自定义错误码

// 自定义错误响应编码器, 统一错误的响应结构
func customEncodeErrorFunc(w http.ResponseWriter, r *http.Request, err error) {
	if err == nil {
		return
	}

	// 判断是否是gRPC的错误类型
	var response *httpResponse
	if gs, ok := status.FromError(err); ok {
		response = &httpResponse{
			Code: krstatus.FromGRPCCode(gs.Code()),
			Msg:  gs.Message(),
		}
	} else {
		response = &httpResponse{
			Code: http.StatusInternalServerError,
			Msg:  "内部错误",
		}
	}

	codec, _ := krhttp.CodecForRequest(r, "Accept")
	// 将自定义的错误结构体进行解码
	body, err := codec.Marshal(response)
	if err != nil {
		w.WriteHeader(http.StatusInternalServerError)
		return
	}
	w.Header().Set("Content-Type", fmt.Sprintf("application/%s", codec.Name()))
	// 写入错误码
	w.WriteHeader(response.Code)
	_, _ = w.Write(body)
}

opts = append(opts,http.ErrorEncoder(customEncodeErrorFunc))