reflect call method grpc method

grpc.go

// CallUnary
// [3]reflect.Value in[0] is context.Context, in[1] is your message type which generated by pb file.
// in[2] is grpc.CallOption
func (c *Client) CallUnary(methodName string,in []reflect.Value)(interface{},error) {
	m, ok := reflect.TypeOf(c.c).MethodByName(methodName)
	if !ok{
		log.Fatal("method not found")
		return nil,errors.New("method not found")
	}

	if len(in) != 3{
		return nil, errors.New("mistake arguement")
	}
	out:= m.Func.Call(in)

	if len(out) != 2{
		return nil, errors.New("mistake method")
	}

	return out[0].Interface(),out[1].Interface().(error)
}