neko/server/internal/webrtc/webrtc.go

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package webrtc
import (
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"encoding/json"
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"errors"
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"fmt"
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"io"
"net"
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"strings"
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"time"
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"github.com/pion/ice/v2"
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"github.com/pion/interceptor"
"github.com/pion/webrtc/v3"
"github.com/pion/webrtc/v3/pkg/media"
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"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
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"m1k1o/neko/internal/config"
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"m1k1o/neko/internal/types"
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"m1k1o/neko/internal/webrtc/pionlog"
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)
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func New(sessions types.SessionManager, capture types.CaptureManager, desktop types.DesktopManager, config *config.WebRTC) *WebRTCManager {
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return &WebRTCManager{
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logger: log.With().Str("module", "webrtc").Logger(),
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capture: capture,
desktop: desktop,
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sessions: sessions,
config: config,
}
}
type WebRTCManager struct {
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logger zerolog.Logger
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videoTrack *webrtc.TrackLocalStaticSample
audioTrack *webrtc.TrackLocalStaticSample
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sessions types.SessionManager
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capture types.CaptureManager
desktop types.DesktopManager
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config *config.WebRTC
api *webrtc.API
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}
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func (manager *WebRTCManager) Start() {
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var err error
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//
// audio
//
audioCodec := manager.capture.Audio().Codec()
manager.audioTrack, err = webrtc.NewTrackLocalStaticSample(audioCodec.Capability, "audio", "stream")
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if err != nil {
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manager.logger.Panic().Err(err).Msg("unable to create audio track")
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}
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manager.capture.Audio().OnSample(func(sample types.Sample) {
err := manager.audioTrack.WriteSample(media.Sample(sample))
if err != nil && errors.Is(err, io.ErrClosedPipe) {
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manager.logger.Warn().Err(err).Msg("audio pipeline failed to write")
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}
})
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//
// video
//
videoCodec := manager.capture.Video().Codec()
manager.videoTrack, err = webrtc.NewTrackLocalStaticSample(videoCodec.Capability, "video", "stream")
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if err != nil {
manager.logger.Panic().Err(err).Msg("unable to create video track")
}
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manager.capture.Video().OnSample(func(sample types.Sample) {
err := manager.videoTrack.WriteSample(media.Sample(sample))
if err != nil && errors.Is(err, io.ErrClosedPipe) {
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manager.logger.Warn().Err(err).Msg("video pipeline failed to write")
}
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})
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//
// api
//
if err := manager.initAPI(); err != nil {
manager.logger.Panic().Err(err).Msg("failed to initialize webrtc API")
}
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manager.logger.Info().
Str("ice_lite", fmt.Sprintf("%t", manager.config.ICELite)).
Str("ice_servers", fmt.Sprintf("%+v", manager.config.ICEServers)).
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Str("ephemeral_port_range", fmt.Sprintf("%d-%d", manager.config.EphemeralMin, manager.config.EphemeralMax)).
Str("nat_ips", strings.Join(manager.config.NAT1To1IPs, ",")).
Msgf("webrtc starting")
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}
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func (manager *WebRTCManager) Shutdown() error {
manager.logger.Info().Msgf("webrtc shutting down")
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return nil
}
func (manager *WebRTCManager) initAPI() error {
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logger := pionlog.New(manager.logger)
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settings := webrtc.SettingEngine{
LoggerFactory: logger,
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}
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_ = settings.SetEphemeralUDPPortRange(manager.config.EphemeralMin, manager.config.EphemeralMax)
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settings.SetNAT1To1IPs(manager.config.NAT1To1IPs, webrtc.ICECandidateTypeHost)
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settings.SetICETimeouts(6*time.Second, 6*time.Second, 3*time.Second)
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settings.SetSRTPReplayProtectionWindow(512)
settings.SetLite(manager.config.ICELite)
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var networkType []webrtc.NetworkType
// Add TCP Mux
if manager.config.TCPMUX > 0 {
tcpListener, err := net.ListenTCP("tcp", &net.TCPAddr{
IP: net.IP{0, 0, 0, 0},
Port: manager.config.TCPMUX,
})
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if err != nil {
return err
}
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tcpMux := ice.NewTCPMuxDefault(ice.TCPMuxParams{
Listener: tcpListener,
Logger: logger.NewLogger("ice-tcp"),
ReadBufferSize: 32, // receiving channel size
WriteBufferSize: 4 * 1024 * 1024, // write buffer size, 4MB
})
settings.SetICETCPMux(tcpMux)
networkType = append(networkType, webrtc.NetworkTypeTCP4)
manager.logger.Info().Str("listener", tcpListener.Addr().String()).Msg("using TCP MUX")
}
// Add UDP Mux
if manager.config.UDPMUX > 0 {
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udpMux, err := ice.NewMultiUDPMuxFromPort(manager.config.UDPMUX,
ice.UDPMuxFromPortWithLogger(logger.NewLogger("ice-udp")),
)
if err != nil {
return err
}
settings.SetICEUDPMux(udpMux)
networkType = append(networkType, webrtc.NetworkTypeUDP4)
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manager.logger.Info().Int("port", manager.config.UDPMUX).Msg("using UDP MUX")
}
// Enable support for TCP and UDP ICE candidates
if len(networkType) > 0 {
settings.SetNetworkTypes(networkType)
}
// Create MediaEngine with selected codecs
engine := webrtc.MediaEngine{}
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manager.capture.Audio().Codec().Register(&engine)
manager.capture.Video().Codec().Register(&engine)
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// Register Interceptors
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i := &interceptor.Registry{}
if err := webrtc.RegisterDefaultInterceptors(&engine, i); err != nil {
return err
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}
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// Create API with MediaEngine and SettingEngine
manager.api = webrtc.NewAPI(
webrtc.WithMediaEngine(&engine),
webrtc.WithSettingEngine(settings),
webrtc.WithInterceptorRegistry(i),
)
return nil
}
func (manager *WebRTCManager) CreatePeer(id string, session types.Session) (types.Peer, error) {
configuration := webrtc.Configuration{
SDPSemantics: webrtc.SDPSemanticsUnifiedPlanWithFallback,
}
if !manager.config.ICELite {
configuration.ICEServers = manager.config.ICEServers
}
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// Create new peer connection
connection, err := manager.api.NewPeerConnection(configuration)
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if err != nil {
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return nil, err
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}
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negotiated := true
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_, err = connection.CreateDataChannel("data", &webrtc.DataChannelInit{
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Negotiated: &negotiated,
})
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if err != nil {
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return nil, err
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}
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connection.OnDataChannel(func(d *webrtc.DataChannel) {
d.OnMessage(func(msg webrtc.DataChannelMessage) {
if err = manager.handle(id, msg); err != nil {
manager.logger.Warn().Err(err).Msg("data handle failed")
}
})
})
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// Set the handler for ICE connection state
// This will notify you when the peer has connected/disconnected
connection.OnICEConnectionStateChange(func(connectionState webrtc.ICEConnectionState) {
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manager.logger.Info().
Str("connection_state", connectionState.String()).
Msg("connection state has changed")
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})
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rtpVideo, err := connection.AddTrack(manager.videoTrack)
if err != nil {
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return nil, err
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}
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rtpAudio, err := connection.AddTrack(manager.audioTrack)
if err != nil {
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return nil, err
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}
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connection.OnConnectionStateChange(func(state webrtc.PeerConnectionState) {
switch state {
case webrtc.PeerConnectionStateDisconnected:
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manager.logger.Info().Str("id", id).Msg("peer disconnected")
manager.sessions.Destroy(id)
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case webrtc.PeerConnectionStateFailed:
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manager.logger.Warn().Str("id", id).Msg("peer failed")
manager.sessions.Destroy(id)
case webrtc.PeerConnectionStateClosed:
manager.logger.Info().Str("id", id).Msg("peer closed")
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manager.sessions.Destroy(id)
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case webrtc.PeerConnectionStateConnected:
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manager.logger.Info().Str("id", id).Msg("peer connected")
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if err = session.SetConnected(true); err != nil {
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manager.logger.Warn().Err(err).Msg("unable to set connected on peer")
manager.sessions.Destroy(id)
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}
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}
})
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peer := &Peer{
id: id,
manager: manager,
connection: connection,
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}
connection.OnNegotiationNeeded(func() {
manager.logger.Warn().Msg("negotiation is needed")
sdp, err := peer.CreateOffer()
if err != nil {
manager.logger.Err(err).Msg("creating offer failed")
return
}
err = session.SignalLocalOffer(sdp)
if err != nil {
manager.logger.Warn().Err(err).Msg("sending SignalLocalOffer failed")
return
}
})
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connection.OnICECandidate(func(i *webrtc.ICECandidate) {
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if i == nil {
manager.logger.Info().Msg("sent all ICECandidates")
return
}
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candidateString, err := json.Marshal(i.ToJSON())
if err != nil {
manager.logger.Warn().Err(err).Msg("converting ICECandidate to json failed")
return
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}
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if err := session.SignalCandidate(string(candidateString)); err != nil {
manager.logger.Warn().Err(err).Msg("sending SignalCandidate failed")
return
}
})
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if err := session.SetPeer(peer); err != nil {
return nil, err
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}
go func() {
rtcpBuf := make([]byte, 1500)
for {
if _, _, rtcpErr := rtpVideo.Read(rtcpBuf); rtcpErr != nil {
return
}
}
}()
go func() {
rtcpBuf := make([]byte, 1500)
for {
if _, _, rtcpErr := rtpAudio.Read(rtcpBuf); rtcpErr != nil {
return
}
}
}()
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return peer, nil
}
func (manager *WebRTCManager) ICELite() bool {
return manager.config.ICELite
}
func (manager *WebRTCManager) ICEServers() []webrtc.ICEServer {
return manager.config.ICEServers
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}
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func (manager *WebRTCManager) ImplicitControl() bool {
return manager.config.ImplicitControl
}