/
reconciler.go
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/
reconciler.go
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// Copyright 2022 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package exposureclass
import (
"context"
"fmt"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/client-go/tools/record"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
logf "sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/ratelimiter"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/controllermanager/apis/config"
"github.com/gardener/gardener/pkg/controllerutils"
)
// Reconciler reconciles ExposureClass.
type Reconciler struct {
Client client.Client
Config config.ExposureClassControllerConfiguration
Recorder record.EventRecorder
// RateLimiter allows limiting exponential backoff for testing purposes
RateLimiter ratelimiter.RateLimiter
}
// Reconcile performs the main reconciliation logic.
func (r *Reconciler) Reconcile(ctx context.Context, request reconcile.Request) (reconcile.Result, error) {
log := logf.FromContext(ctx)
ctx, cancel := controllerutils.GetMainReconciliationContext(ctx, controllerutils.DefaultReconciliationTimeout)
defer cancel()
exposureClass := &gardencorev1beta1.ExposureClass{}
if err := r.Client.Get(ctx, request.NamespacedName, exposureClass); err != nil {
if apierrors.IsNotFound(err) {
log.V(1).Info("Object is gone, stop reconciling")
return reconcile.Result{}, nil
}
return reconcile.Result{}, fmt.Errorf("error retrieving object from store: %w", err)
}
if exposureClass.DeletionTimestamp != nil {
// Ignore the exposure class if it has no gardener finalizer.
if !sets.New(exposureClass.Finalizers...).Has(gardencorev1beta1.GardenerName) {
return reconcile.Result{}, nil
}
// Lookup shoots which reference the exposure class. The finalizer will be only
// removed if there is no Shoot referencing the exposure class anymore.
associatedShoots, err := controllerutils.DetermineShootsAssociatedTo(ctx, r.Client, exposureClass)
if err != nil {
return reconcile.Result{}, err
}
if len(associatedShoots) == 0 {
log.Info("No Shoots are referencing ExposureClass, deletion accepted")
if controllerutil.ContainsFinalizer(exposureClass, gardencorev1beta1.GardenerName) {
log.Info("Removing finalizer")
if err := controllerutils.RemoveFinalizers(ctx, r.Client, exposureClass, gardencorev1beta1.GardenerName); err != nil {
return reconcile.Result{}, fmt.Errorf("failed to remove finalizer: %w", err)
}
}
return reconcile.Result{}, nil
}
message := fmt.Sprintf("Cannot delete ExposureClasss, because it is still associated by the following Shoots: %+v", associatedShoots)
r.Recorder.Event(exposureClass, corev1.EventTypeNormal, v1beta1constants.EventResourceReferenced, message)
return reconcile.Result{}, fmt.Errorf(message)
}
if !controllerutil.ContainsFinalizer(exposureClass, gardencorev1beta1.GardenerName) {
log.Info("Adding finalizer")
if err := controllerutils.AddFinalizers(ctx, r.Client, exposureClass, gardencorev1beta1.GardenerName); err != nil {
return reconcile.Result{}, fmt.Errorf("could not add finalizer: %w", err)
}
}
return reconcile.Result{}, nil
}