Simplify Service Lookup

Since we already know the name and namespace
of the service(s) we want we can just get the
correct one back from the API without filtering
the results.

provider/k8s/client.go

@@ -16,12 +16,13 @@ const (
 	APIEndpoint        = "/api/v1"
 	extentionsEndpoint = "/apis/extensions/v1beta1"
 	defaultIngress     = "/ingresses"
+	namespaces         = "/namespaces/"
 )
 
 // Client is a client for the Kubernetes master.
 type Client interface {
 	GetIngresses(predicate func(Ingress) bool) ([]Ingress, error)
-	GetServices(predicate func(Service) bool) ([]Service, error)
+	GetService(name, namespace string) (Service, error)
 	GetEndpoints(name, namespace string) (Endpoints, error)
 	WatchAll(stopCh <-chan bool) (chan interface{}, chan error, error)
 }
@@ -77,26 +78,20 @@ func (c *clientImpl) WatchIngresses(stopCh <-chan bool) (chan interface{}, chan
 	return c.watch(getURL, stopCh)
 }
 
-// GetServices returns all services in the cluster
+// GetService returns the named service from the named namespace
-func (c *clientImpl) GetServices(predicate func(Service) bool) ([]Service, error) {
+func (c *clientImpl) GetService(name, namespace string) (Service, error) {
-	getURL := c.endpointURL + APIEndpoint + "/services"
+	getURL := c.endpointURL + APIEndpoint + namespaces + namespace + "/services/" + name
 
 	body, err := c.do(c.request(getURL))
 	if err != nil {
-		return nil, fmt.Errorf("failed to create services request: GET %q : %v", getURL, err)
+		return Service{}, fmt.Errorf("failed to create services request: GET %q : %v", getURL, err)
 	}
 
-	var serviceList ServiceList
+	var service Service
-	if err := json.Unmarshal(body, &serviceList); err != nil {
+	if err := json.Unmarshal(body, &service); err != nil {
-		return nil, fmt.Errorf("failed to decode list of services resources: %v", err)
+		return Service{}, fmt.Errorf("failed to decode service resource: %v", err)
 	}
-	services := serviceList.Items[:0]
+	return service, nil
-	for _, service := range serviceList.Items {
-		if predicate(service) {
-			services = append(services, service)
-		}
-	}
-	return services, nil
 }
 
 // WatchServices returns all services in the cluster
@@ -108,7 +103,7 @@ func (c *clientImpl) WatchServices(stopCh <-chan bool) (chan interface{}, chan e
 // GetEndpoints returns the named Endpoints
 // Endpoints have the same name as the coresponding service
 func (c *clientImpl) GetEndpoints(name, namespace string) (Endpoints, error) {
-	getURL := c.endpointURL + APIEndpoint + "/namespaces/" + namespace + "/endpoints/" + name
+	getURL := c.endpointURL + APIEndpoint + namespaces + namespace + "/endpoints/" + name
 
 	body, err := c.do(c.request(getURL))
 	if err != nil {

provider/kubernetes.go

@@ -190,19 +190,13 @@ func (provider *Kubernetes) loadIngresses(k8sClient k8s.Client) (*types.Configur
 						Rule: ruleType + ":" + pa.Path,
 					}
 				}
-				services, err := k8sClient.GetServices(func(service k8s.Service) bool {
+				service, err := k8sClient.GetService(pa.Backend.ServiceName, i.ObjectMeta.Namespace)
-					return service.ObjectMeta.Namespace == i.ObjectMeta.Namespace && service.Name == pa.Backend.ServiceName
-				})
 				if err != nil {
 					log.Warnf("Error retrieving services: %v", err)
-					continue
-				}
-				if len(services) == 0 {
-					// no backends found, delete frontend...
 					delete(templateObjects.Frontends, r.Host+pa.Path)
 					log.Warnf("Error retrieving services %s", pa.Backend.ServiceName)
+					continue
 				}
-				for _, service := range services {
 				protocol := "http"
 				for _, port := range service.Spec.Ports {
 					if equalPorts(port, pa.Backend.ServicePort) {
@@ -237,7 +231,6 @@ func (provider *Kubernetes) loadIngresses(k8sClient k8s.Client) (*types.Configur
 			}
 		}
 	}
-	}
 	return &templateObjects, nil
 }
 

provider/kubernetes_test.go

@@ -1212,14 +1212,13 @@ func (c clientMock) GetIngresses(predicate func(k8s.Ingress) bool) ([]k8s.Ingres
 func (c clientMock) WatchIngresses(predicate func(k8s.Ingress) bool, stopCh <-chan bool) (chan interface{}, chan error, error) {
 	return c.watchChan, make(chan error), nil
 }
-func (c clientMock) GetServices(predicate func(k8s.Service) bool) ([]k8s.Service, error) {
+func (c clientMock) GetService(name, namespace string) (k8s.Service, error) {
-	var services []k8s.Service
 	for _, service := range c.services {
-		if predicate(service) {
+		if service.Namespace == namespace && service.Name == name {
-			services = append(services, service)
+			return service, nil
 		}
 	}
-	return services, nil
+	return k8s.Service{}, nil
 }
 
 func (c clientMock) GetEndpoints(name, namespace string) (k8s.Endpoints, error) {