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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 backupentry
import (
"context"
"fmt"
"strconv"
"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"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
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"
)
type backupEntryStrategy struct {
runtime.ObjectTyper
names.NameGenerator
}
// Strategy defines the storage strategy for BackupEntries.
var Strategy = backupEntryStrategy{api.Scheme, names.SimpleNameGenerator}
func (backupEntryStrategy) NamespaceScoped() bool {
return true
}
func (backupEntryStrategy) PrepareForCreate(ctx context.Context, obj runtime.Object) {
backupEntry := obj.(*core.BackupEntry)
backupEntry.Generation = 1
backupEntry.Status = core.BackupEntryStatus{}
}
func (backupEntryStrategy) PrepareForUpdate(ctx context.Context, obj, old runtime.Object) {
newBackupEntry := obj.(*core.BackupEntry)
oldBackupEntry := old.(*core.BackupEntry)
newBackupEntry.Status = oldBackupEntry.Status
if mustIncreaseGeneration(oldBackupEntry, newBackupEntry) {
newBackupEntry.Generation = oldBackupEntry.Generation + 1
}
}
func mustIncreaseGeneration(oldBackupEntry, newBackupEntry *core.BackupEntry) bool {
// The BackupEntry specification changes.
if !apiequality.Semantic.DeepEqual(oldBackupEntry.Spec, newBackupEntry.Spec) {
return true
}
// The deletion timestamp was set.
if oldBackupEntry.DeletionTimestamp == nil && newBackupEntry.DeletionTimestamp != nil {
return true
}
oldPresent, _ := strconv.ParseBool(oldBackupEntry.ObjectMeta.Annotations[core.BackupEntryForceDeletion])
newPresent, _ := strconv.ParseBool(newBackupEntry.ObjectMeta.Annotations[core.BackupEntryForceDeletion])
if oldPresent != newPresent && newPresent {
return true
}
if kutil.HasMetaDataAnnotation(&newBackupEntry.ObjectMeta, v1beta1constants.GardenerOperation, v1beta1constants.GardenerOperationReconcile) {
return true
}
return false
}
func (backupEntryStrategy) Validate(ctx context.Context, obj runtime.Object) field.ErrorList {
backupEntry := obj.(*core.BackupEntry)
return validation.ValidateBackupEntry(backupEntry)
}
func (backupEntryStrategy) Canonicalize(obj runtime.Object) {
}
func (backupEntryStrategy) AllowCreateOnUpdate() bool {
return false
}
func (backupEntryStrategy) ValidateUpdate(ctx context.Context, newObj, oldObj runtime.Object) field.ErrorList {
oldBackupEntry, newBackupEntry := oldObj.(*core.BackupEntry), newObj.(*core.BackupEntry)
return validation.ValidateBackupEntryUpdate(newBackupEntry, oldBackupEntry)
}
func (backupEntryStrategy) AllowUnconditionalUpdate() bool {
return false
}
type backupEntryStatusStrategy struct {
backupEntryStrategy
}
// StatusStrategy defines the storage strategy for the status subresource of BackupEntries.
var StatusStrategy = backupEntryStatusStrategy{Strategy}
func (backupEntryStatusStrategy) PrepareForUpdate(ctx context.Context, obj, old runtime.Object) {
newBackupEntry := obj.(*core.BackupEntry)
oldBackupEntry := old.(*core.BackupEntry)
newBackupEntry.Spec = oldBackupEntry.Spec
}
func (backupEntryStatusStrategy) ValidateUpdate(ctx context.Context, obj, old runtime.Object) field.ErrorList {
return validation.ValidateBackupEntryStatusUpdate(obj.(*core.BackupEntry), old.(*core.BackupEntry))
}
// 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(backupEntry *core.BackupEntry) 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.
backupEntrySpecificFieldsSet := make(fields.Set, 3)
backupEntrySpecificFieldsSet[core.BackupEntrySeedName] = getSeedName(backupEntry)
return generic.AddObjectMetaFieldsSet(backupEntrySpecificFieldsSet, &backupEntry.ObjectMeta, true)
}
// GetAttrs returns labels and fields of a given object for filtering purposes.
func GetAttrs(obj runtime.Object) (labels.Set, fields.Set, error) {
backupEntry, ok := obj.(*core.BackupEntry)
if !ok {
return nil, nil, fmt.Errorf("not a backupEntry")
}
return labels.Set(backupEntry.ObjectMeta.Labels), ToSelectableFields(backupEntry), nil
}
// MatchBackupEntry returns a generic matcher for a given label and field selector.
func MatchBackupEntry(label labels.Selector, field fields.Selector) storage.SelectionPredicate {
return storage.SelectionPredicate{
Label: label,
Field: field,
GetAttrs: GetAttrs,
IndexFields: []string{core.BackupEntrySeedName},
}
}
// SeedNameTriggerFunc returns spec.seedName of given BackupEntry.
func SeedNameTriggerFunc(obj runtime.Object) string {
backupEntry, ok := obj.(*core.BackupEntry)
if !ok {
return ""
}
return getSeedName(backupEntry)
}
func getSeedName(backupEntry *core.BackupEntry) string {
if backupEntry.Spec.SeedName == nil {
return ""
}
return *backupEntry.Spec.SeedName
}