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strategy.go
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strategy.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"
apiequality "k8s.io/apimachinery/pkg/api/equality"
"k8s.io/apimachinery/pkg/fields"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/util/validation/field"
"k8s.io/apiserver/pkg/registry/generic"
"k8s.io/apiserver/pkg/storage"
"k8s.io/apiserver/pkg/storage/names"
"github.com/gardener/gardener/pkg/api"
"github.com/gardener/gardener/pkg/apis/core"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/apis/core/validation"
kubernetesutils "github.com/gardener/gardener/pkg/utils/kubernetes"
)
type backupBucketStrategy struct {
runtime.ObjectTyper
names.NameGenerator
}
// Strategy defines the storage strategy for BackupBuckets.
var Strategy = backupBucketStrategy{api.Scheme, names.SimpleNameGenerator}
func (backupBucketStrategy) NamespaceScoped() bool {
return false
}
func (backupBucketStrategy) PrepareForCreate(ctx context.Context, obj runtime.Object) {
backupBucket := obj.(*core.BackupBucket)
backupBucket.Generation = 1
backupBucket.Status = core.BackupBucketStatus{}
}
func (backupBucketStrategy) PrepareForUpdate(ctx context.Context, obj, old runtime.Object) {
newBackupBucket := obj.(*core.BackupBucket)
oldBackupBucket := old.(*core.BackupBucket)
newBackupBucket.Status = oldBackupBucket.Status
if mustIncreaseGeneration(oldBackupBucket, newBackupBucket) {
newBackupBucket.Generation = oldBackupBucket.Generation + 1
}
}
func mustIncreaseGeneration(oldBackupBucket, newBackupBucket *core.BackupBucket) bool {
// The BackupBucket specification changes.
if !apiequality.Semantic.DeepEqual(oldBackupBucket.Spec, newBackupBucket.Spec) {
return true
}
// The deletion timestamp was set.
if oldBackupBucket.DeletionTimestamp == nil && newBackupBucket.DeletionTimestamp != nil {
return true
}
if kubernetesutils.HasMetaDataAnnotation(&newBackupBucket.ObjectMeta, v1beta1constants.GardenerOperation, v1beta1constants.GardenerOperationReconcile) {
delete(newBackupBucket.Annotations, v1beta1constants.GardenerOperation)
return true
}
return false
}
func (backupBucketStrategy) Validate(ctx context.Context, obj runtime.Object) field.ErrorList {
backupBucket := obj.(*core.BackupBucket)
return validation.ValidateBackupBucket(backupBucket)
}
func (backupBucketStrategy) Canonicalize(obj runtime.Object) {
}
func (backupBucketStrategy) AllowCreateOnUpdate() bool {
return false
}
func (backupBucketStrategy) ValidateUpdate(ctx context.Context, newObj, oldObj runtime.Object) field.ErrorList {
oldBackupBucket, newBackupBucket := oldObj.(*core.BackupBucket), newObj.(*core.BackupBucket)
return validation.ValidateBackupBucketUpdate(newBackupBucket, oldBackupBucket)
}
func (backupBucketStrategy) AllowUnconditionalUpdate() bool {
return false
}
// WarningsOnCreate returns warnings to the client performing a create.
func (backupBucketStrategy) WarningsOnCreate(ctx context.Context, obj runtime.Object) []string {
return nil
}
// WarningsOnUpdate returns warnings to the client performing the update.
func (backupBucketStrategy) WarningsOnUpdate(ctx context.Context, obj, old runtime.Object) []string {
return nil
}
type backupBucketStatusStrategy struct {
backupBucketStrategy
}
// StatusStrategy defines the storage strategy for the status subresource of BackupBuckets.
var StatusStrategy = backupBucketStatusStrategy{Strategy}
func (backupBucketStatusStrategy) PrepareForUpdate(ctx context.Context, obj, old runtime.Object) {
newBackupBucket := obj.(*core.BackupBucket)
oldBackupBucket := old.(*core.BackupBucket)
newBackupBucket.Spec = oldBackupBucket.Spec
}
func (backupBucketStatusStrategy) ValidateUpdate(ctx context.Context, obj, old runtime.Object) field.ErrorList {
return validation.ValidateBackupBucketStatusUpdate(obj.(*core.BackupBucket), old.(*core.BackupBucket))
}
// ToSelectableFields returns a field set that represents the object
// TODO: fields are not labels, and the validation rules for them do not apply.
func ToSelectableFields(backupBucket *core.BackupBucket) fields.Set {
// The purpose of allocation with a given number of elements is to reduce
// amount of allocations needed to create the fields.Set. If you add any
// field here or the number of object-meta related fields changes, this should
// be adjusted.
backupBucketSpecificFieldsSet := make(fields.Set, 3)
backupBucketSpecificFieldsSet[core.BackupBucketSeedName] = getSeedName(backupBucket)
return generic.AddObjectMetaFieldsSet(backupBucketSpecificFieldsSet, &backupBucket.ObjectMeta, true)
}
// GetAttrs returns labels and fields of a given object for filtering purposes.
func GetAttrs(obj runtime.Object) (labels.Set, fields.Set, error) {
backupBucket, ok := obj.(*core.BackupBucket)
if !ok {
return nil, nil, fmt.Errorf("not a backupBucket")
}
return labels.Set(backupBucket.ObjectMeta.Labels), ToSelectableFields(backupBucket), nil
}
// MatchBackupBucket returns a generic matcher for a given label and field selector.
func MatchBackupBucket(label labels.Selector, field fields.Selector) storage.SelectionPredicate {
return storage.SelectionPredicate{
Label: label,
Field: field,
GetAttrs: GetAttrs,
IndexFields: []string{core.BackupBucketSeedName},
}
}
// SeedNameTriggerFunc returns spec.seedName of given BackupBucket.
func SeedNameTriggerFunc(obj runtime.Object) string {
backupBucket, ok := obj.(*core.BackupBucket)
if !ok {
return ""
}
return getSeedName(backupBucket)
}
func getSeedName(backupBucket *core.BackupBucket) string {
if backupBucket.Spec.SeedName == nil {
return ""
}
return *backupBucket.Spec.SeedName
}