/
reconciler.go
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/
reconciler.go
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// Copyright 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 secrets
import (
"context"
"fmt"
corev1 "k8s.io/api/core/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/sets"
"sigs.k8s.io/controller-runtime/pkg/client"
logf "sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
gardencorev1beta1 "github.com/gardener/gardener/pkg/apis/core/v1beta1"
v1beta1constants "github.com/gardener/gardener/pkg/apis/core/v1beta1/constants"
"github.com/gardener/gardener/pkg/controllerutils"
"github.com/gardener/gardener/pkg/utils/flow"
gardenerutils "github.com/gardener/gardener/pkg/utils/gardener"
)
// Reconciler reconciles Seeds and creates a dedicated namespace for each seed in the garden cluster. It also syncs
// relevant garden secrets into this namespace.
type Reconciler struct {
Client client.Client
GardenNamespace string
}
// Reconcile reconciles Seeds and creates a dedicated namespace for each seed in the garden cluster. It also syncs
// relevant garden secrets into this namespace.
func (r *Reconciler) Reconcile(ctx context.Context, req reconcile.Request) (reconcile.Result, error) {
log := logf.FromContext(ctx)
ctx, cancel := controllerutils.GetMainReconciliationContext(ctx, controllerutils.DefaultReconciliationTimeout)
defer cancel()
seed := &gardencorev1beta1.Seed{}
if err := r.Client.Get(ctx, req.NamespacedName, seed); err != nil {
if apierrors.IsNotFound(err) {
log.V(1).Info("Object is gone, stop reconciling")
return reconcile.Result{}, nil
}
return reconcile.Result{}, fmt.Errorf("error retrieving object from store: %w", err)
}
namespace := &corev1.Namespace{
ObjectMeta: metav1.ObjectMeta{
Name: gardenerutils.ComputeGardenNamespace(seed.Name),
Labels: map[string]string{v1beta1constants.GardenRole: v1beta1constants.GardenRoleSeed},
},
}
log = log.WithValues("gardenNamespace", namespace.Name)
if err := r.Client.Get(ctx, client.ObjectKeyFromObject(namespace), namespace); err != nil {
if !apierrors.IsNotFound(err) {
return reconcile.Result{}, err
}
// create namespace with controller ref to seed
namespace.SetOwnerReferences([]metav1.OwnerReference{*metav1.NewControllerRef(seed, gardencorev1beta1.SchemeGroupVersion.WithKind("Seed"))})
log.Info("Creating Namespace in garden for Seed")
if err := r.Client.Create(ctx, namespace); err != nil {
return reconcile.Result{}, err
}
} else {
// namespace already exists, check if it has controller ref to seed
if !metav1.IsControlledBy(namespace, seed) {
return reconcile.Result{}, fmt.Errorf("namespace %q is not controlled by seed %q", namespace.Name, seed.Name)
}
if namespace.Labels[v1beta1constants.GardenRole] != v1beta1constants.GardenRoleSeed {
patch := client.MergeFrom(namespace.DeepCopy())
metav1.SetMetaDataLabel(&namespace.ObjectMeta, v1beta1constants.GardenRole, v1beta1constants.GardenRoleSeed)
if err := r.Client.Patch(ctx, namespace, patch); err != nil {
return reconcile.Result{}, err
}
}
}
syncedSecrets, err := r.syncGardenSecrets(ctx, namespace)
if err != nil {
return reconcile.Result{}, fmt.Errorf("failed to sync garden secrets: %v", err)
}
if err := r.cleanupStaleSecrets(ctx, syncedSecrets, namespace.Name); err != nil {
return reconcile.Result{}, fmt.Errorf("failed to clean up secrets in seed namespace: %v", err)
}
return reconcile.Result{}, nil
}
func (r *Reconciler) cleanupStaleSecrets(ctx context.Context, existingSecrets []string, namespace string) error {
var fns []flow.TaskFn
exclude := sets.New(existingSecrets...)
secretList := &corev1.SecretList{}
if err := r.Client.List(ctx, secretList, client.InNamespace(namespace), client.MatchingLabelsSelector{Selector: gardenRoleSelector}); err != nil {
return err
}
for _, s := range secretList.Items {
secret := s
if exclude.Has(secret.Name) {
continue
}
fns = append(fns, func(ctx context.Context) error {
return client.IgnoreNotFound(r.Client.Delete(ctx, &secret))
})
}
return flow.Parallel(fns...)(ctx)
}
func (r *Reconciler) syncGardenSecrets(ctx context.Context, namespace *corev1.Namespace) ([]string, error) {
secretList := &corev1.SecretList{}
if err := r.Client.List(ctx, secretList, client.InNamespace(r.GardenNamespace), client.MatchingLabelsSelector{Selector: gardenRoleSelector}); err != nil {
return nil, err
}
var (
fns []flow.TaskFn
secretNames []string
)
for _, s := range secretList.Items {
secret := s
secretNames = append(secretNames, secret.Name)
fns = append(fns, func(ctx context.Context) error {
seedSecret := &corev1.Secret{
ObjectMeta: metav1.ObjectMeta{
Name: secret.Name,
Namespace: namespace.Name,
},
}
_, err := controllerutils.GetAndCreateOrMergePatch(ctx, r.Client, seedSecret, func() error {
seedSecret.Annotations = secret.Annotations
seedSecret.Labels = secret.Labels
seedSecret.Type = secret.Type
seedSecret.Data = secret.Data
return nil
})
return err
})
}
return secretNames, flow.Parallel(fns...)(ctx)
}