initial commit

2026-04-07 23:46:35 +03:00
commit cdbd8abaa4
13 changed files with 681 additions and 0 deletions
--- a/monitor/monitor.go
+++ b/monitor/monitor.go
@@ -0,0 +1,146 @@
+package monitor
+
+import (
+	"context"
+	"log"
+
+	"github.com/godbus/dbus/v5"
+
+	"led-controller/config"
+)
+
+type Event int
+
+const (
+	DisplayOn Event = iota
+	DisplayOff
+)
+
+type Monitor struct {
+	cfg    *config.Config
+	events chan<- Event
+}
+
+func New(cfg *config.Config, events chan<- Event) (*Monitor, error) {
+	return &Monitor{cfg: cfg, events: events}, nil
+}
+
+func (m *Monitor) Run(ctx context.Context) {
+	method := m.cfg.Monitor.Method
+
+	if method == "screensaver" || method == "all" {
+		go m.watchScreenSaver(ctx)
+	}
+	if method == "logind" || method == "all" {
+		go m.watchLogind(ctx)
+	}
+
+	<-ctx.Done()
+}
+
+// watchScreenSaver listens on the session bus for org.freedesktop.ScreenSaver.ActiveChanged
+// This covers GNOME, KDE, XFCE, and other freedesktop-compliant DEs.
+func (m *Monitor) watchScreenSaver(ctx context.Context) {
+	conn, err := dbus.ConnectSessionBus()
+	if err != nil {
+		log.Printf("screensaver monitor: cannot connect to session bus: %v", err)
+		return
+	}
+	defer conn.Close()
+
+	// Match both the freedesktop and GNOME screensaver interfaces
+	rules := []string{
+		"type='signal',interface='org.freedesktop.ScreenSaver',member='ActiveChanged'",
+		"type='signal',interface='org.gnome.ScreenSaver',member='ActiveChanged'",
+	}
+
+	for _, rule := range rules {
+		call := conn.BusObject().Call("org.freedesktop.DBus.AddMatch", 0, rule)
+		if call.Err != nil {
+			log.Printf("screensaver monitor: AddMatch failed for %q: %v", rule, call.Err)
+		}
+	}
+
+	sigCh := make(chan *dbus.Signal, 16)
+	conn.Signal(sigCh)
+
+	log.Println("screensaver monitor: listening for ActiveChanged signals")
+
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case sig := <-sigCh:
+			if sig == nil {
+				return
+			}
+			if sig.Name == "org.freedesktop.ScreenSaver.ActiveChanged" ||
+				sig.Name == "org.gnome.ScreenSaver.ActiveChanged" {
+				if len(sig.Body) < 1 {
+					continue
+				}
+				active, ok := sig.Body[0].(bool)
+				if !ok {
+					continue
+				}
+				if active {
+					log.Println("screensaver monitor: screen locked/blanked")
+					m.events <- DisplayOff
+				} else {
+					log.Println("screensaver monitor: screen unlocked/unblanked")
+					m.events <- DisplayOn
+				}
+			}
+		}
+	}
+}
+
+// watchLogind listens on the system bus for org.freedesktop.login1.Manager.PrepareForSleep.
+// This catches system suspend/resume events.
+func (m *Monitor) watchLogind(ctx context.Context) {
+	conn, err := dbus.ConnectSystemBus()
+	if err != nil {
+		log.Printf("logind monitor: cannot connect to system bus: %v", err)
+		return
+	}
+	defer conn.Close()
+
+	rule := "type='signal',interface='org.freedesktop.login1.Manager',member='PrepareForSleep'"
+	call := conn.BusObject().Call("org.freedesktop.DBus.AddMatch", 0, rule)
+	if call.Err != nil {
+		log.Printf("logind monitor: AddMatch failed: %v", call.Err)
+		return
+	}
+
+	sigCh := make(chan *dbus.Signal, 16)
+	conn.Signal(sigCh)
+
+	log.Println("logind monitor: listening for PrepareForSleep signals")
+
+	for {
+		select {
+		case <-ctx.Done():
+			return
+		case sig := <-sigCh:
+			if sig == nil {
+				return
+			}
+			if sig.Name == "org.freedesktop.login1.Manager.PrepareForSleep" {
+				if len(sig.Body) < 1 {
+					continue
+				}
+				preparing, ok := sig.Body[0].(bool)
+				if !ok {
+					continue
+				}
+				if preparing {
+					log.Println("logind monitor: system preparing to sleep")
+					m.events <- DisplayOff
+				} else {
+					log.Println("logind monitor: system woke up")
+					m.events <- DisplayOn
+				}
+			}
+		}
+	}
+}