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managedseed_reconciler.go
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managedseed_reconciler.go
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// Copyright (c) 2021 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 managedseed
import (
"context"
"fmt"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
seedmanagementv1alpha1 "github.com/gardener/gardener/pkg/apis/seedmanagement/v1alpha1"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/controllerutils"
"github.com/gardener/gardener/pkg/gardenlet/apis/config"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
"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/reconcile"
)
// reconciler implements the reconcile.Reconciler interface for ManagedSeed reconciliation.
type reconciler struct {
gardenClient kubernetes.Interface
actuator Actuator
cfg *config.ManagedSeedControllerConfiguration
}
// newReconciler creates a new ManagedSeed reconciler with the given parameters.
func newReconciler(gardenClient kubernetes.Interface, actuator Actuator, cfg *config.ManagedSeedControllerConfiguration) reconcile.Reconciler {
return &reconciler{
gardenClient: gardenClient,
actuator: actuator,
cfg: cfg,
}
}
func (r *reconciler) Reconcile(ctx context.Context, request reconcile.Request) (reconcile.Result, error) {
log := logf.FromContext(ctx)
ms := &seedmanagementv1alpha1.ManagedSeed{}
if err := r.gardenClient.Client().Get(ctx, request.NamespacedName, ms); 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)
}
if ms.DeletionTimestamp != nil {
return r.delete(ctx, log, ms)
}
return r.reconcile(ctx, log, ms)
}
func (r *reconciler) reconcile(
ctx context.Context,
log logr.Logger,
ms *seedmanagementv1alpha1.ManagedSeed,
) (
result reconcile.Result,
err error,
) {
// Ensure gardener finalizer
if !controllerutil.ContainsFinalizer(ms, gardencorev1beta1.GardenerName) {
log.Info("Adding finalizer")
if err := controllerutils.AddFinalizers(ctx, r.gardenClient.Client(), ms, gardencorev1beta1.GardenerName); err != nil {
return reconcile.Result{}, fmt.Errorf("failed to add finalizer: %w", err)
}
return reconcile.Result{}, nil
}
var status *seedmanagementv1alpha1.ManagedSeedStatus
defer func() {
// Update status, on failure return the update error unless there is another error
if updateErr := r.updateStatus(ctx, ms, status); updateErr != nil && err == nil {
err = fmt.Errorf("could not update status: %w", updateErr)
}
}()
// Reconcile creation or update
log.V(1).Info("Reconciling")
var wait bool
if status, wait, err = r.actuator.Reconcile(ctx, log, ms); err != nil {
return reconcile.Result{}, fmt.Errorf("could not reconcile ManagedSeed %s creation or update: %w", kutil.ObjectName(ms), err)
}
log.V(1).Info("Reconciliation finished")
// If waiting, requeue after WaitSyncPeriod
if wait {
return reconcile.Result{RequeueAfter: r.cfg.WaitSyncPeriod.Duration}, nil
}
// Return success result
return reconcile.Result{RequeueAfter: r.cfg.SyncPeriod.Duration}, nil
}
func (r *reconciler) delete(
ctx context.Context,
log logr.Logger,
ms *seedmanagementv1alpha1.ManagedSeed,
) (
result reconcile.Result,
err error,
) {
// Check gardener finalizer
if !controllerutil.ContainsFinalizer(ms, gardencorev1beta1.GardenerName) {
log.V(1).Info("Skipping deletion as object does not have a finalizer")
return reconcile.Result{}, nil
}
var status *seedmanagementv1alpha1.ManagedSeedStatus
var wait, removeFinalizer bool
defer func() {
// Only update status if the finalizer is not removed to prevent errors if the object is already gone
if !removeFinalizer {
// Update status, on failure return the update error unless there is another error
if updateErr := r.updateStatus(ctx, ms, status); updateErr != nil && err == nil {
err = fmt.Errorf("could not update status: %w", updateErr)
}
}
}()
// Reconcile deletion
log.V(1).Info("Deletion")
if status, wait, removeFinalizer, err = r.actuator.Delete(ctx, log, ms); err != nil {
return reconcile.Result{}, fmt.Errorf("could not reconcile ManagedSeed %s deletion: %w", kutil.ObjectName(ms), err)
}
log.V(1).Info("Deletion finished")
// If waiting, requeue after WaitSyncPeriod
if wait {
return reconcile.Result{RequeueAfter: r.cfg.WaitSyncPeriod.Duration}, nil
}
// Remove gardener finalizer if requested by the actuator
if removeFinalizer {
if controllerutil.ContainsFinalizer(ms, gardencorev1beta1.GardenerName) {
log.Info("Removing finalizer")
if err := controllerutils.RemoveFinalizers(ctx, r.gardenClient.Client(), ms, gardencorev1beta1.GardenerName); err != nil {
return reconcile.Result{}, fmt.Errorf("failed to remove finalizer: %w", err)
}
}
return reconcile.Result{}, nil
}
// Return success result
return reconcile.Result{RequeueAfter: r.cfg.SyncPeriod.Duration}, nil
}
func (r *reconciler) updateStatus(ctx context.Context, ms *seedmanagementv1alpha1.ManagedSeed, status *seedmanagementv1alpha1.ManagedSeedStatus) error {
if status == nil {
return nil
}
patch := client.StrategicMergeFrom(ms.DeepCopy())
ms.Status = *status
return r.gardenClient.Client().Status().Patch(ctx, ms, patch)
}