mirror of
https://github.com/pion/webrtc.git
synced 2025-10-05 15:16:52 +08:00
125 lines
3.3 KiB
Go
125 lines
3.3 KiB
Go
package main
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import (
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"bufio"
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"encoding/base64"
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"fmt"
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"math/rand"
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"os"
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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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// 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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// Create a datachannel with label 'data'
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dataChannel, err := peerConnection.CreateDataChannel("data", nil)
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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("Connection State has changed %s \n", connectionState.String())
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// TODO: find the correct place for this
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if connectionState == ice.ConnectionStateConnected {
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fmt.Println("sending openchannel")
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err := dataChannel.SendOpenChannelMessage()
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if err != nil {
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fmt.Println("faild to send openchannel", err)
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}
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}
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}
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// Register the Onmessage to handle incoming messages
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dataChannel.Lock()
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dataChannel.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(), dataChannel.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(), dataChannel.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(), dataChannel.Label)
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}
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}
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dataChannel.Unlock()
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// Create an offer to send to the browser
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offer, err := peerConnection.CreateOffer(nil)
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check(err)
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// Output the offer in base64 so we can paste it in browser
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fmt.Println(base64.StdEncoding.EncodeToString([]byte(offer.Sdp)))
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// Wait for the offer to be pasted
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sd := mustReadStdin()
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// Set the remote SessionDescription
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answer := webrtc.RTCSessionDescription{
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Type: webrtc.RTCSdpTypeAnswer,
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Sdp: sd,
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}
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// Apply the answer as the remote description
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err = peerConnection.SetRemoteDescription(answer)
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check(err)
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// Send messages every 5 seconds
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fmt.Println("Random messages will now be sent to any connected DataChannels every 5 seconds")
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for {
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time.Sleep(5 * time.Second)
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message := randSeq(15)
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fmt.Printf("Sending %s \n", message)
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err := dataChannel.Send(datachannel.PayloadString{Data: []byte(message)})
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check(err)
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}
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}
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// randSeq is used to generate a random message
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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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// mustReadStdin blocks untill input is received from stdin
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func mustReadStdin() string {
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reader := bufio.NewReader(os.Stdin)
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rawSd, err := reader.ReadString('\n')
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check(err)
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fmt.Println("")
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sd, err := base64.StdEncoding.DecodeString(rawSd)
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check(err)
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return string(sd)
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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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