layer1: share namespace watcher lifecycle helpers

pkg/utils/namespace_manager.go

@@ -6,6 +6,8 @@ import (
 	"sort"
 	"sync"
 	"time"
+
+	corev1 "k8s.io/api/core/v1"
 )
 
 type NamespaceSubscriber interface {
@@ -100,6 +102,41 @@ func NewWatcherNamespaceManager(ctx context.Context, namespaces []string, source
 	return manager, err
 }
 
+func NamespaceBecameUnmanaged(oldNamespace *corev1.Namespace, newNamespace *corev1.Namespace) bool {
+	if oldNamespace == nil || newNamespace == nil {
+		return false
+	}
+	return IsManagedNamespace(oldNamespace.Labels) && !IsManagedNamespace(newNamespace.Labels)
+}
+
+func DispatchNamespaceAdd(ctx context.Context, manager NamespaceManager, namespace *corev1.Namespace, source NamespaceSource, observedAt time.Time) (NamespaceRecord, bool, error) {
+	if manager == nil || namespace == nil || namespace.Name == "" {
+		return NamespaceRecord{}, false, nil
+	}
+	manager.Upsert(NamespaceEventFromNamespace(NamespaceEventAdd, namespace, source, observedAt))
+	return manager.DispatchAdd(ctx, namespace.Name)
+}
+
+func DispatchNamespaceResync(ctx context.Context, manager NamespaceManager, namespace *corev1.Namespace, source NamespaceSource, observedAt time.Time) (NamespaceRecord, bool, error) {
+	if manager == nil || namespace == nil || namespace.Name == "" {
+		return NamespaceRecord{}, false, nil
+	}
+	manager.Upsert(NamespaceEventFromNamespace(NamespaceEventUpdate, namespace, source, observedAt))
+	return manager.DispatchResync(ctx, namespace.Name)
+}
+
+func RecordNamespaceRemoval(manager NamespaceManager, obj interface{}, source NamespaceSource, observedAt time.Time) (NamespaceRecord, bool) {
+	if manager == nil {
+		return NamespaceRecord{}, false
+	}
+	event := NamespaceEventFromObject(NamespaceEventRemove, obj, source, observedAt)
+	if event.Name == "" {
+		return NamespaceRecord{}, false
+	}
+	record := manager.Upsert(event)
+	return record, true
+}
+
 func (m *inMemoryNamespaceManager) Subscribe(subscriber NamespaceSubscriber) {
 	m.mu.Lock()
 	defer m.mu.Unlock()