86 lines
2.1 KiB
JavaScript
86 lines
2.1 KiB
JavaScript
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var fs = require('fs')
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var lockFile = require('../')
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var test = require('tap').test
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var path = require('path')
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var lock = path.resolve(__dirname, 'stale.lock')
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var touch = require('touch')
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var spawn = require('child_process').spawn
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var node = process.execPath
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// We're using a lockfile with an artificially old date,
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// so make it use that instead of ctime.
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// Probably you should never do this in production!
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lockFile.filetime = 'mtime'
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if (process.argv[2] === 'child') {
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return child()
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}
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function child () {
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// Make fs.stat take 100ms to return its data
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// This is important because, in a test scenario where
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// we're statting the same exact file rapid-fire like this,
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// it'll end up being cached by the FS, and never trigger
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// the race condition we're trying to expose.
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fs.stat = function (stat) { return function () {
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var args = [].slice.call(arguments)
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var cb = args.pop()
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stat.apply(fs, args.concat(function(er, st) {
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setTimeout(function () {
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cb(er, st)
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}, 100)
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}))
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}}(fs.stat)
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lockFile.lock(lock, { stale: 100000 }, function (er) {
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if (er && er.code !== 'EEXIST')
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throw er
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else if (er)
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process.exit(17)
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else
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setTimeout(function(){}, 500)
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})
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}
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test('create stale file', function (t) {
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try { fs.unlinkSync(lock) } catch (er) {}
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touch.sync(lock, { time: '1979-07-01T19:10:00.000Z' })
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t.end()
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})
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test('contenders', function (t) {
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var n = 10
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var fails = 0
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var wins = 0
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var args = [ __filename, 'child' ]
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var opt = { stdio: [0, "pipe", 2] }
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for (var i = 0; i < n; i++) {
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spawn(node, args, opt).on('close', then)
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}
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function then (code) {
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if (code === 17) {
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fails ++
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} else if (code) {
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t.fail("unexpected failure", code)
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fails ++
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} else {
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wins ++
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}
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if (fails + wins === n) {
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done()
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}
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}
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function done () {
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t.equal(wins, 1, "should have 1 lock winner")
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t.equal(fails, n - 1, "all others should lose")
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t.end()
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}
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})
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test('remove stale file', function (t) {
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try { fs.unlinkSync(lock) } catch (er) {}
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t.end()
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})
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