0]!r}" raise ProtocolError(msg) seen_pseudo_header_fields.add(header[0]) if seen_regular_header: msg = f"Received pseudo-header field out of sequence: {header[0]!r}" raise ProtocolError(msg) if header[0] not in _ALLOWED_PSEUDO_HEADER_FIELDS: msg = f"Received custom pseudo-header field {header[0]!r}" raise ProtocolError(msg) if header[0] in b":method": method = header[1] else: seen_regular_header = True yield header # Check the pseudo-headers we got to confirm they're acceptable. _check_pseudo_header_field_acceptability( seen_pseudo_header_fields, method, hdr_validation_flags, ) def _check_pseudo_header_field_acceptability(pseudo_headers: set[bytes | str] | set[bytes] | set[str], method: bytes | None, hdr_validation_flags: HeaderValidationFlags) -> None: """ Given the set of pseudo-headers present in a header block and the validation flags, confirms that RFC 7540 allows them. """ # Pseudo-header fields MUST NOT appear in trailers - RFC 7540 § 8.1.2.1 if hdr_validation_flags.is_trailer and pseudo_headers: msg = f"Received pseudo-header in trailer {pseudo_headers}" raise ProtocolError(msg) # If ':status' pseudo-header is not there in a response header, reject it. # Similarly, if ':path', ':method', or ':scheme' are not there in a request # header, reject it. Additionally, if a response contains any request-only # headers or vice-versa, reject it. # Relevant RFC section: RFC 7540 § 8.1.2.4 # https://tools.ietf.org/html/rfc7540#section-8.1.2.4 if hdr_validation_flags.is_response_header: _assert_header_in_set(b":status", pseudo_headers) invalid_response_headers = pseudo_headers & _REQUEST_ONLY_HEADERS if invalid_response_headers: msg = f"Encountered request-only headers {invalid_response_headers}" raise ProtocolError(msg) elif (not hdr_validation_flags.is_response_header and not hdr_validation_flags.is_trailer): # This is a request, so we need to have seen :path, :method, and # :scheme. _assert_header_in_set(b":path", pseudo_headers) _assert_header_in_set(b":method", pseudo_headers) _assert_header_in_set(b":scheme", pseudo_headers) invalid_request_headers = pseudo_headers & _RESPONSE_ONLY_HEADERS if invalid_request_headers: msg = f"Encountered response-only headers {invalid_request_headers}" raise ProtocolError(msg) if method != b"CONNECT": invalid_headers = pseudo_headers & _CONNECT_REQUEST_ONLY_HEADERS if invalid_headers: msg = f"Encountered connect-request-only headers {invalid_headers!r}" raise ProtocolError(msg) def _validate_host_authority_header(headers: Iterable[Header]) -> Generator[Header, None, None]: """ Given the :authority and Host headers from a request block that isn't a trailer, check that: 1. At least one of these headers is set. 2. If both headers are set, they match. :param headers: The HTTP header set. :raises: ``ProtocolError`` """ # We use None as a sentinel value. Iterate over the list of headers, # and record the value of these headers (if present). We don't need # to worry about receiving duplicate :authority headers, as this is # enforced by the _reject_pseudo_header_fields() pipeline. # # TODO: We should also guard against receiving duplicate Host headers, # and against sending duplicate headers. authority_header_val = None host_header_val = None for header in headers: if header[0] == b":authority": authority_header_val = header[1] elif header[0] == b"host": host_header_val = header[1] yield header # If we have not-None values for these variables, then we know we saw # the corresponding header. authority_present = (authority_header_val is not None) host_present = (host_header_val is not None) # It is an error for a request header block to contain neither # an :authority header nor a Host header. if not authority_present and not host_present: msg = "Request header block does not have an :authority or Host header." raise ProtocolError(msg) # If we receive both headers, they should definitely match. if authority_present and host_present and authority_header_val != host_header_val: msg = ( "Request header block has mismatched :authority and " f"Host headers: {authority_header_val!r} / {host_header_val!r}" ) raise ProtocolError(msg) def _check_host_authority_header(headers: Iterable[Header], hdr_validation_flags: HeaderValidationFlags) -> Generator[Header, None, None]: """ Raises a ProtocolError if a header block arrives that does not contain an :authority or a Host header, or if a header block contains both fields, but their values do not match. """ # We only expect to see :authority and Host headers on request header # blocks that aren't trailers, so skip this validation if this is a # response header or we're looking at trailer blocks. skip_validation = ( hdr_validation_flags.is_response_header or hdr_validation_flags.is_trailer ) if skip_validation: return (h for h in headers) return _validate_host_authority_header(headers) def _check_path_header(headers: Iterable[Header], hdr_validation_flags: HeaderValidationFlags) -> Generator[Header, None, None]: """ Raise a ProtocolError if a header block arrives or is sent that contains an empty :path header. """ def inner() -> Generator[Header, None, None]: for header in headers: if header[0] == b":path" and not header[1]: msg = "An empty :path header is forbidden" raise ProtocolError(msg) yield header # We only expect to see :authority and Host headers on request header # blocks that aren't trailers, so skip this validation if this is a # response header or we're looking at trailer blocks. skip_validation = ( hdr_validation_flags.is_response_header or hdr_validation_flags.is_trailer ) if skip_validation: return (h for h in headers) return inner() def _to_bytes(v: bytes | str) -> bytes: """ Given an assumed `str` (or anything that supports `.encode()`), encodes it using utf-8 into bytes. Returns the unmodified object if it is already a `bytes` object. """ return v if isinstance(v, bytes) else v.encode("utf-8") def utf8_encode_headers(headers: Iterable[HeaderWeaklyTyped]) -> list[Header]: """ Given an iterable of header two-tuples, rebuilds that as a list with the header names and values encoded as utf-8 bytes. This function produces tuples that preserve the original type of the header tuple for tuple and any ``HeaderTuple``. """ encoded_headers: list[Header] = [] for header in headers: h = (_to_bytes(header[0]), _to_bytes(header[1])) if isinstance(header, HeaderTuple): encoded_headers.append(header.__class__(h[0], h[1])) else: encoded_headers.append(h) return encoded_headers def _lowercase_header_names(headers: Iterable[Header], hdr_validation_flags: HeaderValidationFlags | None) -> Generator[Header, None, None]: """ Given an iterable of header two-tuples, rebuilds that iterable with the header names lowercased. This generator produces tuples that preserve the original type of the header tuple for tuple and any ``HeaderTuple``. """ for header in headers: if isinstance(header, HeaderTuple): yield header.__class__(header[0].lower(), header[1]) else: yield (header[0].lower(), header[1]) def _strip_surrounding_whitespace(headers: Iterable[Header], hdr_validation_flags: HeaderValidationFlags | None) -> Generator[Header, None, None]: """ Given an iterable of header two-tuples, strip both leading and trailing whitespace from both header names and header values. This generator produces tuples that preserve the original type of the header tuple for tuple and any ``HeaderTuple``. """ for header in headers: if isinstance(header, HeaderTuple): yield header.__class__(header[0].strip(), header[1].strip()) else: yield (header[0].strip(), header[1].strip()) def _strip_connection_headers(headers: Iterable[Header], hdr_validation_flags: HeaderValidationFlags | None) -> Generator[Header, None, None]: """ Strip any connection headers as per RFC7540 § 8.1.2.2. """ for header in headers: if header[0] not in CONNECTION_HEADERS: yield header def _check_sent_host_authority_header(headers: Iterable[Header], hdr_validation_flags: HeaderValidationFlags) -> Generator[Header, None, None]: """ Raises an InvalidHeaderBlockError if we try to send a header block that does not contain an :authority or a Host header, or if the header block contains both fields, but their values do not match. """ # We only expect to see :authority and Host headers on request header # blocks that aren't trailers, so skip this validation if this is a # response header or we're looking at trailer blocks. skip_validation = ( hdr_validation_flags.is_response_header or hdr_validation_flags.is_trailer ) if skip_validation: return (h for h in headers) return _validate_host_authority_header(headers) def _combine_cookie_fields(headers: Iterable[Header], hdr_validation_flags: HeaderValidationFlags) -> Generator[Header, None, None]: """ RFC 7540 § 8.1.2.5 allows HTTP/2 clients to split the Cookie header field, which must normally appear only once, into multiple fields for better compression. However, they MUST be joined back up again when received. This normalization step applies that transform. The side-effect is that all cookie fields now appear *last* in the header block. """ # There is a problem here about header indexing. Specifically, it's # possible that all these cookies are sent with different header indexing # values. At this point it shouldn't matter too much, so we apply our own # logic and make them never-indexed. cookies: list[bytes] = [] for header in headers: if header[0] == b"cookie": cookies.append(header[1]) else: yield header if cookies: cookie_val = b"; ".join(cookies) yield NeverIndexedHeaderTuple(b"cookie", cookie_val) def _split_outbound_cookie_fields(headers: Iterable[Header], hdr_validation_flags: HeaderValidationFlags | None) -> Generator[Header, None, None]: """ RFC 7540 § 8.1.2.5 allows for better compression efficiency, to split the Cookie header field into separate header fields We want to do it for outbound requests, as we are doing for inbound. """ for header in headers: assert isinstance(header[0], bytes) assert isinstance(header[1], bytes) if header[0] == b"cookie": for cookie_val in header[1].split(b"; "): if isinstance(header, HeaderTuple): yield header.__class__(header[0], cookie_val) else: yield header[0], cookie_val else: yield header def normalize_outbound_headers(headers: Iterable[Header], hdr_validation_flags: HeaderValidationFlags | None, should_split_outbound_cookies: bool=False) -> Generator[Header, None, None]: """ Normalizes a header sequence that we are about to send. :param headers: The HTTP header set. :param hdr_validation_flags: An instance of HeaderValidationFlags. :param should_split_outbound_cookies: boolean flag """ headers = _lowercase_header_names(headers, hdr_validation_flags) if should_split_outbound_cookies: headers = _split_outbound_cookie_fields(headers, hdr_validation_flags) headers = _strip_surrounding_whitespace(headers, hdr_validation_flags) headers = _strip_connection_headers(headers, hdr_validation_flags) return _secure_headers(headers, hdr_validation_flags) def normalize_inbound_headers(headers: Iterable[Header], hdr_validation_flags: HeaderValidationFlags) -> Generator[Header, None, None]: """ Normalizes a header sequence that we have received. :param headers: The HTTP header set. :param hdr_validation_flags: An instance of HeaderValidationFlags """ return _combine_cookie_fields(headers, hdr_validation_flags) def validate_outbound_headers(headers: Iterable[Header], hdr_validation_flags: HeaderValidationFlags) -> Generator[Header, None, None]: """ Validates and normalizes a header sequence that we are about to send. :param headers: The HTTP header set. :param hdr_validation_flags: An instance of HeaderValidationFlags. """ headers = _reject_te( headers, hdr_validation_flags, ) headers = _reject_connection_header( headers, hdr_validation_flags, ) headers = _reject_pseudo_header_fields( headers, hdr_validation_flags, ) headers = _check_sent_host_authority_header( headers, hdr_validation_flags, ) return _check_path_header(headers, hdr_validation_flags) class SizeLimitDict(collections.OrderedDict[int, Any]): def __init__(self, *args: dict[int, int], **kwargs: Any) -> None: self._size_limit = kwargs.pop("size_limit", None) super().__init__(*args, **kwargs) self._check_size_limit() def __setitem__(self, key: int, value: Any | int) -> None: super().__setitem__(key, value) self._check_size_limit() def _check_size_limit(self) -> None: if self._size_limit is not None: while len(self) > self._size_limit: self.popitem(last=False) ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/src/h2/windows.py0000644000076500000240000001256414744265074014560 0ustar00kriechistaff""" h2/windows ~~~~~~~~~~ Defines tools for managing HTTP/2 flow control windows. The objects defined in this module are used to automatically manage HTTP/2 flow control windows. Specifically, they keep track of what the size of the window is, how much data has been consumed from that window, and how much data the user has already used. It then implements a basic algorithm that attempts to manage the flow control window without user input, trying to ensure that it does not emit too many WINDOW_UPDATE frames. """ from __future__ import annotations from .exceptions import FlowControlError # The largest acceptable value for a HTTP/2 flow control window. LARGEST_FLOW_CONTROL_WINDOW = 2**31 - 1 class WindowManager: """ A basic HTTP/2 window manager. :param max_window_size: The maximum size of the flow control window. :type max_window_size: ``int`` """ def __init__(self, max_window_size: int) -> None: assert max_window_size <= LARGEST_FLOW_CONTROL_WINDOW self.max_window_size = max_window_size self.current_window_size = max_window_size self._bytes_processed = 0 def window_consumed(self, size: int) -> None: """ We have received a certain number of bytes from the remote peer. This necessarily shrinks the flow control window! :param size: The number of flow controlled bytes we received from the remote peer. :type size: ``int`` :returns: Nothing. :rtype: ``None`` """ self.current_window_size -= size if self.current_window_size < 0: msg = "Flow control window shrunk below 0" raise FlowControlError(msg) def window_opened(self, size: int) -> None: """ The flow control window has been incremented, either because of manual flow control management or because of the user changing the flow control settings. This can have the effect of increasing what we consider to be the "maximum" flow control window size. This does not increase our view of how many bytes have been processed, only of how much space is in the window. :param size: The increment to the flow control window we received. :type size: ``int`` :returns: Nothing :rtype: ``None`` """ self.current_window_size += size if self.current_window_size > LARGEST_FLOW_CONTROL_WINDOW: msg = f"Flow control window mustn't exceed {LARGEST_FLOW_CONTROL_WINDOW}" raise FlowControlError(msg) self.max_window_size = max(self.current_window_size, self.max_window_size) def process_bytes(self, size: int) -> int | None: """ The application has informed us that it has processed a certain number of bytes. This may cause us to want to emit a window update frame. If we do want to emit a window update frame, this method will return the number of bytes that we should increment the window by. :param size: The number of flow controlled bytes that the application has processed. :type size: ``int`` :returns: The number of bytes to increment the flow control window by, or ``None``. :rtype: ``int`` or ``None`` """ self._bytes_processed += size return self._maybe_update_window() def _maybe_update_window(self) -> int | None: """ Run the algorithm. Our current algorithm can be described like this. 1. If no bytes have been processed, we immediately return 0. There is no meaningful way for us to hand space in the window back to the remote peer, so let's not even try. 2. If there is no space in the flow control window, and we have processed at least 1024 bytes (or 1/4 of the window, if the window is smaller), we will emit a window update frame. This is to avoid the risk of blocking a stream altogether. 3. If there is space in the flow control window, and we have processed at least 1/2 of the window worth of bytes, we will emit a window update frame. This is to minimise the number of window update frames we have to emit. In a healthy system with large flow control windows, this will irregularly emit WINDOW_UPDATE frames. This prevents us starving the connection by emitting eleventy bajillion WINDOW_UPDATE frames, especially in situations where the remote peer is sending a lot of very small DATA frames. """ # TODO: Can the window be smaller than 1024 bytes? If not, we can # streamline this algorithm. if not self._bytes_processed: return None max_increment = (self.max_window_size - self.current_window_size) increment = 0 # Note that, even though we may increment less than _bytes_processed, # we still want to set it to zero whenever we emit an increment. This # is because we'll always increment up to the maximum we can. if ((self.current_window_size == 0) and ( self._bytes_processed > min(1024, self.max_window_size // 4))) or self._bytes_processed >= (self.max_window_size // 2): increment = min(self._bytes_processed, max_increment) self._bytes_processed = 0 self.current_window_size += increment return increment ././@PaxHeader0000000000000000000000000000003400000000000010212 xustar0028 mtime=1738482098.7744427 h2-4.2.0/src/h2.egg-info/0000755000076500000240000000000014747620663014200 5ustar00kriechistaff././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1738482098.0 h2-4.2.0/src/h2.egg-info/PKG-INFO0000644000076500000240000001177414747620662015306 0ustar00kriechistaffMetadata-Version: 2.2 Name: h2 Version: 4.2.0 Summary: Pure-Python HTTP/2 protocol implementation Author-email: Cory Benfield Maintainer-email: Thomas Kriechbaumer License: The MIT License (MIT) Copyright (c) 2015-2020 Cory Benfield and contributors Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Project-URL: Homepage, https://github.com/python-hyper/h2/ Project-URL: Bug Reports, https://github.com/python-hyper/h2/issues Project-URL: Source, https://github.com/python-hyper/h2/ Project-URL: Documentation, https://python-hyper.org/ Classifier: Development Status :: 5 - Production/Stable Classifier: Intended Audience :: Developers Classifier: License :: OSI Approved :: MIT License Classifier: Programming Language :: Python Classifier: Programming Language :: Python :: 3 :: Only Classifier: Programming Language :: Python :: 3 Classifier: Programming Language :: Python :: 3.9 Classifier: Programming Language :: Python :: 3.10 Classifier: Programming Language :: Python :: 3.11 Classifier: Programming Language :: Python :: 3.12 Classifier: Programming Language :: Python :: 3.13 Classifier: Programming Language :: Python :: Implementation :: CPython Classifier: Programming Language :: Python :: Implementation :: PyPy Requires-Python: >=3.9 Description-Content-Type: text/x-rst License-File: LICENSE Requires-Dist: hyperframe<7,>=6.1 Requires-Dist: hpack<5,>=4.1 ========================= h2: HTTP/2 Protocol Stack ========================= .. image:: https://github.com/python-hyper/h2/workflows/CI/badge.svg :target: https://github.com/python-hyper/h2/actions :alt: Build Status .. image:: https://codecov.io/gh/python-hyper/h2/branch/master/graph/badge.svg :target: https://codecov.io/gh/python-hyper/h2 :alt: Code Coverage .. image:: https://readthedocs.org/projects/h2/badge/?version=latest :target: https://h2.readthedocs.io/en/latest/ :alt: Documentation Status .. image:: https://img.shields.io/badge/chat-join_now-brightgreen.svg :target: https://gitter.im/python-hyper/community :alt: Chat community .. image:: https://raw.github.com/python-hyper/documentation/master/source/logo/hyper-black-bg-white.png This repository contains a pure-Python implementation of a HTTP/2 protocol stack. It's written from the ground up to be embeddable in whatever program you choose to use, ensuring that you can speak HTTP/2 regardless of your programming paradigm. You use it like this: .. code-block:: python import h2.connection import h2.config config = h2.config.H2Configuration() conn = h2.connection.H2Connection(config=config) conn.send_headers(stream_id=stream_id, headers=headers) conn.send_data(stream_id, data) socket.sendall(conn.data_to_send()) events = conn.receive_data(socket_data) This repository does not provide a parsing layer, a network layer, or any rules about concurrency. Instead, it's a purely in-memory solution, defined in terms of data actions and HTTP/2 frames. This is one building block of a full Python HTTP implementation. To install it, just run: .. code-block:: console $ python -m pip install h2 Documentation ============= Documentation is available at https://h2.readthedocs.io . Contributing ============ ``h2`` welcomes contributions from anyone! Unlike many other projects we are happy to accept cosmetic contributions and small contributions, in addition to large feature requests and changes. Before you contribute (either by opening an issue or filing a pull request), please `read the contribution guidelines`_. .. _read the contribution guidelines: http://python-hyper.org/en/latest/contributing.html License ======= ``h2`` is made available under the MIT License. For more details, see the ``LICENSE`` file in the repository. Authors ======= ``h2`` was authored by Cory Benfield and is maintained by the members of `python-hyper `_. ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1738482098.0 h2-4.2.0/src/h2.egg-info/SOURCES.txt0000644000076500000240000000571614747620662016074 0ustar00kriechistaffCHANGELOG.rst LICENSE MANIFEST.in README.rst pyproject.toml docs/Makefile docs/make.bat docs/source/advanced-usage.rst docs/source/api.rst docs/source/asyncio-example.rst docs/source/basic-usage.rst docs/source/conf.py docs/source/curio-example.rst docs/source/eventlet-example.rst docs/source/examples.rst docs/source/gevent-example.rst docs/source/index.rst docs/source/installation.rst docs/source/low-level.rst docs/source/negotiating-http2.rst docs/source/plain-sockets-example.rst docs/source/release-notes.rst docs/source/release-process.rst docs/source/testimonials.rst docs/source/tornado-example.rst docs/source/twisted-example.rst docs/source/twisted-head-example.rst docs/source/twisted-post-example.rst docs/source/wsgi-example.rst docs/source/_static/.gitkeep docs/source/_static/h2.connection.H2ConnectionStateMachine.dot.png docs/source/_static/h2.stream.H2StreamStateMachine.dot.png docs/source/_templates/.gitkeep examples/asyncio/asyncio-server.py examples/asyncio/cert.crt examples/asyncio/cert.key examples/asyncio/wsgi-server.py examples/curio/curio-server.py examples/curio/localhost.crt.pem examples/curio/localhost.key examples/eventlet/eventlet-server.py examples/eventlet/server.crt examples/eventlet/server.key examples/fragments/client_https_setup_fragment.py examples/fragments/client_upgrade_fragment.py examples/fragments/server_https_setup_fragment.py examples/fragments/server_upgrade_fragment.py examples/gevent/gevent-server.py examples/gevent/localhost.crt examples/gevent/localhost.key examples/plain_sockets/plain_sockets_client.py examples/tornado/server.crt examples/tornado/server.key examples/tornado/tornado-server.py examples/twisted/head_request.py examples/twisted/post_request.py examples/twisted/server.crt examples/twisted/server.csr examples/twisted/server.key examples/twisted/twisted-server.py src/h2/__init__.py src/h2/config.py src/h2/connection.py src/h2/errors.py src/h2/events.py src/h2/exceptions.py src/h2/frame_buffer.py src/h2/py.typed src/h2/settings.py src/h2/stream.py src/h2/utilities.py src/h2/windows.py src/h2.egg-info/PKG-INFO src/h2.egg-info/SOURCES.txt src/h2.egg-info/dependency_links.txt src/h2.egg-info/requires.txt src/h2.egg-info/top_level.txt tests/__init__.py tests/conftest.py tests/coroutine_tests.py tests/h2spectest.sh tests/helpers.py tests/test_basic_logic.py tests/test_closed_streams.py tests/test_complex_logic.py tests/test_config.py tests/test_events.py tests/test_exceptions.py tests/test_flow_control_window.py tests/test_h2_upgrade.py tests/test_head_request.py tests/test_header_indexing.py tests/test_informational_responses.py tests/test_interacting_stacks.py tests/test_invalid_content_lengths.py tests/test_invalid_frame_sequences.py tests/test_invalid_headers.py tests/test_priority.py tests/test_related_events.py tests/test_rfc7838.py tests/test_rfc8441.py tests/test_settings.py tests/test_state_machines.py tests/test_stream_reset.py tests/test_utility_functions.py visualizer/NOTICES.visualizer visualizer/visualize.py././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1738482098.0 h2-4.2.0/src/h2.egg-info/dependency_links.txt0000644000076500000240000000000114747620662020245 0ustar00kriechistaff ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1738482098.0 h2-4.2.0/src/h2.egg-info/requires.txt0000644000076500000240000000004114747620662016572 0ustar00kriechistaffhyperframe<7,>=6.1 hpack<5,>=4.1 ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1738482098.0 h2-4.2.0/src/h2.egg-info/top_level.txt0000644000076500000240000000000314747620662016722 0ustar00kriechistaffh2 ././@PaxHeader0000000000000000000000000000003400000000000010212 xustar0028 mtime=1738482098.7737546 h2-4.2.0/tests/0000755000076500000240000000000014747620663012550 5ustar00kriechistaff././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737582431.0 h2-4.2.0/tests/__init__.py0000644000076500000240000000000014744263537014647 0ustar00kriechistaff././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/conftest.py0000644000076500000240000000022214744265074014741 0ustar00kriechistafffrom __future__ import annotations import pytest from . import helpers @pytest.fixture def frame_factory(): return helpers.FrameFactory() ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/coroutine_tests.py0000644000076500000240000000515614744265074016360 0ustar00kriechistaff""" This file gives access to a coroutine-based test class. This allows each test case to be defined as a pair of interacting coroutines, sending data to each other by yielding the flow of control. The advantage of this method is that we avoid the difficulty of using threads in Python, as well as the pain of using sockets and events to communicate and organise the communication. This makes the tests entirely deterministic and makes them behave identically on all platforms, as well as ensuring they both succeed and fail quickly. """ from __future__ import annotations import functools import itertools import pytest class CoroutineTestCase: """ A base class for tests that use interacting coroutines. The run_until_complete method takes a number of coroutines as arguments. Each one is, in order, passed the output of the previous coroutine until one is exhausted. If a coroutine does not initially yield data (that is, its first action is to receive data), the calling code should prime it by using the 'server' decorator on this class. """ def run_until_complete(self, *coroutines) -> None: """ Executes a set of coroutines that communicate between each other. Each one is, in order, passed the output of the previous coroutine until one is exhausted. If a coroutine does not initially yield data (that is, its first action is to receive data), the calling code should prime it by using the 'server' decorator on this class. Once a coroutine is exhausted, the method performs a final check to ensure that all other coroutines are exhausted. This ensures that all assertions in those coroutines got executed. """ looping_coroutines = itertools.cycle(coroutines) data = None for coro in looping_coroutines: try: data = coro.send(data) except StopIteration: break for coro in coroutines: try: next(coro) except StopIteration: continue else: pytest.fail(f"Coroutine {coro} not exhausted") def server(self, func): """ A decorator that marks a test coroutine as a 'server' coroutine: that is, one whose first action is to consume data, rather than one that initially emits data. The effect of this decorator is simply to prime the coroutine. """ @functools.wraps(func) def wrapper(*args, **kwargs): c = func(*args, **kwargs) next(c) return c return wrapper ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/h2spectest.sh0000755000076500000240000000070114744265074015167 0ustar00kriechistaff#!/usr/bin/env bash # A test script that runs the example Python Twisted server and then runs # h2spec against it. Prints the output of h2spec. This script does not expect # to be run directly, but instead via `tox -e h2spec`. set -x # Kill all background jobs on exit. trap 'kill $(jobs -p)' EXIT pushd examples/asyncio python asyncio-server.py & popd # Wait briefly to let the server start up sleep 2 # Go go go! h2spec -k -t -v -p 8443 $@ ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/helpers.py0000644000076500000240000001170014744265074014561 0ustar00kriechistaff""" Helper module for the h2 tests. """ from __future__ import annotations from hpack.hpack import Encoder from hyperframe.frame import ( AltSvcFrame, ContinuationFrame, DataFrame, GoAwayFrame, HeadersFrame, PingFrame, PriorityFrame, PushPromiseFrame, RstStreamFrame, SettingsFrame, WindowUpdateFrame, ) SAMPLE_SETTINGS = { SettingsFrame.HEADER_TABLE_SIZE: 4096, SettingsFrame.ENABLE_PUSH: 1, SettingsFrame.MAX_CONCURRENT_STREAMS: 2, } class FrameFactory: """ A class containing lots of helper methods and state to build frames. This allows test cases to easily build correct HTTP/2 frames to feed to hyper-h2. """ def __init__(self) -> None: self.encoder = Encoder() def refresh_encoder(self) -> None: self.encoder = Encoder() def preamble(self) -> bytes: return b"PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n" def build_headers_frame(self, headers, flags=None, stream_id=1, **priority_kwargs): """ Builds a single valid headers frame out of the contained headers. """ if flags is None: flags = [] f = HeadersFrame(stream_id) f.data = self.encoder.encode(headers) f.flags.add("END_HEADERS") for flag in flags: f.flags.add(flag) for k, v in priority_kwargs.items(): setattr(f, k, v) return f def build_continuation_frame(self, header_block, flags=None, stream_id=1): """ Builds a single continuation frame out of the binary header block. """ if flags is None: flags = [] f = ContinuationFrame(stream_id) f.data = header_block f.flags = set(flags) return f def build_data_frame(self, data, flags=None, stream_id=1, padding_len=0): """ Builds a single data frame out of a chunk of data. """ flags = set(flags) if flags is not None else set() f = DataFrame(stream_id) f.data = data f.flags = flags if padding_len: flags.add("PADDED") f.pad_length = padding_len return f def build_settings_frame(self, settings, ack=False): """ Builds a single settings frame. """ f = SettingsFrame(0) if ack: f.flags.add("ACK") f.settings = settings return f def build_window_update_frame(self, stream_id, increment): """ Builds a single WindowUpdate frame. """ f = WindowUpdateFrame(stream_id) f.window_increment = increment return f def build_ping_frame(self, ping_data, flags=None): """ Builds a single Ping frame. """ f = PingFrame(0) f.opaque_data = ping_data if flags: f.flags = set(flags) return f def build_goaway_frame(self, last_stream_id, error_code=0, additional_data=b""): """ Builds a single GOAWAY frame. """ f = GoAwayFrame(0) f.error_code = error_code f.last_stream_id = last_stream_id f.additional_data = additional_data return f def build_rst_stream_frame(self, stream_id, error_code=0): """ Builds a single RST_STREAM frame. """ f = RstStreamFrame(stream_id) f.error_code = error_code return f def build_push_promise_frame(self, stream_id, promised_stream_id, headers, flags=None): """ Builds a single PUSH_PROMISE frame. """ if flags is None: flags = [] f = PushPromiseFrame(stream_id) f.promised_stream_id = promised_stream_id f.data = self.encoder.encode(headers) f.flags = set(flags) f.flags.add("END_HEADERS") return f def build_priority_frame(self, stream_id, weight, depends_on=0, exclusive=False): """ Builds a single priority frame. """ f = PriorityFrame(stream_id) f.depends_on = depends_on f.stream_weight = weight f.exclusive = exclusive return f def build_alt_svc_frame(self, stream_id, origin, field): """ Builds a single ALTSVC frame. """ f = AltSvcFrame(stream_id) f.origin = origin f.field = field return f def change_table_size(self, new_size) -> None: """ Causes the encoder to send a dynamic size update in the next header block it sends. """ self.encoder.header_table_size = new_size ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/test_basic_logic.py0000644000076500000240000020352214744265074016421 0ustar00kriechistaff""" Test the basic logic of the h2 state machines. """ from __future__ import annotations import random import hyperframe import pytest from hpack import HeaderTuple from hypothesis import HealthCheck, given, settings from hypothesis.strategies import integers import h2.config import h2.connection import h2.errors import h2.events import h2.exceptions import h2.frame_buffer import h2.settings import h2.stream from . import helpers class TestBasicClient: """ Basic client-side tests. """ example_request_headers = [ (":authority", "example.com"), (":path", "/"), (":scheme", "https"), (":method", "GET"), ] bytes_example_request_headers = [ (b":authority", b"example.com"), (b":path", b"/"), (b":scheme", b"https"), (b":method", b"GET"), ] example_response_headers = [ (":status", "200"), ("server", "fake-serv/0.1.0"), ] bytes_example_response_headers = [ (b":status", b"200"), (b"server", b"fake-serv/0.1.0"), ] def test_begin_connection(self, frame_factory) -> None: """ Client connections emit the HTTP/2 preamble. """ c = h2.connection.H2Connection() expected_settings = frame_factory.build_settings_frame( c.local_settings, ) expected_data = ( b"PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n" + expected_settings.serialize() ) events = c.initiate_connection() assert not events assert c.data_to_send() == expected_data def test_sending_headers(self) -> None: """ Single headers frames are correctly encoded. """ c = h2.connection.H2Connection() c.initiate_connection() # Clear the data, then send headers. c.clear_outbound_data_buffer() events = c.send_headers(1, self.example_request_headers) assert not events assert c.data_to_send() == ( b"\x00\x00\r\x01\x04\x00\x00\x00\x01" b"A\x88/\x91\xd3]\x05\\\x87\xa7\x84\x87\x82" ) def test_sending_data(self) -> None: """ Single data frames are encoded correctly. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(1, self.example_request_headers) # Clear the data, then send some data. c.clear_outbound_data_buffer() events = c.send_data(1, b"some data") assert not events data_to_send = c.data_to_send() assert ( data_to_send == b"\x00\x00\t\x00\x00\x00\x00\x00\x01some data" ) buffer = h2.frame_buffer.FrameBuffer(server=False) buffer.max_frame_size = 65535 buffer.add_data(data_to_send) data_frame = next(iter(buffer)) sanity_check_data_frame( data_frame=data_frame, expected_flow_controlled_length=len(b"some data"), expect_padded_flag=False, expected_data_frame_pad_length=0, ) def test_sending_data_in_memoryview(self) -> None: """ Support memoryview for sending data. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(1, self.example_request_headers) # Clear the data, then send some data. c.clear_outbound_data_buffer() events = c.send_data(1, memoryview(b"some data")) assert not events data_to_send = c.data_to_send() assert ( data_to_send == b"\x00\x00\t\x00\x00\x00\x00\x00\x01some data" ) def test_sending_data_with_padding(self) -> None: """ Single data frames with padding are encoded correctly. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(1, self.example_request_headers) # Clear the data, then send some data. c.clear_outbound_data_buffer() events = c.send_data(1, b"some data", pad_length=5) assert not events data_to_send = c.data_to_send() assert data_to_send == ( b"\x00\x00\x0f\x00\x08\x00\x00\x00\x01" b"\x05some data\x00\x00\x00\x00\x00" ) buffer = h2.frame_buffer.FrameBuffer(server=False) buffer.max_frame_size = 65535 buffer.add_data(data_to_send) data_frame = next(iter(buffer)) sanity_check_data_frame( data_frame=data_frame, expected_flow_controlled_length=len(b"some data") + 1 + 5, expect_padded_flag=True, expected_data_frame_pad_length=5, ) def test_sending_data_with_zero_length_padding(self) -> None: """ Single data frames with zero-length padding are encoded correctly. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(1, self.example_request_headers) # Clear the data, then send some data. c.clear_outbound_data_buffer() events = c.send_data(1, b"some data", pad_length=0) assert not events data_to_send = c.data_to_send() assert data_to_send == ( b"\x00\x00\x0a\x00\x08\x00\x00\x00\x01" b"\x00some data" ) buffer = h2.frame_buffer.FrameBuffer(server=False) buffer.max_frame_size = 65535 buffer.add_data(data_to_send) data_frame = next(iter(buffer)) sanity_check_data_frame( data_frame=data_frame, expected_flow_controlled_length=len(b"some data") + 1, expect_padded_flag=True, expected_data_frame_pad_length=0, ) @pytest.mark.parametrize(("expected_error", "pad_length"), [ (None, 0), (None, 255), (None, None), (ValueError, -1), (ValueError, 256), (TypeError, "invalid"), (TypeError, ""), (TypeError, "10"), (TypeError, {}), (TypeError, ["1", "2", "3"]), (TypeError, []), (TypeError, 1.5), (TypeError, 1.0), (TypeError, -1.0), ]) def test_sending_data_with_invalid_padding_length(self, expected_error, pad_length) -> None: """ ``send_data`` with a ``pad_length`` parameter that is an integer outside the range of [0, 255] throws a ``ValueError``, and a ``pad_length`` parameter which is not an ``integer`` type throws a ``TypeError``. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(1, self.example_request_headers) c.clear_outbound_data_buffer() if expected_error is not None: with pytest.raises(expected_error): c.send_data(1, b"some data", pad_length=pad_length) else: c.send_data(1, b"some data", pad_length=pad_length) def test_closing_stream_sending_data(self, frame_factory) -> None: """ We can close a stream with a data frame. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(1, self.example_request_headers) f = frame_factory.build_data_frame( data=b"some data", flags=["END_STREAM"], ) # Clear the data, then send some data. c.clear_outbound_data_buffer() events = c.send_data(1, b"some data", end_stream=True) assert not events assert c.data_to_send() == f.serialize() def test_receiving_a_response(self, frame_factory) -> None: """ When receiving a response, the ResponseReceived event fires. """ config = h2.config.H2Configuration(header_encoding="utf-8") c = h2.connection.H2Connection(config=config) c.initiate_connection() c.send_headers(1, self.example_request_headers, end_stream=True) # Clear the data f = frame_factory.build_headers_frame( self.example_response_headers, ) events = c.receive_data(f.serialize()) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.ResponseReceived) assert event.stream_id == 1 assert event.headers == self.example_response_headers def test_receiving_a_response_bytes(self, frame_factory) -> None: """ When receiving a response, the ResponseReceived event fires with bytes headers if the encoding is set appropriately. """ config = h2.config.H2Configuration(header_encoding=False) c = h2.connection.H2Connection(config=config) c.initiate_connection() c.send_headers(1, self.example_request_headers, end_stream=True) # Clear the data f = frame_factory.build_headers_frame( self.example_response_headers, ) events = c.receive_data(f.serialize()) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.ResponseReceived) assert event.stream_id == 1 assert event.headers == self.bytes_example_response_headers def test_receiving_a_response_change_encoding(self, frame_factory) -> None: """ When receiving a response, the ResponseReceived event fires with bytes headers if the encoding is set appropriately, but if this changes then the change reflects it. """ config = h2.config.H2Configuration(header_encoding=False) c = h2.connection.H2Connection(config=config) c.initiate_connection() c.send_headers(1, self.example_request_headers, end_stream=True) f = frame_factory.build_headers_frame( self.example_response_headers, ) events = c.receive_data(f.serialize()) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.ResponseReceived) assert event.stream_id == 1 assert event.headers == self.bytes_example_response_headers c.send_headers(3, self.example_request_headers, end_stream=True) c.config.header_encoding = "utf-8" f = frame_factory.build_headers_frame( self.example_response_headers, stream_id=3, ) events = c.receive_data(f.serialize()) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.ResponseReceived) assert event.stream_id == 3 assert event.headers == self.example_response_headers def test_end_stream_without_data(self, frame_factory) -> None: """ Ending a stream without data emits a zero-length DATA frame with END_STREAM set. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(1, self.example_request_headers, end_stream=False) # Clear the data c.clear_outbound_data_buffer() f = frame_factory.build_data_frame(b"", flags=["END_STREAM"]) events = c.end_stream(1) assert not events assert c.data_to_send() == f.serialize() def test_cannot_send_headers_on_lower_stream_id(self) -> None: """ Once stream ID x has been used, cannot use stream ID y where y < x. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(3, self.example_request_headers, end_stream=False) with pytest.raises(h2.exceptions.StreamIDTooLowError) as e: c.send_headers(1, self.example_request_headers, end_stream=True) assert e.value.stream_id == 1 assert e.value.max_stream_id == 3 def test_receiving_pushed_stream(self, frame_factory) -> None: """ Pushed streams fire a PushedStreamReceived event, followed by ResponseReceived when the response headers are received. """ config = h2.config.H2Configuration(header_encoding="utf-8") c = h2.connection.H2Connection(config=config) c.initiate_connection() c.send_headers(1, self.example_request_headers, end_stream=False) f1 = frame_factory.build_headers_frame( self.example_response_headers, ) f2 = frame_factory.build_push_promise_frame( stream_id=1, promised_stream_id=2, headers=self.example_request_headers, flags=["END_HEADERS"], ) f3 = frame_factory.build_headers_frame( self.example_response_headers, stream_id=2, ) data = b"".join(x.serialize() for x in [f1, f2, f3]) events = c.receive_data(data) assert len(events) == 3 stream_push_event = events[1] response_event = events[2] assert isinstance(stream_push_event, h2.events.PushedStreamReceived) assert isinstance(response_event, h2.events.ResponseReceived) assert stream_push_event.pushed_stream_id == 2 assert stream_push_event.parent_stream_id == 1 assert ( stream_push_event.headers == self.example_request_headers ) assert response_event.stream_id == 2 assert response_event.headers == self.example_response_headers def test_receiving_pushed_stream_bytes(self, frame_factory) -> None: """ Pushed headers are not decoded if the header encoding is set to False. """ config = h2.config.H2Configuration(header_encoding=False) c = h2.connection.H2Connection(config=config) c.initiate_connection() c.send_headers(1, self.example_request_headers, end_stream=False) f1 = frame_factory.build_headers_frame( self.example_response_headers, ) f2 = frame_factory.build_push_promise_frame( stream_id=1, promised_stream_id=2, headers=self.example_request_headers, flags=["END_HEADERS"], ) f3 = frame_factory.build_headers_frame( self.example_response_headers, stream_id=2, ) data = b"".join(x.serialize() for x in [f1, f2, f3]) events = c.receive_data(data) assert len(events) == 3 stream_push_event = events[1] response_event = events[2] assert isinstance(stream_push_event, h2.events.PushedStreamReceived) assert isinstance(response_event, h2.events.ResponseReceived) assert stream_push_event.pushed_stream_id == 2 assert stream_push_event.parent_stream_id == 1 assert ( stream_push_event.headers == self.bytes_example_request_headers ) assert response_event.stream_id == 2 assert response_event.headers == self.bytes_example_response_headers def test_cannot_receive_pushed_stream_when_enable_push_is_0(self, frame_factory) -> None: """ If we have set SETTINGS_ENABLE_PUSH to 0, receiving PUSH_PROMISE frames triggers the connection to be closed. """ c = h2.connection.H2Connection() c.initiate_connection() c.local_settings.enable_push = 0 c.send_headers(1, self.example_request_headers, end_stream=False) f1 = frame_factory.build_settings_frame({}, ack=True) f2 = frame_factory.build_headers_frame( self.example_response_headers, ) f3 = frame_factory.build_push_promise_frame( stream_id=1, promised_stream_id=2, headers=self.example_request_headers, flags=["END_HEADERS"], ) c.receive_data(f1.serialize()) c.receive_data(f2.serialize()) c.clear_outbound_data_buffer() with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(f3.serialize()) expected_frame = frame_factory.build_goaway_frame( 0, h2.errors.ErrorCodes.PROTOCOL_ERROR, ) assert c.data_to_send() == expected_frame.serialize() def test_receiving_response_no_body(self, frame_factory) -> None: """ Receiving a response without a body fires two events, ResponseReceived and StreamEnded. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(1, self.example_request_headers, end_stream=True) f = frame_factory.build_headers_frame( self.example_response_headers, flags=["END_STREAM"], ) events = c.receive_data(f.serialize()) assert len(events) == 2 response_event = events[0] end_stream = events[1] assert isinstance(response_event, h2.events.ResponseReceived) assert isinstance(end_stream, h2.events.StreamEnded) def test_oversize_headers(self) -> None: """ Sending headers that are oversized generates a stream of CONTINUATION frames. """ all_bytes = [chr(x).encode("latin1") for x in range(256)] large_binary_string = b"".join( random.choice(all_bytes) for _ in range(256) ) test_headers = [ (":authority", "example.com"), (":path", "/"), (":method", "GET"), (":scheme", "https"), ("key", large_binary_string), ] c = h2.connection.H2Connection() # Greatly shrink the max frame size to force us over. c.max_outbound_frame_size = 48 c.initiate_connection() c.send_headers(1, test_headers, end_stream=True) # Use the frame buffer here, because we don't care about decoding # the headers. Don't send all the data in because that will force the # frame buffer to stop caching the CONTINUATION frames, so instead # send all but one byte. buffer = h2.frame_buffer.FrameBuffer(server=True) buffer.max_frame_size = 65535 data = c.data_to_send() buffer.add_data(data[:-1]) # Drain the buffer, confirming that it only provides a single frame # (the settings frame) assert len(list(buffer)) == 1 # Get the cached frames. frames = buffer._headers_buffer # Split the frames up. headers_frame = frames[0] continuation_frames = frames[1:] assert isinstance(headers_frame, hyperframe.frame.HeadersFrame) assert all( (isinstance(f, hyperframe.frame.ContinuationFrame) for f in continuation_frames), ) assert all( (len(f.data) <= c.max_outbound_frame_size for f in frames), ) assert frames[0].flags == {"END_STREAM"} buffer.add_data(data[-1:]) headers = next(iter(buffer)) assert isinstance(headers, hyperframe.frame.HeadersFrame) def test_handle_stream_reset(self, frame_factory) -> None: """ Streams being remotely reset fires a StreamReset event. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(1, self.example_request_headers, end_stream=True) c.clear_outbound_data_buffer() f = frame_factory.build_rst_stream_frame( stream_id=1, error_code=h2.errors.ErrorCodes.STREAM_CLOSED, ) events = c.receive_data(f.serialize()) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.StreamReset) assert event.stream_id == 1 assert event.error_code is h2.errors.ErrorCodes.STREAM_CLOSED assert isinstance(event.error_code, h2.errors.ErrorCodes) assert event.remote_reset def test_handle_stream_reset_with_unknown_erorr_code(self, frame_factory) -> None: """ Streams being remotely reset with unknown error codes behave exactly as they do with known error codes, but the error code on the event is an int, instead of being an ErrorCodes. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(1, self.example_request_headers, end_stream=True) c.clear_outbound_data_buffer() f = frame_factory.build_rst_stream_frame(stream_id=1, error_code=0xFA) events = c.receive_data(f.serialize()) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.StreamReset) assert event.stream_id == 1 assert event.error_code == 250 assert not isinstance(event.error_code, h2.errors.ErrorCodes) assert event.remote_reset def test_can_consume_partial_data_from_connection(self) -> None: """ We can do partial reads from the connection. """ c = h2.connection.H2Connection() c.initiate_connection() assert len(c.data_to_send(2)) == 2 assert len(c.data_to_send(3)) == 3 assert 0 < len(c.data_to_send(500)) < 500 assert len(c.data_to_send(10)) == 0 assert len(c.data_to_send()) == 0 def test_we_can_update_settings(self, frame_factory) -> None: """ Updating the settings emits a SETTINGS frame. """ c = h2.connection.H2Connection() c.initiate_connection() c.clear_outbound_data_buffer() new_settings = { h2.settings.SettingCodes.HEADER_TABLE_SIZE: 52, h2.settings.SettingCodes.ENABLE_PUSH: 0, } events = c.update_settings(new_settings) assert not events f = frame_factory.build_settings_frame(new_settings) assert c.data_to_send() == f.serialize() def test_settings_get_acked_correctly(self, frame_factory) -> None: """ When settings changes are ACKed, they contain the changed settings. """ c = h2.connection.H2Connection() c.initiate_connection() new_settings = { h2.settings.SettingCodes.HEADER_TABLE_SIZE: 52, h2.settings.SettingCodes.ENABLE_PUSH: 0, } c.update_settings(new_settings) f = frame_factory.build_settings_frame({}, ack=True) events = c.receive_data(f.serialize()) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.SettingsAcknowledged) assert len(event.changed_settings) == len(new_settings) for setting, value in new_settings.items(): assert event.changed_settings[setting].new_value == value def test_cannot_create_new_outbound_stream_over_limit(self, frame_factory) -> None: """ When the number of outbound streams exceeds the remote peer's MAX_CONCURRENT_STREAMS setting, attempting to open new streams fails. """ c = h2.connection.H2Connection() c.initiate_connection() f = frame_factory.build_settings_frame( {h2.settings.SettingCodes.MAX_CONCURRENT_STREAMS: 1}, ) c.receive_data(f.serialize())[0] c.send_headers(1, self.example_request_headers) with pytest.raises(h2.exceptions.TooManyStreamsError): c.send_headers(3, self.example_request_headers) def test_can_receive_trailers(self, frame_factory) -> None: """ When two HEADERS blocks are received in the same stream from a server, the second set are trailers. """ config = h2.config.H2Configuration(header_encoding="utf-8") c = h2.connection.H2Connection(config=config) c.initiate_connection() c.send_headers(1, self.example_request_headers) f = frame_factory.build_headers_frame(self.example_response_headers) c.receive_data(f.serialize()) # Send in trailers. trailers = [("content-length", "0")] f = frame_factory.build_headers_frame( trailers, flags=["END_STREAM"], ) events = c.receive_data(f.serialize()) assert len(events) == 2 event = events[0] assert isinstance(event, h2.events.TrailersReceived) assert event.headers == trailers assert event.stream_id == 1 def test_reject_trailers_not_ending_stream(self, frame_factory) -> None: """ When trailers are received without the END_STREAM flag being present, this is a ProtocolError. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(1, self.example_request_headers) f = frame_factory.build_headers_frame(self.example_response_headers) c.receive_data(f.serialize()) # Send in trailers. c.clear_outbound_data_buffer() trailers = [("content-length", "0")] f = frame_factory.build_headers_frame( trailers, flags=[], ) with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(f.serialize()) expected_frame = frame_factory.build_goaway_frame( last_stream_id=0, error_code=h2.errors.ErrorCodes.PROTOCOL_ERROR, ) assert c.data_to_send() == expected_frame.serialize() def test_can_send_trailers(self, frame_factory) -> None: """ When a second set of headers are sent, they are properly trailers. """ c = h2.connection.H2Connection() c.initiate_connection() c.clear_outbound_data_buffer() c.send_headers(1, self.example_request_headers) # Now send trailers. trailers = [("content-length", "0")] c.send_headers(1, trailers, end_stream=True) frame_factory.refresh_encoder() f1 = frame_factory.build_headers_frame( self.example_request_headers, ) f2 = frame_factory.build_headers_frame( trailers, flags=["END_STREAM"], ) assert c.data_to_send() == f1.serialize() + f2.serialize() def test_trailers_must_have_end_stream(self, frame_factory) -> None: """ A set of trailers must carry the END_STREAM flag. """ c = h2.connection.H2Connection() c.initiate_connection() # Send headers. c.send_headers(1, self.example_request_headers) # Now send trailers. trailers = [("content-length", "0")] with pytest.raises(h2.exceptions.ProtocolError): c.send_headers(1, trailers) def test_headers_are_lowercase(self, frame_factory) -> None: """ When headers are sent, they are forced to lower-case. """ weird_headers = [*self.example_request_headers, ("ChAnGiNg-CaSe", "AlsoHere"), ("alllowercase", "alllowercase"), ("ALLCAPS", "ALLCAPS")] expected_headers = [*self.example_request_headers, ("changing-case", "AlsoHere"), ("alllowercase", "alllowercase"), ("allcaps", "ALLCAPS")] c = h2.connection.H2Connection() c.initiate_connection() c.clear_outbound_data_buffer() c.send_headers(1, weird_headers) expected_frame = frame_factory.build_headers_frame( headers=expected_headers, ) assert c.data_to_send() == expected_frame.serialize() def test_outbound_cookie_headers_are_split(self) -> None: """ We should split outbound cookie headers according to RFC 7540 - 8.1.2.5 """ cookie_headers = [ HeaderTuple("cookie", "username=John Doe; expires=Thu, 18 Dec 2013 12:00:00 UTC"), ("cookie", "path=1"), ("cookie", "test1=val1; test2=val2"), ] expected_cookie_headers = [ HeaderTuple("cookie", "username=John Doe"), HeaderTuple("cookie", "expires=Thu, 18 Dec 2013 12:00:00 UTC"), ("cookie", "path=1"), ("cookie", "test1=val1"), ("cookie", "test2=val2"), ] client_config = h2.config.H2Configuration( client_side=True, header_encoding="utf-8", split_outbound_cookies=True, ) server_config = h2.config.H2Configuration( client_side=False, normalize_inbound_headers=False, header_encoding="utf-8", ) client = h2.connection.H2Connection(config=client_config) server = h2.connection.H2Connection(config=server_config) client.initiate_connection() client.send_headers(1, self.example_request_headers + cookie_headers, end_stream=True) e = server.receive_data(client.data_to_send()) cookie_fields = [(n, v) for n, v in e[1].headers if n == "cookie"] assert cookie_fields == expected_cookie_headers @given(frame_size=integers(min_value=2**14, max_value=(2**24 - 1))) @settings(suppress_health_check=[HealthCheck.function_scoped_fixture]) def test_changing_max_frame_size(self, frame_factory, frame_size) -> None: """ When the user changes the max frame size and the change is ACKed, the remote peer is now bound by the new frame size. """ # We need to refresh the encoder because hypothesis has a problem with # integrating with py.test, meaning that we use the same frame factory # for all tests. # See https://github.com/HypothesisWorks/hypothesis-python/issues/377 frame_factory.refresh_encoder() c = h2.connection.H2Connection() c.initiate_connection() # Set up the stream. c.send_headers(1, self.example_request_headers, end_stream=True) headers_frame = frame_factory.build_headers_frame( headers=self.example_response_headers, ) c.receive_data(headers_frame.serialize()) # Change the max frame size. c.update_settings( {h2.settings.SettingCodes.MAX_FRAME_SIZE: frame_size}, ) settings_ack = frame_factory.build_settings_frame({}, ack=True) c.receive_data(settings_ack.serialize()) # Greatly increase the flow control windows: we're not here to test # flow control today. c.increment_flow_control_window(increment=(2 * frame_size) + 1) c.increment_flow_control_window( increment=(2 * frame_size) + 1, stream_id=1, ) # Send one DATA frame that is exactly the max frame size: confirm it's # fine. data = frame_factory.build_data_frame( data=(b"\x00" * frame_size), ) events = c.receive_data(data.serialize()) assert len(events) == 1 assert isinstance(events[0], h2.events.DataReceived) assert events[0].flow_controlled_length == frame_size # Send one that is one byte too large: confirm a protocol error is # raised. data.data += b"\x00" with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(data.serialize()) def test_cookies_are_joined_on_push(self, frame_factory) -> None: """ RFC 7540 Section 8.1.2.5 requires that we join multiple Cookie headers in a header block together when they're received on a push. """ # This is a moderately varied set of cookie headers: some combined, # some split. cookie_headers = [ ("cookie", "username=John Doe; expires=Thu, 18 Dec 2013 12:00:00 UTC"), ("cookie", "path=1"), ("cookie", "test1=val1; test2=val2"), ] expected = ( "username=John Doe; expires=Thu, 18 Dec 2013 12:00:00 UTC; " "path=1; test1=val1; test2=val2" ) config = h2.config.H2Configuration(header_encoding="utf-8") c = h2.connection.H2Connection(config=config) c.initiate_connection() c.send_headers(1, self.example_request_headers, end_stream=True) f = frame_factory.build_push_promise_frame( stream_id=1, promised_stream_id=2, headers=self.example_request_headers + cookie_headers, ) events = c.receive_data(f.serialize()) assert len(events) == 1 e = events[0] cookie_fields = [(n, v) for n, v in e.headers if n == "cookie"] assert len(cookie_fields) == 1 _, v = cookie_fields[0] assert v == expected def test_cookies_arent_joined_without_normalization(self, frame_factory) -> None: """ If inbound header normalization is disabled, cookie headers aren't joined. """ # This is a moderately varied set of cookie headers: some combined, # some split. cookie_headers = [ ("cookie", "username=John Doe; expires=Thu, 18 Dec 2013 12:00:00 UTC"), ("cookie", "path=1"), ("cookie", "test1=val1; test2=val2"), ] config = h2.config.H2Configuration( client_side=True, normalize_inbound_headers=False, header_encoding="utf-8", ) c = h2.connection.H2Connection(config=config) c.initiate_connection() c.send_headers(1, self.example_request_headers, end_stream=True) f = frame_factory.build_push_promise_frame( stream_id=1, promised_stream_id=2, headers=self.example_request_headers + cookie_headers, ) events = c.receive_data(f.serialize()) assert len(events) == 1 e = events[0] received_cookies = [(n, v) for n, v in e.headers if n == "cookie"] assert len(received_cookies) == 3 assert cookie_headers == received_cookies class TestBasicServer: """ Basic server-side tests. """ example_request_headers = [ (":authority", "example.com"), (":path", "/"), (":scheme", "https"), (":method", "GET"), ] bytes_example_request_headers = [ (b":authority", b"example.com"), (b":path", b"/"), (b":scheme", b"https"), (b":method", b"GET"), ] example_response_headers = [ (":status", "200"), ("server", "hyper-h2/0.1.0"), ] server_config = h2.config.H2Configuration( client_side=False, header_encoding="utf-8", ) def test_ignores_preamble(self) -> None: """ The preamble does not cause any events or frames to be written. """ c = h2.connection.H2Connection(config=self.server_config) preamble = b"PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n" events = c.receive_data(preamble) assert not events assert not c.data_to_send() @pytest.mark.parametrize("chunk_size", range(1, 24)) def test_drip_feed_preamble(self, chunk_size) -> None: """ The preamble can be sent in in less than a single buffer. """ c = h2.connection.H2Connection(config=self.server_config) preamble = b"PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n" events = [] for i in range(0, len(preamble), chunk_size): events += c.receive_data(preamble[i:i+chunk_size]) assert not events assert not c.data_to_send() def test_initiate_connection_sends_server_preamble(self, frame_factory) -> None: """ For server-side connections, initiate_connection sends a server preamble. """ c = h2.connection.H2Connection(config=self.server_config) expected_settings = frame_factory.build_settings_frame( c.local_settings, ) expected_data = expected_settings.serialize() events = c.initiate_connection() assert not events assert c.data_to_send() == expected_data def test_headers_event(self, frame_factory) -> None: """ When a headers frame is received a RequestReceived event fires. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame(self.example_request_headers) data = f.serialize() events = c.receive_data(data) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.RequestReceived) assert event.stream_id == 1 assert event.headers == self.example_request_headers def test_headers_event_bytes(self, frame_factory) -> None: """ When a headers frame is received a RequestReceived event fires with bytes headers if the encoding is set appropriately. """ config = h2.config.H2Configuration( client_side=False, header_encoding=False, ) c = h2.connection.H2Connection(config=config) c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame(self.example_request_headers) data = f.serialize() events = c.receive_data(data) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.RequestReceived) assert event.stream_id == 1 assert event.headers == self.bytes_example_request_headers def test_data_event(self, frame_factory) -> None: """ Test that data received on a stream fires a DataReceived event. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) f1 = frame_factory.build_headers_frame( self.example_request_headers, stream_id=3, ) f2 = frame_factory.build_data_frame( b"some request data", stream_id=3, ) data = b"".join(f.serialize() for f in [f1, f2]) events = c.receive_data(data) assert len(events) == 2 event = events[1] assert isinstance(event, h2.events.DataReceived) assert event.stream_id == 3 assert event.data == b"some request data" assert event.flow_controlled_length == 17 def test_data_event_with_padding(self, frame_factory) -> None: """ Test that data received on a stream fires a DataReceived event that accounts for padding. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) f1 = frame_factory.build_headers_frame( self.example_request_headers, stream_id=3, ) f2 = frame_factory.build_data_frame( b"some request data", stream_id=3, padding_len=20, ) data = b"".join(f.serialize() for f in [f1, f2]) events = c.receive_data(data) assert len(events) == 2 event = events[1] assert isinstance(event, h2.events.DataReceived) assert event.stream_id == 3 assert event.data == b"some request data" assert event.flow_controlled_length == 17 + 20 + 1 def test_receiving_ping_frame(self, frame_factory) -> None: """ Ping frames should be immediately ACKed. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) ping_data = b"\x01" * 8 sent_frame = frame_factory.build_ping_frame(ping_data) expected_frame = frame_factory.build_ping_frame( ping_data, flags=["ACK"], ) expected_data = expected_frame.serialize() c.clear_outbound_data_buffer() events = c.receive_data(sent_frame.serialize()) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.PingReceived) assert event.ping_data == ping_data assert c.data_to_send() == expected_data def test_receiving_settings_frame_event(self, frame_factory) -> None: """ Settings frames should cause a RemoteSettingsChanged event to fire. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) f = frame_factory.build_settings_frame( settings=helpers.SAMPLE_SETTINGS, ) events = c.receive_data(f.serialize()) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.RemoteSettingsChanged) assert len(event.changed_settings) == len(helpers.SAMPLE_SETTINGS) def test_acknowledging_settings(self, frame_factory) -> None: """ Acknowledging settings causes appropriate Settings frame to be emitted. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) received_frame = frame_factory.build_settings_frame( settings=helpers.SAMPLE_SETTINGS, ) expected_frame = frame_factory.build_settings_frame( settings={}, ack=True, ) expected_data = expected_frame.serialize() c.clear_outbound_data_buffer() events = c.receive_data(received_frame.serialize()) assert len(events) == 1 assert c.data_to_send() == expected_data def test_close_connection(self, frame_factory) -> None: """ Closing the connection with no error code emits a GOAWAY frame with error code 0. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) f = frame_factory.build_goaway_frame(last_stream_id=0) expected_data = f.serialize() c.clear_outbound_data_buffer() events = c.close_connection() assert not events assert c.data_to_send() == expected_data @pytest.mark.parametrize("error_code", h2.errors.ErrorCodes) def test_close_connection_with_error_code(self, frame_factory, error_code) -> None: """ Closing the connection with an error code emits a GOAWAY frame with that error code. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) f = frame_factory.build_goaway_frame( error_code=error_code, last_stream_id=0, ) expected_data = f.serialize() c.clear_outbound_data_buffer() events = c.close_connection(error_code) assert not events assert c.data_to_send() == expected_data @pytest.mark.parametrize(("last_stream_id", "output"), [ (None, 23), (0, 0), (42, 42), ]) def test_close_connection_with_last_stream_id(self, frame_factory, last_stream_id, output) -> None: """ Closing the connection with last_stream_id set emits a GOAWAY frame with that value. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) headers_frame = frame_factory.build_headers_frame( [ (":authority", "example.com"), (":path", "/"), (":scheme", "https"), (":method", "GET"), ], stream_id=23) c.receive_data(headers_frame.serialize()) f = frame_factory.build_goaway_frame( last_stream_id=output, ) expected_data = f.serialize() c.clear_outbound_data_buffer() events = c.close_connection(last_stream_id=last_stream_id) assert not events assert c.data_to_send() == expected_data @pytest.mark.parametrize(("additional_data", "output"), [ (None, b""), (b"", b""), (b"foobar", b"foobar"), ]) def test_close_connection_with_additional_data(self, frame_factory, additional_data, output) -> None: """ Closing the connection with additional debug data emits a GOAWAY frame with that data attached. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) f = frame_factory.build_goaway_frame( last_stream_id=0, additional_data=output, ) expected_data = f.serialize() c.clear_outbound_data_buffer() events = c.close_connection(additional_data=additional_data) assert not events assert c.data_to_send() == expected_data def test_reset_stream(self, frame_factory) -> None: """ Resetting a stream with no error code emits a RST_STREAM frame with error code 0. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame(self.example_request_headers) c.receive_data(f.serialize()) c.clear_outbound_data_buffer() expected_frame = frame_factory.build_rst_stream_frame(stream_id=1) expected_data = expected_frame.serialize() events = c.reset_stream(stream_id=1) assert not events assert c.data_to_send() == expected_data @pytest.mark.parametrize("error_code", h2.errors.ErrorCodes) def test_reset_stream_with_error_code(self, frame_factory, error_code) -> None: """ Resetting a stream with an error code emits a RST_STREAM frame with that error code. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame( self.example_request_headers, stream_id=3, ) c.receive_data(f.serialize()) c.clear_outbound_data_buffer() expected_frame = frame_factory.build_rst_stream_frame( stream_id=3, error_code=error_code, ) expected_data = expected_frame.serialize() events = c.reset_stream(stream_id=3, error_code=error_code) assert not events assert c.data_to_send() == expected_data def test_cannot_reset_nonexistent_stream(self, frame_factory) -> None: """ Resetting nonexistent streams raises NoSuchStreamError. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame( self.example_request_headers, stream_id=3, ) c.receive_data(f.serialize()) with pytest.raises(h2.exceptions.NoSuchStreamError) as e: c.reset_stream(stream_id=1) assert e.value.stream_id == 1 with pytest.raises(h2.exceptions.NoSuchStreamError) as e: c.reset_stream(stream_id=5) assert e.value.stream_id == 5 def test_basic_sending_ping_frame_logic(self, frame_factory) -> None: """ Sending ping frames serializes a ping frame on stream 0 with appropriate opaque data. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() ping_data = b"\x01\x02\x03\x04\x05\x06\x07\x08" expected_frame = frame_factory.build_ping_frame(ping_data) expected_data = expected_frame.serialize() events = c.ping(ping_data) assert not events assert c.data_to_send() == expected_data @pytest.mark.parametrize( "opaque_data", [ b"", b"\x01\x02\x03\x04\x05\x06\x07", "abcdefgh", b"too many bytes", ], ) def test_ping_frame_opaque_data_must_be_length_8_bytestring(self, frame_factory, opaque_data) -> None: """ Sending a ping frame only works with 8-byte bytestrings. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) with pytest.raises(ValueError): c.ping(opaque_data) def test_receiving_ping_acknowledgement(self, frame_factory) -> None: """ Receiving a PING acknowledgement fires a PingAckReceived event. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) ping_data = b"\x01\x02\x03\x04\x05\x06\x07\x08" f = frame_factory.build_ping_frame( ping_data, flags=["ACK"], ) events = c.receive_data(f.serialize()) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.PingAckReceived) assert event.ping_data == ping_data def test_stream_ended_remotely(self, frame_factory) -> None: """ When the remote stream ends with a non-empty data frame a DataReceived event and a StreamEnded event are fired. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) f1 = frame_factory.build_headers_frame( self.example_request_headers, stream_id=3, ) f2 = frame_factory.build_data_frame( b"some request data", flags=["END_STREAM"], stream_id=3, ) data = b"".join(f.serialize() for f in [f1, f2]) events = c.receive_data(data) assert len(events) == 3 data_event = events[1] stream_ended_event = events[2] assert isinstance(data_event, h2.events.DataReceived) assert isinstance(stream_ended_event, h2.events.StreamEnded) stream_ended_event.stream_id == 3 def test_can_push_stream(self, frame_factory) -> None: """ Pushing a stream causes a PUSH_PROMISE frame to be emitted. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame( self.example_request_headers, ) c.receive_data(f.serialize()) frame_factory.refresh_encoder() expected_frame = frame_factory.build_push_promise_frame( stream_id=1, promised_stream_id=2, headers=self.example_request_headers, flags=["END_HEADERS"], ) c.clear_outbound_data_buffer() c.push_stream( stream_id=1, promised_stream_id=2, request_headers=self.example_request_headers, ) assert c.data_to_send() == expected_frame.serialize() def test_cannot_push_streams_when_disabled(self, frame_factory) -> None: """ When the remote peer has disabled stream pushing, we should fail. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) f = frame_factory.build_settings_frame( {h2.settings.SettingCodes.ENABLE_PUSH: 0}, ) c.receive_data(f.serialize()) f = frame_factory.build_headers_frame( self.example_request_headers, ) c.receive_data(f.serialize()) with pytest.raises(h2.exceptions.ProtocolError): c.push_stream( stream_id=1, promised_stream_id=2, request_headers=self.example_request_headers, ) def test_settings_remote_change_header_table_size(self, frame_factory) -> None: """ Acknowledging a remote HEADER_TABLE_SIZE settings change causes us to change the header table size of our encoder. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) assert c.encoder.header_table_size == 4096 received_frame = frame_factory.build_settings_frame( {h2.settings.SettingCodes.HEADER_TABLE_SIZE: 80}, ) c.receive_data(received_frame.serialize())[0] assert c.encoder.header_table_size == 80 def test_settings_local_change_header_table_size(self, frame_factory) -> None: """ The remote peer acknowledging a local HEADER_TABLE_SIZE settings change does not cause us to change the header table size of our decoder. For an explanation of why this test is this way around, see issue #37. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) assert c.decoder.header_table_size == 4096 expected_frame = frame_factory.build_settings_frame({}, ack=True) c.update_settings( {h2.settings.SettingCodes.HEADER_TABLE_SIZE: 80}, ) c.receive_data(expected_frame.serialize()) c.clear_outbound_data_buffer() assert c.decoder.header_table_size == 4096 def test_restricting_outbound_frame_size_by_settings(self, frame_factory) -> None: """ The remote peer can shrink the maximum outbound frame size using settings. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame(self.example_request_headers) c.receive_data(f.serialize()) c.clear_outbound_data_buffer() with pytest.raises(h2.exceptions.FrameTooLargeError): c.send_data(1, b"\x01" * 17000) received_frame = frame_factory.build_settings_frame( {h2.settings.SettingCodes.MAX_FRAME_SIZE: 17001}, ) c.receive_data(received_frame.serialize()) c.send_data(1, b"\x01" * 17000) assert c.data_to_send() def test_restricting_inbound_frame_size_by_settings(self, frame_factory) -> None: """ We throw ProtocolErrors and tear down connections if oversize frames are received. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) h = frame_factory.build_headers_frame(self.example_request_headers) c.receive_data(h.serialize()) c.clear_outbound_data_buffer() data_frame = frame_factory.build_data_frame(b"\x01" * 17000) with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(data_frame.serialize()) expected_frame = frame_factory.build_goaway_frame( last_stream_id=1, error_code=h2.errors.ErrorCodes.FRAME_SIZE_ERROR, ) assert c.data_to_send() == expected_frame.serialize() def test_cannot_receive_new_streams_over_limit(self, frame_factory) -> None: """ When the number of inbound streams exceeds our MAX_CONCURRENT_STREAMS setting, their attempt to open new streams fails. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) c.update_settings( {h2.settings.SettingCodes.MAX_CONCURRENT_STREAMS: 1}, ) f = frame_factory.build_settings_frame({}, ack=True) c.receive_data(f.serialize()) f = frame_factory.build_headers_frame( stream_id=1, headers=self.example_request_headers, ) c.receive_data(f.serialize()) c.clear_outbound_data_buffer() f = frame_factory.build_headers_frame( stream_id=3, headers=self.example_request_headers, ) with pytest.raises(h2.exceptions.TooManyStreamsError): c.receive_data(f.serialize()) expected_frame = frame_factory.build_goaway_frame( last_stream_id=1, error_code=h2.errors.ErrorCodes.PROTOCOL_ERROR, ) assert c.data_to_send() == expected_frame.serialize() def test_can_receive_trailers(self, frame_factory) -> None: """ When two HEADERS blocks are received in the same stream from a client, the second set are trailers. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame(self.example_request_headers) c.receive_data(f.serialize()) # Send in trailers. trailers = [("content-length", "0")] f = frame_factory.build_headers_frame( trailers, flags=["END_STREAM"], ) events = c.receive_data(f.serialize()) assert len(events) == 2 event = events[0] assert isinstance(event, h2.events.TrailersReceived) assert event.headers == trailers assert event.stream_id == 1 def test_reject_trailers_not_ending_stream(self, frame_factory) -> None: """ When trailers are received without the END_STREAM flag being present, this is a ProtocolError. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame(self.example_request_headers) c.receive_data(f.serialize()) # Send in trailers. c.clear_outbound_data_buffer() trailers = [("content-length", "0")] f = frame_factory.build_headers_frame( trailers, flags=[], ) with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(f.serialize()) expected_frame = frame_factory.build_goaway_frame( last_stream_id=1, error_code=h2.errors.ErrorCodes.PROTOCOL_ERROR, ) assert c.data_to_send() == expected_frame.serialize() def test_can_send_trailers(self, frame_factory) -> None: """ When a second set of headers are sent, they are properly trailers. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame(self.example_request_headers) c.receive_data(f.serialize()) # Send headers. c.clear_outbound_data_buffer() c.send_headers(1, self.example_response_headers) # Now send trailers. trailers = [("content-length", "0")] c.send_headers(1, trailers, end_stream=True) frame_factory.refresh_encoder() f1 = frame_factory.build_headers_frame( self.example_response_headers, ) f2 = frame_factory.build_headers_frame( trailers, flags=["END_STREAM"], ) assert c.data_to_send() == f1.serialize() + f2.serialize() def test_trailers_must_have_end_stream(self, frame_factory) -> None: """ A set of trailers must carry the END_STREAM flag. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame(self.example_request_headers) c.receive_data(f.serialize()) # Send headers. c.send_headers(1, self.example_response_headers) # Now send trailers. trailers = [("content-length", "0")] with pytest.raises(h2.exceptions.ProtocolError): c.send_headers(1, trailers) @pytest.mark.parametrize("frame_id", range(12, 256)) def test_unknown_frames_are_ignored(self, frame_factory, frame_id) -> None: c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() f = frame_factory.build_data_frame(data=b"abcdefghtdst") f.type = frame_id events = c.receive_data(f.serialize()) assert not c.data_to_send() assert len(events) == 1 assert isinstance(events[0], h2.events.UnknownFrameReceived) assert isinstance(events[0].frame, hyperframe.frame.ExtensionFrame) def test_can_send_goaway_repeatedly(self, frame_factory) -> None: """ We can send a GOAWAY frame as many times as we like. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() c.close_connection() c.close_connection() c.close_connection() f = frame_factory.build_goaway_frame(last_stream_id=0) assert c.data_to_send() == (f.serialize() * 3) def test_receiving_goaway_frame(self, frame_factory) -> None: """ Receiving a GOAWAY frame causes a ConnectionTerminated event to be fired and transitions the connection to the CLOSED state, and clears the outbound data buffer. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) f = frame_factory.build_goaway_frame( last_stream_id=5, error_code=h2.errors.ErrorCodes.SETTINGS_TIMEOUT, ) events = c.receive_data(f.serialize()) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.ConnectionTerminated) assert event.error_code == h2.errors.ErrorCodes.SETTINGS_TIMEOUT assert isinstance(event.error_code, h2.errors.ErrorCodes) assert event.last_stream_id == 5 assert event.additional_data is None assert c.state_machine.state == h2.connection.ConnectionState.CLOSED assert not c.data_to_send() def test_receiving_multiple_goaway_frames(self, frame_factory) -> None: """ Multiple GOAWAY frames can be received at once, and are allowed. Each one fires a ConnectionTerminated event. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() f = frame_factory.build_goaway_frame(last_stream_id=0) events = c.receive_data(f.serialize() * 3) assert len(events) == 3 assert all( isinstance(event, h2.events.ConnectionTerminated) for event in events ) def test_receiving_goaway_frame_with_additional_data(self, frame_factory) -> None: """ GOAWAY frame can contain additional data, it should be available via ConnectionTerminated event. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) additional_data = b"debug data" f = frame_factory.build_goaway_frame(last_stream_id=0, additional_data=additional_data) events = c.receive_data(f.serialize()) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.ConnectionTerminated) assert event.additional_data == additional_data def test_receiving_goaway_frame_with_unknown_error(self, frame_factory) -> None: """ Receiving a GOAWAY frame with an unknown error code behaves exactly the same as receiving one we know about, but the code is reported as an integer instead of as an ErrorCodes. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) f = frame_factory.build_goaway_frame( last_stream_id=5, error_code=0xFA, ) events = c.receive_data(f.serialize()) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.ConnectionTerminated) assert event.error_code == 250 assert not isinstance(event.error_code, h2.errors.ErrorCodes) assert event.last_stream_id == 5 assert event.additional_data is None assert c.state_machine.state == h2.connection.ConnectionState.CLOSED assert not c.data_to_send() def test_cookies_are_joined(self, frame_factory) -> None: """ RFC 7540 Section 8.1.2.5 requires that we join multiple Cookie headers in a header block together. """ # This is a moderately varied set of cookie headers: some combined, # some split. cookie_headers = [ ("cookie", "username=John Doe; expires=Thu, 18 Dec 2013 12:00:00 UTC"), ("cookie", "path=1"), ("cookie", "test1=val1; test2=val2"), ] expected = ( "username=John Doe; expires=Thu, 18 Dec 2013 12:00:00 UTC; " "path=1; test1=val1; test2=val2" ) c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame( self.example_request_headers + cookie_headers, ) events = c.receive_data(f.serialize()) assert len(events) == 1 e = events[0] cookie_fields = [(n, v) for n, v in e.headers if n == "cookie"] assert len(cookie_fields) == 1 _, v = cookie_fields[0] assert v == expected def test_cookies_arent_joined_without_normalization(self, frame_factory) -> None: """ If inbound header normalization is disabled, cookie headers aren't joined. """ # This is a moderately varied set of cookie headers: some combined, # some split. cookie_headers = [ ("cookie", "username=John Doe; expires=Thu, 18 Dec 2013 12:00:00 UTC"), ("cookie", "path=1"), ("cookie", "test1=val1; test2=val2"), ] config = h2.config.H2Configuration( client_side=False, normalize_inbound_headers=False, header_encoding="utf-8", ) c = h2.connection.H2Connection(config=config) c.initiate_connection() c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame( self.example_request_headers + cookie_headers, ) events = c.receive_data(f.serialize()) assert len(events) == 1 e = events[0] received_cookies = [(n, v) for n, v in e.headers if n == "cookie"] assert len(received_cookies) == 3 assert cookie_headers == received_cookies def test_stream_repr(self) -> None: """ Ensure stream string representation is appropriate. """ s = h2.stream.H2Stream(4, None, 12, 14) assert repr(s) == ">" def sanity_check_data_frame(data_frame, expected_flow_controlled_length, expect_padded_flag, expected_data_frame_pad_length) -> None: """ ``data_frame`` is a frame of type ``hyperframe.frame.DataFrame``, and the ``flags`` and ``flow_controlled_length`` of ``data_frame`` match expectations. """ assert isinstance(data_frame, hyperframe.frame.DataFrame) assert data_frame.flow_controlled_length == expected_flow_controlled_length if expect_padded_flag: assert "PADDED" in data_frame.flags else: assert "PADDED" not in data_frame.flags assert data_frame.pad_length == expected_data_frame_pad_length ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/test_closed_streams.py0000644000076500000240000004565414744265074017204 0ustar00kriechistaff""" Tests that we handle closed streams correctly. """ from __future__ import annotations import pytest import h2.config import h2.connection import h2.errors import h2.events import h2.exceptions class TestClosedStreams: example_request_headers = [ (":authority", "example.com"), (":path", "/"), (":scheme", "https"), (":method", "GET"), ] example_response_headers = [ (":status", "200"), ("server", "fake-serv/0.1.0"), ] server_config = h2.config.H2Configuration(client_side=False) def test_can_receive_multiple_rst_stream_frames(self, frame_factory) -> None: """ Multiple RST_STREAM frames can be received, either at once or well after one another. Only the first fires an event. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(1, self.example_request_headers, end_stream=True) f = frame_factory.build_rst_stream_frame(stream_id=1) events = c.receive_data(f.serialize() * 3) # Force an iteration over all the streams to remove them. c.open_outbound_streams # Receive more data. events += c.receive_data(f.serialize() * 3) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.StreamReset) def test_receiving_low_stream_id_causes_goaway(self, frame_factory) -> None: """ The remote peer creating a stream with a lower ID than one we've seen causes a GOAWAY frame. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) c.initiate_connection() f = frame_factory.build_headers_frame( self.example_request_headers, stream_id=3, ) c.receive_data(f.serialize()) c.clear_outbound_data_buffer() f = frame_factory.build_headers_frame( self.example_request_headers, stream_id=1, ) with pytest.raises(h2.exceptions.StreamIDTooLowError) as e: c.receive_data(f.serialize()) assert e.value.stream_id == 1 assert e.value.max_stream_id == 3 f = frame_factory.build_goaway_frame( last_stream_id=3, error_code=h2.errors.ErrorCodes.PROTOCOL_ERROR, ) assert c.data_to_send() == f.serialize() def test_closed_stream_not_present_in_streams_dict(self, frame_factory) -> None: """ When streams have been closed, they get removed from the streams dictionary the next time we count the open streams. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) c.initiate_connection() f = frame_factory.build_headers_frame(self.example_request_headers) c.receive_data(f.serialize()) c.push_stream(1, 2, self.example_request_headers) c.reset_stream(1) c.clear_outbound_data_buffer() f = frame_factory.build_rst_stream_frame(stream_id=2) c.receive_data(f.serialize()) # Force a count of the streams. assert not c.open_outbound_streams # The streams dictionary should be empty. assert not c.streams def test_receive_rst_stream_on_closed_stream(self, frame_factory) -> None: """ RST_STREAM frame should be ignored if stream is in a closed state. See RFC 7540 Section 5.1 (closed state) """ c = h2.connection.H2Connection() c.initiate_connection() # Client sends request c.send_headers(1, self.example_request_headers) # Some time passes and client sends DATA frame and closes stream, # so it is in a half-closed state c.send_data(1, b"some data", end_stream=True) # Server received HEADERS frame but DATA frame is still on the way. # Stream is in open state on the server-side. In this state server is # allowed to end stream and reset it - this trick helps immediately # close stream on the server-side. headers_frame = frame_factory.build_headers_frame( [(":status", "200")], flags=["END_STREAM"], stream_id=1, ) events = c.receive_data(headers_frame.serialize()) assert len(events) == 2 response_received, stream_ended = events assert isinstance(response_received, h2.events.ResponseReceived) assert isinstance(stream_ended, h2.events.StreamEnded) rst_stream_frame = frame_factory.build_rst_stream_frame(stream_id=1) events = c.receive_data(rst_stream_frame.serialize()) assert not events def test_receive_window_update_on_closed_stream(self, frame_factory) -> None: """ WINDOW_UPDATE frame should be ignored if stream is in a closed state. See RFC 7540 Section 5.1 (closed state) """ c = h2.connection.H2Connection() c.initiate_connection() # Client sends request c.send_headers(1, self.example_request_headers) # Some time passes and client sends DATA frame and closes stream, # so it is in a half-closed state c.send_data(1, b"some data", end_stream=True) # Server received HEADERS frame but DATA frame is still on the way. # Stream is in open state on the server-side. In this state server is # allowed to end stream and after that acknowledge received data by # sending WINDOW_UPDATE frames. headers_frame = frame_factory.build_headers_frame( [(":status", "200")], flags=["END_STREAM"], stream_id=1, ) events = c.receive_data(headers_frame.serialize()) assert len(events) == 2 response_received, stream_ended = events assert isinstance(response_received, h2.events.ResponseReceived) assert isinstance(stream_ended, h2.events.StreamEnded) window_update_frame = frame_factory.build_window_update_frame( stream_id=1, increment=1, ) events = c.receive_data(window_update_frame.serialize()) assert not events # Getting open_inbound_streams property will trigger stream accounting # which results in removing closed streams. c.open_inbound_streams # Another window_update_frame is received for stream 1 events = c.receive_data(window_update_frame.serialize()) assert not events class TestStreamsClosedByEndStream: example_request_headers = [ (":authority", "example.com"), (":path", "/"), (":scheme", "https"), (":method", "GET"), ] example_response_headers = [ (":status", "200"), ("server", "fake-serv/0.1.0"), ] server_config = h2.config.H2Configuration(client_side=False) @pytest.mark.parametrize( "frame", [ lambda self, ff: ff.build_headers_frame( self.example_request_headers, flags=["END_STREAM"]), lambda self, ff: ff.build_headers_frame( self.example_request_headers), ], ) @pytest.mark.parametrize("clear_streams", [True, False]) def test_frames_after_recv_end_will_error(self, frame_factory, frame, clear_streams) -> None: """ A stream that is closed by receiving END_STREAM raises ProtocolError when it receives an unexpected frame. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) c.initiate_connection() f = frame_factory.build_headers_frame( self.example_request_headers, flags=["END_STREAM"], ) c.receive_data(f.serialize()) c.send_headers( stream_id=1, headers=self.example_response_headers, end_stream=True, ) if clear_streams: # Call open_inbound_streams to force the connection to clean # closed streams. c.open_inbound_streams c.clear_outbound_data_buffer() f = frame(self, frame_factory) with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(f.serialize()) f = frame_factory.build_goaway_frame( last_stream_id=1, error_code=h2.errors.ErrorCodes.STREAM_CLOSED, ) assert c.data_to_send() == f.serialize() @pytest.mark.parametrize( "frame", [ lambda self, ff: ff.build_headers_frame( self.example_response_headers, flags=["END_STREAM"]), lambda self, ff: ff.build_headers_frame( self.example_response_headers), ], ) @pytest.mark.parametrize("clear_streams", [True, False]) def test_frames_after_send_end_will_error(self, frame_factory, frame, clear_streams) -> None: """ A stream that is closed by sending END_STREAM raises ProtocolError when it receives an unexpected frame. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=self.example_request_headers, end_stream=True) f = frame_factory.build_headers_frame( self.example_response_headers, flags=["END_STREAM"], ) c.receive_data(f.serialize()) if clear_streams: # Call open_outbound_streams to force the connection to clean # closed streams. c.open_outbound_streams c.clear_outbound_data_buffer() f = frame(self, frame_factory) with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(f.serialize()) f = frame_factory.build_goaway_frame( last_stream_id=0, error_code=h2.errors.ErrorCodes.STREAM_CLOSED, ) assert c.data_to_send() == f.serialize() @pytest.mark.parametrize( "frame", [ lambda self, ff: ff.build_window_update_frame(1, 1), lambda self, ff: ff.build_rst_stream_frame(1), ], ) def test_frames_after_send_end_will_be_ignored(self, frame_factory, frame) -> None: """ A stream that is closed by sending END_STREAM will raise ProtocolError when received unexpected frame. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) c.initiate_connection() f = frame_factory.build_headers_frame( self.example_request_headers, flags=["END_STREAM"], ) c.receive_data(f.serialize()) c.send_headers( stream_id=1, headers=self.example_response_headers, end_stream=True, ) c.clear_outbound_data_buffer() f = frame(self, frame_factory) events = c.receive_data(f.serialize()) assert not events class TestStreamsClosedByRstStream: example_request_headers = [ (":authority", "example.com"), (":path", "/"), (":scheme", "https"), (":method", "GET"), ] example_response_headers = [ (":status", "200"), ("server", "fake-serv/0.1.0"), ] server_config = h2.config.H2Configuration(client_side=False) @pytest.mark.parametrize( "frame", [ lambda self, ff: ff.build_headers_frame( self.example_request_headers), lambda self, ff: ff.build_headers_frame( self.example_request_headers, flags=["END_STREAM"]), ], ) def test_resets_further_frames_after_recv_reset(self, frame_factory, frame) -> None: """ A stream that is closed by receive RST_STREAM can receive further frames: it simply sends RST_STREAM for it, and additionally WINDOW_UPDATE for DATA frames. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) c.initiate_connection() header_frame = frame_factory.build_headers_frame( self.example_request_headers, flags=["END_STREAM"], ) c.receive_data(header_frame.serialize()) c.send_headers( stream_id=1, headers=self.example_response_headers, end_stream=False, ) rst_frame = frame_factory.build_rst_stream_frame( 1, h2.errors.ErrorCodes.STREAM_CLOSED, ) c.receive_data(rst_frame.serialize()) c.clear_outbound_data_buffer() f = frame(self, frame_factory) events = c.receive_data(f.serialize()) rst_frame = frame_factory.build_rst_stream_frame( 1, h2.errors.ErrorCodes.STREAM_CLOSED, ) assert not events assert c.data_to_send() == rst_frame.serialize() events = c.receive_data(f.serialize() * 3) assert not events assert c.data_to_send() == rst_frame.serialize() * 3 # Iterate over the streams to make sure it's gone, then confirm the # behaviour is unchanged. c.open_outbound_streams events = c.receive_data(f.serialize() * 3) assert not events assert c.data_to_send() == rst_frame.serialize() * 3 def test_resets_further_data_frames_after_recv_reset(self, frame_factory) -> None: """ A stream that is closed by receive RST_STREAM can receive further DATA frames: it simply sends WINDOW_UPDATE for the connection flow window, and RST_STREAM for the stream. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) c.initiate_connection() header_frame = frame_factory.build_headers_frame( self.example_request_headers, flags=["END_STREAM"], ) c.receive_data(header_frame.serialize()) c.send_headers( stream_id=1, headers=self.example_response_headers, end_stream=False, ) rst_frame = frame_factory.build_rst_stream_frame( 1, h2.errors.ErrorCodes.STREAM_CLOSED, ) c.receive_data(rst_frame.serialize()) c.clear_outbound_data_buffer() f = frame_factory.build_data_frame( data=b"some data", ) events = c.receive_data(f.serialize()) assert not events expected = frame_factory.build_rst_stream_frame( stream_id=1, error_code=h2.errors.ErrorCodes.STREAM_CLOSED, ).serialize() assert c.data_to_send() == expected events = c.receive_data(f.serialize() * 3) assert not events assert c.data_to_send() == expected * 3 # Iterate over the streams to make sure it's gone, then confirm the # behaviour is unchanged. c.open_outbound_streams events = c.receive_data(f.serialize() * 3) assert not events assert c.data_to_send() == expected * 3 @pytest.mark.parametrize( "frame", [ lambda self, ff: ff.build_headers_frame( self.example_request_headers), lambda self, ff: ff.build_headers_frame( self.example_request_headers, flags=["END_STREAM"]), ], ) def test_resets_further_frames_after_send_reset(self, frame_factory, frame) -> None: """ A stream that is closed by sent RST_STREAM can receive further frames: it simply sends RST_STREAM for it. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) c.initiate_connection() header_frame = frame_factory.build_headers_frame( self.example_request_headers, flags=["END_STREAM"], ) c.receive_data(header_frame.serialize()) c.send_headers( stream_id=1, headers=self.example_response_headers, end_stream=False, ) c.reset_stream(1, h2.errors.ErrorCodes.INTERNAL_ERROR) rst_frame = frame_factory.build_rst_stream_frame( 1, h2.errors.ErrorCodes.STREAM_CLOSED, ) c.clear_outbound_data_buffer() f = frame(self, frame_factory) events = c.receive_data(f.serialize()) rst_frame = frame_factory.build_rst_stream_frame( 1, h2.errors.ErrorCodes.STREAM_CLOSED, ) assert not events assert c.data_to_send() == rst_frame.serialize() events = c.receive_data(f.serialize() * 3) assert not events assert c.data_to_send() == rst_frame.serialize() * 3 # Iterate over the streams to make sure it's gone, then confirm the # behaviour is unchanged. c.open_outbound_streams events = c.receive_data(f.serialize() * 3) assert not events assert c.data_to_send() == rst_frame.serialize() * 3 def test_resets_further_data_frames_after_send_reset(self, frame_factory) -> None: """ A stream that is closed by sent RST_STREAM can receive further data frames: it simply sends WINDOW_UPDATE and RST_STREAM for it. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) c.initiate_connection() header_frame = frame_factory.build_headers_frame( self.example_request_headers, flags=["END_STREAM"], ) c.receive_data(header_frame.serialize()) c.send_headers( stream_id=1, headers=self.example_response_headers, end_stream=False, ) c.reset_stream(1, h2.errors.ErrorCodes.INTERNAL_ERROR) c.clear_outbound_data_buffer() f = frame_factory.build_data_frame( data=b"some data", ) events = c.receive_data(f.serialize()) assert not events expected = frame_factory.build_rst_stream_frame( stream_id=1, error_code=h2.errors.ErrorCodes.STREAM_CLOSED, ).serialize() assert c.data_to_send() == expected events = c.receive_data(f.serialize() * 3) assert not events assert c.data_to_send() == expected * 3 # Iterate over the streams to make sure it's gone, then confirm the # behaviour is unchanged. c.open_outbound_streams events = c.receive_data(f.serialize() * 3) assert not events assert c.data_to_send() == expected * 3 ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/test_complex_logic.py0000644000076500000240000005174514744265074017017 0ustar00kriechistaff""" More complex tests that try to do more. Certain tests don't really eliminate incorrect behaviour unless they do quite a bit. These tests should live here, to keep the pain in once place rather than hide it in the other parts of the test suite. """ from __future__ import annotations import pytest import h2 import h2.config import h2.connection class TestComplexClient: """ Complex tests for client-side stacks. """ example_request_headers = [ (":authority", "example.com"), (":path", "/"), (":scheme", "https"), (":method", "GET"), ] example_response_headers = [ (":status", "200"), ("server", "fake-serv/0.1.0"), ] def test_correctly_count_server_streams(self, frame_factory) -> None: """ We correctly count the number of server streams, both inbound and outbound. """ # This test makes no sense unless you do both inbound and outbound, # because it's important to confirm that we count them correctly. c = h2.connection.H2Connection() c.initiate_connection() expected_inbound_streams = expected_outbound_streams = 0 assert c.open_inbound_streams == expected_inbound_streams assert c.open_outbound_streams == expected_outbound_streams for stream_id in range(1, 15, 2): # Open an outbound stream c.send_headers(stream_id, self.example_request_headers) expected_outbound_streams += 1 assert c.open_inbound_streams == expected_inbound_streams assert c.open_outbound_streams == expected_outbound_streams # Receive a pushed stream (to create an inbound one). This doesn't # open until we also receive headers. f = frame_factory.build_push_promise_frame( stream_id=stream_id, promised_stream_id=stream_id+1, headers=self.example_request_headers, ) c.receive_data(f.serialize()) assert c.open_inbound_streams == expected_inbound_streams assert c.open_outbound_streams == expected_outbound_streams f = frame_factory.build_headers_frame( stream_id=stream_id+1, headers=self.example_response_headers, ) c.receive_data(f.serialize()) expected_inbound_streams += 1 assert c.open_inbound_streams == expected_inbound_streams assert c.open_outbound_streams == expected_outbound_streams for stream_id in range(13, 0, -2): # Close an outbound stream. c.end_stream(stream_id) # Stream doesn't close until both sides close it. assert c.open_inbound_streams == expected_inbound_streams assert c.open_outbound_streams == expected_outbound_streams f = frame_factory.build_headers_frame( stream_id=stream_id, headers=self.example_response_headers, flags=["END_STREAM"], ) c.receive_data(f.serialize()) expected_outbound_streams -= 1 assert c.open_inbound_streams == expected_inbound_streams assert c.open_outbound_streams == expected_outbound_streams # Pushed streams can only be closed remotely. f = frame_factory.build_data_frame( stream_id=stream_id+1, data=b"the content", flags=["END_STREAM"], ) c.receive_data(f.serialize()) expected_inbound_streams -= 1 assert c.open_inbound_streams == expected_inbound_streams assert c.open_outbound_streams == expected_outbound_streams assert c.open_inbound_streams == 0 assert c.open_outbound_streams == 0 class TestComplexServer: """ Complex tests for server-side stacks. """ example_request_headers = [ (b":authority", b"example.com"), (b":path", b"/"), (b":scheme", b"https"), (b":method", b"GET"), ] example_response_headers = [ (b":status", b"200"), (b"server", b"fake-serv/0.1.0"), ] server_config = h2.config.H2Configuration(client_side=False) def test_correctly_count_server_streams(self, frame_factory) -> None: """ We correctly count the number of server streams, both inbound and outbound. """ # This test makes no sense unless you do both inbound and outbound, # because it's important to confirm that we count them correctly. c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) expected_inbound_streams = expected_outbound_streams = 0 assert c.open_inbound_streams == expected_inbound_streams assert c.open_outbound_streams == expected_outbound_streams for stream_id in range(1, 15, 2): # Receive an inbound stream. f = frame_factory.build_headers_frame( headers=self.example_request_headers, stream_id=stream_id, ) c.receive_data(f.serialize()) expected_inbound_streams += 1 assert c.open_inbound_streams == expected_inbound_streams assert c.open_outbound_streams == expected_outbound_streams # Push a stream (to create a outbound one). This doesn't open # until we send our response headers. c.push_stream(stream_id, stream_id+1, self.example_request_headers) assert c.open_inbound_streams == expected_inbound_streams assert c.open_outbound_streams == expected_outbound_streams c.send_headers(stream_id+1, self.example_response_headers) expected_outbound_streams += 1 assert c.open_inbound_streams == expected_inbound_streams assert c.open_outbound_streams == expected_outbound_streams for stream_id in range(13, 0, -2): # Close an inbound stream. f = frame_factory.build_data_frame( data=b"", flags=["END_STREAM"], stream_id=stream_id, ) c.receive_data(f.serialize()) # Stream doesn't close until both sides close it. assert c.open_inbound_streams == expected_inbound_streams assert c.open_outbound_streams == expected_outbound_streams c.send_data(stream_id, b"", end_stream=True) expected_inbound_streams -= 1 assert c.open_inbound_streams == expected_inbound_streams assert c.open_outbound_streams == expected_outbound_streams # Pushed streams, however, we can close ourselves. c.send_data( stream_id=stream_id+1, data=b"", end_stream=True, ) expected_outbound_streams -= 1 assert c.open_inbound_streams == expected_inbound_streams assert c.open_outbound_streams == expected_outbound_streams assert c.open_inbound_streams == 0 assert c.open_outbound_streams == 0 class TestContinuationFrames: """ Tests for the relatively complex CONTINUATION frame logic. """ example_request_headers = [ (b":authority", b"example.com"), (b":path", b"/"), (b":scheme", b"https"), (b":method", b"GET"), ] server_config = h2.config.H2Configuration(client_side=False) def _build_continuation_sequence(self, headers, block_size, frame_factory): f = frame_factory.build_headers_frame(headers) header_data = f.data chunks = [ header_data[x:x+block_size] for x in range(0, len(header_data), block_size) ] f.data = chunks.pop(0) frames = [ frame_factory.build_continuation_frame(c) for c in chunks ] f.flags = {"END_STREAM"} frames[-1].flags.add("END_HEADERS") frames.insert(0, f) return frames def test_continuation_frame_basic(self, frame_factory) -> None: """ Test that we correctly decode a header block split across continuation frames. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) frames = self._build_continuation_sequence( headers=self.example_request_headers, block_size=5, frame_factory=frame_factory, ) data = b"".join(f.serialize() for f in frames) events = c.receive_data(data) assert len(events) == 2 first_event, second_event = events assert isinstance(first_event, h2.events.RequestReceived) assert first_event.headers == self.example_request_headers assert first_event.stream_id == 1 assert isinstance(second_event, h2.events.StreamEnded) assert second_event.stream_id == 1 @pytest.mark.parametrize("stream_id", [3, 1]) def test_continuation_cannot_interleave_headers(self, frame_factory, stream_id) -> None: """ We cannot interleave a new headers block with a CONTINUATION sequence. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() frames = self._build_continuation_sequence( headers=self.example_request_headers, block_size=5, frame_factory=frame_factory, ) assert len(frames) > 2 # This is mostly defensive. bogus_frame = frame_factory.build_headers_frame( headers=self.example_request_headers, stream_id=stream_id, flags=["END_STREAM"], ) frames.insert(len(frames) - 2, bogus_frame) data = b"".join(f.serialize() for f in frames) with pytest.raises(h2.exceptions.ProtocolError) as e: c.receive_data(data) assert "invalid frame" in str(e.value).lower() def test_continuation_cannot_interleave_data(self, frame_factory) -> None: """ We cannot interleave a data frame with a CONTINUATION sequence. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() frames = self._build_continuation_sequence( headers=self.example_request_headers, block_size=5, frame_factory=frame_factory, ) assert len(frames) > 2 # This is mostly defensive. bogus_frame = frame_factory.build_data_frame( data=b"hello", stream_id=1, ) frames.insert(len(frames) - 2, bogus_frame) data = b"".join(f.serialize() for f in frames) with pytest.raises(h2.exceptions.ProtocolError) as e: c.receive_data(data) assert "invalid frame" in str(e.value).lower() def test_continuation_cannot_interleave_unknown_frame(self, frame_factory) -> None: """ We cannot interleave an unknown frame with a CONTINUATION sequence. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() frames = self._build_continuation_sequence( headers=self.example_request_headers, block_size=5, frame_factory=frame_factory, ) assert len(frames) > 2 # This is mostly defensive. bogus_frame = frame_factory.build_data_frame( data=b"hello", stream_id=1, ) bogus_frame.type = 88 frames.insert(len(frames) - 2, bogus_frame) data = b"".join(f.serialize() for f in frames) with pytest.raises(h2.exceptions.ProtocolError) as e: c.receive_data(data) assert "invalid frame" in str(e.value).lower() def test_continuation_frame_multiple_blocks(self, frame_factory) -> None: """ Test that we correctly decode several header blocks split across continuation frames. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) for stream_id in range(1, 7, 2): frames = self._build_continuation_sequence( headers=self.example_request_headers, block_size=2, frame_factory=frame_factory, ) for frame in frames: frame.stream_id = stream_id data = b"".join(f.serialize() for f in frames) events = c.receive_data(data) assert len(events) == 2 first_event, second_event = events assert isinstance(first_event, h2.events.RequestReceived) assert first_event.headers == self.example_request_headers assert first_event.stream_id == stream_id assert isinstance(second_event, h2.events.StreamEnded) assert second_event.stream_id == stream_id class TestContinuationFramesPushPromise: """ Tests for the relatively complex CONTINUATION frame logic working with PUSH_PROMISE frames. """ example_request_headers = [ (b":authority", b"example.com"), (b":path", b"/"), (b":scheme", b"https"), (b":method", b"GET"), ] example_response_headers = [ (b":status", b"200"), (b"server", b"fake-serv/0.1.0"), ] def _build_continuation_sequence(self, headers, block_size, frame_factory): f = frame_factory.build_push_promise_frame( stream_id=1, promised_stream_id=2, headers=headers, ) header_data = f.data chunks = [ header_data[x:x+block_size] for x in range(0, len(header_data), block_size) ] f.data = chunks.pop(0) frames = [ frame_factory.build_continuation_frame(c) for c in chunks ] f.flags = {"END_STREAM"} frames[-1].flags.add("END_HEADERS") frames.insert(0, f) return frames def test_continuation_frame_basic_push_promise(self, frame_factory) -> None: """ Test that we correctly decode a header block split across continuation frames when that header block is initiated with a PUSH_PROMISE. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=self.example_request_headers) frames = self._build_continuation_sequence( headers=self.example_request_headers, block_size=5, frame_factory=frame_factory, ) data = b"".join(f.serialize() for f in frames) events = c.receive_data(data) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.PushedStreamReceived) assert event.headers == self.example_request_headers assert event.parent_stream_id == 1 assert event.pushed_stream_id == 2 @pytest.mark.parametrize("stream_id", [3, 1, 2]) def test_continuation_cannot_interleave_headers_pp(self, frame_factory, stream_id) -> None: """ We cannot interleave a new headers block with a CONTINUATION sequence when the headers block is based on a PUSH_PROMISE frame. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=self.example_request_headers) frames = self._build_continuation_sequence( headers=self.example_request_headers, block_size=5, frame_factory=frame_factory, ) assert len(frames) > 2 # This is mostly defensive. bogus_frame = frame_factory.build_headers_frame( headers=self.example_response_headers, stream_id=stream_id, flags=["END_STREAM"], ) frames.insert(len(frames) - 2, bogus_frame) data = b"".join(f.serialize() for f in frames) with pytest.raises(h2.exceptions.ProtocolError) as e: c.receive_data(data) assert "invalid frame" in str(e.value).lower() def test_continuation_cannot_interleave_data(self, frame_factory) -> None: """ We cannot interleave a data frame with a CONTINUATION sequence when that sequence began with a PUSH_PROMISE frame. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=self.example_request_headers) frames = self._build_continuation_sequence( headers=self.example_request_headers, block_size=5, frame_factory=frame_factory, ) assert len(frames) > 2 # This is mostly defensive. bogus_frame = frame_factory.build_data_frame( data=b"hello", stream_id=1, ) frames.insert(len(frames) - 2, bogus_frame) data = b"".join(f.serialize() for f in frames) with pytest.raises(h2.exceptions.ProtocolError) as e: c.receive_data(data) assert "invalid frame" in str(e.value).lower() def test_continuation_cannot_interleave_unknown_frame(self, frame_factory) -> None: """ We cannot interleave an unknown frame with a CONTINUATION sequence when that sequence began with a PUSH_PROMISE frame. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=self.example_request_headers) frames = self._build_continuation_sequence( headers=self.example_request_headers, block_size=5, frame_factory=frame_factory, ) assert len(frames) > 2 # This is mostly defensive. bogus_frame = frame_factory.build_data_frame( data=b"hello", stream_id=1, ) bogus_frame.type = 88 frames.insert(len(frames) - 2, bogus_frame) data = b"".join(f.serialize() for f in frames) with pytest.raises(h2.exceptions.ProtocolError) as e: c.receive_data(data) assert "invalid frame" in str(e.value).lower() @pytest.mark.parametrize("evict", [True, False]) def test_stream_remotely_closed_disallows_push_promise(self, evict, frame_factory) -> None: """ Streams closed normally by the remote peer disallow PUSH_PROMISE frames, and cause a GOAWAY. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers( stream_id=1, headers=self.example_request_headers, end_stream=True, ) f = frame_factory.build_headers_frame( stream_id=1, headers=self.example_response_headers, flags=["END_STREAM"], ) c.receive_data(f.serialize()) c.clear_outbound_data_buffer() if evict: # This is annoyingly stateful, but enumerating the list of open # streams will force us to flush state. assert not c.open_outbound_streams f = frame_factory.build_push_promise_frame( stream_id=1, promised_stream_id=2, headers=self.example_request_headers, ) with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(f.serialize()) f = frame_factory.build_goaway_frame( last_stream_id=0, error_code=h2.errors.ErrorCodes.PROTOCOL_ERROR, ) assert c.data_to_send() == f.serialize() def test_continuation_frame_multiple_push_promise(self, frame_factory) -> None: """ Test that we correctly decode header blocks split across continuation frames when those header block is initiated with a PUSH_PROMISE, for more than one pushed stream. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=self.example_request_headers) for promised_stream_id in range(2, 8, 2): frames = self._build_continuation_sequence( headers=self.example_request_headers, block_size=2, frame_factory=frame_factory, ) frames[0].promised_stream_id = promised_stream_id data = b"".join(f.serialize() for f in frames) events = c.receive_data(data) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.PushedStreamReceived) assert event.headers == self.example_request_headers assert event.parent_stream_id == 1 assert event.pushed_stream_id == promised_stream_id ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/test_config.py0000644000076500000240000001236014744265074015426 0ustar00kriechistaff""" Test the configuration object. """ from __future__ import annotations import logging import pytest import h2.config class TestH2Config: """ Tests of the H2 config object. """ def test_defaults(self) -> None: """ The default values of the HTTP/2 config object are sensible. """ config = h2.config.H2Configuration() assert config.client_side assert config.header_encoding is None assert isinstance(config.logger, h2.config.DummyLogger) boolean_config_options = [ "client_side", "validate_outbound_headers", "normalize_outbound_headers", "validate_inbound_headers", "normalize_inbound_headers", ] @pytest.mark.parametrize("option_name", boolean_config_options) @pytest.mark.parametrize("value", [None, "False", 1]) def test_boolean_config_options_reject_non_bools_init( self, option_name, value, ) -> None: """ The boolean config options raise an error if you try to set a value that isn't a boolean via the initializer. """ with pytest.raises(ValueError): h2.config.H2Configuration(**{option_name: value}) @pytest.mark.parametrize("option_name", boolean_config_options) @pytest.mark.parametrize("value", [None, "False", 1]) def test_boolean_config_options_reject_non_bools_attr( self, option_name, value, ) -> None: """ The boolean config options raise an error if you try to set a value that isn't a boolean via attribute setter. """ config = h2.config.H2Configuration() with pytest.raises(ValueError): setattr(config, option_name, value) @pytest.mark.parametrize("option_name", boolean_config_options) @pytest.mark.parametrize("value", [True, False]) def test_boolean_config_option_is_reflected_init(self, option_name, value) -> None: """ The value of the boolean config options, when set, is reflected in the value via the initializer. """ config = h2.config.H2Configuration(**{option_name: value}) assert getattr(config, option_name) == value @pytest.mark.parametrize("option_name", boolean_config_options) @pytest.mark.parametrize("value", [True, False]) def test_boolean_config_option_is_reflected_attr(self, option_name, value) -> None: """ The value of the boolean config options, when set, is reflected in the value via attribute setter. """ config = h2.config.H2Configuration() setattr(config, option_name, value) assert getattr(config, option_name) == value @pytest.mark.parametrize("header_encoding", [True, 1, object()]) def test_header_encoding_must_be_false_str_none_init( self, header_encoding, ) -> None: """ The value of the ``header_encoding`` setting must be False, a string, or None via the initializer. """ with pytest.raises(ValueError): h2.config.H2Configuration(header_encoding=header_encoding) @pytest.mark.parametrize("header_encoding", [True, 1, object()]) def test_header_encoding_must_be_false_str_none_attr( self, header_encoding, ) -> None: """ The value of the ``header_encoding`` setting must be False, a string, or None via attribute setter. """ config = h2.config.H2Configuration() with pytest.raises(ValueError): config.header_encoding = header_encoding @pytest.mark.parametrize("header_encoding", [False, "ascii", None]) def test_header_encoding_is_reflected_init(self, header_encoding) -> None: """ The value of ``header_encoding``, when set, is reflected in the value via the initializer. """ config = h2.config.H2Configuration(header_encoding=header_encoding) assert config.header_encoding == header_encoding @pytest.mark.parametrize("header_encoding", [False, "ascii", None]) def test_header_encoding_is_reflected_attr(self, header_encoding) -> None: """ The value of ``header_encoding``, when set, is reflected in the value via the attribute setter. """ config = h2.config.H2Configuration() config.header_encoding = header_encoding assert config.header_encoding == header_encoding def test_logger_instance_is_reflected(self) -> None: """ The value of ``logger``, when set, is reflected in the value. """ logger = logging.getLogger("hyper-h2.test") config = h2.config.H2Configuration() config.logger = logger assert config.logger is logger @pytest.mark.parametrize("trace_level", [False, True]) def test_output_logger(self, capsys, trace_level) -> None: logger = h2.config.OutputLogger(trace_level=trace_level) logger.debug("This is a debug message %d.", 123) logger.trace("This is a trace message %d.", 123) captured = capsys.readouterr() assert "h2 (debug): This is a debug message 123.\n" in captured.err if trace_level: assert "h2 (trace): This is a trace message 123.\n" in captured.err else: assert "h2 (trace): This is a trace message 123.\n" not in captured.err ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/test_events.py0000644000076500000240000003115614744265074015471 0ustar00kriechistaff""" Specific tests for any function that is logically self-contained as part of events.py. """ from __future__ import annotations import inspect import sys import pytest from hypothesis import given from hypothesis.strategies import integers, lists, tuples import h2.errors import h2.events import h2.settings # We define a fairly complex Hypothesis strategy here. We want to build a list # of two tuples of (Setting, value). For Setting we want to make sure we can # handle settings that the rest of hyper knows nothing about, so we want to # use integers from 0 to (2**16-1). For values, they're from 0 to (2**32-1). # Define that strategy here for clarity. SETTINGS_STRATEGY = lists( tuples( integers(min_value=0, max_value=2**16-1), integers(min_value=0, max_value=2**32-1), ), ) class TestRemoteSettingsChanged: """ Validate the function of the RemoteSettingsChanged event. """ @given(SETTINGS_STRATEGY) def test_building_settings_from_scratch(self, settings_list) -> None: """ Missing old settings are defaulted to None. """ settings_dict = dict(settings_list) e = h2.events.RemoteSettingsChanged.from_settings( old_settings={}, new_settings=settings_dict, ) for setting, new_value in settings_dict.items(): assert e.changed_settings[setting].setting == setting assert e.changed_settings[setting].original_value is None assert e.changed_settings[setting].new_value == new_value @given(SETTINGS_STRATEGY, SETTINGS_STRATEGY) def test_only_reports_changed_settings(self, old_settings_list, new_settings_list) -> None: """ Settings that were not changed are not reported. """ old_settings_dict = dict(old_settings_list) new_settings_dict = dict(new_settings_list) e = h2.events.RemoteSettingsChanged.from_settings( old_settings=old_settings_dict, new_settings=new_settings_dict, ) assert len(e.changed_settings) == len(new_settings_dict) assert ( sorted(e.changed_settings.keys()) == sorted(new_settings_dict.keys()) ) @given(SETTINGS_STRATEGY, SETTINGS_STRATEGY) def test_correctly_reports_changed_settings(self, old_settings_list, new_settings_list) -> None: """ Settings that are changed are correctly reported. """ old_settings_dict = dict(old_settings_list) new_settings_dict = dict(new_settings_list) e = h2.events.RemoteSettingsChanged.from_settings( old_settings=old_settings_dict, new_settings=new_settings_dict, ) for setting, new_value in new_settings_dict.items(): original_value = old_settings_dict.get(setting) assert e.changed_settings[setting].setting == setting assert e.changed_settings[setting].original_value == original_value assert e.changed_settings[setting].new_value == new_value class TestEventReprs: """ Events have useful representations. """ example_request_headers = [ (":authority", "example.com"), (":path", "/"), (":scheme", "https"), (":method", "GET"), ] example_informational_headers = [ (":status", "100"), ("server", "fake-serv/0.1.0"), ] example_response_headers = [ (":status", "200"), ("server", "fake-serv/0.1.0"), ] def test_requestreceived_repr(self) -> None: """ RequestReceived has a useful debug representation. """ e = h2.events.RequestReceived() e.stream_id = 5 e.headers = self.example_request_headers assert repr(e) == ( "" ) def test_responsereceived_repr(self) -> None: """ ResponseReceived has a useful debug representation. """ e = h2.events.ResponseReceived() e.stream_id = 500 e.headers = self.example_response_headers assert repr(e) == ( "" ) def test_trailersreceived_repr(self) -> None: """ TrailersReceived has a useful debug representation. """ e = h2.events.TrailersReceived() e.stream_id = 62 e.headers = self.example_response_headers assert repr(e) == ( "" ) def test_informationalresponsereceived_repr(self) -> None: """ InformationalResponseReceived has a useful debug representation. """ e = h2.events.InformationalResponseReceived() e.stream_id = 62 e.headers = self.example_informational_headers assert repr(e) == ( "" ) def test_datareceived_repr(self) -> None: """ DataReceived has a useful debug representation. """ e = h2.events.DataReceived() e.stream_id = 888 e.data = b"abcdefghijklmnopqrstuvwxyz" e.flow_controlled_length = 88 assert repr(e) == ( "" ) def test_windowupdated_repr(self) -> None: """ WindowUpdated has a useful debug representation. """ e = h2.events.WindowUpdated() e.stream_id = 0 e.delta = 2**16 assert repr(e) == "" def test_remotesettingschanged_repr(self) -> None: """ RemoteSettingsChanged has a useful debug representation. """ e = h2.events.RemoteSettingsChanged() e.changed_settings = { h2.settings.SettingCodes.INITIAL_WINDOW_SIZE: h2.settings.ChangedSetting( h2.settings.SettingCodes.INITIAL_WINDOW_SIZE, 2**16, 2**15, ), } if sys.version_info >= (3, 11): assert repr(e) == ( "" ) else: assert repr(e) == ( "" ) def test_pingreceived_repr(self) -> None: """ PingReceived has a useful debug representation. """ e = h2.events.PingReceived() e.ping_data = b"abcdefgh" assert repr(e) == "" def test_pingackreceived_repr(self) -> None: """ PingAckReceived has a useful debug representation. """ e = h2.events.PingAckReceived() e.ping_data = b"abcdefgh" assert repr(e) == "" def test_streamended_repr(self) -> None: """ StreamEnded has a useful debug representation. """ e = h2.events.StreamEnded() e.stream_id = 99 assert repr(e) == "" def test_streamreset_repr(self) -> None: """ StreamEnded has a useful debug representation. """ e = h2.events.StreamReset() e.stream_id = 919 e.error_code = h2.errors.ErrorCodes.ENHANCE_YOUR_CALM e.remote_reset = False if sys.version_info >= (3, 11): assert repr(e) == ( "" ) else: assert repr(e) == ( "" ) def test_pushedstreamreceived_repr(self) -> None: """ PushedStreamReceived has a useful debug representation. """ e = h2.events.PushedStreamReceived() e.pushed_stream_id = 50 e.parent_stream_id = 11 e.headers = self.example_request_headers assert repr(e) == ( "" ) def test_settingsacknowledged_repr(self) -> None: """ SettingsAcknowledged has a useful debug representation. """ e = h2.events.SettingsAcknowledged() e.changed_settings = { h2.settings.SettingCodes.INITIAL_WINDOW_SIZE: h2.settings.ChangedSetting( h2.settings.SettingCodes.INITIAL_WINDOW_SIZE, 2**16, 2**15, ), } if sys.version_info >= (3, 11): assert repr(e) == ( "" ) else: assert repr(e) == ( "" ) def test_priorityupdated_repr(self) -> None: """ PriorityUpdated has a useful debug representation. """ e = h2.events.PriorityUpdated() e.stream_id = 87 e.weight = 32 e.depends_on = 8 e.exclusive = True assert repr(e) == ( "" ) @pytest.mark.parametrize(("additional_data", "data_repr"), [ (None, "None"), (b"some data", "736f6d652064617461"), ]) def test_connectionterminated_repr(self, additional_data, data_repr) -> None: """ ConnectionTerminated has a useful debug representation. """ e = h2.events.ConnectionTerminated() e.error_code = h2.errors.ErrorCodes.INADEQUATE_SECURITY e.last_stream_id = 33 e.additional_data = additional_data if sys.version_info >= (3, 11): assert repr(e) == ( "" ) else: assert repr(e) == ( "" ) def test_alternativeserviceavailable_repr(self) -> None: """ AlternativeServiceAvailable has a useful debug representation. """ e = h2.events.AlternativeServiceAvailable() e.origin = b"example.com" e.field_value = b'h2=":8000"; ma=60' assert repr(e) == ( '' ) def test_unknownframereceived_repr(self) -> None: """ UnknownFrameReceived has a useful debug representation. """ e = h2.events.UnknownFrameReceived() assert repr(e) == "" def all_events(): """ Generates all the classes (i.e., events) defined in h2.events. """ for _, obj in inspect.getmembers(sys.modules["h2.events"]): # We are only interested in objects that are defined in h2.events; # objects that are imported from other modules are not of interest. if hasattr(obj, "__module__") and (obj.__module__ != "h2.events"): continue if inspect.isclass(obj): yield obj @pytest.mark.parametrize("event", all_events()) def test_all_events_subclass_from_event(event) -> None: """ Every event defined in h2.events subclasses from h2.events.Event. """ assert (event is h2.events.Event) or issubclass(event, h2.events.Event) ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/test_exceptions.py0000644000076500000240000000047514744265074016346 0ustar00kriechistaff""" Tests that verify logic local to exceptions. """ from __future__ import annotations import h2.exceptions class TestExceptions: def test_stream_id_too_low_prints_properly(self) -> None: x = h2.exceptions.StreamIDTooLowError(5, 10) assert str(x) == "StreamIDTooLowError: 5 is lower than 10" ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/test_flow_control_window.py0000644000076500000240000010623714744265074020266 0ustar00kriechistaff""" test_flow_control ~~~~~~~~~~~~~~~~~ Tests of the flow control management in h2 """ from __future__ import annotations import pytest from hypothesis import HealthCheck, given, settings from hypothesis.strategies import integers import h2.config import h2.connection import h2.errors import h2.events import h2.exceptions import h2.settings class TestFlowControl: """ Tests of the flow control management in the connection objects. """ example_request_headers = [ (":authority", "example.com"), (":path", "/"), (":scheme", "https"), (":method", "GET"), ] server_config = h2.config.H2Configuration(client_side=False) DEFAULT_FLOW_WINDOW = 65535 def test_flow_control_initializes_properly(self) -> None: """ The flow control window for a stream should initially be the default flow control value. """ c = h2.connection.H2Connection() c.send_headers(1, self.example_request_headers) assert c.local_flow_control_window(1) == self.DEFAULT_FLOW_WINDOW assert c.remote_flow_control_window(1) == self.DEFAULT_FLOW_WINDOW def test_flow_control_decreases_with_sent_data(self) -> None: """ When data is sent on a stream, the flow control window should drop. """ c = h2.connection.H2Connection() c.send_headers(1, self.example_request_headers) c.send_data(1, b"some data") remaining_length = self.DEFAULT_FLOW_WINDOW - len(b"some data") assert (c.local_flow_control_window(1) == remaining_length) @pytest.mark.parametrize("pad_length", [5, 0]) def test_flow_control_decreases_with_sent_data_with_padding(self, pad_length) -> None: """ When padded data is sent on a stream, the flow control window drops by the length of the padding plus 1 for the 1-byte padding length field. """ c = h2.connection.H2Connection() c.send_headers(1, self.example_request_headers) c.send_data(1, b"some data", pad_length=pad_length) remaining_length = ( self.DEFAULT_FLOW_WINDOW - len(b"some data") - pad_length - 1 ) assert c.local_flow_control_window(1) == remaining_length def test_flow_control_decreases_with_received_data(self, frame_factory) -> None: """ When data is received on a stream, the remote flow control window should drop. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) f1 = frame_factory.build_headers_frame(self.example_request_headers) f2 = frame_factory.build_data_frame(b"some data") c.receive_data(f1.serialize() + f2.serialize()) remaining_length = self.DEFAULT_FLOW_WINDOW - len(b"some data") assert (c.remote_flow_control_window(1) == remaining_length) def test_flow_control_decreases_with_padded_data(self, frame_factory) -> None: """ When padded data is received on a stream, the remote flow control window drops by an amount that includes the padding. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) f1 = frame_factory.build_headers_frame(self.example_request_headers) f2 = frame_factory.build_data_frame(b"some data", padding_len=10) c.receive_data(f1.serialize() + f2.serialize()) remaining_length = ( self.DEFAULT_FLOW_WINDOW - len(b"some data") - 10 - 1 ) assert (c.remote_flow_control_window(1) == remaining_length) def test_flow_control_is_limited_by_connection(self) -> None: """ The flow control window is limited by the flow control of the connection. """ c = h2.connection.H2Connection() c.send_headers(1, self.example_request_headers) c.send_data(1, b"some data") c.send_headers(3, self.example_request_headers) remaining_length = self.DEFAULT_FLOW_WINDOW - len(b"some data") assert (c.local_flow_control_window(3) == remaining_length) def test_remote_flow_control_is_limited_by_connection(self, frame_factory) -> None: """ The remote flow control window is limited by the flow control of the connection. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) f1 = frame_factory.build_headers_frame(self.example_request_headers) f2 = frame_factory.build_data_frame(b"some data") f3 = frame_factory.build_headers_frame( self.example_request_headers, stream_id=3, ) c.receive_data(f1.serialize() + f2.serialize() + f3.serialize()) remaining_length = self.DEFAULT_FLOW_WINDOW - len(b"some data") assert (c.remote_flow_control_window(3) == remaining_length) def test_cannot_send_more_data_than_window(self) -> None: """ Sending more data than the remaining flow control window raises a FlowControlError. """ c = h2.connection.H2Connection() c.send_headers(1, self.example_request_headers) c.outbound_flow_control_window = 5 with pytest.raises(h2.exceptions.FlowControlError): c.send_data(1, b"some data") def test_increasing_connection_window_allows_sending(self, frame_factory) -> None: """ Confirm that sending a WindowUpdate frame on the connection frees up space for further frames. """ c = h2.connection.H2Connection() c.send_headers(1, self.example_request_headers) c.outbound_flow_control_window = 5 with pytest.raises(h2.exceptions.FlowControlError): c.send_data(1, b"some data") f = frame_factory.build_window_update_frame( stream_id=0, increment=5, ) c.receive_data(f.serialize()) c.clear_outbound_data_buffer() c.send_data(1, b"some data") assert c.data_to_send() def test_increasing_stream_window_allows_sending(self, frame_factory) -> None: """ Confirm that sending a WindowUpdate frame on the connection frees up space for further frames. """ c = h2.connection.H2Connection() c.send_headers(1, self.example_request_headers) c._get_stream_by_id(1).outbound_flow_control_window = 5 with pytest.raises(h2.exceptions.FlowControlError): c.send_data(1, b"some data") f = frame_factory.build_window_update_frame( stream_id=1, increment=5, ) c.receive_data(f.serialize()) c.clear_outbound_data_buffer() c.send_data(1, b"some data") assert c.data_to_send() def test_flow_control_shrinks_in_response_to_settings(self, frame_factory) -> None: """ Acknowledging SETTINGS_INITIAL_WINDOW_SIZE shrinks the flow control window. """ c = h2.connection.H2Connection() c.send_headers(1, self.example_request_headers) assert c.local_flow_control_window(1) == 65535 f = frame_factory.build_settings_frame( settings={h2.settings.SettingCodes.INITIAL_WINDOW_SIZE: 1280}, ) c.receive_data(f.serialize()) assert c.local_flow_control_window(1) == 1280 def test_flow_control_grows_in_response_to_settings(self, frame_factory) -> None: """ Acknowledging SETTINGS_INITIAL_WINDOW_SIZE grows the flow control window. """ c = h2.connection.H2Connection() c.send_headers(1, self.example_request_headers) # Greatly increase the connection flow control window. f = frame_factory.build_window_update_frame( stream_id=0, increment=128000, ) c.receive_data(f.serialize()) # The stream flow control window is the bottleneck here. assert c.local_flow_control_window(1) == 65535 f = frame_factory.build_settings_frame( settings={h2.settings.SettingCodes.INITIAL_WINDOW_SIZE: 128000}, ) c.receive_data(f.serialize()) # The stream window is still the bottleneck, but larger now. assert c.local_flow_control_window(1) == 128000 def test_flow_control_settings_blocked_by_conn_window(self, frame_factory) -> None: """ Changing SETTINGS_INITIAL_WINDOW_SIZE does not affect the effective flow control window if the connection window isn't changed. """ c = h2.connection.H2Connection() c.send_headers(1, self.example_request_headers) assert c.local_flow_control_window(1) == 65535 f = frame_factory.build_settings_frame( settings={h2.settings.SettingCodes.INITIAL_WINDOW_SIZE: 128000}, ) c.receive_data(f.serialize()) assert c.local_flow_control_window(1) == 65535 def test_new_streams_have_flow_control_per_settings(self, frame_factory) -> None: """ After a SETTINGS_INITIAL_WINDOW_SIZE change is received, new streams have appropriate new flow control windows. """ c = h2.connection.H2Connection() f = frame_factory.build_settings_frame( settings={h2.settings.SettingCodes.INITIAL_WINDOW_SIZE: 128000}, ) c.receive_data(f.serialize()) # Greatly increase the connection flow control window. f = frame_factory.build_window_update_frame( stream_id=0, increment=128000, ) c.receive_data(f.serialize()) c.send_headers(1, self.example_request_headers) assert c.local_flow_control_window(1) == 128000 def test_window_update_no_stream(self, frame_factory) -> None: """ WindowUpdate frames received without streams fire an appropriate WindowUpdated event. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) f = frame_factory.build_window_update_frame( stream_id=0, increment=5, ) events = c.receive_data(f.serialize()) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.WindowUpdated) assert event.stream_id == 0 assert event.delta == 5 def test_window_update_with_stream(self, frame_factory) -> None: """ WindowUpdate frames received with streams fire an appropriate WindowUpdated event. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) f1 = frame_factory.build_headers_frame(self.example_request_headers) f2 = frame_factory.build_window_update_frame( stream_id=1, increment=66, ) data = b"".join(f.serialize() for f in [f1, f2]) events = c.receive_data(data) assert len(events) == 2 event = events[1] assert isinstance(event, h2.events.WindowUpdated) assert event.stream_id == 1 assert event.delta == 66 def test_we_can_increment_stream_flow_control(self, frame_factory) -> None: """ It is possible for the user to increase the flow control window for streams. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(1, self.example_request_headers, end_stream=True) c.clear_outbound_data_buffer() expected_frame = frame_factory.build_window_update_frame( stream_id=1, increment=5, ) events = c.increment_flow_control_window(increment=5, stream_id=1) assert not events assert c.data_to_send() == expected_frame.serialize() def test_we_can_increment_connection_flow_control(self, frame_factory) -> None: """ It is possible for the user to increase the flow control window for the entire connection. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(1, self.example_request_headers, end_stream=True) c.clear_outbound_data_buffer() expected_frame = frame_factory.build_window_update_frame( stream_id=0, increment=5, ) events = c.increment_flow_control_window(increment=5) assert not events assert c.data_to_send() == expected_frame.serialize() def test_we_enforce_our_flow_control_window(self, frame_factory) -> None: """ The user can set a low flow control window, which leads to connection teardown if violated. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) # Change the flow control window to 80 bytes. c.update_settings( {h2.settings.SettingCodes.INITIAL_WINDOW_SIZE: 80}, ) f = frame_factory.build_settings_frame({}, ack=True) c.receive_data(f.serialize()) # Receive a new stream. f = frame_factory.build_headers_frame(self.example_request_headers) c.receive_data(f.serialize()) # Attempt to violate the flow control window. c.clear_outbound_data_buffer() f = frame_factory.build_data_frame(b"\x01" * 100) with pytest.raises(h2.exceptions.FlowControlError): c.receive_data(f.serialize()) # Verify we tear down appropriately. expected_frame = frame_factory.build_goaway_frame( last_stream_id=1, error_code=h2.errors.ErrorCodes.FLOW_CONTROL_ERROR, ) assert c.data_to_send() == expected_frame.serialize() def test_shrink_remote_flow_control_settings(self, frame_factory) -> None: """ The remote peer acknowledging our SETTINGS_INITIAL_WINDOW_SIZE shrinks the flow control window. """ c = h2.connection.H2Connection() c.send_headers(1, self.example_request_headers) assert c.remote_flow_control_window(1) == 65535 c.update_settings({h2.settings.SettingCodes.INITIAL_WINDOW_SIZE: 1280}) f = frame_factory.build_settings_frame({}, ack=True) c.receive_data(f.serialize()) assert c.remote_flow_control_window(1) == 1280 def test_grow_remote_flow_control_settings(self, frame_factory) -> None: """ The remote peer acknowledging our SETTINGS_INITIAL_WINDOW_SIZE grows the flow control window. """ c = h2.connection.H2Connection() c.send_headers(1, self.example_request_headers) # Increase the connection flow control window greatly. c.increment_flow_control_window(increment=128000) assert c.remote_flow_control_window(1) == 65535 c.update_settings( {h2.settings.SettingCodes.INITIAL_WINDOW_SIZE: 128000}, ) f = frame_factory.build_settings_frame({}, ack=True) c.receive_data(f.serialize()) assert c.remote_flow_control_window(1) == 128000 def test_new_streams_have_remote_flow_control(self, frame_factory) -> None: """ After a SETTINGS_INITIAL_WINDOW_SIZE change is acknowledged by the remote peer, new streams have appropriate new flow control windows. """ c = h2.connection.H2Connection() c.update_settings( {h2.settings.SettingCodes.INITIAL_WINDOW_SIZE: 128000}, ) f = frame_factory.build_settings_frame({}, ack=True) c.receive_data(f.serialize()) # Increase the connection flow control window greatly. c.increment_flow_control_window(increment=128000) c.send_headers(1, self.example_request_headers) assert c.remote_flow_control_window(1) == 128000 @pytest.mark.parametrize( "increment", [0, -15, 2**31], ) def test_reject_bad_attempts_to_increment_flow_control(self, increment) -> None: """ Attempting to increment a flow control increment outside the valid range causes a ValueError to be raised. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(1, self.example_request_headers, end_stream=True) c.clear_outbound_data_buffer() # Fails both on and off streams. with pytest.raises(ValueError): c.increment_flow_control_window(increment=increment, stream_id=1) with pytest.raises(ValueError): c.increment_flow_control_window(increment=increment) @pytest.mark.parametrize("stream_id", [0, 1]) def test_reject_bad_remote_increments(self, frame_factory, stream_id) -> None: """ Remote peers attempting to increment flow control outside the valid range cause connection errors of type PROTOCOL_ERROR. """ # The only number that can be encoded in a WINDOW_UPDATE frame but # isn't valid is 0. c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(1, self.example_request_headers, end_stream=True) c.clear_outbound_data_buffer() f = frame_factory.build_window_update_frame( stream_id=stream_id, increment=0, ) with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(f.serialize()) expected_frame = frame_factory.build_goaway_frame( last_stream_id=0, error_code=h2.errors.ErrorCodes.PROTOCOL_ERROR, ) assert c.data_to_send() == expected_frame.serialize() def test_reject_increasing_connection_window_too_far(self, frame_factory) -> None: """ Attempts by the remote peer to increase the connection flow control window beyond 2**31 - 1 are rejected. """ c = h2.connection.H2Connection() c.initiate_connection() c.clear_outbound_data_buffer() increment = 2**31 - c.outbound_flow_control_window f = frame_factory.build_window_update_frame( stream_id=0, increment=increment, ) with pytest.raises(h2.exceptions.FlowControlError): c.receive_data(f.serialize()) expected_frame = frame_factory.build_goaway_frame( last_stream_id=0, error_code=h2.errors.ErrorCodes.FLOW_CONTROL_ERROR, ) assert c.data_to_send() == expected_frame.serialize() def test_reject_increasing_stream_window_too_far(self, frame_factory) -> None: """ Attempts by the remote peer to increase the stream flow control window beyond 2**31 - 1 are rejected. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(1, self.example_request_headers) c.clear_outbound_data_buffer() increment = 2**31 - c.outbound_flow_control_window f = frame_factory.build_window_update_frame( stream_id=1, increment=increment, ) events = c.receive_data(f.serialize()) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.StreamReset) assert event.stream_id == 1 assert event.error_code == h2.errors.ErrorCodes.FLOW_CONTROL_ERROR assert not event.remote_reset expected_frame = frame_factory.build_rst_stream_frame( stream_id=1, error_code=h2.errors.ErrorCodes.FLOW_CONTROL_ERROR, ) assert c.data_to_send() == expected_frame.serialize() def test_reject_overlarge_conn_window_settings(self, frame_factory) -> None: """ SETTINGS frames cannot change the size of the connection flow control window. """ c = h2.connection.H2Connection() c.initiate_connection() # Go one byte smaller than the limit. increment = 2**31 - 1 - c.outbound_flow_control_window f = frame_factory.build_window_update_frame( stream_id=0, increment=increment, ) c.receive_data(f.serialize()) # Receive an increment to the initial window size. f = frame_factory.build_settings_frame( settings={ h2.settings.SettingCodes.INITIAL_WINDOW_SIZE: self.DEFAULT_FLOW_WINDOW + 1, }, ) c.clear_outbound_data_buffer() # No error is encountered. events = c.receive_data(f.serialize()) assert len(events) == 1 assert isinstance(events[0], h2.events.RemoteSettingsChanged) expected_frame = frame_factory.build_settings_frame( settings={}, ack=True, ) assert c.data_to_send() == expected_frame.serialize() def test_reject_overlarge_stream_window_settings(self, frame_factory) -> None: """ Remote attempts to create overlarge stream windows via SETTINGS frames are rejected. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(1, self.example_request_headers) # Go one byte smaller than the limit. increment = 2**31 - 1 - c.outbound_flow_control_window f = frame_factory.build_window_update_frame( stream_id=1, increment=increment, ) c.receive_data(f.serialize()) # Receive an increment to the initial window size. f = frame_factory.build_settings_frame( settings={ h2.settings.SettingCodes.INITIAL_WINDOW_SIZE: self.DEFAULT_FLOW_WINDOW + 1, }, ) c.clear_outbound_data_buffer() with pytest.raises(h2.exceptions.FlowControlError): c.receive_data(f.serialize()) expected_frame = frame_factory.build_goaway_frame( last_stream_id=0, error_code=h2.errors.ErrorCodes.FLOW_CONTROL_ERROR, ) assert c.data_to_send() == expected_frame.serialize() def test_reject_local_overlarge_increase_connection_window(self) -> None: """ Local attempts to increase the connection window too far are rejected. """ c = h2.connection.H2Connection() c.initiate_connection() increment = 2**31 - c.inbound_flow_control_window with pytest.raises(h2.exceptions.FlowControlError): c.increment_flow_control_window(increment=increment) def test_reject_local_overlarge_increase_stream_window(self) -> None: """ Local attempts to increase the connection window too far are rejected. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(1, self.example_request_headers) increment = 2**31 - c.inbound_flow_control_window with pytest.raises(h2.exceptions.FlowControlError): c.increment_flow_control_window(increment=increment, stream_id=1) def test_send_update_on_closed_streams(self, frame_factory) -> None: c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(1, self.example_request_headers) c.reset_stream(1) c.clear_outbound_data_buffer() c.open_outbound_streams c.open_inbound_streams f = frame_factory.build_data_frame(b"some data"*1500) events = c.receive_data(f.serialize()*3) assert not events expected = frame_factory.build_rst_stream_frame( stream_id=1, error_code=h2.errors.ErrorCodes.STREAM_CLOSED, ).serialize() * 2 + frame_factory.build_window_update_frame( stream_id=0, increment=40500, ).serialize() + frame_factory.build_rst_stream_frame( stream_id=1, error_code=h2.errors.ErrorCodes.STREAM_CLOSED, ).serialize() assert c.data_to_send() == expected f = frame_factory.build_data_frame(b"") events = c.receive_data(f.serialize()) assert not events expected = frame_factory.build_rst_stream_frame( stream_id=1, error_code=h2.errors.ErrorCodes.STREAM_CLOSED, ).serialize() assert c.data_to_send() == expected class TestAutomaticFlowControl: """ Tests for the automatic flow control logic. """ example_request_headers = [ (":authority", "example.com"), (":path", "/"), (":scheme", "https"), (":method", "GET"), ] server_config = h2.config.H2Configuration(client_side=False) DEFAULT_FLOW_WINDOW = 65535 def _setup_connection_and_send_headers(self, frame_factory): """ Setup a server-side H2Connection and send a headers frame, and then clear the outbound data buffer. Also increase the maximum frame size. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) c.update_settings( {h2.settings.SettingCodes.MAX_FRAME_SIZE: self.DEFAULT_FLOW_WINDOW}, ) settings_frame = frame_factory.build_settings_frame( settings={}, ack=True, ) c.receive_data(settings_frame.serialize()) c.clear_outbound_data_buffer() headers_frame = frame_factory.build_headers_frame( headers=self.example_request_headers, ) c.receive_data(headers_frame.serialize()) c.clear_outbound_data_buffer() return c @given(stream_id=integers(max_value=0)) @settings(suppress_health_check=[HealthCheck.function_scoped_fixture]) def test_must_acknowledge_for_stream(self, frame_factory, stream_id) -> None: """ Flow control acknowledgements must be done on a stream ID that is greater than zero. """ # We need to refresh the encoder because hypothesis has a problem with # integrating with py.test, meaning that we use the same frame factory # for all tests. # See https://github.com/HypothesisWorks/hypothesis-python/issues/377 frame_factory.refresh_encoder() # Create a connection in a state that might actually accept # data acknolwedgement. c = self._setup_connection_and_send_headers(frame_factory) data_frame = frame_factory.build_data_frame( b"some data", flags=["END_STREAM"], ) c.receive_data(data_frame.serialize()) with pytest.raises(ValueError): c.acknowledge_received_data( acknowledged_size=5, stream_id=stream_id, ) @given(size=integers(max_value=-1)) @settings(suppress_health_check=[HealthCheck.function_scoped_fixture]) def test_cannot_acknowledge_less_than_zero(self, frame_factory, size) -> None: """ The user must acknowledge at least 0 bytes. """ # We need to refresh the encoder because hypothesis has a problem with # integrating with py.test, meaning that we use the same frame factory # for all tests. # See https://github.com/HypothesisWorks/hypothesis-python/issues/377 frame_factory.refresh_encoder() # Create a connection in a state that might actually accept # data acknolwedgement. c = self._setup_connection_and_send_headers(frame_factory) data_frame = frame_factory.build_data_frame( b"some data", flags=["END_STREAM"], ) c.receive_data(data_frame.serialize()) with pytest.raises(ValueError): c.acknowledge_received_data(acknowledged_size=size, stream_id=1) def test_acknowledging_small_chunks_does_nothing(self, frame_factory) -> None: """ When a small amount of data is received and acknowledged, no window update is emitted. """ c = self._setup_connection_and_send_headers(frame_factory) data_frame = frame_factory.build_data_frame( b"some data", flags=["END_STREAM"], ) data_event = c.receive_data(data_frame.serialize())[0] c.acknowledge_received_data( data_event.flow_controlled_length, stream_id=1, ) assert not c.data_to_send() def test_acknowledging_no_data_does_nothing(self, frame_factory) -> None: """ If a user accidentally acknowledges no data, nothing happens. """ c = self._setup_connection_and_send_headers(frame_factory) # Send an empty data frame, just to give the user impetus to ack the # data. data_frame = frame_factory.build_data_frame(b"") c.receive_data(data_frame.serialize()) c.acknowledge_received_data(0, stream_id=1) assert not c.data_to_send() @pytest.mark.parametrize("force_cleanup", [True, False]) def test_acknowledging_data_on_closed_stream(self, frame_factory, force_cleanup) -> None: """ When acknowledging data on a stream that has just been closed, no acknowledgement is given for that stream, only for the connection. """ c = self._setup_connection_and_send_headers(frame_factory) data_to_send = b"\x00" * self.DEFAULT_FLOW_WINDOW data_frame = frame_factory.build_data_frame(data_to_send) c.receive_data(data_frame.serialize()) rst_frame = frame_factory.build_rst_stream_frame( stream_id=1, ) c.receive_data(rst_frame.serialize()) c.clear_outbound_data_buffer() if force_cleanup: # Check how many streams are open to force the old one to be # cleaned up. assert c.open_outbound_streams == 0 c.acknowledge_received_data(2048, stream_id=1) expected = frame_factory.build_window_update_frame( stream_id=0, increment=2048, ) assert c.data_to_send() == expected.serialize() def test_acknowledging_streams_we_never_saw(self, frame_factory) -> None: """ If the user acknowledges a stream ID we've never seen, that raises a NoSuchStreamError. """ c = self._setup_connection_and_send_headers(frame_factory) c.clear_outbound_data_buffer() with pytest.raises(h2.exceptions.NoSuchStreamError): c.acknowledge_received_data(2048, stream_id=101) @given(integers(min_value=1025, max_value=DEFAULT_FLOW_WINDOW)) @settings(suppress_health_check=[HealthCheck.function_scoped_fixture]) def test_acknowledging_1024_bytes_when_empty_increments(self, frame_factory, increment) -> None: """ If the flow control window is empty and we acknowledge 1024 bytes or more, we will emit a WINDOW_UPDATE frame just to move the connection forward. """ # We need to refresh the encoder because hypothesis has a problem with # integrating with py.test, meaning that we use the same frame factory # for all tests. # See https://github.com/HypothesisWorks/hypothesis-python/issues/377 frame_factory.refresh_encoder() c = self._setup_connection_and_send_headers(frame_factory) data_to_send = b"\x00" * self.DEFAULT_FLOW_WINDOW data_frame = frame_factory.build_data_frame(data_to_send) c.receive_data(data_frame.serialize()) c.acknowledge_received_data(increment, stream_id=1) first_expected = frame_factory.build_window_update_frame( stream_id=0, increment=increment, ) second_expected = frame_factory.build_window_update_frame( stream_id=1, increment=increment, ) expected_data = b"".join( [first_expected.serialize(), second_expected.serialize()], ) assert c.data_to_send() == expected_data # This test needs to use a lower cap, because otherwise the algo will # increment the stream window anyway. @given(integers(min_value=1025, max_value=(DEFAULT_FLOW_WINDOW // 4) - 1)) @settings(suppress_health_check=[HealthCheck.function_scoped_fixture]) def test_connection_only_empty(self, frame_factory, increment) -> None: """ If the connection flow control window is empty, but the stream flow control windows aren't, and 1024 bytes or more are acknowledged by the user, we increment the connection window only. """ # We need to refresh the encoder because hypothesis has a problem with # integrating with py.test, meaning that we use the same frame factory # for all tests. # See https://github.com/HypothesisWorks/hypothesis-python/issues/377 frame_factory.refresh_encoder() # Here we'll use 4 streams. Set them up. c = self._setup_connection_and_send_headers(frame_factory) for stream_id in [3, 5, 7]: f = frame_factory.build_headers_frame( headers=self.example_request_headers, stream_id=stream_id, ) c.receive_data(f.serialize()) # Now we send 1/4 of the connection window per stream. Annoyingly, # that's an odd number, so we need to round the last frame up. data_to_send = b"\x00" * (self.DEFAULT_FLOW_WINDOW // 4) for stream_id in [1, 3, 5]: f = frame_factory.build_data_frame( data_to_send, stream_id=stream_id, ) c.receive_data(f.serialize()) data_to_send = b"\x00" * c.remote_flow_control_window(7) data_frame = frame_factory.build_data_frame(data_to_send, stream_id=7) c.receive_data(data_frame.serialize()) # Ok, now the actual test. c.acknowledge_received_data(increment, stream_id=1) expected_data = frame_factory.build_window_update_frame( stream_id=0, increment=increment, ).serialize() assert c.data_to_send() == expected_data @given(integers(min_value=1025, max_value=DEFAULT_FLOW_WINDOW)) @settings(suppress_health_check=[HealthCheck.function_scoped_fixture]) def test_mixing_update_forms(self, frame_factory, increment) -> None: """ If the user mixes acknowledging data with manually incrementing windows, we still keep track of what's going on. """ # We need to refresh the encoder because hypothesis has a problem with # integrating with py.test, meaning that we use the same frame factory # for all tests. # See https://github.com/HypothesisWorks/hypothesis-python/issues/377 frame_factory.refresh_encoder() # Empty the flow control window. c = self._setup_connection_and_send_headers(frame_factory) data_to_send = b"\x00" * self.DEFAULT_FLOW_WINDOW data_frame = frame_factory.build_data_frame(data_to_send) c.receive_data(data_frame.serialize()) # Manually increment the connection flow control window back to fully # open, but leave the stream window closed. c.increment_flow_control_window( stream_id=None, increment=self.DEFAULT_FLOW_WINDOW, ) c.clear_outbound_data_buffer() # Now, acknowledge the receipt of that data. This should cause the # stream window to be widened, but not the connection window, because # it is already open. c.acknowledge_received_data(increment, stream_id=1) # We expect to see one window update frame only, for the stream. expected_data = frame_factory.build_window_update_frame( stream_id=1, increment=increment, ).serialize() assert c.data_to_send() == expected_data ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/test_h2_upgrade.py0000644000076500000240000002444014744265074016203 0ustar00kriechistaff""" Tests that exercise the HTTP Upgrade functionality of hyper-h2, ensuring that clients and servers can upgrade their plaintext HTTP/1.1 connections to HTTP/2. """ from __future__ import annotations import base64 import pytest import h2.config import h2.connection import h2.errors import h2.events import h2.exceptions from h2.utilities import utf8_encode_headers EXAMPLE_REQUEST_HEADERS = [ (":authority", "example.com"), (":path", "/"), (":scheme", "https"), (":method", "GET"), ] EXAMPLE_REQUEST_HEADERS_BYTES = [ (b":authority", b"example.com"), (b":path", b"/"), (b":scheme", b"https"), (b":method", b"GET"), ] class TestClientUpgrade: """ Tests of the client-side of the HTTP/2 upgrade dance. """ example_response_headers = [ (b":status", b"200"), (b"server", b"fake-serv/0.1.0"), ] def test_returns_http2_settings(self, frame_factory) -> None: """ Calling initiate_upgrade_connection returns a base64url encoded Settings frame with the settings used by the connection. """ conn = h2.connection.H2Connection() data = conn.initiate_upgrade_connection() # The base64 encoding must not be padded. assert not data.endswith(b"=") # However, SETTINGS frames should never need to be padded. decoded_frame = base64.urlsafe_b64decode(data) expected_frame = frame_factory.build_settings_frame( settings=conn.local_settings, ) assert decoded_frame == expected_frame.serialize_body() def test_emits_preamble(self, frame_factory) -> None: """ Calling initiate_upgrade_connection emits the connection preamble. """ conn = h2.connection.H2Connection() conn.initiate_upgrade_connection() data = conn.data_to_send() assert data.startswith(frame_factory.preamble()) data = data[len(frame_factory.preamble()):] expected_frame = frame_factory.build_settings_frame( settings=conn.local_settings, ) assert data == expected_frame.serialize() def test_can_receive_response(self, frame_factory) -> None: """ After upgrading, we can safely receive a response. """ c = h2.connection.H2Connection() c.initiate_upgrade_connection() c.clear_outbound_data_buffer() f1 = frame_factory.build_headers_frame( stream_id=1, headers=self.example_response_headers, ) f2 = frame_factory.build_data_frame( stream_id=1, data=b"some data", flags=["END_STREAM"], ) events = c.receive_data(f1.serialize() + f2.serialize()) assert len(events) == 3 assert isinstance(events[0], h2.events.ResponseReceived) assert isinstance(events[1], h2.events.DataReceived) assert isinstance(events[2], h2.events.StreamEnded) assert events[0].headers == self.example_response_headers assert events[1].data == b"some data" assert all(e.stream_id == 1 for e in events) assert not c.data_to_send() @pytest.mark.parametrize("headers", [EXAMPLE_REQUEST_HEADERS, EXAMPLE_REQUEST_HEADERS_BYTES]) def test_can_receive_pushed_stream(self, frame_factory, headers) -> None: """ After upgrading, we can safely receive a pushed stream. """ c = h2.connection.H2Connection() c.initiate_upgrade_connection() c.clear_outbound_data_buffer() f = frame_factory.build_push_promise_frame( stream_id=1, promised_stream_id=2, headers=headers, ) events = c.receive_data(f.serialize()) assert len(events) == 1 assert isinstance(events[0], h2.events.PushedStreamReceived) assert events[0].headers == utf8_encode_headers(headers) assert events[0].parent_stream_id == 1 assert events[0].pushed_stream_id == 2 @pytest.mark.parametrize("headers", [EXAMPLE_REQUEST_HEADERS, EXAMPLE_REQUEST_HEADERS_BYTES]) def test_cannot_send_headers_stream_1(self, frame_factory, headers) -> None: """ After upgrading, we cannot send headers on stream 1. """ c = h2.connection.H2Connection() c.initiate_upgrade_connection() c.clear_outbound_data_buffer() with pytest.raises(h2.exceptions.ProtocolError): c.send_headers(stream_id=1, headers=headers) def test_cannot_send_data_stream_1(self, frame_factory) -> None: """ After upgrading, we cannot send data on stream 1. """ c = h2.connection.H2Connection() c.initiate_upgrade_connection() c.clear_outbound_data_buffer() with pytest.raises(h2.exceptions.ProtocolError): c.send_data(stream_id=1, data=b"some data") class TestServerUpgrade: """ Tests of the server-side of the HTTP/2 upgrade dance. """ example_response_headers = [ (b":status", b"200"), (b"server", b"fake-serv/0.1.0"), ] server_config = h2.config.H2Configuration(client_side=False) def test_returns_nothing(self, frame_factory) -> None: """ Calling initiate_upgrade_connection returns nothing. """ conn = h2.connection.H2Connection(config=self.server_config) curl_header = b"AAMAAABkAAQAAP__" data = conn.initiate_upgrade_connection(curl_header) assert data is None def test_emits_preamble(self, frame_factory) -> None: """ Calling initiate_upgrade_connection emits the connection preamble. """ conn = h2.connection.H2Connection(config=self.server_config) conn.initiate_upgrade_connection() data = conn.data_to_send() expected_frame = frame_factory.build_settings_frame( settings=conn.local_settings, ) assert data == expected_frame.serialize() def test_can_send_response(self, frame_factory) -> None: """ After upgrading, we can safely send a response. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_upgrade_connection() c.clear_outbound_data_buffer() c.send_headers(stream_id=1, headers=self.example_response_headers) c.send_data(stream_id=1, data=b"some data", end_stream=True) f1 = frame_factory.build_headers_frame( stream_id=1, headers=self.example_response_headers, ) f2 = frame_factory.build_data_frame( stream_id=1, data=b"some data", flags=["END_STREAM"], ) expected_data = f1.serialize() + f2.serialize() assert c.data_to_send() == expected_data @pytest.mark.parametrize("headers", [EXAMPLE_REQUEST_HEADERS, EXAMPLE_REQUEST_HEADERS_BYTES]) def test_can_push_stream(self, frame_factory, headers) -> None: """ After upgrading, we can safely push a stream. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_upgrade_connection() c.clear_outbound_data_buffer() c.push_stream( stream_id=1, promised_stream_id=2, request_headers=headers, ) f = frame_factory.build_push_promise_frame( stream_id=1, promised_stream_id=2, headers=headers, ) assert c.data_to_send() == f.serialize() @pytest.mark.parametrize("headers", [EXAMPLE_REQUEST_HEADERS, EXAMPLE_REQUEST_HEADERS_BYTES]) def test_cannot_receive_headers_stream_1(self, frame_factory, headers) -> None: """ After upgrading, we cannot receive headers on stream 1. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_upgrade_connection() c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() f = frame_factory.build_headers_frame( stream_id=1, headers=headers, ) c.receive_data(f.serialize()) expected_frame = frame_factory.build_rst_stream_frame( stream_id=1, error_code=h2.errors.ErrorCodes.STREAM_CLOSED, ) assert c.data_to_send() == expected_frame.serialize() def test_cannot_receive_data_stream_1(self, frame_factory) -> None: """ After upgrading, we cannot receive data on stream 1. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_upgrade_connection() c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() f = frame_factory.build_data_frame( stream_id=1, data=b"some data", ) c.receive_data(f.serialize()) expected = frame_factory.build_rst_stream_frame( stream_id=1, error_code=h2.errors.ErrorCodes.STREAM_CLOSED, ).serialize() assert c.data_to_send() == expected def test_client_settings_are_applied(self, frame_factory) -> None: """ The settings provided by the client are applied and immediately ACK'ed. """ server = h2.connection.H2Connection(config=self.server_config) client = h2.connection.H2Connection() # As a precaution, let's confirm that the server and client, at the # start of the connection, do not agree on their initial settings # state. assert ( client.local_settings != server.remote_settings ) # Get the client header data and pass it to the server. header_data = client.initiate_upgrade_connection() server.initiate_upgrade_connection(header_data) # This gets complex, but here we go. # RFC 7540 § 3.2.1 says that "explicit acknowledgement" of the settings # in the header is "not necessary". That's annoyingly vague, but we # interpret that to mean "should not be sent". So to test that this # worked we need to test that the server has only sent the preamble, # and has not sent a SETTINGS ack, and also that the server has the # correct settings. expected_frame = frame_factory.build_settings_frame( server.local_settings, ) assert server.data_to_send() == expected_frame.serialize() assert ( client.local_settings == server.remote_settings ) ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/test_head_request.py0000644000076500000240000000347314744265074016637 0ustar00kriechistafffrom __future__ import annotations import pytest import h2.connection EXAMPLE_REQUEST_HEADERS_BYTES = [ (b":authority", b"example.com"), (b":path", b"/"), (b":scheme", b"https"), (b":method", b"HEAD"), ] EXAMPLE_REQUEST_HEADERS = [ (":authority", "example.com"), (":path", "/"), (":scheme", "https"), (":method", "HEAD"), ] class TestHeadRequest: example_response_headers = [ (b":status", b"200"), (b"server", b"fake-serv/0.1.0"), (b"content_length", b"1"), ] @pytest.mark.parametrize("headers", [EXAMPLE_REQUEST_HEADERS, EXAMPLE_REQUEST_HEADERS_BYTES]) def test_non_zero_content_and_no_body(self, frame_factory, headers) -> None: c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(1, headers, end_stream=True) f = frame_factory.build_headers_frame( self.example_response_headers, flags=["END_STREAM"], ) events = c.receive_data(f.serialize()) assert len(events) == 2 event = events[0] assert isinstance(event, h2.events.ResponseReceived) assert event.stream_id == 1 assert event.headers == self.example_response_headers @pytest.mark.parametrize("headers", [EXAMPLE_REQUEST_HEADERS, EXAMPLE_REQUEST_HEADERS_BYTES]) def test_reject_non_zero_content_and_body(self, frame_factory, headers) -> None: c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(1, headers) headers = frame_factory.build_headers_frame( self.example_response_headers, ) data = frame_factory.build_data_frame(data=b"\x01") c.receive_data(headers.serialize()) with pytest.raises(h2.exceptions.InvalidBodyLengthError): c.receive_data(data.serialize()) ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/test_header_indexing.py0000644000076500000240000005613714744265074017310 0ustar00kriechistaff""" This module contains tests that use HPACK header tuples that provide additional metadata to the hpack module about how to encode the headers. """ from __future__ import annotations import pytest from hpack import HeaderTuple, NeverIndexedHeaderTuple import h2.config import h2.connection def assert_header_blocks_actually_equal(block_a, block_b) -> None: """ Asserts that two header bocks are really, truly equal, down to the types of their tuples. Doesn't return anything. """ assert len(block_a) == len(block_b) for a, b in zip(block_a, block_b): assert a == b assert a.__class__ is b.__class__ class TestHeaderIndexing: """ Test that Hyper-h2 can correctly handle never indexed header fields using the appropriate hpack data structures. """ example_request_headers = [ HeaderTuple(":authority", "example.com"), HeaderTuple(":path", "/"), HeaderTuple(":scheme", "https"), HeaderTuple(":method", "GET"), ] bytes_example_request_headers = [ HeaderTuple(b":authority", b"example.com"), HeaderTuple(b":path", b"/"), HeaderTuple(b":scheme", b"https"), HeaderTuple(b":method", b"GET"), ] extended_request_headers = [ HeaderTuple(":authority", "example.com"), HeaderTuple(":path", "/"), HeaderTuple(":scheme", "https"), HeaderTuple(":method", "GET"), NeverIndexedHeaderTuple("authorization", "realpassword"), ] bytes_extended_request_headers = [ HeaderTuple(b":authority", b"example.com"), HeaderTuple(b":path", b"/"), HeaderTuple(b":scheme", b"https"), HeaderTuple(b":method", b"GET"), NeverIndexedHeaderTuple(b"authorization", b"realpassword"), ] example_response_headers = [ HeaderTuple(":status", "200"), HeaderTuple("server", "fake-serv/0.1.0"), ] bytes_example_response_headers = [ HeaderTuple(b":status", b"200"), HeaderTuple(b"server", b"fake-serv/0.1.0"), ] extended_response_headers = [ HeaderTuple(":status", "200"), HeaderTuple("server", "fake-serv/0.1.0"), NeverIndexedHeaderTuple("secure", "you-bet"), ] bytes_extended_response_headers = [ HeaderTuple(b":status", b"200"), HeaderTuple(b"server", b"fake-serv/0.1.0"), NeverIndexedHeaderTuple(b"secure", b"you-bet"), ] server_config = h2.config.H2Configuration(client_side=False) @pytest.mark.parametrize( "headers", [ example_request_headers, bytes_example_request_headers, extended_request_headers, bytes_extended_request_headers, ], ) def test_sending_header_tuples(self, headers, frame_factory) -> None: """ Providing HeaderTuple and HeaderTuple subclasses preserves the metadata about indexing. """ c = h2.connection.H2Connection() c.initiate_connection() # Clear the data, then send headers. c.clear_outbound_data_buffer() c.send_headers(1, headers) f = frame_factory.build_headers_frame(headers=headers) assert c.data_to_send() == f.serialize() @pytest.mark.parametrize( "headers", [ example_request_headers, bytes_example_request_headers, extended_request_headers, bytes_extended_request_headers, ], ) def test_header_tuples_in_pushes(self, headers, frame_factory) -> None: """ Providing HeaderTuple and HeaderTuple subclasses to push promises preserves metadata about indexing. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) # We can use normal headers for the request. f = frame_factory.build_headers_frame( self.example_request_headers, ) c.receive_data(f.serialize()) frame_factory.refresh_encoder() expected_frame = frame_factory.build_push_promise_frame( stream_id=1, promised_stream_id=2, headers=headers, flags=["END_HEADERS"], ) c.clear_outbound_data_buffer() c.push_stream( stream_id=1, promised_stream_id=2, request_headers=headers, ) assert c.data_to_send() == expected_frame.serialize() @pytest.mark.parametrize( ("headers", "encoding"), [ (example_request_headers, "utf-8"), (bytes_example_request_headers, None), (extended_request_headers, "utf-8"), (bytes_extended_request_headers, None), ], ) def test_header_tuples_are_decoded_request(self, headers, encoding, frame_factory) -> None: """ The indexing status of the header is preserved when emitting RequestReceived events. """ config = h2.config.H2Configuration( client_side=False, header_encoding=encoding, ) c = h2.connection.H2Connection(config=config) c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame(headers) data = f.serialize() events = c.receive_data(data) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.RequestReceived) assert_header_blocks_actually_equal(headers, event.headers) @pytest.mark.parametrize( ("headers", "encoding"), [ (example_response_headers, "utf-8"), (bytes_example_response_headers, None), (extended_response_headers, "utf-8"), (bytes_extended_response_headers, None), ], ) def test_header_tuples_are_decoded_response(self, headers, encoding, frame_factory) -> None: """ The indexing status of the header is preserved when emitting ResponseReceived events. """ config = h2.config.H2Configuration( header_encoding=encoding, ) c = h2.connection.H2Connection(config=config) c.initiate_connection() c.send_headers(stream_id=1, headers=self.example_request_headers) f = frame_factory.build_headers_frame(headers) data = f.serialize() events = c.receive_data(data) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.ResponseReceived) assert_header_blocks_actually_equal(headers, event.headers) @pytest.mark.parametrize( ("headers", "encoding"), [ (example_response_headers, "utf-8"), (bytes_example_response_headers, None), (extended_response_headers, "utf-8"), (bytes_extended_response_headers, None), ], ) def test_header_tuples_are_decoded_info_response(self, headers, encoding, frame_factory) -> None: """ The indexing status of the header is preserved when emitting InformationalResponseReceived events. """ # Manipulate the headers to send 100 Continue. We need to copy the list # to avoid breaking the example headers. headers = headers[:] if encoding: headers[0] = HeaderTuple(":status", "100") else: headers[0] = HeaderTuple(b":status", b"100") config = h2.config.H2Configuration( header_encoding=encoding, ) c = h2.connection.H2Connection(config=config) c.initiate_connection() c.send_headers(stream_id=1, headers=self.example_request_headers) f = frame_factory.build_headers_frame(headers) data = f.serialize() events = c.receive_data(data) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.InformationalResponseReceived) assert_header_blocks_actually_equal(headers, event.headers) @pytest.mark.parametrize( ("headers", "encoding"), [ (example_response_headers, "utf-8"), (bytes_example_response_headers, None), (extended_response_headers, "utf-8"), (bytes_extended_response_headers, None), ], ) def test_header_tuples_are_decoded_trailers(self, headers, encoding, frame_factory) -> None: """ The indexing status of the header is preserved when emitting TrailersReceived events. """ # Manipulate the headers to remove the status, which shouldn't be in # the trailers. We need to copy the list to avoid breaking the example # headers. headers = headers[1:] config = h2.config.H2Configuration( header_encoding=encoding, ) c = h2.connection.H2Connection(config=config) c.initiate_connection() c.send_headers(stream_id=1, headers=self.example_request_headers) f = frame_factory.build_headers_frame(self.example_response_headers) data = f.serialize() c.receive_data(data) f = frame_factory.build_headers_frame(headers, flags=["END_STREAM"]) data = f.serialize() events = c.receive_data(data) assert len(events) == 2 event = events[0] assert isinstance(event, h2.events.TrailersReceived) assert_header_blocks_actually_equal(headers, event.headers) @pytest.mark.parametrize( ("headers", "encoding"), [ (example_request_headers, "utf-8"), (bytes_example_request_headers, None), (extended_request_headers, "utf-8"), (bytes_extended_request_headers, None), ], ) def test_header_tuples_are_decoded_push_promise(self, headers, encoding, frame_factory) -> None: """ The indexing status of the header is preserved when emitting PushedStreamReceived events. """ config = h2.config.H2Configuration( header_encoding=encoding, ) c = h2.connection.H2Connection(config=config) c.initiate_connection() c.send_headers(stream_id=1, headers=self.example_request_headers) f = frame_factory.build_push_promise_frame( stream_id=1, promised_stream_id=2, headers=headers, flags=["END_HEADERS"], ) data = f.serialize() events = c.receive_data(data) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.PushedStreamReceived) assert_header_blocks_actually_equal(headers, event.headers) class TestSecureHeaders: """ Certain headers should always be transformed to their never-indexed form. """ example_request_headers = [ (":authority", "example.com"), (":path", "/"), (":scheme", "https"), (":method", "GET"), ] bytes_example_request_headers = [ (b":authority", b"example.com"), (b":path", b"/"), (b":scheme", b"https"), (b":method", b"GET"), ] possible_auth_headers = [ ("authorization", "test"), ("Authorization", "test"), ("authorization", "really long test"), HeaderTuple("authorization", "test"), HeaderTuple("Authorization", "test"), HeaderTuple("authorization", "really long test"), NeverIndexedHeaderTuple("authorization", "test"), NeverIndexedHeaderTuple("Authorization", "test"), NeverIndexedHeaderTuple("authorization", "really long test"), (b"authorization", b"test"), (b"Authorization", b"test"), (b"authorization", b"really long test"), HeaderTuple(b"authorization", b"test"), HeaderTuple(b"Authorization", b"test"), HeaderTuple(b"authorization", b"really long test"), NeverIndexedHeaderTuple(b"authorization", b"test"), NeverIndexedHeaderTuple(b"Authorization", b"test"), NeverIndexedHeaderTuple(b"authorization", b"really long test"), ("proxy-authorization", "test"), ("Proxy-Authorization", "test"), ("proxy-authorization", "really long test"), HeaderTuple("proxy-authorization", "test"), HeaderTuple("Proxy-Authorization", "test"), HeaderTuple("proxy-authorization", "really long test"), NeverIndexedHeaderTuple("proxy-authorization", "test"), NeverIndexedHeaderTuple("Proxy-Authorization", "test"), NeverIndexedHeaderTuple("proxy-authorization", "really long test"), (b"proxy-authorization", b"test"), (b"Proxy-Authorization", b"test"), (b"proxy-authorization", b"really long test"), HeaderTuple(b"proxy-authorization", b"test"), HeaderTuple(b"Proxy-Authorization", b"test"), HeaderTuple(b"proxy-authorization", b"really long test"), NeverIndexedHeaderTuple(b"proxy-authorization", b"test"), NeverIndexedHeaderTuple(b"Proxy-Authorization", b"test"), NeverIndexedHeaderTuple(b"proxy-authorization", b"really long test"), ] secured_cookie_headers = [ ("cookie", "short"), ("Cookie", "short"), ("cookie", "nineteen byte cooki"), HeaderTuple("cookie", "short"), HeaderTuple("Cookie", "short"), HeaderTuple("cookie", "nineteen byte cooki"), NeverIndexedHeaderTuple("cookie", "short"), NeverIndexedHeaderTuple("Cookie", "short"), NeverIndexedHeaderTuple("cookie", "nineteen byte cooki"), NeverIndexedHeaderTuple("cookie", "longer manually secured cookie"), (b"cookie", b"short"), (b"Cookie", b"short"), (b"cookie", b"nineteen byte cooki"), HeaderTuple(b"cookie", b"short"), HeaderTuple(b"Cookie", b"short"), HeaderTuple(b"cookie", b"nineteen byte cooki"), NeverIndexedHeaderTuple(b"cookie", b"short"), NeverIndexedHeaderTuple(b"Cookie", b"short"), NeverIndexedHeaderTuple(b"cookie", b"nineteen byte cooki"), NeverIndexedHeaderTuple(b"cookie", b"longer manually secured cookie"), ] unsecured_cookie_headers = [ ("cookie", "twenty byte cookie!!"), ("Cookie", "twenty byte cookie!!"), ("cookie", "substantially longer than 20 byte cookie"), HeaderTuple("cookie", "twenty byte cookie!!"), HeaderTuple("cookie", "twenty byte cookie!!"), HeaderTuple("Cookie", "twenty byte cookie!!"), (b"cookie", b"twenty byte cookie!!"), (b"Cookie", b"twenty byte cookie!!"), (b"cookie", b"substantially longer than 20 byte cookie"), HeaderTuple(b"cookie", b"twenty byte cookie!!"), HeaderTuple(b"cookie", b"twenty byte cookie!!"), HeaderTuple(b"Cookie", b"twenty byte cookie!!"), ] server_config = h2.config.H2Configuration(client_side=False) @pytest.mark.parametrize( "headers", [example_request_headers, bytes_example_request_headers], ) @pytest.mark.parametrize("auth_header", possible_auth_headers) def test_authorization_headers_never_indexed(self, headers, auth_header, frame_factory) -> None: """ Authorization and Proxy-Authorization headers are always forced to be never-indexed, regardless of their form. """ # Regardless of what we send, we expect it to be never indexed. send_headers = [*headers, auth_header] expected_headers = [*headers, NeverIndexedHeaderTuple(auth_header[0].lower(), auth_header[1])] c = h2.connection.H2Connection() c.initiate_connection() # Clear the data, then send headers. c.clear_outbound_data_buffer() c.send_headers(1, send_headers) f = frame_factory.build_headers_frame(headers=expected_headers) assert c.data_to_send() == f.serialize() @pytest.mark.parametrize( "headers", [example_request_headers, bytes_example_request_headers], ) @pytest.mark.parametrize("auth_header", possible_auth_headers) def test_authorization_headers_never_indexed_push(self, headers, auth_header, frame_factory) -> None: """ Authorization and Proxy-Authorization headers are always forced to be never-indexed, regardless of their form, when pushed by a server. """ # Regardless of what we send, we expect it to be never indexed. send_headers = [*headers, auth_header] expected_headers = [*headers, NeverIndexedHeaderTuple(auth_header[0].lower(), auth_header[1])] c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) # We can use normal headers for the request. f = frame_factory.build_headers_frame( self.example_request_headers, ) c.receive_data(f.serialize()) frame_factory.refresh_encoder() expected_frame = frame_factory.build_push_promise_frame( stream_id=1, promised_stream_id=2, headers=expected_headers, flags=["END_HEADERS"], ) c.clear_outbound_data_buffer() c.push_stream( stream_id=1, promised_stream_id=2, request_headers=send_headers, ) assert c.data_to_send() == expected_frame.serialize() @pytest.mark.parametrize( "headers", [example_request_headers, bytes_example_request_headers], ) @pytest.mark.parametrize("cookie_header", secured_cookie_headers) def test_short_cookie_headers_never_indexed(self, headers, cookie_header, frame_factory) -> None: """ Short cookie headers, and cookies provided as NeverIndexedHeaderTuple, are never indexed. """ # Regardless of what we send, we expect it to be never indexed. send_headers = [*headers, cookie_header] expected_headers = [*headers, NeverIndexedHeaderTuple(cookie_header[0].lower(), cookie_header[1])] c = h2.connection.H2Connection() c.initiate_connection() # Clear the data, then send headers. c.clear_outbound_data_buffer() c.send_headers(1, send_headers) f = frame_factory.build_headers_frame(headers=expected_headers) assert c.data_to_send() == f.serialize() @pytest.mark.parametrize( "headers", [example_request_headers, bytes_example_request_headers], ) @pytest.mark.parametrize("cookie_header", secured_cookie_headers) def test_short_cookie_headers_never_indexed_push(self, headers, cookie_header, frame_factory) -> None: """ Short cookie headers, and cookies provided as NeverIndexedHeaderTuple, are never indexed when pushed by servers. """ # Regardless of what we send, we expect it to be never indexed. send_headers = [*headers, cookie_header] expected_headers = [*headers, NeverIndexedHeaderTuple(cookie_header[0].lower(), cookie_header[1])] c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) # We can use normal headers for the request. f = frame_factory.build_headers_frame( self.example_request_headers, ) c.receive_data(f.serialize()) frame_factory.refresh_encoder() expected_frame = frame_factory.build_push_promise_frame( stream_id=1, promised_stream_id=2, headers=expected_headers, flags=["END_HEADERS"], ) c.clear_outbound_data_buffer() c.push_stream( stream_id=1, promised_stream_id=2, request_headers=send_headers, ) assert c.data_to_send() == expected_frame.serialize() @pytest.mark.parametrize( "headers", [example_request_headers, bytes_example_request_headers], ) @pytest.mark.parametrize("cookie_header", unsecured_cookie_headers) def test_long_cookie_headers_can_be_indexed(self, headers, cookie_header, frame_factory) -> None: """ Longer cookie headers can be indexed. """ # Regardless of what we send, we expect it to be indexed. send_headers = [*headers, cookie_header] expected_headers = [*headers, HeaderTuple(cookie_header[0].lower(), cookie_header[1])] c = h2.connection.H2Connection() c.initiate_connection() # Clear the data, then send headers. c.clear_outbound_data_buffer() c.send_headers(1, send_headers) f = frame_factory.build_headers_frame(headers=expected_headers) assert c.data_to_send() == f.serialize() @pytest.mark.parametrize( "headers", [example_request_headers, bytes_example_request_headers], ) @pytest.mark.parametrize("cookie_header", unsecured_cookie_headers) def test_long_cookie_headers_can_be_indexed_push(self, headers, cookie_header, frame_factory) -> None: """ Longer cookie headers can be indexed. """ # Regardless of what we send, we expect it to be never indexed. send_headers = [*headers, cookie_header] expected_headers = [*headers, HeaderTuple(cookie_header[0].lower(), cookie_header[1])] c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) # We can use normal headers for the request. f = frame_factory.build_headers_frame( self.example_request_headers, ) c.receive_data(f.serialize()) frame_factory.refresh_encoder() expected_frame = frame_factory.build_push_promise_frame( stream_id=1, promised_stream_id=2, headers=expected_headers, flags=["END_HEADERS"], ) c.clear_outbound_data_buffer() c.push_stream( stream_id=1, promised_stream_id=2, request_headers=send_headers, ) assert c.data_to_send() == expected_frame.serialize() ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/test_informational_responses.py0000644000076500000240000003662014744265074021131 0ustar00kriechistaff""" Tests that validate that hyper-h2 correctly handles informational (1XX) responses in its state machine. """ from __future__ import annotations import pytest import h2.config import h2.connection import h2.events import h2.exceptions class TestReceivingInformationalResponses: """ Tests for receiving informational responses. """ example_request_headers = [ (b":authority", b"example.com"), (b":path", b"/"), (b":scheme", b"https"), (b":method", b"GET"), (b"expect", b"100-continue"), ] example_informational_headers = [ (b":status", b"100"), (b"server", b"fake-serv/0.1.0"), ] example_response_headers = [ (b":status", b"200"), (b"server", b"fake-serv/0.1.0"), ] example_trailers = [ (b"trailer", b"you-bet"), ] @pytest.mark.parametrize("end_stream", [True, False]) def test_single_informational_response(self, frame_factory, end_stream) -> None: """ When receiving a informational response, the appropriate event is signaled. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers( stream_id=1, headers=self.example_request_headers, end_stream=end_stream, ) f = frame_factory.build_headers_frame( headers=self.example_informational_headers, stream_id=1, ) events = c.receive_data(f.serialize()) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.InformationalResponseReceived) assert event.headers == self.example_informational_headers assert event.stream_id == 1 @pytest.mark.parametrize("end_stream", [True, False]) def test_receiving_multiple_header_blocks(self, frame_factory, end_stream) -> None: """ At least three header blocks can be received: informational, headers, trailers. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers( stream_id=1, headers=self.example_request_headers, end_stream=end_stream, ) f1 = frame_factory.build_headers_frame( headers=self.example_informational_headers, stream_id=1, ) f2 = frame_factory.build_headers_frame( headers=self.example_response_headers, stream_id=1, ) f3 = frame_factory.build_headers_frame( headers=self.example_trailers, stream_id=1, flags=["END_STREAM"], ) events = c.receive_data( f1.serialize() + f2.serialize() + f3.serialize(), ) assert len(events) == 4 assert isinstance(events[0], h2.events.InformationalResponseReceived) assert events[0].headers == self.example_informational_headers assert events[0].stream_id == 1 assert isinstance(events[1], h2.events.ResponseReceived) assert events[1].headers == self.example_response_headers assert events[1].stream_id == 1 assert isinstance(events[2], h2.events.TrailersReceived) assert events[2].headers == self.example_trailers assert events[2].stream_id == 1 @pytest.mark.parametrize("end_stream", [True, False]) def test_receiving_multiple_informational_responses(self, frame_factory, end_stream) -> None: """ More than one informational response is allowed. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers( stream_id=1, headers=self.example_request_headers, end_stream=end_stream, ) f1 = frame_factory.build_headers_frame( headers=self.example_informational_headers, stream_id=1, ) f2 = frame_factory.build_headers_frame( headers=[(":status", "101")], stream_id=1, ) events = c.receive_data(f1.serialize() + f2.serialize()) assert len(events) == 2 assert isinstance(events[0], h2.events.InformationalResponseReceived) assert events[0].headers == self.example_informational_headers assert events[0].stream_id == 1 assert isinstance(events[1], h2.events.InformationalResponseReceived) assert events[1].headers == [(b":status", b"101")] assert events[1].stream_id == 1 @pytest.mark.parametrize("end_stream", [True, False]) def test_receive_provisional_response_with_end_stream(self, frame_factory, end_stream) -> None: """ Receiving provisional responses with END_STREAM set causes ProtocolErrors. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers( stream_id=1, headers=self.example_request_headers, end_stream=end_stream, ) c.clear_outbound_data_buffer() f = frame_factory.build_headers_frame( headers=self.example_informational_headers, stream_id=1, flags=["END_STREAM"], ) with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(f.serialize()) expected = frame_factory.build_goaway_frame( last_stream_id=0, error_code=1, ) assert c.data_to_send() == expected.serialize() @pytest.mark.parametrize("end_stream", [True, False]) def test_receiving_out_of_order_headers(self, frame_factory, end_stream) -> None: """ When receiving a informational response after the actual response headers we consider it a ProtocolError and raise it. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers( stream_id=1, headers=self.example_request_headers, end_stream=end_stream, ) f1 = frame_factory.build_headers_frame( headers=self.example_response_headers, stream_id=1, ) f2 = frame_factory.build_headers_frame( headers=self.example_informational_headers, stream_id=1, ) c.receive_data(f1.serialize()) c.clear_outbound_data_buffer() with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(f2.serialize()) expected = frame_factory.build_goaway_frame( last_stream_id=0, error_code=1, ) assert c.data_to_send() == expected.serialize() class TestSendingInformationalResponses: """ Tests for sending informational responses. """ example_request_headers = [ (":authority", "example.com"), (":path", "/"), (":scheme", "https"), (":method", "GET"), ("expect", "100-continue"), ] bytes_example_request_headers = [ (b":authority", b"example.com"), (b":path", b"/"), (b":scheme", b"https"), (b":method", b"GET"), (b"expect", b"100-continue"), ] informational_headers = [ (":status", "100"), ("server", "fake-serv/0.1.0"), ] bytes_informational_headers = [ (b":status", b"100"), (b"server", b"fake-serv/0.1.0"), ] example_response_headers = [ (b":status", b"200"), (b"server", b"fake-serv/0.1.0"), ] example_trailers = [ (b"trailer", b"you-bet"), ] server_config = h2.config.H2Configuration(client_side=False) @pytest.mark.parametrize( "hdrs", [informational_headers, bytes_informational_headers], ) @pytest.mark.parametrize( "request_headers", [example_request_headers, bytes_example_request_headers], ) @pytest.mark.parametrize("end_stream", [True, False]) def test_single_informational_response(self, frame_factory, hdrs, request_headers, end_stream) -> None: """ When sending a informational response, the appropriate frames are emitted. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) flags = ["END_STREAM"] if end_stream else [] f = frame_factory.build_headers_frame( headers=request_headers, stream_id=1, flags=flags, ) c.receive_data(f.serialize()) c.clear_outbound_data_buffer() frame_factory.refresh_encoder() c.send_headers( stream_id=1, headers=hdrs, ) f = frame_factory.build_headers_frame( headers=hdrs, stream_id=1, ) assert c.data_to_send() == f.serialize() @pytest.mark.parametrize( "hdrs", [informational_headers, bytes_informational_headers], ) @pytest.mark.parametrize( "request_headers", [example_request_headers, bytes_example_request_headers], ) @pytest.mark.parametrize("end_stream", [True, False]) def test_sending_multiple_header_blocks(self, frame_factory, hdrs, request_headers, end_stream) -> None: """ At least three header blocks can be sent: informational, headers, trailers. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) flags = ["END_STREAM"] if end_stream else [] f = frame_factory.build_headers_frame( headers=request_headers, stream_id=1, flags=flags, ) c.receive_data(f.serialize()) c.clear_outbound_data_buffer() frame_factory.refresh_encoder() # Send the three header blocks. c.send_headers( stream_id=1, headers=hdrs, ) c.send_headers( stream_id=1, headers=self.example_response_headers, ) c.send_headers( stream_id=1, headers=self.example_trailers, end_stream=True, ) # Check that we sent them properly. f1 = frame_factory.build_headers_frame( headers=hdrs, stream_id=1, ) f2 = frame_factory.build_headers_frame( headers=self.example_response_headers, stream_id=1, ) f3 = frame_factory.build_headers_frame( headers=self.example_trailers, stream_id=1, flags=["END_STREAM"], ) assert ( c.data_to_send() == f1.serialize() + f2.serialize() + f3.serialize() ) @pytest.mark.parametrize( "hdrs", [informational_headers, bytes_informational_headers], ) @pytest.mark.parametrize( "request_headers", [example_request_headers, bytes_example_request_headers], ) @pytest.mark.parametrize("end_stream", [True, False]) def test_sending_multiple_informational_responses(self, frame_factory, hdrs, request_headers, end_stream) -> None: """ More than one informational response is allowed. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) flags = ["END_STREAM"] if end_stream else [] f = frame_factory.build_headers_frame( headers=request_headers, stream_id=1, flags=flags, ) c.receive_data(f.serialize()) c.clear_outbound_data_buffer() frame_factory.refresh_encoder() # Send two informational responses. c.send_headers( stream_id=1, headers=hdrs, ) c.send_headers( stream_id=1, headers=[(b":status", b"101")], ) # Check we sent them both. f1 = frame_factory.build_headers_frame( headers=hdrs, stream_id=1, ) f2 = frame_factory.build_headers_frame( headers=[(":status", "101")], stream_id=1, ) assert c.data_to_send() == f1.serialize() + f2.serialize() @pytest.mark.parametrize( "hdrs", [informational_headers, bytes_informational_headers], ) @pytest.mark.parametrize( "request_headers", [example_request_headers, bytes_example_request_headers], ) @pytest.mark.parametrize("end_stream", [True, False]) def test_send_provisional_response_with_end_stream(self, frame_factory, hdrs, request_headers, end_stream) -> None: """ Sending provisional responses with END_STREAM set causes ProtocolErrors. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) flags = ["END_STREAM"] if end_stream else [] f = frame_factory.build_headers_frame( headers=request_headers, stream_id=1, flags=flags, ) c.receive_data(f.serialize()) with pytest.raises(h2.exceptions.ProtocolError): c.send_headers( stream_id=1, headers=hdrs, end_stream=True, ) @pytest.mark.parametrize( "hdrs", [informational_headers, bytes_informational_headers], ) @pytest.mark.parametrize( "request_headers", [example_request_headers, bytes_example_request_headers], ) @pytest.mark.parametrize("end_stream", [True, False]) def test_reject_sending_out_of_order_headers(self, frame_factory, hdrs, request_headers, end_stream) -> None: """ When sending an informational response after the actual response headers we consider it a ProtocolError and raise it. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) flags = ["END_STREAM"] if end_stream else [] f = frame_factory.build_headers_frame( headers=request_headers, stream_id=1, flags=flags, ) c.receive_data(f.serialize()) c.send_headers( stream_id=1, headers=self.example_response_headers, ) with pytest.raises(h2.exceptions.ProtocolError): c.send_headers( stream_id=1, headers=hdrs, ) ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/test_interacting_stacks.py0000644000076500000240000001063214744265074020040 0ustar00kriechistaff""" These tests run two entities, a client and a server, in parallel threads. These two entities talk to each other, running what amounts to a number of carefully controlled simulations of real flows. This is to ensure that the stack as a whole behaves intelligently in both client and server cases. These tests are long, complex, and somewhat brittle, so they aren't in general recommended for writing the majority of test cases. Their purposes is primarily to validate that the top-level API of the library behaves as described. We should also consider writing helper functions to reduce the complexity of these tests, so that they can be written more easily, as they are remarkably useful. """ from __future__ import annotations import pytest import h2.config import h2.connection import h2.events import h2.settings from . import coroutine_tests class TestCommunication(coroutine_tests.CoroutineTestCase): """ Test that two communicating state machines can work together. """ server_config = h2.config.H2Configuration(client_side=False) request_headers = [ (":method", "GET"), (":path", "/"), (":authority", "example.com"), (":scheme", "https"), ("user-agent", "test-client/0.1.0"), ] request_headers_bytes = [ (b":method", b"GET"), (b":path", b"/"), (b":authority", b"example.com"), (b":scheme", b"https"), (b"user-agent", b"test-client/0.1.0"), ] response_headers = [ (b":status", b"204"), (b"server", b"test-server/0.1.0"), (b"content-length", b"0"), ] @pytest.mark.parametrize("request_headers", [request_headers, request_headers_bytes]) def test_basic_request_response(self, request_headers) -> None: """ A request issued by hyper-h2 can be responded to by hyper-h2. """ def client(): c = h2.connection.H2Connection() # Do the handshake. First send the preamble. c.initiate_connection() data = yield c.data_to_send() # Next, handle the remote preamble. events = c.receive_data(data) assert len(events) == 2 assert isinstance(events[0], h2.events.SettingsAcknowledged) assert isinstance(events[1], h2.events.RemoteSettingsChanged) changed = events[1].changed_settings assert ( changed[ h2.settings.SettingCodes.MAX_CONCURRENT_STREAMS ].new_value == 100 ) # Send a request. events = c.send_headers(1, request_headers, end_stream=True) assert not events data = yield c.data_to_send() # Validate the response. events = c.receive_data(data) assert len(events) == 2 assert isinstance(events[0], h2.events.ResponseReceived) assert events[0].stream_id == 1 assert events[0].headers == self.response_headers assert isinstance(events[1], h2.events.StreamEnded) assert events[1].stream_id == 1 @self.server def server(): c = h2.connection.H2Connection(config=self.server_config) # First, read for the preamble. data = yield events = c.receive_data(data) assert len(events) == 1 assert isinstance(events[0], h2.events.RemoteSettingsChanged) changed = events[0].changed_settings assert ( changed[ h2.settings.SettingCodes.MAX_CONCURRENT_STREAMS ].new_value == 100 ) # Send our preamble back. c.initiate_connection() data = yield c.data_to_send() # Listen for the request. events = c.receive_data(data) assert len(events) == 3 assert isinstance(events[0], h2.events.SettingsAcknowledged) assert isinstance(events[1], h2.events.RequestReceived) assert events[1].stream_id == 1 assert events[1].headers == self.request_headers_bytes assert isinstance(events[2], h2.events.StreamEnded) assert events[2].stream_id == 1 # Send our response. events = c.send_headers(1, self.response_headers, end_stream=True) assert not events yield c.data_to_send() self.run_until_complete(client(), server()) ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/test_invalid_content_lengths.py0000644000076500000240000001207514744265074021070 0ustar00kriechistaff""" This module contains tests that use invalid content lengths, and validates that they fail appropriately. """ from __future__ import annotations import pytest import h2.config import h2.connection import h2.errors import h2.events import h2.exceptions class TestInvalidContentLengths: """ Hyper-h2 raises Protocol Errors when the content-length sent by a remote peer is not valid. """ example_request_headers = [ (":authority", "example.com"), (":path", "/"), (":scheme", "https"), (":method", "POST"), ("content-length", "15"), ] example_request_headers_bytes = [ (b":authority", b"example.com"), (b":path", b"/"), (b":scheme", b"https"), (b":method", b"POST"), (b"content-length", b"15"), ] example_response_headers = [ (":status", "200"), ("server", "fake-serv/0.1.0"), ] server_config = h2.config.H2Configuration(client_side=False) @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_too_much_data(self, frame_factory, request_headers) -> None: """ Remote peers sending data in excess of content-length causes Protocol Errors. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) headers = frame_factory.build_headers_frame( headers=request_headers, ) first_data = frame_factory.build_data_frame(data=b"\x01"*15) c.receive_data(headers.serialize() + first_data.serialize()) c.clear_outbound_data_buffer() second_data = frame_factory.build_data_frame(data=b"\x01") with pytest.raises(h2.exceptions.InvalidBodyLengthError) as exp: c.receive_data(second_data.serialize()) assert exp.value.expected_length == 15 assert exp.value.actual_length == 16 assert str(exp.value) == ( "InvalidBodyLengthError: Expected 15 bytes, received 16" ) expected_frame = frame_factory.build_goaway_frame( last_stream_id=1, error_code=h2.errors.ErrorCodes.PROTOCOL_ERROR, ) assert c.data_to_send() == expected_frame.serialize() @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_insufficient_data(self, frame_factory, request_headers) -> None: """ Remote peers sending less data than content-length causes Protocol Errors. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) headers = frame_factory.build_headers_frame( headers=request_headers, ) first_data = frame_factory.build_data_frame(data=b"\x01"*13) c.receive_data(headers.serialize() + first_data.serialize()) c.clear_outbound_data_buffer() second_data = frame_factory.build_data_frame( data=b"\x01", flags=["END_STREAM"], ) with pytest.raises(h2.exceptions.InvalidBodyLengthError) as exp: c.receive_data(second_data.serialize()) assert exp.value.expected_length == 15 assert exp.value.actual_length == 14 assert str(exp.value) == ( "InvalidBodyLengthError: Expected 15 bytes, received 14" ) expected_frame = frame_factory.build_goaway_frame( last_stream_id=1, error_code=h2.errors.ErrorCodes.PROTOCOL_ERROR, ) assert c.data_to_send() == expected_frame.serialize() @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_insufficient_data_empty_frame(self, frame_factory, request_headers) -> None: """ Remote peers sending less data than content-length where the last data frame is empty causes Protocol Errors. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) headers = frame_factory.build_headers_frame( headers=request_headers, ) first_data = frame_factory.build_data_frame(data=b"\x01"*14) c.receive_data(headers.serialize() + first_data.serialize()) c.clear_outbound_data_buffer() second_data = frame_factory.build_data_frame( data=b"", flags=["END_STREAM"], ) with pytest.raises(h2.exceptions.InvalidBodyLengthError) as exp: c.receive_data(second_data.serialize()) assert exp.value.expected_length == 15 assert exp.value.actual_length == 14 assert str(exp.value) == ( "InvalidBodyLengthError: Expected 15 bytes, received 14" ) expected_frame = frame_factory.build_goaway_frame( last_stream_id=1, error_code=h2.errors.ErrorCodes.PROTOCOL_ERROR, ) assert c.data_to_send() == expected_frame.serialize() ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/test_invalid_frame_sequences.py0000644000076500000240000004611714744265074021043 0ustar00kriechistaff""" Tests invalid frame sequences, and validates that they fail appropriately. """ from __future__ import annotations import pytest import h2.config import h2.connection import h2.errors import h2.events import h2.exceptions class TestInvalidFrameSequences: """ Invalid frame sequences, either sent or received, cause ProtocolErrors to be thrown. """ example_request_headers = [ (":authority", "example.com"), (":path", "/"), (":scheme", "https"), (":method", "GET"), ] example_request_headers_bytes = [ (b":authority", b"example.com"), (b":path", b"/"), (b":scheme", b"https"), (b":method", b"GET"), ] example_response_headers = [ (":status", "200"), ("server", "fake-serv/0.1.0"), ] server_config = h2.config.H2Configuration(client_side=False) client_config = h2.config.H2Configuration(client_side=True) @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_cannot_send_on_closed_stream(self, request_headers) -> None: """ When we've closed a stream locally, we cannot send further data. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(1, request_headers, end_stream=True) with pytest.raises(h2.exceptions.ProtocolError): c.send_data(1, b"some data") def test_missing_preamble_errors(self) -> None: """ Server side connections require the preamble. """ c = h2.connection.H2Connection(config=self.server_config) encoded_headers_frame = ( b"\x00\x00\r\x01\x04\x00\x00\x00\x01" b"A\x88/\x91\xd3]\x05\\\x87\xa7\x84\x87\x82" ) with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(encoded_headers_frame) @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_server_connections_reject_even_streams(self, frame_factory, request_headers) -> None: """ Servers do not allow clients to initiate even-numbered streams. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame( request_headers, stream_id=2, ) with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(f.serialize()) @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_clients_reject_odd_stream_pushes(self, frame_factory, request_headers) -> None: """ Clients do not allow servers to push odd numbered streams. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(1, request_headers, end_stream=True) f = frame_factory.build_push_promise_frame( stream_id=1, headers=request_headers, promised_stream_id=3, ) with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(f.serialize()) @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_can_handle_frames_with_invalid_padding(self, frame_factory, request_headers) -> None: """ Frames with invalid padding cause connection teardown. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame(request_headers) c.receive_data(f.serialize()) c.clear_outbound_data_buffer() invalid_data_frame = ( b"\x00\x00\x05\x00\x0b\x00\x00\x00\x01\x06\x54\x65\x73\x74" ) with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(invalid_data_frame) expected_frame = frame_factory.build_goaway_frame( last_stream_id=1, error_code=1, ) assert c.data_to_send() == expected_frame.serialize() def test_receiving_frames_with_insufficent_size(self, frame_factory) -> None: """ Frames with not enough data cause connection teardown. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() invalid_window_update_frame = ( b"\x00\x00\x03\x08\x00\x00\x00\x00\x00\x00\x00\x02" ) with pytest.raises(h2.exceptions.FrameDataMissingError): c.receive_data(invalid_window_update_frame) expected_frame = frame_factory.build_goaway_frame( last_stream_id=0, error_code=h2.errors.ErrorCodes.FRAME_SIZE_ERROR, ) assert c.data_to_send() == expected_frame.serialize() @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_reject_data_on_closed_streams(self, frame_factory, request_headers) -> None: """ When a stream is not open to the remote peer, we reject receiving data frames from them. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame( request_headers, flags=["END_STREAM"], ) c.receive_data(f.serialize()) c.clear_outbound_data_buffer() bad_frame = frame_factory.build_data_frame( data=b"some data", ) c.receive_data(bad_frame.serialize()) expected = frame_factory.build_rst_stream_frame( stream_id=1, error_code=h2.errors.ErrorCodes.STREAM_CLOSED, ).serialize() assert c.data_to_send() == expected @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_unexpected_continuation_on_closed_stream(self, frame_factory, request_headers) -> None: """ CONTINUATION frames received on closed streams cause connection errors of type PROTOCOL_ERROR. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame( request_headers, flags=["END_STREAM"], ) c.receive_data(f.serialize()) c.clear_outbound_data_buffer() bad_frame = frame_factory.build_continuation_frame( header_block=b"hello", ) with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(bad_frame.serialize()) expected_frame = frame_factory.build_goaway_frame( error_code=h2.errors.ErrorCodes.PROTOCOL_ERROR, last_stream_id=1, ) assert c.data_to_send() == expected_frame.serialize() @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_prevent_continuation_dos(self, frame_factory, request_headers) -> None: """ Receiving too many CONTINUATION frames in one block causes a protocol error. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame( request_headers, ) f.flags = {"END_STREAM"} c.receive_data(f.serialize()) c.clear_outbound_data_buffer() # Send 63 additional frames. for _ in range(63): extra_frame = frame_factory.build_continuation_frame( header_block=b"hello", ) c.receive_data(extra_frame.serialize()) # The final continuation frame should cause a protocol error. extra_frame = frame_factory.build_continuation_frame( header_block=b"hello", ) with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(extra_frame.serialize()) expected_frame = frame_factory.build_goaway_frame( last_stream_id=0, error_code=0x1, ) assert c.data_to_send() == expected_frame.serialize() # These settings are a bit annoyingly anonymous, but trust me, they're bad. @pytest.mark.parametrize( "settings", [ {0x2: 5}, {0x4: 2**31}, {0x5: 5}, {0x5: 2**24}, ], ) def test_reject_invalid_settings_values(self, frame_factory, settings) -> None: """ When a SETTINGS frame is received with invalid settings values it causes connection teardown with the appropriate error code. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) f = frame_factory.build_settings_frame(settings=settings) with pytest.raises(h2.exceptions.InvalidSettingsValueError) as e: c.receive_data(f.serialize()) assert e.value.error_code == ( h2.errors.ErrorCodes.FLOW_CONTROL_ERROR if 0x4 in settings else h2.errors.ErrorCodes.PROTOCOL_ERROR ) @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_invalid_frame_headers_are_protocol_errors(self, frame_factory, request_headers) -> None: """ When invalid frame headers are received they cause ProtocolErrors to be raised. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame( headers=request_headers, ) # Do some annoying bit twiddling here: the stream ID is currently set # to '1', change it to '0'. Grab the first 9 bytes (the frame header), # replace any instances of the byte '\x01', and then graft it onto the # remaining bytes. frame_data = f.serialize() frame_data = frame_data[:9].replace(b"\x01", b"\x00") + frame_data[9:] with pytest.raises(h2.exceptions.ProtocolError) as e: c.receive_data(frame_data) assert "Received frame with invalid header" in str(e.value) @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_data_before_headers(self, frame_factory, request_headers) -> None: """ When data frames are received before headers they cause ProtocolErrors to be raised. """ c = h2.connection.H2Connection(config=self.client_config) c.initiate_connection() # transition stream into OPEN c.send_headers(1, request_headers) f = frame_factory.build_data_frame(b"hello") with pytest.raises(h2.exceptions.ProtocolError) as e: c.receive_data(f.serialize()) assert "cannot receive data before headers" in str(e.value) @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_get_stream_reset_event_on_auto_reset(self, frame_factory, request_headers) -> None: """ When hyper-h2 resets a stream automatically, a StreamReset event fires. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame( request_headers, flags=["END_STREAM"], ) c.receive_data(f.serialize()) c.clear_outbound_data_buffer() bad_frame = frame_factory.build_data_frame( data=b"some data", ) events = c.receive_data(bad_frame.serialize()) expected = frame_factory.build_rst_stream_frame( stream_id=1, error_code=h2.errors.ErrorCodes.STREAM_CLOSED, ).serialize() assert c.data_to_send() == expected assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.StreamReset) assert event.stream_id == 1 assert event.error_code == h2.errors.ErrorCodes.STREAM_CLOSED assert not event.remote_reset @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_one_one_stream_reset(self, frame_factory, request_headers) -> None: """ When hyper-h2 resets a stream automatically, a StreamReset event fires, but only for the first reset: the others are silent. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame( request_headers, flags=["END_STREAM"], ) c.receive_data(f.serialize()) c.clear_outbound_data_buffer() bad_frame = frame_factory.build_data_frame( data=b"some data", ) # Receive 5 frames. events = c.receive_data(bad_frame.serialize() * 5) expected = frame_factory.build_rst_stream_frame( stream_id=1, error_code=h2.errors.ErrorCodes.STREAM_CLOSED, ).serialize() assert c.data_to_send() == expected * 5 assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.StreamReset) assert event.stream_id == 1 assert event.error_code == h2.errors.ErrorCodes.STREAM_CLOSED assert not event.remote_reset @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) @pytest.mark.parametrize("value", ["", "twelve"]) def test_error_on_invalid_content_length(self, frame_factory, value, request_headers) -> None: """ When an invalid content-length is received, a ProtocolError is thrown. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() f = frame_factory.build_headers_frame( stream_id=1, headers=[*request_headers, ("content-length", value)], ) with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(f.serialize()) expected_frame = frame_factory.build_goaway_frame( last_stream_id=1, error_code=h2.errors.ErrorCodes.PROTOCOL_ERROR, ) assert c.data_to_send() == expected_frame.serialize() @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_invalid_header_data_protocol_error(self, frame_factory, request_headers) -> None: """ If an invalid header block is received, we raise a ProtocolError. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() f = frame_factory.build_headers_frame( stream_id=1, headers=request_headers, ) f.data = b"\x00\x00\x00\x00" with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(f.serialize()) expected_frame = frame_factory.build_goaway_frame( last_stream_id=0, error_code=h2.errors.ErrorCodes.PROTOCOL_ERROR, ) assert c.data_to_send() == expected_frame.serialize() @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_invalid_push_promise_data_protocol_error(self, frame_factory, request_headers) -> None: """ If an invalid header block is received on a PUSH_PROMISE, we raise a ProtocolError. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=request_headers) c.clear_outbound_data_buffer() f = frame_factory.build_push_promise_frame( stream_id=1, promised_stream_id=2, headers=request_headers, ) f.data = b"\x00\x00\x00\x00" with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(f.serialize()) expected_frame = frame_factory.build_goaway_frame( last_stream_id=0, error_code=h2.errors.ErrorCodes.PROTOCOL_ERROR, ) assert c.data_to_send() == expected_frame.serialize() @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_cannot_receive_push_on_pushed_stream(self, frame_factory, request_headers) -> None: """ If a PUSH_PROMISE frame is received with the parent stream ID being a pushed stream, this is rejected with a PROTOCOL_ERROR. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers( stream_id=1, headers=request_headers, end_stream=True, ) f1 = frame_factory.build_push_promise_frame( stream_id=1, promised_stream_id=2, headers=request_headers, ) f2 = frame_factory.build_headers_frame( stream_id=2, headers=self.example_response_headers, ) c.receive_data(f1.serialize() + f2.serialize()) c.clear_outbound_data_buffer() f = frame_factory.build_push_promise_frame( stream_id=2, promised_stream_id=4, headers=request_headers, ) with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(f.serialize()) expected_frame = frame_factory.build_goaway_frame( last_stream_id=2, error_code=h2.errors.ErrorCodes.PROTOCOL_ERROR, ) assert c.data_to_send() == expected_frame.serialize() @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_cannot_send_push_on_pushed_stream(self, frame_factory, request_headers) -> None: """ If a user tries to send a PUSH_PROMISE frame with the parent stream ID being a pushed stream, this is rejected with a PROTOCOL_ERROR. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame( stream_id=1, headers=request_headers, ) c.receive_data(f.serialize()) c.push_stream( stream_id=1, promised_stream_id=2, request_headers=request_headers, ) c.send_headers(stream_id=2, headers=self.example_response_headers) with pytest.raises(h2.exceptions.ProtocolError): c.push_stream( stream_id=2, promised_stream_id=4, request_headers=request_headers, ) ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/test_invalid_headers.py0000644000076500000240000010341514744265074017304 0ustar00kriechistaff""" Tests invalid header blocks, and validates that they fail appropriately. """ from __future__ import annotations import itertools import hyperframe.frame import pytest from hypothesis import given from hypothesis.strategies import binary, lists, tuples import h2.config import h2.connection import h2.errors import h2.events import h2.exceptions import h2.settings import h2.utilities HEADERS_STRATEGY = lists(tuples(binary(min_size=1), binary())) class TestInvalidFrameSequences: """ Invalid header sequences cause ProtocolErrors to be thrown when received. """ base_request_headers = [ (":authority", "example.com"), (":path", "/"), (":scheme", "https"), (":method", "GET"), ("user-agent", "someua/0.0.1"), ] base_invalid_header_blocks = [ [*base_request_headers, ("Uppercase", "name")], [*base_request_headers, (":late", "pseudo-header")], [(":path", "duplicate-pseudo-header"), *base_request_headers], [*base_request_headers, ("connection", "close")], [*base_request_headers, ("proxy-connection", "close")], [*base_request_headers, ("keep-alive", "close")], [*base_request_headers, ("transfer-encoding", "gzip")], [*base_request_headers, ("upgrade", "super-protocol/1.1")], [*base_request_headers, ("te", "chunked")], [*base_request_headers, ("host", "notexample.com")], [*base_request_headers, (" name", "name with leading space")], [*base_request_headers, ("name ", "name with trailing space")], [*base_request_headers, ("name", " value with leading space")], [*base_request_headers, ("name", "value with trailing space ")], [header for header in base_request_headers if header[0] != ":authority"], [(":protocol", "websocket"), *base_request_headers], ] invalid_header_blocks = base_invalid_header_blocks + [ h2.utilities.utf8_encode_headers(headers) for headers in base_invalid_header_blocks ] server_config = h2.config.H2Configuration( client_side=False, header_encoding="utf-8", ) @pytest.mark.parametrize("headers", invalid_header_blocks) def test_headers_event(self, frame_factory, headers) -> None: """ Test invalid headers are rejected with PROTOCOL_ERROR. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() f = frame_factory.build_headers_frame(headers) data = f.serialize() with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(data) expected_frame = frame_factory.build_goaway_frame( last_stream_id=1, error_code=h2.errors.ErrorCodes.PROTOCOL_ERROR, ) assert c.data_to_send() == expected_frame.serialize() @pytest.mark.parametrize("headers", invalid_header_blocks) def test_push_promise_event(self, frame_factory, headers) -> None: """ If a PUSH_PROMISE header frame is received with an invalid header block it is rejected with a PROTOCOL_ERROR. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers( stream_id=1, headers=self.base_request_headers, end_stream=True, ) c.clear_outbound_data_buffer() f = frame_factory.build_push_promise_frame( stream_id=1, promised_stream_id=2, headers=headers, ) data = f.serialize() with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(data) expected_frame = frame_factory.build_goaway_frame( last_stream_id=0, error_code=h2.errors.ErrorCodes.PROTOCOL_ERROR, ) assert c.data_to_send() == expected_frame.serialize() @pytest.mark.parametrize("headers", invalid_header_blocks) def test_push_promise_skipping_validation(self, frame_factory, headers) -> None: """ If we have ``validate_inbound_headers`` disabled, then invalid header blocks in push promise frames are allowed to pass. """ config = h2.config.H2Configuration( client_side=True, validate_inbound_headers=False, ) c = h2.connection.H2Connection(config=config) c.initiate_connection() c.send_headers( stream_id=1, headers=self.base_request_headers, end_stream=True, ) c.clear_outbound_data_buffer() f = frame_factory.build_push_promise_frame( stream_id=1, promised_stream_id=2, headers=headers, ) data = f.serialize() events = c.receive_data(data) assert len(events) == 1 pp_event = events[0] assert pp_event.headers == h2.utilities.utf8_encode_headers(headers) @pytest.mark.parametrize("headers", invalid_header_blocks) def test_headers_event_skipping_validation(self, frame_factory, headers) -> None: """ If we have ``validate_inbound_headers`` disabled, then all of these invalid header blocks are allowed to pass. """ config = h2.config.H2Configuration( client_side=False, validate_inbound_headers=False, ) c = h2.connection.H2Connection(config=config) c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame(headers) data = f.serialize() events = c.receive_data(data) assert len(events) == 1 request_event = events[0] assert request_event.headers == h2.utilities.utf8_encode_headers(headers) def test_te_trailers_is_valid(self, frame_factory) -> None: """ `te: trailers` is allowed by the filter. """ headers = ( [*self.base_request_headers, ("te", "trailers")] ) c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame(headers) data = f.serialize() events = c.receive_data(data) assert len(events) == 1 request_event = events[0] assert request_event.headers == headers def test_pseudo_headers_rejected_in_trailer(self, frame_factory) -> None: """ Ensure we reject pseudo headers included in trailers """ trailers = [(":path", "/"), ("extra", "value")] c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() header_frame = frame_factory.build_headers_frame( self.base_request_headers, ) trailer_frame = frame_factory.build_headers_frame( trailers, flags=["END_STREAM"], ) head = header_frame.serialize() trailer = trailer_frame.serialize() c.receive_data(head) # Raise exception if pseudo header in trailer with pytest.raises(h2.exceptions.ProtocolError) as e: c.receive_data(trailer) assert "pseudo-header in trailer" in str(e.value) # Test appropriate response frame is generated expected_frame = frame_factory.build_goaway_frame( last_stream_id=1, error_code=h2.errors.ErrorCodes.PROTOCOL_ERROR, ) assert c.data_to_send() == expected_frame.serialize() class TestSendingInvalidFrameSequences: """ Trying to send invalid header sequences cause ProtocolErrors to be thrown. """ base_request_headers = [ (":authority", "example.com"), (":path", "/"), (":scheme", "https"), (":method", "GET"), ("user-agent", "someua/0.0.1"), ] invalid_header_blocks = [ [*base_request_headers, (":late", "pseudo-header")], [(":path", "duplicate-pseudo-header"), *base_request_headers], [*base_request_headers, ("te", "chunked")], [*base_request_headers, ("host", "notexample.com")], [header for header in base_request_headers if header[0] != ":authority"], ] strippable_header_blocks = [ [*base_request_headers, ("connection", "close")], [*base_request_headers, ("proxy-connection", "close")], [*base_request_headers, ("keep-alive", "close")], [*base_request_headers, ("transfer-encoding", "gzip")], [*base_request_headers, ("upgrade", "super-protocol/1.1")], ] all_header_blocks = invalid_header_blocks + strippable_header_blocks server_config = h2.config.H2Configuration(client_side=False) @pytest.mark.parametrize("headers", invalid_header_blocks) def test_headers_event(self, frame_factory, headers) -> None: """ Test sending invalid headers raise a ProtocolError. """ c = h2.connection.H2Connection() c.initiate_connection() # Clear the data, then try to send headers. c.clear_outbound_data_buffer() with pytest.raises(h2.exceptions.ProtocolError): c.send_headers(1, headers) @pytest.mark.parametrize("headers", invalid_header_blocks) def test_send_push_promise(self, frame_factory, headers) -> None: """ Sending invalid headers in a push promise raises a ProtocolError. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) header_frame = frame_factory.build_headers_frame( self.base_request_headers, ) c.receive_data(header_frame.serialize()) # Clear the data, then try to send a push promise. c.clear_outbound_data_buffer() with pytest.raises(h2.exceptions.ProtocolError): c.push_stream( stream_id=1, promised_stream_id=2, request_headers=headers, ) @pytest.mark.parametrize("headers", all_header_blocks) def test_headers_event_skipping_validation(self, frame_factory, headers) -> None: """ If we have ``validate_outbound_headers`` disabled, then all of these invalid header blocks are allowed to pass. """ config = h2.config.H2Configuration( validate_outbound_headers=False, ) c = h2.connection.H2Connection(config=config) c.initiate_connection() # Clear the data, then send headers. c.clear_outbound_data_buffer() c.send_headers(1, headers) # Ensure headers are still normalized. headers = h2.utilities.utf8_encode_headers(headers) norm_headers = h2.utilities.normalize_outbound_headers( headers, None, False, ) f = frame_factory.build_headers_frame(norm_headers) assert c.data_to_send() == f.serialize() @pytest.mark.parametrize("headers", all_header_blocks) def test_push_promise_skipping_validation(self, frame_factory, headers) -> None: """ If we have ``validate_outbound_headers`` disabled, then all of these invalid header blocks are allowed to pass. """ config = h2.config.H2Configuration( client_side=False, validate_outbound_headers=False, ) c = h2.connection.H2Connection(config=config) c.initiate_connection() c.receive_data(frame_factory.preamble()) header_frame = frame_factory.build_headers_frame( self.base_request_headers, ) c.receive_data(header_frame.serialize()) frame_factory.refresh_encoder() # Create push promise frame with normalized headers. headers = h2.utilities.utf8_encode_headers(headers) norm_headers = h2.utilities.normalize_outbound_headers( headers, None, False, ) pp_frame = frame_factory.build_push_promise_frame( stream_id=1, promised_stream_id=2, headers=norm_headers, ) # Clear the data, then send a push promise. c.clear_outbound_data_buffer() c.push_stream( stream_id=1, promised_stream_id=2, request_headers=headers, ) assert c.data_to_send() == pp_frame.serialize() @pytest.mark.parametrize("headers", all_header_blocks) def test_headers_event_skip_normalization(self, frame_factory, headers) -> None: """ If we have ``normalize_outbound_headers`` disabled, then all of these invalid header blocks are sent through unmodified. """ config = h2.config.H2Configuration( validate_outbound_headers=False, normalize_outbound_headers=False, ) c = h2.connection.H2Connection(config=config) c.initiate_connection() f = frame_factory.build_headers_frame( headers, stream_id=1, ) # Clear the data, then send headers. c.clear_outbound_data_buffer() c.send_headers(1, headers) assert c.data_to_send() == f.serialize() @pytest.mark.parametrize("headers", all_header_blocks) def test_push_promise_skip_normalization(self, frame_factory, headers) -> None: """ If we have ``normalize_outbound_headers`` disabled, then all of these invalid header blocks are allowed to pass unmodified. """ config = h2.config.H2Configuration( client_side=False, validate_outbound_headers=False, normalize_outbound_headers=False, ) c = h2.connection.H2Connection(config=config) c.initiate_connection() c.receive_data(frame_factory.preamble()) header_frame = frame_factory.build_headers_frame( self.base_request_headers, ) c.receive_data(header_frame.serialize()) frame_factory.refresh_encoder() pp_frame = frame_factory.build_push_promise_frame( stream_id=1, promised_stream_id=2, headers=headers, ) # Clear the data, then send a push promise. c.clear_outbound_data_buffer() c.push_stream( stream_id=1, promised_stream_id=2, request_headers=headers, ) assert c.data_to_send() == pp_frame.serialize() @pytest.mark.parametrize("headers", strippable_header_blocks) def test_strippable_headers(self, frame_factory, headers) -> None: """ Test connection related headers are removed before sending. """ c = h2.connection.H2Connection() c.initiate_connection() # Clear the data, then try to send headers. c.clear_outbound_data_buffer() c.send_headers(1, headers) f = frame_factory.build_headers_frame(self.base_request_headers) assert c.data_to_send() == f.serialize() class TestFilter: """ Test the filter function directly. These tests exists to confirm the behaviour of the filter function in a wide range of scenarios. Many of these scenarios may not be legal for HTTP/2 and so may never hit the function, but it's worth validating that it behaves as expected anyway. """ validation_functions = [ h2.utilities.validate_headers, h2.utilities.validate_outbound_headers, ] hdr_validation_combos = [ h2.utilities.HeaderValidationFlags( is_client, is_trailer, is_response_header, is_push_promise, ) for is_client, is_trailer, is_response_header, is_push_promise in ( itertools.product([True, False], repeat=4) ) ] hdr_validation_response_headers = [ flags for flags in hdr_validation_combos if flags.is_response_header ] hdr_validation_request_headers_no_trailer = [ flags for flags in hdr_validation_combos if not (flags.is_trailer or flags.is_response_header) ] invalid_request_header_blocks_bytes = ( # First, missing :method ( (b":authority", b"google.com"), (b":path", b"/"), (b":scheme", b"https"), ), # Next, missing :path ( (b":authority", b"google.com"), (b":method", b"GET"), (b":scheme", b"https"), ), # Next, missing :scheme ( (b":authority", b"google.com"), (b":method", b"GET"), (b":path", b"/"), ), # Finally, path present but empty. ( (b":authority", b"google.com"), (b":method", b"GET"), (b":scheme", b"https"), (b":path", b""), ), ) # All headers that are forbidden from either request or response blocks. forbidden_request_headers_bytes = (b":status",) forbidden_response_headers_bytes = (b":path", b":scheme", b":authority", b":method") @pytest.mark.parametrize("validation_function", validation_functions) @pytest.mark.parametrize("hdr_validation_flags", hdr_validation_combos) @given(headers=HEADERS_STRATEGY) def test_range_of_acceptable_outputs(self, headers, validation_function, hdr_validation_flags) -> None: """ The header validation functions either return the data unchanged or throw a ProtocolError. """ try: assert headers == list(validation_function( headers, hdr_validation_flags)) except h2.exceptions.ProtocolError: assert True @pytest.mark.parametrize("hdr_validation_flags", hdr_validation_combos) def test_invalid_pseudo_headers(self, hdr_validation_flags) -> None: headers = [(b":custom", b"value")] with pytest.raises(h2.exceptions.ProtocolError): list(h2.utilities.validate_headers(headers, hdr_validation_flags)) @pytest.mark.parametrize("validation_function", validation_functions) @pytest.mark.parametrize( "hdr_validation_flags", hdr_validation_request_headers_no_trailer, ) def test_matching_authority_host_headers(self, validation_function, hdr_validation_flags) -> None: """ If a header block has :authority and Host headers and they match, the headers should pass through unchanged. """ headers = [ (b":authority", b"example.com"), (b":path", b"/"), (b":scheme", b"https"), (b":method", b"GET"), (b"host", b"example.com"), ] assert headers == list(h2.utilities.validate_headers( headers, hdr_validation_flags, )) @pytest.mark.parametrize( "hdr_validation_flags", hdr_validation_response_headers, ) def test_response_header_without_status(self, hdr_validation_flags) -> None: headers = [(b"content-length", b"42")] with pytest.raises(h2.exceptions.ProtocolError): list(h2.utilities.validate_headers(headers, hdr_validation_flags)) @pytest.mark.parametrize( "hdr_validation_flags", hdr_validation_request_headers_no_trailer, ) @pytest.mark.parametrize( "header_block", (invalid_request_header_blocks_bytes), ) def test_outbound_req_header_missing_pseudo_headers(self, hdr_validation_flags, header_block) -> None: with pytest.raises(h2.exceptions.ProtocolError): list( h2.utilities.validate_outbound_headers( header_block, hdr_validation_flags, ), ) @pytest.mark.parametrize( "hdr_validation_flags", hdr_validation_request_headers_no_trailer, ) @pytest.mark.parametrize( "header_block", invalid_request_header_blocks_bytes, ) def test_inbound_req_header_missing_pseudo_headers(self, hdr_validation_flags, header_block) -> None: with pytest.raises(h2.exceptions.ProtocolError): list( h2.utilities.validate_headers( header_block, hdr_validation_flags, ), ) @pytest.mark.parametrize( "hdr_validation_flags", hdr_validation_request_headers_no_trailer, ) @pytest.mark.parametrize( "invalid_header", forbidden_request_headers_bytes, ) def test_outbound_req_header_extra_pseudo_headers(self, hdr_validation_flags, invalid_header) -> None: """ Outbound request header blocks containing the forbidden request headers fail validation. """ headers = [ (b":path", b"/"), (b":scheme", b"https"), (b":authority", b"google.com"), (b":method", b"GET"), ] headers.append((invalid_header, b"some value")) with pytest.raises(h2.exceptions.ProtocolError): list( h2.utilities.validate_outbound_headers( headers, hdr_validation_flags, ), ) @pytest.mark.parametrize( "hdr_validation_flags", hdr_validation_request_headers_no_trailer, ) @pytest.mark.parametrize( "invalid_header", forbidden_request_headers_bytes, ) def test_inbound_req_header_extra_pseudo_headers(self, hdr_validation_flags, invalid_header) -> None: """ Inbound request header blocks containing the forbidden request headers fail validation. """ headers = [ (b":path", b"/"), (b":scheme", b"https"), (b":authority", b"google.com"), (b":method", b"GET"), ] headers.append((invalid_header, b"some value")) with pytest.raises(h2.exceptions.ProtocolError): list(h2.utilities.validate_headers(headers, hdr_validation_flags)) @pytest.mark.parametrize( "hdr_validation_flags", hdr_validation_response_headers, ) @pytest.mark.parametrize( "invalid_header", forbidden_response_headers_bytes, ) def test_outbound_resp_header_extra_pseudo_headers(self, hdr_validation_flags, invalid_header) -> None: """ Outbound response header blocks containing the forbidden response headers fail validation. """ headers = [(b":status", b"200")] headers.append((invalid_header, b"some value")) with pytest.raises(h2.exceptions.ProtocolError): list( h2.utilities.validate_outbound_headers( headers, hdr_validation_flags, ), ) @pytest.mark.parametrize( "hdr_validation_flags", hdr_validation_response_headers, ) @pytest.mark.parametrize( "invalid_header", forbidden_response_headers_bytes, ) def test_inbound_resp_header_extra_pseudo_headers(self, hdr_validation_flags, invalid_header) -> None: """ Inbound response header blocks containing the forbidden response headers fail validation. """ headers = [(b":status", b"200")] headers.append((invalid_header, b"some value")) with pytest.raises(h2.exceptions.ProtocolError): list(h2.utilities.validate_headers(headers, hdr_validation_flags)) @pytest.mark.parametrize("hdr_validation_flags", hdr_validation_combos) def test_inbound_header_name_length(self, hdr_validation_flags) -> None: with pytest.raises(h2.exceptions.ProtocolError): list(h2.utilities.validate_headers([(b"", b"foobar")], hdr_validation_flags)) def test_inbound_header_name_length_full_frame_decode(self, frame_factory) -> None: f = frame_factory.build_headers_frame([]) f.data = b"\x00\x00\x05\x00\x00\x00\x00\x04" data = f.serialize() c = h2.connection.H2Connection(config=h2.config.H2Configuration(client_side=False)) c.initiate_connection() c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() with pytest.raises(h2.exceptions.ProtocolError, match="Received header name with zero length."): c.receive_data(data) class TestOversizedHeaders: """ Tests that oversized header blocks are correctly rejected. This replicates the "HPACK Bomb" attack, and confirms that we're resistant against it. """ request_header_block = [ (b":method", b"GET"), (b":authority", b"example.com"), (b":scheme", b"https"), (b":path", b"/"), ] response_header_block = [ (b":status", b"200"), ] # The first header block contains a single header that fills the header # table. To do that, we'll give it a single-character header name and a # 4063 byte header value. This will make it exactly the size of the header # table. It must come last, so that it evicts all other headers. # This block must be appended to either a request or response block. first_header_block = [ (b"a", b"a" * 4063), ] # The second header "block" is actually a custom HEADERS frame body that # simply repeatedly refers to the first entry for 16kB. Each byte has the # high bit set (0x80), and then uses the remaining 7 bits to encode the # number 62 (0x3e), leading to a repeat of the byte 0xbe. second_header_block = b"\xbe" * 2**14 server_config = h2.config.H2Configuration(client_side=False) def test_hpack_bomb_request(self, frame_factory) -> None: """ A HPACK bomb request causes the connection to be torn down with the error code ENHANCE_YOUR_CALM. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() f = frame_factory.build_headers_frame( self.request_header_block + self.first_header_block, ) data = f.serialize() c.receive_data(data) # Build the attack payload. attack_frame = hyperframe.frame.HeadersFrame(stream_id=3) attack_frame.data = self.second_header_block attack_frame.flags.add("END_HEADERS") data = attack_frame.serialize() with pytest.raises(h2.exceptions.DenialOfServiceError): c.receive_data(data) expected_frame = frame_factory.build_goaway_frame( last_stream_id=1, error_code=h2.errors.ErrorCodes.ENHANCE_YOUR_CALM, ) assert c.data_to_send() == expected_frame.serialize() def test_hpack_bomb_response(self, frame_factory) -> None: """ A HPACK bomb response causes the connection to be torn down with the error code ENHANCE_YOUR_CALM. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers( stream_id=1, headers=self.request_header_block, ) c.send_headers( stream_id=3, headers=self.request_header_block, ) c.clear_outbound_data_buffer() f = frame_factory.build_headers_frame( self.response_header_block + self.first_header_block, ) data = f.serialize() c.receive_data(data) # Build the attack payload. attack_frame = hyperframe.frame.HeadersFrame(stream_id=3) attack_frame.data = self.second_header_block attack_frame.flags.add("END_HEADERS") data = attack_frame.serialize() with pytest.raises(h2.exceptions.DenialOfServiceError): c.receive_data(data) expected_frame = frame_factory.build_goaway_frame( last_stream_id=0, error_code=h2.errors.ErrorCodes.ENHANCE_YOUR_CALM, ) assert c.data_to_send() == expected_frame.serialize() def test_hpack_bomb_push(self, frame_factory) -> None: """ A HPACK bomb push causes the connection to be torn down with the error code ENHANCE_YOUR_CALM. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers( stream_id=1, headers=self.request_header_block, ) c.clear_outbound_data_buffer() f = frame_factory.build_headers_frame( self.response_header_block + self.first_header_block, ) data = f.serialize() c.receive_data(data) # Build the attack payload. We need to shrink it by four bytes because # the promised_stream_id consumes four bytes of body. attack_frame = hyperframe.frame.PushPromiseFrame(stream_id=3) attack_frame.promised_stream_id = 2 attack_frame.data = self.second_header_block[:-4] attack_frame.flags.add("END_HEADERS") data = attack_frame.serialize() with pytest.raises(h2.exceptions.DenialOfServiceError): c.receive_data(data) expected_frame = frame_factory.build_goaway_frame( last_stream_id=0, error_code=h2.errors.ErrorCodes.ENHANCE_YOUR_CALM, ) assert c.data_to_send() == expected_frame.serialize() def test_reject_headers_when_list_size_shrunk(self, frame_factory) -> None: """ When we've shrunk the header list size, we reject new header blocks that violate the new size. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() # Receive the first request, which causes no problem. f = frame_factory.build_headers_frame( stream_id=1, headers=self.request_header_block, ) data = f.serialize() c.receive_data(data) # Now, send a settings change. It's un-ACKed at this time. A new # request arrives, also without incident. c.update_settings({h2.settings.SettingCodes.MAX_HEADER_LIST_SIZE: 50}) c.clear_outbound_data_buffer() f = frame_factory.build_headers_frame( stream_id=3, headers=self.request_header_block, ) data = f.serialize() c.receive_data(data) # We get a SETTINGS ACK. f = frame_factory.build_settings_frame({}, ack=True) data = f.serialize() c.receive_data(data) # Now a third request comes in. This explodes. f = frame_factory.build_headers_frame( stream_id=5, headers=self.request_header_block, ) data = f.serialize() with pytest.raises(h2.exceptions.DenialOfServiceError): c.receive_data(data) expected_frame = frame_factory.build_goaway_frame( last_stream_id=3, error_code=h2.errors.ErrorCodes.ENHANCE_YOUR_CALM, ) assert c.data_to_send() == expected_frame.serialize() def test_reject_headers_when_table_size_shrunk(self, frame_factory) -> None: """ When we've shrunk the header table size, we reject header blocks that do not respect the change. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() # Receive the first request, which causes no problem. f = frame_factory.build_headers_frame( stream_id=1, headers=self.request_header_block, ) data = f.serialize() c.receive_data(data) # Now, send a settings change. It's un-ACKed at this time. A new # request arrives, also without incident. c.update_settings({h2.settings.SettingCodes.HEADER_TABLE_SIZE: 128}) c.clear_outbound_data_buffer() f = frame_factory.build_headers_frame( stream_id=3, headers=self.request_header_block, ) data = f.serialize() c.receive_data(data) # We get a SETTINGS ACK. f = frame_factory.build_settings_frame({}, ack=True) data = f.serialize() c.receive_data(data) # Now a third request comes in. This explodes, as it does not contain # a dynamic table size update. f = frame_factory.build_headers_frame( stream_id=5, headers=self.request_header_block, ) data = f.serialize() with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(data) expected_frame = frame_factory.build_goaway_frame( last_stream_id=3, error_code=h2.errors.ErrorCodes.PROTOCOL_ERROR, ) assert c.data_to_send() == expected_frame.serialize() def test_reject_headers_exceeding_table_size(self, frame_factory) -> None: """ When the remote peer sends a dynamic table size update that exceeds our setting, we reject it. """ c = h2.connection.H2Connection(config=self.server_config) c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() # Receive the first request, which causes no problem. f = frame_factory.build_headers_frame( stream_id=1, headers=self.request_header_block, ) data = f.serialize() c.receive_data(data) # Now a second request comes in that sets the table size too high. # This explodes. frame_factory.change_table_size(c.local_settings.header_table_size + 1) f = frame_factory.build_headers_frame( stream_id=5, headers=self.request_header_block, ) data = f.serialize() with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(data) expected_frame = frame_factory.build_goaway_frame( last_stream_id=1, error_code=h2.errors.ErrorCodes.PROTOCOL_ERROR, ) assert c.data_to_send() == expected_frame.serialize() ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/test_priority.py0000644000076500000240000002775114744265074016054 0ustar00kriechistafffrom __future__ import annotations import pytest import h2.config import h2.connection import h2.errors import h2.events import h2.exceptions import h2.stream class TestPriority: """ Basic priority tests. """ example_request_headers = [ (":authority", "example.com"), (":path", "/"), (":scheme", "https"), (":method", "GET"), ] example_request_headers_bytes = [ (b":authority", b"example.com"), (b":path", b"/"), (b":scheme", b"https"), (b":method", b"GET"), ] example_response_headers = [ (":status", "200"), ("server", "pytest-h2"), ] server_config = h2.config.H2Configuration(client_side=False) def test_receiving_priority_emits_priority_update(self, frame_factory) -> None: """ Receiving a priority frame emits a PriorityUpdated event. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() f = frame_factory.build_priority_frame( stream_id=1, weight=255, ) events = c.receive_data(f.serialize()) assert len(events) == 1 assert not c.data_to_send() event = events[0] assert isinstance(event, h2.events.PriorityUpdated) assert event.stream_id == 1 assert event.depends_on == 0 assert event.weight == 256 assert event.exclusive is False @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_headers_with_priority_info(self, frame_factory, request_headers) -> None: """ Receiving a HEADERS frame with priority information on it emits a PriorityUpdated event. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() f = frame_factory.build_headers_frame( headers=request_headers, stream_id=3, flags=["PRIORITY"], stream_weight=15, depends_on=1, exclusive=True, ) events = c.receive_data(f.serialize()) assert len(events) == 2 assert not c.data_to_send() event = events[1] assert isinstance(event, h2.events.PriorityUpdated) assert event.stream_id == 3 assert event.depends_on == 1 assert event.weight == 16 assert event.exclusive is True @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_streams_may_not_depend_on_themselves(self, frame_factory, request_headers) -> None: """ A stream adjusted to depend on itself causes a Protocol Error. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() f = frame_factory.build_headers_frame( headers=request_headers, stream_id=3, flags=["PRIORITY"], stream_weight=15, depends_on=1, exclusive=True, ) c.receive_data(f.serialize()) c.clear_outbound_data_buffer() f = frame_factory.build_priority_frame( stream_id=3, depends_on=3, weight=15, ) with pytest.raises(h2.exceptions.ProtocolError): c.receive_data(f.serialize()) expected_frame = frame_factory.build_goaway_frame( last_stream_id=3, error_code=h2.errors.ErrorCodes.PROTOCOL_ERROR, ) assert c.data_to_send() == expected_frame.serialize() @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) @pytest.mark.parametrize( ("depends_on", "weight", "exclusive"), [ (0, 256, False), (3, 128, False), (3, 128, True), ], ) def test_can_prioritize_stream(self, depends_on, weight, exclusive, frame_factory, request_headers) -> None: """ hyper-h2 can emit priority frames. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(headers=request_headers, stream_id=1) c.send_headers(headers=request_headers, stream_id=3) c.clear_outbound_data_buffer() c.prioritize( stream_id=1, depends_on=depends_on, weight=weight, exclusive=exclusive, ) f = frame_factory.build_priority_frame( stream_id=1, weight=weight - 1, depends_on=depends_on, exclusive=exclusive, ) assert c.data_to_send() == f.serialize() @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) @pytest.mark.parametrize( ("depends_on", "weight", "exclusive"), [ (0, 256, False), (1, 128, False), (1, 128, True), ], ) def test_emit_headers_with_priority_info(self, depends_on, weight, exclusive, frame_factory, request_headers) -> None: """ It is possible to send a headers frame with priority information on it. """ c = h2.connection.H2Connection() c.initiate_connection() c.clear_outbound_data_buffer() c.send_headers( headers=request_headers, stream_id=3, priority_weight=weight, priority_depends_on=depends_on, priority_exclusive=exclusive, ) f = frame_factory.build_headers_frame( headers=request_headers, stream_id=3, flags=["PRIORITY"], stream_weight=weight - 1, depends_on=depends_on, exclusive=exclusive, ) assert c.data_to_send() == f.serialize() @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_may_not_prioritize_stream_to_depend_on_self(self, frame_factory, request_headers) -> None: """ A stream adjusted to depend on itself causes a Protocol Error. """ c = h2.connection.H2Connection() c.initiate_connection() c.receive_data(frame_factory.preamble()) c.send_headers( headers=request_headers, stream_id=3, priority_weight=255, priority_depends_on=0, priority_exclusive=False, ) c.clear_outbound_data_buffer() with pytest.raises(h2.exceptions.ProtocolError): c.prioritize( stream_id=3, depends_on=3, ) assert not c.data_to_send() @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_may_not_initially_set_stream_depend_on_self(self, frame_factory, request_headers) -> None: """ A stream that starts by depending on itself causes a Protocol Error. """ c = h2.connection.H2Connection() c.initiate_connection() c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() with pytest.raises(h2.exceptions.ProtocolError): c.send_headers( headers=request_headers, stream_id=3, priority_depends_on=3, ) assert not c.data_to_send() @pytest.mark.parametrize("weight", [0, -15, 257]) def test_prioritize_requires_valid_weight(self, weight) -> None: """ A call to prioritize with an invalid weight causes a ProtocolError. """ c = h2.connection.H2Connection() c.initiate_connection() c.clear_outbound_data_buffer() with pytest.raises(h2.exceptions.ProtocolError): c.prioritize(stream_id=1, weight=weight) assert not c.data_to_send() @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) @pytest.mark.parametrize("weight", [0, -15, 257]) def test_send_headers_requires_valid_weight(self, weight, request_headers) -> None: """ A call to send_headers with an invalid weight causes a ProtocolError. """ c = h2.connection.H2Connection() c.initiate_connection() c.clear_outbound_data_buffer() with pytest.raises(h2.exceptions.ProtocolError): c.send_headers( stream_id=1, headers=request_headers, priority_weight=weight, ) assert not c.data_to_send() def test_prioritize_defaults(self, frame_factory) -> None: """ When prioritize() is called with no explicit arguments, it emits a weight of 16, depending on stream zero non-exclusively. """ c = h2.connection.H2Connection() c.initiate_connection() c.clear_outbound_data_buffer() c.prioritize(stream_id=1) f = frame_factory.build_priority_frame( stream_id=1, weight=15, depends_on=0, exclusive=False, ) assert c.data_to_send() == f.serialize() @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) @pytest.mark.parametrize( "priority_kwargs", [ {"priority_weight": 16}, {"priority_depends_on": 0}, {"priority_exclusive": False}, ], ) def test_send_headers_defaults(self, priority_kwargs, frame_factory, request_headers) -> None: """ When send_headers() is called with only one explicit argument, it emits default values for everything else. """ c = h2.connection.H2Connection() c.initiate_connection() c.clear_outbound_data_buffer() c.send_headers( stream_id=1, headers=request_headers, **priority_kwargs, ) f = frame_factory.build_headers_frame( headers=request_headers, stream_id=1, flags=["PRIORITY"], stream_weight=15, depends_on=0, exclusive=False, ) assert c.data_to_send() == f.serialize() @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_servers_cannot_prioritize(self, frame_factory, request_headers) -> None: """ Server stacks are not allowed to call ``prioritize()``. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() f = frame_factory.build_headers_frame( stream_id=1, headers=request_headers, ) c.receive_data(f.serialize()) with pytest.raises(h2.exceptions.RFC1122Error): c.prioritize(stream_id=1) @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_servers_cannot_prioritize_with_headers(self, frame_factory, request_headers) -> None: """ Server stacks are not allowed to prioritize on headers either. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() f = frame_factory.build_headers_frame( stream_id=1, headers=request_headers, ) c.receive_data(f.serialize()) with pytest.raises(h2.exceptions.RFC1122Error): c.send_headers( stream_id=1, headers=self.example_response_headers, priority_weight=16, ) ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/test_related_events.py0000644000076500000240000003356414744265074017176 0ustar00kriechistaff""" Specific tests to validate the "related events" logic used by certain events inside hyper-h2. """ from __future__ import annotations import pytest import h2.config import h2.connection import h2.events class TestRelatedEvents: """ Related events correlate all those events that happen on a single frame. """ example_request_headers = [ (":authority", "example.com"), (":path", "/"), (":scheme", "https"), (":method", "GET"), ] example_request_headers_bytes = [ (b":authority", b"example.com"), (b":path", b"/"), (b":scheme", b"https"), (b":method", b"GET"), ] example_response_headers = [ (":status", "200"), ("server", "fake-serv/0.1.0"), ] informational_response_headers = [ (":status", "100"), ("server", "fake-serv/0.1.0"), ] example_trailers = [ ("another", "field"), ] server_config = h2.config.H2Configuration(client_side=False) @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_request_received_related_all(self, frame_factory, request_headers) -> None: """ RequestReceived has two possible related events: PriorityUpdated and StreamEnded, all fired when a single HEADERS frame is received. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) input_frame = frame_factory.build_headers_frame( headers=request_headers, flags=["END_STREAM", "PRIORITY"], stream_weight=15, depends_on=0, exclusive=False, ) events = c.receive_data(input_frame.serialize()) assert len(events) == 3 base_event = events[0] other_events = events[1:] assert base_event.stream_ended in other_events assert isinstance(base_event.stream_ended, h2.events.StreamEnded) assert base_event.priority_updated in other_events assert isinstance( base_event.priority_updated, h2.events.PriorityUpdated, ) @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_request_received_related_priority(self, frame_factory, request_headers) -> None: """ RequestReceived can be related to PriorityUpdated. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) input_frame = frame_factory.build_headers_frame( headers=request_headers, flags=["PRIORITY"], stream_weight=15, depends_on=0, exclusive=False, ) events = c.receive_data(input_frame.serialize()) assert len(events) == 2 base_event = events[0] priority_updated_event = events[1] assert base_event.priority_updated is priority_updated_event assert base_event.stream_ended is None assert isinstance( base_event.priority_updated, h2.events.PriorityUpdated, ) @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_request_received_related_stream_ended(self, frame_factory, request_headers) -> None: """ RequestReceived can be related to StreamEnded. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) input_frame = frame_factory.build_headers_frame( headers=request_headers, flags=["END_STREAM"], ) events = c.receive_data(input_frame.serialize()) assert len(events) == 2 base_event = events[0] stream_ended_event = events[1] assert base_event.stream_ended is stream_ended_event assert base_event.priority_updated is None assert isinstance(base_event.stream_ended, h2.events.StreamEnded) @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_response_received_related_nothing(self, frame_factory, request_headers) -> None: """ ResponseReceived is ordinarily related to no events. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=request_headers) input_frame = frame_factory.build_headers_frame( headers=self.example_response_headers, ) events = c.receive_data(input_frame.serialize()) assert len(events) == 1 base_event = events[0] assert base_event.stream_ended is None assert base_event.priority_updated is None @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_response_received_related_all(self, frame_factory, request_headers) -> None: """ ResponseReceived has two possible related events: PriorityUpdated and StreamEnded, all fired when a single HEADERS frame is received. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=request_headers) input_frame = frame_factory.build_headers_frame( headers=self.example_response_headers, flags=["END_STREAM", "PRIORITY"], stream_weight=15, depends_on=0, exclusive=False, ) events = c.receive_data(input_frame.serialize()) assert len(events) == 3 base_event = events[0] other_events = events[1:] assert base_event.stream_ended in other_events assert isinstance(base_event.stream_ended, h2.events.StreamEnded) assert base_event.priority_updated in other_events assert isinstance( base_event.priority_updated, h2.events.PriorityUpdated, ) @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_response_received_related_priority(self, frame_factory, request_headers) -> None: """ ResponseReceived can be related to PriorityUpdated. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=request_headers) input_frame = frame_factory.build_headers_frame( headers=self.example_response_headers, flags=["PRIORITY"], stream_weight=15, depends_on=0, exclusive=False, ) events = c.receive_data(input_frame.serialize()) assert len(events) == 2 base_event = events[0] priority_updated_event = events[1] assert base_event.priority_updated is priority_updated_event assert base_event.stream_ended is None assert isinstance( base_event.priority_updated, h2.events.PriorityUpdated, ) @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_response_received_related_stream_ended(self, frame_factory, request_headers) -> None: """ ResponseReceived can be related to StreamEnded. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=request_headers) input_frame = frame_factory.build_headers_frame( headers=self.example_response_headers, flags=["END_STREAM"], ) events = c.receive_data(input_frame.serialize()) assert len(events) == 2 base_event = events[0] stream_ended_event = events[1] assert base_event.stream_ended is stream_ended_event assert base_event.priority_updated is None assert isinstance(base_event.stream_ended, h2.events.StreamEnded) @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_trailers_received_related_all(self, frame_factory, request_headers) -> None: """ TrailersReceived has two possible related events: PriorityUpdated and StreamEnded, all fired when a single HEADERS frame is received. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=request_headers) f = frame_factory.build_headers_frame( headers=self.example_response_headers, ) c.receive_data(f.serialize()) input_frame = frame_factory.build_headers_frame( headers=self.example_trailers, flags=["END_STREAM", "PRIORITY"], stream_weight=15, depends_on=0, exclusive=False, ) events = c.receive_data(input_frame.serialize()) assert len(events) == 3 base_event = events[0] other_events = events[1:] assert base_event.stream_ended in other_events assert isinstance(base_event.stream_ended, h2.events.StreamEnded) assert base_event.priority_updated in other_events assert isinstance( base_event.priority_updated, h2.events.PriorityUpdated, ) @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_trailers_received_related_stream_ended(self, frame_factory, request_headers) -> None: """ TrailersReceived can be related to StreamEnded by itself. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=request_headers) f = frame_factory.build_headers_frame( headers=self.example_response_headers, ) c.receive_data(f.serialize()) input_frame = frame_factory.build_headers_frame( headers=self.example_trailers, flags=["END_STREAM"], ) events = c.receive_data(input_frame.serialize()) assert len(events) == 2 base_event = events[0] stream_ended_event = events[1] assert base_event.stream_ended is stream_ended_event assert base_event.priority_updated is None assert isinstance(base_event.stream_ended, h2.events.StreamEnded) @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_informational_response_related_nothing(self, frame_factory, request_headers) -> None: """ InformationalResponseReceived in the standard case is related to nothing. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=request_headers) input_frame = frame_factory.build_headers_frame( headers=self.informational_response_headers, ) events = c.receive_data(input_frame.serialize()) assert len(events) == 1 base_event = events[0] assert base_event.priority_updated is None @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_informational_response_received_related_all(self, frame_factory, request_headers) -> None: """ InformationalResponseReceived has one possible related event: PriorityUpdated, fired when a single HEADERS frame is received. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=request_headers) input_frame = frame_factory.build_headers_frame( headers=self.informational_response_headers, flags=["PRIORITY"], stream_weight=15, depends_on=0, exclusive=False, ) events = c.receive_data(input_frame.serialize()) assert len(events) == 2 base_event = events[0] priority_updated_event = events[1] assert base_event.priority_updated is priority_updated_event assert isinstance( base_event.priority_updated, h2.events.PriorityUpdated, ) @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_data_received_normally_relates_to_nothing(self, frame_factory, request_headers) -> None: """ A plain DATA frame leads to DataReceieved with no related events. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=request_headers) f = frame_factory.build_headers_frame( headers=self.example_response_headers, ) c.receive_data(f.serialize()) input_frame = frame_factory.build_data_frame( data=b"some data", ) events = c.receive_data(input_frame.serialize()) assert len(events) == 1 base_event = events[0] assert base_event.stream_ended is None @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_data_received_related_stream_ended(self, frame_factory, request_headers) -> None: """ DataReceived can be related to StreamEnded by itself. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=request_headers) f = frame_factory.build_headers_frame( headers=self.example_response_headers, ) c.receive_data(f.serialize()) input_frame = frame_factory.build_data_frame( data=b"some data", flags=["END_STREAM"], ) events = c.receive_data(input_frame.serialize()) assert len(events) == 2 base_event = events[0] stream_ended_event = events[1] assert base_event.stream_ended is stream_ended_event assert isinstance(base_event.stream_ended, h2.events.StreamEnded) ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/test_rfc7838.py0000644000076500000240000004061114744265074015265 0ustar00kriechistaff""" Test the RFC 7838 ALTSVC support. """ from __future__ import annotations import pytest import h2.config import h2.connection import h2.events import h2.exceptions class TestRFC7838Client: """ Tests that the client supports receiving the RFC 7838 AltSvc frame. """ example_request_headers = [ (":authority", "example.com"), (":path", "/"), (":scheme", "https"), (":method", "GET"), ] example_request_headers_bytes = [ (b":authority", b"example.com"), (b":path", b"/"), (b":scheme", b"https"), (b":method", b"GET"), ] example_response_headers = [ (":status", "200"), ("server", "fake-serv/0.1.0"), ] def test_receiving_altsvc_stream_zero(self, frame_factory) -> None: """ An ALTSVC frame received on stream zero correctly transposes all the fields from the frames. """ c = h2.connection.H2Connection() c.initiate_connection() c.clear_outbound_data_buffer() f = frame_factory.build_alt_svc_frame( stream_id=0, origin=b"example.com", field=b'h2=":8000"; ma=60', ) events = c.receive_data(f.serialize()) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.AlternativeServiceAvailable) assert event.origin == b"example.com" assert event.field_value == b'h2=":8000"; ma=60' # No data gets sent. assert not c.data_to_send() def test_receiving_altsvc_stream_zero_no_origin(self, frame_factory) -> None: """ An ALTSVC frame received on stream zero without an origin field is ignored. """ c = h2.connection.H2Connection() c.initiate_connection() c.clear_outbound_data_buffer() f = frame_factory.build_alt_svc_frame( stream_id=0, origin=b"", field=b'h2=":8000"; ma=60', ) events = c.receive_data(f.serialize()) assert not events assert not c.data_to_send() @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_receiving_altsvc_on_stream(self, frame_factory, request_headers) -> None: """ An ALTSVC frame received on a stream correctly transposes all the fields from the frame and attaches the expected origin. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=request_headers) c.clear_outbound_data_buffer() f = frame_factory.build_alt_svc_frame( stream_id=1, origin=b"", field=b'h2=":8000"; ma=60', ) events = c.receive_data(f.serialize()) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.AlternativeServiceAvailable) assert event.origin == b"example.com" assert event.field_value == b'h2=":8000"; ma=60' # No data gets sent. assert not c.data_to_send() @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_receiving_altsvc_on_stream_with_origin(self, frame_factory, request_headers) -> None: """ An ALTSVC frame received on a stream with an origin field present gets ignored. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=request_headers) c.clear_outbound_data_buffer() f = frame_factory.build_alt_svc_frame( stream_id=1, origin=b"example.com", field=b'h2=":8000"; ma=60', ) events = c.receive_data(f.serialize()) assert len(events) == 0 assert not c.data_to_send() def test_receiving_altsvc_on_stream_not_yet_opened(self, frame_factory) -> None: """ When an ALTSVC frame is received on a stream the client hasn't yet opened, the frame is ignored. """ c = h2.connection.H2Connection() c.initiate_connection() c.clear_outbound_data_buffer() # We'll test this twice, once on a client-initiated stream ID and once # on a server initiated one. f1 = frame_factory.build_alt_svc_frame( stream_id=1, origin=b"", field=b'h2=":8000"; ma=60', ) f2 = frame_factory.build_alt_svc_frame( stream_id=2, origin=b"", field=b'h2=":8000"; ma=60', ) events = c.receive_data(f1.serialize() + f2.serialize()) assert len(events) == 0 assert not c.data_to_send() def test_receiving_altsvc_before_sending_headers(self, frame_factory) -> None: """ When an ALTSVC frame is received but the client hasn't sent headers yet it gets ignored. """ c = h2.connection.H2Connection() c.initiate_connection() # We need to create the idle stream. We have to do it by calling # a private API. While this can't naturally happen in hyper-h2 (we # don't currently have a mechanism by which this could occur), it could # happen in the future and we defend against it. c._begin_new_stream( stream_id=1, allowed_ids=h2.connection.AllowedStreamIDs.ODD, ) c.clear_outbound_data_buffer() f = frame_factory.build_alt_svc_frame( stream_id=1, origin=b"", field=b'h2=":8000"; ma=60', ) events = c.receive_data(f.serialize()) assert len(events) == 0 assert not c.data_to_send() @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_receiving_altsvc_after_receiving_headers(self, frame_factory, request_headers) -> None: """ When an ALTSVC frame is received but the server has already sent headers it gets ignored. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=request_headers) f = frame_factory.build_headers_frame( headers=self.example_response_headers, ) c.receive_data(f.serialize()) c.clear_outbound_data_buffer() f = frame_factory.build_alt_svc_frame( stream_id=1, origin=b"", field=b'h2=":8000"; ma=60', ) events = c.receive_data(f.serialize()) assert len(events) == 0 assert not c.data_to_send() @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_receiving_altsvc_on_closed_stream(self, frame_factory, request_headers) -> None: """ When an ALTSVC frame is received on a closed stream, we ignore it. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers( stream_id=1, headers=request_headers, end_stream=True, ) f = frame_factory.build_headers_frame( headers=self.example_response_headers, flags=["END_STREAM"], ) c.receive_data(f.serialize()) c.clear_outbound_data_buffer() f = frame_factory.build_alt_svc_frame( stream_id=1, origin=b"", field=b'h2=":8000"; ma=60', ) events = c.receive_data(f.serialize()) assert len(events) == 0 assert not c.data_to_send() @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_receiving_altsvc_on_pushed_stream(self, frame_factory, request_headers) -> None: """ When an ALTSVC frame is received on a stream that the server pushed, the frame is accepted. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=request_headers) f = frame_factory.build_push_promise_frame( stream_id=1, promised_stream_id=2, headers=request_headers, ) c.receive_data(f.serialize()) c.clear_outbound_data_buffer() f = frame_factory.build_alt_svc_frame( stream_id=2, origin=b"", field=b'h2=":8000"; ma=60', ) events = c.receive_data(f.serialize()) assert len(events) == 1 event = events[0] assert isinstance(event, h2.events.AlternativeServiceAvailable) assert event.origin == b"example.com" assert event.field_value == b'h2=":8000"; ma=60' # No data gets sent. assert not c.data_to_send() @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_cannot_send_explicit_alternative_service(self, frame_factory, request_headers) -> None: """ A client cannot send an explicit alternative service. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=request_headers) c.clear_outbound_data_buffer() with pytest.raises(h2.exceptions.ProtocolError): c.advertise_alternative_service( field_value=b'h2=":8000"; ma=60', origin=b"example.com", ) @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_cannot_send_implicit_alternative_service(self, frame_factory, request_headers) -> None: """ A client cannot send an implicit alternative service. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=request_headers) c.clear_outbound_data_buffer() with pytest.raises(h2.exceptions.ProtocolError): c.advertise_alternative_service( field_value=b'h2=":8000"; ma=60', stream_id=1, ) class TestRFC7838Server: """ Tests that the server supports sending the RFC 7838 AltSvc frame. """ example_request_headers = [ (":authority", "example.com"), (":path", "/"), (":scheme", "https"), (":method", "GET"), ] example_request_headers_bytes = [ (b":authority", b"example.com"), (b":path", b"/"), (b":scheme", b"https"), (b":method", b"GET"), ] example_response_headers = [ (":status", "200"), ("server", "fake-serv/0.1.0"), ] server_config = h2.config.H2Configuration(client_side=False) def test_receiving_altsvc_as_server_stream_zero(self, frame_factory) -> None: """ When an ALTSVC frame is received on stream zero and we are a server, we ignore it. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() f = frame_factory.build_alt_svc_frame( stream_id=0, origin=b"example.com", field=b'h2=":8000"; ma=60', ) events = c.receive_data(f.serialize()) assert len(events) == 0 assert not c.data_to_send() @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_receiving_altsvc_as_server_on_stream(self, frame_factory, request_headers) -> None: """ When an ALTSVC frame is received on a stream and we are a server, we ignore it. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame( headers=request_headers, ) c.receive_data(f.serialize()) c.clear_outbound_data_buffer() f = frame_factory.build_alt_svc_frame( stream_id=1, origin=b"", field=b'h2=":8000"; ma=60', ) events = c.receive_data(f.serialize()) assert len(events) == 0 assert not c.data_to_send() def test_sending_explicit_alternative_service(self, frame_factory) -> None: """ A server can send an explicit alternative service. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() c.advertise_alternative_service( field_value=b'h2=":8000"; ma=60', origin=b"example.com", ) f = frame_factory.build_alt_svc_frame( stream_id=0, origin=b"example.com", field=b'h2=":8000"; ma=60', ) assert c.data_to_send() == f.serialize() @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_sending_implicit_alternative_service(self, frame_factory, request_headers) -> None: """ A server can send an implicit alternative service. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame( headers=request_headers, ) c.receive_data(f.serialize()) c.clear_outbound_data_buffer() c.advertise_alternative_service( field_value=b'h2=":8000"; ma=60', stream_id=1, ) f = frame_factory.build_alt_svc_frame( stream_id=1, origin=b"", field=b'h2=":8000"; ma=60', ) assert c.data_to_send() == f.serialize() def test_no_implicit_alternative_service_before_headers(self, frame_factory) -> None: """ If headers haven't been received yet, the server forbids sending an implicit alternative service. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) c.clear_outbound_data_buffer() with pytest.raises(h2.exceptions.ProtocolError): c.advertise_alternative_service( field_value=b'h2=":8000"; ma=60', stream_id=1, ) @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_no_implicit_alternative_service_after_response(self, frame_factory, request_headers) -> None: """ If the server has sent response headers, hyper-h2 forbids sending an implicit alternative service. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame( headers=request_headers, ) c.receive_data(f.serialize()) c.send_headers(stream_id=1, headers=self.example_response_headers) c.clear_outbound_data_buffer() with pytest.raises(h2.exceptions.ProtocolError): c.advertise_alternative_service( field_value=b'h2=":8000"; ma=60', stream_id=1, ) @pytest.mark.parametrize("request_headers", [example_request_headers, example_request_headers_bytes]) def test_cannot_provide_origin_and_stream_id(self, frame_factory, request_headers) -> None: """ The user cannot provide both the origin and stream_id arguments when advertising alternative services. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame( headers=request_headers, ) c.receive_data(f.serialize()) with pytest.raises(ValueError): c.advertise_alternative_service( field_value=b'h2=":8000"; ma=60', origin=b"example.com", stream_id=1, ) def test_cannot_provide_unicode_altsvc_field(self, frame_factory) -> None: """ The user cannot provide the field value for alternative services as a unicode string. """ c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) with pytest.raises(ValueError): c.advertise_alternative_service( field_value='h2=":8000"; ma=60', origin=b"example.com", ) ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/test_rfc8441.py0000644000076500000240000000267414744265074015263 0ustar00kriechistaff""" Test the RFC 8441 extended connect request support. """ from __future__ import annotations import pytest import h2.config import h2.connection import h2.events from h2.utilities import utf8_encode_headers class TestRFC8441: """ Tests that the client supports sending an extended connect request and the server supports receiving it. """ headers = [ (":authority", "example.com"), (":path", "/"), (":scheme", "https"), (":method", "CONNECT"), (":protocol", "websocket"), ("user-agent", "someua/0.0.1"), ] headers_bytes = [ (b":authority", b"example.com"), (b":path", b"/"), (b":scheme", b"https"), (b":method", b"CONNECT"), (b":protocol", b"websocket"), (b"user-agent", b"someua/0.0.1"), ] @pytest.mark.parametrize("headers", [headers, headers_bytes]) def test_can_send_headers(self, frame_factory, headers) -> None: client = h2.connection.H2Connection() client.initiate_connection() client.send_headers(stream_id=1, headers=headers) server = h2.connection.H2Connection( config=h2.config.H2Configuration(client_side=False), ) events = server.receive_data(client.data_to_send()) event = events[1] assert isinstance(event, h2.events.RequestReceived) assert event.stream_id == 1 assert event.headers == utf8_encode_headers(headers) ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/test_settings.py0000644000076500000240000004064714744265074016032 0ustar00kriechistaff""" Test the Settings object. """ from __future__ import annotations import pytest from hypothesis import assume, given from hypothesis.strategies import booleans, builds, fixed_dictionaries, integers import h2.errors import h2.exceptions import h2.settings class TestSettings: """ Test the Settings object behaves as expected. """ def test_settings_defaults_client(self) -> None: """ The Settings object begins with the appropriate defaults for clients. """ s = h2.settings.Settings(client=True) assert s[h2.settings.SettingCodes.HEADER_TABLE_SIZE] == 4096 assert s[h2.settings.SettingCodes.ENABLE_PUSH] == 1 assert s[h2.settings.SettingCodes.INITIAL_WINDOW_SIZE] == 65535 assert s[h2.settings.SettingCodes.MAX_FRAME_SIZE] == 16384 assert s[h2.settings.SettingCodes.ENABLE_CONNECT_PROTOCOL] == 0 def test_settings_defaults_server(self) -> None: """ The Settings object begins with the appropriate defaults for servers. """ s = h2.settings.Settings(client=False) assert s[h2.settings.SettingCodes.HEADER_TABLE_SIZE] == 4096 assert s[h2.settings.SettingCodes.ENABLE_PUSH] == 0 assert s[h2.settings.SettingCodes.INITIAL_WINDOW_SIZE] == 65535 assert s[h2.settings.SettingCodes.MAX_FRAME_SIZE] == 16384 assert s[h2.settings.SettingCodes.ENABLE_CONNECT_PROTOCOL] == 0 @pytest.mark.parametrize("client", [True, False]) def test_can_set_initial_values(self, client) -> None: """ The Settings object can be provided initial values that override the defaults. """ overrides = { h2.settings.SettingCodes.HEADER_TABLE_SIZE: 8080, h2.settings.SettingCodes.MAX_FRAME_SIZE: 16388, h2.settings.SettingCodes.MAX_CONCURRENT_STREAMS: 100, h2.settings.SettingCodes.MAX_HEADER_LIST_SIZE: 2**16, h2.settings.SettingCodes.ENABLE_CONNECT_PROTOCOL: 1, } s = h2.settings.Settings(client=client, initial_values=overrides) assert s[h2.settings.SettingCodes.HEADER_TABLE_SIZE] == 8080 assert s[h2.settings.SettingCodes.ENABLE_PUSH] == bool(client) assert s[h2.settings.SettingCodes.INITIAL_WINDOW_SIZE] == 65535 assert s[h2.settings.SettingCodes.MAX_FRAME_SIZE] == 16388 assert s[h2.settings.SettingCodes.MAX_CONCURRENT_STREAMS] == 100 assert s[h2.settings.SettingCodes.MAX_HEADER_LIST_SIZE] == 2**16 assert s[h2.settings.SettingCodes.ENABLE_CONNECT_PROTOCOL] == 1 @pytest.mark.parametrize( ("setting", "value"), [ (h2.settings.SettingCodes.ENABLE_PUSH, 2), (h2.settings.SettingCodes.ENABLE_PUSH, -1), (h2.settings.SettingCodes.INITIAL_WINDOW_SIZE, -1), (h2.settings.SettingCodes.INITIAL_WINDOW_SIZE, 2**34), (h2.settings.SettingCodes.MAX_FRAME_SIZE, 1), (h2.settings.SettingCodes.MAX_FRAME_SIZE, 2**30), (h2.settings.SettingCodes.MAX_HEADER_LIST_SIZE, -1), (h2.settings.SettingCodes.ENABLE_CONNECT_PROTOCOL, -1), ], ) def test_cannot_set_invalid_initial_values(self, setting, value) -> None: """ The Settings object can be provided initial values that override the defaults. """ overrides = {setting: value} with pytest.raises(h2.exceptions.InvalidSettingsValueError): h2.settings.Settings(initial_values=overrides) def test_applying_value_doesnt_take_effect_immediately(self) -> None: """ When a value is applied to the settings object, it doesn't immediately take effect. """ s = h2.settings.Settings(client=True) s[h2.settings.SettingCodes.HEADER_TABLE_SIZE] == 8000 assert s[h2.settings.SettingCodes.HEADER_TABLE_SIZE] == 4096 def test_acknowledging_values(self) -> None: """ When we acknowledge settings, the values change. """ s = h2.settings.Settings(client=True) old_settings = dict(s) new_settings = { h2.settings.SettingCodes.HEADER_TABLE_SIZE: 4000, h2.settings.SettingCodes.ENABLE_PUSH: 0, h2.settings.SettingCodes.INITIAL_WINDOW_SIZE: 60, h2.settings.SettingCodes.MAX_FRAME_SIZE: 16385, h2.settings.SettingCodes.ENABLE_CONNECT_PROTOCOL: 1, } s.update(new_settings) assert dict(s) == old_settings s.acknowledge() assert dict(s) == new_settings def test_acknowledging_returns_the_changed_settings(self) -> None: """ Acknowledging settings returns the changes. """ s = h2.settings.Settings(client=True) s[h2.settings.SettingCodes.HEADER_TABLE_SIZE] = 8000 s[h2.settings.SettingCodes.ENABLE_PUSH] = 0 changes = s.acknowledge() assert len(changes) == 2 table_size_change = ( changes[h2.settings.SettingCodes.HEADER_TABLE_SIZE] ) push_change = changes[h2.settings.SettingCodes.ENABLE_PUSH] assert table_size_change.setting == ( h2.settings.SettingCodes.HEADER_TABLE_SIZE ) assert table_size_change.original_value == 4096 assert table_size_change.new_value == 8000 assert push_change.setting == h2.settings.SettingCodes.ENABLE_PUSH assert push_change.original_value == 1 assert push_change.new_value == 0 def test_acknowledging_only_returns_changed_settings(self) -> None: """ Acknowledging settings does not return unchanged settings. """ s = h2.settings.Settings(client=True) s[h2.settings.SettingCodes.INITIAL_WINDOW_SIZE] = 70 changes = s.acknowledge() assert len(changes) == 1 assert list(changes.keys()) == [ h2.settings.SettingCodes.INITIAL_WINDOW_SIZE, ] def test_deleting_values_deletes_all_of_them(self) -> None: """ When we delete a key we lose all state about it. """ s = h2.settings.Settings(client=True) s[h2.settings.SettingCodes.HEADER_TABLE_SIZE] == 8000 del s[h2.settings.SettingCodes.HEADER_TABLE_SIZE] with pytest.raises(KeyError): s[h2.settings.SettingCodes.HEADER_TABLE_SIZE] def test_length_correctly_reported(self) -> None: """ Length is related only to the number of keys. """ s = h2.settings.Settings(client=True) assert len(s) == 5 s[h2.settings.SettingCodes.HEADER_TABLE_SIZE] == 8000 assert len(s) == 5 s.acknowledge() assert len(s) == 5 del s[h2.settings.SettingCodes.HEADER_TABLE_SIZE] assert len(s) == 4 def test_new_values_work(self) -> None: """ New values initially don't appear """ s = h2.settings.Settings(client=True) s[80] = 81 with pytest.raises(KeyError): s[80] def test_new_values_follow_basic_acknowledgement_rules(self) -> None: """ A new value properly appears when acknowledged. """ s = h2.settings.Settings(client=True) s[80] = 81 changed_settings = s.acknowledge() assert s[80] == 81 assert len(changed_settings) == 1 changed = changed_settings[80] assert changed.setting == 80 assert changed.original_value is None assert changed.new_value == 81 def test_single_values_arent_affected_by_acknowledgement(self) -> None: """ When acknowledged, unchanged settings remain unchanged. """ s = h2.settings.Settings(client=True) assert s[h2.settings.SettingCodes.HEADER_TABLE_SIZE] == 4096 s.acknowledge() assert s[h2.settings.SettingCodes.HEADER_TABLE_SIZE] == 4096 def test_settings_getters(self) -> None: """ Getters exist for well-known settings. """ s = h2.settings.Settings(client=True) assert s.header_table_size == ( s[h2.settings.SettingCodes.HEADER_TABLE_SIZE] ) assert s.enable_push == s[h2.settings.SettingCodes.ENABLE_PUSH] assert s.initial_window_size == ( s[h2.settings.SettingCodes.INITIAL_WINDOW_SIZE] ) assert s.max_frame_size == s[h2.settings.SettingCodes.MAX_FRAME_SIZE] assert s.max_concurrent_streams == 2**32 + 1 # A sensible default. assert s.max_header_list_size is None assert s.enable_connect_protocol == s[ h2.settings.SettingCodes.ENABLE_CONNECT_PROTOCOL ] def test_settings_setters(self) -> None: """ Setters exist for well-known settings. """ s = h2.settings.Settings(client=True) s.header_table_size = 0 s.enable_push = 1 s.initial_window_size = 2 s.max_frame_size = 16385 s.max_concurrent_streams = 4 s.max_header_list_size = 2**16 s.enable_connect_protocol = 1 s.acknowledge() assert s[h2.settings.SettingCodes.HEADER_TABLE_SIZE] == 0 assert s[h2.settings.SettingCodes.ENABLE_PUSH] == 1 assert s[h2.settings.SettingCodes.INITIAL_WINDOW_SIZE] == 2 assert s[h2.settings.SettingCodes.MAX_FRAME_SIZE] == 16385 assert s[h2.settings.SettingCodes.MAX_CONCURRENT_STREAMS] == 4 assert s[h2.settings.SettingCodes.MAX_HEADER_LIST_SIZE] == 2**16 assert s[h2.settings.SettingCodes.ENABLE_CONNECT_PROTOCOL] == 1 @given(integers()) def test_cannot_set_invalid_values_for_enable_push(self, val) -> None: """ SETTINGS_ENABLE_PUSH only allows two values: 0, 1. """ assume(val not in (0, 1)) s = h2.settings.Settings() with pytest.raises(h2.exceptions.InvalidSettingsValueError) as e: s.enable_push = val s.acknowledge() assert e.value.error_code == h2.errors.ErrorCodes.PROTOCOL_ERROR assert s.enable_push == 1 with pytest.raises(h2.exceptions.InvalidSettingsValueError) as e: s[h2.settings.SettingCodes.ENABLE_PUSH] = val s.acknowledge() assert e.value.error_code == h2.errors.ErrorCodes.PROTOCOL_ERROR assert s[h2.settings.SettingCodes.ENABLE_PUSH] == 1 @given(integers()) def test_cannot_set_invalid_vals_for_initial_window_size(self, val) -> None: """ SETTINGS_INITIAL_WINDOW_SIZE only allows values between 0 and 2**32 - 1 inclusive. """ s = h2.settings.Settings() if 0 <= val <= 2**31 - 1: s.initial_window_size = val s.acknowledge() assert s.initial_window_size == val else: with pytest.raises(h2.exceptions.InvalidSettingsValueError) as e: s.initial_window_size = val s.acknowledge() assert ( e.value.error_code == h2.errors.ErrorCodes.FLOW_CONTROL_ERROR ) assert s.initial_window_size == 65535 with pytest.raises(h2.exceptions.InvalidSettingsValueError) as e: s[h2.settings.SettingCodes.INITIAL_WINDOW_SIZE] = val s.acknowledge() assert ( e.value.error_code == h2.errors.ErrorCodes.FLOW_CONTROL_ERROR ) assert s[h2.settings.SettingCodes.INITIAL_WINDOW_SIZE] == 65535 @given(integers()) def test_cannot_set_invalid_values_for_max_frame_size(self, val) -> None: """ SETTINGS_MAX_FRAME_SIZE only allows values between 2**14 and 2**24 - 1. """ s = h2.settings.Settings() if 2**14 <= val <= 2**24 - 1: s.max_frame_size = val s.acknowledge() assert s.max_frame_size == val else: with pytest.raises(h2.exceptions.InvalidSettingsValueError) as e: s.max_frame_size = val s.acknowledge() assert e.value.error_code == h2.errors.ErrorCodes.PROTOCOL_ERROR assert s.max_frame_size == 16384 with pytest.raises(h2.exceptions.InvalidSettingsValueError) as e: s[h2.settings.SettingCodes.MAX_FRAME_SIZE] = val s.acknowledge() assert e.value.error_code == h2.errors.ErrorCodes.PROTOCOL_ERROR assert s[h2.settings.SettingCodes.MAX_FRAME_SIZE] == 16384 @given(integers()) def test_cannot_set_invalid_values_for_max_header_list_size(self, val) -> None: """ SETTINGS_MAX_HEADER_LIST_SIZE only allows non-negative values. """ s = h2.settings.Settings() if val >= 0: s.max_header_list_size = val s.acknowledge() assert s.max_header_list_size == val else: with pytest.raises(h2.exceptions.InvalidSettingsValueError) as e: s.max_header_list_size = val s.acknowledge() assert e.value.error_code == h2.errors.ErrorCodes.PROTOCOL_ERROR assert s.max_header_list_size is None with pytest.raises(h2.exceptions.InvalidSettingsValueError) as e: s[h2.settings.SettingCodes.MAX_HEADER_LIST_SIZE] = val s.acknowledge() assert e.value.error_code == h2.errors.ErrorCodes.PROTOCOL_ERROR with pytest.raises(KeyError): s[h2.settings.SettingCodes.MAX_HEADER_LIST_SIZE] @given(integers()) def test_cannot_set_invalid_values_for_enable_connect_protocol(self, val) -> None: """ SETTINGS_ENABLE_CONNECT_PROTOCOL only allows two values: 0, 1. """ assume(val not in (0, 1)) s = h2.settings.Settings() with pytest.raises(h2.exceptions.InvalidSettingsValueError) as e: s.enable_connect_protocol = val s.acknowledge() assert e.value.error_code == h2.errors.ErrorCodes.PROTOCOL_ERROR assert s.enable_connect_protocol == 0 with pytest.raises(h2.exceptions.InvalidSettingsValueError) as e: s[h2.settings.SettingCodes.ENABLE_CONNECT_PROTOCOL] = val s.acknowledge() assert e.value.error_code == h2.errors.ErrorCodes.PROTOCOL_ERROR assert s[h2.settings.SettingCodes.ENABLE_CONNECT_PROTOCOL] == 0 class TestSettingsEquality: """ A class defining tests for the standard implementation of == and != . """ SettingsStrategy = builds( h2.settings.Settings, client=booleans(), initial_values=fixed_dictionaries({ h2.settings.SettingCodes.HEADER_TABLE_SIZE: integers(0, 2**32 - 1), h2.settings.SettingCodes.ENABLE_PUSH: integers(0, 1), h2.settings.SettingCodes.INITIAL_WINDOW_SIZE: integers(0, 2**31 - 1), h2.settings.SettingCodes.MAX_FRAME_SIZE: integers(2**14, 2**24 - 1), h2.settings.SettingCodes.MAX_CONCURRENT_STREAMS: integers(0, 2**32 - 1), h2.settings.SettingCodes.MAX_HEADER_LIST_SIZE: integers(0, 2**32 - 1), }), ) @given(settings=SettingsStrategy) def test_equality_reflexive(self, settings) -> None: """ An object compares equal to itself using the == operator and the != operator. """ assert (settings == settings) assert settings == settings @given(settings=SettingsStrategy, o_settings=SettingsStrategy) def test_equality_multiple(self, settings, o_settings) -> None: """ Two objects compare themselves using the == operator and the != operator. """ if settings == o_settings: assert settings == o_settings assert settings == o_settings else: assert settings != o_settings assert settings != o_settings @given(settings=SettingsStrategy) def test_another_type_equality(self, settings) -> None: """ The object does not compare equal to an object of an unrelated type (which does not implement the comparison) using the == operator. """ obj = object() assert (settings != obj) assert settings != obj @given(settings=SettingsStrategy) def test_delegated_eq(self, settings) -> None: """ The result of comparison is delegated to the right-hand operand if it is of an unrelated type. """ class Delegate: def __eq__(self, other): return [self] def __ne__(self, other): return [self] delg = Delegate() assert (settings == delg) == [delg] assert (settings != delg) == [delg] ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/test_state_machines.py0000644000076500000240000001312514744265074017150 0ustar00kriechistaff""" These tests validate the state machines directly. Writing meaningful tests for this case can be tricky, so the majority of these tests use Hypothesis to try to talk about general behaviours rather than specific cases. """ from __future__ import annotations import pytest from hypothesis import given from hypothesis.strategies import sampled_from import h2.connection import h2.exceptions import h2.stream class TestConnectionStateMachine: """ Tests of the connection state machine. """ @given(state=sampled_from(h2.connection.ConnectionState), input_=sampled_from(h2.connection.ConnectionInputs)) def test_state_transitions(self, state, input_) -> None: c = h2.connection.H2ConnectionStateMachine() c.state = state try: c.process_input(input_) except h2.exceptions.ProtocolError: assert c.state == h2.connection.ConnectionState.CLOSED else: assert c.state in h2.connection.ConnectionState def test_state_machine_only_allows_connection_states(self) -> None: """ The Connection state machine only allows ConnectionState inputs. """ c = h2.connection.H2ConnectionStateMachine() with pytest.raises(ValueError): c.process_input(1) @pytest.mark.parametrize( "state", ( s for s in h2.connection.ConnectionState if s != h2.connection.ConnectionState.CLOSED ), ) @pytest.mark.parametrize( "input_", [ h2.connection.ConnectionInputs.RECV_PRIORITY, h2.connection.ConnectionInputs.SEND_PRIORITY, ], ) def test_priority_frames_allowed_in_all_states(self, state, input_) -> None: """ Priority frames can be sent/received in all connection states except closed. """ c = h2.connection.H2ConnectionStateMachine() c.state = state c.process_input(input_) class TestStreamStateMachine: """ Tests of the stream state machine. """ @given(state=sampled_from(h2.stream.StreamState), input_=sampled_from(h2.stream.StreamInputs)) def test_state_transitions(self, state, input_) -> None: s = h2.stream.H2StreamStateMachine(stream_id=1) s.state = state try: s.process_input(input_) except h2.exceptions.StreamClosedError: # This can only happen for streams that started in the closed # state OR where the input was RECV_DATA and the state was not # OPEN or HALF_CLOSED_LOCAL OR where the state was # HALF_CLOSED_REMOTE and a frame was received. if state == h2.stream.StreamState.CLOSED: assert s.state == h2.stream.StreamState.CLOSED elif input_ == h2.stream.StreamInputs.RECV_DATA: assert s.state == h2.stream.StreamState.CLOSED assert state not in ( h2.stream.StreamState.OPEN, h2.stream.StreamState.HALF_CLOSED_LOCAL, ) elif state == h2.stream.StreamState.HALF_CLOSED_REMOTE: assert input_ in ( h2.stream.StreamInputs.RECV_HEADERS, h2.stream.StreamInputs.RECV_PUSH_PROMISE, h2.stream.StreamInputs.RECV_DATA, h2.stream.StreamInputs.RECV_CONTINUATION, ) except h2.exceptions.ProtocolError: assert s.state == h2.stream.StreamState.CLOSED else: assert s.state in h2.stream.StreamState def test_state_machine_only_allows_stream_states(self) -> None: """ The Stream state machine only allows StreamState inputs. """ s = h2.stream.H2StreamStateMachine(stream_id=1) with pytest.raises(ValueError): s.process_input(1) def test_stream_state_machine_forbids_pushes_on_server_streams(self) -> None: """ Streams where this peer is a server do not allow receiving pushed frames. """ s = h2.stream.H2StreamStateMachine(stream_id=1) s.process_input(h2.stream.StreamInputs.RECV_HEADERS) with pytest.raises(h2.exceptions.ProtocolError): s.process_input(h2.stream.StreamInputs.RECV_PUSH_PROMISE) def test_stream_state_machine_forbids_sending_pushes_from_clients(self) -> None: """ Streams where this peer is a client do not allow sending pushed frames. """ s = h2.stream.H2StreamStateMachine(stream_id=1) s.process_input(h2.stream.StreamInputs.SEND_HEADERS) with pytest.raises(h2.exceptions.ProtocolError): s.process_input(h2.stream.StreamInputs.SEND_PUSH_PROMISE) @pytest.mark.parametrize( "input_", [ h2.stream.StreamInputs.SEND_HEADERS, h2.stream.StreamInputs.SEND_PUSH_PROMISE, h2.stream.StreamInputs.SEND_RST_STREAM, h2.stream.StreamInputs.SEND_DATA, h2.stream.StreamInputs.SEND_WINDOW_UPDATE, h2.stream.StreamInputs.SEND_END_STREAM, ], ) def test_cannot_send_on_closed_streams(self, input_) -> None: """ Sending anything but a PRIORITY frame is forbidden on closed streams. """ c = h2.stream.H2StreamStateMachine(stream_id=1) c.state = h2.stream.StreamState.CLOSED expected_error = ( h2.exceptions.ProtocolError if input_ == h2.stream.StreamInputs.SEND_PUSH_PROMISE else h2.exceptions.StreamClosedError ) with pytest.raises(expected_error): c.process_input(input_) ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/test_stream_reset.py0000644000076500000240000001145314744265074016660 0ustar00kriechistaff""" More complex tests that exercise stream resetting functionality to validate that connection state is appropriately maintained. Specifically, these tests validate that streams that have been reset accurately keep track of connection-level state. """ from __future__ import annotations import pytest import h2.connection import h2.errors import h2.events class TestStreamReset: """ Tests for resetting streams. """ example_request_headers = [ (b":authority", b"example.com"), (b":path", b"/"), (b":scheme", b"https"), (b":method", b"GET"), ] example_response_headers = [ (b":status", b"200"), (b"server", b"fake-serv/0.1.0"), (b"content-length", b"0"), ] def test_reset_stream_keeps_header_state_correct(self, frame_factory) -> None: """ A stream that has been reset still affects the header decoder. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=self.example_request_headers) c.reset_stream(stream_id=1) c.send_headers(stream_id=3, headers=self.example_request_headers) c.clear_outbound_data_buffer() f = frame_factory.build_headers_frame( headers=self.example_response_headers, stream_id=1, ) rst_frame = frame_factory.build_rst_stream_frame( 1, h2.errors.ErrorCodes.STREAM_CLOSED, ) events = c.receive_data(f.serialize()) assert not events assert c.data_to_send() == rst_frame.serialize() # This works because the header state should be intact from the headers # frame that was send on stream 1, so they should decode cleanly. f = frame_factory.build_headers_frame( headers=self.example_response_headers, stream_id=3, ) event = c.receive_data(f.serialize())[0] assert isinstance(event, h2.events.ResponseReceived) assert event.stream_id == 3 assert event.headers == self.example_response_headers @pytest.mark.parametrize(("close_id", "other_id"), [(1, 3), (3, 1)]) def test_reset_stream_keeps_flow_control_correct(self, close_id, other_id, frame_factory) -> None: """ A stream that has been reset does not affect the connection flow control window. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=self.example_request_headers) c.send_headers(stream_id=3, headers=self.example_request_headers) # Record the initial window size. initial_window = c.remote_flow_control_window(stream_id=other_id) f = frame_factory.build_headers_frame( headers=self.example_response_headers, stream_id=close_id, ) c.receive_data(f.serialize()) c.reset_stream(stream_id=close_id) c.clear_outbound_data_buffer() f = frame_factory.build_data_frame( data=b"some data", stream_id=close_id, ) c.receive_data(f.serialize()) expected = frame_factory.build_rst_stream_frame( stream_id=close_id, error_code=h2.errors.ErrorCodes.STREAM_CLOSED, ).serialize() assert c.data_to_send() == expected new_window = c.remote_flow_control_window(stream_id=other_id) assert initial_window - len(b"some data") == new_window @pytest.mark.parametrize("clear_streams", [True, False]) def test_reset_stream_automatically_resets_pushed_streams(self, frame_factory, clear_streams) -> None: """ Resetting a stream causes RST_STREAM frames to be automatically emitted to close any streams pushed after the reset. """ c = h2.connection.H2Connection() c.initiate_connection() c.send_headers(stream_id=1, headers=self.example_request_headers) c.reset_stream(stream_id=1) c.clear_outbound_data_buffer() if clear_streams: # Call open_outbound_streams to force the connection to clean # closed streams. c.open_outbound_streams f = frame_factory.build_push_promise_frame( stream_id=1, promised_stream_id=2, headers=self.example_request_headers, ) events = c.receive_data(f.serialize()) assert not events f = frame_factory.build_rst_stream_frame( stream_id=2, error_code=h2.errors.ErrorCodes.REFUSED_STREAM, ) assert c.data_to_send() == f.serialize() ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1737583164.0 h2-4.2.0/tests/test_utility_functions.py0000644000076500000240000001442514744265074017760 0ustar00kriechistaff""" Tests for the various utility functions provided by hyper-h2. """ from __future__ import annotations import pytest import h2.config import h2.connection import h2.errors import h2.events import h2.exceptions from h2.utilities import SizeLimitDict, extract_method_header class TestGetNextAvailableStreamID: """ Tests for the ``H2Connection.get_next_available_stream_id`` method. """ example_request_headers = [ (":authority", "example.com"), (":path", "/"), (":scheme", "https"), (":method", "GET"), ] example_response_headers = [ (":status", "200"), ("server", "fake-serv/0.1.0"), ] server_config = h2.config.H2Configuration(client_side=False) def test_returns_correct_sequence_for_clients(self, frame_factory) -> None: """ For a client connection, the correct sequence of stream IDs is returned. """ # Running the exhaustive version of this test (all 1 billion available # stream IDs) is too painful. For that reason, we validate that the # original sequence is right for the first few thousand, and then just # check that it terminates properly. # # Make sure that the streams get cleaned up: 8k streams floating # around would make this test memory-hard, and it's not supposed to be # a test of how much RAM your machine has. c = h2.connection.H2Connection() c.initiate_connection() initial_sequence = range(1, 2**13, 2) for expected_stream_id in initial_sequence: stream_id = c.get_next_available_stream_id() assert stream_id == expected_stream_id c.send_headers( stream_id=stream_id, headers=self.example_request_headers, end_stream=True, ) f = frame_factory.build_headers_frame( headers=self.example_response_headers, stream_id=stream_id, flags=["END_STREAM"], ) c.receive_data(f.serialize()) c.clear_outbound_data_buffer() # Jump up to the last available stream ID. Don't clean up the stream # here because who cares about one stream. last_client_id = 2**31 - 1 c.send_headers( stream_id=last_client_id, headers=self.example_request_headers, end_stream=True, ) with pytest.raises(h2.exceptions.NoAvailableStreamIDError): c.get_next_available_stream_id() def test_returns_correct_sequence_for_servers(self, frame_factory) -> None: """ For a server connection, the correct sequence of stream IDs is returned. """ # Running the exhaustive version of this test (all 1 billion available # stream IDs) is too painful. For that reason, we validate that the # original sequence is right for the first few thousand, and then just # check that it terminates properly. # # Make sure that the streams get cleaned up: 8k streams floating # around would make this test memory-hard, and it's not supposed to be # a test of how much RAM your machine has. c = h2.connection.H2Connection(config=self.server_config) c.initiate_connection() c.receive_data(frame_factory.preamble()) f = frame_factory.build_headers_frame( headers=self.example_request_headers, ) c.receive_data(f.serialize()) initial_sequence = range(2, 2**13, 2) for expected_stream_id in initial_sequence: stream_id = c.get_next_available_stream_id() assert stream_id == expected_stream_id c.push_stream( stream_id=1, promised_stream_id=stream_id, request_headers=self.example_request_headers, ) c.send_headers( stream_id=stream_id, headers=self.example_response_headers, end_stream=True, ) c.clear_outbound_data_buffer() # Jump up to the last available stream ID. Don't clean up the stream # here because who cares about one stream. last_server_id = 2**31 - 2 c.push_stream( stream_id=1, promised_stream_id=last_server_id, request_headers=self.example_request_headers, ) with pytest.raises(h2.exceptions.NoAvailableStreamIDError): c.get_next_available_stream_id() def test_does_not_increment_without_stream_send(self) -> None: """ If a new stream isn't actually created, the next stream ID doesn't change. """ c = h2.connection.H2Connection() c.initiate_connection() first_stream_id = c.get_next_available_stream_id() second_stream_id = c.get_next_available_stream_id() assert first_stream_id == second_stream_id c.send_headers( stream_id=first_stream_id, headers=self.example_request_headers, ) third_stream_id = c.get_next_available_stream_id() assert third_stream_id == (first_stream_id + 2) class TestExtractHeader: example_headers_with_bytes = [ (b":authority", b"example.com"), (b":path", b"/"), (b":scheme", b"https"), (b":method", b"GET"), ] def test_extract_header_method(self) -> None: assert extract_method_header( self.example_headers_with_bytes, ) == b"GET" def test_size_limit_dict_limit() -> None: dct = SizeLimitDict(size_limit=2) dct[1] = 1 dct[2] = 2 assert len(dct) == 2 assert dct[1] == 1 assert dct[2] == 2 dct[3] = 3 assert len(dct) == 2 assert dct[2] == 2 assert dct[3] == 3 assert 1 not in dct def test_size_limit_dict_limit_init() -> None: initial_dct = { 1: 1, 2: 2, 3: 3, } dct = SizeLimitDict(initial_dct, size_limit=2) assert len(dct) == 2 def test_size_limit_dict_no_limit() -> None: dct = SizeLimitDict(size_limit=None) dct[1] = 1 dct[2] = 2 assert len(dct) == 2 assert dct[1] == 1 assert dct[2] == 2 dct[3] = 3 assert len(dct) == 3 assert dct[1] == 1 assert dct[2] == 2 assert dct[3] == 3 ././@PaxHeader0000000000000000000000000000003400000000000010212 xustar0028 mtime=1738482098.7741978 h2-4.2.0/visualizer/0000755000076500000240000000000014747620663013603 5ustar00kriechistaff././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1501439525.0 h2-4.2.0/visualizer/NOTICES.visualizer0000644000076500000240000000223113137423045017007 0ustar00kriechistaffThis module contains code inspired by and borrowed from Automat. That code was made available under the following license: Copyright (c) 2014 Rackspace Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. ././@PaxHeader0000000000000000000000000000002600000000000010213 xustar0022 mtime=1618664999.0 h2-4.2.0/visualizer/visualize.py0000644000076500000240000001661614036557047016176 0ustar00kriechistaff# -*- coding: utf-8 -*- """ State Machine Visualizer ~~~~~~~~~~~~~~~~~~~~~~~~ This code provides a module that can use graphviz to visualise the state machines included in h2. These visualisations can be used as part of the documentation of h2, and as a reference material to understand how the state machines function. The code in this module is heavily inspired by code in Automat, which can be found here: https://github.com/glyph/automat. For details on the licensing of Automat, please see the NOTICES.visualizer file in this folder. This module is very deliberately not shipped with the rest of h2. This is because it is of minimal value to users who are installing h2: its use is only really for the developers of h2. """ import argparse import collections import sys import graphviz import graphviz.files import h2.connection import h2.stream StateMachine = collections.namedtuple( 'StateMachine', ['fqdn', 'machine', 'states', 'inputs', 'transitions'] ) # This is all the state machines we currently know about and will render. # If any new state machines are added, they should be inserted here. STATE_MACHINES = [ StateMachine( fqdn='h2.connection.H2ConnectionStateMachine', machine=h2.connection.H2ConnectionStateMachine, states=h2.connection.ConnectionState, inputs=h2.connection.ConnectionInputs, transitions=h2.connection.H2ConnectionStateMachine._transitions, ), StateMachine( fqdn='h2.stream.H2StreamStateMachine', machine=h2.stream.H2StreamStateMachine, states=h2.stream.StreamState, inputs=h2.stream.StreamInputs, transitions=h2.stream._transitions, ), ] def quote(s): return '"{}"'.format(s.replace('"', r'\"')) def html(s): return '<{}>'.format(s) def element(name, *children, **attrs): """ Construct a string from the HTML element description. """ formatted_attributes = ' '.join( '{}={}'.format(key, quote(str(value))) for key, value in sorted(attrs.items()) ) formatted_children = ''.join(children) return u'<{name} {attrs}>{children}'.format( name=name, attrs=formatted_attributes, children=formatted_children ) def row_for_output(event, side_effect): """ Given an output tuple (an event and its side effect), generates a table row from it. """ point_size = {'point-size': '9'} event_cell = element( "td", element("font", enum_member_name(event), **point_size) ) side_effect_name = ( function_name(side_effect) if side_effect is not None else "None" ) side_effect_cell = element( "td", element("font", side_effect_name, **point_size) ) return element("tr", event_cell, side_effect_cell) def table_maker(initial_state, final_state, outputs, port): """ Construct an HTML table to label a state transition. """ header = "{} -> {}".format( enum_member_name(initial_state), enum_member_name(final_state) ) header_row = element( "tr", element( "td", element( "font", header, face="menlo-italic" ), port=port, colspan="2", ) ) rows = [header_row] rows.extend(row_for_output(*output) for output in outputs) return element("table", *rows) def enum_member_name(state): """ All enum member names have the form .. For our rendering we only want the member name, so we take their representation and split it. """ return str(state).split('.', 1)[1] def function_name(func): """ Given a side-effect function, return its string name. """ return func.__name__ def build_digraph(state_machine): """ Produce a L{graphviz.Digraph} object from a state machine. """ digraph = graphviz.Digraph(node_attr={'fontname': 'Menlo'}, edge_attr={'fontname': 'Menlo'}, graph_attr={'dpi': '200'}) # First, add the states as nodes. seen_first_state = False for state in state_machine.states: if not seen_first_state: state_shape = "bold" font_name = "Menlo-Bold" else: state_shape = "" font_name = "Menlo" digraph.node(enum_member_name(state), fontame=font_name, shape="ellipse", style=state_shape, color="blue") seen_first_state = True # We frequently have vary many inputs that all trigger the same state # transition, and only differ in terms of their input and side-effect. It # would be polite to say that graphviz does not handle this very well. So # instead we *collapse* the state transitions all into the one edge, and # then provide a label that displays a table of all the inputs and their # associated side effects. transitions = collections.defaultdict(list) for transition in state_machine.transitions.items(): initial_state, event = transition[0] side_effect, final_state = transition[1] transition_key = (initial_state, final_state) transitions[transition_key].append((event, side_effect)) for n, (transition_key, outputs) in enumerate(transitions.items()): this_transition = "t{}".format(n) initial_state, final_state = transition_key port = "tableport" table = table_maker( initial_state=initial_state, final_state=final_state, outputs=outputs, port=port ) digraph.node(this_transition, label=html(table), margin="0.2", shape="none") digraph.edge(enum_member_name(initial_state), '{}:{}:w'.format(this_transition, port), arrowhead="none") digraph.edge('{}:{}:e'.format(this_transition, port), enum_member_name(final_state)) return digraph def main(): """ Renders all the state machines in h2 into images. """ program_name = sys.argv[0] argv = sys.argv[1:] description = """ Visualize h2 state machines as graphs. """ epilog = """ You must have the graphviz tool suite installed. Please visit http://www.graphviz.org for more information. """ argument_parser = argparse.ArgumentParser( prog=program_name, description=description, epilog=epilog ) argument_parser.add_argument( '--image-directory', '-i', help="Where to write out image files.", default=".h2_visualize" ) argument_parser.add_argument( '--view', '-v', help="View rendered graphs with default image viewer", default=False, action="store_true" ) args = argument_parser.parse_args(argv) for state_machine in STATE_MACHINES: print(state_machine.fqdn, '...discovered') digraph = build_digraph(state_machine) if args.image_directory: digraph.format = "png" digraph.render(filename="{}.dot".format(state_machine.fqdn), directory=args.image_directory, view=args.view, cleanup=True) print(state_machine.fqdn, "...wrote image into", args.image_directory) if __name__ == '__main__': main()

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