fix(appset): dont requeue appsets on status change

applicationset/controllers/applicationset_controller.go

@@ -531,33 +531,6 @@ func ignoreNotAllowedNamespaces(namespaces []string) predicate.Predicate {
 	}
 }
 
-// ignoreWhenAnnotationApplicationSetRefreshIsRemoved returns a predicate that ignores updates to ApplicationSet resources
-// when the ApplicationSetRefresh annotation is removed
-// First reconciliation is triggered when the annotation is added by [webhook.go#refreshApplicationSet]
-// Using this predicate we avoid a second reconciliation triggered by the controller himself when the annotation is removed.
-func ignoreWhenAnnotationApplicationSetRefreshIsRemoved() predicate.Predicate {
-	return predicate.Funcs{
-		UpdateFunc: func(e event.UpdateEvent) bool {
-			oldAppset, isAppSet := e.ObjectOld.(*argov1alpha1.ApplicationSet)
-			if !isAppSet {
-				return false
-			}
-			newAppset, isAppSet := e.ObjectNew.(*argov1alpha1.ApplicationSet)
-			if !isAppSet {
-				return false
-			}
-
-			_, oldHasRefreshAnnotation := oldAppset.Annotations[common.AnnotationApplicationSetRefresh]
-			_, newHasRefreshAnnotation := newAppset.Annotations[common.AnnotationApplicationSetRefresh]
-
-			if oldHasRefreshAnnotation && !newHasRefreshAnnotation {
-				return false
-			}
-			return true
-		},
-	}
-}
-
 func appControllerIndexer(rawObj client.Object) []string {
 	// grab the job object, extract the owner...
 	app := rawObj.(*argov1alpha1.Application)
@@ -579,20 +552,20 @@ func (r *ApplicationSetReconciler) SetupWithManager(mgr ctrl.Manager, enableProg
 		return fmt.Errorf("error setting up with manager: %w", err)
 	}
 
-	ownsHandler := getOwnsHandlerPredicates(enableProgressiveSyncs)
+	appOwnsHandler := getApplicationOwnsHandler(enableProgressiveSyncs)
+	appSetOwnsHandler := getApplicationSetOwnsHandler()
 
 	return ctrl.NewControllerManagedBy(mgr).WithOptions(controller.Options{
 		MaxConcurrentReconciles: maxConcurrentReconciliations,
-	}).For(&argov1alpha1.ApplicationSet{}, builder.WithPredicates(ignoreWhenAnnotationApplicationSetRefreshIsRemoved())).
-		Owns(&argov1alpha1.Application{}, builder.WithPredicates(ownsHandler)).
+	}).For(&argov1alpha1.ApplicationSet{}, builder.WithPredicates(appSetOwnsHandler)).
+		Owns(&argov1alpha1.Application{}, builder.WithPredicates(appOwnsHandler)).
 		WithEventFilter(ignoreNotAllowedNamespaces(r.ApplicationSetNamespaces)).
 		Watches(
 			&corev1.Secret{},
 			&clusterSecretEventHandler{
 				Client: mgr.GetClient(),
 				Log:    log.WithField("type", "createSecretEventHandler"),
 			}).
-		// TODO: also watch Applications and respond on changes if we own them.
 		Complete(r)
 }
 
@@ -1486,7 +1459,7 @@ func syncApplication(application argov1alpha1.Application, prune bool) argov1alp
 	return application
 }
 
-func getOwnsHandlerPredicates(enableProgressiveSyncs bool) predicate.Funcs {
+func getApplicationOwnsHandler(enableProgressiveSyncs bool) predicate.Funcs {
 	return predicate.Funcs{
 		CreateFunc: func(e event.CreateEvent) bool {
 			// if we are the owner and there is a create event, we most likely created it and do not need to
@@ -1523,8 +1496,8 @@ func getOwnsHandlerPredicates(enableProgressiveSyncs bool) predicate.Funcs {
 			if !isApp {
 				return false
 			}
-			requeue := shouldRequeueApplicationSet(appOld, appNew, enableProgressiveSyncs)
-			logCtx.WithField("requeue", requeue).Debugf("requeue: %t caused by application %s", requeue, appNew.Name)
+			requeue := shouldRequeueForApplication(appOld, appNew, enableProgressiveSyncs)
+			logCtx.WithField("requeue", requeue).Debugf("requeue caused by application %s", appNew.Name)
 			return requeue
 		},
 		GenericFunc: func(e event.GenericEvent) bool {
@@ -1541,13 +1514,13 @@ func getOwnsHandlerPredicates(enableProgressiveSyncs bool) predicate.Funcs {
 	}
 }
 
-// shouldRequeueApplicationSet determines when we want to requeue an ApplicationSet for reconciling based on an owned
+// shouldRequeueForApplication determines when we want to requeue an ApplicationSet for reconciling based on an owned
 // application change
 // The applicationset controller owns a subset of the Application CR.
 // We do not need to re-reconcile if parts of the application change outside the applicationset's control.
 // An example being, Application.ApplicationStatus.ReconciledAt which gets updated by the application controller.
 // Additionally, Application.ObjectMeta.ResourceVersion and Application.ObjectMeta.Generation which are set by K8s.
-func shouldRequeueApplicationSet(appOld *argov1alpha1.Application, appNew *argov1alpha1.Application, enableProgressiveSyncs bool) bool {
+func shouldRequeueForApplication(appOld *argov1alpha1.Application, appNew *argov1alpha1.Application, enableProgressiveSyncs bool) bool {
 	if appOld == nil || appNew == nil {
 		return false
 	}
@@ -1580,4 +1553,83 @@ func shouldRequeueApplicationSet(appOld *argov1alpha1.Application, appNew *argov
 	return false
 }
 
+func getApplicationSetOwnsHandler() predicate.Funcs {
+	return predicate.Funcs{
+		CreateFunc: func(e event.CreateEvent) bool {
+			appSet, isApp := e.Object.(*argov1alpha1.ApplicationSet)
+			if !isApp {
+				return false
+			}
+			log.WithField("applicationset", appSet.QualifiedName()).Debugln("received create event")
+			// Always queue a new applicationset
+			return true
+		},
+		DeleteFunc: func(e event.DeleteEvent) bool {
+			appSet, isApp := e.Object.(*argov1alpha1.ApplicationSet)
+			if !isApp {
+				return false
+			}
+			log.WithField("applicationset", appSet.QualifiedName()).Debugln("received delete event")
+			// Always queue for the deletion of an applicationset
+			return true
+		},
+		UpdateFunc: func(e event.UpdateEvent) bool {
+			appSetOld, isAppSet := e.ObjectOld.(*argov1alpha1.ApplicationSet)
+			if !isAppSet {
+				return false
+			}
+			appSetNew, isAppSet := e.ObjectNew.(*argov1alpha1.ApplicationSet)
+			if !isAppSet {
+				return false
+			}
+			requeue := shouldRequeueForApplicationSet(appSetOld, appSetNew)
+			log.WithField("applicationset", appSetNew.QualifiedName()).
+				WithField("requeue", requeue).Debugln("received update event")
+			return requeue
+		},
+		GenericFunc: func(e event.GenericEvent) bool {
+			appSet, isApp := e.Object.(*argov1alpha1.ApplicationSet)
+			if !isApp {
+				return false
+			}
+			log.WithField("applicationset", appSet.QualifiedName()).Debugln("received generic event")
+			// Always queue for the generic of an applicationset
+			return true
+		},
+	}
+}
+
+// shouldRequeueForApplicationSet determines when we need to requeue an applicationset
+func shouldRequeueForApplicationSet(appSetOld, appSetNew *argov1alpha1.ApplicationSet) bool {
+	if appSetOld == nil || appSetNew == nil {
+		return false
+	}
+	// only compare the applicationset spec, annotations, labels and finalizers, specifically avoiding
+	// the status field. status is owned by the applicationset controller,
+	// and we do not need to requeue when it does bookkeeping
+	// NB: the ApplicationDestination comes from the ApplicationSpec being embedded
+	// in the ApplicationSetTemplate from the generators
+	if !cmp.Equal(appSetOld.Spec, appSetNew.Spec, cmpopts.EquateEmpty(), cmpopts.EquateComparable(argov1alpha1.ApplicationDestination{})) ||
+		!cmp.Equal(appSetOld.ObjectMeta.GetLabels(), appSetNew.ObjectMeta.GetLabels(), cmpopts.EquateEmpty()) ||
+		!cmp.Equal(appSetOld.ObjectMeta.GetFinalizers(), appSetNew.ObjectMeta.GetFinalizers(), cmpopts.EquateEmpty()) {
+		return true
+	}
+
+	// we do not want to requeue if the new ApplicationSet has the refresh annotation removed
+	// only when the annotation is added.
+	// it is possible that a different annotation changed at the same time and we miss
+	// the change but that is a rare edge case
+	if !cmp.Equal(appSetOld.ObjectMeta.GetAnnotations(), appSetNew.ObjectMeta.GetAnnotations(), cmpopts.EquateEmpty()) {
+		_, oldHasRefreshAnnotation := appSetOld.Annotations[common.AnnotationApplicationSetRefresh]
+		_, newHasRefreshAnnotation := appSetNew.Annotations[common.AnnotationApplicationSetRefresh]
+
+		if oldHasRefreshAnnotation && !newHasRefreshAnnotation {
+			return false
+		}
+		return true
+	}
+
+	return false
+}
+
 var _ handler.EventHandler = &clusterSecretEventHandler{}