util/rpcsrv/server.go
func (s *Server) AddHandler(namespace string, handler interface{}) error {
	return s.rpcsrv.RegisterName(namespace, handler)
}
func (s *Server) AddHandler(namespace string, handler interface{}) error {
	return s.rpcsrv.RegisterName(namespace, handler)
}
// AddHandler registers a new RPC handler in a given namespace.