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90 lines
2.2 KiB
90 lines
2.2 KiB
'use strict';
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var EventEmitter = require('events').EventEmitter
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, inherits = require('inherits')
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, urlUtils = require('./utils/url')
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, XDR = require('./transport/sender/xdr')
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, XHRCors = require('./transport/sender/xhr-cors')
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, XHRLocal = require('./transport/sender/xhr-local')
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, XHRFake = require('./transport/sender/xhr-fake')
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, InfoIframe = require('./info-iframe')
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, InfoAjax = require('./info-ajax')
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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:info-receiver');
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}
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function InfoReceiver(baseUrl, urlInfo) {
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debug(baseUrl);
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var self = this;
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EventEmitter.call(this);
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setTimeout(function() {
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self.doXhr(baseUrl, urlInfo);
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}, 0);
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}
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inherits(InfoReceiver, EventEmitter);
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// TODO this is currently ignoring the list of available transports and the whitelist
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InfoReceiver._getReceiver = function(baseUrl, url, urlInfo) {
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// determine method of CORS support (if needed)
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if (urlInfo.sameOrigin) {
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return new InfoAjax(url, XHRLocal);
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}
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if (XHRCors.enabled) {
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return new InfoAjax(url, XHRCors);
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}
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if (XDR.enabled && urlInfo.sameScheme) {
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return new InfoAjax(url, XDR);
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}
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if (InfoIframe.enabled()) {
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return new InfoIframe(baseUrl, url);
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}
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return new InfoAjax(url, XHRFake);
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};
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InfoReceiver.prototype.doXhr = function(baseUrl, urlInfo) {
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var self = this
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, url = urlUtils.addPath(baseUrl, '/info')
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;
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debug('doXhr', url);
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this.xo = InfoReceiver._getReceiver(baseUrl, url, urlInfo);
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this.timeoutRef = setTimeout(function() {
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debug('timeout');
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self._cleanup(false);
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self.emit('finish');
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}, InfoReceiver.timeout);
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this.xo.once('finish', function(info, rtt) {
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debug('finish', info, rtt);
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self._cleanup(true);
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self.emit('finish', info, rtt);
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});
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};
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InfoReceiver.prototype._cleanup = function(wasClean) {
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debug('_cleanup');
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clearTimeout(this.timeoutRef);
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this.timeoutRef = null;
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if (!wasClean && this.xo) {
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this.xo.close();
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}
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this.xo = null;
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};
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InfoReceiver.prototype.close = function() {
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debug('close');
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this.removeAllListeners();
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this._cleanup(false);
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};
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InfoReceiver.timeout = 8000;
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module.exports = InfoReceiver;
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