'use strict';
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var utils = require('../utils/event')
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, urlUtils = require('../utils/url')
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, inherits = require('inherits')
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, EventEmitter = require('events').EventEmitter
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, WebsocketDriver = require('./driver/websocket')
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;
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var debug = function() {};
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if (process.env.NODE_ENV !== 'production') {
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debug = require('debug')('sockjs-client:websocket');
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}
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function WebSocketTransport(transUrl, ignore, options) {
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if (!WebSocketTransport.enabled()) {
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throw new Error('Transport created when disabled');
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}
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EventEmitter.call(this);
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debug('constructor', transUrl);
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var self = this;
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var url = urlUtils.addPath(transUrl, '/websocket');
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if (url.slice(0, 5) === 'https') {
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url = 'wss' + url.slice(5);
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} else {
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url = 'ws' + url.slice(4);
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}
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this.url = url;
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this.ws = new WebsocketDriver(this.url, [], options);
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this.ws.onmessage = function(e) {
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debug('message event', e.data);
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self.emit('message', e.data);
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};
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// Firefox has an interesting bug. If a websocket connection is
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// created after onunload, it stays alive even when user
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// navigates away from the page. In such situation let's lie -
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// let's not open the ws connection at all. See:
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// https://github.com/sockjs/sockjs-client/issues/28
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// https://bugzilla.mozilla.org/show_bug.cgi?id=696085
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this.unloadRef = utils.unloadAdd(function() {
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debug('unload');
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self.ws.close();
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});
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this.ws.onclose = function(e) {
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debug('close event', e.code, e.reason);
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self.emit('close', e.code, e.reason);
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self._cleanup();
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};
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this.ws.onerror = function(e) {
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debug('error event', e);
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self.emit('close', 1006, 'WebSocket connection broken');
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self._cleanup();
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};
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}
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inherits(WebSocketTransport, EventEmitter);
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WebSocketTransport.prototype.send = function(data) {
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var msg = '[' + data + ']';
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debug('send', msg);
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this.ws.send(msg);
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};
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WebSocketTransport.prototype.close = function() {
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debug('close');
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var ws = this.ws;
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this._cleanup();
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if (ws) {
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ws.close();
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}
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};
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WebSocketTransport.prototype._cleanup = function() {
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debug('_cleanup');
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var ws = this.ws;
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if (ws) {
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ws.onmessage = ws.onclose = ws.onerror = null;
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}
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utils.unloadDel(this.unloadRef);
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this.unloadRef = this.ws = null;
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this.removeAllListeners();
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};
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WebSocketTransport.enabled = function() {
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debug('enabled');
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return !!WebsocketDriver;
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};
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WebSocketTransport.transportName = 'websocket';
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// In theory, ws should require 1 round trip. But in chrome, this is
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// not very stable over SSL. Most likely a ws connection requires a
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// separate SSL connection, in which case 2 round trips are an
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// absolute minumum.
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WebSocketTransport.roundTrips = 2;
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module.exports = WebSocketTransport;
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