You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
90 lines
2.2 KiB
90 lines
2.2 KiB
4 years ago
|
'use strict';
|
||
|
|
|
||
|
|
var EventEmitter = require('events').EventEmitter
|
||
|
|
, inherits = require('inherits')
|
||
|
|
, urlUtils = require('./utils/url')
|
||
|
|
, XDR = require('./transport/sender/xdr')
|
||
|
|
, XHRCors = require('./transport/sender/xhr-cors')
|
||
|
|
, XHRLocal = require('./transport/sender/xhr-local')
|
||
|
|
, XHRFake = require('./transport/sender/xhr-fake')
|
||
|
|
, InfoIframe = require('./info-iframe')
|
||
|
|
, InfoAjax = require('./info-ajax')
|
||
|
|
;
|
||
|
|
|
||
|
|
var debug = function() {};
|
||
|
|
if (process.env.NODE_ENV !== 'production') {
|
||
|
|
debug = require('debug')('sockjs-client:info-receiver');
|
||
|
|
}
|
||
|
|
|
||
|
|
function InfoReceiver(baseUrl, urlInfo) {
|
||
|
|
debug(baseUrl);
|
||
|
|
var self = this;
|
||
|
|
EventEmitter.call(this);
|
||
|
|
|
||
|
|
setTimeout(function() {
|
||
|
|
self.doXhr(baseUrl, urlInfo);
|
||
|
|
}, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
inherits(InfoReceiver, EventEmitter);
|
||
|
|
|
||
|
|
// TODO this is currently ignoring the list of available transports and the whitelist
|
||
|
|
|
||
|
|
InfoReceiver._getReceiver = function(baseUrl, url, urlInfo) {
|
||
|
|
// determine method of CORS support (if needed)
|
||
|
|
if (urlInfo.sameOrigin) {
|
||
|
|
return new InfoAjax(url, XHRLocal);
|
||
|
|
}
|
||
|
|
if (XHRCors.enabled) {
|
||
|
|
return new InfoAjax(url, XHRCors);
|
||
|
|
}
|
||
|
|
if (XDR.enabled && urlInfo.sameScheme) {
|
||
|
|
return new InfoAjax(url, XDR);
|
||
|
|
}
|
||
|
|
if (InfoIframe.enabled()) {
|
||
|
|
return new InfoIframe(baseUrl, url);
|
||
|
|
}
|
||
|
|
return new InfoAjax(url, XHRFake);
|
||
|
|
};
|
||
|
|
|
||
|
|
InfoReceiver.prototype.doXhr = function(baseUrl, urlInfo) {
|
||
|
|
var self = this
|
||
|
|
, url = urlUtils.addPath(baseUrl, '/info')
|
||
|
|
;
|
||
|
|
debug('doXhr', url);
|
||
|
|
|
||
|
|
this.xo = InfoReceiver._getReceiver(baseUrl, url, urlInfo);
|
||
|
|
|
||
|
|
this.timeoutRef = setTimeout(function() {
|
||
|
|
debug('timeout');
|
||
|
|
self._cleanup(false);
|
||
|
|
self.emit('finish');
|
||
|
|
}, InfoReceiver.timeout);
|
||
|
|
|
||
|
|
this.xo.once('finish', function(info, rtt) {
|
||
|
|
debug('finish', info, rtt);
|
||
|
|
self._cleanup(true);
|
||
|
|
self.emit('finish', info, rtt);
|
||
|
|
});
|
||
|
|
};
|
||
|
|
|
||
|
|
InfoReceiver.prototype._cleanup = function(wasClean) {
|
||
|
|
debug('_cleanup');
|
||
|
|
clearTimeout(this.timeoutRef);
|
||
|
|
this.timeoutRef = null;
|
||
|
|
if (!wasClean && this.xo) {
|
||
|
|
this.xo.close();
|
||
|
|
}
|
||
|
|
this.xo = null;
|
||
|
|
};
|
||
|
|
|
||
|
|
InfoReceiver.prototype.close = function() {
|
||
|
|
debug('close');
|
||
|
|
this.removeAllListeners();
|
||
|
|
this._cleanup(false);
|
||
|
|
};
|
||
|
|
|
||
|
|
InfoReceiver.timeout = 8000;
|
||
|
|
|
||
|
|
module.exports = InfoReceiver;
|