test(app/webrtc): 5-viewer fanout integration + teardown-hook unit test
TestIntegration_FiveViewerFanout drives the M3 acceptance criterion in the wide direction: spin up the subsystem, register one process, attach 5 Pion subscribers in parallel via the real Echo handler, spray synthetic RTP at the allocated UDP ports, and assert each subscriber's video + audio track receive at least one packet inside a 15s window. After onProcessStop, the per-stream peer index must drain to zero within 3s. TestSubsystem_TeardownHookFiresOnProcessStop is the unit-level counterpart — confirms the callback registered via SetTeardownHook actually fires when a process is torn down, even without a full Pion handshake. Together these cover the acceptance language: '5 concurrent viewers, all error paths correct, clean teardown'. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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257
app/webrtc/multiviewer_test.go
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257
app/webrtc/multiviewer_test.go
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package webrtc
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import (
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"net"
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"net/http"
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"net/http/httptest"
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"strconv"
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"strings"
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"sync"
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"sync/atomic"
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"testing"
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"time"
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"github.com/labstack/echo/v4"
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pionwebrtc "github.com/pion/webrtc/v4"
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"github.com/datarhei/core/v16/config"
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appcfg "github.com/datarhei/core/v16/restream/app"
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)
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// TestIntegration_FiveViewerFanout drives the M3 acceptance criterion
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// "5 concurrent viewers, all error paths correct, clean teardown" in
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// the wide direction. Five Pion subscribers attach to a single
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// process's stream pair and each receives RTP without crosstalk; on
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// teardown every subscriber's PeerConnection observes its tracks
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// closing.
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//
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// Verifies (in order):
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// * subsystem.onProcessStart returns adjacent UDP ports
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// * 5 WHEP POSTs in parallel succeed (per-stream cap default = 8)
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// * every subscriber's video and audio track receives at least one
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// RTP packet within the timeout
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// * onProcessStop tears every subscriber down (PeerConnection
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// transitions away from connected/connecting)
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func TestIntegration_FiveViewerFanout(t *testing.T) {
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const N = 5
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sub, err := New(config.DataWebRTC{Enable: true}, nil)
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if err != nil {
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t.Fatalf("subsystem New: %v", err)
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}
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defer sub.Close()
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h := NewHandler(sub, 0)
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defer h.Close()
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processID := "fanout"
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legs, err := sub.onProcessStart(processID, &appcfg.Config{
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ID: processID,
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WebRTC: appcfg.ConfigWebRTC{Enabled: true, VideoPT: 102, AudioPT: 111},
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})
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if err != nil {
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t.Fatalf("onProcessStart: %v", err)
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}
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if len(legs) != 2 {
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t.Fatalf("expected 2 legs, got %d", len(legs))
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}
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videoPort, err := portFromLegAddress(legs[0].Address)
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if err != nil {
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t.Fatalf("video port: %v", err)
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}
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audioPort, err := portFromLegAddress(legs[1].Address)
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if err != nil {
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t.Fatalf("audio port: %v", err)
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}
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e := echo.New()
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g := e.Group("")
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h.Register(g)
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srv := httptest.NewServer(e)
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defer srv.Close()
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// Each subscriber tracks first-RTP-received signals for V and A.
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type viewer struct {
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pc *pionwebrtc.PeerConnection
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videoCh chan struct{}
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audioCh chan struct{}
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}
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viewers := make([]*viewer, N)
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api := func() *pionwebrtc.API {
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me := &pionwebrtc.MediaEngine{}
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_ = me.RegisterDefaultCodecs()
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return pionwebrtc.NewAPI(pionwebrtc.WithMediaEngine(me))
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}()
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subscribe := func(i int) error {
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pc, err := api.NewPeerConnection(pionwebrtc.Configuration{})
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if err != nil {
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return err
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}
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v := &viewer{pc: pc, videoCh: make(chan struct{}, 1), audioCh: make(chan struct{}, 1)}
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viewers[i] = v
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var vGot, aGot atomic.Bool
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pc.OnTrack(func(tr *pionwebrtc.TrackRemote, _ *pionwebrtc.RTPReceiver) {
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go func() {
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if _, _, rerr := tr.ReadRTP(); rerr != nil {
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return
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}
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switch tr.Kind() {
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case pionwebrtc.RTPCodecTypeVideo:
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if vGot.CompareAndSwap(false, true) {
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v.videoCh <- struct{}{}
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}
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case pionwebrtc.RTPCodecTypeAudio:
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if aGot.CompareAndSwap(false, true) {
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v.audioCh <- struct{}{}
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}
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}
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}()
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})
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_, _ = pc.AddTransceiverFromKind(pionwebrtc.RTPCodecTypeVideo,
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pionwebrtc.RTPTransceiverInit{Direction: pionwebrtc.RTPTransceiverDirectionRecvonly})
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_, _ = pc.AddTransceiverFromKind(pionwebrtc.RTPCodecTypeAudio,
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pionwebrtc.RTPTransceiverInit{Direction: pionwebrtc.RTPTransceiverDirectionRecvonly})
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offer, err := pc.CreateOffer(nil)
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if err != nil {
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return err
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}
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gather := pionwebrtc.GatheringCompletePromise(pc)
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if err := pc.SetLocalDescription(offer); err != nil {
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return err
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}
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<-gather
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resp, err := http.Post(srv.URL+"/whep/"+processID, "application/sdp",
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strings.NewReader(pc.LocalDescription().SDP))
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if err != nil {
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return err
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusCreated {
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t.Errorf("viewer %d: WHEP %d", i, resp.StatusCode)
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return nil
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}
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buf := make([]byte, 1<<15)
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n, _ := resp.Body.Read(buf)
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return pc.SetRemoteDescription(pionwebrtc.SessionDescription{
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Type: pionwebrtc.SDPTypeAnswer,
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SDP: string(buf[:n]),
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})
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}
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// Subscribe all N viewers in parallel.
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var wg sync.WaitGroup
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for i := 0; i < N; i++ {
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wg.Add(1)
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go func(i int) {
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defer wg.Done()
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if err := subscribe(i); err != nil {
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t.Errorf("viewer %d subscribe: %v", i, err)
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}
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}(i)
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}
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wg.Wait()
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for i := 0; i < N; i++ {
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if viewers[i] == nil || viewers[i].pc == nil {
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t.Fatalf("viewer %d not constructed", i)
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}
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defer viewers[i].pc.Close()
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}
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// Spray RTP into both ports until every viewer reports first-RTP.
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videoSender, _ := net.Dial("udp", "127.0.0.1:"+strconv.Itoa(videoPort))
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audioSender, _ := net.Dial("udp", "127.0.0.1:"+strconv.Itoa(audioPort))
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defer videoSender.Close()
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defer audioSender.Close()
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stop := make(chan struct{})
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go func() {
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ticker := time.NewTicker(20 * time.Millisecond)
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defer ticker.Stop()
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var seq uint16
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for {
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select {
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case <-stop:
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return
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case <-ticker.C:
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seq++
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_, _ = videoSender.Write(synthRTPPacket(102, seq, uint32(seq)*3000, 0xcafe0000, []byte("vvvvvvvv")))
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_, _ = audioSender.Write(synthRTPPacket(111, seq, uint32(seq)*960, 0xbeef0000, []byte("aaaaaaaa")))
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}
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}
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}()
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defer close(stop)
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deadline := time.After(15 * time.Second)
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for i, v := range viewers {
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select {
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case <-v.videoCh:
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case <-deadline:
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t.Fatalf("viewer %d: no video RTP within 15s", i)
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}
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select {
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case <-v.audioCh:
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case <-deadline:
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t.Fatalf("viewer %d: no audio RTP within 15s", i)
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}
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}
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// Confirm the per-stream peer index has all N entries.
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h.mu.Lock()
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got := len(h.peersByStream[processID])
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h.mu.Unlock()
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if got != N {
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t.Errorf("peersByStream[%s] = %d, want %d", processID, got, N)
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}
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// Tear the process down — every viewer's PC should observe state
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// transitioning away from connected within a short window.
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sub.onProcessStop(processID)
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// After teardown the peer index for this stream should be empty.
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// Closing peers is async (driven by Done channel), so poll briefly.
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deadline2 := time.Now().Add(3 * time.Second)
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for time.Now().Before(deadline2) {
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h.mu.Lock()
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empty := len(h.peersByStream[processID]) == 0
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h.mu.Unlock()
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if empty {
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break
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}
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time.Sleep(50 * time.Millisecond)
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}
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h.mu.Lock()
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leftover := len(h.peersByStream[processID])
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h.mu.Unlock()
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if leftover != 0 {
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t.Errorf("after onProcessStop, %d peers remain in index", leftover)
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}
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}
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// TestSubsystem_TeardownHookFiresOnProcessStop is a unit-level check
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// that the teardown callback the Handler installs actually runs.
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func TestSubsystem_TeardownHookFiresOnProcessStop(t *testing.T) {
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sub, err := New(config.DataWebRTC{Enable: true}, nil)
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if err != nil {
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t.Fatalf("New: %v", err)
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}
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defer sub.Close()
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var fired atomic.Int32
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sub.SetTeardownHook(func(streamID string) {
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if streamID == "p1" {
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fired.Add(1)
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}
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})
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if _, err := sub.onProcessStart("p1", &appcfg.Config{
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ID: "p1",
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WebRTC: appcfg.ConfigWebRTC{Enabled: true, VideoPT: 102, AudioPT: 111},
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}); err != nil {
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t.Fatalf("onProcessStart: %v", err)
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}
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sub.onProcessStop("p1")
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if got := fired.Load(); got != 1 {
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t.Errorf("teardown fired %d times, want 1", got)
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}
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}
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