Add debouncer

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/ad57eef4ef0659193044870c731987a6df5cf56b' (2024-05-29)
  → 'github:NixOS/nixpkgs/30439d93eb8b19861ccbe3e581abf97bdc91b093' (2024-09-23)

.gitignore

@@ -0,0 +1 @@
+result

debouncer/debouncer.go

@@ -0,0 +1,53 @@
+package debouncer
+
+import "time"
+
+type Debouncer struct {
+	input <-chan bool
+	C     <-chan bool
+}
+
+func New(ch <-chan bool) *Debouncer {
+	output := make(chan bool)
+	var currentState bool
+	var lastState bool
+	falseTimer := time.NewTimer(0)
+	falseTimer.Stop()
+	go func() {
+		for {
+			select {
+			case <-falseTimer.C:
+				if !currentState && lastState {
+					output <- false
+					lastState = false
+				} else {
+					falseTimer.Reset(200 * time.Millisecond)
+				}
+			case v, ok := <-ch:
+				if !ok {
+					falseTimer.Reset(200 * time.Millisecond)
+					<-falseTimer.C
+					output <- false
+					close(output)
+					return
+				}
+				if v {
+					if !lastState {
+						output <- true
+						lastState = true
+						falseTimer.Reset(200 * time.Millisecond)
+					}
+
+					currentState = true
+				} else {
+					falseTimer.Reset(200 * time.Millisecond)
+
+					currentState = false
+				}
+			}
+		}
+	}()
+	d := &Debouncer{input: ch, C: output}
+
+	return d
+}

debouncer/debouncer_test.go

@@ -0,0 +1,89 @@
+package debouncer_test
+
+import (
+	"testing"
+	"time"
+
+	"git.t-juice.club/torjus/ghettoptt/debouncer"
+)
+
+func TestDebouncer(t *testing.T) {
+	t.Run("Simple", func(t *testing.T) {
+		ch := make(chan bool)
+		d := debouncer.New(ch)
+
+		go func() {
+			ch <- true
+			close(ch)
+		}()
+
+		if v := <-d.C; v != true {
+			t.Errorf("Expected true, got %v", v)
+		}
+	})
+	t.Run("TrueTrueTrueFalse", func(t *testing.T) {
+		ch := make(chan bool)
+		d := debouncer.New(ch)
+		go func() {
+			ch <- true
+			ch <- true
+			ch <- true
+			ch <- false
+			close(ch)
+		}()
+		if v := <-d.C; v != true {
+			t.Errorf("Expected true, got %v", v)
+		}
+		if v := <-d.C; v != false {
+			t.Errorf("Expected false, got %v", v)
+		}
+	})
+	t.Run("Debounce", func(t *testing.T) {
+		ch := make(chan bool)
+		d := debouncer.New(ch)
+		go func() {
+			ch <- true
+			time.Sleep(10 * time.Millisecond)
+			ch <- false
+			time.Sleep(1 * time.Millisecond)
+			ch <- true
+			time.Sleep(1 * time.Millisecond)
+			ch <- false
+			time.Sleep(10 * time.Millisecond)
+			close(ch)
+		}()
+		if v := <-d.C; v != true {
+			t.Errorf("Expected first value to be true, got %v", v)
+		}
+		if v := <-d.C; v != false {
+			t.Errorf("Expected second value to be false, got %v", v)
+		}
+
+		if v, ok := <-d.C; ok {
+			t.Errorf("Expected closed channel, got %v", v)
+		}
+	})
+	t.Run("DebounceDelay", func(t *testing.T) {
+		ch := make(chan bool)
+		d := debouncer.New(ch)
+		go func() {
+			ch <- true
+			ch <- false
+			close(ch)
+		}()
+		start := time.Now()
+		if v := <-d.C; v != true {
+			t.Errorf("Expected first value to be true, got %v", v)
+		}
+		if v, ok := <-d.C; v != false || !ok {
+			if ok {
+				t.Errorf("Expected second value to be false, got %v", v)
+			} else {
+				t.Error("Unexpected closed channel")
+			}
+		}
+		if duration := time.Since(start); duration < 200*time.Millisecond {
+			t.Errorf("Got false too soon: %s", duration)
+		}
+	})
+}

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1716948383,
-        "narHash": "sha256-SzDKxseEcHR5KzPXLwsemyTR/kaM9whxeiJohbL04rs=",
+        "lastModified": 1727122398,
+        "narHash": "sha256-o8VBeCWHBxGd4kVMceIayf5GApqTavJbTa44Xcg5Rrk=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "ad57eef4ef0659193044870c731987a6df5cf56b",
+        "rev": "30439d93eb8b19861ccbe3e581abf97bdc91b093",
         "type": "github"
       },
       "original": {

flake.nix

@@ -3,7 +3,8 @@
 
   inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
 
-  outputs = { self, nixpkgs }:
+  outputs =
+    { self, nixpkgs }:
     let
       allSystems = [
         "x86_64-linux"
@@ -11,28 +12,55 @@
         "x86_64-darwin"
         "aarch64-darwin"
       ];
-      forAllSystems = f: nixpkgs.lib.genAttrs allSystems (system: f {
-        pkgs = import nixpkgs { inherit system; };
-      });
+      forAllSystems =
+        f:
+        nixpkgs.lib.genAttrs allSystems (
+          system:
+          f {
+            pkgs = import nixpkgs { inherit system; };
+          }
+        );
     in
     {
       overlays.default = final: prev: {
         ghettoptt = self.packages.${prev.system}.default;
       };
 
-      packages = forAllSystems ({ pkgs }: {
-        default = pkgs.buildGoModule {
-          name = "ghettoptt";
-          src = ./.;
-          vendorHash = "sha256-WhlifAFIqoBNhBWGmYgHc5DWmdhHnK/2kYbEF/DOclw=";
-        };
-      });
-      devShells = forAllSystems ({ pkgs }: {
-        default = pkgs.mkShell {
-          packages = with pkgs; [
-            go
-          ];
-        };
-      });
+      packages = forAllSystems (
+        { pkgs }:
+        {
+          default =
+            let
+              src = pkgs.lib.sourceFilesBySuffices ./. [
+                "go.mod"
+                "go.sum"
+                ".go"
+              ];
+              version = pkgs.lib.strings.removePrefix "v" (
+                builtins.elemAt (pkgs.lib.strings.split "\"" (
+                  pkgs.lib.lists.findFirst (x: pkgs.lib.strings.hasInfix "Version" x) null (
+                    pkgs.lib.strings.splitString "\n" (builtins.readFile ./main.go)
+                  )
+                )) 2
+              );
+            in
+            pkgs.buildGoModule {
+              version = version;
+              name = "ghettoptt";
+              src = src;
+              vendorHash = "sha256-7K0LFYHJ1NBEL7lRCqsKcWpCJY0btRv9eUhyRN9U7/I=";
+            };
+        }
+      );
+      devShells = forAllSystems (
+        { pkgs }:
+        {
+          default = pkgs.mkShell {
+            packages = with pkgs; [
+              go
+            ];
+          };
+        }
+      );
     };
 }

go.mod

@@ -5,15 +5,17 @@ go 1.21.6
 require (
 	github.com/godbus/dbus/v5 v5.1.0
 	github.com/holoplot/go-evdev v0.0.0-20240306072622-217e18f17db1
-	github.com/prometheus/client_golang v1.19.0
+	github.com/prometheus/client_golang v1.20.4
 )
 
 require (
 	github.com/beorn7/perks v1.0.1 // indirect
-	github.com/cespare/xxhash/v2 v2.2.0 // indirect
-	github.com/prometheus/client_model v0.5.0 // indirect
-	github.com/prometheus/common v0.48.0 // indirect
-	github.com/prometheus/procfs v0.12.0 // indirect
-	golang.org/x/sys v0.16.0 // indirect
-	google.golang.org/protobuf v1.32.0 // indirect
+	github.com/cespare/xxhash/v2 v2.3.0 // indirect
+	github.com/klauspost/compress v1.17.10 // indirect
+	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
+	github.com/prometheus/client_model v0.6.1 // indirect
+	github.com/prometheus/common v0.59.1 // indirect
+	github.com/prometheus/procfs v0.15.1 // indirect
+	golang.org/x/sys v0.25.0 // indirect
+	google.golang.org/protobuf v1.34.2 // indirect
 )

go.sum

@@ -2,6 +2,8 @@ github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
 github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
 github.com/cespare/xxhash/v2 v2.2.0 h1:DC2CZ1Ep5Y4k3ZQ899DldepgrayRUGE6BBZ/cd9Cj44=
 github.com/cespare/xxhash/v2 v2.2.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
+github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
+github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/godbus/dbus/v5 v5.1.0 h1:4KLkAxT3aOY8Li4FRJe/KvhoNFFxo0m6fNuFUO8QJUk=
@@ -10,15 +12,31 @@ github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
 github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
 github.com/holoplot/go-evdev v0.0.0-20240306072622-217e18f17db1 h1:92OsBIf5KB1Tatx+uUGOhah73jyNUrt7DmfDRXXJ5Xo=
 github.com/holoplot/go-evdev v0.0.0-20240306072622-217e18f17db1/go.mod h1:iHAf8OIncO2gcQ8XOjS7CMJ2aPbX2Bs0wl5pZyanEqk=
+github.com/klauspost/compress v1.17.10 h1:oXAz+Vh0PMUvJczoi+flxpnBEPxoER1IaAnU/NMPtT0=
+github.com/klauspost/compress v1.17.10/go.mod h1:pMDklpSncoRMuLFrf1W9Ss9KT+0rH90U12bZKk7uwG0=
+github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 h1:C3w9PqII01/Oq1c1nUAm88MOHcQC9l5mIlSMApZMrHA=
+github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822/go.mod h1:+n7T8mK8HuQTcFwEeznm/DIxMOiR9yIdICNftLE1DvQ=
 github.com/prometheus/client_golang v1.19.0 h1:ygXvpU1AoN1MhdzckN+PyD9QJOSD4x7kmXYlnfbA6JU=
 github.com/prometheus/client_golang v1.19.0/go.mod h1:ZRM9uEAypZakd+q/x7+gmsvXdURP+DABIEIjnmDdp+k=
+github.com/prometheus/client_golang v1.20.4 h1:Tgh3Yr67PaOv/uTqloMsCEdeuFTatm5zIq5+qNN23vI=
+github.com/prometheus/client_golang v1.20.4/go.mod h1:PIEt8X02hGcP8JWbeHyeZ53Y/jReSnHgO035n//V5WE=
 github.com/prometheus/client_model v0.5.0 h1:VQw1hfvPvk3Uv6Qf29VrPF32JB6rtbgI6cYPYQjL0Qw=
 github.com/prometheus/client_model v0.5.0/go.mod h1:dTiFglRmd66nLR9Pv9f0mZi7B7fk5Pm3gvsjB5tr+kI=
+github.com/prometheus/client_model v0.6.1 h1:ZKSh/rekM+n3CeS952MLRAdFwIKqeY8b62p8ais2e9E=
+github.com/prometheus/client_model v0.6.1/go.mod h1:OrxVMOVHjw3lKMa8+x6HeMGkHMQyHDk9E3jmP2AmGiY=
 github.com/prometheus/common v0.48.0 h1:QO8U2CdOzSn1BBsmXJXduaaW+dY/5QLjfB8svtSzKKE=
 github.com/prometheus/common v0.48.0/go.mod h1:0/KsvlIEfPQCQ5I2iNSAWKPZziNCvRs5EC6ILDTlAPc=
+github.com/prometheus/common v0.59.1 h1:LXb1quJHWm1P6wq/U824uxYi4Sg0oGvNeUm1z5dJoX0=
+github.com/prometheus/common v0.59.1/go.mod h1:GpWM7dewqmVYcd7SmRaiWVe9SSqjf0UrwnYnpEZNuT0=
 github.com/prometheus/procfs v0.12.0 h1:jluTpSng7V9hY0O2R9DzzJHYb2xULk9VTR1V1R/k6Bo=
 github.com/prometheus/procfs v0.12.0/go.mod h1:pcuDEFsWDnvcgNzo4EEweacyhjeA9Zk3cnaOZAZEfOo=
+github.com/prometheus/procfs v0.15.1 h1:YagwOFzUgYfKKHX6Dr+sHT7km/hxC76UB0learggepc=
+github.com/prometheus/procfs v0.15.1/go.mod h1:fB45yRUv8NstnjriLhBQLuOUt+WW4BsoGhij/e3PBqk=
 golang.org/x/sys v0.16.0 h1:xWw16ngr6ZMtmxDyKyIgsE93KNKz5HKmMa3b8ALHidU=
 golang.org/x/sys v0.16.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
+golang.org/x/sys v0.25.0 h1:r+8e+loiHxRqhXVl6ML1nO3l1+oFoWbnlu2Ehimmi34=
+golang.org/x/sys v0.25.0/go.mod h1:/VUhepiaJMQUp4+oa/7Zr1D23ma6VTLIYjOOTFZPUcA=
 google.golang.org/protobuf v1.32.0 h1:pPC6BG5ex8PDFnkbrGU3EixyhKcQ2aDuBS36lqK/C7I=
 google.golang.org/protobuf v1.32.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
+google.golang.org/protobuf v1.34.2 h1:6xV6lTsCfpGD21XK49h7MhtcApnLqkfYgPcdHftf6hg=
+google.golang.org/protobuf v1.34.2/go.mod h1:qYOHts0dSfpeUzUFpOMr/WGzszTmLH+DiWniOlNbLDw=

main.go

@@ -9,12 +9,13 @@ import (
 	"os/signal"
 
 	"git.t-juice.club/torjus/ghettoptt/bus"
+	"git.t-juice.club/torjus/ghettoptt/debouncer"
 	"git.t-juice.club/torjus/ghettoptt/metrics"
 	"github.com/holoplot/go-evdev"
 	"github.com/prometheus/client_golang/prometheus/promhttp"
 )
 
-const Version = "v0.1.2"
+const Version = "v0.1.3"
 
 func main() {
 	// Setup logger
@@ -71,24 +72,48 @@ func main() {
 
 	// Start listening for PTT key
 	slog.Info("Starting event listener", "version", Version)
-	for !done {
-		ev, err := input.ReadOne()
-		if err != nil {
-			if errors.Is(err, os.ErrClosed) {
-				continue
+	eventCh := make(chan bool)
+	doneCtx, doneCancel := context.WithCancel(srvCtx)
+	defer doneCancel()
+
+	debouncer := debouncer.New(eventCh)
+	go func() {
+		var done bool
+		for !done {
+			ev, err := input.ReadOne()
+			if err != nil {
+				if errors.Is(err, os.ErrClosed) {
+					continue
+				}
+				slog.Error("Error reading from input device", "error", err)
+				mbus.StopTalking()
+				os.Exit(1)
+			}
+			if ev.Code == evdev.KEY_F24 && ev.Value == 1 {
+				slog.Debug("PTT ON")
+				eventCh <- true
+			}
+			if ev.Code == evdev.KEY_F24 && ev.Value == 0 {
+				slog.Debug("PTT OFF")
+				eventCh <- false
+			}
+			if doneCtx.Err() != nil {
+				close(eventCh)
+				done = true
 			}
-			slog.Error("Error reading from input device", "error", err)
-			os.Exit(1)
 		}
-		if ev.Code == evdev.KEY_F24 && ev.Value == 1 {
-			slog.Info("PTT ON")
+	}()
+
+	for v := range debouncer.C {
+		if v {
 			mbus.StartTalking()
-		}
-		if ev.Code == evdev.KEY_F24 && ev.Value == 0 {
-			slog.Info("PTT OFF")
+			slog.Info("Started talking")
+		} else {
 			mbus.StopTalking()
+			slog.Info("Stopped talking")
 		}
 	}
+
 	mbus.StopTalking()
 	<-srvCtx.Done()
 	slog.Info("Exiting")