/
backup_bucket_actuator.go
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/
backup_bucket_actuator.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 backupbucket
import (
"context"
"fmt"
"strings"
"time"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"
"github.com/gardener/gardener/pkg/controllerutils"
"github.com/gardener/gardener/pkg/operation/common"
"github.com/gardener/gardener/pkg/utils/flow"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/sirupsen/logrus"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/sets"
kretry "k8s.io/client-go/util/retry"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
)
const (
defaultTimeout = 30 * time.Second
defaultInterval = 5 * time.Second
)
// Actuator acts upon BackupBucket resources.
type Actuator interface {
// Reconcile reconciles the BackupBucket.
Reconcile(context.Context) error
// Delete deletes the BackupBucket.
Delete(context.Context) error
}
type actuator struct {
gardenClient client.Client
seedClient client.Client
logger *logrus.Entry
backupBucket *gardencorev1beta1.BackupBucket
}
func newActuator(gardenClient, seedClient client.Client, bb *gardencorev1beta1.BackupBucket, logger logrus.FieldLogger) Actuator {
return &actuator{
logger: logger.WithField("backupbucket", bb.Name),
backupBucket: bb,
gardenClient: gardenClient,
seedClient: seedClient,
}
}
func (a *actuator) Reconcile(ctx context.Context) error {
var (
g = flow.NewGraph("Backup Bucket Reconciliation")
deployBackupBucketExtension = g.Add(flow.Task{
Name: "Deploying backup bucket extension resource",
Fn: flow.TaskFn(a.deployBackupBucketExtension).RetryUntilTimeout(defaultInterval, defaultTimeout),
})
_ = g.Add(flow.Task{
Name: "Waiting until backup bucket is reconciled",
Fn: flow.TaskFn(a.waitUntilBackupBucketExtensionReconciled),
Dependencies: flow.NewTaskIDs(deployBackupBucketExtension),
})
f = g.Compile()
)
return f.Run(flow.Opts{
Logger: a.logger,
ProgressReporter: a.reportBackupBucketProgress,
Context: ctx,
})
}
func (a *actuator) Delete(ctx context.Context) error {
var (
g = flow.NewGraph("Backup bucket deletion")
deleteBackupBucket = g.Add(flow.Task{
Name: "Destroying backup bucket",
Fn: flow.TaskFn(a.deleteBackupBucketExtension),
})
_ = g.Add(flow.Task{
Name: "Waiting until extension backup bucket is deleted",
Fn: flow.TaskFn(a.waitUntilBackupBucketExtensionDeleted),
Dependencies: flow.NewTaskIDs(deleteBackupBucket),
})
f = g.Compile()
)
return f.Run(flow.Opts{
Logger: a.logger,
ProgressReporter: a.reportBackupBucketProgress,
Context: ctx,
})
}
// reportBackupBucketProgress will update the phase and error in the BackupBucket manifest `status` section
// by the current progress of the Flow execution.
func (a *actuator) reportBackupBucketProgress(ctx context.Context, stats *flow.Stats) {
if err := kutil.TryUpdateStatus(ctx, kretry.DefaultRetry, a.gardenClient, a.backupBucket, func() error {
a.backupBucket.Status.LastOperation.Description = makeDescription(stats)
a.backupBucket.Status.LastOperation.Progress = stats.ProgressPercent()
a.backupBucket.Status.LastOperation.LastUpdateTime = metav1.Now()
return nil
}); err != nil {
a.logger.Warnf("could not report backupbucket progress with description: %s", makeDescription(stats))
}
}
func makeDescription(stats *flow.Stats) string {
if stats.ProgressPercent() == 100 {
return "Execution finished"
}
return strings.Join(stats.Running.StringList(), ", ")
}
// deployBackupBucketExtension deploys the BackupBucket extension resource in Seed with the required secret.
func (a *actuator) deployBackupBucketExtension(ctx context.Context) error {
coreSecret, err := common.GetSecretFromSecretRef(ctx, a.gardenClient, &a.backupBucket.Spec.SecretRef)
if err != nil {
return err
}
extensionSecret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: generateBackupBucketSecretName(a.backupBucket.Name),
Namespace: v1beta1constants.GardenNamespace,
},
}
if _, err := controllerutil.CreateOrUpdate(ctx, a.seedClient, extensionSecret, func() error {
extensionSecret.Data = coreSecret.DeepCopy().Data
return nil
}); err != nil {
return err
}
// create extension backup bucket resource in seed
extensionBackupBucket := &extensionsv1alpha1.BackupBucket{
ObjectMeta: metav1.ObjectMeta{
Name: a.backupBucket.Name,
},
}
var providerConfig *runtime.RawExtension
if a.backupBucket.Spec.ProviderConfig != nil {
providerConfig = &a.backupBucket.Spec.ProviderConfig.RawExtension
}
_, err = controllerutil.CreateOrUpdate(ctx, a.seedClient, extensionBackupBucket, func() error {
metav1.SetMetaDataAnnotation(&extensionBackupBucket.ObjectMeta, v1beta1constants.GardenerOperation, v1beta1constants.GardenerOperationReconcile)
extensionBackupBucket.Spec = extensionsv1alpha1.BackupBucketSpec{
DefaultSpec: extensionsv1alpha1.DefaultSpec{
Type: a.backupBucket.Spec.Provider.Type,
ProviderConfig: providerConfig,
},
Region: a.backupBucket.Spec.Provider.Region,
SecretRef: corev1.SecretReference{
Name: generateBackupBucketSecretName(a.backupBucket.Name),
Namespace: v1beta1constants.GardenNamespace,
},
}
return nil
})
return err
}
// waitUntilBackupBucketExtensionReconciled waits until BackupBucket Extension resource reconciled from seed.
// It also copies the generatedSecret from seed to garden.
func (a *actuator) waitUntilBackupBucketExtensionReconciled(ctx context.Context) error {
return common.WaitUntilExtensionCRReady(
ctx,
a.seedClient,
a.logger,
func() runtime.Object { return &extensionsv1alpha1.BackupBucket{} },
"BackupBucket",
"",
a.backupBucket.Name,
defaultInterval,
defaultTimeout,
func(obj runtime.Object) error {
backupBucket, ok := obj.(*extensionsv1alpha1.BackupBucket)
if !ok {
return fmt.Errorf("expected extensionsv1alpha1.BackupBucket but got %T", backupBucket)
}
var (
generatedSecretRef *corev1.SecretReference
providerStatus *gardencorev1beta1.ProviderConfig
)
if backupBucket.Status.GeneratedSecretRef != nil {
generatedSecret, err := common.GetSecretFromSecretRef(ctx, a.seedClient, backupBucket.Status.GeneratedSecretRef)
if err != nil {
return err
}
coreGeneratedSecret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: generateGeneratedBackupBucketSecretName(a.backupBucket.Name),
Namespace: v1beta1constants.GardenNamespace,
},
}
ownerRef := metav1.NewControllerRef(backupBucket, gardencorev1beta1.SchemeGroupVersion.WithKind("BackupBucket"))
if _, err := controllerutil.CreateOrUpdate(ctx, a.gardenClient, coreGeneratedSecret, func() error {
coreGeneratedSecret.OwnerReferences = []metav1.OwnerReference{*ownerRef}
coreGeneratedSecret.Data = generatedSecret.DeepCopy().Data
finalizers := sets.NewString(coreGeneratedSecret.GetFinalizers()...)
finalizers.Insert(finalizerName)
coreGeneratedSecret.SetFinalizers(finalizers.UnsortedList())
return nil
}); err != nil {
return err
}
generatedSecretRef = &corev1.SecretReference{
Name: coreGeneratedSecret.Name,
Namespace: coreGeneratedSecret.Namespace,
}
}
if backupBucket.Status.ProviderStatus != nil {
providerStatus = &gardencorev1beta1.ProviderConfig{
RawExtension: *backupBucket.Status.ProviderStatus,
}
}
if generatedSecretRef != nil || providerStatus != nil {
_, err := controllerutil.CreateOrUpdate(ctx, a.gardenClient, a.backupBucket, func() error {
a.backupBucket.Status.GeneratedSecretRef = generatedSecretRef
a.backupBucket.Status.ProviderStatus = providerStatus
return nil
})
return err
}
return nil
},
)
}
// deleteBackupBucketExtension deletes BackupBucket extension resource in seed.
func (a *actuator) deleteBackupBucketExtension(ctx context.Context) error {
if err := a.deleteGeneratedBackupBucketSecretInGarden(ctx); err != nil {
return err
}
if err := a.deleteBackupBucketExtensionSecret(ctx); err != nil {
return err
}
return common.DeleteExtensionCR(
ctx,
a.seedClient,
func() extensionsv1alpha1.Object { return &extensionsv1alpha1.BackupBucket{} },
"",
a.backupBucket.Name,
)
}
// waitUntilBackupBucketExtensionDeleted waits until backup bucket extension resource is deleted in seed cluster.
func (a *actuator) waitUntilBackupBucketExtensionDeleted(ctx context.Context) error {
return common.WaitUntilExtensionCRDeleted(
ctx,
a.seedClient,
a.logger,
func() extensionsv1alpha1.Object { return &extensionsv1alpha1.BackupBucket{} },
"BackupBucket",
"",
a.backupBucket.Name,
defaultInterval,
defaultTimeout,
)
}
// deleteBackupBucketExtensionSecret deletes secret referred by BackupBucket extension resource in seed.
func (a *actuator) deleteBackupBucketExtensionSecret(ctx context.Context) error {
secret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: generateBackupBucketSecretName(a.backupBucket.Name),
Namespace: v1beta1constants.GardenNamespace,
},
}
return client.IgnoreNotFound(a.seedClient.Delete(ctx, secret))
}
// deleteGeneratedBackupBucketSecretInGarden deletes generated secret referred by core BackupBucket resource in garden.
func (a *actuator) deleteGeneratedBackupBucketSecretInGarden(ctx context.Context) error {
if a.backupBucket.Status.GeneratedSecretRef == nil {
return nil
}
secret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: a.backupBucket.Status.GeneratedSecretRef.Name,
Namespace: a.backupBucket.Status.GeneratedSecretRef.Namespace,
},
}
if err := controllerutils.RemoveFinalizer(ctx, a.gardenClient, secret, finalizerName); err != nil {
return err
}
return client.IgnoreNotFound(a.gardenClient.Delete(ctx, secret))
}
func generateBackupBucketSecretName(backupBucketName string) string {
return fmt.Sprintf("bucket-%s", backupBucketName)
}
func generateGeneratedBackupBucketSecretName(backupBucketName string) string {
return fmt.Sprintf("generated-bucket-%s", backupBucketName)
}