snapshot of https://github.com/pion/webrtc.git (main, 2026-09-15; blobs > 131072B omitted)

examples/ice-single-port/main.go

@@ -0,0 +1,104 @@
+// SPDX-FileCopyrightText: 2026 The Pion community <https://pion.ly>
+// SPDX-License-Identifier: MIT
+
+//go:build !js
+
+// ice-single-port demonstrates Pion WebRTC's ability to serve many PeerConnections on a single port.
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"time"
+
+	"github.com/pion/ice/v4"
+	"github.com/pion/webrtc/v4"
+)
+
+var api *webrtc.API //nolint
+
+// Everything below is the Pion WebRTC API! Thanks for using it ❤️.
+func doSignaling(res http.ResponseWriter, req *http.Request) {
+	peerConnection, err := api.NewPeerConnection(webrtc.Configuration{})
+	if err != nil {
+		panic(err)
+	}
+
+	// Set the handler for ICE connection state
+	// This will notify you when the peer has connected/disconnected
+	peerConnection.OnICEConnectionStateChange(func(connectionState webrtc.ICEConnectionState) {
+		fmt.Printf("ICE Connection State has changed: %s\n", connectionState.String())
+	})
+
+	// Send the current time via a DataChannel to the remote peer every 3 seconds
+	peerConnection.OnDataChannel(func(d *webrtc.DataChannel) {
+		d.OnOpen(func() {
+			for range time.Tick(time.Second * 3) {
+				if err = d.SendText(time.Now().String()); err != nil {
+					panic(err)
+				}
+			}
+		})
+	})
+
+	var offer webrtc.SessionDescription
+	if err = json.NewDecoder(req.Body).Decode(&offer); err != nil {
+		panic(err)
+	}
+
+	if err = peerConnection.SetRemoteDescription(offer); err != nil {
+		panic(err)
+	}
+
+	// Create channel that is blocked until ICE Gathering is complete
+	gatherComplete := webrtc.GatheringCompletePromise(peerConnection)
+
+	answer, err := peerConnection.CreateAnswer(nil)
+	if err != nil {
+		panic(err)
+	} else if err = peerConnection.SetLocalDescription(answer); err != nil {
+		panic(err)
+	}
+
+	// Block until ICE Gathering is complete, disabling trickle ICE
+	// we do this because we only can exchange one signaling message
+	// in a production application you should exchange ICE Candidates via OnICECandidate
+	<-gatherComplete
+
+	response, err := json.Marshal(*peerConnection.LocalDescription())
+	if err != nil {
+		panic(err)
+	}
+
+	res.Header().Set("Content-Type", "application/json")
+	if _, err := res.Write(response); err != nil {
+		panic(err)
+	}
+}
+
+func main() {
+	// Create a SettingEngine, this allows non-standard WebRTC behavior
+	settingEngine := webrtc.SettingEngine{}
+
+	// Configure our SettingEngine to use our UDPMux. By default a PeerConnection has
+	// no global state. The API+SettingEngine allows the user to share state between them.
+	// In this case we are sharing our listening port across many.
+	// Listen on UDP Port 8443, will be used for all WebRTC traffic
+	mux, err := ice.NewMultiUDPMuxFromPort(8443)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Printf("Listening for WebRTC traffic at %d\n", 8443)
+	settingEngine.SetICEUDPMux(mux)
+
+	// Create a new API using our SettingEngine
+	api = webrtc.NewAPI(webrtc.WithSettingEngine(settingEngine))
+
+	http.Handle("/", http.FileServer(http.Dir(".")))
+	http.HandleFunc("/doSignaling", doSignaling)
+
+	fmt.Println("Open http://localhost:8080 to access this demo")
+	// nolint: gosec
+	panic(http.ListenAndServe(":8080", nil))
+}