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e855620379
Due to the order of events in MediaTrackReceiver and friends, SubscribedTrack will be closed before the track is removed from RoomTrackManager. Because of this, when a track is unpublished, it's possible to be subscribed to the track as it's closing. By introducing a closing state, we'd prevent accidental subscription to closing tracks.
126 lines
3.5 KiB
Go
126 lines
3.5 KiB
Go
/*
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* Copyright 2023 LiveKit, Inc
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package rtc
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import (
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"sync"
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"github.com/livekit/livekit-server/pkg/rtc/types"
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"github.com/livekit/livekit-server/pkg/utils"
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"github.com/livekit/protocol/livekit"
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)
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// RoomTrackManager holds tracks that are published to the room
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type RoomTrackManager struct {
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lock sync.RWMutex
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changedNotifier *utils.ChangeNotifierManager
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removedNotifier *utils.ChangeNotifierManager
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tracks map[livekit.TrackID]*TrackInfo
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}
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type TrackInfo struct {
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Track types.MediaTrack
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PublisherIdentity livekit.ParticipantIdentity
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PublisherID livekit.ParticipantID
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}
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func NewRoomTrackManager() *RoomTrackManager {
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return &RoomTrackManager{
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tracks: make(map[livekit.TrackID]*TrackInfo),
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changedNotifier: utils.NewChangeNotifierManager(),
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removedNotifier: utils.NewChangeNotifierManager(),
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}
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}
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func (r *RoomTrackManager) AddTrack(track types.MediaTrack, publisherIdentity livekit.ParticipantIdentity, publisherID livekit.ParticipantID) {
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r.lock.Lock()
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r.tracks[track.ID()] = &TrackInfo{
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Track: track,
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PublisherIdentity: publisherIdentity,
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PublisherID: publisherID,
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}
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r.lock.Unlock()
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r.NotifyTrackChanged(track.ID())
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}
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func (r *RoomTrackManager) RemoveTrack(track types.MediaTrack) {
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r.lock.Lock()
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// ensure we are removing the same track as added
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info, ok := r.tracks[track.ID()]
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if !ok || info.Track != track {
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r.lock.Unlock()
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return
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}
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delete(r.tracks, track.ID())
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r.lock.Unlock()
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n := r.removedNotifier.GetNotifier(string(track.ID()))
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if n != nil {
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n.NotifyChanged()
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}
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r.changedNotifier.RemoveNotifier(string(track.ID()), true)
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r.removedNotifier.RemoveNotifier(string(track.ID()), true)
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}
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func (r *RoomTrackManager) GetTrackInfo(trackID livekit.TrackID) *TrackInfo {
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r.lock.RLock()
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defer r.lock.RUnlock()
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info := r.tracks[trackID]
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if info == nil {
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return nil
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}
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// when track is about to close, do not resolve
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if info.Track != nil && !info.Track.IsOpen() {
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return nil
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}
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return info
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}
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func (r *RoomTrackManager) NotifyTrackChanged(trackID livekit.TrackID) {
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n := r.changedNotifier.GetNotifier(string(trackID))
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if n != nil {
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n.NotifyChanged()
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}
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}
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// HasObservers lets caller know if the current media track has any observers
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// this is used to signal interest in the track. when another MediaTrack with the same
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// trackID is being used, track is not considered to be observed.
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func (r *RoomTrackManager) HasObservers(track types.MediaTrack) bool {
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n := r.changedNotifier.GetNotifier(string(track.ID()))
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if n == nil || !n.HasObservers() {
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return false
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}
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info := r.GetTrackInfo(track.ID())
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if info == nil || info.Track != track {
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return false
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}
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return true
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}
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func (r *RoomTrackManager) GetOrCreateTrackChangeNotifier(trackID livekit.TrackID) *utils.ChangeNotifier {
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return r.changedNotifier.GetOrCreateNotifier(string(trackID))
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}
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func (r *RoomTrackManager) GetOrCreateTrackRemoveNotifier(trackID livekit.TrackID) *utils.ChangeNotifier {
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return r.removedNotifier.GetOrCreateNotifier(string(trackID))
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}
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