254 lines
6.7 KiB
JavaScript
254 lines
6.7 KiB
JavaScript
![]() |
var fs = require('fs')
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var polyfills = require('./polyfills.js')
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var legacy = require('./legacy-streams.js')
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var queue = []
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var util = require('util')
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function noop () {}
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var debug = noop
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if (util.debuglog)
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debug = util.debuglog('gfs4')
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else if (/\bgfs4\b/i.test(process.env.NODE_DEBUG || ''))
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debug = function() {
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var m = util.format.apply(util, arguments)
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m = 'GFS4: ' + m.split(/\n/).join('\nGFS4: ')
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console.error(m)
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}
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if (/\bgfs4\b/i.test(process.env.NODE_DEBUG || '')) {
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process.on('exit', function() {
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debug(queue)
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require('assert').equal(queue.length, 0)
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})
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}
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module.exports = patch(require('./fs.js'))
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if (process.env.TEST_GRACEFUL_FS_GLOBAL_PATCH) {
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module.exports = patch(fs)
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}
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// Always patch fs.close/closeSync, because we want to
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// retry() whenever a close happens *anywhere* in the program.
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// This is essential when multiple graceful-fs instances are
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// in play at the same time.
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module.exports.close =
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fs.close = (function (fs$close) { return function (fd, cb) {
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return fs$close.call(fs, fd, function (err) {
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if (!err)
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retry()
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if (typeof cb === 'function')
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cb.apply(this, arguments)
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})
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}})(fs.close)
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module.exports.closeSync =
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fs.closeSync = (function (fs$closeSync) { return function (fd) {
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// Note that graceful-fs also retries when fs.closeSync() fails.
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// Looks like a bug to me, although it's probably a harmless one.
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var rval = fs$closeSync.apply(fs, arguments)
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retry()
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return rval
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}})(fs.closeSync)
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function patch (fs) {
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// Everything that references the open() function needs to be in here
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polyfills(fs)
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fs.gracefulify = patch
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fs.FileReadStream = ReadStream; // Legacy name.
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fs.FileWriteStream = WriteStream; // Legacy name.
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fs.createReadStream = createReadStream
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fs.createWriteStream = createWriteStream
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var fs$readFile = fs.readFile
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fs.readFile = readFile
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function readFile (path, options, cb) {
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if (typeof options === 'function')
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cb = options, options = null
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return go$readFile(path, options, cb)
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function go$readFile (path, options, cb) {
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return fs$readFile(path, options, function (err) {
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if (err && (err.code === 'EMFILE' || err.code === 'ENFILE'))
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enqueue([go$readFile, [path, options, cb]])
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else {
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if (typeof cb === 'function')
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cb.apply(this, arguments)
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retry()
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}
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})
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}
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}
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var fs$writeFile = fs.writeFile
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fs.writeFile = writeFile
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function writeFile (path, data, options, cb) {
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if (typeof options === 'function')
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cb = options, options = null
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return go$writeFile(path, data, options, cb)
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function go$writeFile (path, data, options, cb) {
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return fs$writeFile(path, data, options, function (err) {
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if (err && (err.code === 'EMFILE' || err.code === 'ENFILE'))
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enqueue([go$writeFile, [path, data, options, cb]])
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else {
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if (typeof cb === 'function')
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cb.apply(this, arguments)
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retry()
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}
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})
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}
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}
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var fs$appendFile = fs.appendFile
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if (fs$appendFile)
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fs.appendFile = appendFile
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function appendFile (path, data, options, cb) {
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if (typeof options === 'function')
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cb = options, options = null
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return go$appendFile(path, data, options, cb)
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function go$appendFile (path, data, options, cb) {
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return fs$appendFile(path, data, options, function (err) {
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if (err && (err.code === 'EMFILE' || err.code === 'ENFILE'))
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enqueue([go$appendFile, [path, data, options, cb]])
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else {
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if (typeof cb === 'function')
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cb.apply(this, arguments)
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retry()
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}
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})
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}
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}
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var fs$readdir = fs.readdir
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fs.readdir = readdir
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function readdir (path, cb) {
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return go$readdir(path, cb)
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function go$readdir () {
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return fs$readdir(path, function (err, files) {
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if (files && files.sort)
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files.sort(); // Backwards compatibility with graceful-fs.
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if (err && (err.code === 'EMFILE' || err.code === 'ENFILE'))
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enqueue([go$readdir, [path, cb]])
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else {
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if (typeof cb === 'function')
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cb.apply(this, arguments)
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retry()
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}
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})
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}
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}
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if (process.version.substr(0, 4) === 'v0.8') {
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var legStreams = legacy(fs)
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ReadStream = legStreams.ReadStream
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WriteStream = legStreams.WriteStream
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}
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var fs$ReadStream = fs.ReadStream
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ReadStream.prototype = Object.create(fs$ReadStream.prototype)
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ReadStream.prototype.open = ReadStream$open
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var fs$WriteStream = fs.WriteStream
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WriteStream.prototype = Object.create(fs$WriteStream.prototype)
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WriteStream.prototype.open = WriteStream$open
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fs.ReadStream = ReadStream
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fs.WriteStream = WriteStream
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function ReadStream (path, options) {
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if (this instanceof ReadStream)
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return fs$ReadStream.apply(this, arguments), this
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else
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return ReadStream.apply(Object.create(ReadStream.prototype), arguments)
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}
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function ReadStream$open () {
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var that = this
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open(that.path, that.flags, that.mode, function (err, fd) {
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if (err) {
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if (that.autoClose)
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that.destroy()
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that.emit('error', err)
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} else {
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that.fd = fd
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that.emit('open', fd)
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that.read()
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}
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})
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}
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function WriteStream (path, options) {
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if (this instanceof WriteStream)
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return fs$WriteStream.apply(this, arguments), this
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else
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return WriteStream.apply(Object.create(WriteStream.prototype), arguments)
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}
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function WriteStream$open () {
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var that = this
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open(that.path, that.flags, that.mode, function (err, fd) {
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if (err) {
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that.destroy()
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that.emit('error', err)
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} else {
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that.fd = fd
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that.emit('open', fd)
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}
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})
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}
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function createReadStream (path, options) {
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return new ReadStream(path, options)
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}
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function createWriteStream (path, options) {
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return new WriteStream(path, options)
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}
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var fs$open = fs.open
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fs.open = open
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function open (path, flags, mode, cb) {
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if (typeof mode === 'function')
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cb = mode, mode = null
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return go$open(path, flags, mode, cb)
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function go$open (path, flags, mode, cb) {
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return fs$open(path, flags, mode, function (err, fd) {
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if (err && (err.code === 'EMFILE' || err.code === 'ENFILE'))
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enqueue([go$open, [path, flags, mode, cb]])
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else {
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if (typeof cb === 'function')
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cb.apply(this, arguments)
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retry()
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}
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})
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}
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}
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return fs
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}
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function enqueue (elem) {
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debug('ENQUEUE', elem[0].name, elem[1])
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queue.push(elem)
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}
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function retry () {
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var elem = queue.shift()
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if (elem) {
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debug('RETRY', elem[0].name, elem[1])
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elem[0].apply(null, elem[1])
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}
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}
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