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secretbinding_control.go
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secretbinding_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 secretbinding
import (
"context"
"errors"
"fmt"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/controllerutils"
"github.com/gardener/gardener/pkg/logger"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/sirupsen/logrus"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"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/controller/controllerutil"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
)
func (c *Controller) secretBindingAdd(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.secretBindingQueue.Add(key)
}
func (c *Controller) secretBindingUpdate(oldObj, newObj interface{}) {
c.secretBindingAdd(newObj)
}
func (c *Controller) secretBindingDelete(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.secretBindingQueue.Add(key)
}
// NewSecretBindingReconciler creates a new instance of a reconciler which reconciles SecretBindings.
func NewSecretBindingReconciler(l logrus.FieldLogger, gardenClient client.Client, recorder record.EventRecorder) reconcile.Reconciler {
return &secretBindingReconciler{
logger: l,
gardenClient: gardenClient,
recorder: recorder,
}
}
type secretBindingReconciler struct {
logger logrus.FieldLogger
gardenClient client.Client
recorder record.EventRecorder
}
func (r *secretBindingReconciler) Reconcile(ctx context.Context, request reconcile.Request) (reconcile.Result, error) {
secretBinding := &gardencorev1beta1.SecretBinding{}
if err := r.gardenClient.Get(ctx, request.NamespacedName, secretBinding); 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
}
secretBindingLogger := logger.NewFieldLogger(r.logger, "secretbinding", fmt.Sprintf("%s/%s", secretBinding.Namespace, secretBinding.Name))
// The deletionTimestamp labels a SecretBinding as intended to get deleted. Before deletion,
// it has to be ensured that no Shoots are depending on the SecretBinding anymore.
// When this happens the controller will remove the finalizers from the SecretBinding so that it can be garbage collected.
if secretBinding.DeletionTimestamp != nil {
if !controllerutil.ContainsFinalizer(secretBinding, gardencorev1beta1.GardenerName) {
return reconcile.Result{}, nil
}
associatedShoots, err := controllerutils.DetermineShootsAssociatedTo(ctx, r.gardenClient, secretBinding)
if err != nil {
secretBindingLogger.Error(err.Error())
return reconcile.Result{}, err
}
if len(associatedShoots) == 0 {
secretBindingLogger.Info("No Shoots are referencing the SecretBinding. Deletion accepted.")
mayReleaseSecret, err := r.mayReleaseSecret(ctx, secretBinding.Namespace, secretBinding.Name, secretBinding.SecretRef.Namespace, secretBinding.SecretRef.Name)
if err != nil {
secretBindingLogger.Error(err.Error())
return reconcile.Result{}, err
}
if mayReleaseSecret {
// Remove finalizer from referenced secret
secret := &corev1.Secret{}
if err := r.gardenClient.Get(ctx, kutil.Key(secretBinding.SecretRef.Namespace, secretBinding.SecretRef.Name), secret); err == nil {
if err2 := controllerutils.PatchRemoveFinalizers(ctx, r.gardenClient, secret.DeepCopy(), gardencorev1beta1.ExternalGardenerName); err2 != nil {
secretBindingLogger.Error(err2.Error())
return reconcile.Result{}, err2
}
} else if !apierrors.IsNotFound(err) {
return reconcile.Result{}, err
}
}
// Remove finalizer from SecretBinding
if err := controllerutils.PatchRemoveFinalizers(ctx, r.gardenClient, secretBinding, gardencorev1beta1.GardenerName); err != nil {
secretBindingLogger.Error(err.Error())
return reconcile.Result{}, err
}
return reconcile.Result{}, nil
}
message := fmt.Sprintf("Can't delete SecretBinding, because the following Shoots are still referencing it: %v", associatedShoots)
secretBindingLogger.Infof(message)
r.recorder.Event(secretBinding, corev1.EventTypeNormal, v1beta1constants.EventResourceReferenced, message)
return reconcile.Result{}, errors.New("SecretBinding still has references")
}
if err := controllerutils.PatchAddFinalizers(ctx, r.gardenClient, secretBinding, gardencorev1beta1.GardenerName); err != nil {
secretBindingLogger.Errorf("Could not add finalizer to SecretBinding: %s", err.Error())
return reconcile.Result{}, err
}
// Add the Gardener finalizer to the referenced SecretBinding secret to protect it from deletion as long as
// the SecretBinding resource does exist.
secret := &corev1.Secret{}
if err := r.gardenClient.Get(ctx, kutil.Key(secretBinding.SecretRef.Namespace, secretBinding.SecretRef.Name), secret); err != nil {
secretBindingLogger.Error(err.Error())
return reconcile.Result{}, err
}
if err := controllerutils.PatchAddFinalizers(ctx, r.gardenClient, secret.DeepCopy(), gardencorev1beta1.ExternalGardenerName); err != nil {
secretBindingLogger.Errorf("Could not add finalizer to Secret referenced in SecretBinding: %s", err.Error())
return reconcile.Result{}, err
}
return reconcile.Result{}, nil
}
// We may only release a secret if there is no other secretbinding that references it (maybe in a different namespace).
func (r *secretBindingReconciler) mayReleaseSecret(ctx context.Context, secretBindingNamespace, secretBindingName, secretNamespace, secretName string) (bool, error) {
secretBindingList := &gardencorev1beta1.SecretBindingList{}
if err := r.gardenClient.List(ctx, secretBindingList); err != nil {
return false, err
}
for _, secretBinding := range secretBindingList.Items {
if secretBinding.Namespace == secretBindingNamespace && secretBinding.Name == secretBindingName {
continue
}
if secretBinding.SecretRef.Namespace == secretNamespace && secretBinding.SecretRef.Name == secretName {
return false, nil
}
}
return true, nil
}