ASP.NET Core Api网关Ocelot的使用初探

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

代码地址

https://gitee.com/conanOpenSource_admin/Example/commit/b3b5a6b15a060b46c5ecd2ea31f0d36791cda18c

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