Improve resource usage in nginx controller

core/pkg/ingress/store/main.go

@@ -19,7 +19,7 @@ package store
 import (
 	"fmt"
 
-	api "k8s.io/api/core/v1"
+	apiv1 "k8s.io/api/core/v1"
 	"k8s.io/client-go/tools/cache"
 )
 
@@ -29,20 +29,56 @@ type IngressLister struct {
 }
 
 // SecretsLister makes a Store that lists Secrets.
-type SecretsLister struct {
+type SecretLister struct {
 	cache.Store
 }
 
+// GetByName searches for a secret in the local secrets Store
+func (sl *SecretLister) GetByName(name string) (*apiv1.Secret, error) {
+	s, exists, err := sl.GetByKey(name)
+	if err != nil {
+		return nil, err
+	}
+	if !exists {
+		return nil, fmt.Errorf("secret %v was not found", name)
+	}
+	return s.(*apiv1.Secret), nil
+}
+
 // ConfigMapLister makes a Store that lists Configmaps.
 type ConfigMapLister struct {
 	cache.Store
 }
 
+// GetByName searches for a configmap in the local configmaps Store
+func (cml *ConfigMapLister) GetByName(name string) (*apiv1.ConfigMap, error) {
+	s, exists, err := cml.GetByKey(name)
+	if err != nil {
+		return nil, err
+	}
+	if !exists {
+		return nil, fmt.Errorf("configmap %v was not found", name)
+	}
+	return s.(*apiv1.ConfigMap), nil
+}
+
 // ServiceLister makes a Store that lists Services.
 type ServiceLister struct {
 	cache.Store
 }
 
+// GetByName searches for a service in the local secrets Store
+func (sl *ServiceLister) GetByName(name string) (*apiv1.Service, error) {
+	s, exists, err := sl.GetByKey(name)
+	if err != nil {
+		return nil, err
+	}
+	if !exists {
+		return nil, fmt.Errorf("service %v was not found", name)
+	}
+	return s.(*apiv1.Service), nil
+}
+
 // NodeLister makes a Store that lists Nodes.
 type NodeLister struct {
 	cache.Store
@@ -54,9 +90,9 @@ type EndpointLister struct {
 }
 
 // GetServiceEndpoints returns the endpoints of a service, matched on service name.
-func (s *EndpointLister) GetServiceEndpoints(svc *api.Service) (ep api.Endpoints, err error) {
+func (s *EndpointLister) GetServiceEndpoints(svc *apiv1.Service) (ep apiv1.Endpoints, err error) {
 	for _, m := range s.Store.List() {
-		ep = *m.(*api.Endpoints)
+		ep = *m.(*apiv1.Endpoints)
 		if svc.Name == ep.Name && svc.Namespace == ep.Namespace {
 			return ep, nil
 		}
@@ -64,8 +100,3 @@ func (s *EndpointLister) GetServiceEndpoints(svc *api.Service) (ep api.Endpoints
 	err = fmt.Errorf("could not find endpoints for service: %v", svc.Name)
 	return
 }
-
-// SecretLister makes a Store that lists Secres.
-type SecretLister struct {
-	cache.Store
-}