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