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webhook.go
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webhook.go
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// SPDX-FileCopyrightText: 2024 SAP SE or an SAP affiliate company and Gardener contributors
//
// SPDX-License-Identifier: Apache-2.0
package shoot
import (
"context"
"fmt"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"sigs.k8s.io/controller-runtime/pkg/client"
"github.com/gardener/gardener/extensions/pkg/controller"
"github.com/gardener/gardener/extensions/pkg/webhook"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
resourcesv1alpha1 "github.com/gardener/gardener/pkg/apis/resources/v1alpha1"
"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"
"github.com/gardener/gardener/pkg/utils/managedresources"
)
// 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,
shootNamespace string,
managedResourceName string,
shootWebhookConfigs webhook.Configs,
cluster *controller.Cluster,
createIfNotExists bool,
) error {
if cluster.Shoot == nil {
return fmt.Errorf("no shoot found in cluster resource")
}
data, err := managedresources.
NewRegistry(kubernetes.ShootScheme, kubernetes.ShootCodec, kubernetes.ShootSerializer).
AddAllAndSerialize(shootWebhookConfigs.GetWebhookConfigs()...)
if err != nil {
return err
}
f := managedresources.Create
if !createIfNotExists {
f = managedresources.Update
}
if err := f(ctx, c, shootNamespace, managedResourceName, nil, false, "", data, nil, nil, nil); err != nil {
return fmt.Errorf("failed reconciling managed resource '%s/%s' containing shoot webhooks: %w", shootNamespace, 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,
managedResourceName string,
shootNamespaceSelector map[string]string,
shootWebhookConfigs webhook.Configs,
) 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)+1)
for _, namespace := range namespaceList.Items {
namespaceName := namespace.Name
fns = append(fns, func(ctx context.Context) error {
managedResource := &metav1.PartialObjectMetadata{}
managedResource.SetGroupVersionKind(resourcesv1alpha1.SchemeGroupVersion.WithKind("ManagedResource"))
if err := c.Get(ctx, client.ObjectKey{Name: managedResourceName, Namespace: namespaceName}, managedResource); err != nil {
if apierrors.IsNotFound(err) {
return nil
}
return err
}
cluster, err := extensions.GetCluster(ctx, c, namespaceName)
if err != nil {
return err
}
// Ignore not found errors since the managed resource can be deleted in parallel during shoot deletion.
if err := ReconcileWebhookConfig(ctx, c, namespaceName, managedResourceName, *shootWebhookConfigs.DeepCopy(), cluster, false); client.IgnoreNotFound(err) != nil {
return err
}
return nil
})
}
return flow.Parallel(fns...)(ctx)
}