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reconciler.go
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reconciler.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 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 rootcapublisher
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/utils/pointer"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
logf "sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/reconcile"
)
const (
// RootCACertConfigMapName is a constant for the name of the ConfigMap which contains the root CA certificate.
RootCACertConfigMapName = "kube-root-ca.crt"
// RootCADataKey is a constant for the data key in a ConfigMap containing the root CA certificate.
RootCADataKey = "ca.crt"
// DescriptionAnnotation is constant for annotation key of the config map.
DescriptionAnnotation = "kubernetes.io/description"
)
type reconciler struct {
targetClient client.Client
rootCA string
}
// NewReconciler is constructor only used in tests.
func NewReconciler(cl client.Client, rootCA string) *reconciler {
return &reconciler{
targetClient: cl,
rootCA: rootCA,
}
}
func (r *reconciler) Reconcile(ctx context.Context, req reconcile.Request) (reconcile.Result, error) {
log := logf.FromContext(ctx)
namespace := &corev1.Namespace{}
if err := r.targetClient.Get(ctx, req.NamespacedName, namespace); err != nil {
if apierrors.IsNotFound(err) {
log.Info("Namespace has been deleted, stopping reconciliation")
return reconcile.Result{}, nil
}
return reconcile.Result{}, fmt.Errorf("could not fetch Namespace: %w", err)
}
ownerReference := metav1.NewControllerRef(namespace, corev1.SchemeGroupVersion.WithKind("Namespace"))
ownerReference.BlockOwnerDeletion = pointer.Bool(false)
configmap := &corev1.ConfigMap{
ObjectMeta: metav1.ObjectMeta{
Name: RootCACertConfigMapName,
Namespace: namespace.Name,
},
}
if _, err := controllerutil.CreateOrUpdate(ctx, r.targetClient, configmap, func() error {
if _, found := configmap.Annotations[DescriptionAnnotation]; !found {
configmap.Data = map[string]string{RootCADataKey: r.rootCA}
configmap.OwnerReferences = []metav1.OwnerReference{*ownerReference}
}
return nil
}); client.IgnoreNotFound(err) != nil && !apierrors.HasStatusCause(err, corev1.NamespaceTerminatingCause) {
// don't retry a create if the namespace doesn't exist or is terminating
return reconcile.Result{}, err
}
return reconcile.Result{}, nil
}