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✏️ Editing: graceful-fs.js

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) {
          resetQueue()
        }

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)
      resetQueue()
    }

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$readFile (path, options, cb, startTime) {
      return fs$readFile(path, options, function (err) {
        if (err && (err.code === 'EMFILE' || err.code === 'ENFILE'))
          enqueue([go$readFile, [path, options, cb], err, startTime || Date.now(), Date.now()])
        else {
          if (typeof cb === 'function')
            cb.apply(this, arguments)
        }
      })
    }
  }

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$writeFile (path, data, options, cb, startTime) {
      return fs$writeFile(path, data, options, function (err) {
        if (err && (err.code === 'EMFILE' || err.code === 'ENFILE'))
          enqueue([go$writeFile, [path, data, options, cb], err, startTime || Date.now(), Date.now()])
        else {
          if (typeof cb === 'function')
            cb.apply(this, arguments)
        }
      })
    }
  }

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$appendFile (path, data, options, cb, startTime) {
      return fs$appendFile(path, data, options, function (err) {
        if (err && (err.code === 'EMFILE' || err.code === 'ENFILE'))
          enqueue([go$appendFile, [path, data, options, cb], err, startTime || Date.now(), Date.now()])
        else {
          if (typeof cb === 'function')
            cb.apply(this, arguments)
        }
      })
    }
  }

var fs$copyFile = fs.copyFile
  if (fs$copyFile)
    fs.copyFile = copyFile
  function copyFile (src, dest, flags, cb) {
    if (typeof flags === 'function') {
      cb = flags
      flags = 0
    }
    return go$copyFile(src, dest, flags, cb)

function go$copyFile (src, dest, flags, cb, startTime) {
      return fs$copyFile(src, dest, flags, function (err) {
        if (err && (err.code === 'EMFILE' || err.code === 'ENFILE'))
          enqueue([go$copyFile, [src, dest, flags, cb], err, startTime || Date.now(), Date.now()])
        else {
          if (typeof cb === 'function')
            cb.apply(this, arguments)
        }
      })
    }
  }

var fs$readdir = fs.readdir
  fs.readdir = readdir
  var noReaddirOptionVersions = /^v[0-5]\./
  function readdir (path, options, cb) {
    if (typeof options === 'function')
      cb = options, options = null

var go$readdir = noReaddirOptionVersions.test(process.version)
      ? function go$readdir (path, options, cb, startTime) {
        return fs$readdir(path, fs$readdirCallback(
          path, options, cb, startTime
        ))
      }
      : function go$readdir (path, options, cb, startTime) {
        return fs$readdir(path, options, fs$readdirCallback(
          path, options, cb, startTime
        ))
      }

return go$readdir(path, options, cb)

function fs$readdirCallback (path, options, cb, startTime) {
      return function (err, files) {
        if (err && (err.code === 'EMFILE' || err.code === 'ENFILE'))
          enqueue([
            go$readdir,
            [path, options, cb],
            err,
            startTime || Date.now(),
            Date.now()
          ])
        else {
          if (files && files.sort)
            files.sort()

if (typeof cb === 'function')
            cb.call(this, err, files)
        }
      }
    }
  }

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$open (path, flags, mode, cb, startTime) {
      return fs$open(path, flags, mode, function (err, fd) {
        if (err && (err.code === 'EMFILE' || err.code === 'ENFILE'))
          enqueue([go$open, [path, flags, mode, cb], err, startTime || Date.now(), Date.now()])
        else {
          if (typeof cb === 'function')
            cb.apply(this, arguments)
        }
      })
    }
  }

return fs
}

function enqueue (elem) {
  debug('ENQUEUE', elem[0].name, elem[1])
  fs[gracefulQueue].push(elem)
  retry()
}

// keep track of the timeout between retry() calls
var retryTimer

// reset the startTime and lastTime to now
// this resets the start of the 60 second overall timeout as well as the
// delay between attempts so that we'll retry these jobs sooner
function resetQueue () {
  var now = Date.now()
  for (var i = 0; i < fs[gracefulQueue].length; ++i) {
    // entries that are only a length of 2 are from an older version, don't
    // bother modifying those since they'll be retried anyway.
    if (fs[gracefulQueue][i].length > 2) {
      fs[gracefulQueue][i][3] = now // startTime
      fs[gracefulQueue][i][4] = now // lastTime
    }
  }
  // call retry to make sure we're actively processing the queue
  retry()
}

function retry () {
  // clear the timer and remove it to help prevent unintended concurrency
  clearTimeout(retryTimer)
  retryTimer = undefined

if (fs[gracefulQueue].length === 0)
    return

var elem = fs[gracefulQueue].shift()
  var fn = elem[0]
  var args = elem[1]
  // these items may be unset if they were added by an older graceful-fs
  var err = elem[2]
  var startTime = elem[3]
  var lastTime = elem[4]

// if we don't have a startTime we have no way of knowing if we've waited
  // long enough, so go ahead and retry this item now
  if (startTime === undefined) {
    debug('RETRY', fn.name, args)
    fn.apply(null, args)
  } else if (Date.now() - startTime >= 60000) {
    // it's been more than 60 seconds total, bail now
    debug('TIMEOUT', fn.name, args)
    var cb = args.pop()
    if (typeof cb === 'function')
      cb.call(null, err)
  } else {
    // the amount of time between the last attempt and right now
    var sinceAttempt = Date.now() - lastTime
    // the amount of time between when we first tried, and when we last tried
    // rounded up to at least 1
    var sinceStart = Math.max(lastTime - startTime, 1)
    // backoff. wait longer than the total time we've been retrying, but only
    // up to a maximum of 100ms
    var desiredDelay = Math.min(sinceStart * 1.2, 100)
    // it's been long enough since the last retry, do it again
    if (sinceAttempt >= desiredDelay) {
      debug('RETRY', fn.name, args)
      fn.apply(null, args.concat([startTime]))
    } else {
      // if we can't do this job yet, push it to the end of the queue
      // and let the next iteration check again
      fs[gracefulQueue].push(elem)
    }
  }

// schedule our next run if one isn't already scheduled
  if (retryTimer === undefined) {
    retryTimer = setTimeout(retry, 0)
  }
}

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