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89 lines
2.2 KiB
89 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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