/**
* The list of channel connection error.
* - The errors that would occur are:
* @attribute SOCKET_ERROR
* @type JSON
* @param {Number} CONNECTION_FAILED The connection failed. Up to user's
* defined reconnection attempts to decide on a reconnection.
* @param {String} RECONNECTION_FAILED The reconnection failed. Up to user's
* defined reconnection attempts to decide on another reconnection.
* @param {String} CONNECTION_ABORTED No reconnection specified.
* Connection is aborted.
* @param {String} RECONNECTION_ABORTED All reconnection attempts have failed.
* Reconnection is aborted.
* @param {String} RECONNECTION_ATTEMPT A reconnection attempt has been fired.
* @readOnly
* @component Socket
* @for Skylink
* @since 0.5.6
*/
Skylink.prototype.SOCKET_ERROR = {
CONNECTION_FAILED: 0,
RECONNECTION_FAILED: -1,
CONNECTION_ABORTED: -2,
RECONNECTION_ABORTED: -3,
RECONNECTION_ATTEMPT: -4
};
/**
* The queue of messages to be sent to signaling server.
* @attribute _socketMessageQueue
* @type Array
* @private
* @required
* @component Socket
* @for Skylink
* @since 0.5.8
*/
Skylink.prototype._socketMessageQueue = [];
/**
* The timeout used to send socket message queue.
* @attribute _socketMessageTimeout
* @type Function
* @private
* @required
* @component Socket
* @for Skylink
* @since 0.5.8
*/
Skylink.prototype._socketMessageTimeout = null;
/**
* The list of ports that SkylinkJS would use to attempt to connect to the signaling server with.
* @attribute _socketPorts
* @type JSON
* @param {Array} http:// The list of HTTP ports.
* @param {Array} https:// The list of HTTPs ports.
* @private
* @required
* @component Socket
* @for Skylink
* @since 0.5.8
*/
Skylink.prototype._socketPorts = {
'http:': [80, 3000],
'https:': [443, 3443]
};
/**
* The list of channel connection fallback states.
* - The fallback states that would occur are:
* @attribute SOCKET_FALLBACK
* @type JSON
* @param {String} NON_FALLBACK Non-fallback state,
* @param {String} FALLBACK_PORT Fallback to non-ssl port for channel re-try.
* @param {String} FALLBACK_PORT_SSL Fallback to ssl port for channel re-try.
* @param {String} LONG_POLLING Fallback to non-ssl long-polling.
* @param {String} LONG_POLLING_SSL Fallback to ssl port for long-polling.
* @readOnly
* @component Socket
* @for Skylink
* @since 0.5.6
*/
Skylink.prototype.SOCKET_FALLBACK = {
NON_FALLBACK: 'nonfallback',
FALLBACK_PORT: 'fallbackPortNonSSL',
FALLBACK_SSL_PORT: 'fallbackPortSSL',
LONG_POLLING: 'fallbackLongPollingNonSSL',
LONG_POLLING_SSL: 'fallbackLongPollingSSL'
};
/**
* The current socket opened state.
* @attribute _channelOpen
* @type Boolean
* @private
* @required
* @component Socket
* @for Skylink
* @since 0.5.2
*/
Skylink.prototype._channelOpen = false;
/**
* The signaling server to connect to.
* @attribute _signalingServer
* @type String
* @private
* @component Socket
* @for Skylink
* @since 0.5.2
*/
Skylink.prototype._signalingServer = null;
/**
* The signaling server protocol to use.
* <ul>
* <li><code>https:</code>
* <ul><li>Default port is <code>443</code>.</li>
* <li>Fallback port is <code>3443</code>.</li>
* </ul></li>
* <li><code>http:</code>
* <ul><li>Default port is <code>80</code>.</li>
* <li>Fallback port is <code>3000</code>.</li>
* </ul></li>
* </ul>
* @attribute _signalingServerProtocol
* @type String
* @private
* @component Socket
* @for Skylink
* @since 0.5.4
*/
Skylink.prototype._signalingServerProtocol = window.location.protocol;
/**
* The signaling server port to connect to.
* @attribute _signalingServerPort
* @type Number
* @private
* @component Socket
* @for Skylink
* @since 0.5.4
*/
Skylink.prototype._signalingServerPort = null;
/**
* The actual socket object that handles the connection.
* @attribute _socket
* @type Object
* @required
* @private
* @component Socket
* @for Skylink
* @since 0.1.0
*/
Skylink.prototype._socket = null;
/**
* The socket connection timeout
* <ul>
* <li><code>0</code> Uses the default timeout from socket.io
* <code>20000</code>ms.</li>
* <li><code>>0</code> Uses the user set timeout</li>
* </ul>
* @attribute _socketTimeout
* @type Number
* @default 0
* @required
* @private
* @component Socket
* @for Skylink
* @since 0.5.4
*/
Skylink.prototype._socketTimeout = 0;
/**
* The socket connection to use XDomainRequest.
* @attribute _socketUseXDR
* @type Boolean
* @default false
* @required
* @component Socket
* @private
* @for Skylink
* @since 0.5.4
*/
Skylink.prototype._socketUseXDR = false;
/**
* Sends a message to the signaling server.
* - Not to be confused with method
* {{#crossLink "Skylink/sendMessage:method"}}sendMessage(){{/crossLink}}
* that broadcasts messages. This is for sending socket messages.
* @method _sendChannelMessage
* @param {JSON} message
* @private
* @component Socket
* @for Skylink
* @since 0.5.8
*/
Skylink.prototype._sendChannelMessage = function(message) {
var self = this;
var interval = 1000;
var throughput = 16;
if (!self._channelOpen) {
return;
}
var messageString = JSON.stringify(message);
var sendLater = function(){
if (self._socketMessageQueue.length > 0){
if (self._socketMessageQueue.length<throughput){
log.debug([(message.target ? message.target : 'server'), null, null,
'Sending delayed message' + ((!message.target) ? 's' : '') + ' ->'], {
type: self._SIG_MESSAGE_TYPE.GROUP,
lists: self._socketMessageQueue.slice(0,self._socketMessageQueue.length),
mid: self._user.sid,
rid: self._room.id
});
self._socket.send({
type: self._SIG_MESSAGE_TYPE.GROUP,
lists: self._socketMessageQueue.splice(0,self._socketMessageQueue.length),
mid: self._user.sid,
rid: self._room.id
});
clearTimeout(self._socketMessageTimeout);
self._socketMessageTimeout = null;
}
else{
log.debug([(message.target ? message.target : 'server'), null, null,
'Sending delayed message' + ((!message.target) ? 's' : '') + ' ->'], {
type: self._SIG_MESSAGE_TYPE.GROUP,
lists: self._socketMessageQueue.slice(0,throughput),
mid: self._user.sid,
rid: self._room.id
});
self._socket.send({
type: self._SIG_MESSAGE_TYPE.GROUP,
lists: self._socketMessageQueue.splice(0,throughput),
mid: self._user.sid,
rid: self._room.id
});
clearTimeout(self._socketMessageTimeout);
self._socketMessageTimeout = null;
self._socketMessageTimeout = setTimeout(sendLater,interval);
}
self._timestamp.now = Date.now() || function() { return +new Date(); };
}
};
//Delay when messages are sent too rapidly
if ((Date.now() || function() { return +new Date(); }) - self._timestamp.now < interval &&
self._groupMessageList.indexOf(message.type) > -1) {
log.warn([(message.target ? message.target : 'server'), null, null,
'Messages fired too rapidly. Delaying.'], {
interval: 1000,
throughput: 16,
message: message
});
self._socketMessageQueue.push(messageString);
if (!self._socketMessageTimeout){
self._socketMessageTimeout = setTimeout(sendLater,
interval - ((Date.now() || function() { return +new Date(); })-self._timestamp.now));
}
return;
}
log.debug([(message.target ? message.target : 'server'), null, null,
'Sending to peer' + ((!message.target) ? 's' : '') + ' ->'], message);
//Normal case when messages are sent not so rapidly
self._socket.send(messageString);
self._timestamp.now = Date.now() || function() { return +new Date(); };
};
/**
* Create the socket object to refresh connection.
* @method _createSocket
* @param {String} type The type of socket.io connection to use.
* <ul>
* <li><code>"WebSocket"</code>: Uses the WebSocket connection</li>
* <li><code>"Polling"</code>: Uses the long-polling connection</li>
* </ul>
* @private
* @component Socket
* @for Skylink
* @since 0.5.10
*/
Skylink.prototype._createSocket = function (type) {
var self = this;
var options = {
forceNew: true,
//'sync disconnect on unload' : true,
reconnection: false
};
var ports = self._socketPorts[self._signalingServerProtocol];
var connectionType = null;
// just beginning
if (self._signalingServerPort === null) {
self._signalingServerPort = ports[0];
connectionType = self.SOCKET_FALLBACK.NON_FALLBACK;
// reached the end of the last port for the protocol type
} else if ( ports.indexOf(self._signalingServerPort) === ports.length - 1 ) {
// re-refresh to long-polling port
if (type === 'WebSocket') {
console.log(type, self._signalingServerPort);
type = 'Polling';
self._signalingServerPort = ports[0];
} else if (type === 'Polling') {
options.reconnection = true;
options.reconnectionAttempts = 4;
options.reconectionDelayMax = 1000;
}
// move to the next port
} else {
self._signalingServerPort = ports[ ports.indexOf(self._signalingServerPort) + 1 ];
}
var url = self._signalingServerProtocol + '//' +
self._signalingServer + ':' + self._signalingServerPort;
if (type === 'WebSocket') {
options.transports = ['websocket'];
} else if (type === 'Polling') {
options.transports = ['xhr-polling', 'jsonp-polling', 'polling'];
}
// if socket instance already exists, exit
if (self._socket) {
self._socket.removeAllListeners('connect_error');
self._socket.removeAllListeners('reconnect_attempt');
self._socket.removeAllListeners('reconnect_error');
self._socket.removeAllListeners('reconnect_failed');
self._socket.removeAllListeners('connect');
self._socket.removeAllListeners('reconnect');
self._socket.removeAllListeners('error');
self._socket.removeAllListeners('disconnect');
self._socket.removeAllListeners('message');
self._socket.disconnect();
self._socket = null;
}
self._channelOpen = false;
log.log('Opening channel with signaling server url:', {
url: url,
useXDR: self._socketUseXDR,
options: options
});
self._socket = io.connect(url, options);
if (connectionType === null) {
connectionType = self._signalingServerProtocol === 'http:' ?
(type === 'Polling' ? self.SOCKET_FALLBACK.LONG_POLLING :
self.SOCKET_FALLBACK.FALLBACK_PORT) :
(type === 'Polling' ? self.SOCKET_FALLBACK.LONG_POLLING_SSL :
self.SOCKET_FALLBACK.FALLBACK_SSL_PORT);
}
self._socket.on('connect_error', function (error) {
self._channelOpen = false;
self._trigger('socketError', self.SOCKET_ERROR.CONNECTION_FAILED,
error, connectionType);
self._trigger('channelRetry', connectionType, 1);
if (options.reconnection === false) {
self._createSocket(type);
}
});
self._socket.on('reconnect_attempt', function (attempt) {
self._channelOpen = false;
self._trigger('socketError', self.SOCKET_ERROR.RECONNECTION_ATTEMPT,
attempt, connectionType);
self._trigger('channelRetry', connectionType, attempt);
});
self._socket.on('reconnect_error', function (error) {
self._channelOpen = false;
self._trigger('socketError', self.SOCKET_ERROR.RECONNECTION_FAILED,
error, connectionType);
});
self._socket.on('reconnect_failed', function (error) {
self._channelOpen = false;
self._trigger('socketError', self.SOCKET_ERROR.RECONNECTION_ABORTED,
error, connectionType);
});
self._socket.on('connect', function () {
if (!self._channelOpen) {
self._channelOpen = true;
self._trigger('channelOpen');
log.log([null, 'Socket', null, 'Channel opened']);
}
});
self._socket.on('reconnect', function () {
if (!self._channelOpen) {
self._channelOpen = true;
self._trigger('channelOpen');
log.log([null, 'Socket', null, 'Channel opened']);
}
});
self._socket.on('error', function(error) {
self._channelOpen = false;
self._trigger('channelError', error);
log.error([null, 'Socket', null, 'Exception occurred:'], error);
});
self._socket.on('disconnect', function() {
self._channelOpen = false;
self._trigger('channelClose');
log.log([null, 'Socket', null, 'Channel closed']);
});
self._socket.on('message', function(message) {
log.log([null, 'Socket', null, 'Received message']);
self._processSigMessage(message);
});
};
/**
* Initiate a socket signaling connection.
* @method _openChannel
* @trigger channelMessage, channelOpen, channelError, channelClose
* @private
* @component Socket
* @for Skylink
* @since 0.5.5
*/
Skylink.prototype._openChannel = function() {
var self = this;
if (self._channelOpen) {
log.error([null, 'Socket', null, 'Unable to instantiate a new channel connection ' +
'as there is already an ongoing channel connection']);
return;
}
if (self._readyState !== self.READY_STATE_CHANGE.COMPLETED) {
log.error([null, 'Socket', null, 'Unable to instantiate a new channel connection ' +
'as readyState is not ready']);
return;
}
// set if forceSSL
if (self._forceSSL) {
self._signalingServerProtocol = 'https:';
} else {
self._signalingServerProtocol = window.location.protocol;
}
// Begin with a websocket connection
self._createSocket('WebSocket');
};
/**
* Closes the socket signaling connection.
* @method _closeChannel
* @private
* @component Socket
* @for Skylink
* @since 0.5.5
*/
Skylink.prototype._closeChannel = function() {
if (!this._channelOpen) {
return;
}
if (this._socket) {
this._socket.removeAllListeners('connect_error');
this._socket.removeAllListeners('reconnect_attempt');
this._socket.removeAllListeners('reconnect_error');
this._socket.removeAllListeners('reconnect_failed');
this._socket.removeAllListeners('connect');
this._socket.removeAllListeners('reconnect');
this._socket.removeAllListeners('error');
this._socket.removeAllListeners('disconnect');
this._socket.removeAllListeners('message');
this._socket.disconnect();
this._socket = null;
}
this._channelOpen = false;
this._trigger('channelClose');
};