neko/internal/webrtc/manager.go

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package webrtc
import (
"fmt"
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"net"
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"strings"
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"sync/atomic"
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"time"
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"github.com/pion/ice/v2"
"github.com/pion/interceptor"
"github.com/pion/interceptor/pkg/cc"
"github.com/pion/interceptor/pkg/gcc"
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"github.com/pion/rtcp"
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"github.com/pion/webrtc/v3"
"github.com/rs/zerolog"
"github.com/rs/zerolog/log"
"github.com/demodesk/neko/internal/config"
"github.com/demodesk/neko/internal/webrtc/cursor"
"github.com/demodesk/neko/internal/webrtc/pionlog"
"github.com/demodesk/neko/pkg/types"
"github.com/demodesk/neko/pkg/types/codec"
"github.com/demodesk/neko/pkg/types/event"
"github.com/demodesk/neko/pkg/types/message"
)
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// the duration without network activity before a Agent is considered disconnected. Default is 5 Seconds
const disconnectedTimeout = 4 * time.Second
// the duration without network activity before a Agent is considered failed after disconnected. Default is 25 Seconds
const failedTimeout = 6 * time.Second
// how often the ICE Agent sends extra traffic if there is no activity, if media is flowing no traffic will be sent. Default is 2 seconds
const keepAliveInterval = 2 * time.Second
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// send a PLI on an interval so that the publisher is pushing a keyframe every rtcpPLIInterval
const rtcpPLIInterval = 3 * time.Second
// how often we check the bitrate of each client. Default is 250ms
const bitrateCheckInterval = 250 * time.Millisecond
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func New(desktop types.DesktopManager, capture types.CaptureManager, config *config.WebRTC) *WebRTCManagerCtx {
configuration := webrtc.Configuration{
SDPSemantics: webrtc.SDPSemanticsUnifiedPlanWithFallback,
}
if !config.ICELite {
ICEServers := []webrtc.ICEServer{}
for _, server := range config.ICEServers {
var credential any
if server.Credential != "" {
credential = server.Credential
} else {
credential = false
}
ICEServers = append(ICEServers, webrtc.ICEServer{
URLs: server.URLs,
Username: server.Username,
Credential: credential,
})
}
configuration.ICEServers = ICEServers
}
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return &WebRTCManagerCtx{
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logger: log.With().Str("module", "webrtc").Logger(),
config: config,
metrics: newMetrics(),
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webrtcConfiguration: configuration,
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desktop: desktop,
capture: capture,
curImage: cursor.NewImage(desktop),
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curPosition: cursor.NewPosition(),
}
}
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type WebRTCManagerCtx struct {
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logger zerolog.Logger
config *config.WebRTC
metrics *metricsCtx
peerId int32
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desktop types.DesktopManager
capture types.CaptureManager
curImage *cursor.ImageCtx
curPosition *cursor.PositionCtx
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webrtcConfiguration webrtc.Configuration
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tcpMux ice.TCPMux
udpMux ice.UDPMux
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camStop, micStop *func()
}
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func (manager *WebRTCManagerCtx) Start() {
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manager.curImage.Start()
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logger := pionlog.New(manager.logger)
// add TCP Mux listener
if manager.config.TCPMux > 0 {
tcpListener, err := net.ListenTCP("tcp", &net.TCPAddr{
IP: net.IP{0, 0, 0, 0},
Port: manager.config.TCPMux,
})
if err != nil {
manager.logger.Panic().Err(err).Msg("unable to setup ice TCP mux")
}
manager.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
})
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}
// add UDP Mux listener
if manager.config.UDPMux > 0 {
var err error
manager.udpMux, err = ice.NewMultiUDPMuxFromPort(manager.config.UDPMux,
ice.UDPMuxFromPortWithLogger(logger.NewLogger("ice-udp")),
)
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if err != nil {
manager.logger.Panic().Err(err).Msg("unable to setup ice UDP mux")
}
}
manager.logger.Info().
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Bool("icelite", manager.config.ICELite).
Bool("icetrickle", manager.config.ICETrickle).
Interface("iceservers", manager.config.ICEServers).
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Str("nat1to1", strings.Join(manager.config.NAT1To1IPs, ",")).
Str("epr", fmt.Sprintf("%d-%d", manager.config.EphemeralMin, manager.config.EphemeralMax)).
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Int("tcpmux", manager.config.TCPMux).
Int("udpmux", manager.config.UDPMux).
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Msg("webrtc starting")
}
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func (manager *WebRTCManagerCtx) Shutdown() error {
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manager.logger.Info().Msg("shutdown")
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manager.curImage.Shutdown()
manager.curPosition.Shutdown()
return nil
}
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func (manager *WebRTCManagerCtx) ICEServers() []types.ICEServer {
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return manager.config.ICEServers
}
func (manager *WebRTCManagerCtx) newPeerConnection(bitrate int, codecs []codec.RTPCodec, logger zerolog.Logger) (*webrtc.PeerConnection, cc.BandwidthEstimator, error) {
// create media engine
engine := &webrtc.MediaEngine{}
for _, codec := range codecs {
if err := codec.Register(engine); err != nil {
return nil, nil, err
}
}
// create setting engine
settings := webrtc.SettingEngine{
LoggerFactory: pionlog.New(logger),
}
settings.SetICETimeouts(disconnectedTimeout, failedTimeout, keepAliveInterval)
settings.SetNAT1To1IPs(manager.config.NAT1To1IPs, webrtc.ICECandidateTypeHost)
settings.SetLite(manager.config.ICELite)
// make sure server answer sdp setup as passive, to not force DTLS renegotiation
// otherwise iOS renegotiation fails with: Failed to set SSL role for the transport.
settings.SetAnsweringDTLSRole(webrtc.DTLSRoleServer)
var networkType []webrtc.NetworkType
// udp candidates
if manager.udpMux != nil {
settings.SetICEUDPMux(manager.udpMux)
networkType = append(networkType,
webrtc.NetworkTypeUDP4,
webrtc.NetworkTypeUDP6,
)
} else if manager.config.EphemeralMax != 0 {
_ = settings.SetEphemeralUDPPortRange(manager.config.EphemeralMin, manager.config.EphemeralMax)
networkType = append(networkType,
webrtc.NetworkTypeUDP4,
webrtc.NetworkTypeUDP6,
)
}
// tcp candidates
if manager.tcpMux != nil {
settings.SetICETCPMux(manager.tcpMux)
networkType = append(networkType,
webrtc.NetworkTypeTCP4,
webrtc.NetworkTypeTCP6,
)
}
// enable support for TCP and UDP ICE candidates
settings.SetNetworkTypes(networkType)
// create interceptor registry
registry := &interceptor.Registry{}
congestionController, err := cc.NewInterceptor(func() (cc.BandwidthEstimator, error) {
if bitrate == 0 {
bitrate = 1_000_000
}
return gcc.NewSendSideBWE(
gcc.SendSideBWEInitialBitrate(bitrate),
gcc.SendSideBWEPacer(gcc.NewNoOpPacer()),
)
})
if err != nil {
return nil, nil, err
}
estimatorChan := make(chan cc.BandwidthEstimator, 1)
congestionController.OnNewPeerConnection(func(id string, estimator cc.BandwidthEstimator) {
estimatorChan <- estimator
})
registry.Add(congestionController)
if err = webrtc.ConfigureTWCCHeaderExtensionSender(engine, registry); err != nil {
return nil, nil, err
}
if err := webrtc.RegisterDefaultInterceptors(engine, registry); err != nil {
return nil, nil, err
}
// create new API
api := webrtc.NewAPI(
webrtc.WithMediaEngine(engine),
webrtc.WithSettingEngine(settings),
webrtc.WithInterceptorRegistry(registry),
)
// create new peer connection
configuration := manager.webrtcConfiguration
connection, err := api.NewPeerConnection(configuration)
return connection, <-estimatorChan, err
}
func (manager *WebRTCManagerCtx) CreatePeer(session types.Session, bitrate int, videoAuto bool) (*webrtc.SessionDescription, error) {
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id := atomic.AddInt32(&manager.peerId, 1)
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manager.metrics.NewConnection(session)
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// add session id to logger context
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logger := manager.logger.With().Str("session_id", session.ID()).Int32("peer_id", id).Logger()
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logger.Info().Msg("creating webrtc peer")
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// all audios must have the same codec
audio := manager.capture.Audio()
audioCodec := audio.Codec()
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// all videos must have the same codec
video := manager.capture.Video()
videoCodec := video.Codec()
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connection, estimator, err := manager.newPeerConnection(bitrate, []codec.RTPCodec{
audioCodec,
videoCodec,
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}, logger)
if err != nil {
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return nil, err
}
if bitrate == 0 {
bitrate = estimator.GetTargetBitrate()
}
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// asynchronously send local ICE Candidates
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if manager.config.ICETrickle {
connection.OnICECandidate(func(candidate *webrtc.ICECandidate) {
if candidate == nil {
logger.Debug().Msg("all local ice candidates sent")
return
}
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session.Send(
event.SIGNAL_CANDIDATE,
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message.SignalCandidate{
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ICECandidateInit: candidate.ToJSON(),
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})
})
}
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// audio track
audioTrack, err := NewTrack(logger, audioCodec, connection)
if err != nil {
return nil, err
}
// set stream for audio track
_, err = audioTrack.SetStream(audio)
if err != nil {
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return nil, err
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}
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// video track
videoTrack, err := NewTrack(logger, videoCodec, connection, WithVideoAuto(videoAuto))
if err != nil {
return nil, err
}
// let video stream bucket manager handle stream subscriptions
video.SetReceiver(videoTrack)
changeVideoFromBitrate := func(peerBitrate int) {
// when switching from manual to auto bitrate estimation, in case the estimator is
// idle (lastBitrate > maxBitrate), we want to go back to the previous estimated bitrate
if peerBitrate == 0 {
peerBitrate = estimator.GetTargetBitrate()
manager.logger.Debug().
Int("peer_bitrate", peerBitrate).
Msg("evaluated bitrate")
}
ok, err := videoTrack.SetBitrate(peerBitrate)
if err != nil {
logger.Error().Err(err).
Int("peer_bitrate", peerBitrate).
Msg("unable to set video bitrate")
return
}
if !ok {
return
}
videoID := videoTrack.stream.ID()
bitrate := videoTrack.stream.Bitrate()
manager.metrics.SetVideoID(session, videoID)
manager.logger.Debug().
Int("peer_bitrate", peerBitrate).
Int("video_bitrate", bitrate).
Str("video_id", videoID).
Msg("peer bitrate triggered video stream change")
go session.Send(
event.SIGNAL_VIDEO,
message.SignalVideo{
Video: videoID,
Bitrate: bitrate,
VideoAuto: videoTrack.VideoAuto(),
})
}
changeVideoFromID := func(videoID string) (bitrate int) {
changed, err := videoTrack.SetVideoID(videoID)
if err != nil {
logger.Error().Err(err).
Str("video_id", videoID).
Msg("unable to set video stream")
return
}
if !changed {
return
}
bitrate = videoTrack.stream.Bitrate()
manager.logger.Debug().
Str("video_id", videoID).
Int("video_bitrate", bitrate).
Msg("peer video id triggered video stream change")
go session.Send(
event.SIGNAL_VIDEO,
message.SignalVideo{
Video: videoID,
Bitrate: bitrate,
VideoAuto: videoTrack.VideoAuto(),
})
return
}
manager.logger.Info().
Int("target_bitrate", bitrate).
Msg("estimated initial peer bitrate")
// set initial video bitrate
changeVideoFromBitrate(bitrate)
// use a ticker to get current client target bitrate
go func() {
ticker := time.NewTicker(bitrateCheckInterval)
defer ticker.Stop()
for range ticker.C {
targetBitrate := estimator.GetTargetBitrate()
manager.metrics.SetReceiverEstimatedMaximumBitrate(session, float64(targetBitrate))
if connection.ConnectionState() == webrtc.PeerConnectionStateClosed {
break
}
if !videoTrack.VideoAuto() {
continue
}
changeVideoFromBitrate(targetBitrate)
}
}()
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// data channel
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dataChannel, err := connection.CreateDataChannel("data", nil)
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if err != nil {
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return nil, err
}
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peer := &WebRTCPeerCtx{
logger: logger,
connection: connection,
dataChannel: dataChannel,
changeVideoFromBitrate: changeVideoFromBitrate,
changeVideoFromID: changeVideoFromID,
// TODO: Refactor.
videoId: videoTrack.stream.ID,
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setPaused: func(isPaused bool) {
videoTrack.SetPaused(isPaused)
audioTrack.SetPaused(isPaused)
},
iceTrickle: manager.config.ICETrickle,
setVideoAuto: videoTrack.SetVideoAuto,
getVideoAuto: videoTrack.VideoAuto,
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}
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connection.OnTrack(func(track *webrtc.TrackRemote, receiver *webrtc.RTPReceiver) {
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logger := logger.With().
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Str("kind", track.Kind().String()).
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Str("mime", track.Codec().RTPCodecCapability.MimeType).
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Logger()
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logger.Info().Msgf("received new remote track")
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if !session.Profile().CanShareMedia {
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logger.Warn().Msg("media sharing is disabled for this session")
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receiver.Stop()
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return
}
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// parse codec from remote track
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codec, ok := codec.ParseRTC(track.Codec())
if !ok {
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logger.Warn().Msg("remote track with unknown codec")
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receiver.Stop()
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return
}
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var srcManager types.StreamSrcManager
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stopped := false
stopFn := func() {
if stopped {
return
}
stopped = true
receiver.Stop()
srcManager.Stop()
logger.Info().Msg("remote track stopped")
}
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if track.Kind() == webrtc.RTPCodecTypeAudio {
// audio -> microphone
srcManager = manager.capture.Microphone()
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defer stopFn()
if manager.micStop != nil {
(*manager.micStop)()
}
manager.micStop = &stopFn
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} else if track.Kind() == webrtc.RTPCodecTypeVideo {
// video -> webcam
srcManager = manager.capture.Webcam()
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defer stopFn()
if manager.camStop != nil {
(*manager.camStop)()
}
manager.camStop = &stopFn
} else {
logger.Warn().Msg("remote track with unsupported codec type")
receiver.Stop()
return
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}
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err := srcManager.Start(codec)
if err != nil {
logger.Err(err).Msg("failed to start pipeline")
return
}
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ticker := time.NewTicker(rtcpPLIInterval)
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defer ticker.Stop()
go func() {
for range ticker.C {
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err := connection.WriteRTCP([]rtcp.Packet{&rtcp.PictureLossIndication{MediaSSRC: uint32(track.SSRC())}})
if err != nil {
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logger.Err(err).Msg("remote track rtcp send err")
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}
}
}()
buf := make([]byte, 1400)
for {
i, _, err := track.Read(buf)
if err != nil {
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logger.Warn().Err(err).Msg("failed read from remote track")
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break
}
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srcManager.Push(buf[:i])
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}
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logger.Info().Msg("remote track data finished")
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})
connection.OnDataChannel(func(dc *webrtc.DataChannel) {
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logger.Info().Interface("data_channel", dc).Msg("got remote data channel")
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})
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connection.OnConnectionStateChange(func(state webrtc.PeerConnectionState) {
switch state {
case webrtc.PeerConnectionStateConnected:
session.SetWebRTCConnected(peer, true)
case webrtc.PeerConnectionStateDisconnected,
webrtc.PeerConnectionStateFailed:
connection.Close()
case webrtc.PeerConnectionStateClosed:
session.SetWebRTCConnected(peer, false)
if err = video.RemoveReceiver(videoTrack); err != nil {
logger.Err(err).Msg("failed to remove video receiver")
}
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audioTrack.RemoveStream()
}
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manager.metrics.SetState(session, state)
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})
cursorImage := func(entry *cursor.ImageEntry) {
if err := peer.SendCursorImage(entry.Cursor, entry.Image); err != nil {
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logger.Err(err).Msg("could not send cursor image")
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}
}
cursorPosition := func(x, y int) {
if session.IsHost() {
return
}
if err := peer.SendCursorPosition(x, y); err != nil {
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logger.Err(err).Msg("could not send cursor position")
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}
}
dataChannel.OnOpen(func() {
manager.curImage.AddListener(&cursorImage)
manager.curPosition.AddListener(&cursorPosition)
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// send initial cursor image
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entry, err := manager.curImage.Get()
if err == nil {
cursorImage(entry)
} else {
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logger.Err(err).Msg("failed to get cursor image")
}
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// send initial cursor position
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x, y := manager.desktop.GetCursorPosition()
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cursorPosition(x, y)
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})
dataChannel.OnClose(func() {
manager.curImage.RemoveListener(&cursorImage)
manager.curPosition.RemoveListener(&cursorPosition)
})
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dataChannel.OnMessage(func(message webrtc.DataChannelMessage) {
if err := manager.handle(message.Data, dataChannel, session); err != nil {
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logger.Err(err).Msg("data handle failed")
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}
})
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session.SetWebRTCPeer(peer)
offer, err := peer.CreateOffer(false)
if err != nil {
return nil, err
}
// on negotiation needed handler must be registered after creating initial
// offer, otherwise it can fire and intercept sucessful negotiation
connection.OnNegotiationNeeded(func() {
logger.Warn().Msg("negotiation is needed")
if connection.SignalingState() != webrtc.SignalingStateStable {
logger.Warn().Msg("connection isn't stable yet; postponing...")
return
}
offer, err := peer.CreateOffer(false)
if err != nil {
logger.Err(err).Msg("sdp offer failed")
return
}
session.Send(
event.SIGNAL_OFFER,
message.SignalDescription{
SDP: offer.SDP,
})
})
videoTrack.OnRTCP(func(packets []rtcp.Packet) {
for _, p := range packets {
if rtcpPacket, ok := p.(*rtcp.ReceiverReport); ok {
l := len(rtcpPacket.Reports)
if l > 0 {
// use only last report
manager.metrics.SetReceiverReport(session, rtcpPacket.Reports[l-1])
}
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}
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}
})
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go func() {
ticker := time.NewTicker(5 * time.Second)
defer ticker.Stop()
for range ticker.C {
if connection.ConnectionState() == webrtc.PeerConnectionStateClosed {
break
}
stats := connection.GetStats()
data, ok := stats["iceTransport"].(webrtc.TransportStats)
if ok {
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manager.metrics.SetIceTransportStats(session, data)
}
data, ok = stats["sctpTransport"].(webrtc.TransportStats)
if ok {
manager.metrics.SetSctpTransportStats(session, data)
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}
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remoteCandidates := map[string]webrtc.ICECandidateStats{}
nominatedRemoteCandidates := map[string]struct{}{}
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for _, entry := range stats {
// only remote ice candidate stats
candidate, ok := entry.(webrtc.ICECandidateStats)
if ok && candidate.Type == webrtc.StatsTypeRemoteCandidate {
manager.metrics.NewICECandidate(session, candidate)
remoteCandidates[candidate.ID] = candidate
}
// only nominated ice candidate pair stats
pair, ok := entry.(webrtc.ICECandidatePairStats)
if ok && pair.Nominated {
nominatedRemoteCandidates[pair.RemoteCandidateID] = struct{}{}
}
}
iceCandidatesUsed := []webrtc.ICECandidateStats{}
for id := range nominatedRemoteCandidates {
if candidate, ok := remoteCandidates[id]; ok {
iceCandidatesUsed = append(iceCandidatesUsed, candidate)
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}
}
manager.metrics.SetICECandidatesUsed(session, iceCandidatesUsed)
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}
}()
return offer, nil
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}
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func (manager *WebRTCManagerCtx) SetCursorPosition(x, y int) {
manager.curPosition.Set(x, y)
}