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reconciler.go
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reconciler.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 ingress
import (
"context"
"fmt"
extensionsv1alpha1 "github.com/gardener/gardener/pkg/apis/extensions/v1alpha1"
"github.com/gardener/gardener/pkg/provider-local/local"
"github.com/gardener/gardener/pkg/utils"
gutil "github.com/gardener/gardener/pkg/utils/gardener"
corev1 "k8s.io/api/core/v1"
networkingv1 "k8s.io/api/networking/v1"
apierrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime"
"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"
)
type reconciler struct {
client client.Client
}
func (r *reconciler) InjectClient(client client.Client) error {
r.client = client
return nil
}
func (r *reconciler) Reconcile(ctx context.Context, req reconcile.Request) (reconcile.Result, error) {
log := logf.FromContext(ctx)
key := req.NamespacedName
ingress := &networkingv1.Ingress{}
if err := r.client.Get(ctx, key, ingress); 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)
}
ip := ipForIngress(ingress)
if ip == "" {
log.Info("Skipping ingress because it doesn't have a LoadBalancer IP")
return reconcile.Result{}, nil
}
log.Info("Reconciling ingress")
dnsRecords, err := dnsRecordsForIngress(ingress, ip, r.client.Scheme())
if err != nil {
return reconcile.Result{}, err
}
for _, record := range dnsRecords {
log.Info("Applying DNSRecord", "dnsRecord", client.ObjectKeyFromObject(record), "host", record.Spec.Name)
if err = r.client.Patch(ctx, record, client.Apply, local.FieldOwner, client.ForceOwnership); err != nil {
return reconcile.Result{}, err
}
}
return reconcile.Result{}, nil
}
func ipForIngress(ingress *networkingv1.Ingress) string {
for _, ing := range ingress.Status.LoadBalancer.Ingress {
if ing.IP != "" {
return ing.IP
}
}
return ""
}
func dnsRecordsForIngress(ingress *networkingv1.Ingress, ip string, scheme *runtime.Scheme) ([]*extensionsv1alpha1.DNSRecord, error) {
var dnsRecords []*extensionsv1alpha1.DNSRecord
for _, rule := range ingress.Spec.Rules {
host := rule.Host
record := &extensionsv1alpha1.DNSRecord{
TypeMeta: metav1.TypeMeta{
APIVersion: extensionsv1alpha1.SchemeGroupVersion.String(),
Kind: extensionsv1alpha1.DNSRecordResource,
},
ObjectMeta: metav1.ObjectMeta{
Name: ingress.Name + "-" + utils.ComputeSHA256Hex([]byte(host))[:8],
Namespace: ingress.Namespace,
Labels: map[string]string{
"origin": "provider-local",
"for": "ingress",
},
Annotations: map[string]string{
// skip deletion protection, otherwise garbage collector won't be able to delete this DNSRecord object
gutil.ConfirmationDeletion: "true",
},
},
Spec: extensionsv1alpha1.DNSRecordSpec{
DefaultSpec: extensionsv1alpha1.DefaultSpec{
Type: local.Type,
},
RecordType: extensionsv1alpha1.DNSRecordTypeA,
Name: host,
Values: []string{ip},
SecretRef: corev1.SecretReference{
Name: "provider-local-is-awesome",
},
},
}
if err := controllerutil.SetControllerReference(ingress, record, scheme); err != nil {
return nil, err
}
dnsRecords = append(dnsRecords, record)
}
return dnsRecords, nil
}