/
reconciler.go
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/
reconciler.go
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// Copyright (c) 2020 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 containerruntime
import (
"context"
"fmt"
corev1 "k8s.io/api/core/v1"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
extensionscontroller "github.com/gardener/gardener/extensions/pkg/controller"
"github.com/gardener/gardener/extensions/pkg/util"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
gardencorev1beta1helper "github.com/gardener/gardener/pkg/apis/core/v1beta1/helper"
extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"
"github.com/go-logr/logr"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/client-go/tools/record"
"k8s.io/client-go/util/retry"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/manager"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"sigs.k8s.io/controller-runtime/pkg/runtime/inject"
)
const (
// EventContainerRuntimeReconciliation an event reason to describe container runtime reconciliation.
EventContainerRuntimeReconciliation string = "ContainerRuntimeReconciliation"
// EventContainerRuntimeDeletion an event reason to describe container runtime deletion.
EventContainerRuntimeDeletion string = "ContainerRuntimeDeletion"
// EventContainerRuntimeRestoration an event reason to describe container runtime restoration.
EventContainerRuntimeRestoration string = "ContainerRuntimeRestoration"
// EventContainerRuntimeMigration an event reason to describe container runtime migration.
EventContainerRuntimeMigration string = "ContainerRuntimeMigration"
)
// reconciler reconciles ContainerRuntime resources of Gardener's
// `extensions.gardener.cloud` API group.
type reconciler struct {
logger logr.Logger
actuator Actuator
ctx context.Context
client client.Client
recorder record.EventRecorder
}
// NewReconciler creates a new reconcile.Reconciler that reconciles
// ContainerRuntime resources of Gardener's `extensions.gardener.cloud` API group.
func NewReconciler(mgr manager.Manager, actuator Actuator) reconcile.Reconciler {
return extensionscontroller.OperationAnnotationWrapper(
&extensionsv1alpha1.ContainerRuntime{},
&reconciler{
logger: log.Log.WithName(ControllerName),
actuator: actuator,
recorder: mgr.GetEventRecorderFor(ControllerName),
},
)
}
// InjectFunc enables dependency injection into the actuator.
func (r *reconciler) InjectFunc(f inject.Func) error {
return f(r.actuator)
}
// InjectClient injects the controller runtime client into the reconciler.
func (r *reconciler) InjectClient(client client.Client) error {
r.client = client
return nil
}
// InjectStopChannel is an implementation for getting the respective stop channel managed by the controller-runtime.
func (r *reconciler) InjectStopChannel(stopCh <-chan struct{}) error {
r.ctx = util.ContextFromStopChannel(stopCh)
return nil
}
// Reconcile is the reconciler function that gets executed in case there are new events for `ContainerRuntime` resources.
func (r *reconciler) Reconcile(request reconcile.Request) (reconcile.Result, error) {
cr := &extensionsv1alpha1.ContainerRuntime{}
if err := r.client.Get(r.ctx, request.NamespacedName, cr); err != nil {
if errors.IsNotFound(err) {
return reconcile.Result{}, nil
}
return reconcile.Result{}, err
}
cluster, err := extensionscontroller.GetCluster(r.ctx, r.client, cr.Namespace)
if err != nil {
return reconcile.Result{}, err
}
if extensionscontroller.IsFailed(cluster) {
r.logger.Info("Stop reconciling ContainerRuntime of failed Shoot.", "namespace", request.Namespace, "name", cr.Name)
return reconcile.Result{}, nil
}
operationType := gardencorev1beta1helper.ComputeOperationType(cr.ObjectMeta, cr.Status.LastOperation)
switch {
case extensionscontroller.IsMigrated(cr):
return reconcile.Result{}, nil
case operationType == gardencorev1beta1.LastOperationTypeMigrate:
return r.migrate(r.ctx, cr, cluster)
case cr.DeletionTimestamp != nil:
return r.delete(r.ctx, cr, cluster)
case cr.Annotations[v1beta1constants.GardenerOperation] == v1beta1constants.GardenerOperationRestore:
return r.restore(r.ctx, cr, cluster, operationType)
default:
return r.reconcile(r.ctx, cr, cluster, operationType)
}
}
func (r *reconciler) reconcile(ctx context.Context, cr *extensionsv1alpha1.ContainerRuntime, cluster *extensionscontroller.Cluster, operationType gardencorev1beta1.LastOperationType) (reconcile.Result, error) {
if err := extensionscontroller.EnsureFinalizer(ctx, r.client, FinalizerName, cr); err != nil {
return reconcile.Result{}, err
}
if err := r.updateStatusProcessing(ctx, cr, operationType, EventContainerRuntimeReconciliation, "Reconciling the container runtime"); err != nil {
return reconcile.Result{}, err
}
if err := r.actuator.Reconcile(ctx, cr, cluster); err != nil {
utilruntime.HandleError(r.updateStatusError(ctx, extensionscontroller.ReconcileErrCauseOrErr(err), cr, operationType, EventContainerRuntimeReconciliation, "Error reconciling container runtime"))
return extensionscontroller.ReconcileErr(err)
}
if err := r.updateStatusSuccess(ctx, cr, operationType, EventContainerRuntimeReconciliation, "Successfully reconciled container runtime"); err != nil {
return reconcile.Result{}, err
}
return reconcile.Result{}, nil
}
func (r *reconciler) restore(ctx context.Context, cr *extensionsv1alpha1.ContainerRuntime, cluster *extensionscontroller.Cluster, operationType gardencorev1beta1.LastOperationType) (reconcile.Result, error) {
if err := extensionscontroller.EnsureFinalizer(ctx, r.client, FinalizerName, cr); err != nil {
return reconcile.Result{}, err
}
if err := r.updateStatusProcessing(ctx, cr, operationType, EventContainerRuntimeRestoration, "Restoring the container runtime"); err != nil {
return reconcile.Result{}, err
}
if err := r.actuator.Restore(ctx, cr, cluster); err != nil {
utilruntime.HandleError(r.updateStatusError(ctx, extensionscontroller.ReconcileErrCauseOrErr(err), cr, operationType, EventContainerRuntimeRestoration, "Error restoring container runtime"))
return extensionscontroller.ReconcileErr(err)
}
if err := r.updateStatusSuccess(ctx, cr, operationType, EventContainerRuntimeRestoration, "Successfully restored container runtime"); err != nil {
return reconcile.Result{}, err
}
// remove operation annotation 'restore'
if err := extensionscontroller.RemoveAnnotation(ctx, r.client, cr, v1beta1constants.GardenerOperation); err != nil {
msg := "Error removing annotation from ContainerRuntime"
r.recorder.Eventf(cr, corev1.EventTypeWarning, EventContainerRuntimeRestoration, "%s: %+v", msg, err)
return reconcile.Result{}, fmt.Errorf("%s: %+v", msg, err)
}
return reconcile.Result{}, nil
}
func (r *reconciler) delete(ctx context.Context, cr *extensionsv1alpha1.ContainerRuntime, cluster *extensionscontroller.Cluster) (reconcile.Result, error) {
hasFinalizer, err := extensionscontroller.HasFinalizer(cr, FinalizerName)
if err != nil {
return reconcile.Result{}, fmt.Errorf("could not instantiate finalizer deletion: %+v", err)
}
if !hasFinalizer {
r.logger.Info("Deleting container runtime causes a no-op as there is no finalizer.", "containerruntime", cr.Name)
return reconcile.Result{}, nil
}
if err := r.updateStatusProcessing(ctx, cr, gardencorev1beta1.LastOperationTypeDelete, EventContainerRuntimeDeletion, "Deleting the container runtime"); err != nil {
return reconcile.Result{}, err
}
if err := r.actuator.Delete(r.ctx, cr, cluster); err != nil {
utilruntime.HandleError(r.updateStatusError(ctx, extensionscontroller.ReconcileErrCauseOrErr(err), cr, gardencorev1beta1.LastOperationTypeDelete, EventContainerRuntimeDeletion, "Error deleting container runtime"))
return extensionscontroller.ReconcileErr(err)
}
if err := r.updateStatusSuccess(ctx, cr, gardencorev1beta1.LastOperationTypeDelete, EventContainerRuntimeDeletion, "Successfully deleted container runtime"); err != nil {
return reconcile.Result{}, err
}
r.logger.Info("Removing finalizer.", "containerruntime", cr.Name)
if err := extensionscontroller.DeleteFinalizer(ctx, r.client, FinalizerName, cr); err != nil {
return reconcile.Result{}, fmt.Errorf("error removing finalizer from the container runtime resource: %+v", err)
}
return reconcile.Result{}, nil
}
func (r *reconciler) migrate(ctx context.Context, cr *extensionsv1alpha1.ContainerRuntime, cluster *extensionscontroller.Cluster) (reconcile.Result, error) {
if err := r.updateStatusProcessing(ctx, cr, gardencorev1beta1.LastOperationTypeMigrate, EventContainerRuntimeMigration, "Migrating the container runtime"); err != nil {
return reconcile.Result{}, err
}
if err := r.actuator.Migrate(r.ctx, cr, cluster); err != nil {
utilruntime.HandleError(r.updateStatusError(ctx, extensionscontroller.ReconcileErrCauseOrErr(err), cr, gardencorev1beta1.LastOperationTypeMigrate, EventContainerRuntimeMigration, "Error migrating container runtime"))
return extensionscontroller.ReconcileErr(err)
}
if err := r.updateStatusSuccess(ctx, cr, gardencorev1beta1.LastOperationTypeMigrate, EventContainerRuntimeMigration, "Successfully migrated container runtime"); err != nil {
return reconcile.Result{}, err
}
r.logger.Info("Removing all finalizers.", "containerruntime", cr.Name)
if err := extensionscontroller.DeleteAllFinalizers(ctx, r.client, cr); err != nil {
return reconcile.Result{}, fmt.Errorf("error removing finalizers from the container runtime resource: %+v", err)
}
// remove operation annotation 'migrate'
if err := extensionscontroller.RemoveAnnotation(ctx, r.client, cr, v1beta1constants.GardenerOperation); err != nil {
msg := "Error removing annotation from ContainerRuntime"
r.recorder.Eventf(cr, corev1.EventTypeWarning, EventContainerRuntimeMigration, "%s: %+v", msg, err)
return reconcile.Result{}, fmt.Errorf("%s: %+v", msg, err)
}
return reconcile.Result{}, nil
}
func (r *reconciler) updateStatusProcessing(ctx context.Context, cr *extensionsv1alpha1.ContainerRuntime, lastOperationType gardencorev1beta1.LastOperationType, eventReason, description string) error {
r.logger.Info(description, "containerruntime", cr.Name)
r.recorder.Event(cr, corev1.EventTypeNormal, eventReason, description)
return extensionscontroller.TryUpdateStatus(ctx, retry.DefaultBackoff, r.client, cr, func() error {
cr.Status.LastOperation = extensionscontroller.LastOperation(lastOperationType, gardencorev1beta1.LastOperationStateProcessing, 1, description)
return nil
})
}
func (r *reconciler) updateStatusError(ctx context.Context, err error, cr *extensionsv1alpha1.ContainerRuntime, lastOperationType gardencorev1beta1.LastOperationType, eventReason, description string) error {
r.recorder.Eventf(cr, corev1.EventTypeWarning, eventReason, "%s: %+v", description, err)
return extensionscontroller.TryUpdateStatus(ctx, retry.DefaultBackoff, r.client, cr, func() error {
cr.Status.ObservedGeneration = cr.Generation
cr.Status.LastOperation, cr.Status.LastError = extensionscontroller.ReconcileError(lastOperationType, gardencorev1beta1helper.FormatLastErrDescription(fmt.Errorf("%s: %v", description, err)), 50, gardencorev1beta1helper.ExtractErrorCodes(err)...)
return nil
})
}
func (r *reconciler) updateStatusSuccess(ctx context.Context, cr *extensionsv1alpha1.ContainerRuntime, lastOperationType gardencorev1beta1.LastOperationType, eventReason, description string) error {
r.logger.Info(description, "containerruntime", cr.Name)
r.recorder.Event(cr, corev1.EventTypeNormal, eventReason, description)
return extensionscontroller.TryUpdateStatus(ctx, retry.DefaultBackoff, r.client, cr, func() error {
cr.Status.ObservedGeneration = cr.Generation
cr.Status.LastOperation, cr.Status.LastError = extensionscontroller.ReconcileSucceeded(lastOperationType, description)
return nil
})
}