controller: added finalizer processing

app/control/svccont.go

@@ -127,7 +127,11 @@ func (cont *Controller) addService(obj any) {
 			}
 		}
 		cont.log.Debugf("Service %s/%s forwarded", service.Namespace, service.Name)
-		err := cont.patchService(service)
+		err := cont.addStatus(service)
+		if err != nil {
+			cont.log.Debugf("Error patch service %s/%s: %v", service.Namespace, service.Name, err)
+		}
+		err = cont.addFinalizer(service)
 		if err != nil {
 			cont.log.Debugf("Error patch service %s/%s: %v", service.Namespace, service.Name, err)
 		}
@@ -151,7 +155,7 @@ func (cont *Controller) updateService(oldObj, newObj any) {
 					return
 				}
 			}
-			err := cont.patchService(newService)
+			err := cont.addStatus(newService)
 			if err != nil {
 				cont.log.Errorf("Error patch service %s/%s: %v", newService.Namespace, newService.Name, err)
 			}
@@ -171,6 +175,10 @@ func (cont *Controller) deleteService(obj any) {
 				cont.log.Errorf("Error unforwarding service %s/%s: %v", service.Namespace, service.Name, err)
 			}
 		}
+		err := cont.deleteFinalizer(service)
+		if err != nil {
+			cont.log.Debugf("Error patch service %s/%s: %v", service.Namespace, service.Name, err)
+		}
 		cont.log.Debugf("Service %s/%s unforwarded", service.Namespace, service.Name)
 	}
 }
@@ -197,12 +205,50 @@ func makeForwardings(service *kubecore.Service) []*Forwarding {
 	return forwardings
 }
 
-func (cont *Controller) patchService(svc *kubecore.Service) error {
+const LoadBalancerFinalizer = "service.kubernetes.io/load-balancer"
+
+func (cont *Controller) addFinalizer(oldSvc *kubecore.Service) error {
 	var err error
-	oldData, err := json.Marshal(svc)
+	for _, finalizer := range oldSvc.ObjectMeta.Finalizers {
+		if finalizer == LoadBalancerFinalizer {
+			return err
+		}
+	}
+	newSvc := oldSvc.DeepCopy()
+	newSvc.ObjectMeta.Finalizers = append(newSvc.ObjectMeta.Finalizers, LoadBalancerFinalizer)
+	err = cont.patchService(oldSvc, newSvc)
 	if err != nil {
 		return err
 	}
+	return err
+}
+
+func (cont *Controller) deleteFinalizer(oldSvc *kubecore.Service) error {
+	var err error
+	haveFinalizer := false
+	newFinalizers := make([]string, 0)
+	for _, finalizer := range oldSvc.ObjectMeta.Finalizers {
+		if finalizer == LoadBalancerFinalizer {
+			haveFinalizer = true
+		} else {
+			newFinalizers = append(newFinalizers, finalizer)
+		}
+	}
+	if !haveFinalizer {
+		return err
+	}
+	newSvc := oldSvc.DeepCopy()
+	newSvc.ObjectMeta.Finalizers = newFinalizers
+	err = cont.patchService(oldSvc, newSvc)
+	if err != nil {
+		return err
+	}
+	return err
+}
+
+func (cont *Controller) addStatus(oldSvc *kubecore.Service) error {
+	var err error
+	newSvc := oldSvc.DeepCopy()
 	ingressMode := kubecore.LoadBalancerIPModeProxy
 	ingresses := make([]kubecore.LoadBalancerIngress, 0)
 	ingresses = append(ingresses, kubecore.LoadBalancerIngress{
@@ -212,13 +258,24 @@ func (cont *Controller) patchService(svc *kubecore.Service) error {
 	status := kubecore.LoadBalancerStatus{
 		Ingress: ingresses,
 	}
-	svc.Status.LoadBalancer = status
-
-	newData, err := json.Marshal(svc)
+	newSvc.Status.LoadBalancer = status
+	err = cont.patchService(oldSvc, newSvc)
 	if err != nil {
 		return err
 	}
+	return err
+}
 
+func (cont *Controller) patchService(oldSvc, newSvc *kubecore.Service) error {
+	var err error
+	oldData, err := json.Marshal(oldSvc)
+	if err != nil {
+		return err
+	}
+	newData, err := json.Marshal(newSvc)
+	if err != nil {
+		return err
+	}
 	patchBytes, err := k8patch.CreateTwoWayMergePatch(oldData, newData, kubecore.Service{})
 	if err != nil {
 		return err
@@ -228,8 +285,8 @@ func (cont *Controller) patchService(svc *kubecore.Service) error {
 	ctx, _ := context.WithTimeout(cont.ctx, 5*time.Second)
 	patchServiceOpts := k8meta.PatchOptions{}
 	strategy := k8types.StrategicMergePatchType
-	_, err = cont.clientset.CoreV1().Services(svc.Namespace).
-		Patch(ctx, svc.Name, strategy, patchBytes, patchServiceOpts, "status")
+	_, err = cont.clientset.CoreV1().Services(oldSvc.Namespace).
+		Patch(ctx, oldSvc.Name, strategy, patchBytes, patchServiceOpts, "status")
 	if err != nil {
 		return err
 	}