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//go:build !js
// +build !js
package main
import (
"encoding/json"
"fmt"
"net/http"
"time"
"github.com/pion/ice/v2"
"github.com/pion/webrtc/v3"
)
var api *webrtc.API //nolint
// Everything below is the Pion WebRTC API! Thanks for using it ❤️.
func doSignaling(w http.ResponseWriter, r *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(r.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)
}
w.Header().Set("Content-Type", "application/json")
if _, err := w.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")
panic(http.ListenAndServe(":8080", nil))
}
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