一日一技：ASP.NET Core Api网关Ocelot初探

概述

Ocelot面向使用.NET运行微型服务/面向服务的体系结构的人员，这些体系结构需要在系统中具有统一的入口点。特别是我想与IdentityServer参考和承载令牌轻松集成。Ocelot是按特定顺序排列的一堆中间件。Ocelot将HttpRequest对象操作到由其配置指定的状态，直到到达请求构建器中间件，在该中间件中它创建一个HttpRequestMessage对象，该对象用于向下游服务发出请求。发出请求的中间件是Ocelot管道中的最后一件事。它不会调用下一个中间件。有一块中间件可将HttpResponseMessage映射到HttpResponse对象，然后将其返回给客户端。基本上，它具有许多其他功能。

代码实现

1、新建api客户端1

2、新建api 网关test

3、nuget安装Ocelot

4、Program文件添加ConfigureAppConfiguration

  public class Program{public static void Main(string[] args){CreateHostBuilder(args).Build().Run();}public static IHostBuilder CreateHostBuilder(string[] args) =>Host.CreateDefaultBuilder(args).ConfigureAppConfiguration(conf =>{conf.AddJsonFile("ocelot.json", false, true);}).ConfigureWebHostDefaults(webBuilder =>{webBuilder.UseStartup<Startup>();});}

5、Startup文件配置

   services.AddOcelot(Configuration);

   app.UseOcelot().Wait();

6、网关项目下添加文件ocelot.json

{"ReRoutes": [{"DownstreamPathTemplate": "/api/WeatherForecast/GetList","DownstreamScheme": "http","DownstreamHostAndPorts": [{"Host": "localhost","Port": 5000}],"UpstreamPathTemplate": "/GetList","UpstreamHttpMethod": [ "Get" ]},{"DownstreamPathTemplate": "/{everything}","DownstreamScheme": "http","DownstreamHostAndPorts": [{"Host": "localhost","Port": 5000}],"UpstreamPathTemplate": "/{everything}","UpstreamHttpMethod": [ "Post" ]},{"DownstreamPathTemplate": "/api/WeatherForecast/GetModel?id={s1}","DownstreamScheme": "http","DownstreamHostAndPorts": [{"Host": "localhost","Port": 5000}],"UpstreamPathTemplate": "/GetModel?id={s1}","UpstreamHttpMethod": [ "Get" ]}]
}

7、2个项目运行，测试