.Net Core微服务入门全纪录（完结）——Ocelot与Swagger

2022-09-16 21:17:24

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前言

上一篇【.Net Core微服务入门全纪录（八）——Docker Compose与容器网络】完成了docker-compose.yml文件的编写，最后使用docker compose的一个up指令即可在docker中运行整个复杂的环境。本篇简单介绍一下Ocelot与Swagger的集成，方便在网关项目中统一查看各个服务的api文档。

开始

首先，网关项目，服务项目 NuGet安装Swashbuckle.AspNetCore：

服务项目

Order.API项目Startup：

public void ConfigureServices(IServiceCollection services)
{
    services.AddSwaggerGen(c =>
    {
        c.SwaggerDoc("v1", new OpenApiInfo { Title = "Order API", Version = "v1", Description = "# order service api..." });
        // Set the comments path for the Swagger JSON and UI.
        var xmlFile = $"{Assembly.GetExecutingAssembly().GetName().Name}.xml";
        var xmlPath = Path.Combine(AppContext.BaseDirectory, xmlFile);
        c.IncludeXmlComments(xmlPath);
        c.AddSecurityDefinition("Bearer", new OpenApiSecurityScheme()
        {
            Description = "在下框中输入请求头中需要添加Jwt授权Token：Bearer Token",
            Name = "Authorization",
            In = ParameterLocation.Header,
            Type = SecuritySchemeType.ApiKey,
            BearerFormat = "JWT",
            Scheme = "Bearer"
        });

        c.AddSecurityRequirement(new OpenApiSecurityRequirement
        {
            {
                new OpenApiSecurityScheme{
                    Reference = new OpenApiReference {
                        Type = ReferenceType.SecurityScheme,
                        Id = "Bearer"}
                },new string[] { }
            }
        });
    });

    services.AddControllers();

    ......
}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env, IHostApplicationLifetime lifetime, OrderContext orderContext)
{
    ......

    app.UseSwagger();
    app.UseSwaggerUI(c =>
    {
        c.SwaggerEndpoint("/swagger/v1/swagger.json", "Order API V1");
    });

    app.UseRouting();

    ......
}

打开项目文件Order.API.csproj，添加生成文档的配置，swagger要用到：

<GenerateDocumentationFile>true</GenerateDocumentationFile>
<NoWarn>$(NoWarn);1591</NoWarn>

Product.API项目也是类似的修改，就不贴了。

网关项目

然后是Ocelot网关项目的Startup：

public void ConfigureServices(IServiceCollection services)
{
    services.AddSwaggerGen(c =>
    {
        c.SwaggerDoc("v1",
            new OpenApiInfo {Title = "Gateway API", Version = "v1", Description = "# gateway api..."});
    });

    services.AddControllers();

    ......
}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    app.UseSwagger();
    app.UseSwaggerUI(c =>
    {
        c.SwaggerEndpoint("/order/swagger/v1/swagger.json", "Order API V1");
        c.SwaggerEndpoint("/product/swagger/v1/swagger.json", "Product API V1");
    });

    //设置Ocelot中间件
    app.UseOcelot().Wait();
}

ocelot.json配置文件，Routes节点下增加2个路由配置，不做授权，限流，熔断等限制：

{
  "DownstreamPathTemplate": "/swagger/v1/swagger.json",
  "DownstreamScheme": "http",
  "UpstreamPathTemplate": "/product/swagger/v1/swagger.json",
  "UpstreamHttpMethod": [ "Get" ],
  "ServiceName": "ProductService",
  "LoadBalancerOptions": {
    "Type": "RoundRobin"
  }
},
{
  "DownstreamPathTemplate": "/swagger/v1/swagger.json",
  "DownstreamScheme": "http",
  "UpstreamPathTemplate": "/order/swagger/v1/swagger.json",
  "UpstreamHttpMethod": [ "Get" ],
  "ServiceName": "OrderService",
  "LoadBalancerOptions": {
    "Type": "RoundRobin"
  }
}

运行测试

使用docker-compose build：

build完成后启动：

浏览器访问网关项目：http://localhost:9070/swagger

接口测试：

此时因为没有授权所以返回401，为了方便获取token，我在IDS4.AuthCenter项目增加了一个客户端配置：

new Client
{
    ClientId = "postman client",
    ClientName = "Postman Client",

    AllowedGrantTypes = GrantTypes.ClientCredentials,
    ClientSecrets = { new Secret("postman client secret".Sha256()) },

    AllowedScopes = new [] {"orderApiScope", "productApiScope"},
}

使用postman获取token：