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strategy.go
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strategy.go
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// Copyright 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"
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"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/apis/seedmanagement"
"github.com/gardener/gardener/pkg/apis/seedmanagement/validation"
kubernetesutils "github.com/gardener/gardener/pkg/utils/kubernetes"
)
// Strategy defines the strategy for storing managedseeds.
type Strategy struct {
runtime.ObjectTyper
names.NameGenerator
}
// NewStrategy defines the storage strategy for ManagedSeeds.
func NewStrategy() Strategy {
return Strategy{api.Scheme, names.SimpleNameGenerator}
}
// NamespaceScoped returns true if the object must be within a namespace.
func (Strategy) NamespaceScoped() bool {
return true
}
// PrepareForCreate mutates some fields in the object before it's created.
func (s Strategy) PrepareForCreate(ctx context.Context, obj runtime.Object) {
managedSeed := obj.(*seedmanagement.ManagedSeed)
managedSeed.Generation = 1
managedSeed.Status = seedmanagement.ManagedSeedStatus{}
}
// PrepareForUpdate is invoked on update before validation to normalize
// the object. For example: remove fields that are not to be persisted,
// sort order-insensitive list fields, etc. This should not remove fields
// whose presence would be considered a validation error.
func (s Strategy) PrepareForUpdate(ctx context.Context, obj, old runtime.Object) {
newManagedSeed := obj.(*seedmanagement.ManagedSeed)
oldManagedSeed := old.(*seedmanagement.ManagedSeed)
newManagedSeed.Status = oldManagedSeed.Status
if mustIncreaseGeneration(oldManagedSeed, newManagedSeed) {
newManagedSeed.Generation = oldManagedSeed.Generation + 1
}
}
func mustIncreaseGeneration(oldManagedSeed, newManagedSeed *seedmanagement.ManagedSeed) bool {
// The spec changed
if !apiequality.Semantic.DeepEqual(oldManagedSeed.Spec, newManagedSeed.Spec) {
return true
}
// The deletion timestamp was set
if oldManagedSeed.DeletionTimestamp == nil && newManagedSeed.DeletionTimestamp != nil {
return true
}
// The operation annotation was added with value "reconcile"
if kubernetesutils.HasMetaDataAnnotation(&newManagedSeed.ObjectMeta, v1beta1constants.GardenerOperation, v1beta1constants.GardenerOperationReconcile) {
delete(newManagedSeed.Annotations, v1beta1constants.GardenerOperation)
return true
}
// The operation annotation was added with value "renew-kubeconfig"
if kubernetesutils.HasMetaDataAnnotation(&newManagedSeed.ObjectMeta, v1beta1constants.GardenerOperation, v1beta1constants.GardenerOperationRenewKubeconfig) {
return true
}
return false
}
// Validate validates the given object.
func (Strategy) Validate(ctx context.Context, obj runtime.Object) field.ErrorList {
managedSeed := obj.(*seedmanagement.ManagedSeed)
return validation.ValidateManagedSeed(managedSeed)
}
// Canonicalize allows an object to be mutated into a canonical form. This
// ensures that code that operates on these objects can rely on the common
// form for things like comparison. Canonicalize is invoked after
// validation has succeeded but before the object has been persisted.
// This method may mutate the object.
func (Strategy) Canonicalize(obj runtime.Object) {
}
// AllowCreateOnUpdate returns true if the object can be created by a PUT.
func (Strategy) AllowCreateOnUpdate() bool {
return false
}
// AllowUnconditionalUpdate returns true if the object can be updated
// unconditionally (irrespective of the latest resource version), when
// there is no resource version specified in the object.
func (Strategy) AllowUnconditionalUpdate() bool {
return false
}
// ValidateUpdate validates the update on the given old and new object.
func (Strategy) ValidateUpdate(ctx context.Context, newObj, oldObj runtime.Object) field.ErrorList {
oldManagedSeed, newManagedSeed := oldObj.(*seedmanagement.ManagedSeed), newObj.(*seedmanagement.ManagedSeed)
return validation.ValidateManagedSeedUpdate(newManagedSeed, oldManagedSeed)
}
// WarningsOnCreate returns warnings to the client performing a create.
func (Strategy) WarningsOnCreate(ctx context.Context, obj runtime.Object) []string {
return nil
}
// WarningsOnUpdate returns warnings to the client performing the update.
func (Strategy) WarningsOnUpdate(ctx context.Context, obj, old runtime.Object) []string {
return nil
}
// StatusStrategy defines the strategy for storing seeds statuses.
type StatusStrategy struct {
Strategy
}
// NewStatusStrategy defines the storage strategy for the status subresource of ManagedSeeds.
func NewStatusStrategy() StatusStrategy {
return StatusStrategy{NewStrategy()}
}
// PrepareForUpdate is invoked on update before validation to normalize
// the object. For example: remove fields that are not to be persisted,
// sort order-insensitive list fields, etc. This should not remove fields
// whose presence would be considered a validation error.
func (s StatusStrategy) PrepareForUpdate(ctx context.Context, obj, old runtime.Object) {
newManagedSeed := obj.(*seedmanagement.ManagedSeed)
oldManagedSeed := old.(*seedmanagement.ManagedSeed)
newManagedSeed.Spec = oldManagedSeed.Spec
}
// ValidateUpdate validates the update on the given old and new object.
func (StatusStrategy) ValidateUpdate(ctx context.Context, obj, old runtime.Object) field.ErrorList {
return validation.ValidateManagedSeedStatusUpdate(obj.(*seedmanagement.ManagedSeed), old.(*seedmanagement.ManagedSeed))
}
// MatchManagedSeed returns a generic matcher for a given label and field selector.
func MatchManagedSeed(label labels.Selector, field fields.Selector) storage.SelectionPredicate {
return storage.SelectionPredicate{
Label: label,
Field: field,
GetAttrs: GetAttrs,
IndexFields: []string{seedmanagement.ManagedSeedShootName},
}
}
// GetAttrs returns labels and fields of a given object for filtering purposes.
func GetAttrs(obj runtime.Object) (labels.Set, fields.Set, error) {
managedSeed, ok := obj.(*seedmanagement.ManagedSeed)
if !ok {
return nil, nil, fmt.Errorf("not a ManagedSeed")
}
return labels.Set(managedSeed.ObjectMeta.Labels), ToSelectableFields(managedSeed), nil
}
// ToSelectableFields returns a field set that represents the object.
func ToSelectableFields(managedSeed *seedmanagement.ManagedSeed) 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.
fieldsSet := make(fields.Set, 3)
fieldsSet[seedmanagement.ManagedSeedShootName] = GetShootName(managedSeed)
return generic.AddObjectMetaFieldsSet(fieldsSet, &managedSeed.ObjectMeta, true)
}
// ShootNameTriggerFunc returns spec.shoot.name of the given ManagedSeed.
func ShootNameTriggerFunc(obj runtime.Object) string {
managedSeed, ok := obj.(*seedmanagement.ManagedSeed)
if !ok {
return ""
}
return GetShootName(managedSeed)
}
// GetShootName returns spec.shoot.name of the given ManagedSeed if it's specified, or an empty string if it's not.
func GetShootName(managedSeed *seedmanagement.ManagedSeed) string {
if managedSeed.Spec.Shoot == nil {
return ""
}
return managedSeed.Spec.Shoot.Name
}