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webhook.go
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webhook.go
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// Copyright (c) 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 shoot
import (
"context"
"fmt"
"github.com/gardener/gardener/extensions/pkg/controller"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/client/kubernetes"
"github.com/gardener/gardener/pkg/extensions"
"github.com/gardener/gardener/pkg/utils"
"github.com/gardener/gardener/pkg/utils/flow"
kutil "github.com/gardener/gardener/pkg/utils/kubernetes"
"github.com/gardener/gardener/pkg/utils/managedresources"
admissionregistrationv1 "k8s.io/api/admissionregistration/v1"
corev1 "k8s.io/api/core/v1"
networkingv1 "k8s.io/api/networking/v1"
"k8s.io/apimachinery/pkg/api/errors"
"sigs.k8s.io/controller-runtime/pkg/client"
)
// ReconcileWebhookConfig deploys the shoot webhook configuration, i.e., a network policy to allow the
// kube-apiserver to talk to the extension, and a managed resource that contains the MutatingWebhookConfiguration.
func ReconcileWebhookConfig(
ctx context.Context,
c client.Client,
namespace string,
extensionName string,
managedResourceName string,
serverPort int,
shootWebhookConfig *admissionregistrationv1.MutatingWebhookConfiguration,
cluster *controller.Cluster,
) error {
if err := EnsureNetworkPolicy(ctx, c, namespace, extensionName, serverPort); err != nil {
return fmt.Errorf("could not create or update network policy for shoot webhooks in namespace '%s': %w", namespace, err)
}
if cluster.Shoot == nil {
return fmt.Errorf("no shoot found in cluster resource")
}
data, err := managedresources.
NewRegistry(kubernetes.ShootScheme, kubernetes.ShootCodec, kubernetes.ShootSerializer).
AddAllAndSerialize(shootWebhookConfig)
if err != nil {
return err
}
if err := managedresources.Create(ctx, c, namespace, managedResourceName, nil, false, "", data, nil, nil, nil); err != nil {
return fmt.Errorf("could not create or update managed resource '%s/%s' containing shoot webhooks: %w", namespace, managedResourceName, err)
}
return nil
}
// ReconcileWebhooksForAllNamespaces reconciles the shoot webhooks in all shoot namespaces of the given
// provider type. This is necessary in case the webhook port is changed (otherwise, the network policy would only be
// updated again as part of the ControlPlane reconciliation which might only happen in the next 24h).
func ReconcileWebhooksForAllNamespaces(
ctx context.Context,
c client.Client,
extensionName string,
managedResourceName string,
shootNamespaceSelector map[string]string,
port int,
shootWebhookConfig *admissionregistrationv1.MutatingWebhookConfiguration,
) error {
namespaceList := &corev1.NamespaceList{}
if err := c.List(ctx, namespaceList, client.MatchingLabels(utils.MergeStringMaps(map[string]string{
v1beta1constants.GardenRole: v1beta1constants.GardenRoleShoot,
}, shootNamespaceSelector))); err != nil {
return err
}
fns := make([]flow.TaskFn, 0, len(namespaceList.Items))
for _, namespace := range namespaceList.Items {
var (
networkPolicy = GetNetworkPolicyMeta(namespace.Name, extensionName)
namespaceName = namespace.Name
networkPolicyName = networkPolicy.Name
)
fns = append(fns, func(ctx context.Context) error {
if err := c.Get(ctx, kutil.Key(namespaceName, networkPolicyName), &networkingv1.NetworkPolicy{}); err != nil {
if !errors.IsNotFound(err) {
return err
}
return nil
}
cluster, err := extensions.GetCluster(ctx, c, namespaceName)
if err != nil {
return err
}
return ReconcileWebhookConfig(ctx, c, namespaceName, extensionName, managedResourceName, port, shootWebhookConfig.DeepCopy(), cluster)
})
}
return flow.Parallel(fns...)(ctx)
}