Host/Guest with signal filtering.

client/index.html

@@ -11,6 +11,7 @@
 
         <br />
 
-        <button id="start">Start Video</button>
+        <button id="host">Host</button>
+        <button id="connect">Connect</button>
     </body>
 </html>

client/peer-exchange.js

@@ -1,19 +1,10 @@
-import { createUUID } from './random.js';
-
 export async function createPeerExchange(address) {
-    const uuid = createUUID();
-
     const server = new WebSocket(address);
     const listeners = new Set();
 
     function onMessage(message) {
         const data = JSON.parse(message.data);
-
-        if (data.uuid === uuid) {
-            return;
-        }
-
-        listeners.forEach(callback => callback(data, send));
+        listeners.forEach(callback => callback(data));
     }
 
     function listen(callback) {
@@ -21,7 +12,7 @@ export async function createPeerExchange(address) {
     }
 
     function send(data) {
-        server.send(JSON.stringify(Object.assign({uuid}, data)));
+        server.send(JSON.stringify(data));
     }
 
     server.addEventListener('message', onMessage);

client/peer.js

@@ -1,33 +1,46 @@
+import { createUUID } from './random.js';
+
 function errorHandler(error) {
     console.log(error);
 }
 
+function filter(uuid) {
+    return function filterSignal(callback) {
+        return function(signal) {
+            if (signal.uuid === uuid) {
+                console.log(`${uuid} ours, filtering`);
+                return;
+            }
+            callback(signal);
+        }
+    }
+}
+
 export function createHost(peerExchange, peerConnectionConfig) {
     const listeners = new Set();
 
     function onConnection(callback) {
-        listeners.push(callback);
+        listeners.add(callback);
     }
 
     function emitConnection(conn) {
         listeners.forEach(callback => callback(conn));
     }
 
-    function handleSDP(sdp) {
-        host.setRemoteDescription(new RTCSessionDescription(signal.sdp));
-    }
-
-    peerExchange.listen(async (signal, send) => {
+    peerExchange.listen(async signal => {
+        console.log("Host signal", signal);
         if (signal.sdp && signal.sdp.type === "offer") {
-            const host = createConn(peerExchange, peerConnectionConfig);
+            const {conn, send} = createConn(peerExchange, peerConnectionConfig);
 
             const remoteDesc = new RTCSessionDescription(signal.sdp);
-            await host.setRemoteDescription(remoteDesc);
+            await conn.setRemoteDescription(remoteDesc);
 
             const localDesc = await conn.createAnswer();
-            await host.setLocalDescription(localDesc);
+            await conn.setLocalDescription(localDesc);
 
-            send({'sdp': desc});
+            send({sdp: localDesc});
+
+            emitConnection(conn);
         }
     });
 
@@ -36,22 +49,69 @@ export function createHost(peerExchange, peerConnectionConfig) {
     };
 }
 
-export function createConn(peerExchange, peerConnectionConfig) {
-    const conn = new RTCPeerConnection(peerConnectionConfig);
+export function createGuest(peerExchange, peerConnectionConfig) {
+    const {conn, onSignal, send} = createConn(peerExchange, peerConnectionConfig);
 
-    conn.addEventListener('icecandidate', event => {
-        if(event.candidate != null) {
-            peerExchange.send({ice: event.candidate});
+    onSignal(async signal => {
+        console.log("Guest signal", signal);
+        if (signal.sdp && signal.sdp.type === "answer") {
+            const remoteDesc = new RTCSessionDescription(signal.sdp);
+            await conn.setRemoteDescription(remoteDesc);
         }
     });
 
+    async function connect() {
+        const localDesc = await conn.createOffer();
+        await conn.setLocalDescription(localDesc);
+        send({sdp: localDesc});
+    }
+
+    return {
+        conn,
+        connect,
+    };
+}
+
+
+export function createConn(peerExchange, peerConnectionConfig) {
+    const conn = new RTCPeerConnection(peerConnectionConfig);
+    const uuid = createUUID();
+
+    conn.addEventListener('icecandidate', event => {
+        if(event.candidate != null) {
+            send({ice: event.candidate});
+        }
+    });
+
+    const listeners = new Set();
+
+    function onSignal(callback) {
+        listeners.add(callback);
+    }
+
     peerExchange.listen(signal => {
+        if (signal.uuid === uuid) {
+            return;
+        }
+
+        listeners.forEach(callback => callback(signal));
+    });
+
+    onSignal(signal => {
         if(signal.ice) {
             conn.addIceCandidate(new RTCIceCandidate(signal.ice)).catch(errorHandler);
         }
     });
 
-    return conn;
+    function send(data) {
+        peerExchange.send(Object.assign({}, data, {uuid}));
+    }
+
+    return {
+        conn,
+        onSignal,
+        send,
+    };
 }
 
 export function createPeer(peerExchange, peerConnectionConfig) {

client/webrtc.js

@@ -1,17 +1,46 @@
 import { dataChannelConfig, peerConnectionConfig } from './config.js';
 import { createPeerExchange } from './peer-exchange.js';
-import { createPeer } from './peer.js';
+import { createPeer, createHost, createGuest} from './peer.js';
 
 var peerConnection;
 var serverConnection;
 
 async function pageReady() {
-    document.querySelector("button#start")
-    .addEventListener("click", extendOffer);
+    document.querySelector("button#host")
+    .addEventListener("click", host);
+
+    document.querySelector("button#connect")
+    .addEventListener("click", connect);
 
     serverConnection = await createPeerExchange('wss://' + window.location.hostname + ':8443');
+}
 
-    setup();
+function host() {
+    const host = createHost(serverConnection, peerConnectionConfig);
+    host.onConnection(conn => {
+        console.log("Host Received Connection", conn);
+
+        conn.addEventListener('addstream', stream => {
+            console.log("Host received stream", stream);
+            document.getElementById('remoteVideo').srcObject = event.stream;
+        });
+    });
+    console.log("Host waiting for connections");
+}
+
+async function connect() {
+    var constraints = {
+        video: true,
+        audio: true,
+    };
+
+    const stream = await navigator.mediaDevices.getUserMedia(constraints);
+
+    const guest = createGuest(serverConnection, peerConnectionConfig);
+    guest.conn.addStream(stream);
+
+    console.log("Connecting");
+    guest.connect();
 }
 
 async function setup() {