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Viewing file:     file-writer.js (2.53 KB)      -rw-r--r--

module.exports = FileWriter

var fs = require('graceful-fs')
var Writer = require('./writer.js')
var inherits = require('inherits')
var EOF = {}

inherits(FileWriter, Writer)

function FileWriter (props) {
  var self = this
  if (!(self instanceof FileWriter)) {
    throw new Error('FileWriter must be called as constructor.')
  }

  // should already be established as a File type
  if (props.type !== 'File' || !props.File) {
    throw new Error('Non-file type ' + props.type)
  }

  self._buffer = []
  self._bytesWritten = 0

  Writer.call(this, props)
}

FileWriter.prototype._create = function () {
  var self = this
  if (self._stream) return

  var so = {}
  if (self.props.flags) so.flags = self.props.flags
  so.mode = Writer.filemode
  if (self._old && self._old.blksize) so.bufferSize = self._old.blksize

  self._stream = fs.createWriteStream(self._path, so)

  self._stream.on('open', function () {
    // console.error("FW open", self._buffer, self._path)
    self.ready = true
    self._buffer.forEach(function (c) {
      if (c === EOF) self._stream.end()
      else self._stream.write(c)
    })
    self.emit('ready')
    // give this a kick just in case it needs it.
    self.emit('drain')
  })

  self._stream.on('error', function (er) { self.emit('error', er) })

  self._stream.on('drain', function () { self.emit('drain') })

  self._stream.on('close', function () {
    // console.error('\n\nFW Stream Close', self._path, self.size)
    self._finish()
  })
}

FileWriter.prototype.write = function (c) {
  var self = this

  self._bytesWritten += c.length

  if (!self.ready) {
    if (!Buffer.isBuffer(c) && typeof c !== 'string') {
      throw new Error('invalid write data')
    }
    self._buffer.push(c)
    return false
  }

  var ret = self._stream.write(c)
  // console.error('\t-- fw wrote, _stream says', ret, self._stream._queue.length)

  // allow 2 buffered writes, because otherwise there's just too
  // much stop and go bs.
  if (ret === false && self._stream._queue) {
    return self._stream._queue.length <= 2
  } else {
    return ret
  }
}

FileWriter.prototype.end = function (c) {
  var self = this

  if (c) self.write(c)

  if (!self.ready) {
    self._buffer.push(EOF)
    return false
  }

  return self._stream.end()
}

FileWriter.prototype._finish = function () {
  var self = this
  if (typeof self.size === 'number' && self._bytesWritten !== self.size) {
    self.error(
      'Did not get expected byte count.\n' +
      'expect: ' + self.size + '\n' +
      'actual: ' + self._bytesWritten)
  }
  Writer.prototype._finish.call(self)
}