mirror of
https://github.com/pion/webrtc.git
synced 2025-11-03 09:40:59 +08:00
133 lines
3.4 KiB
Go
133 lines
3.4 KiB
Go
package main
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import (
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"encoding/json"
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"flag"
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"fmt"
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"math/rand"
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"net/http"
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"time"
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"github.com/pions/webrtc"
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"github.com/pions/webrtc/pkg/datachannel"
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"github.com/pions/webrtc/pkg/ice"
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)
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func main() {
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addr := flag.String("address", ":50000", "Address to host the HTTP server on.")
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flag.Parse()
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offerChan, answerChan := mustSignalViaHTTP(*addr)
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/* Everything below is the pion-WebRTC API, thanks for using it! */
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// Prepare the configuration
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config := webrtc.RTCConfiguration{
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IceServers: []webrtc.RTCIceServer{
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{
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URLs: []string{"stun:stun.l.google.com:19302"},
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},
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},
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}
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// Create a new RTCPeerConnection
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peerConnection, err := webrtc.New(config)
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check(err)
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// Set the handler for ICE connection state
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// This will notify you when the peer has connected/disconnected
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peerConnection.OnICEConnectionStateChange = func(connectionState ice.ConnectionState) {
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fmt.Printf("ICE Connection State has changed: %s\n", connectionState.String())
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}
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// Register data channel creation handling
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peerConnection.OnDataChannel = func(d *webrtc.RTCDataChannel) {
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fmt.Printf("New DataChannel %s %d\n", d.Label, d.ID)
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d.Lock()
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defer d.Unlock()
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// Register channel opening handling
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d.OnOpen = func() {
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fmt.Printf("Data channel '%s'-'%d' open. Random messages will now be sent to any connected DataChannels every 5 seconds\n", d.Label, d.ID)
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for range time.NewTicker(5 * time.Second).C {
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message := randSeq(15)
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fmt.Printf("Sending %s \n", message)
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err := d.Send(datachannel.PayloadString{Data: []byte(message)})
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check(err)
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}
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}
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// Register message handling
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d.Onmessage = func(payload datachannel.Payload) {
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switch p := payload.(type) {
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case *datachannel.PayloadString:
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fmt.Printf("Message '%s' from DataChannel '%s' payload '%s'\n", p.PayloadType().String(), d.Label, string(p.Data))
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case *datachannel.PayloadBinary:
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fmt.Printf("Message '%s' from DataChannel '%s' payload '% 02x'\n", p.PayloadType().String(), d.Label, p.Data)
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default:
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fmt.Printf("Message '%s' from DataChannel '%s' no payload \n", p.PayloadType().String(), d.Label)
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}
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}
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}
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// Wait for the remote SessionDescription
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offer := <-offerChan
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err = peerConnection.SetRemoteDescription(offer)
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check(err)
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// Sets the LocalDescription, and starts our UDP listeners
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answer, err := peerConnection.CreateAnswer(nil)
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check(err)
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// Send the answer
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answerChan <- answer
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// Block forever
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select {}
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}
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// mustSignalViaHTTP exchange the SDP offer and answer using an HTTP server.
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func mustSignalViaHTTP(address string) (offerOut chan webrtc.RTCSessionDescription, answerIn chan webrtc.RTCSessionDescription) {
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offerOut = make(chan webrtc.RTCSessionDescription)
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answerIn = make(chan webrtc.RTCSessionDescription)
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http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
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var offer webrtc.RTCSessionDescription
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err := json.NewDecoder(r.Body).Decode(&offer)
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check(err)
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offerOut <- offer
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answer := <-answerIn
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err = json.NewEncoder(w).Encode(answer)
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check(err)
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})
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go http.ListenAndServe(address, nil)
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fmt.Println("Listening on", address)
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return
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}
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func randSeq(n int) string {
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r := rand.New(rand.NewSource(time.Now().UnixNano()))
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letters := []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
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b := make([]rune, n)
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for i := range b {
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b[i] = letters[r.Intn(len(letters))]
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}
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return string(b)
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}
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// check is used to panic in an error occurs.
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func check(err error) {
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if err != nil {
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panic(err)
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}
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}
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