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107 lines
2.5 KiB
107 lines
2.5 KiB
module.exports = FileWriter |
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var fs = require('graceful-fs') |
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var Writer = require('./writer.js') |
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var inherits = require('inherits') |
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var EOF = {} |
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inherits(FileWriter, Writer) |
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function FileWriter (props) { |
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var self = this |
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if (!(self instanceof FileWriter)) { |
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throw new Error('FileWriter must be called as constructor.') |
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} |
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// should already be established as a File type |
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if (props.type !== 'File' || !props.File) { |
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throw new Error('Non-file type ' + props.type) |
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} |
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self._buffer = [] |
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self._bytesWritten = 0 |
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Writer.call(this, props) |
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} |
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FileWriter.prototype._create = function () { |
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var self = this |
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if (self._stream) return |
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var so = {} |
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if (self.props.flags) so.flags = self.props.flags |
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so.mode = Writer.filemode |
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if (self._old && self._old.blksize) so.bufferSize = self._old.blksize |
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self._stream = fs.createWriteStream(self._path, so) |
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self._stream.on('open', function () { |
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// console.error("FW open", self._buffer, self._path) |
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self.ready = true |
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self._buffer.forEach(function (c) { |
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if (c === EOF) self._stream.end() |
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else self._stream.write(c) |
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}) |
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self.emit('ready') |
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// give this a kick just in case it needs it. |
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self.emit('drain') |
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}) |
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self._stream.on('error', function (er) { self.emit('error', er) }) |
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self._stream.on('drain', function () { self.emit('drain') }) |
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self._stream.on('close', function () { |
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// console.error('\n\nFW Stream Close', self._path, self.size) |
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self._finish() |
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}) |
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} |
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FileWriter.prototype.write = function (c) { |
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var self = this |
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self._bytesWritten += c.length |
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if (!self.ready) { |
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if (!Buffer.isBuffer(c) && typeof c !== 'string') { |
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throw new Error('invalid write data') |
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} |
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self._buffer.push(c) |
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return false |
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} |
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var ret = self._stream.write(c) |
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// console.error('\t-- fw wrote, _stream says', ret, self._stream._queue.length) |
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// allow 2 buffered writes, because otherwise there's just too |
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// much stop and go bs. |
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if (ret === false && self._stream._queue) { |
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return self._stream._queue.length <= 2 |
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} else { |
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return ret |
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} |
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} |
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FileWriter.prototype.end = function (c) { |
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var self = this |
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if (c) self.write(c) |
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if (!self.ready) { |
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self._buffer.push(EOF) |
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return false |
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} |
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return self._stream.end() |
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} |
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FileWriter.prototype._finish = function () { |
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var self = this |
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if (typeof self.size === 'number' && self._bytesWritten !== self.size) { |
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self.error( |
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'Did not get expected byte count.\n' + |
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'expect: ' + self.size + '\n' + |
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'actual: ' + self._bytesWritten) |
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} |
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Writer.prototype._finish.call(self) |
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}
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