（一）Eshop（异常处理中间件）

文章目录

项目地址
一、异常处理
- [1.1 自定异常](#1.1 自定异常)
- [1.2 自定义异常处理中间件](#1.2 自定义异常处理中间件)
- [1.3 注册中间件](#1.3 注册中间件)
二、grpc服务
- [2.1 创建protos](#2.1 创建protos)
- - [1. 打折的protos](#1. 打折的protos)
  - [2. 设置grpc server](#2. 设置grpc server)
  - [3. program配置服务](#3. program配置服务)
  - [4. docker-compose](#4. docker-compose)
- [2.2 CRUD](#2.2 CRUD)
- - [1. 查询](#1. 查询)
- [2.3 测试](#2.3 测试)
- - [1. 发起查询请求](#1. 发起查询请求)
三、grpc服务消费
- [3.1 创建client](#3.1 创建client)
- - [1. 添加服务](#1. 添加服务)
  - [2. 选择需要添加的服务类型](#2. 选择需要添加的服务类型)
  - [3. 选择服务路径](#3. 选择服务路径)
  - [4. 添加成功后](#4. 添加成功后)
  - [5. Program里添加Client服务](#5. Program里添加Client服务)
  - [6. appSettings里添加grpc服务地址](#6. appSettings里添加grpc服务地址)
- [3.2 grpc通讯](#3.2 grpc通讯)
- - [1. 在StoreBasketCommandHandler使用](#1. 在StoreBasketCommandHandler使用)

项目地址

教程作者：
教程地址：

复制代码

代码仓库地址：

复制代码

所用到的框架和插件：

dbt
airflow

一、异常处理

1.1 自定异常

BadRequestException
InternalServerException
NotFoundException

1.2 自定义异常处理中间件

异常处理中间件

cs 复制代码

public class CustomExceptionHandler
    (ILogger<CustomExceptionHandler> logger)
    : IExceptionHandler
{
    public async ValueTask<bool> TryHandleAsync(HttpContext context, Exception exception, CancellationToken cancellationToken)
    {
        logger.LogError(
            "Error Message: {exceptionMessage}, Time of occurrence {time}",
            exception.Message, DateTime.UtcNow);

        (string Detail, string Title, int StatusCode) details = exception switch
        {
            InternalServerException =>
            (
                exception.Message,
                exception.GetType().Name,
                context.Response.StatusCode = StatusCodes.Status500InternalServerError
            ),
            ValidationException =>
            (
                exception.Message,
                exception.GetType().Name,
                context.Response.StatusCode = StatusCodes.Status400BadRequest
            ),
            BadRequestException =>
            (
                exception.Message,
                exception.GetType().Name,
                context.Response.StatusCode = StatusCodes.Status400BadRequest
            ),
            NotFoundException =>
            (
                exception.Message,
                exception.GetType().Name,
                context.Response.StatusCode = StatusCodes.Status404NotFound
            ),
            _ =>
            (
                exception.Message,
                exception.GetType().Name,
                context.Response.StatusCode = StatusCodes.Status500InternalServerError
            )
        };

        var problemDetails = new ProblemDetails
        {
            Title = details.Title,
            Detail = details.Detail,
            Status = details.StatusCode,
            Instance = context.Request.Path
        };

        problemDetails.Extensions.Add("traceId", context.TraceIdentifier);

        if (exception is ValidationException validationException)
        {
            problemDetails.Extensions.Add("ValidationErrors", validationException.Errors);
        }

        await context.Response.WriteAsJsonAsync(problemDetails, cancellationToken: cancellationToken);
        return true;
    }
}

返回例

{
"title": "ValidationException",
"detail": "参数验证失败",
"status": 400,
"instance": "/api/products",
"traceId": "00-9d4a78437e-abc123def456-01",
"ValidationErrors": [
{
"PropertyName": "Name",
"ErrorMessage": "Name 不能为空"
},
{
"PropertyName": "Age",
"ErrorMessage": "Age 必须大于 0"
}
]
}

1.3 注册中间件

给所有微服务注册

二、grpc服务

土耳其146

这里主要实现了discount模块的grpc，我们可以通过api进行增删改查

2.1 创建protos

1. 打折的protos

定义请求和返回值

syntax = "proto3";

option csharp_namespace = "Discount.Grpc";

package discount;

// The discount service definition.
service DiscountProtoService {
// Discount CRUD Operations
rpc GetDiscount (GetDiscountRequest) returns (CouponModel);
rpc CreateDiscount (CreateDiscountRequest) returns (CouponModel);
rpc UpdateDiscount (UpdateDiscountRequest) returns (CouponModel);
rpc DeleteDiscount (DeleteDiscountRequest) returns (DeleteDiscountResponse);
}

message GetDiscountRequest {
string productName = 1;
}

message CouponModel {
int32 id = 1;
string productName = 2;
string description = 3;
int32 amount = 4;
}

message CreateDiscountRequest {
CouponModel coupon = 1;
}

message UpdateDiscountRequest {
CouponModel coupon = 1;
}

message DeleteDiscountRequest {
string productName = 1;
}

message DeleteDiscountResponse {
bool success = 1;
}