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reconciler.go
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reconciler.go
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// Copyright 2019 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 extension
import (
"context"
"fmt"
"time"
"github.com/go-logr/logr"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"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/manager"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
extensionscontroller "github.com/gardener/gardener/extensions/pkg/controller"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
v1beta1helper "github.com/gardener/gardener/pkg/apis/core/v1beta1/helper"
extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"
"github.com/gardener/gardener/pkg/controllerutils"
reconcilerutils "github.com/gardener/gardener/pkg/controllerutils/reconciler"
)
// reconciler reconciles Extension resources of Gardener's
// `extensions.gardener.cloud` API group.
type reconciler struct {
actuator Actuator
client client.Client
reader client.Reader
statusUpdater extensionscontroller.StatusUpdater
resync time.Duration
finalizerName string
}
// NewReconciler creates a new reconcile.Reconciler that reconciles
// Extension resources of Gardener's `extensions.gardener.cloud` API group.
func NewReconciler(mgr manager.Manager, args AddArgs) reconcile.Reconciler {
return reconcilerutils.OperationAnnotationWrapper(
mgr,
func() client.Object { return &extensionsv1alpha1.Extension{} },
&reconciler{
actuator: args.Actuator,
client: mgr.GetClient(),
reader: mgr.GetAPIReader(),
statusUpdater: extensionscontroller.NewStatusUpdater(mgr.GetClient()),
finalizerName: fmt.Sprintf("%s/%s", FinalizerPrefix, args.FinalizerSuffix),
resync: args.Resync,
},
)
}
// Reconcile is the reconciler function that gets executed in case there are new events for `Extension` resources.
func (r *reconciler) Reconcile(ctx context.Context, request reconcile.Request) (reconcile.Result, error) {
log := logf.FromContext(ctx)
ex := &extensionsv1alpha1.Extension{}
if err := r.client.Get(ctx, request.NamespacedName, ex); 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)
}
var result reconcile.Result
cluster, err := extensionscontroller.GetCluster(ctx, r.client, ex.Namespace)
if err != nil {
return reconcile.Result{}, err
}
if extensionscontroller.IsFailed(cluster) {
log.Info("Skipping the reconciliation of Extension of failed shoot")
return reconcile.Result{}, nil
}
operationType := v1beta1helper.ComputeOperationType(ex.ObjectMeta, ex.Status.LastOperation)
switch {
case extensionscontroller.ShouldSkipOperation(operationType, ex):
return reconcile.Result{}, nil
case operationType == gardencorev1beta1.LastOperationTypeMigrate:
return r.migrate(ctx, log, ex)
case ex.DeletionTimestamp != nil:
return r.delete(ctx, log, ex)
case operationType == gardencorev1beta1.LastOperationTypeRestore:
return r.restore(ctx, log, ex, operationType)
default:
if result, err = r.reconcile(ctx, log, ex, operationType); err != nil {
return result, err
}
return reconcile.Result{Requeue: r.resync != 0, RequeueAfter: r.resync}, nil
}
}
func (r *reconciler) reconcile(
ctx context.Context,
log logr.Logger,
ex *extensionsv1alpha1.Extension,
operationType gardencorev1beta1.LastOperationType,
) (
reconcile.Result,
error,
) {
if !controllerutil.ContainsFinalizer(ex, r.finalizerName) {
log.Info("Adding finalizer")
if err := controllerutils.AddFinalizers(ctx, r.client, ex, r.finalizerName); err != nil {
return reconcile.Result{}, fmt.Errorf("failed to add finalizer: %w", err)
}
}
if err := r.statusUpdater.Processing(ctx, log, ex, operationType, "Reconciling the Extension"); err != nil {
return reconcile.Result{}, err
}
log.Info("Starting the reconciliation of Extension")
if err := r.actuator.Reconcile(ctx, log, ex); err != nil {
_ = r.statusUpdater.Error(ctx, log, ex, reconcilerutils.ReconcileErrCauseOrErr(err), operationType, "Error reconciling Extension")
return reconcilerutils.ReconcileErr(err)
}
if err := r.statusUpdater.Success(ctx, log, ex, operationType, "Successfully reconciled Extension"); err != nil {
return reconcile.Result{}, err
}
return reconcile.Result{}, nil
}
func (r *reconciler) delete(ctx context.Context, log logr.Logger, ex *extensionsv1alpha1.Extension) (reconcile.Result, error) {
if !controllerutil.ContainsFinalizer(ex, r.finalizerName) {
log.Info("Deleting Extension causes a no-op as there is no finalizer")
return reconcile.Result{}, nil
}
if err := r.statusUpdater.Processing(ctx, log, ex, gardencorev1beta1.LastOperationTypeDelete, "Deleting the Extension"); err != nil {
return reconcile.Result{}, err
}
log.Info("Starting the deletion of Extension")
if err := r.actuator.Delete(ctx, log, ex); err != nil {
_ = r.statusUpdater.Error(ctx, log, ex, reconcilerutils.ReconcileErrCauseOrErr(err), gardencorev1beta1.LastOperationTypeDelete, "Error deleting the Extension")
return reconcilerutils.ReconcileErr(err)
}
if err := r.statusUpdater.Success(ctx, log, ex, gardencorev1beta1.LastOperationTypeDelete, "Successfully deleted the Extension"); err != nil {
return reconcile.Result{}, err
}
if controllerutil.ContainsFinalizer(ex, r.finalizerName) {
log.Info("Removing finalizer")
if err := controllerutils.RemoveFinalizers(ctx, r.client, ex, r.finalizerName); err != nil {
return reconcile.Result{}, fmt.Errorf("failed to remove finalizer: %w", err)
}
}
return reconcile.Result{}, nil
}
func (r *reconciler) restore(
ctx context.Context,
log logr.Logger,
ex *extensionsv1alpha1.Extension,
operationType gardencorev1beta1.LastOperationType,
) (
reconcile.Result,
error,
) {
if !controllerutil.ContainsFinalizer(ex, r.finalizerName) {
log.Info("Adding finalizer")
if err := controllerutils.AddFinalizers(ctx, r.client, ex, r.finalizerName); err != nil {
return reconcile.Result{}, fmt.Errorf("failed to add finalizer: %w", err)
}
}
if err := r.statusUpdater.Processing(ctx, log, ex, operationType, "Restoring Extension resource"); err != nil {
return reconcile.Result{}, err
}
log.Info("Starting the restoration of extension")
if err := r.actuator.Restore(ctx, log, ex); err != nil {
_ = r.statusUpdater.Error(ctx, log, ex, reconcilerutils.ReconcileErrCauseOrErr(err), operationType, "Unable to restore Extension resource")
return reconcilerutils.ReconcileErr(err)
}
if err := r.statusUpdater.Success(ctx, log, ex, operationType, "Successfully restored Extension resource"); err != nil {
return reconcile.Result{}, err
}
if err := extensionscontroller.RemoveAnnotation(ctx, r.client, ex, v1beta1constants.GardenerOperation); err != nil {
return reconcile.Result{}, fmt.Errorf("error removing annotation from Extension resource: %+v", err)
}
return reconcile.Result{}, nil
}
func (r *reconciler) migrate(ctx context.Context, log logr.Logger, ex *extensionsv1alpha1.Extension) (reconcile.Result, error) {
if err := r.statusUpdater.Processing(ctx, log, ex, gardencorev1beta1.LastOperationTypeMigrate, "Migrate Extension resource."); err != nil {
return reconcile.Result{}, err
}
log.Info("Starting the migration of extension")
if err := r.actuator.Migrate(ctx, log, ex); err != nil {
_ = r.statusUpdater.Error(ctx, log, ex, reconcilerutils.ReconcileErrCauseOrErr(err), gardencorev1beta1.LastOperationTypeMigrate, "Error migrating Extension resource")
return reconcilerutils.ReconcileErr(err)
}
if err := r.statusUpdater.Success(ctx, log, ex, gardencorev1beta1.LastOperationTypeMigrate, "Successfully migrated Extension resource"); err != nil {
return reconcile.Result{}, err
}
log.Info("Removing all finalizers")
if err := controllerutils.RemoveAllFinalizers(ctx, r.client, ex); err != nil {
return reconcile.Result{}, fmt.Errorf("error removing finalizers: %w", err)
}
if err := extensionscontroller.RemoveAnnotation(ctx, r.client, ex, v1beta1constants.GardenerOperation); err != nil {
return reconcile.Result{}, fmt.Errorf("error removing annotation from Extension resource: %+v", err)
}
return reconcile.Result{}, nil
}