pax_global_header00006660000000000000000000000064132652405400014513gustar00rootroot0000000000000052 comment=2b44eb1b34593505c0b9189622a9cff42085be43 lockfile-1.0.4/000077500000000000000000000000001326524054000133055ustar00rootroot00000000000000lockfile-1.0.4/.gitignore000066400000000000000000000000451326524054000152740ustar00rootroot00000000000000.nyc_output/ coverage/ node_modules/ lockfile-1.0.4/.travis.yml000066400000000000000000000001761326524054000154220ustar00rootroot00000000000000language: node_js sudo: false node_js: - 8 - 6 - 4 notifications: email: false cache: directories: - $HOME/.npm lockfile-1.0.4/CHANGELOG.md000066400000000000000000000031561326524054000151230ustar00rootroot00000000000000# Changes ## v1.0.3 * handle the case where callback is not passed by user ## v1.0.2 * git ignore coverage and node_modules * update tap to v7 * build a changelog * package: fix repository link * pass tests on 0.8 * before_script needs to be before_install * tap 1.2.0 and travis ## v1.0.1 * isc license * updated README.md ## v1.0.0 * Simulate staleness instead of waiting excessively * whitespace * manage 'retries' so it does not clash with 'wait' polling * manage 'wait' timer properly * Get rid of the excessive Object.create opts shadowing stuff * failing test for the time taken for retries + wait options * doc: add pollPeriod, correct opts.wait * Fixed #6: polling period should be configurable ## v0.4.3 * Implement race-resistant stale lock detection * set req id to 1 to start out ## v0.4.2 * stale option fix for windows file tunneling ## v0.4.1 * Fix version parsing ## v0.4.0 * Don't keep lockfiles open ## v0.3.4 * retry more aggressively ## v0.3.3 * Add debugging function ## v0.3.2 * remove console.error ## v0.3.1 * Support lack of subsecond fs precision * Fix error closure overwriting in notStale ## v0.3.0 * Use polling instead of watchers * Add more overhead buffer to contention test ## v0.2.2 * Fix wait calculation * fixup * Style: prefer early return to giant if/else * unlock: Close before unlinking * Don't get tripped up by locks named 'hasOwnProperty' * test: Pathological extreme lock contention * refactor license ## 0.2.1 * Handle race conditions more thoroughly ## 0.2.0 * Rename to 'lockfile' ## 0.0.2 * Add retries * bsd ## 0.0.1 * tests * package.json * the code * first lockfile-1.0.4/LICENSE000066400000000000000000000013751326524054000143200ustar00rootroot00000000000000The ISC License Copyright (c) Isaac Z. Schlueter and Contributors Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies. THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. lockfile-1.0.4/README.md000066400000000000000000000040361326524054000145670ustar00rootroot00000000000000# lockfile A very polite lock file utility, which endeavors to not litter, and to wait patiently for others. ## Usage ```javascript var lockFile = require('lockfile') // opts is optional, and defaults to {} lockFile.lock('some-file.lock', opts, function (er) { // if the er happens, then it failed to acquire a lock. // if there was not an error, then the file was created, // and won't be deleted until we unlock it. // do my stuff, free of interruptions // then, some time later, do: lockFile.unlock('some-file.lock', function (er) { // er means that an error happened, and is probably bad. }) }) ``` ## Methods Sync methods return the value/throw the error, others don't. Standard node fs stuff. All known locks are removed when the process exits. Of course, it's possible for certain types of failures to cause this to fail, but a best effort is made to not be a litterbug. ### lockFile.lock(path, [opts], cb) Acquire a file lock on the specified path ### lockFile.lockSync(path, [opts]) Acquire a file lock on the specified path ### lockFile.unlock(path, cb) Close and unlink the lockfile. ### lockFile.unlockSync(path) Close and unlink the lockfile. ### lockFile.check(path, [opts], cb) Check if the lockfile is locked and not stale. Callback is called with `cb(error, isLocked)`. ### lockFile.checkSync(path, [opts]) Check if the lockfile is locked and not stale. Returns boolean. ## Options ### opts.wait A number of milliseconds to wait for locks to expire before giving up. Only used by lockFile.lock. Poll for `opts.wait` ms. If the lock is not cleared by the time the wait expires, then it returns with the original error. ### opts.pollPeriod When using `opts.wait`, this is the period in ms in which it polls to check if the lock has expired. Defaults to `100`. ### opts.stale A number of milliseconds before locks are considered to have expired. ### opts.retries Used by lock and lockSync. Retry `n` number of times before giving up. ### opts.retryWait Used by lock. Wait `n` milliseconds before retrying. lockfile-1.0.4/gen-changelog.sh000066400000000000000000000003561326524054000163430ustar00rootroot00000000000000#!/bin/bash ( echo '# Changes' echo '' git log --first-parent --pretty=format:'%s' \ | grep -v '^update changelog' \ | perl -p -e 's/^((v?[0-9]+\.?)+)$/\n## \1\n/g' \ | perl -p -e 's/^([^#\s].*)$/* \1/g' )> CHANGELOG.md lockfile-1.0.4/lockfile.js000066400000000000000000000203441326524054000154360ustar00rootroot00000000000000var fs = require('fs') var wx = 'wx' if (process.version.match(/^v0\.[0-6]/)) { var c = require('constants') wx = c.O_TRUNC | c.O_CREAT | c.O_WRONLY | c.O_EXCL } var os = require('os') exports.filetime = 'ctime' if (os.platform() == "win32") { exports.filetime = 'mtime' } var debug var util = require('util') if (util.debuglog) debug = util.debuglog('LOCKFILE') else if (/\blockfile\b/i.test(process.env.NODE_DEBUG)) debug = function() { var msg = util.format.apply(util, arguments) console.error('LOCKFILE %d %s', process.pid, msg) } else debug = function() {} var locks = {} function hasOwnProperty (obj, prop) { return Object.prototype.hasOwnProperty.call(obj, prop) } var onExit = require('signal-exit') onExit(function () { debug('exit listener') // cleanup Object.keys(locks).forEach(exports.unlockSync) }) // XXX https://github.com/joyent/node/issues/3555 // Remove when node 0.8 is deprecated. if (/^v0\.[0-8]\./.test(process.version)) { debug('uncaughtException, version = %s', process.version) process.on('uncaughtException', function H (er) { debug('uncaughtException') var l = process.listeners('uncaughtException').filter(function (h) { return h !== H }) if (!l.length) { // cleanup try { Object.keys(locks).forEach(exports.unlockSync) } catch (e) {} process.removeListener('uncaughtException', H) throw er } }) } exports.unlock = function (path, cb) { debug('unlock', path) // best-effort. unlocking an already-unlocked lock is a noop delete locks[path] fs.unlink(path, function (unlinkEr) { cb && cb() }) } exports.unlockSync = function (path) { debug('unlockSync', path) // best-effort. unlocking an already-unlocked lock is a noop try { fs.unlinkSync(path) } catch (er) {} delete locks[path] } // if the file can be opened in readonly mode, then it's there. // if the error is something other than ENOENT, then it's not. exports.check = function (path, opts, cb) { if (typeof opts === 'function') cb = opts, opts = {} debug('check', path, opts) fs.open(path, 'r', function (er, fd) { if (er) { if (er.code !== 'ENOENT') return cb(er) return cb(null, false) } if (!opts.stale) { return fs.close(fd, function (er) { return cb(er, true) }) } fs.fstat(fd, function (er, st) { if (er) return fs.close(fd, function (er2) { return cb(er) }) fs.close(fd, function (er) { var age = Date.now() - st[exports.filetime].getTime() return cb(er, age <= opts.stale) }) }) }) } exports.checkSync = function (path, opts) { opts = opts || {} debug('checkSync', path, opts) if (opts.wait) { throw new Error('opts.wait not supported sync for obvious reasons') } try { var fd = fs.openSync(path, 'r') } catch (er) { if (er.code !== 'ENOENT') throw er return false } if (!opts.stale) { try { fs.closeSync(fd) } catch (er) {} return true } // file exists. however, might be stale if (opts.stale) { try { var st = fs.fstatSync(fd) } finally { fs.closeSync(fd) } var age = Date.now() - st[exports.filetime].getTime() return (age <= opts.stale) } } var req = 1 exports.lock = function (path, opts, cb) { if (typeof opts === 'function') cb = opts, opts = {} opts.req = opts.req || req++ debug('lock', path, opts) opts.start = opts.start || Date.now() if (typeof opts.retries === 'number' && opts.retries > 0) { debug('has retries', opts.retries) var retries = opts.retries opts.retries = 0 cb = (function (orig) { return function cb (er, fd) { debug('retry-mutated callback') retries -= 1 if (!er || retries < 0) return orig(er, fd) debug('lock retry', path, opts) if (opts.retryWait) setTimeout(retry, opts.retryWait) else retry() function retry () { opts.start = Date.now() debug('retrying', opts.start) exports.lock(path, opts, cb) } }})(cb) } // try to engage the lock. // if this succeeds, then we're in business. fs.open(path, wx, function (er, fd) { if (!er) { debug('locked', path, fd) locks[path] = fd return fs.close(fd, function () { return cb() }) } debug('failed to acquire lock', er) // something other than "currently locked" // maybe eperm or something. if (er.code !== 'EEXIST') { debug('not EEXIST error', er) return cb(er) } // someone's got this one. see if it's valid. if (!opts.stale) return notStale(er, path, opts, cb) return maybeStale(er, path, opts, false, cb) }) debug('lock return') } // Staleness checking algorithm // 1. acquire $lock, fail // 2. stat $lock, find that it is stale // 3. acquire $lock.STALE // 4. stat $lock, assert that it is still stale // 5. unlink $lock // 6. link $lock.STALE $lock // 7. unlink $lock.STALE // On any failure, clean up whatever we've done, and raise the error. function maybeStale (originalEr, path, opts, hasStaleLock, cb) { fs.stat(path, function (statEr, st) { if (statEr) { if (statEr.code === 'ENOENT') { // expired already! opts.stale = false debug('lock stale enoent retry', path, opts) exports.lock(path, opts, cb) return } return cb(statEr) } var age = Date.now() - st[exports.filetime].getTime() if (age <= opts.stale) return notStale(originalEr, path, opts, cb) debug('lock stale', path, opts) if (hasStaleLock) { exports.unlock(path, function (er) { if (er) return cb(er) debug('lock stale retry', path, opts) fs.link(path + '.STALE', path, function (er) { fs.unlink(path + '.STALE', function () { // best effort. if the unlink fails, oh well. cb(er) }) }) }) } else { debug('acquire .STALE file lock', opts) exports.lock(path + '.STALE', opts, function (er) { if (er) return cb(er) maybeStale(originalEr, path, opts, true, cb) }) } }) } function notStale (er, path, opts, cb) { debug('notStale', path, opts) // if we can't wait, then just call it a failure if (typeof opts.wait !== 'number' || opts.wait <= 0) { debug('notStale, wait is not a number') return cb(er) } // poll for some ms for the lock to clear var now = Date.now() var start = opts.start || now var end = start + opts.wait if (end <= now) return cb(er) debug('now=%d, wait until %d (delta=%d)', start, end, end-start) var wait = Math.min(end - start, opts.pollPeriod || 100) var timer = setTimeout(poll, wait) function poll () { debug('notStale, polling', path, opts) exports.lock(path, opts, cb) } } exports.lockSync = function (path, opts) { opts = opts || {} opts.req = opts.req || req++ debug('lockSync', path, opts) if (opts.wait || opts.retryWait) { throw new Error('opts.wait not supported sync for obvious reasons') } try { var fd = fs.openSync(path, wx) locks[path] = fd try { fs.closeSync(fd) } catch (er) {} debug('locked sync!', path, fd) return } catch (er) { if (er.code !== 'EEXIST') return retryThrow(path, opts, er) if (opts.stale) { var st = fs.statSync(path) var ct = st[exports.filetime].getTime() if (!(ct % 1000) && (opts.stale % 1000)) { // probably don't have subsecond resolution. // round up the staleness indicator. // Yes, this will be wrong 1/1000 times on platforms // with subsecond stat precision, but that's acceptable // in exchange for not mistakenly removing locks on // most other systems. opts.stale = 1000 * Math.ceil(opts.stale / 1000) } var age = Date.now() - ct if (age > opts.stale) { debug('lockSync stale', path, opts, age) exports.unlockSync(path) return exports.lockSync(path, opts) } } // failed to lock! debug('failed to lock', path, opts, er) return retryThrow(path, opts, er) } } function retryThrow (path, opts, er) { if (typeof opts.retries === 'number' && opts.retries > 0) { var newRT = opts.retries - 1 debug('retryThrow', path, opts, newRT) opts.retries = newRT return exports.lockSync(path, opts) } throw er } 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"directories": { "test": "test" }, "dependencies": { "signal-exit": "^3.0.2" }, "devDependencies": { "tap": "^11.1.3", "touch": "0" }, "scripts": { "test": "tap test/*.js --cov -J", "changelog": "bash gen-changelog.sh", "postversion": "npm run changelog && git add CHANGELOG.md && git commit -m 'update changelog - '${npm_package_version}" }, "repository": { "type": "git", "url": "https://github.com/npm/lockfile.git" }, "keywords": [ "lockfile", "lock", "file", "fs", "O_EXCL" ], "author": "Isaac Z. Schlueter (http://blog.izs.me/)", "license": "ISC", "description": "A very polite lock file utility, which endeavors to not litter, and to wait patiently for others." } lockfile-1.0.4/test/000077500000000000000000000000001326524054000142645ustar00rootroot00000000000000lockfile-1.0.4/test/basic.js000066400000000000000000000206321326524054000157060ustar00rootroot00000000000000var test = require('tap').test var lockFile = require('../lockfile.js') var path = require('path') var fs = require('fs') var touch = require('touch') // On Unix systems, it uses ctime by default for staleness checks, since it's // the most reliable. However, because this test artificially sets some locks // to an earlier time to simulate staleness, we use mtime here. lockFile.filetime = 'mtime' test('setup', function (t) { try { lockFile.unlockSync('basic-lock') } catch (er) {} try { lockFile.unlockSync('sync-lock') } catch (er) {} try { lockFile.unlockSync('never-forget') } catch (er) {} try { lockFile.unlockSync('stale-lock') } catch (er) {} try { lockFile.unlockSync('watch-lock') } catch (er) {} try { lockFile.unlockSync('retry-lock') } catch (er) {} try { lockFile.unlockSync('contentious-lock') } catch (er) {} try { lockFile.unlockSync('stale-wait-lock') } catch (er) {} try { lockFile.unlockSync('stale-windows-lock') } catch (er) {} t.end() }) test('lock contention', function (t) { var gotlocks = 0; var N = 200 var delay = 10 // allow for some time for each lock acquisition and release. // note that raising N higher will mean that the overhead // increases, because we're creating more and more watchers. // irl, you should never have several hundred contenders for a // single lock, so this situation is somewhat pathological. var overhead = 200 var wait = N * overhead + delay // first make it locked, so that everyone has to wait lockFile.lock('contentious-lock', function(er, lock) { t.ifError(er, 'acquiring starter') if (er) throw er; t.pass('acquired starter lock') setTimeout(function() { lockFile.unlock('contentious-lock', function (er) { t.ifError(er, 'unlocking starter') if (er) throw er t.pass('unlocked starter') }) }, delay) }) for (var i=0; i < N; i++) lockFile.lock('contentious-lock', { wait: wait }, function(er, lock) { if (er) throw er; lockFile.unlock('contentious-lock', function(er) { if (er) throw er gotlocks++ t.pass('locked and unlocked #' + gotlocks) if (gotlocks === N) { t.pass('got all locks') t.end() } }) }) }) test('basic test', function (t) { lockFile.check('basic-lock', function (er, locked) { if (er) throw er t.notOk(locked) lockFile.lock('basic-lock', function (er) { if (er) throw er lockFile.lock('basic-lock', function (er) { t.ok(er) lockFile.check('basic-lock', function (er, locked) { if (er) throw er t.ok(locked) lockFile.unlock('basic-lock', function (er) { if (er) throw er lockFile.check('basic-lock', function (er, locked) { if (er) throw er t.notOk(locked) t.end() }) }) }) }) }) }) }) test('sync test', function (t) { var locked locked = lockFile.checkSync('sync-lock') t.notOk(locked) lockFile.lockSync('sync-lock') locked = lockFile.checkSync('sync-lock') t.ok(locked) lockFile.unlockSync('sync-lock') locked = lockFile.checkSync('sync-lock') t.notOk(locked) t.end() }) test('exit cleanup test', function (t) { var child = require.resolve('./fixtures/child.js') var node = process.execPath var spawn = require('child_process').spawn spawn(node, [child]).on('exit', function () { setTimeout(function () { var locked = lockFile.checkSync('never-forget') t.notOk(locked) t.end() }, 100) }) }) test('error exit cleanup test', function (t) { var child = require.resolve('./fixtures/bad-child.js') var node = process.execPath var spawn = require('child_process').spawn spawn(node, [child]).on('exit', function () { setTimeout(function () { var locked = lockFile.checkSync('never-forget') t.notOk(locked) t.end() }, 100) }) }) test('staleness test', function (t) { lockFile.lock('stale-lock', function (er) { if (er) throw er // simulate 2s old touch.sync('stale-lock', { time: new Date(Date.now() - 2000) }) var opts = { stale: 1 } lockFile.check('stale-lock', opts, function (er, locked) { if (er) throw er t.notOk(locked) lockFile.lock('stale-lock', opts, function (er) { if (er) throw er lockFile.unlock('stale-lock', function (er) { if (er) throw er t.end() }) }) }) }) }) test('staleness sync test', function (t) { var opts = { stale: 1 } lockFile.lockSync('stale-lock') // simulate 2s old touch.sync('stale-lock', { time: new Date(Date.now() - 2000) }) var locked locked = lockFile.checkSync('stale-lock', opts) t.notOk(locked) lockFile.lockSync('stale-lock', opts) lockFile.unlockSync('stale-lock') t.end() }) test('retries', function (t) { // next 5 opens will fail. var opens = 5 fs._open = fs.open fs.open = function (path, mode, cb) { if (--opens === 0) { fs.open = fs._open return fs.open(path, mode, cb) } var er = new Error('bogus') // to be, or not to be, that is the question. er.code = opens % 2 ? 'EEXIST' : 'ENOENT' process.nextTick(cb.bind(null, er)) } lockFile.lock('retry-lock', { retries: opens }, function (er) { if (er) throw er t.equal(opens, 0) lockFile.unlockSync('retry-lock') t.end() }) }) test('retryWait', function (t) { // next 5 opens will fail. var opens = 5 fs._open = fs.open fs.open = function (path, mode, cb) { if (--opens === 0) { fs.open = fs._open return fs.open(path, mode, cb) } var er = new Error('bogus') // to be, or not to be, that is the question. er.code = opens % 2 ? 'EEXIST' : 'ENOENT' process.nextTick(cb.bind(null, er)) } var opts = { retries: opens, retryWait: 100 } lockFile.lock('retry-lock', opts, function (er) { if (er) throw er t.equal(opens, 0) lockFile.unlockSync('retry-lock') t.end() }) }) test('retry sync', function (t) { // next 5 opens will fail. var opens = 5 fs._openSync = fs.openSync fs.openSync = function (path, mode) { if (--opens === 0) { fs.openSync = fs._openSync return fs.openSync(path, mode) } var er = new Error('bogus') // to be, or not to be, that is the question. er.code = opens % 2 ? 'EEXIST' : 'ENOENT' throw er } var opts = { retries: opens } lockFile.lockSync('retry-lock', opts) t.equal(opens, 0) lockFile.unlockSync('retry-lock') t.end() }) test('wait and stale together', function (t) { // first locker. var interval lockFile.lock('stale-wait-lock', function(er) { // keep refreshing the lock, so we keep it forever interval = setInterval(function() { touch.sync('stale-wait-lock') }, 10) // try to get another lock. this must fail! var opt = { stale: 1000, wait: 2000, pollInterval: 1000 } lockFile.lock('stale-wait-lock', opt, function (er) { if (!er) t.fail('got second lock? that unpossible!') else t.pass('second lock failed, as i have foreseen it') clearInterval(interval) t.end() }) }) }) test('stale windows file tunneling test', function (t) { // for windows only // nt file system tunneling feature will make file creation time not updated var opts = { stale: 1000 } lockFile.lockSync('stale-windows-lock') touch.sync('stale-windows-lock', { time: new Date(Date.now() - 3000) }) var locked lockFile.unlockSync('stale-windows-lock') lockFile.lockSync('stale-windows-lock', opts) locked = lockFile.checkSync('stale-windows-lock', opts) t.ok(locked, "should be locked and not stale") lockFile.lock('stale-windows-lock', opts, function (er) { if (!er) t.fail('got second lock? impossible, windows file tunneling problem!') else t.pass('second lock failed, windows file tunneling problem fixed') t.end() }) }) test('cleanup', function (t) { try { lockFile.unlockSync('basic-lock') } catch (er) {} try { lockFile.unlockSync('sync-lock') } catch (er) {} try { lockFile.unlockSync('never-forget') } catch (er) {} try { lockFile.unlockSync('stale-lock') } catch (er) {} try { lockFile.unlockSync('watch-lock') } catch (er) {} try { lockFile.unlockSync('retry-lock') } catch (er) {} try { lockFile.unlockSync('contentious-lock') } catch (er) {} try { lockFile.unlockSync('stale-wait-lock') } catch (er) {} try { lockFile.unlockSync('stale-windows-lock') } catch (er) {} t.end() }) lockfile-1.0.4/test/fixtures/000077500000000000000000000000001326524054000161355ustar00rootroot00000000000000lockfile-1.0.4/test/fixtures/bad-child.js000066400000000000000000000001561326524054000203040ustar00rootroot00000000000000var lockFile = require('../../lockfile.js') lockFile.lockSync('never-forget') throw new Error('waaaaaaaaa') lockfile-1.0.4/test/fixtures/child.js000066400000000000000000000001331326524054000175530ustar00rootroot00000000000000var lockFile = require('../../lockfile.js') lockFile.lock('never-forget', function () {}) lockfile-1.0.4/test/retry-time.js000066400000000000000000000030071326524054000167230ustar00rootroot00000000000000// In these tests, we do the following: // try for 200ms (rt=2) // wait for 300ms // try for 200ms (rt=1) // wait for 300ms // try for 200ms (rt=0) // fail after 1200 // Actual time will be more like 1220-ish for setTimeout irregularity // But it should NOT be as slow as 2000. var lockFile = require('../') var touch = require('touch') var test = require('tap').test var fs = require('fs') var RETRYWAIT = 100 var WAIT = 100 var RETRIES = 2 var EXPECTTIME = (RETRYWAIT * RETRIES) + (WAIT * (RETRIES + 1)) var TOOLONG = EXPECTTIME * 1.5 test('setup', function (t) { touch.sync('file.lock') t.end() }) var pollPeriods = [10, 100, 10000] pollPeriods.forEach(function (pp) { test('retry+wait, poll=' + pp, function (t) { var ended = false var timer = setTimeout(function() { t.fail('taking too long!') ended = true t.end() }, 2000) if (timer.unref) timer.unref() var start = Date.now() lockFile.lock('file.lock', { wait: WAIT, retries: RETRIES, retryWait: RETRYWAIT, pollPeriod: pp }, function (er) { if (ended) return var time = Date.now() - start t.ok(time >= EXPECTTIME, 'should take at least ' + EXPECTTIME) t.ok(time < TOOLONG, 'should take less than ' + TOOLONG) clearTimeout(timer) t.end() }) }) }) test('cleanup', function (t) { fs.unlinkSync('file.lock') t.end() var timer = setTimeout(function() { process.exit(1) }, 500) if (timer.unref) timer.unref() else clearTimeout(timer) }) lockfile-1.0.4/test/stale-contention.js000066400000000000000000000040701326524054000201110ustar00rootroot00000000000000var fs = require('fs') var lockFile = require('../') var test = require('tap').test var path = require('path') var lock = path.resolve(__dirname, 'stale.lock') var touch = require('touch') var spawn = require('child_process').spawn var node = process.execPath // We're using a lockfile with an artificially old date, // so make it use that instead of ctime. // Probably you should never do this in production! lockFile.filetime = 'mtime' if (process.argv[2] === 'child') { return child() } function child () { // Make fs.stat take 100ms to return its data // This is important because, in a test scenario where // we're statting the same exact file rapid-fire like this, // it'll end up being cached by the FS, and never trigger // the race condition we're trying to expose. fs.stat = function (stat) { return function () { var args = [].slice.call(arguments) var cb = args.pop() stat.apply(fs, args.concat(function(er, st) { setTimeout(function () { cb(er, st) }, 100) })) }}(fs.stat) lockFile.lock(lock, { stale: 100000 }, function (er) { if (er && er.code !== 'EEXIST') throw er else if (er) process.exit(17) else setTimeout(function(){}, 500) }) } test('create stale file', function (t) { try { fs.unlinkSync(lock) } catch (er) {} touch.sync(lock, { time: '1979-07-01T19:10:00.000Z' }) t.end() }) test('contenders', function (t) { var n = 10 var fails = 0 var wins = 0 var args = [ __filename, 'child' ] var opt = { stdio: [0, "pipe", 2] } for (var i = 0; i < n; i++) { spawn(node, args, opt).on('close', then) } function then (code) { if (code === 17) { fails ++ } else if (code) { t.fail("unexpected failure", code) fails ++ } else { wins ++ } if (fails + wins === n) { done() } } function done () { t.equal(wins, 1, "should have 1 lock winner") t.equal(fails, n - 1, "all others should lose") t.end() } }) test('remove stale file', function (t) { try { fs.unlinkSync(lock) } catch (er) {} t.end() }) lockfile-1.0.4/test/unlock-no-cb.js000066400000000000000000000004351326524054000171130ustar00rootroot00000000000000var t = require('tap') if (/0\.(10|8)/.test(process.version)) { t.pass('just a dummy test, no beforeExit in this node version') } else { process.on('beforeExit', function (code) { t.equal(code, 0, 'did not throw') }) } var lf = require('lockfile') lf.unlock('no-file-no-cb')