var assert = require('assert')
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var util = require('util')
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var EventEmitter = require('events').EventEmitter
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var Buffer = require('buffer').Buffer
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var Queue = require('./queue')
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// Node.js version
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var match = /^v(\d+)\.(\d+)\./.exec(process.version)
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var version = match ? Number(match[1]) + Number('0.' + match[2]) : 11
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var onreadMode = version >= 11.1 ? 2 : 1
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var mode = 'modern'
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var setNRead
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if (onreadMode === 2) {
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var sw = process.binding('stream_wrap')
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setNRead = function (nread) {
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sw.streamBaseState[sw.kReadBytesOrError] = nread
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}
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}
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function Handle (stream, options) {
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EventEmitter.call(this)
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this._stream = stream
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this._flowing = false
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this._reading = false
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this._options = options || {}
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this.onread = null
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// Pending requests
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this.pending = new Queue()
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}
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util.inherits(Handle, EventEmitter)
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module.exports = Handle
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Handle.mode = mode
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Handle.create = function create (stream, options) {
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return new Handle(stream, options)
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}
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Handle.prototype._onread = function _onread (nread, buffer) {
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if (onreadMode === 1) {
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this.onread(nread, buffer)
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} else {
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setNRead(nread)
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this.onread(buffer)
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}
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}
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Handle.prototype._queueReq = function _queueReq (type, req) {
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return this.pending.append(type, req)
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}
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Handle.prototype._pendingList = function _pendingList () {
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var list = []
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while (!this.pending.isEmpty()) { list.push(this.pending.first().dequeue()) }
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return list
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}
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Handle.prototype.setStream = function setStream (stream) {
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assert(this._stream === null, 'Can\'t set stream two times')
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this._stream = stream
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this.emit('stream', stream)
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}
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Handle.prototype.readStart = function readStart () {
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this._reading = true
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if (!this._stream) {
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this.once('stream', this.readStart)
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return 0
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}
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if (!this._flowing) {
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this._flowing = true
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this._flow()
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}
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this._stream.resume()
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return 0
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}
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Handle.prototype.readStop = function readStop () {
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this._reading = false
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if (!this._stream) {
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this.once('stream', this.readStop)
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return 0
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}
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this._stream.pause()
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return 0
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}
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var uv = process.binding('uv')
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Handle.prototype._flow = function flow () {
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var self = this
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this._stream.on('data', function (chunk) {
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self._onread(chunk.length, chunk)
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})
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this._stream.on('end', function () {
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self._onread(uv.UV_EOF, Buffer.alloc(0))
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})
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this._stream.on('close', function () {
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setImmediate(function () {
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if (self._reading) {
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self._onread(uv.UV_ECONNRESET, Buffer.alloc(0))
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}
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})
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})
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}
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Handle.prototype._close = function _close () {
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var list = this._pendingList()
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var self = this
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setImmediate(function () {
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for (var i = 0; i < list.length; i++) {
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var req = list[i]
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req.oncomplete(uv.UV_ECANCELED, self, req)
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}
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})
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this.readStop()
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}
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Handle.prototype.shutdown = function shutdown (req) {
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var wrap = this._queueReq('shutdown', req)
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if (!this._stream) {
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this.once('stream', function () {
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this._shutdown(wrap)
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})
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return 0
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}
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return this._shutdown(wrap)
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}
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Handle.prototype._shutdown = function _shutdown (wrap) {
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var self = this
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this._stream.end(function () {
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var req = wrap.dequeue()
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if (!req) { return }
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req.oncomplete(0, self, req)
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})
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return 0
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}
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Handle.prototype.close = function close (callback) {
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this._close()
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if (!this._stream) {
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this.once('stream', function () {
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this.close(callback)
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})
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return 0
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}
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if (this._options.close) {
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this._options.close(callback)
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} else {
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process.nextTick(callback)
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}
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return 0
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}
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Handle.prototype.writeEnc = function writeEnc (req, data, enc) {
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var wrap = this._queueReq('write', req)
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if (!this._stream) {
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this.once('stream', function () {
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this._writeEnc(wrap, req, data, enc)
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})
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return 0
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}
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return this._writeEnc(wrap, req, data, enc)
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}
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Handle.prototype._writeEnc = function _writeEnc (wrap, req, data, enc) {
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var self = this
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req.async = true
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req.bytes = data.length
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if (wrap.isEmpty()) {
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return 0
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}
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this._stream.write(data, enc, function () {
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var req = wrap.dequeue()
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if (!req) { return }
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req.oncomplete(0, self, req)
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})
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return 0
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}
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/**
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* @param {WriteWrap} req
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* @param {string[]} chunks
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* @param {Boolean} allBuffers
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*/
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Handle.prototype.writev = function _writev (req, chunks, allBuffers) {
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while (chunks.length > 0) {
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this._stream.write(chunks.shift(), chunks.shift())
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}
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return 0
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}
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Handle.prototype.writeBuffer = function writeBuffer (req, data) {
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return this.writeEnc(req, data, null)
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}
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Handle.prototype.writeAsciiString = function writeAsciiString (req, data) {
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return this.writeEnc(req, data, 'ascii')
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}
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Handle.prototype.writeUtf8String = function writeUtf8String (req, data) {
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return this.writeEnc(req, data, 'utf8')
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}
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Handle.prototype.writeUcs2String = function writeUcs2String (req, data) {
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return this.writeEnc(req, data, 'ucs2')
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}
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Handle.prototype.writeBinaryString = function writeBinaryString (req, data) {
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return this.writeEnc(req, data, 'binary')
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}
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Handle.prototype.writeLatin1String = function writeLatin1String (req, data) {
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return this.writeEnc(req, data, 'binary')
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}
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// v0.8
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Handle.prototype.getsockname = function getsockname () {
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if (this._options.getPeerName) {
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return this._options.getPeerName()
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}
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return null
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}
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Handle.prototype.getpeername = function getpeername (out) {
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var res = this.getsockname()
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if (!res) { return -1 }
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Object.keys(res).forEach(function (key) {
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out[key] = res[key]
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})
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return 0
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}
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