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reconciler.go
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reconciler.go
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// Copyright (c) 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 operatingsystemconfig
import (
"context"
"fmt"
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"
gardencorev1beta1helper "github.com/gardener/gardener/pkg/apis/core/v1beta1/helper"
extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"
contextutil "github.com/gardener/gardener/pkg/utils/context"
"github.com/go-logr/logr"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/runtime"
utilruntime "k8s.io/apimachinery/pkg/util/runtime"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
"sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
"sigs.k8s.io/controller-runtime/pkg/runtime/inject"
)
// reconciler reconciles OperatingSystemConfig resources of Gardener's `extensions.gardener.cloud`
// API group.
type reconciler struct {
logger logr.Logger
actuator Actuator
ctx context.Context
client client.Client
scheme *runtime.Scheme
}
var _ reconcile.Reconciler = &reconciler{}
// NewReconciler creates a new reconcile.Reconciler that reconciles
// OperatingSystemConfig resources of Gardener's `extensions.gardener.cloud` API group.
func NewReconciler(actuator Actuator) reconcile.Reconciler {
logger := log.Log.WithName(name)
return extensionscontroller.OperationAnnotationWrapper(
&extensionsv1alpha1.OperatingSystemConfig{},
&reconciler{logger: logger, actuator: actuator},
)
}
// 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
}
func (r *reconciler) InjectScheme(scheme *runtime.Scheme) error {
r.scheme = scheme
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 = contextutil.FromStopChannel(stopCh)
return nil
}
// Reconcile is the reconciler function that gets executed in case there are new events for the `OperatingSystemConfig`
// resources.
func (r *reconciler) Reconcile(request reconcile.Request) (reconcile.Result, error) {
osc := &extensionsv1alpha1.OperatingSystemConfig{}
if err := r.client.Get(r.ctx, request.NamespacedName, osc); err != nil {
if apierrors.IsNotFound(err) {
return reconcile.Result{}, nil
}
return reconcile.Result{}, fmt.Errorf("could not fetch OperatingSystemConfig: %+v", err)
}
shoot, err := extensionscontroller.GetShoot(r.ctx, r.client, request.Namespace)
if err != nil {
return reconcile.Result{}, err
}
if extensionscontroller.IsShootFailed(shoot) {
r.logger.Info("Stop reconciling OperatingSystemConfig of failed Shoot.", "namespace", request.Namespace, "name", osc.Name)
return reconcile.Result{}, nil
}
operationType := gardencorev1beta1helper.ComputeOperationType(osc.ObjectMeta, osc.Status.LastOperation)
switch {
case extensionscontroller.IsMigrated(osc):
return reconcile.Result{}, nil
case operationType == gardencorev1beta1.LastOperationTypeMigrate:
return r.migrate(r.ctx, osc)
case osc.DeletionTimestamp != nil:
return r.delete(r.ctx, osc)
case osc.Annotations[v1beta1constants.GardenerOperation] == v1beta1constants.GardenerOperationRestore:
return r.restore(r.ctx, osc)
default:
return r.reconcile(r.ctx, osc, operationType)
}
}
func (r *reconciler) reconcile(ctx context.Context, osc *extensionsv1alpha1.OperatingSystemConfig, operationType gardencorev1beta1.LastOperationType) (reconcile.Result, error) {
if err := extensionscontroller.EnsureFinalizer(ctx, r.client, FinalizerName, osc); err != nil {
return reconcile.Result{}, err
}
if err := r.updateStatusProcessing(ctx, osc, operationType, "Reconciling the operating system config"); err != nil {
return reconcile.Result{}, err
}
userData, command, units, err := r.actuator.Reconcile(ctx, osc)
if err != nil {
utilruntime.HandleError(r.updateStatusError(ctx, extensionscontroller.ReconcileErrCauseOrErr(err), osc, operationType, "Error reconciling operating system config"))
return extensionscontroller.ReconcileErr(err)
}
secret, err := r.createOrUpdateOSCResultSecret(ctx, osc, userData)
if err != nil {
utilruntime.HandleError(r.updateStatusError(ctx, extensionscontroller.ReconcileErrCauseOrErr(err), osc, operationType, "Could not apply secret for generated cloud config"))
return extensionscontroller.ReconcileErr(err)
}
setOSCStatus(osc, secret, command, units)
if err := r.updateStatusSuccess(ctx, osc, operationType, "Successfully reconciled operating system config"); err != nil {
return reconcile.Result{}, err
}
return reconcile.Result{}, nil
}
func (r *reconciler) restore(ctx context.Context, osc *extensionsv1alpha1.OperatingSystemConfig) (reconcile.Result, error) {
if err := extensionscontroller.EnsureFinalizer(ctx, r.client, FinalizerName, osc); err != nil {
return reconcile.Result{}, err
}
if err := r.updateStatusProcessing(ctx, osc, gardencorev1beta1.LastOperationTypeRestore, "Restoring the operating system config"); err != nil {
return reconcile.Result{}, err
}
userData, command, units, err := r.actuator.Restore(ctx, osc)
if err != nil {
utilruntime.HandleError(r.updateStatusError(ctx, extensionscontroller.ReconcileErrCauseOrErr(err), osc, gardencorev1beta1.LastOperationTypeRestore, "Error restoring operating system config"))
return extensionscontroller.ReconcileErr(err)
}
secret, err := r.createOrUpdateOSCResultSecret(ctx, osc, userData)
if err != nil {
utilruntime.HandleError(r.updateStatusError(ctx, extensionscontroller.ReconcileErrCauseOrErr(err), osc, gardencorev1beta1.LastOperationTypeRestore, "Could not apply secret for generated cloud config"))
return extensionscontroller.ReconcileErr(err)
}
setOSCStatus(osc, secret, command, units)
if err := r.updateStatusSuccess(ctx, osc, gardencorev1beta1.LastOperationTypeRestore, "Successfully restored operating system config"); err != nil {
return reconcile.Result{}, err
}
if err := extensionscontroller.RemoveAnnotation(ctx, r.client, osc, v1beta1constants.GardenerOperation); err != nil {
return reconcile.Result{}, fmt.Errorf("error removing annotation from OperationSystemConfig: %+v", err)
}
return reconcile.Result{}, nil
}
func (r *reconciler) delete(ctx context.Context, osc *extensionsv1alpha1.OperatingSystemConfig) (reconcile.Result, error) {
hasFinalizer, err := extensionscontroller.HasFinalizer(osc, FinalizerName)
if err != nil {
return reconcile.Result{}, fmt.Errorf("could not instantiate finalizer deletion: %+v", err)
}
if !hasFinalizer {
r.logger.Info("Deleting operating system config causes a no-op as there is no finalizer.", "osc", osc.Name)
return reconcile.Result{}, nil
}
if err := r.updateStatusProcessing(ctx, osc, gardencorev1beta1.LastOperationTypeDelete, "Deleting the operating system config"); err != nil {
return reconcile.Result{}, err
}
if err := r.actuator.Delete(ctx, osc); err != nil {
utilruntime.HandleError(r.updateStatusError(ctx, extensionscontroller.ReconcileErrCauseOrErr(err), osc, gardencorev1beta1.LastOperationTypeDelete, "Error deleting operating system config"))
return extensionscontroller.ReconcileErr(err)
}
if err := r.updateStatusSuccess(ctx, osc, gardencorev1beta1.LastOperationTypeDelete, "Successfully deleted operating system config"); err != nil {
return reconcile.Result{}, err
}
r.logger.Info("Removing finalizer.", "osc", osc.Name)
if err := extensionscontroller.DeleteFinalizer(ctx, r.client, FinalizerName, osc); err != nil {
return reconcile.Result{}, fmt.Errorf("error removing finalizer from OperationSystemConfig: %+v", err)
}
return reconcile.Result{}, nil
}
func (r *reconciler) migrate(ctx context.Context, osc *extensionsv1alpha1.OperatingSystemConfig) (reconcile.Result, error) {
hasFinalizer, err := extensionscontroller.HasFinalizer(osc, FinalizerName)
if err != nil {
return reconcile.Result{}, fmt.Errorf("could not instantiate finalizer deletion: %+v", err)
}
if !hasFinalizer {
r.logger.Info("Migrating operating system config causes a no-op as there is no finalizer.", "osc", osc.Name)
return reconcile.Result{}, nil
}
if err := r.updateStatusProcessing(ctx, osc, gardencorev1beta1.LastOperationTypeMigrate, "Migrating the operating system config"); err != nil {
return reconcile.Result{}, err
}
if err := r.actuator.Migrate(ctx, osc); err != nil {
utilruntime.HandleError(r.updateStatusError(ctx, extensionscontroller.ReconcileErrCauseOrErr(err), osc, gardencorev1beta1.LastOperationTypeMigrate, "Error migrating operating system config"))
return extensionscontroller.ReconcileErr(err)
}
if err := r.updateStatusSuccess(ctx, osc, gardencorev1beta1.LastOperationTypeMigrate, "Successfully migrated operating system config"); err != nil {
return reconcile.Result{}, err
}
r.logger.Info("Removing finalizer.", "osc", osc.Name)
if err := extensionscontroller.DeleteAllFinalizers(ctx, r.client, osc); err != nil {
return reconcile.Result{}, fmt.Errorf("Error removing all finalizers from OperationSystemConfig: %+v", err)
}
if err := extensionscontroller.RemoveAnnotation(ctx, r.client, osc, v1beta1constants.GardenerOperation); err != nil {
return reconcile.Result{}, fmt.Errorf("error removing annotation from OperationSystemConfig: %+v", err)
}
return reconcile.Result{}, nil
}
func (r *reconciler) updateStatusProcessing(ctx context.Context, osc *extensionsv1alpha1.OperatingSystemConfig, lastOperationType gardencorev1beta1.LastOperationType, description string) error {
r.logger.Info(description, "osc", osc.Name)
osc.Status.LastOperation = extensionscontroller.LastOperation(lastOperationType, gardencorev1beta1.LastOperationStateProcessing, 1, description)
return r.client.Status().Update(ctx, osc)
}
func (r *reconciler) updateStatusError(ctx context.Context, err error, osc *extensionsv1alpha1.OperatingSystemConfig, lastOperationType gardencorev1beta1.LastOperationType, description string) error {
osc.Status.ObservedGeneration = osc.Generation
osc.Status.LastOperation, osc.Status.LastError = extensionscontroller.ReconcileError(lastOperationType, gardencorev1beta1helper.FormatLastErrDescription(fmt.Errorf("%s: %v", description, err)), 50, gardencorev1beta1helper.ExtractErrorCodes(err)...)
return r.client.Status().Update(ctx, osc)
}
func (r *reconciler) updateStatusSuccess(ctx context.Context, osc *extensionsv1alpha1.OperatingSystemConfig, lastOperationType gardencorev1beta1.LastOperationType, description string) error {
r.logger.Info(description, "osc", osc.Name)
osc.Status.ObservedGeneration = osc.Generation
osc.Status.LastOperation, osc.Status.LastError = extensionscontroller.ReconcileSucceeded(lastOperationType, description)
return r.client.Status().Update(ctx, osc)
}
func (r *reconciler) createOrUpdateOSCResultSecret(ctx context.Context, osc *extensionsv1alpha1.OperatingSystemConfig, userData []byte) (*corev1.Secret, error) {
secret := &corev1.Secret{ObjectMeta: SecretObjectMetaForConfig(osc)}
if _, err := controllerutil.CreateOrUpdate(ctx, r.client, secret, func() error {
if secret.Data == nil {
secret.Data = make(map[string][]byte)
}
secret.Data[extensionsv1alpha1.OperatingSystemConfigSecretDataKey] = userData
return controllerutil.SetControllerReference(osc, secret, r.scheme)
}); err != nil {
return nil, err
}
return secret, nil
}
func setOSCStatus(osc *extensionsv1alpha1.OperatingSystemConfig, secret *corev1.Secret, command *string, units []string) {
osc.Status.CloudConfig = &extensionsv1alpha1.CloudConfig{
SecretRef: corev1.SecretReference{
Name: secret.Name,
Namespace: secret.Namespace,
},
}
osc.Status.Units = units
if command != nil {
osc.Status.Command = command
}
}