fix sleepct pausing

.gitignore

@@ -7,3 +7,4 @@ dist
 cert.pem
 *.gob
 docker-compose.yml
+mdb-local

internal/bridge/discord.go

@@ -30,6 +30,9 @@ type DiscordDuplex struct {
 	fromDiscordMap map[uint32]fromDiscord
 }
 
+var discrodSendSleepTick sleepct.SleepCT = sleepct.SleepCT{}
+var discrodReceiveSleepTick sleepct.SleepCT = sleepct.SleepCT{}
+
 // OnError gets called by dgvoice when an error is encountered.
 // By default logs to STDERR
 var OnError = func(str string, err error) {
@@ -61,8 +64,7 @@ func (dd *DiscordDuplex) discordSendPCM(ctx context.Context, wg *sync.WaitGroup,
 	// Generate Opus Silence Frame
 	opusSilence := []byte{0xf8, 0xff, 0xfe}
 
-	sleepTick := sleepct.SleepCT{}
+	discrodSendSleepTick.Start(20 * time.Millisecond)
-	sleepTick.Start(20 * time.Millisecond)
 
 	lastReady := true
 	var readyTimeout *time.Timer
@@ -100,7 +102,8 @@ func (dd *DiscordDuplex) discordSendPCM(ctx context.Context, wg *sync.WaitGroup,
 		default:
 		}
 
-		promTimerDiscordSend.Observe(float64(sleepTick.SleepNextTarget(true)))
+		// if we are not streaming try to pause
+		promTimerDiscordSend.Observe(float64(discrodSendSleepTick.SleepNextTarget(ctx, !streaming)))
 
 		if (len(pcm) > 1 && streaming) || (len(pcm) > dd.Bridge.BridgeConfig.DiscordStartStreamingCount && !streaming) {
 			if !streaming {
@@ -136,7 +139,7 @@ func (dd *DiscordDuplex) discordSendPCM(ctx context.Context, wg *sync.WaitGroup,
 				// We want to do this after alerting the user of possible short speaking cycles
 				for i := 0; i < 5; i++ {
 					internalSend(opusSilence)
-					promTimerDiscordSend.Observe(float64(sleepTick.SleepNextTarget(true)))
+					promTimerDiscordSend.Observe(float64(discrodSendSleepTick.SleepNextTarget(ctx, true)))
 				}
 
 				dd.Bridge.DiscordVoice.Speaking(false)
@@ -260,6 +263,8 @@ func (dd *DiscordDuplex) discordReceivePCM(ctx context.Context, wg *sync.WaitGro
 			}
 		}
 		dd.discordMutex.Unlock()
+
+		discrodReceiveSleepTick.Notify()
 	}
 }
 
@@ -270,8 +275,7 @@ func (dd *DiscordDuplex) fromDiscordMixer(ctx context.Context, wg *sync.WaitGrou
 	}
 	var speakingStart time.Time
 
-	sleepTick := sleepct.SleepCT{}
+	discrodReceiveSleepTick.Start(10 * time.Millisecond)
-	sleepTick.Start(10 * time.Millisecond)
 
 	sendAudio := false
 	toMumbleStreaming := false
@@ -285,7 +289,8 @@ func (dd *DiscordDuplex) fromDiscordMixer(ctx context.Context, wg *sync.WaitGrou
 		default:
 		}
 
-		promTimerDiscordMixer.Observe(float64(sleepTick.SleepNextTarget(true)))
+		// if didn't send audio try to pause
+		promTimerDiscordMixer.Observe(float64(discrodReceiveSleepTick.SleepNextTarget(ctx, !sendAudio)))
 
 		dd.discordMutex.Lock()
 
@@ -364,7 +369,7 @@ func (dd *DiscordDuplex) fromDiscordMixer(ctx context.Context, wg *sync.WaitGrou
 
 			for i := 0; i < 5; i++ {
 				mumbleTimeoutSend(mumbleSilence)
-				promTimerDiscordMixer.Observe(float64(sleepTick.SleepNextTarget(false)))
+				promTimerDiscordMixer.Observe(float64(discrodReceiveSleepTick.SleepNextTarget(ctx, false)))
 			}
 
 			toMumbleStreaming = false

internal/bridge/mumble.go

@@ -18,6 +18,8 @@ var mumbleStreamingArr []bool
 // MumbleDuplex - listenera and outgoing
 type MumbleDuplex struct{}
 
+var mumbleSleepTick sleepct.SleepCT = sleepct.SleepCT{}
+
 // OnAudioStream - Spawn routines to handle incoming packets
 func (m MumbleDuplex) OnAudioStream(e *gumble.AudioStreamEvent) {
 
@@ -42,14 +44,14 @@ func (m MumbleDuplex) OnAudioStream(e *gumble.AudioStreamEvent) {
 				localMumbleArray <- p.AudioBuffer[480*i : 480*(i+1)]
 			}
 			promReceivedMumblePackets.Inc()
+			mumbleSleepTick.Notify()
 		}
 		log.Println("Mumble audio stream ended", name)
 	}()
 }
 
 func (m MumbleDuplex) fromMumbleMixer(ctx context.Context, wg *sync.WaitGroup, toDiscord chan []int16) {
-	sleepTick := sleepct.SleepCT{}
+	mumbleSleepTick.Start(10 * time.Millisecond)
-	sleepTick.Start(10 * time.Millisecond)
 
 	sendAudio := false
 	bufferWarning := false
@@ -64,7 +66,8 @@ func (m MumbleDuplex) fromMumbleMixer(ctx context.Context, wg *sync.WaitGroup, t
 		default:
 		}
 
-		promTimerMumbleMixer.Observe(float64(sleepTick.SleepNextTarget(true)))
+		// if we sent audio on the last pass attempt to pause
+		promTimerMumbleMixer.Observe(float64(mumbleSleepTick.SleepNextTarget(ctx, !sendAudio)))
 
 		mutex.Lock()
 
@@ -125,6 +128,8 @@ func (m MumbleDuplex) fromMumbleMixer(ctx context.Context, wg *sync.WaitGroup, t
 				log.Println("Error: toDiscord buffer full. Dropping packet")
 				promToDiscordDropped.Inc()
 			}
+
+			discrodSendSleepTick.Notify()
 		}
 	}
 }

pkg/sleepct/sleepct.go

@@ -1,22 +1,25 @@
 package sleepct
 
 import (
+	"context"
 	"fmt"
 	"time"
 )
 
 // SleepCT - Sleep constant time step crates a sleep based ticker.
-// designed maintain a consistent sleep/tick interval.
+// designed to maintain a consistent sleep/tick interval.
 // The sleeper can be paused waiting to be signaled from another go routine.
 // This allows for the pausing of loops that do not have work to complete
 type SleepCT struct {
 	d      time.Duration // desired duration between targets
 	t      time.Time     // last time target
 	resume chan bool
+	wake   time.Time // last wake time
+	drift  int64     // last wake drift microseconds
 }
 
 func (s *SleepCT) Start(d time.Duration) {
-	s.resume = make(chan bool, 1)
+	s.resume = make(chan bool, 2)
 	if s.t.IsZero() {
 		s.d = d
 		s.t = time.Now()
@@ -29,31 +32,43 @@ func (s *SleepCT) Start(d time.Duration) {
 // If pause it set to true will sleep the duration and wait to be notified.
 // The notification channel will be cleared when the thread wakes.
 // SleepNextTarget should not be call more than once concurrently.
-func (s *SleepCT) SleepNextTarget(pause bool) int64 {
+func (s *SleepCT) SleepNextTarget(ctx context.Context, pause bool) int64 {
-	var last time.Time
 
 	now := time.Now()
 
+	// if target is zero safety net
 	if s.t.IsZero() {
 		fmt.Println("SleepCT reset")
-		last = now.Add(-s.d)
+		s.t = now.Add(-s.d)
-	} else {
-		last = s.t
 	}
 
 	// Sleep to Next Target
-	s.t = last.Add(s.d)
+	s.t = s.t.Add(s.d)
 
+	// Compute the desired sleep time to reach the target
 	d := time.Until(s.t)
 
+	// Sleep
 	time.Sleep(d)
 
+	// record the wake time
+	s.wake = time.Now()
+	s.drift = s.wake.Sub(s.t).Microseconds()
+
+	// fmt.Println(s.t.UnixMilli(), d.Milliseconds(), wake.UnixMilli(), drift, pause, len(s.resume))
+
+	// external pause control
 	if pause {
-		// wait until resume
+		// don't pause if the notification channel has something
 		if len(s.resume) == 0 {
-			<-s.resume
+			// fmt.Println("pause")
+			select {
+			case <-s.resume:
+			case <-ctx.Done():
+				// fmt.Println("sleepct ctx exit")
+			}
 			// if we did pause set the last sleep target to now
-			last = time.Now()
+			s.t = time.Now()
 		}
 	}
 
@@ -63,11 +78,15 @@ func (s *SleepCT) SleepNextTarget(pause bool) int64 {
 	default:
 	}
 
-	return now.Sub(s.t).Microseconds()
+	// return the drift for monitoring purposes
+	return s.drift
 }
 
 // Notify attempts to resume a paused sleeper.
 // It is safe to call notify from other processes and as often as desired.
 func (s *SleepCT) Notify() {
-	s.resume <- true
+	select {
+	case s.resume <- true:
+	default:
+	}
 }

test/timing_test.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"context"
 	"fmt"
 	"math"
 	"math/rand"
@@ -13,7 +14,7 @@ import (
 	"github.com/stieneee/tickerct"
 )
 
-const testCount int64 = 1000
+const testCount int64 = 10000
 const maxSleepInterval time.Duration = 15 * time.Millisecond
 const tickerInterval time.Duration = 10 * time.Millisecond
 const testDuration time.Duration = time.Duration(testCount * 10 * int64(time.Millisecond))
@@ -115,7 +116,7 @@ func testSleepCT(wg *sync.WaitGroup) {
 			if i+1 < testCount {
 				time.Sleep(time.Duration(float64(maxSleepInterval) * rand.Float64()))
 			}
-			s.SleepNextTarget(false)
+			s.SleepNextTarget(context.TODO(), false)
 		}
 		fmt.Println("SleepCT (loaded) after", testDuration, "drifts", time.Since(start)-testDuration)
 		wg.Done()
@@ -144,7 +145,7 @@ func testSleepCTPause(wg *sync.WaitGroup) {
 				time.Sleep(time.Duration(float64(maxSleepInterval) * rand.Float64()))
 			}
 			s.Notify()
-			s.SleepNextTarget(true)
+			s.SleepNextTarget(context.TODO(), true)
 		}
 		fmt.Println("SleepCT Pause (loaded) after", testDuration, "drifts", time.Since(start)-testDuration)
 		wg.Done()