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storage.go
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storage.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 storage
import (
"context"
"fmt"
autoscalingv1 "k8s.io/api/autoscaling/v1"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apiserver/pkg/registry/generic"
genericregistry "k8s.io/apiserver/pkg/registry/generic/registry"
"k8s.io/apiserver/pkg/registry/rest"
"k8s.io/utils/pointer"
"github.com/gardener/gardener/pkg/apis/seedmanagement"
"github.com/gardener/gardener/pkg/registry/seedmanagement/managedseedset"
)
// REST implements a RESTStorage for ManagedSeedSet.
type REST struct {
*genericregistry.Store
}
// ManagedSeedSetStorage implements the storage for ManagedSeedSets and their status subresource.
type ManagedSeedSetStorage struct {
ManagedSeedSet *REST
Status *StatusREST
Scale *ScaleREST
}
// NewStorage creates a new ManagedSeedSetStorage object.
func NewStorage(optsGetter generic.RESTOptionsGetter) ManagedSeedSetStorage {
managedSeedSetRest, managedSeedSetStatusRest := NewREST(optsGetter)
return ManagedSeedSetStorage{
ManagedSeedSet: managedSeedSetRest,
Status: managedSeedSetStatusRest,
Scale: &ScaleREST{store: managedSeedSetRest.Store},
}
}
// NewREST returns a RESTStorage object that will work with ManagedSeedSet objects.
func NewREST(optsGetter generic.RESTOptionsGetter) (*REST, *StatusREST) {
strategy := managedseedset.NewStrategy()
statusStrategy := managedseedset.NewStatusStrategy()
store := &genericregistry.Store{
NewFunc: func() runtime.Object { return &seedmanagement.ManagedSeedSet{} },
NewListFunc: func() runtime.Object { return &seedmanagement.ManagedSeedSetList{} },
DefaultQualifiedResource: seedmanagement.Resource("managedseedsets"),
EnableGarbageCollection: true,
CreateStrategy: strategy,
UpdateStrategy: strategy,
DeleteStrategy: strategy,
TableConvertor: newTableConvertor(),
}
options := &generic.StoreOptions{
RESTOptions: optsGetter,
AttrFunc: managedseedset.GetAttrs,
}
if err := store.CompleteWithOptions(options); err != nil {
panic(err)
}
statusStore := *store
statusStore.UpdateStrategy = statusStrategy
return &REST{store}, &StatusREST{store: &statusStore}
}
// StatusREST implements the REST endpoint for changing the status of a ManagedSeedSet.
type StatusREST struct {
store *genericregistry.Store
}
var (
_ rest.Storage = &StatusREST{}
_ rest.Getter = &StatusREST{}
_ rest.Updater = &StatusREST{}
)
// New creates a new (empty) internal ManagedSeedSet object.
func (r *StatusREST) New() runtime.Object {
return &seedmanagement.ManagedSeedSet{}
}
// Destroy cleans up its resources on shutdown.
func (r *StatusREST) Destroy() {
// Given that underlying store is shared with REST,
// we don't destroy it here explicitly.
}
// Get retrieves the object from the storage. It is required to support Patch.
func (r *StatusREST) Get(ctx context.Context, name string, options *metav1.GetOptions) (runtime.Object, error) {
return r.store.Get(ctx, name, options)
}
// Update alters the status subset of an object.
func (r *StatusREST) Update(ctx context.Context, name string, objInfo rest.UpdatedObjectInfo, createValidation rest.ValidateObjectFunc, updateValidation rest.ValidateObjectUpdateFunc, forceAllowCreate bool, options *metav1.UpdateOptions) (runtime.Object, bool, error) {
return r.store.Update(ctx, name, objInfo, createValidation, updateValidation, forceAllowCreate, options)
}
// Implement ShortNamesProvider
var _ rest.ShortNamesProvider = &REST{}
// ShortNames implements the ShortNamesProvider interface. Returns a list of short names for a resource.
func (r *REST) ShortNames() []string {
return []string{"mss"}
}
// ScaleREST implements a Scale for ManagedSeedSet.
type ScaleREST struct {
store *genericregistry.Store
}
// ScaleREST implements Patcher
var _ = rest.Patcher(&ScaleREST{})
var _ = rest.GroupVersionKindProvider(&ScaleREST{})
// GroupVersionKind returns GroupVersionKind for ManagedSeedSet Scale object.
func (r *ScaleREST) GroupVersionKind(_ schema.GroupVersion) schema.GroupVersionKind {
return autoscalingv1.SchemeGroupVersion.WithKind("Scale")
}
// New creates a new (empty) Scale object.
func (r *ScaleREST) New() runtime.Object {
return &autoscalingv1.Scale{}
}
// Destroy cleans up its resources on shutdown.
func (r *ScaleREST) Destroy() {
// Given that underlying store is shared with REST,
// we don't destroy it here explicitly.
}
// Get retrieves object from Scale storage.
func (r *ScaleREST) Get(ctx context.Context, name string, options *metav1.GetOptions) (runtime.Object, error) {
obj, err := r.store.Get(ctx, name, options)
if err != nil {
return nil, errors.NewNotFound(seedmanagement.Resource("managedseedsets/scale"), name)
}
mss := obj.(*seedmanagement.ManagedSeedSet)
scale, err := scaleFromManagedSeedSet(mss)
if err != nil {
return nil, errors.NewBadRequest(fmt.Sprintf("%v", err))
}
return scale, nil
}
// Update alters scale subset of ManagedSeedSet object.
func (r *ScaleREST) Update(ctx context.Context, name string, objInfo rest.UpdatedObjectInfo, createValidation rest.ValidateObjectFunc, updateValidation rest.ValidateObjectUpdateFunc, forceAllowCreate bool, options *metav1.UpdateOptions) (runtime.Object, bool, error) {
obj, _, err := r.store.Update(
ctx,
name,
&scaleUpdatedObjectInfo{name, objInfo},
toScaleCreateValidation(createValidation),
toScaleUpdateValidation(updateValidation),
false,
options,
)
if err != nil {
return nil, false, err
}
mss := obj.(*seedmanagement.ManagedSeedSet)
newScale, err := scaleFromManagedSeedSet(mss)
if err != nil {
return nil, false, errors.NewBadRequest(fmt.Sprintf("%v", err))
}
return newScale, false, nil
}
func toScaleCreateValidation(f rest.ValidateObjectFunc) rest.ValidateObjectFunc {
return func(ctx context.Context, obj runtime.Object) error {
scale, err := scaleFromManagedSeedSet(obj.(*seedmanagement.ManagedSeedSet))
if err != nil {
return err
}
return f(ctx, scale)
}
}
func toScaleUpdateValidation(f rest.ValidateObjectUpdateFunc) rest.ValidateObjectUpdateFunc {
return func(ctx context.Context, obj, old runtime.Object) error {
newScale, err := scaleFromManagedSeedSet(obj.(*seedmanagement.ManagedSeedSet))
if err != nil {
return err
}
oldScale, err := scaleFromManagedSeedSet(old.(*seedmanagement.ManagedSeedSet))
if err != nil {
return err
}
return f(ctx, newScale, oldScale)
}
}
// scaleFromManagedSeedSet returns a scale subresource for a ManagedSeedSet.
func scaleFromManagedSeedSet(mss *seedmanagement.ManagedSeedSet) (*autoscalingv1.Scale, error) {
selector, err := metav1.LabelSelectorAsSelector(&mss.Spec.Selector)
if err != nil {
return nil, err
}
return &autoscalingv1.Scale{
ObjectMeta: metav1.ObjectMeta{
Name: mss.Name,
Namespace: mss.Namespace,
UID: mss.UID,
ResourceVersion: mss.ResourceVersion,
CreationTimestamp: mss.CreationTimestamp,
},
Spec: autoscalingv1.ScaleSpec{
Replicas: pointer.Int32Deref(mss.Spec.Replicas, 0),
},
Status: autoscalingv1.ScaleStatus{
Replicas: mss.Status.Replicas,
Selector: selector.String(),
},
}, nil
}
// scaleUpdatedObjectInfo transforms an existing ManagedSeedSet into an existing scale, then to a new scale,
// and finally to a new ManagedSeedSet.
type scaleUpdatedObjectInfo struct {
name string
objInfo rest.UpdatedObjectInfo
}
func (i *scaleUpdatedObjectInfo) Preconditions() *metav1.Preconditions {
return i.objInfo.Preconditions()
}
func (i *scaleUpdatedObjectInfo) UpdatedObject(ctx context.Context, oldObj runtime.Object) (runtime.Object, error) {
mss, ok := oldObj.DeepCopyObject().(*seedmanagement.ManagedSeedSet)
if !ok {
return nil, errors.NewBadRequest(fmt.Sprintf("expected existing object type to be ManagedSeedSet, got %T", mss))
}
if len(mss.ResourceVersion) == 0 {
return nil, errors.NewNotFound(seedmanagement.Resource("managedseedsets/scale"), i.name)
}
// Transform the ManagedSeedSet into the old scale
oldScale, err := scaleFromManagedSeedSet(mss)
if err != nil {
return nil, err
}
// Transform the old scale to a new scale
newScaleObj, err := i.objInfo.UpdatedObject(ctx, oldScale)
if err != nil {
return nil, err
}
if newScaleObj == nil {
return nil, errors.NewBadRequest("nil update passed to Scale")
}
scale, ok := newScaleObj.(*autoscalingv1.Scale)
if !ok {
return nil, errors.NewBadRequest(fmt.Sprintf("expected input object type to be Scale, got %T", newScaleObj))
}
// Validate precondition if specified (resourceVersion matching is handled by storage)
if len(scale.UID) > 0 && scale.UID != mss.UID {
return nil, errors.NewConflict(seedmanagement.Resource("managedseedsets/scale"), mss.Name,
fmt.Errorf("precondition failed: UID in precondition: %v, UID in object meta: %v", scale.UID, mss.UID))
}
// Move replicas/resourceVersion fields to object and return
mss.Spec.Replicas = pointer.Int32(scale.Spec.Replicas)
mss.ResourceVersion = scale.ResourceVersion
return mss, nil
}