grpc/rpcerror/grpc.go
func StreamServerInterceptor(fn ConvertFunc) grpc.StreamServerInterceptor {
	return func(srv interface{}, ss grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) (err error) {
		return fn(handler(srv, ss))
	}
}
func StreamServerInterceptor(fn ConvertFunc) grpc.StreamServerInterceptor {
	return func(srv interface{}, ss grpc.ServerStream, info *grpc.StreamServerInfo, handler grpc.StreamHandler) (err error) {
		return fn(handler(srv, ss))
	}
}
// StreamServerInterceptor applies fn to errors returned by server.