Fix invoke for when no namespace is given

Tested e2e with the operator on Kubernetes 1.14, also tested
with the current version of faas-netes, which has the namespace
endpoint.

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

cmd/tester/main.go

@@ -15,10 +15,12 @@ import (
 
 func main() {
 
-	var username, password string
+	var username, password, gateway string
 
 	flag.StringVar(&username, "username", "admin", "username")
 	flag.StringVar(&password, "password", "", "password")
+	flag.StringVar(&gateway, "gateway", "http://127.0.0.1:8080", "gateway")
+
 	flag.Parse()
 
 	creds := &auth.BasicAuthCredentials{
@@ -28,7 +30,7 @@ func main() {
 
 	config := &types.ControllerConfig{
 		RebuildInterval:   time.Millisecond * 1000,
-		GatewayURL:        "http://127.0.0.1:8080",
+		GatewayURL:        gateway,
 		PrintResponse:     true,
 		PrintResponseBody: true,
 	}
@@ -42,11 +44,11 @@ func main() {
 
 	// Simulate events emitting from queue/pub-sub
 	for {
+		log.Printf("Invoking on topic vm.powered.on - %s\n", gateway)
 		time.Sleep(2 * time.Second)
 		data := []byte("test " + time.Now().String())
 		controller.Invoke("vm.powered.on", &data)
 	}
-
 }
 
 // ResponseReceiver enables connector to receive results from the

types/function_list_builder.go

@@ -113,15 +113,23 @@ func (s *FunctionLookupBuilder) Build() (map[string][]string, error) {
 	if err != nil {
 		return map[string][]string{}, err
 	}
-
 	serviceMap := make(map[string][]string)
 
-	for _, namespace := range namespaces {
+	if len(namespaces) == 0 {
+		namespace := ""
 		functions, err := s.getFunctions(namespace)
 		if err != nil {
 			return map[string][]string{}, err
 		}
 		serviceMap = buildServiceMap(&functions, s.TopicDelimiter, namespace, serviceMap)
+	} else {
+		for _, namespace := range namespaces {
+			functions, err := s.getFunctions(namespace)
+			if err != nil {
+				return map[string][]string{}, err
+			}
+			serviceMap = buildServiceMap(&functions, s.TopicDelimiter, namespace, serviceMap)
+		}
 	}
 
 	return serviceMap, err
@@ -161,8 +169,12 @@ func appendServiceMap(key, function, namespace string, sm map[string][]string) m
 		if sm[key] == nil {
 			sm[key] = []string{}
 		}
+		sep := ""
+		if len(namespace) > 0 {
+			sep = "."
+		}
 
-		functionPath := fmt.Sprintf("%s.%s", function, namespace) // add namespaces support
+		functionPath := fmt.Sprintf("%s%s%s", function, sep, namespace)
 		sm[key] = append(sm[key], functionPath)
 	}
 

types/topic_map.go

@@ -3,7 +3,9 @@
 
 package types
 
-import "sync"
+import (
+	"sync"
+)
 
 func NewTopicMap() TopicMap {
 	lookup := make(map[string][]string)