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mutator.go
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mutator.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 m 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 shoot
import (
"context"
"fmt"
"strings"
extensionswebhook "github.com/gardener/gardener/extensions/pkg/webhook"
"github.com/gardener/gardener/pkg/operation/botanist/component/kubeproxy"
"github.com/go-logr/logr"
corev1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/meta"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/log"
)
type mutator struct {
logger logr.Logger
kubeProxyConfigCodec kubeproxy.ConfigCodec
}
// NewMutator creates a new Mutator that mutates resources in the shoot cluster.
func NewMutator() extensionswebhook.Mutator {
return &mutator{
logger: log.Log.WithName("shoot-mutator"),
kubeProxyConfigCodec: kubeproxy.NewConfigCodec(),
}
}
func (m *mutator) Mutate(ctx context.Context, new, _ client.Object) error {
acc, err := meta.Accessor(new)
if err != nil {
return fmt.Errorf("could not create accessor during webhook: %w", err)
}
// If the object does have a deletion timestamp then we don't want to mutate anything.
if acc.GetDeletionTimestamp() != nil {
return nil
}
switch x := new.(type) {
case *corev1.ConfigMap:
switch {
case strings.HasPrefix(x.Name, kubeproxy.ConfigNamePrefix):
extensionswebhook.LogMutation(logger, x.Kind, x.Namespace, x.Name)
return m.mutateKubeProxyConfigMap(ctx, x)
}
}
return nil
}