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Edit File : graceful-fs.js \| Size : 8.75 KB
var fs = require('fs') var polyfills = require('./polyfills.js') var legacy = require('./legacy-streams.js') var clone = require('./clone.js') var util = require('util') /* istanbul ignore next - node 0.x polyfill / var gracefulQueue var previousSymbol / istanbul ignore else - node 0.x polyfill / if (typeof Symbol === 'function' && typeof Symbol.for === 'function') { gracefulQueue = Symbol.for('graceful-fs.queue') // This is used in testing by future versions previousSymbol = Symbol.for('graceful-fs.previous') } else { gracefulQueue = '___graceful-fs.queue' previousSymbol = '___graceful-fs.previous' } function noop () {} function publishQueue(context, queue) { Object.defineProperty(context, gracefulQueue, { get: function() { return queue } }) } 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) } // Once time initialization if (!fs[gracefulQueue]) { // This queue can be shared by multiple loaded instances var queue = global[gracefulQueue] \|\| [] publishQueue(fs, queue) // Patch fs.close/closeSync to shared queue version, because we need // 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. fs.close = (function (fs$close) { function close (fd, cb) { return fs$close.call(fs, fd, function (err) { // This function uses the graceful-fs shared queue if (!err) { retry() } if (typeof cb === 'function') cb.apply(this, arguments) }) } Object.defineProperty(close, previousSymbol, { value: fs$close }) return close })(fs.close) fs.closeSync = (function (fs$closeSync) { function closeSync (fd) { // This function uses the graceful-fs shared queue fs$closeSync.apply(fs, arguments) retry() } Object.defineProperty(closeSync, previousSymbol, { value: fs$closeSync }) return closeSync })(fs.closeSync) if (/\bgfs4\b/i.test(process.env.NODE_DEBUG \|\| '')) { process.on('exit', function() { debug(fs[gracefulQueue]) require('assert').equal(fs[gracefulQueue].length, 0) }) } } if (!global[gracefulQueue]) { publishQueue(global, fs[gracefulQueue]); } module.exports = patch(clone(fs)) if (process.env.TEST_GRACEFUL_FS_GLOBAL_PATCH && !fs.__patched) { module.exports = patch(fs) fs.__patched = true; } function patch (fs) { // Everything that references the open() function needs to be in here polyfills(fs) fs.gracefulify = patch 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$readdir = fs.readdir fs.readdir = readdir function readdir (path, options, cb) { var args = [path] if (typeof options !== 'function') { args.push(options) } else { cb = options } args.push(go$readdir$cb) return go$readdir(args) function go$readdir$cb (err, files) { if (files && files.sort) files.sort() if (err && (err.code === 'EMFILE' \|\| err.code === 'ENFILE')) enqueue([go$readdir, [args]]) else { if (typeof cb === 'function') cb.apply(this, arguments) retry() } } } function go$readdir (args) { return fs$readdir.apply(fs, args) } if (process.version.substr(0, 4) === 'v0.8') { var legStreams = legacy(fs) ReadStream = legStreams.ReadStream WriteStream = legStreams.WriteStream } var fs$ReadStream = fs.ReadStream if (fs$ReadStream) { ReadStream.prototype = Object.create(fs$ReadStream.prototype) ReadStream.prototype.open = ReadStream$open } var fs$WriteStream = fs.WriteStream if (fs$WriteStream) { WriteStream.prototype = Object.create(fs$WriteStream.prototype) WriteStream.prototype.open = WriteStream$open } Object.defineProperty(fs, 'ReadStream', { get: function () { return ReadStream }, set: function (val) { ReadStream = val }, enumerable: true, configurable: true }) Object.defineProperty(fs, 'WriteStream', { get: function () { return WriteStream }, set: function (val) { WriteStream = val }, enumerable: true, configurable: true }) // legacy names var FileReadStream = ReadStream Object.defineProperty(fs, 'FileReadStream', { get: function () { return FileReadStream }, set: function (val) { FileReadStream = val }, enumerable: true, configurable: true }) var FileWriteStream = WriteStream Object.defineProperty(fs, 'FileWriteStream', { get: function () { return FileWriteStream }, set: function (val) { FileWriteStream = val }, enumerable: true, configurable: true }) function ReadStream (path, options) { if (this instanceof ReadStream) return fs$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$open () { var that = this open(that.path, that.flags, that.mode, function (err, fd) { if (err) { that.destroy() that.emit('error', err) } else { that.fd = fd that.emit('open', fd) } }) } function createReadStream (path, options) { return new fs.ReadStream(path, options) } function createWriteStream (path, options) { return new fs.WriteStream(path, options) } var fs$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]) fs[gracefulQueue].push(elem) } function retry () { var elem = fs[gracefulQueue].shift() if (elem) { debug('RETRY', elem[0].name, elem[1]) elem[0].apply(null, elem[1]) } } Back

Edit File : graceful-fs.js | Size : 8.75 KB

var fs = require('fs')
var polyfills = require('./polyfills.js')
var legacy = require('./legacy-streams.js')
var clone = require('./clone.js')

var util = require('util')

/* istanbul ignore next - node 0.x polyfill */
var gracefulQueue
var previousSymbol

/* istanbul ignore else - node 0.x polyfill */
if (typeof Symbol === 'function' && typeof Symbol.for === 'function') {
  gracefulQueue = Symbol.for('graceful-fs.queue')
  // This is used in testing by future versions
  previousSymbol = Symbol.for('graceful-fs.previous')
} else {
  gracefulQueue = '___graceful-fs.queue'
  previousSymbol = '___graceful-fs.previous'
}

function noop () {}

function publishQueue(context, queue) {
  Object.defineProperty(context, gracefulQueue, {
    get: function() {
      return queue
    }
  })
}

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)
  }

// Once time initialization
if (!fs[gracefulQueue]) {
  // This queue can be shared by multiple loaded instances
  var queue = global[gracefulQueue] || []
  publishQueue(fs, queue)

// Patch fs.close/closeSync to shared queue version, because we need
  // 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.
  fs.close = (function (fs$close) {
    function close (fd, cb) {
      return fs$close.call(fs, fd, function (err) {
        // This function uses the graceful-fs shared queue
        if (!err) {
          retry()
        }

if (typeof cb === 'function')
          cb.apply(this, arguments)
      })
    }

Object.defineProperty(close, previousSymbol, {
      value: fs$close
    })
    return close
  })(fs.close)

fs.closeSync = (function (fs$closeSync) {
    function closeSync (fd) {
      // This function uses the graceful-fs shared queue
      fs$closeSync.apply(fs, arguments)
      retry()
    }

Object.defineProperty(closeSync, previousSymbol, {
      value: fs$closeSync
    })
    return closeSync
  })(fs.closeSync)

if (/\bgfs4\b/i.test(process.env.NODE_DEBUG || '')) {
    process.on('exit', function() {
      debug(fs[gracefulQueue])
      require('assert').equal(fs[gracefulQueue].length, 0)
    })
  }
}

if (!global[gracefulQueue]) {
  publishQueue(global, fs[gracefulQueue]);
}

module.exports = patch(clone(fs))
if (process.env.TEST_GRACEFUL_FS_GLOBAL_PATCH && !fs.__patched) {
    module.exports = patch(fs)
    fs.__patched = true;
}

function patch (fs) {
  // Everything that references the open() function needs to be in here
  polyfills(fs)
  fs.gracefulify = patch

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$readdir = fs.readdir
  fs.readdir = readdir
  function readdir (path, options, cb) {
    var args = [path]
    if (typeof options !== 'function') {
      args.push(options)
    } else {
      cb = options
    }
    args.push(go$readdir$cb)

return go$readdir(args)

function go$readdir$cb (err, files) {
      if (files && files.sort)
        files.sort()

if (err && (err.code === 'EMFILE' || err.code === 'ENFILE'))
        enqueue([go$readdir, [args]])

else {
        if (typeof cb === 'function')
          cb.apply(this, arguments)
        retry()
      }
    }
  }

function go$readdir (args) {
    return fs$readdir.apply(fs, args)
  }

if (process.version.substr(0, 4) === 'v0.8') {
    var legStreams = legacy(fs)
    ReadStream = legStreams.ReadStream
    WriteStream = legStreams.WriteStream
  }

var fs$ReadStream = fs.ReadStream
  if (fs$ReadStream) {
    ReadStream.prototype = Object.create(fs$ReadStream.prototype)
    ReadStream.prototype.open = ReadStream$open
  }

var fs$WriteStream = fs.WriteStream
  if (fs$WriteStream) {
    WriteStream.prototype = Object.create(fs$WriteStream.prototype)
    WriteStream.prototype.open = WriteStream$open
  }

Object.defineProperty(fs, 'ReadStream', {
    get: function () {
      return ReadStream
    },
    set: function (val) {
      ReadStream = val
    },
    enumerable: true,
    configurable: true
  })
  Object.defineProperty(fs, 'WriteStream', {
    get: function () {
      return WriteStream
    },
    set: function (val) {
      WriteStream = val
    },
    enumerable: true,
    configurable: true
  })

// legacy names
  var FileReadStream = ReadStream
  Object.defineProperty(fs, 'FileReadStream', {
    get: function () {
      return FileReadStream
    },
    set: function (val) {
      FileReadStream = val
    },
    enumerable: true,
    configurable: true
  })
  var FileWriteStream = WriteStream
  Object.defineProperty(fs, 'FileWriteStream', {
    get: function () {
      return FileWriteStream
    },
    set: function (val) {
      FileWriteStream = val
    },
    enumerable: true,
    configurable: true
  })

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 fs.ReadStream(path, options)
  }

function createWriteStream (path, options) {
    return new fs.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])
  fs[gracefulQueue].push(elem)
}

function retry () {
  var elem = fs[gracefulQueue].shift()
  if (elem) {
    debug('RETRY', elem[0].name, elem[1])
    elem[0].apply(null, elem[1])
  }
}

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