2 var polyfills = require('./polyfills.js')
3 var legacy = require('./legacy-streams.js')
4 var clone = require('./clone.js')
6 var util = require('util')
8 /* istanbul ignore next - node 0.x polyfill */
12 /* istanbul ignore else - node 0.x polyfill */
13 if (typeof Symbol === 'function' && typeof Symbol.for === 'function') {
14 gracefulQueue = Symbol.for('graceful-fs.queue')
15 // This is used in testing by future versions
16 previousSymbol = Symbol.for('graceful-fs.previous')
18 gracefulQueue = '___graceful-fs.queue'
19 previousSymbol = '___graceful-fs.previous'
24 function publishQueue(context, queue) {
25 Object.defineProperty(context, gracefulQueue, {
34 debug = util.debuglog('gfs4')
35 else if (/\bgfs4\b/i.test(process.env.NODE_DEBUG || ''))
37 var m = util.format.apply(util, arguments)
38 m = 'GFS4: ' + m.split(/\n/).join('\nGFS4: ')
42 // Once time initialization
43 if (!fs[gracefulQueue]) {
44 // This queue can be shared by multiple loaded instances
45 var queue = global[gracefulQueue] || []
46 publishQueue(fs, queue)
48 // Patch fs.close/closeSync to shared queue version, because we need
49 // to retry() whenever a close happens *anywhere* in the program.
50 // This is essential when multiple graceful-fs instances are
51 // in play at the same time.
52 fs.close = (function (fs$close) {
53 function close (fd, cb) {
54 return fs$close.call(fs, fd, function (err) {
55 // This function uses the graceful-fs shared queue
60 if (typeof cb === 'function')
61 cb.apply(this, arguments)
65 Object.defineProperty(close, previousSymbol, {
71 fs.closeSync = (function (fs$closeSync) {
72 function closeSync (fd) {
73 // This function uses the graceful-fs shared queue
74 fs$closeSync.apply(fs, arguments)
78 Object.defineProperty(closeSync, previousSymbol, {
84 if (/\bgfs4\b/i.test(process.env.NODE_DEBUG || '')) {
85 process.on('exit', function() {
86 debug(fs[gracefulQueue])
87 require('assert').equal(fs[gracefulQueue].length, 0)
92 if (!global[gracefulQueue]) {
93 publishQueue(global, fs[gracefulQueue]);
96 module.exports = patch(clone(fs))
97 if (process.env.TEST_GRACEFUL_FS_GLOBAL_PATCH && !fs.__patched) {
98 module.exports = patch(fs)
102 function patch (fs) {
103 // Everything that references the open() function needs to be in here
105 fs.gracefulify = patch
107 fs.createReadStream = createReadStream
108 fs.createWriteStream = createWriteStream
109 var fs$readFile = fs.readFile
110 fs.readFile = readFile
111 function readFile (path, options, cb) {
112 if (typeof options === 'function')
113 cb = options, options = null
115 return go$readFile(path, options, cb)
117 function go$readFile (path, options, cb) {
118 return fs$readFile(path, options, function (err) {
119 if (err && (err.code === 'EMFILE' || err.code === 'ENFILE'))
120 enqueue([go$readFile, [path, options, cb]])
122 if (typeof cb === 'function')
123 cb.apply(this, arguments)
130 var fs$writeFile = fs.writeFile
131 fs.writeFile = writeFile
132 function writeFile (path, data, options, cb) {
133 if (typeof options === 'function')
134 cb = options, options = null
136 return go$writeFile(path, data, options, cb)
138 function go$writeFile (path, data, options, cb) {
139 return fs$writeFile(path, data, options, function (err) {
140 if (err && (err.code === 'EMFILE' || err.code === 'ENFILE'))
141 enqueue([go$writeFile, [path, data, options, cb]])
143 if (typeof cb === 'function')
144 cb.apply(this, arguments)
151 var fs$appendFile = fs.appendFile
153 fs.appendFile = appendFile
154 function appendFile (path, data, options, cb) {
155 if (typeof options === 'function')
156 cb = options, options = null
158 return go$appendFile(path, data, options, cb)
160 function go$appendFile (path, data, options, cb) {
161 return fs$appendFile(path, data, options, function (err) {
162 if (err && (err.code === 'EMFILE' || err.code === 'ENFILE'))
163 enqueue([go$appendFile, [path, data, options, cb]])
165 if (typeof cb === 'function')
166 cb.apply(this, arguments)
173 var fs$readdir = fs.readdir
175 function readdir (path, options, cb) {
177 if (typeof options !== 'function') {
182 args.push(go$readdir$cb)
184 return go$readdir(args)
186 function go$readdir$cb (err, files) {
187 if (files && files.sort)
190 if (err && (err.code === 'EMFILE' || err.code === 'ENFILE'))
191 enqueue([go$readdir, [args]])
194 if (typeof cb === 'function')
195 cb.apply(this, arguments)
201 function go$readdir (args) {
202 return fs$readdir.apply(fs, args)
205 if (process.version.substr(0, 4) === 'v0.8') {
206 var legStreams = legacy(fs)
207 ReadStream = legStreams.ReadStream
208 WriteStream = legStreams.WriteStream
211 var fs$ReadStream = fs.ReadStream
213 ReadStream.prototype = Object.create(fs$ReadStream.prototype)
214 ReadStream.prototype.open = ReadStream$open
217 var fs$WriteStream = fs.WriteStream
218 if (fs$WriteStream) {
219 WriteStream.prototype = Object.create(fs$WriteStream.prototype)
220 WriteStream.prototype.open = WriteStream$open
223 Object.defineProperty(fs, 'ReadStream', {
227 set: function (val) {
233 Object.defineProperty(fs, 'WriteStream', {
237 set: function (val) {
245 var FileReadStream = ReadStream
246 Object.defineProperty(fs, 'FileReadStream', {
248 return FileReadStream
250 set: function (val) {
256 var FileWriteStream = WriteStream
257 Object.defineProperty(fs, 'FileWriteStream', {
259 return FileWriteStream
261 set: function (val) {
262 FileWriteStream = val
268 function ReadStream (path, options) {
269 if (this instanceof ReadStream)
270 return fs$ReadStream.apply(this, arguments), this
272 return ReadStream.apply(Object.create(ReadStream.prototype), arguments)
275 function ReadStream$open () {
277 open(that.path, that.flags, that.mode, function (err, fd) {
282 that.emit('error', err)
285 that.emit('open', fd)
291 function WriteStream (path, options) {
292 if (this instanceof WriteStream)
293 return fs$WriteStream.apply(this, arguments), this
295 return WriteStream.apply(Object.create(WriteStream.prototype), arguments)
298 function WriteStream$open () {
300 open(that.path, that.flags, that.mode, function (err, fd) {
303 that.emit('error', err)
306 that.emit('open', fd)
311 function createReadStream (path, options) {
312 return new fs.ReadStream(path, options)
315 function createWriteStream (path, options) {
316 return new fs.WriteStream(path, options)
319 var fs$open = fs.open
321 function open (path, flags, mode, cb) {
322 if (typeof mode === 'function')
323 cb = mode, mode = null
325 return go$open(path, flags, mode, cb)
327 function go$open (path, flags, mode, cb) {
328 return fs$open(path, flags, mode, function (err, fd) {
329 if (err && (err.code === 'EMFILE' || err.code === 'ENFILE'))
330 enqueue([go$open, [path, flags, mode, cb]])
332 if (typeof cb === 'function')
333 cb.apply(this, arguments)
343 function enqueue (elem) {
344 debug('ENQUEUE', elem[0].name, elem[1])
345 fs[gracefulQueue].push(elem)
349 var elem = fs[gracefulQueue].shift()
351 debug('RETRY', elem[0].name, elem[1])
352 elem[0].apply(null, elem[1])