layer1: share namespace watcher event handlers

pkg/utils/namespace_manager.go

@@ -9,6 +9,7 @@ import (
 
 	"go.uber.org/zap"
 	corev1 "k8s.io/api/core/v1"
+	k8sCache "k8s.io/client-go/tools/cache"
 )
 
 type NamespaceSubscriber interface {
@@ -185,6 +186,27 @@ func HandleWatcherNamespaceRemoval(ctx context.Context, logger *zap.Logger, comp
 		zap.String("namespace", record.Name))
 }
 
+func NewNamespaceWatcherEventHandlers(ctx context.Context, logger *zap.Logger, component string, manager NamespaceManager, strategy NamespaceRemovalStrategy) k8sCache.ResourceEventHandlerFuncs {
+	return k8sCache.ResourceEventHandlerFuncs{
+		AddFunc: func(obj interface{}) {
+			namespace, ok := obj.(*corev1.Namespace)
+			if ok {
+				HandleWatcherNamespaceAdd(ctx, logger, component, manager, namespace)
+			}
+		},
+		UpdateFunc: func(oldObj, newObj interface{}) {
+			oldNamespace, _ := oldObj.(*corev1.Namespace)
+			newNamespace, ok := newObj.(*corev1.Namespace)
+			if ok {
+				HandleWatcherNamespaceUpdate(ctx, logger, component, manager, oldNamespace, newNamespace, strategy)
+			}
+		},
+		DeleteFunc: func(obj interface{}) {
+			HandleWatcherNamespaceDelete(ctx, logger, component, manager, obj, strategy)
+		},
+	}
+}
+
 func (m *inMemoryNamespaceManager) Subscribe(subscriber NamespaceSubscriber) {
 	m.mu.Lock()
 	defer m.mu.Unlock()