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| 'use strict';
/*
* ***** BEGIN LICENSE BLOCK *****
* Copyright (c) 2011-2012 VMware, Inc.
*
* For the license see COPYING.
* ***** END LICENSE BLOCK *****
*/
var inherits = require('util').inherits;
var assign = require('lodash.assign');
var contains = require('lodash.contains');
var helpers = require('./helpers.js');
var REventTarget = require('./reventtarget.js');
var SimpleEvent = require('./simpleevent.js');
var InfoReceiver = require('./info-receiver.js');
var jsonParse = require('./safe-json-parse.js');
var protocols = require('./protocols.js');
module.exports = SockJS;
inherits(SockJS, REventTarget);
function SockJS(url, _reserved, options) {
if (!(this instanceof SockJS)) {
return new SockJS(url, _reserved, options);
}
// options should default to empty
this._options = options = options || {};
this._base_url = helpers.amendUrl(url);
this._server = 'server' in options ? options.server : helpers.random_number_string(1000);
this._devel = 'devel' in options ? options.devel : false;
this._debug = 'debug' in options ? options.debug : false;
// only allow whitelist if it is valid
if (options.protocols_whitelist && options.protocols_whitelist.length) {
this._protocols_whitelist = Array.isArray(options.protocols_whitelist) ? options.protocols_whitelist : [options.protocols_whitelist];
} else {
this._protocols_whitelist = [];
}
this._protocols = [];
this.protocol = null;
this.readyState = SockJS.CONNECTING;
createInfoReceiver(this._base_url).on('finish', function (info, rtt) {
if (info) {
Eif (this._options.info) {
// Override if user supplies the option
info = assign(info, this._options.info);
}
this._applyInfo(info, rtt, this._protocols_whitelist);
this._didClose();
} else {
this._didClose(1002, 'Can\'t connect to server', true);
}
}.bind(this));
}
SockJS.version = require('../package.json').version;
'CONNECTING OPEN CLOSING CLOSED'.split(' ').forEach(function (name, i) {
SockJS.prototype[name] = SockJS[name] = i;
});
SockJS.prototype._log = function () {
Eif (this._debug) {
helpers.log.apply(helpers, arguments);
}
};
SockJS.prototype._dispatchOpen = function () {
Eif (this.readyState === SockJS.CONNECTING) {
Iif (this._transport_tref) {
clearTimeout(this._transport_tref);
this._transport_tref = null;
}
this.readyState = SockJS.OPEN;
this.dispatchEvent(new SimpleEvent('open'));
} else {
// The server might have been restarted, and lost track of our
// connection.
this._didClose(1006, 'Server lost session');
}
};
SockJS.prototype._dispatchMessage = function (data) {
Iif (this.readyState !== SockJS.OPEN) {
return;
}
this.dispatchEvent(new SimpleEvent('message', {
data: data
}));
};
SockJS.prototype._dispatchHeartbeat = function () {
if (this.readyState !== SockJS.OPEN){
return;
}
this.dispatchEvent(new SimpleEvent('heartbeat'));
};
SockJS.prototype._didClose = function (code, reason, force) {
var close_event;
if (!contains([ SockJS.CONNECTING, SockJS.OPEN, SockJS.CLOSING ], this.readyState)) {
this.dispatchEvent(new SimpleEvent('error', {
name: 'INVALID_STATE_ERR'
}));
return;
}
if (this._transport) {
this._transport.doCleanup();
this._transport = null;
}
if (!helpers.userSetCode(code) && this.readyState === SockJS.CONNECTING && !force) {
Eif (this._try_next_protocol(close_event)) {
return;
}
close_event = new SimpleEvent('close', {
code: 2000,
reason: 'All transports failed',
wasClean: false,
last_event: close_event
});
} else {
close_event = new SimpleEvent('close', {
code: code,
reason: reason,
wasClean: helpers.userSetCode(code)
});
}
this.readyState = SockJS.CLOSED;
helpers.delay(function () { this.dispatchEvent(close_event); }.bind(this));
};
SockJS.prototype._didMessage = function (data) {
var type = data.slice(0, 1),
payload;
switch (type) {
case 'o':
this._dispatchOpen();
break;
case 'a':
payload = jsonParse(data.slice(1) || '[]');
for (var i = 0; i < payload.length; i++) {
this._dispatchMessage(payload[i]);
}
break;
case 'm':
payload = jsonParse(data.slice(1) || 'null');
this._dispatchMessage(payload);
break;
case 'c':
payload = jsonParse(data.slice(1) || '[]');
this._didClose(payload[0], payload[1]);
break;
case 'h':
this._dispatchHeartbeat();
break;
}
};
SockJS.prototype._try_next_protocol = function (close_event) {
var protocol,
roundTrips,
connid,
trans_url,
to;
var timeoutFunction = function () {
Iif (this.readyState === SockJS.CONNECTING) {
// I can't understand how it is possible to run
// this timer, when the state is CLOSED, but
// apparently in IE everythin is possible.
this._didClose(2007, 'Transport timed out');
}
}.bind(this);
Iif (this.protocol) {
this._log('Closed transport:', this.protocol, ''+close_event);
this.protocol = null;
}
Iif (this._transport_tref) {
clearTimeout(this._transport_tref);
this._transport_tref = null;
}
while (true) {
protocol = this.protocol = this._protocols.shift();
Iif (!protocol) {
return false;
}
Iif (!protocols[protocol] || !protocols[protocol].enabled(this._base_url)) {
this._log('Skipping transport:', protocol);
} else {
roundTrips = protocols[protocol].roundTrips || 1;
to = ((this._rto || 0) * roundTrips) || 5000;
this._transport_tref = helpers.delay(to, timeoutFunction);
connid = helpers.random_string(8);
trans_url = this._base_url + '/' + this._server + '/' + connid;
this._log('Opening transport:', protocol, ' url:' + trans_url, ' RTO:' + this._rto);
this._transport = new protocols[protocol](this, trans_url, this._base_url);
return true;
}
}
};
SockJS.prototype.close = function (code, reason) {
Iif (code && !helpers.userSetCode(code)) {
this.dispatchEvent(new SimpleEvent('error', {
name: 'INVALID_ACCESS_ERR'
}));
return false;
}
Iif (!contains([ SockJS.CONNECTING, SockJS.OPEN ], this.readyState)) {
return false;
}
this.readyState = SockJS.CLOSING;
this._didClose(code || 1000, reason || 'Normal closure');
return true;
};
SockJS.prototype.send = function (data) {
Iif (this.readyState === SockJS.CONNECTING) {
this.dispatchEvent(new SimpleEvent('error', {
name: 'INVALID_STATE_ERR'
}));
return false;
}
Eif (this.readyState === SockJS.OPEN) {
this._transport.doSend(helpers.quote('' + data));
}
return true;
};
SockJS.prototype._applyInfo = function (info, rtt, protocols_whitelist) {
var probed;
this._rtt = rtt;
this._rto = helpers.countRTO(rtt);
// Servers can override base_url, eg to provide a randomized domain name and
// avoid browser per-domain connection limits.
Iif (info.base_url) {
this._base_url = helpers.amendUrl(info.base_url);
}
probed = helpers.probeProtocols(this._base_url);
this._protocols = helpers.detectProtocols(probed, protocols_whitelist, info);
};
function createInfoReceiver(base_url) {
return new InfoReceiver(base_url);
}
|