fix bug

pkg/lifecycle/loop_runner.go

@@ -0,0 +1,60 @@
+package lifecycle
+
+import "sync"
+
+// LoopRunner provides a reusable start/stop lifecycle for background loops.
+// It guarantees idempotent start/stop and waits for loop exit on stop.
+type LoopRunner struct {
+	mu      sync.RWMutex
+	wg      sync.WaitGroup
+	running bool
+	stopCh  chan struct{}
+}
+
+func NewLoopRunner() *LoopRunner {
+	return &LoopRunner{}
+}
+
+func (r *LoopRunner) Start(loop func(stop <-chan struct{})) bool {
+	if loop == nil {
+		return false
+	}
+
+	r.mu.Lock()
+	defer r.mu.Unlock()
+	if r.running {
+		return false
+	}
+
+	stopCh := make(chan struct{})
+	r.stopCh = stopCh
+	r.running = true
+	r.wg.Add(1)
+	go func() {
+		defer r.wg.Done()
+		loop(stopCh)
+	}()
+	return true
+}
+
+func (r *LoopRunner) Stop() bool {
+	r.mu.Lock()
+	if !r.running {
+		r.mu.Unlock()
+		return false
+	}
+	stopCh := r.stopCh
+	r.stopCh = nil
+	r.running = false
+	close(stopCh)
+	r.mu.Unlock()
+
+	r.wg.Wait()
+	return true
+}
+
+func (r *LoopRunner) Running() bool {
+	r.mu.RLock()
+	defer r.mu.RUnlock()
+	return r.running
+}