add.go

// SPDX-FileCopyrightText: SAP SE or an SAP affiliate company and Gardener contributors
//
// SPDX-License-Identifier: Apache-2.0

package stale

import (
	"reflect"

	"k8s.io/utils/clock"
	"k8s.io/utils/ptr"
	"sigs.k8s.io/controller-runtime/pkg/builder"
	"sigs.k8s.io/controller-runtime/pkg/controller"
	"sigs.k8s.io/controller-runtime/pkg/event"
	"sigs.k8s.io/controller-runtime/pkg/manager"
	"sigs.k8s.io/controller-runtime/pkg/predicate"

	gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
)

// ControllerName is the name of this controller.
const ControllerName = "project-stale"

// AddToManager adds Reconciler to the given manager.
func (r *Reconciler) AddToManager(mgr manager.Manager) error {
	if r.Client == nil {
		r.Client = mgr.GetClient()
	}
	if r.Clock == nil {
		r.Clock = clock.RealClock{}
	}

	return builder.
		ControllerManagedBy(mgr).
		Named(ControllerName).
		For(&gardencorev1beta1.Project{}, builder.WithPredicates(r.ProjectPredicate())).
		WithOptions(controller.Options{
			MaxConcurrentReconciles: ptr.Deref(r.Config.ConcurrentSyncs, 0),
		}).
		Complete(r)
}

// ProjectPredicate returns true for 'CREATE' events. For 'UPDATE' events, it returns true when the
// lastActivityTimestamp in the status is unchanged or the generation is different from the observed generation.
func (r *Reconciler) ProjectPredicate() predicate.Predicate {
	return predicate.Funcs{
		CreateFunc: func(_ event.CreateEvent) bool {
			return true
		},
		UpdateFunc: func(e event.UpdateEvent) bool {
			oldProject, ok := e.ObjectOld.(*gardencorev1beta1.Project)
			if !ok {
				return false
			}
			project, ok := e.ObjectNew.(*gardencorev1beta1.Project)
			if !ok {
				return false
			}

			return reflect.DeepEqual(project.Status.LastActivityTimestamp, oldProject.Status.LastActivityTimestamp) ||
				project.Generation != project.Status.ObservedGeneration
		},
		DeleteFunc:  func(_ event.DeleteEvent) bool { return false },
		GenericFunc: func(_ event.GenericEvent) bool { return false },
	}
}