/
admission.go
74 lines (62 loc) · 2.35 KB
/
admission.go
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// Copyright 2022 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 nodelocaldns
import (
"context"
"errors"
"io"
apierrors "k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apiserver/pkg/admission"
"github.com/gardener/gardener/pkg/apis/core"
gardencorehelper "github.com/gardener/gardener/pkg/apis/core/helper"
plugin "github.com/gardener/gardener/plugin/pkg"
)
// Register registers a plugin.
func Register(plugins *admission.Plugins) {
plugins.Register(plugin.PluginNameShootNodeLocalDNSEnabledByDefault, func(_ io.Reader) (admission.Interface, error) {
return New(), nil
})
}
// ShootNodeLocalDNS contains required information to process admission requests.
type ShootNodeLocalDNS struct {
*admission.Handler
}
// New creates a new ShootNodeLocalDNS admission plugin.
func New() admission.MutationInterface {
return &ShootNodeLocalDNS{
Handler: admission.NewHandler(admission.Create),
}
}
// Admit defaults spec.systemComponents.nodeLocalDNS.enabled=true for new shoot clusters.
func (c *ShootNodeLocalDNS) Admit(_ context.Context, a admission.Attributes, _ admission.ObjectInterfaces) error {
switch {
case a.GetKind().GroupKind() != core.Kind("Shoot"),
a.GetOperation() != admission.Create,
a.GetSubresource() != "":
return nil
}
shoot, ok := a.GetObject().(*core.Shoot)
if !ok {
return apierrors.NewInternalError(errors.New("could not convert resource into Shoot object"))
}
if !gardencorehelper.IsWorkerless(shoot) {
if shoot.Spec.SystemComponents == nil {
shoot.Spec.SystemComponents = &core.SystemComponents{}
}
if shoot.Spec.SystemComponents.NodeLocalDNS == nil {
shoot.Spec.SystemComponents.NodeLocalDNS = &core.NodeLocalDNS{Enabled: true}
}
}
return nil
}