Can detect if a call was rejected

assets/3rdparty/SignalExchangerClient/SignalExchangerClient.js

@@ -0,0 +1,261 @@
+/**
+ * Signal exchanger web client
+ * 
+ * @author Pierre HUBERT
+ */
+
+class SignalExchangerClient {
+
+    /**
+     * Server domain
+     * 
+     * @type {String}
+     */
+    //domain;
+
+    /**
+     * Server port
+     * 
+     * @type {Number}
+     */
+    //port;
+
+    /**
+     * Current client ID
+     * 
+     * @type {String}
+     */
+    //clientID;
+    
+    /**
+     * Socket connection to the server
+     * 
+     * @type {WebSocket}
+     */
+    //socket;
+
+    /**
+     * Function called in case of error
+     * 
+     * @type {Function}
+     */
+    //onError = null;
+
+    /**
+     * Function called when the connection is etablished
+     * 
+     * @type {Function}
+     */
+    //onConnected = null;
+
+    /**
+     * Function called when the connection to the socket is closed
+     * 
+     * @type {Function}
+     */
+    //onClosed = null;
+
+    /**
+     * Function called when we get a new signal information
+     * 
+     * @type {Function}
+     */
+    //onSignal = null;
+
+    /**
+     * Function called when we get a ready message notice
+     * 
+     * @type {Function}
+     */
+    //onReadyMessage = null;
+
+    /**
+     * Construct a client instance
+     * 
+     * @param {String} domain The name of the signal server
+     * @param {Number} port The port of the server to use
+     * @param {String} clientID The ID of current client
+     */
+    constructor(domain, port, clientID) {
+        
+        //Save information
+        this.domain = domain,
+        this.port = port;
+        this.clientID = clientID;
+
+        this.socket = new WebSocket("ws://" + this.domain + ":" + this.port + "/socket");
+
+        //Add a few events listeners
+        this.socket.addEventListener("open", () => {
+            this.serverConnected();
+
+            if(this.onConnected != null)
+                setTimeout(this.onConnected, 10);
+        });
+
+        this.socket.addEventListener("message", message => {
+
+            let data;
+            try {
+                data = JSON.parse(message.data);
+            } catch(e){
+                console.error("Could not parse message from server!");
+                return;
+            }
+
+            console.log("New message from socket", data);
+
+            this.serverMessage(data);
+        });
+
+        this.socket.addEventListener("error", () => {
+            if(this.onError != null)
+                setTimeout(this.onError, 0);
+        });
+
+        this.socket.addEventListener("close", () => {
+            if(this.onClosed != null)
+                setTimeout(this.onClosed, 0);   
+        });
+    }
+
+    /**
+     * Use this method to get the current connection status to the server
+     * 
+     * @return {Boolean} TRUE if the client is connected to the server / FALSE else
+     */
+    isConnected() {
+        return this.socket.readyState == WebSocket.OPEN;
+    }
+
+    /**
+     * Close the connection to the server (if connected)
+     */
+    close() {
+        if(this.isConnected())
+            this.socket.close();
+    }
+
+    /**
+     * Method called once the client is successfully
+     * connected to the client
+     */
+    serverConnected(){
+        
+        //Send data to the server to identificate client
+        this.sendData({
+            client_id: this.clientID
+        });
+
+    }
+
+    /**
+     * Send ready message to a peer
+     * 
+     * @param {String} peerID The ID of the target peer for the message
+     */
+    sendReadyMessage(peerID){
+
+        this.sendData({
+            ready_msg: true,
+            target_id: peerID
+        });
+
+    }
+
+    /**
+     * Send a signal to the server
+     * 
+     * @param target_id The ID of the target for the signal
+     * @param content Signal to send to the target
+     */
+    sendSignal(target_id, content){
+        
+        //Send directly the message to the server
+        this.sendData({
+            signal: content,
+            target_id: target_id
+        });
+
+        //Save the current signal being sent to be able to send
+        //it again in case of failure
+        this.pending_signal = content;
+        this.pending_signal_target = target_id;
+    }
+
+    /**
+     * Stop to try to send the current signal message in queue
+     * 
+     * This does not cancel the sending of messages already sent through
+     * socket
+     */
+    cancelCurrentSignal() {
+        this.pending_signal = undefined;
+        this.pending_signal_target = undefined;
+    }
+
+    /**
+     * Send data to the server
+     * 
+     * @param {Object} data The data to send to the server
+     */
+    sendData(data){
+        console.log("Sending data to server", data);
+        this.socket.send(JSON.stringify(data));
+    }
+
+    /**
+     * This method is called when the server has sent a new message to this client
+     * 
+     * @param {Object} message The message sent by the server, as a JSON object
+     */
+    serverMessage(message){
+
+        //Check if it is a callback for a pending message
+        if(message.signal_sent){
+            if(message.number_of_targets < 1 && this.pending_signal && this.pending_signal_target){
+
+                //We have to send the message again
+                setTimeout(() => {
+                    this.sendSignal(this.pending_signal, this.pending_signal_target);
+                }, 1000);
+
+            }
+
+            else {
+
+                //Else we can remove from this class information about the signal being sent
+                this.cancelCurrentSignal();
+
+            }
+        }
+
+        //Check if message is a callback for a ready notice
+        else if(message.ready_message_sent){
+
+            if(message.number_of_targets < 1){
+
+                //Try to send message again
+                setTimeout(() => {
+                    this.sendReadyMessage(message.target_id);
+                }, 1000);
+
+            }
+
+        }
+
+        // Check if message is a ready notice
+        else if(message.ready_msg){
+            if(this.onReadyMessage != null)
+                this.onReadyMessage(message.source_id);
+        }
+
+        // Check if the message is a signal
+        else if(message.signal){
+            if(this.onSignal != null)
+                this.onSignal(message.signal, message.source_id);
+        }
+
+
+    }
+}