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headlessService.go
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headlessService.go
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// Copyright © 2019 Cisco Systems, Inc. and/or its affiliates
//
// 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 kafka
import (
"context"
"fmt"
"emperror.dev/errors"
corev1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/selection"
"k8s.io/apimachinery/pkg/util/intstr"
"sigs.k8s.io/controller-runtime/pkg/client"
"github.com/banzaicloud/koperator/api/v1beta1"
apiutil "github.com/banzaicloud/koperator/api/util"
"github.com/banzaicloud/koperator/pkg/resources/templates"
kafkautils "github.com/banzaicloud/koperator/pkg/util/kafka"
)
func (r *Reconciler) headlessService() runtime.Object {
var usedPorts []corev1.ServicePort
// Append internal listener ports
usedPorts = append(usedPorts,
generateServicePortForIListeners(r.KafkaCluster.Spec.ListenersConfig.InternalListeners)...)
//Append external listener ports as well to allow using this service for metadata fetch
usedPorts = append(usedPorts,
generateServicePortForEListeners(r.KafkaCluster.Spec.ListenersConfig.ExternalListeners)...)
// Append additional ports
usedPorts = append(usedPorts,
generateServicePortForAdditionalPorts(r.KafkaCluster.Spec.AdditionalPorts)...)
// prometheus metrics port for servicemonitor
usedPorts = append(usedPorts, corev1.ServicePort{
Name: "metrics",
Port: MetricsPort,
TargetPort: intstr.FromInt(MetricsPort),
Protocol: corev1.ProtocolTCP,
})
return &corev1.Service{
ObjectMeta: templates.ObjectMetaWithAnnotations(
fmt.Sprintf(kafkautils.HeadlessServiceTemplate, r.KafkaCluster.GetName()),
apiutil.MergeLabels(apiutil.LabelsForKafka(r.KafkaCluster.GetName()), r.KafkaCluster.GetLabels()),
r.KafkaCluster.Spec.ListenersConfig.GetServiceAnnotations(),
r.KafkaCluster,
),
Spec: corev1.ServiceSpec{
Type: corev1.ServiceTypeClusterIP,
SessionAffinity: corev1.ServiceAffinityNone,
Selector: apiutil.LabelsForKafka(r.KafkaCluster.Name),
Ports: usedPorts,
ClusterIP: corev1.ClusterIPNone,
PublishNotReadyAddresses: true,
},
}
}
// deleteHeadlessService deletes the headless service that was created for the current KafkaCluster
// if there is any
func (r *Reconciler) deleteHeadlessService() error {
ctx := context.Background()
svc := corev1.Service{
TypeMeta: metav1.TypeMeta{
APIVersion: corev1.SchemeGroupVersion.String(),
Kind: "Service",
},
ObjectMeta: metav1.ObjectMeta{
Namespace: r.KafkaCluster.GetNamespace(),
Name: fmt.Sprintf(kafkautils.HeadlessServiceTemplate, r.KafkaCluster.GetName()),
},
}
err := r.Client.Delete(ctx, &svc)
if err != nil {
err = client.IgnoreNotFound(err)
}
return err
}
// deleteNonHeadlessServices deletes the all-broker service that was created for the current KafkaCluster
// if there is any and also the service of each broker
func (r *Reconciler) deleteNonHeadlessServices(ctx context.Context) error {
svc := corev1.Service{
TypeMeta: metav1.TypeMeta{
APIVersion: corev1.SchemeGroupVersion.String(),
Kind: "Service",
},
ObjectMeta: metav1.ObjectMeta{
Namespace: r.KafkaCluster.GetNamespace(),
Name: fmt.Sprintf(kafkautils.AllBrokerServiceTemplate, r.KafkaCluster.GetName()),
},
}
err := r.Client.Delete(ctx, &svc)
if err != nil && client.IgnoreNotFound(err) != nil {
return err
}
// delete broker services
labelSelector := labels.NewSelector()
for k, v := range apiutil.LabelsForKafka(r.KafkaCluster.GetName()) {
req, err := labels.NewRequirement(k, selection.Equals, []string{v})
if err != nil {
return err
}
labelSelector = labelSelector.Add(*req)
}
// add "has label 'brokerId' to matching labels selector expression
req, err := labels.NewRequirement(v1beta1.BrokerIdLabelKey, selection.Exists, nil)
if err != nil {
return err
}
labelSelector = labelSelector.Add(*req)
var services corev1.ServiceList
err = r.Client.List(ctx, &services,
client.InNamespace(r.KafkaCluster.GetNamespace()),
client.MatchingLabelsSelector{Selector: labelSelector},
)
if err != nil {
return errors.WrapIfWithDetails(err, "failed to list services",
"namespace", r.KafkaCluster.GetNamespace(),
"label selector", labelSelector.String())
}
// if NodePort is used for any of the external listeners, the corresponding services need to remain
// so that clients from outside the Kubernetes cluster can reach the brokers
filteredSvcsToDelete := services
if isNodePortAccessMethodInUseAmongExternalListeners(r.KafkaCluster.Spec.ListenersConfig.ExternalListeners) {
filteredSvcsToDelete = nonNodePortServices(services)
}
for _, svc := range filteredSvcsToDelete.Items {
if !svc.GetDeletionTimestamp().IsZero() {
continue
}
err = r.Client.Delete(ctx, &svc)
if err != nil && client.IgnoreNotFound(err) != nil {
return err
}
}
return nil
}
// isNodePortAccessMethodInUseAmongExternalListeners returns true when users specify any of the external listeners to use NodePort
func isNodePortAccessMethodInUseAmongExternalListeners(externalListeners []v1beta1.ExternalListenerConfig) bool {
for _, externalListener := range externalListeners {
if externalListener.GetAccessMethod() == corev1.ServiceTypeNodePort {
return true
}
}
return false
}
func nonNodePortServices(services corev1.ServiceList) corev1.ServiceList {
var nonNodePortSvc corev1.ServiceList
for _, svc := range services.Items {
if svc.Spec.Type != corev1.ServiceTypeNodePort {
nonNodePortSvc.Items = append(nonNodePortSvc.Items, svc)
}
}
return nonNodePortSvc
}