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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"
"time"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
gardencoreinformers "github.com/gardener/gardener/pkg/client/core/informers/externalversions"
gardencorelisters "github.com/gardener/gardener/pkg/client/core/listers/core/v1beta1"
"github.com/gardener/gardener/pkg/client/kubernetes/clientmap"
"github.com/gardener/gardener/pkg/client/kubernetes/clientmap/keys"
"github.com/gardener/gardener/pkg/controllerutils"
"github.com/gardener/gardener/pkg/logger"
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"
)
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)
}
func (c *Controller) reconcileQuotaKey(key string) error {
namespace, name, err := cache.SplitMetaNamespaceKey(key)
if err != nil {
return err
}
quota, err := c.quotaLister.Quotas(namespace).Get(name)
if apierrors.IsNotFound(err) {
logger.Logger.Debugf("[QUOTA RECONCILE] %s - skipping because Quota has been deleted", key)
return nil
}
if err != nil {
logger.Logger.Infof("[QUOTA RECONCILE] %s - unable to retrieve object from store: %v", key, err)
return err
}
if err := c.control.ReconcileQuota(quota); err != nil {
c.quotaQueue.AddAfter(key, time.Minute)
}
return nil
}
// ControlInterface implements the control logic for updating Quotas. It is implemented as an interface to allow
// for extensions that provide different semantics. Currently, there is only one implementation.
type ControlInterface interface {
// ReconcileQuota implements the control logic for Quota creation, update, and deletion.
// If an implementation returns a non-nil error, the invocation will be retried using a rate-limited strategy.
// Implementors should sink any errors that they do not wish to trigger a retry, and they may feel free to
// exit exceptionally at any point provided they wish the update to be re-run at a later point in time.
ReconcileQuota(quota *gardencorev1beta1.Quota) error
}
// NewDefaultControl returns a new instance of the default implementation ControlInterface that
// implements the documented semantics for Quotas. You should use an instance returned from NewDefaultControl()
// for any scenario other than testing.
func NewDefaultControl(clientMap clientmap.ClientMap, k8sGardenCoreInformers gardencoreinformers.SharedInformerFactory, recorder record.EventRecorder, secretBindingLister gardencorelisters.SecretBindingLister) ControlInterface {
return &defaultControl{clientMap, k8sGardenCoreInformers, recorder, secretBindingLister}
}
type defaultControl struct {
clientMap clientmap.ClientMap
k8sGardenCoreInformers gardencoreinformers.SharedInformerFactory
recorder record.EventRecorder
secretBindingLister gardencorelisters.SecretBindingLister
}
func (c *defaultControl) ReconcileQuota(obj *gardencorev1beta1.Quota) error {
_, err := cache.MetaNamespaceKeyFunc(obj)
if err != nil {
return err
}
var (
ctx = context.TODO()
quota = obj.DeepCopy()
quotaLogger = logger.NewFieldLogger(logger.Logger, "quota", fmt.Sprintf("%s/%s", quota.Namespace, quota.Name))
)
gardenClient, err := c.clientMap.GetClient(ctx, keys.ForGarden())
if err != nil {
return fmt.Errorf("failed to get garden client: %w", err)
}
// 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 nil
}
associatedSecretBindings, err := controllerutils.DetermineSecretBindingAssociations(quota, c.secretBindingLister)
if err != nil {
quotaLogger.Error(err.Error())
return err
}
if len(associatedSecretBindings) == 0 {
quotaLogger.Info("No SecretBindings are referencing the Quota. Deletion accepted.")
// Remove finalizer from Quota
if err := controllerutils.RemoveGardenerFinalizer(ctx, gardenClient.DirectClient(), quota); err != nil {
return fmt.Errorf("failed removing finalizer from quota: %w", err)
}
return nil
}
message := fmt.Sprintf("Can't delete Quota, because the following SecretBindings are still referencing it: %v", associatedSecretBindings)
quotaLogger.Info(message)
c.recorder.Event(quota, corev1.EventTypeNormal, v1beta1constants.EventResourceReferenced, message)
return errors.New("quota still has references")
}
if err := controllerutils.EnsureFinalizer(ctx, gardenClient.Client(), quota, gardencorev1beta1.GardenerName); err != nil {
quotaLogger.Errorf("Could not add finalizer to Quota: %s", err.Error())
return err
}
return nil
}