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/**
* socket.io
* Copyright(c) 2011 LearnBoost <dev@learnboost.com>
* MIT Licensed
*/
(function (exports, io, global) {
/**
* Expose constructor.
*/
exports.websocket = WS;
/**
* The WebSocket transport uses the HTML5 WebSocket API to establish an
* persistent connection with the Socket.IO server. This transport will also
* be inherited by the FlashSocket fallback as it provides a API compatible
* polyfill for the WebSockets.
*
* @constructor
* @extends {io.Transport}
* @api public
*/
function WS (socket) {
io.Transport.apply(this, arguments);
};
/**
* Inherits from Transport.
*/
io.util.inherit(WS, io.Transport);
/**
* Transport name
*
* @api public
*/
WS.prototype.name = 'websocket';
/**
* Initializes a new `WebSocket` connection with the Socket.IO server. We attach
* all the appropriate listeners to handle the responses from the server.
*
* @returns {Transport}
* @api public
*/
WS.prototype.open = function () {
var query = io.util.query(this.socket.options.query)
, self = this
, Socket
// if node
Socket = require('ws');
// end node
if (!Socket) {
Socket = global.MozWebSocket || global.WebSocket;
}
this.websocket = new Socket(this.prepareUrl() + query);
this.websocket.onopen = function () {
self.onOpen();
self.socket.setBuffer(false);
};
this.websocket.onmessage = function (ev) {
self.onData(ev.data);
};
this.websocket.onclose = function () {
self.onClose();
self.socket.setBuffer(true);
};
this.websocket.onerror = function (e) {
self.onError(e);
};
return this;
};
/**
* Send a message to the Socket.IO server. The message will automatically be
* encoded in the correct message format.
*
* @returns {Transport}
* @api public
*/
// Do to a bug in the current IDevices browser, we need to wrap the send in a
// setTimeout, when they resume from sleeping the browser will crash if
// we don't allow the browser time to detect the socket has been closed
if (io.util.ua.iDevice) {
WS.prototype.send = function (data) {
var self = this;
setTimeout(function() {
self.websocket.send(data);
},0);
return this;
};
} else {
WS.prototype.send = function (data) {
this.websocket.send(data);
return this;
};
}
/**
* Payload
*
* @api private
*/
WS.prototype.payload = function (arr) {
for (var i = 0, l = arr.length; i < l; i++) {
this.packet(arr[i]);
}
return this;
};
/**
* Disconnect the established `WebSocket` connection.
*
* @returns {Transport}
* @api public
*/
WS.prototype.close = function () {
this.websocket.close();
return this;
};
/**
* Handle the errors that `WebSocket` might be giving when we
* are attempting to connect or send messages.
*
* @param {Error} e The error.
* @api private
*/
WS.prototype.onError = function (e) {
this.socket.onError(e);
};
/**
* Returns the appropriate scheme for the URI generation.
*
* @api private
*/
WS.prototype.scheme = function () {
return this.socket.options.secure ? 'wss' : 'ws';
};
/**
* Checks if the browser has support for native `WebSockets` and that
* it's not the polyfill created for the FlashSocket transport.
*
* @return {Boolean}
* @api public
*/
WS.check = function () {
// if node
return true;
// end node
return ('WebSocket' in global && !('__addTask' in WebSocket))
|| 'MozWebSocket' in global;
};
/**
* Check if the `WebSocket` transport support cross domain communications.
*
* @returns {Boolean}
* @api public
*/
WS.xdomainCheck = function () {
return true;
};
/**
* Add the transport to your public io.transports array.
*
* @api private
*/
io.transports.push('websocket');
})(
'undefined' != typeof io ? io.Transport : module.exports
, 'undefined' != typeof io ? io : module.parent.exports
, this
);
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