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Request.XHRStreaming = new Class({
Extends: Request,
lastTextLength: 0,
read: 0, //Contain the amout of data read
send: function(options) {
//mootools set onreadystatechange after xhr.open. In webkit, this cause readyState 1 to be never fired
if (Browser.Engine.webkit) this.xhr.onreadystatechange = this.onStateChange.bind(this);
return this.parent(options);
},
onStateChange: function() {
if (this.xhr.readyState == 1) this.dataSent = true;
else if (this.xhr.readyState == 3) this.progress(this.xhr.responseText, this.xhr.responseXML);
this.parent();
},
onProgress: function(){
this.fireEvent('progress', arguments);
},
progress: function(text, xml){
var length = text.length;
this.read += length;
text = text.substr(this.lastTextLength);
this.lastTextLength = length;
this.onProgress(this.processScripts(text), xml);
}
});
APE.Transport.XHRStreaming = new Class({
maxRequestSize: 100000,
Implements: APE.Request.SSE,
initialize: function(ape){
this.ape = ape;
this.requestFailObserver = [];
//If browser support servent sent event, switch to SSE / XHR transport
if (this.SSESupport) this.ape.options.transport = 4;
this.streamInfo = {
timeoutObserver: null,
cleanClose: false,
forceClose: false,
callback: null
}
},
send: function(queryString, options) {
if (this.SSESupport && !this.eventSource) {
this.initSSE(queryString, options, this.readSSE.bind(this));
if (options.requestCallback) this.streamInfo.callback = options.requestCallback;
} else {
if ((!this.streamRequest || !this.streamRequest.running) && !this.eventSource) { //Only one XHRstreaming request is allowed
this.buffer = '';
this.request = this.doRequest(queryString, options);
if (options.requestCallback) this.streamInfo.callback = options.requestCallback;
} else { //Simple XHR request
var request = new Request({
url: this.ape.serverUri,
onFailure: this.ape.requestFail.bind(this.ape, [-2, this]),
onComplete: function(resp) {
$clear(this.requestFailObserver.shift());
this.request.dataSent = true;//In the case of XHRStreaming. Request are imediatly close.
this.ape.parseResponse(resp, options.callback);
}.bind(this)
}).send(queryString);
this.request = request;
//set up an observer to detect request timeout
this.requestFailObserver.push(this.ape.requestFail.delay(this.ape.options.pollTime + 10000, this.ape, [1, request]));
}
return this.request;
}
},
doRequest: function(queryString, options) {
this.streamInfo.forceClose = false;
var request = new Request.XHRStreaming({
url: this.ape.serverUri,
onProgress: this.readFragment.bindWithEvent(this),
onFailure: this.ape.requestFail.bind(this.ape, [-2, this]),
onComplete: function(resp) {
$clear(this.streamInfo.timeoutObserver);
if (this.ape.status > 0) {
if (this.streamInfo.cleanClose) this.ape.check();
else this.newStream();
this.streamInfo.cleanClose = false;
}
}.bind(this)
}).send(queryString);
request.id = $time();
this.streamRequest = request;
//this should no longer exist
//this.streamInfo.timeoutObserver = (function() {
// this.streamInfo.forceClose = true;
// //try to imediatly close stream
// if (this.checkStream()) this.newStream();
//}).delay(1000*60, this);
return request;
},
readSSE: function(data) {
this.ape.parseResponse(data, this.streamInfo.callback);
this.streamInfo.callback = null;
},
readFragment: function(text){
this.streamInfo.canClose = false;
if (text == '') {
this.streamInfo.canClose = true;
this.streamInfo.cleanClose = true;
this.ape.parseResponse(text, this.streamInfo.callback);
this.streamInfo.callback = null;
} else {
text = this.buffer + text;
var group = text.split("\n\n");
var length = group.length;
// If group.length is gretter than 1 the fragment received complete last RAW or contains more than one RAW
if (group.length > 1) {
//Clear buffer
this.buffer = '';
for (var i = 0; i < length-1; i++) {
this.ape.parseResponse(group[i], this.streamInfo.callback);
}
if (group[length-1] !== '') { //Last group complete last received raw but it's not finish
this.buffer += group[length-1];
} else { //Received fragment is complete
this.streamInfo.canClose = true;
if (this.checkStream()) this.newStream();
}
//Delete callback
this.streamInfo.callback = null;
} else {//Fragement received is a part of a raw
this.buffer = text;
}
}
},
running: function() {
return (this.streamRequest && this.streamRequest.running) ? true : this.eventSource ? true : false;
},
checkStream: function() {
return (this.streamInfo.forceClose && this.streamInfo.canClose) || (this.streamRequest && this.streamRequest.read >= this.maxRequestSize && this.streamInfo.canClose);
},
newStream: function() {
// this.ape.request.send('CLOSE');//This will close the stream request
$clear(this.streamInfo.timeoutObserver);
this.streamRequest.cancel();
this.ape.check();
},
cancel: function(){
if (this.request) this.request.cancel();
$clear(this.streamInfo.timeoutObserver);
$clear(this.requestFailObserver.shift());
}
});
APE.Transport.XHRStreaming.browserSupport = function() {
if (Browser.Features.xhr && (Browser.Engine.webkit || Browser.Engine.gecko)) {
return true;
/* Not yet
if (Browser.Engine.presto && ((typeof window.addEventStream) == 'function')) return true;
else if (window.XDomainRequest) return true;
else return Browser.Engine.trident ? 0 : true;
*/
} else if (Browser.Features.xhr) return 0;//No XHRStreaming support switch to long polling
else return 2;//No XHR Support, switch to JSONP
}
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