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