archive

comms/webRTC-over-websockets/js/signaling.js

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+var signaling = function(options){
+	
+	var socket = new WebSocket(options.webSocketAddress);	
+	var logg = function(s) { console.log(s); };
+
+	var myId = options.id;
+
+	var that = {};
+    var callbacks = {};
+
+    function getCallback(type){
+        return callbacks[type] !== undefined ? callbacks[type] : function(){
+            console.log("Callback of type " + type + " not found");
+        };
+    }
+
+    that.addCallback = function(type, f){
+        callbacks[type] = f;
+    }    
+
+	that.sendMessage = function(message, to) {
+        sendMsg(message, to);
+    }
+
+	that.sendPresence = function(_name, stat){
+		_status = stat || 'on';
+		myId = _name;
+        sendMsg({type: 'presence', name: _name, status: _status});
+    }
+
+    that.joinRoom = function(room){
+        sendMsg({type: 'room'}, room);
+    }
+
+	that.callOtherParty = function(to){
+		sendMsg({type: 's-offer'}, to);
+	};
+
+	that.answer = function(to, _answer){
+		sendMsg({type: 's-answer', answer: _answer}, to);
+	};
+
+    function sendMsg(message, to){
+    	message.from = myId;
+        if(to !== undefined)  
+            message.to = to;  
+        var mymsg = JSON.stringify(message);
+        logg("SOCKET Send: " + mymsg);
+        socket.send(mymsg);
+    }
+
+	socket.addEventListener("message", onMessage, false);
+
+    socket.addEventListener("error", function(event) {
+        logg("SOCKET Error: " + event);
+    });
+ 
+    socket.addEventListener("close", function(event) {
+        logg("SOCKET Close: " + event);
+    });
+
+    function onMessage(evt) {
+        logg("RECEIVED: " + evt.data);
+        processSignalingMessage(evt.data);
+    }
+
+    //message comes as a JSON from the websocket server
+    function processSignalingMessage(message) {
+        var msg = JSON.parse(message);
+        logg("processSignalingMessage type(" + msg.type + ")= " + message);
+        getCallback(msg.type)(msg);
+    }
+
+    return that;
+
+}