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jsonptransport.js
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jsonptransport.js
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var JSONPTransport = (function() {
var noop = function() {};
var _ = window.Ably._ = function(id) { return _[id] || noop; };
var idCounter = 1;
var head = document.getElementsByTagName('head')[0];
/* public constructor */
function JSONPTransport(connectionManager, auth, params) {
params.stream = false;
CometTransport.call(this, connectionManager, auth, params);
}
Utils.inherits(JSONPTransport, CometTransport);
JSONPTransport.isAvailable = function() { return true; };
ConnectionManager.httpTransports['jsonp'] = ConnectionManager.transports['jsonp'] = JSONPTransport;
/* connectivity check; since this has a hard-coded callback id,
* we just make sure that we handle concurrent requests (but the
* connectionmanager should ensure this doesn't happen anyway */
var checksInProgress = null;
JSONPTransport.checkConnectivity = function(callback) {
if(checksInProgress) {
checksInProgress.push(callback);
return;
}
checksInProgress = [callback];
request('http://internet-up.ably.io.s3-website-us-east-1.amazonaws.com/is-the-internet-up.js', null, null, null, false, function(err, response) {
var result = !err && response;
for(var i = 0; i < checksInProgress.length; i++) checksInProgress[i](null, result);
checksInProgress = null;
});
};
JSONPTransport.tryConnect = function(connectionManager, auth, params, callback) {
var transport = new JSONPTransport(connectionManager, auth, params);
var errorCb = function(err) { callback(err); };
transport.on('error', errorCb);
transport.on('preconnect', function() {
Logger.logAction(Logger.LOG_MINOR, 'JSONPTransport.tryConnect()', 'viable transport ' + transport);
transport.off('error', errorCb);
callback(null, transport);
});
transport.connect();
};
JSONPTransport.prototype.toString = function() {
return 'JSONPTransport; uri=' + this.baseUri + '; isConnected=' + this.isConnected;
};
var createRequest = JSONPTransport.prototype.createRequest = function(uri, headers, params, body, requestMode) {
return new Request(undefined, uri, headers, params, body, requestMode);
}
function Request(id, uri, headers, params, body, requestMode) {
EventEmitter.call(this);
if(id === undefined) id = idCounter++;
this.id = id;
this.uri = uri;
this.params = params || {};
this.body = body;
this.requestMode = requestMode;
this.requestComplete = false;
}
Utils.inherits(Request, EventEmitter);
Request.prototype.exec = function() {
var id = this.id,
body = this.body,
uri = this.uri,
params = this.params,
self = this;
params.callback = 'Ably._(' + id + ')';
if(body)
params.body = body;
else
delete params.body;
var script = this.script = document.createElement('script');
script.src = uri + Utils.toQueryString(params);
script.async = true;
script.type = 'text/javascript';
script.charset = 'UTF-8';
script.onerror = function(err) {
err.code = 80000;
self.complete(err);
};
_[id] = function(message) {
self.complete(null, message);
};
var timeout = (this.requestMode == CometTransport.REQ_SEND) ? Defaults.sendTimeout : Defaults.recvTimeout;
this.timer = setTimeout(function() { self.abort(); }, timeout);
head.insertBefore(script, head.firstChild);
};
Request.prototype.complete = function(err, body) {
if(!this.requestComplete) {
this.requestComplete = true;
if(body)
this.emit('data', body);
this.emit('complete', err, body, true);
this.dispose();
}
};
Request.prototype.abort = function() {
this.dispose();
};
Request.prototype.dispose = function() {
var timer = this.timer;
if(timer) {
clearTimeout(timer);
this.timer = null;
}
var script = this.script;
if(script.parentNode) script.parentNode.removeChild(script);
delete _[this.id];
};
var request = Http.Request = function(uri, headers, params, body, callback) {
var req = createRequest(uri, headers, params, body, CometTransport.REQ_SEND);
req.once('complete', callback);
req.exec();
return req;
};
return JSONPTransport;
})();