hexo/node_modules/atomically/test/concurrency.js

154 lines
4.5 KiB
JavaScript

'use strict'
process.setMaxListeners(1000000);
const fs = require('fs')
const {test} = require('tap')
const requireInject = require('require-inject')
// defining mock for fs so its functions can be modified
const fsMock = Object.assign ( {}, fs, {
/* ASYNC */
mkdir (filename, opts, cb) {
return cb(null);
},
realpath (filename, cb) {
return cb(null, filename)
},
open (tmpfile, options, mode, cb) {
if (/noopen/.test(tmpfile)) return cb(new Error('ENOOPEN'))
cb(null, tmpfile)
},
write (fd) {
const cb = arguments[arguments.length - 1]
if (/nowrite/.test(fd)) return cb(new Error('ENOWRITE'))
cb()
},
fsync (fd, cb) {
if (/nofsync/.test(fd)) return cb(new Error('ENOFSYNC'))
cb()
},
close (fd, cb) {
cb()
},
chown (tmpfile, uid, gid, cb) {
if (/nochown/.test(tmpfile)) return cb(new Error('ENOCHOWN'))
cb()
},
chmod (tmpfile, mode, cb) {
if (/nochmod/.test(tmpfile)) return cb(new Error('ENOCHMOD'))
cb()
},
rename (tmpfile, filename, cb) {
if (/norename/.test(tmpfile)) return cb(new Error('ENORENAME'))
cb()
},
unlink (tmpfile, cb) {
if (/nounlink/.test(tmpfile)) return cb(new Error('ENOUNLINK'))
cb()
},
stat (tmpfile, cb) {
if (/nostat/.test(tmpfile)) return cb(new Error('ENOSTAT'))
cb()
},
/* SYNC */
mkdirSync (filename) {},
realpathSync (filename, cb) {
return filename
},
openSync (tmpfile, options) {
if (/noopen/.test(tmpfile)) throw new Error('ENOOPEN')
return tmpfile
},
writeSync (fd) {
if (/nowrite/.test(fd)) throw new Error('ENOWRITE')
},
fsyncSync (fd) {
if (/nofsync/.test(fd)) throw new Error('ENOFSYNC')
},
closeSync () {},
chownSync (tmpfile, uid, gid) {
if (/nochown/.test(tmpfile)) throw new Error('ENOCHOWN')
},
chmodSync (tmpfile, mode) {
if (/nochmod/.test(tmpfile)) throw new Error('ENOCHMOD')
},
renameSync (tmpfile, filename) {
if (/norename/.test(tmpfile)) throw new Error('ENORENAME')
},
unlinkSync (tmpfile) {
if (/nounlink/.test(tmpfile)) throw new Error('ENOUNLINK')
},
statSync (tmpfile) {
if (/nostat/.test(tmpfile)) throw new Error('ENOSTAT')
}
})
const {writeFile: writeFileAtomic} = requireInject('../dist', { fs: fsMock });
// preserve original functions
const oldRealPath = fsMock.realpath
const oldRename = fsMock.rename
test('ensure writes to the same file are serial', t => {
let fileInUse = false
const ops = 5 // count for how many concurrent write ops to request
t.plan(ops * 3 + 3)
fsMock.realpath = (...args) => {
t.false(fileInUse, 'file not in use')
fileInUse = true
oldRealPath(...args)
}
fsMock.rename = (...args) => {
t.true(fileInUse, 'file in use')
fileInUse = false
oldRename(...args)
}
const {writeFile: writeFileAtomic} = requireInject('../dist', { fs: fsMock });
for (let i = 0; i < ops; i++) {
writeFileAtomic('test', 'test', err => {
if (err) t.fail(err)
else t.pass('wrote without error')
})
}
setTimeout(() => {
writeFileAtomic('test', 'test', err => {
if (err) t.fail(err)
else t.pass('successive writes after delay')
})
}, 500)
})
test('allow write to multiple files in parallel, but same file writes are serial', t => {
const filesInUse = []
const ops = 5
let wasParallel = false
fsMock.realpath = (filename, ...args) => {
filesInUse.push(filename)
const firstOccurence = filesInUse.indexOf(filename)
t.equal(filesInUse.indexOf(filename, firstOccurence + 1), -1, 'serial writes') // check for another occurence after the first
if (filesInUse.length > 1) wasParallel = true // remember that a parallel operation took place
oldRealPath(filename, ...args)
}
fsMock.rename = (filename, ...args) => {
filesInUse.splice(filesInUse.indexOf(filename), 1)
oldRename(filename, ...args)
}
const {writeFile: writeFileAtomic} = requireInject('../dist', { fs: fsMock });
t.plan(ops * 2 * 2 + 1)
let opCount = 0
for (let i = 0; i < ops; i++) {
writeFileAtomic('test', 'test', err => {
if (err) t.fail(err, 'wrote without error')
else t.pass('wrote without error')
})
writeFileAtomic('test2', 'test', err => {
opCount++
if (opCount === ops) t.true(wasParallel, 'parallel writes')
if (err) t.fail(err, 'wrote without error')
else t.pass('wrote without error')
})
}
})