125 lines
2.9 KiB
JavaScript
125 lines
2.9 KiB
JavaScript
/*!
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* ws: a node.js websocket client
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* Copyright(c) 2011 Einar Otto Stangvik <einaros@gmail.com>
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* MIT Licensed
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*/
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var events = require('events')
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, util = require('util')
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, EventEmitter = events.EventEmitter;
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/**
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* Hixie Sender implementation
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*/
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function Sender(socket) {
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if (this instanceof Sender === false) {
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throw new TypeError("Classes can't be function-called");
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}
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events.EventEmitter.call(this);
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this.socket = socket;
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this.continuationFrame = false;
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this.isClosed = false;
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}
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module.exports = Sender;
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/**
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* Inherits from EventEmitter.
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*/
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util.inherits(Sender, events.EventEmitter);
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/**
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* Frames and writes data.
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*
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* @api public
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*/
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Sender.prototype.send = function(data, options, cb) {
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if (this.isClosed) return;
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var isString = typeof data == 'string'
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, length = isString ? Buffer.byteLength(data) : data.length
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, lengthbytes = (length > 127) ? 2 : 1 // assume less than 2**14 bytes
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, writeStartMarker = this.continuationFrame == false
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, writeEndMarker = !options || !(typeof options.fin != 'undefined' && !options.fin)
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, buffer = new Buffer((writeStartMarker ? ((options && options.binary) ? (1 + lengthbytes) : 1) : 0) + length + ((writeEndMarker && !(options && options.binary)) ? 1 : 0))
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, offset = writeStartMarker ? 1 : 0;
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if (writeStartMarker) {
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if (options && options.binary) {
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buffer.write('\x80', 'binary');
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// assume length less than 2**14 bytes
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if (lengthbytes > 1)
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buffer.write(String.fromCharCode(128+length/128), offset++, 'binary');
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buffer.write(String.fromCharCode(length&0x7f), offset++, 'binary');
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} else
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buffer.write('\x00', 'binary');
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}
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if (isString) buffer.write(data, offset, 'utf8');
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else data.copy(buffer, offset, 0);
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if (writeEndMarker) {
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if (options && options.binary) {
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// sending binary, not writing end marker
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} else
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buffer.write('\xff', offset + length, 'binary');
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this.continuationFrame = false;
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}
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else this.continuationFrame = true;
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try {
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this.socket.write(buffer, 'binary', cb);
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} catch (e) {
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this.error(e.toString());
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}
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};
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/**
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* Sends a close instruction to the remote party.
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*
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* @api public
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*/
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Sender.prototype.close = function(code, data, mask, cb) {
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if (this.isClosed) return;
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this.isClosed = true;
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try {
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if (this.continuationFrame) this.socket.write(new Buffer([0xff], 'binary'));
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this.socket.write(new Buffer([0xff, 0x00]), 'binary', cb);
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} catch (e) {
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this.error(e.toString());
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}
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};
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/**
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* Sends a ping message to the remote party. Not available for hixie.
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*
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* @api public
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*/
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Sender.prototype.ping = function(data, options) {};
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/**
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* Sends a pong message to the remote party. Not available for hixie.
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*
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* @api public
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*/
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Sender.prototype.pong = function(data, options) {};
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/**
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* Handles an error
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*
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* @api private
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*/
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Sender.prototype.error = function (reason) {
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this.emit('error', reason);
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return this;
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};
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