/*! * ws: a node.js websocket client * Copyright(c) 2011 Einar Otto Stangvik * MIT Licensed */ var events = require('events') , util = require('util') , EventEmitter = events.EventEmitter; /** * Hixie Sender implementation */ function Sender(socket) { this.socket = socket; this.continuationFrame = false; this.isClosed = false; } module.exports = Sender; /** * Inherits from EventEmitter. */ util.inherits(Sender, events.EventEmitter); /** * Frames and writes data. * * @api public */ Sender.prototype.send = function(data, options, cb) { if (this.isClosed) return; if (options && options.binary) { this.error('hixie websockets do not support binary'); return; } var isString = typeof data == 'string' , length = isString ? Buffer.byteLength(data) : data.length , writeStartMarker = this.continuationFrame == false , writeEndMarker = !options || !(typeof options.fin != 'undefined' && !options.fin) , buffer = new Buffer((writeStartMarker ? 1 : 0) + length + (writeEndMarker ? 1 : 0)) , offset = writeStartMarker ? 1 : 0; if (writeStartMarker) buffer.write('\x00', 'binary'); if (isString) buffer.write(data, offset, 'utf8'); else data.copy(buffer, offset, 0); if (writeEndMarker) { buffer.write('\xff', offset + length, 'binary'); this.continuationFrame = false; } else this.continuationFrame = true; try { return this.socket.write(buffer, 'binary', cb); } catch (e) { this.error(e.toString()); } } /** * Sends a close instruction to the remote party. * * @api public */ Sender.prototype.close = function(code, data, mask, cb) { if (this.isClosed) return; this.isClosed = true; try { if (this.continuationFrame) this.socket.write(new Buffer([0xff], 'binary')); return this.socket.write(new Buffer([0xff, 0x00]), 'binary', cb); } catch (e) { this.error(e.toString()); } } /** * Sends a ping message to the remote party. Not available for hixie. * * @api public */ Sender.prototype.ping = function(data, options) {} /** * Sends a pong message to the remote party. Not available for hixie. * * @api public */ Sender.prototype.pong = function(data, options) {} /** * Handles an error * * @api private */ Sender.prototype.error = function (reason) { this.emit('error', reason); return this; }