Initial commit

pulseaudio.go

@@ -0,0 +1,102 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"os/exec"
+
+	p "github.com/mafik/pulseaudio"
+)
+
+var SoundVolume = "🔊:0%"
+var pa *p.Client
+
+// UpdateVolumeInfo updates info about current Sound Volume.
+func UpdateVolumeInfo() {
+	var err error
+
+	pa, err = p.NewClient()
+
+	// It can happen if no pulseaudio server running for current user.
+	// If no server running we have to run one.
+	if err != nil {
+		if err := PaReinit(); err != nil {
+			log.Print(err)
+
+			return
+		}
+	}
+
+	vol, err := pa.Volume()
+
+	if err != nil {
+		log.Printf("Unable get volume from pulseaudio server: %s", err)
+
+		return
+	}
+
+	SoundVolume = fmt.Sprintf("%s:%d%%", Conf.SimpleVolumePa.Symbol, int64(vol*100))
+
+	UpdateReady <- true
+
+	for {
+		// Subscribe to update notification channel, to get info that volume changed
+		pulseUpdate, err := pa.Updates()
+
+		if err != nil {
+			log.Printf("Unable to subscribe to pulseaudio updates: %s", err)
+
+			return
+		}
+
+		// Rake update events
+		for range pulseUpdate {
+			vol, err = pa.Volume()
+
+			if err != nil {
+				log.Printf("Unable get volume from pulseaudio server: %s", err)
+
+				return
+			}
+
+			SoundVolume = fmt.Sprintf("%s:%d%%", Conf.SimpleVolumePa.Symbol, int64(vol*100))
+
+			UpdateReady <- true
+		}
+
+		if err := PaReinit(); err != nil {
+			log.Print(err)
+
+			return
+		}
+	}
+
+	// This code is unreachable :(
+	pa.Close()
+}
+
+// PaReinit re-inits pulseaudio and connection to it.
+func PaReinit() error {
+	var err error
+
+	// If we out of updates, it seems that someone killed pulseaudio server. Restart it.
+	cmd := exec.Command("pulseaudio", "--check")
+
+	if err := cmd.Run(); err == nil {
+		return fmt.Errorf("pulseaudio is already running, but we have troubles contacting it: %w", err)
+	}
+
+	cmd = exec.Command("pulseaudio", "--start")
+
+	if err := cmd.Run(); err != nil {
+		return fmt.Errorf("unable to initialize pulseaudio server instance: %w", err)
+	} //nolint:wsl
+
+	pa, err = p.NewClient()
+
+	if err != nil {
+		return fmt.Errorf("unable to make client connection to pulseaudio: %s", err)
+	} //nolint:wsl
+
+	return err
+}