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