Feature/outbond ip

config/engine.example.toml

@@ -1,6 +1,6 @@
 [engine]
-# the network interface to bind
-interface = "eth0"
+# the network interface to bind, e.g.: 'eth0'
+interface = ""
 # the IP address to bind, empty allows the engine to get it from interface
 address = ""
 log-level = 10

engine/engine.go

@@ -82,11 +82,7 @@ func (engine *Engine) Loop() {
 	}
 }
 
-func getIPFromInterface(iname string, addr string) (string, error) {
-	if addr != "" {
-		return addr, nil
-	}
-
+func getSpecificIPFromInterface(iname string) (string, error) {
 	ifaces, err := net.Interfaces()
 	if err != nil {
 		return "", err
@@ -112,6 +108,23 @@ func getIPFromInterface(iname string, addr string) (string, error) {
 	return "", fmt.Errorf("no address for interface %s", iname)
 }
 
+func getIPFromInterface(iname string, addr string) (string, error) {
+	if addr != "" {
+		return addr, nil
+	}
+	if iname != "" {
+		return getSpecificIPFromInterface(iname)
+	}
+
+	conn, err := net.Dial("udp", "8.8.8.8:80")
+	if err != nil {
+		return "", err
+	}
+	defer conn.Close()
+	localAddr := conn.LocalAddr().(*net.UDPAddr)
+	return localAddr.IP.String(), nil
+}
+
 type pmap struct {
 	sync.RWMutex
 	id string

engine/peer.go

@@ -49,10 +49,7 @@ type Peer struct {
 }
 
 func BuildPeer(rid, uid string, pc *webrtc.PeerConnection, callback string) *Peer {
-	cid, err := uuid.NewV4()
-	if err != nil {
-		panic(err)
-	}
+	cid := uuid.Must(uuid.NewV4())
 	peer := &Peer{rid: rid, uid: uid, cid: cid.String(), pc: pc}
 	peer.callback = callback
 	peer.connected = make(chan bool, 1)

engine/router.go

@@ -324,8 +324,7 @@ func (r *Router) subscribe(rid, uid, cid string) (*webrtc.SessionDescription, er
 			ec <- buildError(ErrorServerSetLocalOffer, err)
 			return
 		}
-		c := <-gatherComplete
-		gc <- c
+		gc <- (<-gatherComplete)
 	}()
 
 	select {