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admission.go
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admission.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 managedseed
import (
"context"
"errors"
"fmt"
"io"
"github.com/gardener/gardener/pkg/apis/core"
admissioninitializer "github.com/gardener/gardener/pkg/apiserver/admission/initializer"
coreclientset "github.com/gardener/gardener/pkg/client/core/clientset/internalversion"
seedmanagementclientset "github.com/gardener/gardener/pkg/client/seedmanagement/clientset/versioned"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apiserver/pkg/admission"
)
const (
// PluginName is the name of this admission plugin.
PluginName = "ShootManagedSeed"
)
// Register registers a plugin.
func Register(plugins *admission.Plugins) {
plugins.Register(PluginName, func(config io.Reader) (admission.Interface, error) {
return New()
})
}
// ManagedSeed contains listers and and admission handler.
type ManagedSeed struct {
*admission.Handler
coreClient coreclientset.Interface
seedManagementClient seedmanagementclientset.Interface
readyFunc admission.ReadyFunc
}
var (
_ = admissioninitializer.WantsInternalCoreClientset(&ManagedSeed{})
_ = admissioninitializer.WantsSeedManagementClientset(&ManagedSeed{})
readyFuncs = []admission.ReadyFunc{}
)
// New creates a new ManagedSeed admission plugin.
func New() (*ManagedSeed, error) {
return &ManagedSeed{
Handler: admission.NewHandler(admission.Delete),
}, nil
}
// AssignReadyFunc assigns the ready function to the admission handler.
func (v *ManagedSeed) AssignReadyFunc(f admission.ReadyFunc) {
v.readyFunc = f
v.SetReadyFunc(f)
}
// SetInternalCoreClientset sets the garden core clientset.
func (v *ManagedSeed) SetInternalCoreClientset(c coreclientset.Interface) {
v.coreClient = c
}
// SetSeedManagementClientset sets the garden seedmanagement clientset.
func (v *ManagedSeed) SetSeedManagementClientset(c seedmanagementclientset.Interface) {
v.seedManagementClient = c
}
// ValidateInitialization checks whether the plugin was correctly initialized.
func (v *ManagedSeed) ValidateInitialization() error {
if v.coreClient == nil {
return errors.New("missing garden core client")
}
if v.seedManagementClient == nil {
return errors.New("missing garden seedmanagement client")
}
return nil
}
var _ admission.ValidationInterface = &ManagedSeed{}
// Validate validates if the Shoot can be deleted. If the
func (v *ManagedSeed) Validate(ctx context.Context, a admission.Attributes, _ admission.ObjectInterfaces) error {
// Wait until the caches have been synced
if v.readyFunc == nil {
v.AssignReadyFunc(func() bool {
for _, readyFunc := range readyFuncs {
if !readyFunc() {
return false
}
}
return true
})
}
if !v.WaitForReady() {
return admission.NewForbidden(a, errors.New("not yet ready to handle request"))
}
// Ignore all kinds other than Shoot
if a.GetKind().GroupKind() != core.Kind("Shoot") {
return nil
}
// Ignore updates to status or other subresources
if a.GetSubresource() != "" {
return nil
}
switch {
case a.GetName() == "":
return v.validateDeleteCollection(ctx, a)
default:
return v.validateDelete(ctx, a)
}
}
func (v *ManagedSeed) validateDeleteCollection(ctx context.Context, a admission.Attributes) error {
shoots, err := v.getShoots(ctx, labels.Everything())
if err != nil {
return err
}
for _, shoot := range shoots {
if err := v.validateDelete(ctx, newAttributesWithName(a, shoot.Name)); err != nil {
return err
}
}
return nil
}
func (v *ManagedSeed) validateDelete(ctx context.Context, a admission.Attributes) error {
managedSeed, err := kutil.GetManagedSeed(ctx, v.seedManagementClient, a.GetNamespace(), a.GetName())
if err != nil {
return apierrors.NewInternalError(fmt.Errorf("could not get ManagedSeed for shoot '%s/%s': %v", a.GetNamespace(), a.GetName(), err))
}
if managedSeed == nil {
return nil
}
return admission.NewForbidden(a, fmt.Errorf("cannot delete shoot %s/%s since it is still referenced by a managed seed", a.GetNamespace(), a.GetName()))
}
func newAttributesWithName(a admission.Attributes, name string) admission.Attributes {
return admission.NewAttributesRecord(a.GetObject(),
a.GetOldObject(),
a.GetKind(),
a.GetNamespace(),
name,
a.GetResource(),
a.GetSubresource(),
a.GetOperation(),
a.GetOperationOptions(),
a.IsDryRun(),
a.GetUserInfo())
}
func (v *ManagedSeed) getShoots(ctx context.Context, selector labels.Selector) ([]core.Shoot, error) {
shootList, err := v.coreClient.Core().Shoots("").List(ctx, metav1.ListOptions{LabelSelector: selector.String()})
if err != nil {
return nil, err
}
return shootList.Items, nil
}