Merge branch 'v0.5.0' into main

2024-12-27 17:05:40 -05:00 · 2021-12-13 00:17:30 -05:00 · 2021-12-13 00:17:30 -05:00 · c410c49095
commit c410c49095
parent df2a477147 08b4eb3771
23 changed files with 1908 additions and 178 deletions
--- a/.github/workflows/build-release.yml
+++ b/.github/workflows/build-release.yml
@ -20,7 +20,13 @@ jobs:
        name: Set up Go
        uses: actions/setup-go@v2
        with:
-          go-version: 1.15
+          go-version: 1.17
+      -
+        name: go-license install
+        run: go get github.com/google/go-licenses
+      -
+        name: go-license save
+        run: go-licenses save ./cmd/mumble-discord-bridge --force --save_path="./dist/LICENSES"
      -
        name: Run GoReleaser
        uses: goreleaser/goreleaser-action@v2
@ -29,4 +35,10 @@ jobs:
          version: latest
          args: release --rm-dist
        env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+      -
+        name: Upload assets
+        uses: actions/upload-artifact@v2
+        with:
+          name: mdb
+          path: dist/*
--- a/.gitignore
+++ b/.gitignore
@ -5,4 +5,6 @@ dist
 *.out
 *.test
 cert.pem
-*.gob
+*.gob
+docker-compose.yml
+mdb-local
--- a/9
+++ b/9
@ -2,12 +2,14 @@

 # Stage 1

-FROM golang:1.16 as builder
+FROM golang:1.17 as builder
 WORKDIR /go/src/app 
 COPY . .
-RUN curl -sfL https://install.goreleaser.com/github.com/goreleaser/goreleaser.sh | sh
 RUN apt update && apt install -y libopus-dev
-RUN ./bin/goreleaser build --skip-validate
+RUN go install github.com/goreleaser/goreleaser@latest
+RUN go install github.com/google/go-licenses@latest
+RUN goreleaser build --skip-validate
+RUN go-licenses save ./cmd/mumble-discord-bridge --force --save_path="./dist/LICENSES"

 # Stage 2

@ -15,6 +17,7 @@ FROM alpine:latest as final
 WORKDIR /opt/
 RUN apk add opus
 RUN mkdir /lib64 && ln -s /lib/libc.musl-x86_64.so.1 /lib64/ld-linux-x86-64.so.2
+COPY --from=builder /go/src/app/dist/LICENSES .
 COPY --from=builder /go/src/app/dist/mumble-discord-bridge_linux_amd64/mumble-discord-bridge .

 # FROM ubuntu:latest as final
--- a/1
+++ b/1
@ -2,6 +2,7 @@ GOFILES=$(shell find ./ -type f -name '*.go')

 mumble-discord-bridge: $(GOFILES) .goreleaser.yml
 	goreleaser build --skip-validate --rm-dist
+	go-licenses save ./cmd/mumble-discord-bridge --force --save_path="./dist/LICENSES"

 dev: $(GOFILES) .goreleaser.yml
 	goreleaser build --skip-validate --rm-dist && sudo ./dist/mumble-discord-bridge_linux_amd64/mumble-discord-bridge
--- a/README.md
+++ b/README.md
@ -10,48 +10,6 @@ Several configuration variables must be set for the binary to function correctly
 All variables can be set using flags or in the environment.
 The binary will also attempt to load .env file located in the working directory.

-```bash
-Usage of ./mumble-discord-bridge:
-  -cpuprofile file
-     write cpu profile to file
-  -debug-level int
-     DEBUG_LEVEL, Discord debug level, optional, (default 1) (default 1)
-  -discord-cid string
-     DISCORD_CID, discord cid, required
-  -discord-command string
-     DISCORD_COMMAND, Discord command string, env alt DISCORD_COMMAND, optional, (defaults mumble-discord) (default "mumble-discord")
-  -discord-disable-text
-     DISCORD_DISABLE_TEXT, disable sending direct messages to discord, (default false)
-  -discord-gid string
-     DISCORD_GID, discord gid, required
-  -discord-token string
-     DISCORD_TOKEN, discord bot token, required
-  -mode string
-     MODE, [constant, manual, auto] determine which mode the bridge starts in, (default constant) (default "constant")
-  -mumble-address string
-     MUMBLE_ADDRESS, mumble server address, example example.com, required
-  -mumble-certificate string
-     MUMBLE_CERTIFICATE, client certificate to use when connecting to the Mumble server
-  -mumble-channel string
-     MUMBLE_CHANNEL, mumble channel to start in, using '/' to separate nested channels, optional
-  -mumble-disable-text
-     MUMBLE_DISABLE_TEXT, disable sending text to mumble, (default false)
-  -mumble-insecure bool ("true" or "false")
-      MUMBLE_INSECURE, mumble insecure, optional, (default false)
-  -mumble-password string
-     MUMBLE_PASSWORD, mumble password, optional
-  -mumble-port int
-     MUMBLE_PORT, mumble port, (default 64738) (default 64738)
-  -mumble-username string
-     MUMBLE_USERNAME, mumble username, (default: discord) (default "Discord")
-  -nice
-     NICE, whether the bridge should automatically try to 'nice' itself, (default false)
-  -to-discord-buffer int
-     TO_DISCORD_BUFFER, Jitter buffer from Mumble to Discord to absorb timing issues related to network, OS and hardware quality. (Increments of 10ms) (default 50)
-  -to-mumble-buffer int
-     TO_MUMBLE_BUFFER, Jitter buffer from Discord to Mumble to absorb timing issues related to network, OS and hardware quality. (Increments of 10ms) (default 50)
-```
-
 The bridge can be run with the follow modes:

 ```bash
@ -99,6 +57,8 @@ The bot requires the following permissions:
 * Voice Channel Speak
 * Voice Channel Use Voice Activity

+Permission integer 36768768.
+
 ### Finding Discord CID and GID

 Discord GID is a unique ID linked to one Discord Server, also called Guild. CID is similarly a unique ID for a Discord Channel. To find these you need to set Discord into developer Mode.
@ -187,6 +147,13 @@ A default jitter of 50ms should be adequate for most scenarios.
 A warning will be logged if short burst or audio are seen.
 A single warning can be ignored multiple warnings in short time spans would suggest the need for a larger jitter buffer.

+## Monitoring the Bridge
+
+The bridge can be started with a Prometheus metrics endpoint enabled.
+The example folder contains the a docker-compose file that will spawn the bridge, Prometheus and Grafana configured to serve a single a pre-configured dashboard.
+
+![Mumble Discord Bridge Grafana Dashboard](example/grafana-dashboard.png "Grafana Dashboard")
+
 ## Known Issues

 Currently there is an issue opening the discord voice channel.
--- a/cmd/mumble-discord-bridge/main.go
+++ b/cmd/mumble-discord-bridge/main.go
@ -50,9 +50,12 @@ func main() {
 	discordSendBuffer := flag.Int("to-discord-buffer", lookupEnvOrInt("TO_DISCORD_BUFFER", 50), "TO_DISCORD_BUFFER, Jitter buffer from Mumble to Discord to absorb timing issues related to network, OS and hardware quality. (Increments of 10ms)")
 	discordCommand := flag.String("discord-command", lookupEnvOrString("DISCORD_COMMAND", "mumble-discord"), "DISCORD_COMMAND, Discord command string, env alt DISCORD_COMMAND, optional, (defaults mumble-discord)")
 	discordDisableText := flag.Bool("discord-disable-text", lookupEnvOrBool("DISCORD_DISABLE_TEXT", false), "DISCORD_DISABLE_TEXT, disable sending direct messages to discord, (default false)")
+	discordDisableBotStatus := flag.Bool("discord-disable-bot-status", lookupEnvOrBool("DISCORD_DISABLE_BOT_STATUS", false), "DISCORD_DISABLE_BOT_STATUS, disable updating bot status, (default false)")
 	mode := flag.String("mode", lookupEnvOrString("MODE", "constant"), "MODE, [constant, manual, auto] determine which mode the bridge starts in, (default constant)")
 	nice := flag.Bool("nice", lookupEnvOrBool("NICE", false), "NICE, whether the bridge should automatically try to 'nice' itself, (default false)")
 	debug := flag.Int("debug-level", lookupEnvOrInt("DEBUG", 1), "DEBUG_LEVEL, Discord debug level, optional, (default 1)")
+	promEnable := flag.Bool("prometheus-enable", lookupEnvOrBool("PROMETHEUS_ENABLE", false), "PROMETHEUS_ENABLE, Enable prometheus metrics")
+	promPort := flag.Int("prometheus-port", lookupEnvOrInt("PROMETHEUS_PORT", 9559), "PROMETHEUS_PORT, Prometheus metrics port, optional, (default 9559)")

 	cpuprofile := flag.String("cpuprofile", "", "write cpu profile to `file`")

@ -85,6 +88,10 @@ func main() {
 		}
 	}

+	if *promEnable {
+		go bridge.StartPromServer(*promPort)
+	}
+
 	// Optional CPU Profiling
 	if *cpuprofile != "" {
 		f, err := os.Create(*cpuprofile)
@ -129,6 +136,7 @@ func main() {
 			CID:                        *discordCID,
 			DiscordStartStreamingCount: discordStartStreamingCount,
 			DiscordDisableText:         *discordDisableText,
+			DiscordDisableBotStatus:    *discordDisableBotStatus,
 			Version:                    version,
 		},
 		Connected:    false,
@ -136,6 +144,8 @@ func main() {
 		MumbleUsers:  make(map[string]bool),
 	}

+	bridge.PromApplicationStartTime.SetToCurrentTime()
+
 	// MUMBLE SETUP
 	Bridge.BridgeConfig.MumbleConfig = gumble.NewConfig()
 	Bridge.BridgeConfig.MumbleConfig.Username = *mumbleUsername
@ -149,6 +159,7 @@ func main() {
 	Bridge.BridgeConfig.MumbleConfig.Attach(gumbleutil.Listener{
 		Connect:    Bridge.MumbleListener.MumbleConnect,
 		UserChange: Bridge.MumbleListener.MumbleUserChange,
+		// ChannelChange: Bridge.MumbleListener.MumbleChannelChange,
 	})

 	// DISCORD SETUP
@ -198,11 +209,6 @@ func main() {
 		Bridge.Mode = bridge.BridgeModeConstant
 		Bridge.DiscordChannelID = Bridge.BridgeConfig.CID
 		go func() {
-			defer func() {
-				if r := recover(); r != nil {
-					fmt.Println("Bridge paniced", r)
-				}
-			}()
 			for {
 				Bridge.StartBridge()
 				log.Println("Bridge died")
--- a/example/docker-compose.bridge.yml
+++ b/example/docker-compose.bridge.yml
@ -1,3 +1,6 @@
+# This a basic docker-compose file to run an instance an instance of Mumble-Discord-Bridge
+# docker-compose -f ./docker-compose.yml up -d
+
 version: "3"
   
 services:
--- a/example/docker-compose.monitoring.yaml
+++ b/example/docker-compose.monitoring.yaml
@ -0,0 +1,69 @@
+# This docker compose file contians an exmaple of staring Mumble-Discord-Bridge with Prometheus and Grafana
+# The monitoring folder is need to provide the nesscary default configs for Promethus and Grafana
+# Prometheus port 9090
+# Grafana port 3030
+
+version: '3.8'
+
+volumes:
+    prometheus_data: {}
+    grafana_data: {}
+
+services:
+
+  services:
+  mumble-discord-bridge:
+    image: stieneee/mumble-discord-bridge
+    restart: unless-stopped
+    networks:
+      - mdb
+    environment:
+      - MUMBLE_ADDRESS=example.com"
+      - MUMBLE_USERNAME=discord-bridge
+      - MUMBLE_PASSWORD=password
+      - DISCORD_TOKEN=token
+      - DISCORD_GID=gid
+      - DISCORD_CID=cid
+
+  prometheus:
+    image: prom/prometheus:latest
+    container_name: prometheus
+    volumes:
+      - ./prometheus:/etc/prometheus
+      - prometheus_data:/prometheus
+    command:
+      - '--config.file=/etc/prometheus/prometheus.yml'
+      - '--storage.tsdb.path=/prometheus'
+      - '--web.console.libraries=/etc/prometheus/console_libraries'
+      - '--web.console.templates=/etc/prometheus/consoles'
+      - '--storage.tsdb.retention.time=200h'
+      - '--web.enable-lifecycle'
+    restart: unless-stopped
+    expose:
+      - 9090
+    ports:
+      - 9090:9090
+    depends_on: 
+      - mumble-discord-bridge
+
+  grafana:
+    image: grafana/grafana:latest
+    container_name: grafana
+    volumes:
+      # - grafana_data:/var/lib/grafana
+      - ./grafana/provisioning/dashboards:/etc/grafana/provisioning/dashboards
+      - ./grafana/provisioning/datasources:/etc/grafana/provisioning/datasources
+    environment:
+      # - GF_SECURITY_ADMIN_USER=${ADMIN_USER:-admin}
+      # - GF_SECURITY_ADMIN_PASSWORD=${ADMIN_PASSWORD:-admin}
+      - GF_USERS_ALLOW_SIGN_UP=false
+      - GF_AUTH_ANONYMOUS_ENABLED=true
+      - GF_AUTH_ANONYMOUS_ORG_NAME=Main Org.
+      - GF_AUTH_ANONYMOUS_ORG_ROLE=Editor
+    restart: unless-stopped
+    expose:
+      - 3000
+    ports:
+      - 3030:3000
+    depends_on: 
+      - prometheus
--- a/example/grafana-dashboard.png
+++ b/example/grafana-dashboard.png
--- a/example/monitoring/grafana/provisioning/dashboards/dashboards.yml
+++ b/example/monitoring/grafana/provisioning/dashboards/dashboards.yml
@ -0,0 +1,24 @@
+apiVersion: 1
+
+providers:
+  # <string> an unique provider name. Required
+  - name: 'MDB'
+    # <int> Org id. Default to 1
+    orgId: 1
+    # <string> name of the dashboard folder.
+    folder: ''
+    # <string> folder UID. will be automatically generated if not specified
+    folderUid: ''
+    # <string> provider type. Default to 'file'
+    type: file
+    # <bool> disable dashboard deletion
+    disableDeletion: false
+    # <int> how often Grafana will scan for changed dashboards
+    updateIntervalSeconds: 30
+    # <bool> allow updating provisioned dashboards from the UI
+    allowUiUpdates: true
+    options:
+      # <string, required> path to dashboard files on disk. Required when using the 'file' type
+      path: /etc/grafana/provisioning/dashboards
+      # <bool> use folder names from filesystem to create folders in Grafana
+      foldersFromFilesStructure: false
--- a/example/monitoring/grafana/provisioning/dashboards/mumble-discord-bridge.json
+++ b/example/monitoring/grafana/provisioning/dashboards/mumble-discord-bridge.json
--- a/example/monitoring/grafana/provisioning/datasources/datasource.yml
+++ b/example/monitoring/grafana/provisioning/datasources/datasource.yml
@ -0,0 +1,11 @@
+apiVersion: 1
+
+datasources:
+  - name: Prometheus
+    type: prometheus
+    access: proxy
+    orgId: 1
+    url: http://prometheus:9090
+    basicAuth: false
+    isDefault: true
+    editable: true
--- a/example/monitoring/prometheus/prometheus.yml
+++ b/example/monitoring/prometheus/prometheus.yml
@ -0,0 +1,12 @@
+global:
+  scrape_interval:     15s
+  evaluation_interval: 15s
+
+# A scrape configuration containing exactly one endpoint to scrape.
+scrape_configs:
+  - job_name: 'mdb'
+    scrape_interval: 1s
+    static_configs:
+      - targets: [
+        'mumble-discord-bridge:9559',
+      ]
--- a/go.mod
+++ b/go.mod
@ -5,9 +5,9 @@ go 1.15
 require (
 	github.com/bwmarrin/discordgo v0.23.3-0.20210512035133-7d7206b01bb5
 	github.com/joho/godotenv v1.3.0
+	github.com/prometheus/client_golang v1.11.0
 	github.com/stieneee/gopus v0.0.0-20210424193312-6d10f6090335
 	github.com/stieneee/gumble v0.0.0-20210424210604-732f48b5e0de
 	github.com/stieneee/tickerct v0.0.0-20210420020607-d1b092aa40e9
 	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad // indirect
-	golang.org/x/sys v0.0.0-20210108172913-0df2131ae363 // indirect
 )
--- a/go.sum
+++ b/go.sum
@ -1,38 +1,159 @@
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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 github.com/bwmarrin/discordgo v0.23.3-0.20210512035133-7d7206b01bb5/go.mod h1:OMKxbTmkKofBjBi4/yidO3ItxbJ6PUfEUkjchM4En8c=
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--- a/internal/bridge/bridge.go
+++ b/internal/bridge/bridge.go
@ -42,6 +42,7 @@ type BridgeConfig struct {
 	CID                        string
 	DiscordStartStreamingCount int
 	DiscordDisableText         bool
+	DiscordDisableBotStatus    bool
 	Version                    string
 }

@ -119,6 +120,9 @@ func (b *BridgeState) StartBridge() {

 	var err error

+	promBridgeStarts.Inc()
+	promBridgeStartTime.SetToCurrentTime()
+
 	// DISCORD Connect Voice
 	log.Println("Attempting to join Discord voice channel")
 	if b.DiscordChannelID == "" {
@ -138,7 +142,7 @@ func (b *BridgeState) StartBridge() {

 	// MUMBLE Connect

-	b.MumbleStream = &MumbleDuplex{}
+	b.MumbleStream = NewMumbleDuplex()
 	det := b.BridgeConfig.MumbleConfig.AudioListeners.Attach(b.MumbleStream)
 	defer det.Detach()

@ -177,26 +181,40 @@ func (b *BridgeState) StartBridge() {
 	defer close(toDiscord)
 	defer close(toMumble)

+	// From Discord
+	b.DiscordStream = NewDiscordDuplex(b)
+
 	// Start Passing Between

 	// From Mumble
-	go b.MumbleStream.fromMumbleMixer(ctx, &wg, toDiscord)
-
-	// From Discord
-	b.DiscordStream = &DiscordDuplex{
-		Bridge:         b,
-		fromDiscordMap: make(map[uint32]fromDiscord),
-	}
-
-	go b.DiscordStream.discordReceivePCM(ctx, &wg, cancel)
-	go b.DiscordStream.fromDiscordMixer(ctx, &wg, toMumble)
-
-	// To Discord
-	go b.DiscordStream.discordSendPCM(ctx, &wg, cancel, toDiscord)
-
-	// Monitor Mumble
 	wg.Add(1)
 	go func() {
+		defer wg.Done()
+		b.MumbleStream.fromMumbleMixer(ctx, cancel, toDiscord)
+	}()
+
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		b.DiscordStream.discordReceivePCM(ctx, cancel)
+	}()
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		b.DiscordStream.fromDiscordMixer(ctx, toMumble)
+	}()
+
+	// To Discord
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
+		b.DiscordStream.discordSendPCM(ctx, cancel, toDiscord)
+	}()
+
+	// Monitor
+	wg.Add(1)
+	go func() {
+		defer wg.Done()
 		ticker := time.NewTicker(500 * time.Millisecond)
 		for {
 			select {
@ -210,7 +228,6 @@ func (b *BridgeState) StartBridge() {
 					cancel()
 				}
 			case <-ctx.Done():
-				wg.Done()
 				return
 			}
 		}
@ -252,6 +269,9 @@ func (b *BridgeState) DiscordStatusUpdate() {
 			log.Printf("error pinging mumble server %v\n", err)
 			b.DiscordSession.UpdateListeningStatus("an error pinging mumble")
 		} else {
+
+			promMumblePing.Set(float64(resp.Ping.Milliseconds()))
+
 			b.MumbleUsersMutex.Lock()
 			b.BridgeMutex.Lock()
 			b.MumbleUserCount = resp.ConnectedUsers
@ -269,8 +289,16 @@ func (b *BridgeState) DiscordStatusUpdate() {
 			}
 			b.BridgeMutex.Unlock()
 			b.MumbleUsersMutex.Unlock()
-			b.DiscordSession.UpdateListeningStatus(status)
+			if !b.BridgeConfig.DiscordDisableBotStatus {
+				b.DiscordSession.UpdateListeningStatus(status)
+			}
 		}
+
+		discordHeartBeat := b.DiscordSession.LastHeartbeatAck.Sub(b.DiscordSession.LastHeartbeatSent).Milliseconds()
+		if discordHeartBeat > 0 {
+			promDiscordHeartBeat.Set(float64(discordHeartBeat))
+		}
+
 	}
 }

--- a/internal/bridge/discord-handlers.go
+++ b/internal/bridge/discord-handlers.go
@ -227,9 +227,13 @@ func (l *DiscordListener) VoiceUpdate(s *discordgo.Session, event *discordgo.Voi
 						l.Bridge.MumbleClient.Self.Channel.Send(fmt.Sprintf("%v has left Discord channel\n", l.Bridge.DiscordUsers[id].username), false)
 					})
 				}
-				l.Bridge.BridgeMutex.Unlock()
 				delete(l.Bridge.DiscordUsers, id)
+				l.Bridge.BridgeMutex.Unlock()
 			}
 		}
+
+		l.Bridge.BridgeMutex.Lock()
+		promDiscordUsers.Set(float64(len(l.Bridge.DiscordUsers)))
+		l.Bridge.BridgeMutex.Unlock()
 	}
 }
--- a/internal/bridge/discord.go
+++ b/internal/bridge/discord.go
@ -26,8 +26,19 @@ type fromDiscord struct {
 type DiscordDuplex struct {
 	Bridge *BridgeState

-	discordMutex   sync.Mutex
-	fromDiscordMap map[uint32]fromDiscord
+	discordMutex            sync.Mutex
+	fromDiscordMap          map[uint32]fromDiscord
+	discordSendSleepTick    sleepct.SleepCT
+	discordReceiveSleepTick sleepct.SleepCT
+}
+
+func NewDiscordDuplex(b *BridgeState) *DiscordDuplex {
+	return &DiscordDuplex{
+		Bridge:                  b,
+		fromDiscordMap:          make(map[uint32]fromDiscord),
+		discordSendSleepTick:    sleepct.SleepCT{},
+		discordReceiveSleepTick: sleepct.SleepCT{},
+	}
 }

 // OnError gets called by dgvoice when an error is encountered.
@ -43,8 +54,8 @@ var OnError = func(str string, err error) {
 }

 // SendPCM will receive on the provied channel encode
-// received PCM data into Opus then send that to Discordgo
-func (dd *DiscordDuplex) discordSendPCM(ctx context.Context, wg *sync.WaitGroup, cancel context.CancelFunc, pcm <-chan []int16) {
+// received PCM data with Opus then send that to Discordgo
+func (dd *DiscordDuplex) discordSendPCM(ctx context.Context, cancel context.CancelFunc, pcm <-chan []int16) {
 	const channels int = 1
 	const frameRate int = 48000              // audio sampling rate
 	const frameSize int = 960                // uint16 size of each audio frame
@ -61,14 +72,27 @@ func (dd *DiscordDuplex) discordSendPCM(ctx context.Context, wg *sync.WaitGroup,
 	// Generate Opus Silence Frame
 	opusSilence := []byte{0xf8, 0xff, 0xfe}

-	sleepTick := sleepct.SleepCT{}
-	sleepTick.Start(20 * time.Millisecond)
+	dd.discordSendSleepTick.Start(20 * time.Millisecond)

 	lastReady := true
 	var readyTimeout *time.Timer
 	var speakingStart time.Time

-	wg.Add(1)
+	// Spy on the PCM channel to notify
+	// TODO determine a method to notify a paused sleepct
+	// pcm := make(chan []int16, 10)
+	// go func() {
+	// 	for {
+	// 		t, ok := <-pcmIn
+	// 		if !ok {
+	// 			close(pcm)
+	// 			return
+	// 		} else {
+	// 			dd.discordSendSleepTick.Notify()
+	// 			pcm <- t
+	// 		}
+	// 	}
+	// }()

 	internalSend := func(opus []byte) {
 		dd.Bridge.DiscordVoice.RWMutex.RLock()
@ -86,7 +110,12 @@ func (dd *DiscordDuplex) discordSendPCM(ctx context.Context, wg *sync.WaitGroup,
 			lastReady = true
 			readyTimeout.Stop()
 		} else {
-			dd.Bridge.DiscordVoice.OpusSend <- opus
+			select {
+			case dd.Bridge.DiscordVoice.OpusSend <- opus:
+			case <-ctx.Done():
+			}
+
+			promDiscordSentPackets.Inc()
 		}
 		dd.Bridge.DiscordVoice.RWMutex.RUnlock()
 	}
@ -94,12 +123,14 @@ func (dd *DiscordDuplex) discordSendPCM(ctx context.Context, wg *sync.WaitGroup,
 	for {
 		select {
 		case <-ctx.Done():
-			wg.Done()
+			log.Println("Stopping Discord send PCM")
 			return
 		default:
 		}

-		sleepTick.SleepNextTarget()
+		// if we are not streaming try to pause
+		// promTimerDiscordSend.Observe(float64(dd.discordSendSleepTick.SleepNextTarget(ctx, !streaming)))
+		promTimerDiscordSend.Observe(float64(dd.discordSendSleepTick.SleepNextTarget(ctx, false)))

 		if (len(pcm) > 1 && streaming) || (len(pcm) > dd.Bridge.BridgeConfig.DiscordStartStreamingCount && !streaming) {
 			if !streaming {
@ -126,7 +157,7 @@ func (dd *DiscordDuplex) discordSendPCM(ctx context.Context, wg *sync.WaitGroup,
 				// It is possible that short speaking cycle is the result of a short input to mumble (Not a problem). ie a quick tap of push to talk button.
 				// Or when timing delays are introduced via network, hardware or kernel delays (Problem).
 				// The problem delays result in choppy or stuttering sounds, especially when the silence frames are introduced into the opus frames below.
-				// Multiple short cycle delays can result in a Discrod rate limiter being trigger due to of multiple JSON speaking/not-speaking state changes
+				// Multiple short cycle delays can result in a discord rate limiter being trigger due to of multiple JSON speaking/not-speaking state changes
 				if time.Since(speakingStart).Milliseconds() < 50 {
 					log.Println("Warning: Short Mumble to Discord speaking cycle. Consider increaseing the size of the to Discord jitter buffer.")
 				}
@ -135,7 +166,9 @@ 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)
-					sleepTick.SleepNextTarget()
+					// promTimerDiscordSend.Observe(float64(dd.discordSendSleepTick.SleepNextTarget(ctx, true)))
+					promTimerDiscordSend.Observe(float64(dd.discordSendSleepTick.SleepNextTarget(ctx, false)))
+
 				}

 				dd.Bridge.DiscordVoice.Speaking(false)
@ -147,7 +180,7 @@ func (dd *DiscordDuplex) discordSendPCM(ctx context.Context, wg *sync.WaitGroup,

 // ReceivePCM will receive on the the Discordgo OpusRecv channel and decode
 // the opus audio into PCM then send it on the provided channel.
-func (dd *DiscordDuplex) discordReceivePCM(ctx context.Context, wg *sync.WaitGroup, cancel context.CancelFunc) {
+func (dd *DiscordDuplex) discordReceivePCM(ctx context.Context, cancel context.CancelFunc) {
 	var err error

 	lastReady := true
@ -158,8 +191,6 @@ func (dd *DiscordDuplex) discordReceivePCM(ctx context.Context, wg *sync.WaitGro
 		zeros[i] = 0
 	}

-	wg.Add(1)
-
 	for {
 		dd.Bridge.DiscordVoice.RWMutex.RLock()
 		if !dd.Bridge.DiscordVoice.Ready || dd.Bridge.DiscordVoice.OpusRecv == nil {
@ -184,7 +215,7 @@ func (dd *DiscordDuplex) discordReceivePCM(ctx context.Context, wg *sync.WaitGro

 		select {
 		case <-ctx.Done():
-			wg.Done()
+			log.Println("Stopping Discord receive PCM")
 			return
 		case p, ok = <-dd.Bridge.DiscordVoice.OpusRecv:
 		}
@ -234,7 +265,7 @@ func (dd *DiscordDuplex) discordReceivePCM(ctx context.Context, wg *sync.WaitGro
 		dd.fromDiscordMap[p.SSRC] = s
 		dd.discordMutex.Unlock()

-		p.PCM, err = s.decoder.Decode(p.Opus, deltaT*2, false)
+		p.PCM, err = s.decoder.Decode(p.Opus, deltaT, false)
 		if err != nil {
 			OnError("Error decoding opus data", err)
 			continue
@ -242,6 +273,8 @@ func (dd *DiscordDuplex) discordReceivePCM(ctx context.Context, wg *sync.WaitGro

 		// fmt.Println(p.SSRC, p.Type, deltaT, p.Sequence, p.Sequence-s.lastSequence, oldReceiving, s.streaming, len(p.Opus), len(p.PCM))

+		promDiscordReceivedPackets.Inc()
+
 		// Push data into pcm channel in 10ms chunks of mono pcm data
 		dd.discordMutex.Lock()
 		for l := 0; l < len(p.PCM); l = l + 480 {
@ -257,37 +290,41 @@ func (dd *DiscordDuplex) discordReceivePCM(ctx context.Context, wg *sync.WaitGro
 			}
 		}
 		dd.discordMutex.Unlock()
+
+		dd.discordReceiveSleepTick.Notify()
 	}
 }

-func (dd *DiscordDuplex) fromDiscordMixer(ctx context.Context, wg *sync.WaitGroup, toMumble chan<- gumble.AudioBuffer) {
+func (dd *DiscordDuplex) fromDiscordMixer(ctx context.Context, toMumble chan<- gumble.AudioBuffer) {
 	mumbleSilence := gumble.AudioBuffer{}
 	for i := 3; i < 480; i++ {
 		mumbleSilence = append(mumbleSilence, 0x00)
 	}
 	var speakingStart time.Time

-	sleepTick := sleepct.SleepCT{}
-	sleepTick.Start(10 * time.Millisecond)
+	dd.discordReceiveSleepTick.Start(10 * time.Millisecond)

 	sendAudio := false
 	toMumbleStreaming := false
-	wg.Add(1)

 	for {
 		select {
 		case <-ctx.Done():
-			wg.Done()
+			log.Println("Stopping from Discord mixer")
 			return
 		default:
 		}

-		sleepTick.SleepNextTarget()
+		// if didn't send audio try to pause
+		// promTimerDiscordMixer.Observe(float64(dd.discordReceiveSleepTick.SleepNextTarget(ctx, !sendAudio)))
+		// TODO Additional pause testing
+		promTimerDiscordMixer.Observe(float64(dd.discordReceiveSleepTick.SleepNextTarget(ctx, false)))

 		dd.discordMutex.Lock()

 		sendAudio = false
 		internalMixerArr := make([][]int16, 0)
+		streamingCount := 0

 		// Work through each channel
 		for i := range dd.fromDiscordMap {
@ -306,6 +343,7 @@ func (dd *DiscordDuplex) fromDiscordMixer(ctx context.Context, wg *sync.WaitGrou
 					dd.fromDiscordMap[i] = x
 				}

+				streamingCount++
 				x1 := (<-dd.fromDiscordMap[i].pcm)
 				internalMixerArr = append(internalMixerArr, x1)
 			} else {
@ -318,6 +356,9 @@ func (dd *DiscordDuplex) fromDiscordMixer(ctx context.Context, wg *sync.WaitGrou
 			}
 		}

+		promDiscordArraySize.Set(float64(len(dd.fromDiscordMap)))
+		promDiscordStreaming.Set(float64(streamingCount))
+
 		dd.discordMutex.Unlock()

 		mumbleTimeoutSend := func(outBuf []int16) {
@ -329,8 +370,10 @@ func (dd *DiscordDuplex) fromDiscordMixer(ctx context.Context, wg *sync.WaitGrou

 			select {
 			case toMumble <- outBuf:
+				promSentMumblePackets.Inc()
 			case <-timeout:
 				log.Println("To Mumble timeout. Dropping packet")
+				promToMumbleDropped.Inc()
 			}
 		}

@ -354,7 +397,7 @@ func (dd *DiscordDuplex) fromDiscordMixer(ctx context.Context, wg *sync.WaitGrou

 			for i := 0; i < 5; i++ {
 				mumbleTimeoutSend(mumbleSilence)
-				sleepTick.SleepNextTarget()
+				promTimerDiscordMixer.Observe(float64(dd.discordReceiveSleepTick.SleepNextTarget(ctx, false)))
 			}

 			toMumbleStreaming = false
--- a/internal/bridge/mumble-handlers.go
+++ b/internal/bridge/mumble-handlers.go
@ -1,8 +1,10 @@
 package bridge

 import (
+	"fmt"
 	"log"
 	"strings"
+	"time"

 	"github.com/stieneee/gumble/gumble"
 )
@ -12,28 +14,44 @@ type MumbleListener struct {
 	Bridge *BridgeState
 }

+func (l *MumbleListener) updateUsers() {
+	l.Bridge.MumbleUsersMutex.Lock()
+	l.Bridge.MumbleUsers = make(map[string]bool)
+	for _, user := range l.Bridge.MumbleClient.Self.Channel.Users {
+		//note, this might be too slow for really really big channels?
+		//event listeners block while processing
+		//also probably bad to rebuild the set every user change.
+		if user.Name != l.Bridge.MumbleClient.Self.Name {
+			l.Bridge.MumbleUsers[user.Name] = true
+		}
+	}
+	promMumbleUsers.Set(float64(len(l.Bridge.MumbleUsers)))
+	l.Bridge.MumbleUsersMutex.Unlock()
+
+}
+
 func (l *MumbleListener) MumbleConnect(e *gumble.ConnectEvent) {
 	//join specified channel
 	startingChannel := e.Client.Channels.Find(l.Bridge.BridgeConfig.MumbleChannel...)
 	if startingChannel != nil {
 		e.Client.Self.Move(startingChannel)
 	}
+
+	// l.updateUsers() // patch below
+
+	// This is an ugly patch Mumble Client state is slow to update
+	time.AfterFunc(5*time.Second, func() {
+		defer func() {
+			if r := recover(); r != nil {
+				fmt.Printf("Failed to mumble user list %v \n", r)
+			}
+		}()
+		l.updateUsers()
+	})
 }

 func (l *MumbleListener) MumbleUserChange(e *gumble.UserChangeEvent) {
-	l.Bridge.MumbleUsersMutex.Lock()
-	if e.Type.Has(gumble.UserChangeConnected) || e.Type.Has(gumble.UserChangeChannel) || e.Type.Has(gumble.UserChangeDisconnected) {
-		l.Bridge.MumbleUsers = make(map[string]bool)
-		for _, user := range l.Bridge.MumbleClient.Self.Channel.Users {
-			//note, this might be too slow for really really big channels?
-			//event listeners block while processing
-			//also probably bad to rebuild the set every user change.
-			if user.Name != l.Bridge.MumbleClient.Self.Name {
-				l.Bridge.MumbleUsers[user.Name] = true
-			}
-		}
-	}
-	l.Bridge.MumbleUsersMutex.Unlock()
+	l.updateUsers()

 	if e.Type.Has(gumble.UserChangeConnected) {

--- a/internal/bridge/mumble.go
+++ b/internal/bridge/mumble.go
@ -3,6 +3,7 @@ package bridge
 import (
 	"context"
 	"log"
+	"strconv"
 	"sync"
 	"time"

@ -11,23 +12,34 @@ import (
 	"github.com/stieneee/mumble-discord-bridge/pkg/sleepct"
 )

-var mutex sync.Mutex
-var fromMumbleArr []chan gumble.AudioBuffer
-var mumbleStreamingArr []bool
+// MumbleDuplex - listener and outgoing
+type MumbleDuplex struct {
+	mutex              sync.Mutex
+	fromMumbleArr      []chan gumble.AudioBuffer
+	mumbleStreamingArr []bool
+	mumbleSleepTick    sleepct.SleepCT
+}

-// MumbleDuplex - listenera and outgoing
-type MumbleDuplex struct{}
+func NewMumbleDuplex() *MumbleDuplex {
+	return &MumbleDuplex{
+		fromMumbleArr:      make([]chan gumble.AudioBuffer, 0),
+		mumbleStreamingArr: make([]bool, 0),
+		mumbleSleepTick:    sleepct.SleepCT{},
+	}
+}

 // OnAudioStream - Spawn routines to handle incoming packets
-func (m MumbleDuplex) OnAudioStream(e *gumble.AudioStreamEvent) {
+func (m *MumbleDuplex) OnAudioStream(e *gumble.AudioStreamEvent) {

 	// hold a reference ot the channel in the closure
-	localMumbleArray := make(chan gumble.AudioBuffer, 100)
+	streamChan := make(chan gumble.AudioBuffer, 100)

-	mutex.Lock()
-	fromMumbleArr = append(fromMumbleArr, localMumbleArray)
-	mumbleStreamingArr = append(mumbleStreamingArr, false)
-	mutex.Unlock()
+	m.mutex.Lock()
+	m.fromMumbleArr = append(m.fromMumbleArr, streamChan)
+	m.mumbleStreamingArr = append(m.mumbleStreamingArr, false)
+	m.mutex.Unlock()
+
+	promMumbleArraySize.Set(float64(len(m.fromMumbleArr)))

 	go func() {
 		name := e.User.Name
@ -37,57 +49,62 @@ func (m MumbleDuplex) OnAudioStream(e *gumble.AudioStreamEvent) {

 			// 480 per 10ms
 			for i := 0; i < len(p.AudioBuffer)/480; i++ {
-				localMumbleArray <- p.AudioBuffer[480*i : 480*(i+1)]
+				streamChan <- p.AudioBuffer[480*i : 480*(i+1)]
 			}
+			promReceivedMumblePackets.Inc()
+			m.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{}
-	sleepTick.Start(10 * time.Millisecond)
+func (m *MumbleDuplex) fromMumbleMixer(ctx context.Context, cancel context.CancelFunc, toDiscord chan []int16) {
+	m.mumbleSleepTick.Start(10 * time.Millisecond)

 	sendAudio := false
-	bufferWarning := false

-	wg.Add(1)
+	droppingPackets := false
+	droppingPacketCount := 0

 	for {
 		select {
 		case <-ctx.Done():
-			wg.Done()
+			log.Println("Stopping From Mumble Mixer")
 			return
 		default:
 		}

-		sleepTick.SleepNextTarget()
+		promTimerMumbleMixer.Observe(float64(m.mumbleSleepTick.SleepNextTarget(ctx, false)))

-		mutex.Lock()
+		m.mutex.Lock()

 		sendAudio = false
 		internalMixerArr := make([]gumble.AudioBuffer, 0)
+		streamingCount := 0

 		// Work through each channel
-		for i := 0; i < len(fromMumbleArr); i++ {
-			if len(fromMumbleArr[i]) > 0 {
+		for i := 0; i < len(m.fromMumbleArr); i++ {
+			if len(m.fromMumbleArr[i]) > 0 {
 				sendAudio = true
-				if !mumbleStreamingArr[i] {
-					mumbleStreamingArr[i] = true
+				if !m.mumbleStreamingArr[i] {
+					m.mumbleStreamingArr[i] = true
+					streamingCount++
 					// log.Println("Mumble starting", i)
 				}

-				x1 := (<-fromMumbleArr[i])
+				x1 := (<-m.fromMumbleArr[i])
 				internalMixerArr = append(internalMixerArr, x1)
 			} else {
-				if mumbleStreamingArr[i] {
-					mumbleStreamingArr[i] = false
+				if m.mumbleStreamingArr[i] {
+					m.mumbleStreamingArr[i] = false
 					// log.Println("Mumble stopping", i)
 				}
 			}
 		}

-		mutex.Unlock()
+		m.mutex.Unlock()
+
+		promMumbleStreaming.Set(float64(streamingCount))

 		if sendAudio {

@ -99,22 +116,27 @@ func (m MumbleDuplex) fromMumbleMixer(ctx context.Context, wg *sync.WaitGroup, t
 				}
 			}

-			if len(toDiscord) > 20 {
-				if !bufferWarning {
-					log.Println("Warning: toDiscord buffer size")
-					bufferWarning = true
-				}
-			} else {
-				if bufferWarning {
-					log.Println("Resolved: toDiscord buffer size")
-					bufferWarning = false
-				}
-			}
-
+			promToDiscordBufferSize.Set(float64(len(toDiscord)))
 			select {
 			case toDiscord <- outBuf:
+				{
+					if droppingPackets {
+						log.Println("Discord buffer ok, total packets dropped " + strconv.Itoa(droppingPacketCount))
+						droppingPackets = false
+					}
+				}
 			default:
-				log.Println("Error: toDiscord buffer full. Dropping packet")
+				if !droppingPackets {
+					log.Println("Error: toDiscord buffer full. Dropping packets")
+					droppingPackets = true
+					droppingPacketCount = 0
+				}
+				droppingPacketCount++
+				promToDiscordDropped.Inc()
+				if droppingPacketCount > 250 {
+					log.Println("Discord Timeout")
+					cancel()
+				}
 			}
 		}
 	}
--- a/internal/bridge/prom.go
+++ b/internal/bridge/prom.go
@ -0,0 +1,141 @@
+package bridge
+
+import (
+	"log"
+	"net/http"
+	"strconv"
+
+	"github.com/prometheus/client_golang/prometheus"
+	"github.com/prometheus/client_golang/prometheus/promauto"
+	"github.com/prometheus/client_golang/prometheus/promhttp"
+)
+
+var (
+	// Bridge General
+
+	PromApplicationStartTime = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "mdb_bridge_start_time",
+		Help: "The time the application started",
+	})
+
+	promBridgeStarts = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "mdb_bridge_starts_count",
+		Help: "The number of times the bridge start routine has been called",
+	})
+
+	promBridgeStartTime = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "mdb_bridge_starts_time",
+		Help: "The time the current bridge instance started",
+	})
+
+	// MUMBLE
+	promMumblePing = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "mdb_mumble_ping",
+		Help: "Mumble ping",
+	})
+
+	promMumbleUsers = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "mdb_mumble_users_gauge",
+		Help: "The number of connected Mumble users",
+	})
+
+	promReceivedMumblePackets = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "mdb_mumble_received_count",
+		Help: "The count of Mumble audio packets received",
+	})
+
+	promSentMumblePackets = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "mdb_mumble_sent_count",
+		Help: "The count of audio packets sent to mumble",
+	})
+
+	// promToMumbleBufferSize = promauto.NewGauge(prometheus.GaugeOpts{
+	// 	Name: "mdb_to_mumble_buffer_gauge",
+	// 	Help: "",
+	// })
+
+	promToMumbleDropped = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "mdb_to_mumble_dropped",
+		Help: "The number of packets timeouts to mumble",
+	})
+
+	promMumbleArraySize = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "mdb_to_mumble_array_size_gauge",
+		Help: "The array size of mumble streams",
+	})
+
+	promMumbleStreaming = promauto.NewGauge(prometheus.GaugeOpts{ //SUMMARY?
+		Name: "mdb_mumble_streaming_gauge",
+		Help: "The number of active audio streams streaming audio from mumble",
+	})
+
+	// DISCORD
+
+	// TODO Discrod Ping
+
+	promDiscordHeartBeat = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "mdb_discord_latency",
+		Help: "Discord heartbeat latency",
+	})
+
+	promDiscordUsers = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "mdb_discord_users_gauge",
+		Help: "The number of Connected Discord users",
+	})
+
+	promDiscordReceivedPackets = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "mdb_discord_received_count",
+		Help: "The number of received packets from Discord",
+	})
+
+	promDiscordSentPackets = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "mdb_discord_sent_count",
+		Help: "The number of packets sent to Discord",
+	})
+
+	promToDiscordBufferSize = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "mdb_discord_buffer_gauge",
+		Help: "The buffer size for packets to Discord",
+	})
+
+	promToDiscordDropped = promauto.NewCounter(prometheus.CounterOpts{
+		Name: "mdb_to_discord_dropped",
+		Help: "The count of packets dropped to discord",
+	})
+
+	promDiscordArraySize = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "mdb_discord_array_size_gauge",
+		Help: "The discord receiving array size",
+	})
+
+	promDiscordStreaming = promauto.NewGauge(prometheus.GaugeOpts{
+		Name: "mdb_discord_streaming_gauge",
+		Help: "The number of active audio streams streaming from discord",
+	})
+
+	// Sleep Timer Performance
+
+	promTimerDiscordSend = promauto.NewHistogram(prometheus.HistogramOpts{
+		Name:    "mdb_timer_discord_send",
+		Help:    "Timer performance for Discord send",
+		Buckets: []float64{1000, 2000, 5000, 10000, 20000},
+	})
+
+	promTimerDiscordMixer = promauto.NewHistogram(prometheus.HistogramOpts{
+		Name:    "mdb_timer_discord_mixer",
+		Help:    "Timer performance for the Discord mixer",
+		Buckets: []float64{1000, 2000, 5000, 10000, 20000},
+	})
+
+	promTimerMumbleMixer = promauto.NewHistogram(prometheus.HistogramOpts{
+		Name:    "mdb_timer_mumble_mixer",
+		Help:    "Timer performance for the Mumble mixer",
+		Buckets: []float64{1000, 2000, 5000, 10000, 20000},
+	})
+)
+
+func StartPromServer(port int) {
+	log.Println("Starting Metrics Server")
+	http.Handle("/metrics", promhttp.Handler())
+	http.ListenAndServe(":"+strconv.Itoa(port), nil)
+}
--- a/pkg/sleepct/sleepct.go
+++ b/pkg/sleepct/sleepct.go
@ -1,20 +1,25 @@
 package sleepct

 import (
+	"context"
 	"fmt"
-	"sync"
 	"time"
 )

-// SleepCT - Sleep constant time step crates a sleep based ticker
-// designed maintain a sleep/tick interval
+// SleepCT - Sleep constant time step crates a sleep based ticker.
+// 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 {
-	sync.Mutex
-	d time.Duration // duration
-	t time.Time     // last time target
+	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, 2)
 	if s.t.IsZero() {
 		s.d = d
 		s.t = time.Now()
@ -23,28 +28,65 @@ func (s *SleepCT) Start(d time.Duration) {
 	}
 }

-func (s *SleepCT) SleepNextTarget() {
-	s.Lock()
+// Sleep to the next target 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(ctx context.Context, pause bool) int64 {

 	now := time.Now()

-	var last time.Time
+	// if target is zero safety net
 	if s.t.IsZero() {
 		fmt.Println("SleepCT reset")
-		last = now.Add(-s.d)
-	} else {
-		last = s.t
+		s.t = now.Add(-s.d)
 	}

-	// Next Target
-	s.t = last.Add(s.d)
+	// Sleep to Next Target
+	s.t = s.t.Add(s.d)

-	d := s.t.Sub(now)
+	// Compute the desired sleep time to reach the target
+	d := time.Until(s.t)

+	// Sleep
 	time.Sleep(d)

-	// delta := now.Sub(s.t)
-	// fmt.Println("delta", delta, d, time.Since(s.t))
+	// record the wake time
+	s.wake = time.Now()
+	s.drift = s.wake.Sub(s.t).Microseconds()

-	s.Unlock()
+	// fmt.Println(s.t.UnixMilli(), d.Milliseconds(), wake.UnixMilli(), drift, pause, len(s.resume))
+
+	// external pause control
+	if pause {
+		// don't pause if the notification channel has something
+		if len(s.resume) == 0 {
+			// 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
+			s.t = time.Now()
+		}
+	}
+
+	// Drain the resume channel
+	select {
+	case <-s.resume:
+	default:
+	}
+
+	// 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() {
+	select {
+	case s.resume <- true:
+	default:
+	}
 }
--- a/test/timing_test.go
+++ b/test/timing_test.go
@ -1,6 +1,7 @@
 package main

 import (
+	"context"
 	"fmt"
 	"math"
 	"math/rand"
@ -18,7 +19,7 @@ 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))

-func testTickerBaseCase(wg *sync.WaitGroup) {
+func testTickerBaseCase(wg *sync.WaitGroup, test *testing.T) {
 	wg.Add(1)
 	go func(interval time.Duration) {
 		now := time.Now()
@ -39,7 +40,7 @@ func testTickerBaseCase(wg *sync.WaitGroup) {
 func TestTickerBaseCase(t *testing.T) {
 	wg := sync.WaitGroup{}

-	testTickerBaseCase(&wg)
+	testTickerBaseCase(&wg, t)

 	wg.Wait()
 }
@ -115,7 +116,7 @@ func testSleepCT(wg *sync.WaitGroup) {
 			if i+1 < testCount {
 				time.Sleep(time.Duration(float64(maxSleepInterval) * rand.Float64()))
 			}
-			s.SleepNextTarget()
+			s.SleepNextTarget(context.TODO(), false)
 		}
 		fmt.Println("SleepCT (loaded) after", testDuration, "drifts", time.Since(start)-testDuration)
 		wg.Done()
@ -130,6 +131,35 @@ func TestSleepCT(t *testing.T) {
 	wg.Wait()
 }

+func testSleepCTPause(wg *sync.WaitGroup) {
+	wg.Add(1)
+	go func(interval time.Duration) {
+		now := time.Now()
+		start := now
+		// start the ticker
+		s := sleepct.SleepCT{}
+		s.Start(interval)
+		var i int64
+		for i = 0; i < testCount; i++ {
+			if i+1 < testCount {
+				time.Sleep(time.Duration(float64(maxSleepInterval) * rand.Float64()))
+			}
+			s.Notify()
+			s.SleepNextTarget(context.TODO(), true)
+		}
+		fmt.Println("SleepCT Pause (loaded) after", testDuration, "drifts", time.Since(start)-testDuration)
+		wg.Done()
+	}(tickerInterval)
+}
+
+func TestSleepCTPause(t *testing.T) {
+	wg := sync.WaitGroup{}
+
+	testSleepCTPause(&wg)
+
+	wg.Wait()
+}
+
 func TestIdleJitter(t *testing.T) {
 	wg := sync.WaitGroup{}