Lister refactor kubernetes/kubernetes#33269

middleware/kubernetes/controller.go

@@ -66,12 +66,15 @@ func newdnsController(kubeClient *client.Client, resyncPeriod time.Duration, lse
 		},
 		&api.Endpoints{}, resyncPeriod, cache.ResourceEventHandlerFuncs{})
 
-	dns.svcLister.Store, dns.svcController = cache.NewInformer(
+	dns.svcLister.Indexer, dns.svcController = cache.NewIndexerInformer(
 		&cache.ListWatch{
 			ListFunc:  serviceListFunc(dns.client, namespace, dns.selector),
 			WatchFunc: serviceWatchFunc(dns.client, namespace, dns.selector),
 		},
-		&api.Service{}, resyncPeriod, cache.ResourceEventHandlerFuncs{})
+		&api.Service{},
+		resyncPeriod,
+		cache.ResourceEventHandlerFuncs{},
+		cache.Indexers{cache.NamespaceIndex: cache.MetaNamespaceIndexFunc})
 
 	dns.nsLister.Store, dns.nsController = cache.NewInformer(
 		&cache.ListWatch{
@@ -174,27 +177,23 @@ func (dns *dnsController) GetNamespaceList() *api.NamespaceList {
 	return &nsList
 }
 
-func (dns *dnsController) GetServiceList() *api.ServiceList {
-	svcList, err := dns.svcLister.List()
+func (dns *dnsController) GetServiceList() []*api.Service {
+	svcs, err := dns.svcLister.List(labels.Everything())
 	if err != nil {
-		return &api.ServiceList{}
+		return []*api.Service{}
 	}
 
-	return &svcList
+	return svcs
 }
 
 // GetServicesByNamespace returns a map of
 // namespacename :: [ kubernetesService ]
 func (dns *dnsController) GetServicesByNamespace() map[string][]api.Service {
 	k8sServiceList := dns.GetServiceList()
-	if k8sServiceList == nil {
-		return nil
-	}
-
-	items := make(map[string][]api.Service, len(k8sServiceList.Items))
-	for _, i := range k8sServiceList.Items {
+	items := make(map[string][]api.Service, len(k8sServiceList))
+	for _, i := range k8sServiceList {
 		namespace := i.Namespace
-		items[namespace] = append(items[namespace], i)
+		items[namespace] = append(items[namespace], *i)
 	}
 
 	return items
@@ -203,18 +202,10 @@ func (dns *dnsController) GetServicesByNamespace() map[string][]api.Service {
 // GetServiceInNamespace returns the Service that matches
 // servicename in the namespace
 func (dns *dnsController) GetServiceInNamespace(namespace string, servicename string) *api.Service {
-	svcKey := fmt.Sprintf("%v/%v", namespace, servicename)
-	svcObj, svcExists, err := dns.svcLister.Store.GetByKey(svcKey)
-
+	svcObj, err := dns.svcLister.Services(namespace).Get(servicename)
 	if err != nil {
 		// TODO(...): should return err here
 		return nil
 	}
-
-	if !svcExists {
-		// TODO(...): should return err here
-		return nil
-	}
-
-	return svcObj.(*api.Service)
+	return svcObj
 }

middleware/kubernetes/kubernetes.go

@@ -159,7 +159,7 @@ func (k *Kubernetes) Records(name string, exact bool) ([]msg.Service, error) {
 }
 
 // TODO: assemble name from parts found in k8s data based on name template rather than reusing query string
-func (k *Kubernetes) getRecordsForServiceItems(serviceItems []api.Service, values nametemplate.NameValues) []msg.Service {
+func (k *Kubernetes) getRecordsForServiceItems(serviceItems []*api.Service, values nametemplate.NameValues) []msg.Service {
 	var records []msg.Service
 
 	for _, item := range serviceItems {
@@ -182,12 +182,12 @@ func (k *Kubernetes) getRecordsForServiceItems(serviceItems []api.Service, value
 }
 
 // Get performs the call to the Kubernetes http API.
-func (k *Kubernetes) Get(namespace string, nsWildcard bool, servicename string, serviceWildcard bool) ([]api.Service, error) {
+func (k *Kubernetes) Get(namespace string, nsWildcard bool, servicename string, serviceWildcard bool) ([]*api.Service, error) {
 	serviceList := k.APIConn.GetServiceList()
 
-	var resultItems []api.Service
+	var resultItems []*api.Service
 
-	for _, item := range serviceList.Items {
+	for _, item := range serviceList {
 		if symbolMatches(namespace, item.Namespace, nsWildcard) && symbolMatches(servicename, item.Name, serviceWildcard) {
 			// If namespace has a wildcard, filter results against Corefile namespace list.
 			// (Namespaces without a wildcard were filtered before the call to this function.)
@@ -220,11 +220,11 @@ func isKubernetesNameError(err error) bool {
 }
 
 func (k *Kubernetes) getServiceRecordForIP(ip, name string) []msg.Service {
-	svcList, err := k.APIConn.svcLister.List()
+	svcList, err := k.APIConn.svcLister.List(labels.Everything())
 	if err != nil {
 		return nil
 	}
-	for _, service := range svcList.Items {
+	for _, service := range svcList {
 		if service.Spec.ClusterIP == ip {
 			return []msg.Service{msg.Service{Host: ip}}
 		}

middleware/pkg/strings/slice_test.go

-package strings
-
-import (
-	"testing"
-)
-
-type InSliceData struct {
-	Slice   []string
-	String  string
-	InSlice bool
-}
-
-// Test data for TestStringInSlice cases.
-var testdataInSlice = []struct {
-	Slice          []string
-	String         string
-	ExpectedResult bool
-}{
-	{[]string{"a", "b", "c"}, "a", true},
-	{[]string{"a", "b", "c"}, "d", false},
-	{[]string{"a", "b", "c"}, "", false},
-	{[]string{}, "a", false},
-	{[]string{}, "", false},
-}
-
-func TestStringInSlice(t *testing.T) {
-	for _, example := range testdataInSlice {
-		actualResult := StringInSlice(example.String, example.Slice)
-		if actualResult != example.ExpectedResult {
-			t.Errorf("Expected stringInSlice result '%v' for example string='%v', slice='%v'. Instead got result '%v'.", example.ExpectedResult, example.String, example.Slice, actualResult)
-		}
-	}
-}