optimize unknown handler

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

grpc.go

@@ -45,14 +45,15 @@ type ServerReflection struct {
 */
 
 type Server struct {
-	handlers    map[string]server.Handler
-	srv         *grpc.Server
-	exit        chan chan error
-	wg          *sync.WaitGroup
-	rsvc        *register.Service
-	subscribers map[*subscriber][]broker.Subscriber
-	rpc         *rServer
-	opts        server.Options
+	handlers       map[string]server.Handler
+	srv            *grpc.Server
+	exit           chan chan error
+	wg             *sync.WaitGroup
+	rsvc           *register.Service
+	subscribers    map[*subscriber][]broker.Subscriber
+	rpc            *rServer
+	opts           server.Options
+	unknownHandler grpc.StreamHandler
 	sync.RWMutex
 	started    bool
 	registered bool
@@ -157,6 +158,10 @@ func (g *Server) configure(opts ...server.Option) error {
 		g.reflection = v
 	}
 
+	if h, ok := g.opts.Context.Value(unknownServiceHandlerKey{}).(grpc.StreamHandler); ok {
+		g.unknownHandler = h
+	}
+
 	if restart {
 		return g.Start()
 	}
@@ -316,20 +321,16 @@ func (g *Server) handler(srv interface{}, stream grpc.ServerStream) (err error)
 	*/
 
 	if svc == nil {
-		if g.opts.Context != nil {
-			if h, ok := g.opts.Context.Value(unknownServiceHandlerKey{}).(grpc.StreamHandler); ok {
-				return h(srv, stream)
-			}
+		if g.unknownHandler != nil {
+			return g.unknownHandler(srv, stream)
 		}
 		return status.New(codes.Unimplemented, fmt.Sprintf("unknown service %s", serviceName)).Err()
 	}
 
 	mtype := svc.method[methodName]
 	if mtype == nil {
-		if g.opts.Context != nil {
-			if h, ok := g.opts.Context.Value(unknownServiceHandlerKey{}).(grpc.StreamHandler); ok {
-				return h(srv, stream)
-			}
+		if g.unknownHandler != nil {
+			return g.unknownHandler(srv, stream)
 		}
 		return status.New(codes.Unimplemented, fmt.Sprintf("unknown service method %s.%s", serviceName, methodName)).Err()
 	}
@@ -444,53 +445,8 @@ func (g *Server) processRequest(ctx context.Context, stream grpc.ServerStream, s
 	}
 
 	return status.New(statusCode, statusDesc).Err()
-	//	}
 }
 
-/*
-type reflectStream struct {
-	stream server.Stream
-}
-
-func (s *reflectStream) Send(rsp *grpcreflect.ServerReflectionResponse) error {
-	return s.stream.Send(rsp)
-}
-
-func (s *reflectStream) Recv() (*grpcreflect.ServerReflectionRequest, error) {
-	req := &grpcreflect.ServerReflectionRequest{}
-	err := s.stream.Recv(req)
-	return req, err
-}
-
-func (s *reflectStream) SetHeader(gmetadata.MD) error {
-	return nil
-}
-
-func (s *reflectStream) SendHeader(gmetadata.MD) error {
-	return nil
-}
-
-func (s *reflectStream) SetTrailer(gmetadata.MD) {
-
-}
-
-func (s *reflectStream) Context() context.Context {
-	return s.stream.Context()
-}
-
-func (s *reflectStream) SendMsg(m interface{}) error {
-	return s.stream.Send(m)
-}
-
-func (s *reflectStream) RecvMsg(m interface{}) error {
-	return s.stream.Recv(m)
-}
-
-func (g *ServerReflection) ServerReflectionInfo(ctx context.Context, stream server.Stream) error {
-	return g.s.ServerReflectionInfo(&reflectStream{stream})
-}
-*/
-
 func (g *Server) processStream(ctx context.Context, stream grpc.ServerStream, service *service, mtype *methodType, ct string) error {
 	opts := g.opts