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service.go
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service.go
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/*
Copyright 2017 The Kubernetes Authors.
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 source
import (
"context"
"fmt"
"net"
"sort"
"strings"
"text/template"
log "github.com/sirupsen/logrus"
v1 "k8s.io/api/core/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
kubeinformers "k8s.io/client-go/informers"
coreinformers "k8s.io/client-go/informers/core/v1"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/cache"
"sigs.k8s.io/external-dns/endpoint"
)
// serviceSource is an implementation of Source for Kubernetes service objects.
// It will find all services that are under our jurisdiction, i.e. annotated
// desired hostname and matching or no controller annotation. For each of the
// matched services' entrypoints it will return a corresponding
// Endpoint object.
type serviceSource struct {
client kubernetes.Interface
namespace string
annotationFilter string
// process Services with legacy annotations
compatibility string
fqdnTemplate *template.Template
combineFQDNAnnotation bool
ignoreHostnameAnnotation bool
publishInternal bool
publishHostIP bool
alwaysPublishNotReadyAddresses bool
resolveLoadBalancerHostname bool
serviceInformer coreinformers.ServiceInformer
endpointsInformer coreinformers.EndpointsInformer
podInformer coreinformers.PodInformer
nodeInformer coreinformers.NodeInformer
serviceTypeFilter map[string]struct{}
labelSelector labels.Selector
}
// NewServiceSource creates a new serviceSource with the given config.
func NewServiceSource(ctx context.Context, kubeClient kubernetes.Interface, namespace, annotationFilter string, fqdnTemplate string, combineFqdnAnnotation bool, compatibility string, publishInternal bool, publishHostIP bool, alwaysPublishNotReadyAddresses bool, serviceTypeFilter []string, ignoreHostnameAnnotation bool, labelSelector labels.Selector, resolveLoadBalancerHostname bool) (Source, error) {
tmpl, err := parseTemplate(fqdnTemplate)
if err != nil {
return nil, err
}
// Use shared informers to listen for add/update/delete of services/pods/nodes in the specified namespace.
// Set resync period to 0, to prevent processing when nothing has changed
informerFactory := kubeinformers.NewSharedInformerFactoryWithOptions(kubeClient, 0, kubeinformers.WithNamespace(namespace))
serviceInformer := informerFactory.Core().V1().Services()
endpointsInformer := informerFactory.Core().V1().Endpoints()
podInformer := informerFactory.Core().V1().Pods()
nodeInformer := informerFactory.Core().V1().Nodes()
// Add default resource event handlers to properly initialize informer.
serviceInformer.Informer().AddEventHandler(
cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
},
},
)
endpointsInformer.Informer().AddEventHandler(
cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
},
},
)
podInformer.Informer().AddEventHandler(
cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
},
},
)
nodeInformer.Informer().AddEventHandler(
cache.ResourceEventHandlerFuncs{
AddFunc: func(obj interface{}) {
},
},
)
informerFactory.Start(ctx.Done())
// wait for the local cache to be populated.
if err := waitForCacheSync(context.Background(), informerFactory); err != nil {
return nil, err
}
// Transform the slice into a map so it will
// be way much easier and fast to filter later
serviceTypes := make(map[string]struct{})
for _, serviceType := range serviceTypeFilter {
serviceTypes[serviceType] = struct{}{}
}
return &serviceSource{
client: kubeClient,
namespace: namespace,
annotationFilter: annotationFilter,
compatibility: compatibility,
fqdnTemplate: tmpl,
combineFQDNAnnotation: combineFqdnAnnotation,
ignoreHostnameAnnotation: ignoreHostnameAnnotation,
publishInternal: publishInternal,
publishHostIP: publishHostIP,
alwaysPublishNotReadyAddresses: alwaysPublishNotReadyAddresses,
serviceInformer: serviceInformer,
endpointsInformer: endpointsInformer,
podInformer: podInformer,
nodeInformer: nodeInformer,
serviceTypeFilter: serviceTypes,
labelSelector: labelSelector,
resolveLoadBalancerHostname: resolveLoadBalancerHostname,
}, nil
}
// Endpoints returns endpoint objects for each service that should be processed.
func (sc *serviceSource) Endpoints(ctx context.Context) ([]*endpoint.Endpoint, error) {
services, err := sc.serviceInformer.Lister().Services(sc.namespace).List(sc.labelSelector)
if err != nil {
return nil, err
}
services, err = sc.filterByAnnotations(services)
if err != nil {
return nil, err
}
// filter on service types if at least one has been provided
if len(sc.serviceTypeFilter) > 0 {
services = sc.filterByServiceType(services)
}
endpoints := []*endpoint.Endpoint{}
for _, svc := range services {
// Check controller annotation to see if we are responsible.
controller, ok := svc.Annotations[controllerAnnotationKey]
if ok && controller != controllerAnnotationValue {
log.Debugf("Skipping service %s/%s because controller value does not match, found: %s, required: %s",
svc.Namespace, svc.Name, controller, controllerAnnotationValue)
continue
}
svcEndpoints := sc.endpoints(svc)
// process legacy annotations if no endpoints were returned and compatibility mode is enabled.
if len(svcEndpoints) == 0 && sc.compatibility != "" {
svcEndpoints, err = legacyEndpointsFromService(svc, sc)
if err != nil {
return nil, err
}
}
// apply template if none of the above is found
if (sc.combineFQDNAnnotation || len(svcEndpoints) == 0) && sc.fqdnTemplate != nil {
sEndpoints, err := sc.endpointsFromTemplate(svc)
if err != nil {
return nil, err
}
if sc.combineFQDNAnnotation {
svcEndpoints = append(svcEndpoints, sEndpoints...)
} else {
svcEndpoints = sEndpoints
}
}
if len(svcEndpoints) == 0 {
log.Debugf("No endpoints could be generated from service %s/%s", svc.Namespace, svc.Name)
continue
}
log.Debugf("Endpoints generated from service: %s/%s: %v", svc.Namespace, svc.Name, svcEndpoints)
sc.setResourceLabel(svc, svcEndpoints)
endpoints = append(endpoints, svcEndpoints...)
}
// this sorting is required to make merging work.
// after we merge endpoints that have same DNS, we want to ensure that we end up with the same service being an "owner"
// of all those records, as otherwise each time we update, we will end up with a different service that gets data merged in
// and that will cause external-dns to recreate dns record due to different service owner in TXT record.
// if new service is added or old one removed, that might cause existing record to get re-created due to potentially new
// owner being selected. Which is fine, since it shouldn't happen often and shouldn't cause any disruption.
if len(endpoints) > 1 {
sort.Slice(endpoints, func(i, j int) bool {
return endpoints[i].Labels[endpoint.ResourceLabelKey] < endpoints[j].Labels[endpoint.ResourceLabelKey]
})
// Use stable sort to not disrupt the order of services
sort.SliceStable(endpoints, func(i, j int) bool {
if endpoints[i].DNSName != endpoints[j].DNSName {
return endpoints[i].DNSName < endpoints[j].DNSName
}
return endpoints[i].RecordType < endpoints[j].RecordType
})
mergedEndpoints := []*endpoint.Endpoint{}
mergedEndpoints = append(mergedEndpoints, endpoints[0])
for i := 1; i < len(endpoints); i++ {
lastMergedEndpoint := len(mergedEndpoints) - 1
if mergedEndpoints[lastMergedEndpoint].DNSName == endpoints[i].DNSName &&
mergedEndpoints[lastMergedEndpoint].RecordType == endpoints[i].RecordType &&
mergedEndpoints[lastMergedEndpoint].SetIdentifier == endpoints[i].SetIdentifier &&
mergedEndpoints[lastMergedEndpoint].RecordTTL == endpoints[i].RecordTTL {
mergedEndpoints[lastMergedEndpoint].Targets = append(mergedEndpoints[lastMergedEndpoint].Targets, endpoints[i].Targets[0])
} else {
mergedEndpoints = append(mergedEndpoints, endpoints[i])
}
}
endpoints = mergedEndpoints
}
for _, ep := range endpoints {
sort.Sort(ep.Targets)
}
return endpoints, nil
}
// extractHeadlessEndpoints extracts endpoints from a headless service using the "Endpoints" Kubernetes API resource
func (sc *serviceSource) extractHeadlessEndpoints(svc *v1.Service, hostname string, ttl endpoint.TTL) []*endpoint.Endpoint {
var endpoints []*endpoint.Endpoint
labelSelector, err := metav1.ParseToLabelSelector(labels.Set(svc.Spec.Selector).AsSelectorPreValidated().String())
if err != nil {
return nil
}
selector, err := metav1.LabelSelectorAsSelector(labelSelector)
if err != nil {
return nil
}
endpointsObject, err := sc.endpointsInformer.Lister().Endpoints(svc.Namespace).Get(svc.GetName())
if err != nil {
log.Errorf("Get endpoints of service[%s] error:%v", svc.GetName(), err)
return endpoints
}
pods, err := sc.podInformer.Lister().Pods(svc.Namespace).List(selector)
if err != nil {
log.Errorf("List pods of service[%s] error: %v", svc.GetName(), err)
return endpoints
}
endpointsType := getEndpointsTypeFromAnnotations(svc.Annotations)
targetsByHeadlessDomainAndType := make(map[endpoint.EndpointKey]endpoint.Targets)
for _, subset := range endpointsObject.Subsets {
addresses := subset.Addresses
if svc.Spec.PublishNotReadyAddresses || sc.alwaysPublishNotReadyAddresses {
addresses = append(addresses, subset.NotReadyAddresses...)
}
for _, address := range addresses {
// find pod for this address
if address.TargetRef == nil || address.TargetRef.APIVersion != "" || address.TargetRef.Kind != "Pod" {
log.Debugf("Skipping address because its target is not a pod: %v", address)
continue
}
var pod *v1.Pod
for _, v := range pods {
if v.Name == address.TargetRef.Name {
pod = v
break
}
}
if pod == nil {
log.Errorf("Pod %s not found for address %v", address.TargetRef.Name, address)
continue
}
headlessDomains := []string{hostname}
if pod.Spec.Hostname != "" {
headlessDomains = append(headlessDomains, fmt.Sprintf("%s.%s", pod.Spec.Hostname, hostname))
}
for _, headlessDomain := range headlessDomains {
targets := getTargetsFromTargetAnnotation(pod.Annotations)
if len(targets) == 0 {
if endpointsType == EndpointsTypeNodeExternalIP {
node, err := sc.nodeInformer.Lister().Get(pod.Spec.NodeName)
if err != nil {
log.Errorf("Get node[%s] of pod[%s] error: %v; not adding any NodeExternalIP endpoints", pod.Spec.NodeName, pod.GetName(), err)
return endpoints
}
for _, address := range node.Status.Addresses {
if address.Type == v1.NodeExternalIP || (address.Type == v1.NodeInternalIP && suitableType(address.Address) == endpoint.RecordTypeAAAA) {
targets = append(targets, address.Address)
log.Debugf("Generating matching endpoint %s with NodeExternalIP %s", headlessDomain, address.Address)
}
}
} else if endpointsType == EndpointsTypeHostIP || sc.publishHostIP {
targets = endpoint.Targets{pod.Status.HostIP}
log.Debugf("Generating matching endpoint %s with HostIP %s", headlessDomain, pod.Status.HostIP)
} else {
targets = endpoint.Targets{address.IP}
log.Debugf("Generating matching endpoint %s with EndpointAddress IP %s", headlessDomain, address.IP)
}
}
for _, target := range targets {
key := endpoint.EndpointKey{
DNSName: headlessDomain,
RecordType: suitableType(target),
}
targetsByHeadlessDomainAndType[key] = append(targetsByHeadlessDomainAndType[key], target)
}
}
}
}
headlessKeys := []endpoint.EndpointKey{}
for headlessKey := range targetsByHeadlessDomainAndType {
headlessKeys = append(headlessKeys, headlessKey)
}
sort.Slice(headlessKeys, func(i, j int) bool {
if headlessKeys[i].DNSName != headlessKeys[j].DNSName {
return headlessKeys[i].DNSName < headlessKeys[j].DNSName
}
return headlessKeys[i].RecordType < headlessKeys[j].RecordType
})
for _, headlessKey := range headlessKeys {
allTargets := targetsByHeadlessDomainAndType[headlessKey]
targets := []string{}
deduppedTargets := map[string]struct{}{}
for _, target := range allTargets {
if _, ok := deduppedTargets[target]; ok {
log.Debugf("Removing duplicate target %s", target)
continue
}
deduppedTargets[target] = struct{}{}
targets = append(targets, target)
}
var ep *endpoint.Endpoint
if ttl.IsConfigured() {
ep = endpoint.NewEndpointWithTTL(headlessKey.DNSName, headlessKey.RecordType, ttl, targets...)
} else {
ep = endpoint.NewEndpoint(headlessKey.DNSName, headlessKey.RecordType, targets...)
}
if ep != nil {
endpoints = append(endpoints, ep)
}
}
return endpoints
}
func (sc *serviceSource) endpointsFromTemplate(svc *v1.Service) ([]*endpoint.Endpoint, error) {
hostnames, err := execTemplate(sc.fqdnTemplate, svc)
if err != nil {
return nil, err
}
providerSpecific, setIdentifier := getProviderSpecificAnnotations(svc.Annotations)
var endpoints []*endpoint.Endpoint
for _, hostname := range hostnames {
endpoints = append(endpoints, sc.generateEndpoints(svc, hostname, providerSpecific, setIdentifier, false)...)
}
return endpoints, nil
}
// endpointsFromService extracts the endpoints from a service object
func (sc *serviceSource) endpoints(svc *v1.Service) []*endpoint.Endpoint {
var endpoints []*endpoint.Endpoint
// Skip endpoints if we do not want entries from annotations
if !sc.ignoreHostnameAnnotation {
providerSpecific, setIdentifier := getProviderSpecificAnnotations(svc.Annotations)
var hostnameList []string
var internalHostnameList []string
hostnameList = getHostnamesFromAnnotations(svc.Annotations)
for _, hostname := range hostnameList {
endpoints = append(endpoints, sc.generateEndpoints(svc, hostname, providerSpecific, setIdentifier, false)...)
}
internalHostnameList = getInternalHostnamesFromAnnotations(svc.Annotations)
for _, hostname := range internalHostnameList {
endpoints = append(endpoints, sc.generateEndpoints(svc, hostname, providerSpecific, setIdentifier, true)...)
}
}
return endpoints
}
// filterByAnnotations filters a list of services by a given annotation selector.
func (sc *serviceSource) filterByAnnotations(services []*v1.Service) ([]*v1.Service, error) {
labelSelector, err := metav1.ParseToLabelSelector(sc.annotationFilter)
if err != nil {
return nil, err
}
selector, err := metav1.LabelSelectorAsSelector(labelSelector)
if err != nil {
return nil, err
}
// empty filter returns original list
if selector.Empty() {
return services, nil
}
filteredList := []*v1.Service{}
for _, service := range services {
// convert the service's annotations to an equivalent label selector
annotations := labels.Set(service.Annotations)
// include service if its annotations match the selector
if selector.Matches(annotations) {
filteredList = append(filteredList, service)
}
}
return filteredList, nil
}
// filterByServiceType filters services according their types
func (sc *serviceSource) filterByServiceType(services []*v1.Service) []*v1.Service {
filteredList := []*v1.Service{}
for _, service := range services {
// Check if the service is of the given type or not
if _, ok := sc.serviceTypeFilter[string(service.Spec.Type)]; ok {
filteredList = append(filteredList, service)
}
}
return filteredList
}
func (sc *serviceSource) setResourceLabel(service *v1.Service, endpoints []*endpoint.Endpoint) {
for _, ep := range endpoints {
ep.Labels[endpoint.ResourceLabelKey] = fmt.Sprintf("service/%s/%s", service.Namespace, service.Name)
}
}
func (sc *serviceSource) generateEndpoints(svc *v1.Service, hostname string, providerSpecific endpoint.ProviderSpecific, setIdentifier string, useClusterIP bool) (endpoints []*endpoint.Endpoint) {
hostname = strings.TrimSuffix(hostname, ".")
resource := fmt.Sprintf("service/%s/%s", svc.Namespace, svc.Name)
ttl := getTTLFromAnnotations(svc.Annotations, resource)
targets := getTargetsFromTargetAnnotation(svc.Annotations)
if len(targets) == 0 {
switch svc.Spec.Type {
case v1.ServiceTypeLoadBalancer:
if useClusterIP {
targets = extractServiceIps(svc)
} else {
targets = extractLoadBalancerTargets(svc, sc.resolveLoadBalancerHostname)
}
case v1.ServiceTypeClusterIP:
if svc.Spec.ClusterIP == v1.ClusterIPNone {
endpoints = append(endpoints, sc.extractHeadlessEndpoints(svc, hostname, ttl)...)
} else if useClusterIP || sc.publishInternal {
targets = extractServiceIps(svc)
}
case v1.ServiceTypeNodePort:
// add the nodeTargets and extract an SRV endpoint
var err error
targets, err = sc.extractNodePortTargets(svc)
if err != nil {
log.Errorf("Unable to extract targets from service %s/%s error: %v", svc.Namespace, svc.Name, err)
return endpoints
}
endpoints = append(endpoints, sc.extractNodePortEndpoints(svc, hostname, ttl)...)
case v1.ServiceTypeExternalName:
targets = extractServiceExternalName(svc)
}
for _, endpoint := range endpoints {
endpoint.ProviderSpecific = providerSpecific
endpoint.SetIdentifier = setIdentifier
}
}
endpoints = append(endpoints, endpointsForHostname(hostname, targets, ttl, providerSpecific, setIdentifier, resource)...)
return endpoints
}
func extractServiceIps(svc *v1.Service) endpoint.Targets {
if svc.Spec.ClusterIP == v1.ClusterIPNone {
log.Debugf("Unable to associate %s headless service with a Cluster IP", svc.Name)
return endpoint.Targets{}
}
return endpoint.Targets{svc.Spec.ClusterIP}
}
func extractServiceExternalName(svc *v1.Service) endpoint.Targets {
if len(svc.Spec.ExternalIPs) > 0 {
return svc.Spec.ExternalIPs
}
return endpoint.Targets{svc.Spec.ExternalName}
}
func extractLoadBalancerTargets(svc *v1.Service, resolveLoadBalancerHostname bool) endpoint.Targets {
if len(svc.Spec.ExternalIPs) > 0 {
return svc.Spec.ExternalIPs
}
// Create a corresponding endpoint for each configured external entrypoint.
var targets endpoint.Targets
for _, lb := range svc.Status.LoadBalancer.Ingress {
if lb.IP != "" {
targets = append(targets, lb.IP)
}
if lb.Hostname != "" {
if resolveLoadBalancerHostname {
ips, err := net.LookupIP(lb.Hostname)
if err != nil {
log.Errorf("Unable to resolve %q: %v", lb.Hostname, err)
continue
}
for _, ip := range ips {
targets = append(targets, ip.String())
}
} else {
targets = append(targets, lb.Hostname)
}
}
}
return targets
}
func isPodStatusReady(status v1.PodStatus) bool {
_, condition := getPodCondition(&status, v1.PodReady)
return condition != nil && condition.Status == v1.ConditionTrue
}
func getPodCondition(status *v1.PodStatus, conditionType v1.PodConditionType) (int, *v1.PodCondition) {
if status == nil {
return -1, nil
}
return getPodConditionFromList(status.Conditions, conditionType)
}
func getPodConditionFromList(conditions []v1.PodCondition, conditionType v1.PodConditionType) (int, *v1.PodCondition) {
if conditions == nil {
return -1, nil
}
for i := range conditions {
if conditions[i].Type == conditionType {
return i, &conditions[i]
}
}
return -1, nil
}
func (sc *serviceSource) extractNodePortTargets(svc *v1.Service) (endpoint.Targets, error) {
var (
internalIPs endpoint.Targets
externalIPs endpoint.Targets
ipv6IPs endpoint.Targets
nodes []*v1.Node
err error
)
switch svc.Spec.ExternalTrafficPolicy {
case v1.ServiceExternalTrafficPolicyTypeLocal:
nodesMap := map[*v1.Node]struct{}{}
labelSelector, err := metav1.ParseToLabelSelector(labels.Set(svc.Spec.Selector).AsSelectorPreValidated().String())
if err != nil {
return nil, err
}
selector, err := metav1.LabelSelectorAsSelector(labelSelector)
if err != nil {
return nil, err
}
pods, err := sc.podInformer.Lister().Pods(svc.Namespace).List(selector)
if err != nil {
return nil, err
}
var nodesReady []*v1.Node
var nodesRunning []*v1.Node
for _, v := range pods {
if v.Status.Phase == v1.PodRunning {
node, err := sc.nodeInformer.Lister().Get(v.Spec.NodeName)
if err != nil {
log.Debugf("Unable to find node where Pod %s is running", v.Spec.Hostname)
continue
}
if _, ok := nodesMap[node]; !ok {
nodesMap[node] = *new(struct{})
nodesRunning = append(nodesRunning, node)
if isPodStatusReady(v.Status) {
nodesReady = append(nodesReady, node)
// Check pod not terminating
if v.GetDeletionTimestamp() == nil {
nodes = append(nodes, node)
}
}
}
}
}
if len(nodes) > 0 {
// Works same as service endpoints
} else if len(nodesReady) > 0 {
// 2 level of panic modes as safe guard, because old wrong behavior can be used by someone
// Publish all endpoints not always a bad thing
log.Debugf("All pods in terminating state, use ready")
nodes = nodesReady
} else {
log.Debugf("All pods not ready, use all running")
nodes = nodesRunning
}
default:
nodes, err = sc.nodeInformer.Lister().List(labels.Everything())
if err != nil {
return nil, err
}
}
for _, node := range nodes {
for _, address := range node.Status.Addresses {
switch address.Type {
case v1.NodeExternalIP:
externalIPs = append(externalIPs, address.Address)
case v1.NodeInternalIP:
internalIPs = append(internalIPs, address.Address)
if suitableType(address.Address) == endpoint.RecordTypeAAAA {
ipv6IPs = append(ipv6IPs, address.Address)
}
}
}
}
access := getAccessFromAnnotations(svc.Annotations)
if access == "public" {
return append(externalIPs, ipv6IPs...), nil
}
if access == "private" {
return internalIPs, nil
}
if len(externalIPs) > 0 {
return append(externalIPs, ipv6IPs...), nil
}
return internalIPs, nil
}
func (sc *serviceSource) extractNodePortEndpoints(svc *v1.Service, hostname string, ttl endpoint.TTL) []*endpoint.Endpoint {
var endpoints []*endpoint.Endpoint
for _, port := range svc.Spec.Ports {
if port.NodePort > 0 {
// following the RFC 2782, SRV record must have a following format
// _service._proto.name. TTL class SRV priority weight port
// see https://en.wikipedia.org/wiki/SRV_record
// build a target with a priority of 0, weight of 50, and pointing the given port on the given host
target := fmt.Sprintf("0 50 %d %s", port.NodePort, hostname)
// take the service name from the K8s Service object
// it is safe to use since it is DNS compatible
// see https://kubernetes.io/docs/concepts/overview/working-with-objects/names/#dns-label-names
serviceName := svc.ObjectMeta.Name
// figure out the protocol
protocol := strings.ToLower(string(port.Protocol))
if protocol == "" {
protocol = "tcp"
}
recordName := fmt.Sprintf("_%s._%s.%s", serviceName, protocol, hostname)
var ep *endpoint.Endpoint
if ttl.IsConfigured() {
ep = endpoint.NewEndpointWithTTL(recordName, endpoint.RecordTypeSRV, ttl, target)
} else {
ep = endpoint.NewEndpoint(recordName, endpoint.RecordTypeSRV, target)
}
if ep != nil {
endpoints = append(endpoints, ep)
}
}
}
return endpoints
}
func (sc *serviceSource) AddEventHandler(ctx context.Context, handler func()) {
log.Debug("Adding event handler for service")
// Right now there is no way to remove event handler from informer, see:
// https://github.com/kubernetes/kubernetes/issues/79610
sc.serviceInformer.Informer().AddEventHandler(eventHandlerFunc(handler))
}