server/grpc: fix ordering of register and check for registered (#1338)

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

server/grpc/grpc.go

@@ -659,11 +659,13 @@ func (g *grpcServer) Register() error {
 	registered := g.registered
 	g.Unlock()
 
-	if !registered {
+	if registered {
+		return nil
+	}
+
 	if logger.V(logger.InfoLevel, logger.DefaultLogger) {
 		logger.Infof("Registry [%s] Registering node: %s", config.Registry.String(), node.Id)
 	}
-	}
 
 	// create registry options
 	rOpts := []registry.RegisterOption{registry.RegisterTTL(config.RegisterTTL)}
@@ -672,11 +674,6 @@ func (g *grpcServer) Register() error {
 		return err
 	}
 
-	// already registered? don't need to register subscribers
-	if registered {
-		return nil
-	}
-
 	g.Lock()
 	defer g.Unlock()
 
@@ -787,10 +784,10 @@ func (g *grpcServer) Start() error {
 		g.RUnlock()
 		return nil
 	}
-	g.RUnlock()
-
 	config := g.Options()
 
+	g.RUnlock()
+
 	// micro: config.Transport.Listen(config.Address)
 	var ts net.Listener
 
@@ -822,10 +819,11 @@ func (g *grpcServer) Start() error {
 	}
 	g.Lock()
 	g.opts.Address = ts.Addr().String()
+	subscribes := g.subscribers
 	g.Unlock()
 
 	// only connect if we're subscribed
-	if len(g.subscribers) > 0 {
+	if len(subscribes) > 0 {
 		// connect to the broker
 		if err := config.Broker.Connect(); err != nil {
 			return err