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quota_control.go
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quota_control.go
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// Copyright (c) 2018 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 quota
import (
"context"
"errors"
"fmt"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
gardencorelisters "github.com/gardener/gardener/pkg/client/core/listers/core/v1beta1"
"github.com/gardener/gardener/pkg/controllerutils"
"github.com/gardener/gardener/pkg/logger"
"github.com/sirupsen/logrus"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/client-go/tools/cache"
"k8s.io/client-go/tools/record"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
)
func (c *Controller) quotaAdd(obj interface{}) {
key, err := cache.MetaNamespaceKeyFunc(obj)
if err != nil {
logger.Logger.Errorf("Couldn't get key for object %+v: %v", obj, err)
return
}
c.quotaQueue.Add(key)
}
func (c *Controller) quotaUpdate(oldObj, newObj interface{}) {
c.quotaAdd(newObj)
}
func (c *Controller) quotaDelete(obj interface{}) {
key, err := cache.DeletionHandlingMetaNamespaceKeyFunc(obj)
if err != nil {
logger.Logger.Errorf("Couldn't get key for object %+v: %v", obj, err)
return
}
c.quotaQueue.Add(key)
}
// NewQuotaReconciler creates a new instance of a reconciler which reconciles Quotas.
func NewQuotaReconciler(l logrus.FieldLogger, gardenClient client.Client, recorder record.EventRecorder, secretBindingLister gardencorelisters.SecretBindingLister) reconcile.Reconciler {
return "aReconciler{
logger: l,
gardenClient: gardenClient,
recorder: recorder,
secretBindingLister: secretBindingLister,
}
}
type quotaReconciler struct {
logger logrus.FieldLogger
gardenClient client.Client
recorder record.EventRecorder
secretBindingLister gardencorelisters.SecretBindingLister
}
func (r *quotaReconciler) Reconcile(ctx context.Context, request reconcile.Request) (reconcile.Result, error) {
quota := &gardencorev1beta1.Quota{}
if err := r.gardenClient.Get(ctx, request.NamespacedName, quota); err != nil {
if apierrors.IsNotFound(err) {
r.logger.Infof("Object %q is gone, stop reconciling: %v", request.Name, err)
return reconcile.Result{}, nil
}
r.logger.Infof("Unable to retrieve object %q from store: %v", request.Name, err)
return reconcile.Result{}, err
}
quotaLogger := logger.NewFieldLogger(r.logger, "quota", fmt.Sprintf("%s/%s", quota.Namespace, quota.Name))
// The deletionTimestamp labels a Quota as intended to get deleted. Before deletion,
// it has to be ensured that no SecretBindings are depending on the Quota anymore.
// When this happens the controller will remove the finalizers from the Quota so that it can be garbage collected.
if quota.DeletionTimestamp != nil {
if !sets.NewString(quota.Finalizers...).Has(gardencorev1beta1.GardenerName) {
return reconcile.Result{}, nil
}
associatedSecretBindings, err := controllerutils.DetermineSecretBindingAssociations(quota, r.secretBindingLister)
if err != nil {
quotaLogger.Error(err.Error())
return reconcile.Result{}, err
}
if len(associatedSecretBindings) == 0 {
quotaLogger.Info("No SecretBindings are referencing the Quota. Deletion accepted.")
// Remove finalizer from Quota
if err := controllerutils.PatchRemoveFinalizers(ctx, r.gardenClient, quota, gardencorev1beta1.GardenerName); err != nil {
return reconcile.Result{}, fmt.Errorf("failed removing finalizer from quota: %w", err)
}
return reconcile.Result{}, nil
}
message := fmt.Sprintf("Can't delete Quota, because the following SecretBindings are still referencing it: %v", associatedSecretBindings)
quotaLogger.Info(message)
r.recorder.Event(quota, corev1.EventTypeNormal, v1beta1constants.EventResourceReferenced, message)
return reconcile.Result{}, errors.New("quota still has references")
}
if err := controllerutils.PatchAddFinalizers(ctx, r.gardenClient, quota, gardencorev1beta1.GardenerName); err != nil {
quotaLogger.Errorf("Could not add finalizer to Quota: %s", err.Error())
return reconcile.Result{}, err
}
return reconcile.Result{}, nil
}