net core Ocelot 網關 初使用（1）

新建 net core webapi 項目

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安裝 nuget 包

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```

Install-Package Ocelot

```

配置

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• 添加一個Ocelot.json的文件用來添加Ocelot的配置

• 轉發 http://localhost:53743/jsmer => http://localhost:8088

  {
  "GlobalConfiguration": {
      "BaseUrl": "http://localhost:53743"
  },
  "ReRoutes": [
      {
      "DownstreamPathTemplate": "/{postId}",
      "DownstreamScheme": "http",
      "DownstreamHostAndPorts": [
          {
          "Host": "localhost",
          "Port": 8088
          }
      ],
      "UpstreamPathTemplate": "/jsmer/{postId}",
      "UpstreamHttpMethod": [ "Get" ]
      }
  ]
  }
  

• 說明

  Downstream是下游服務配置
  UpStream是上游服務配置
  Aggregates 服務聚合配置
  ServiceName, LoadBalancer, UseServiceDiscovery 配置服務發現
  AuthenticationOptions 配置服務認證
  RouteClaimsRequirement 配置Claims鑑權
  RateLimitOptions爲限流配置
  FileCacheOptions 緩存配置
  QosOptions 服務質量與熔斷
  DownstreamHeaderTransform頭信息轉發

添加中間件

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Startup.cs

2. 代碼如下

 using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
// 添加
using Ocelot.DependencyInjection;
// 添加
using Ocelot.Middleware;

namespace JSClound.Gateway
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public IConfiguration Configuration { get; }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
       		 // 添加
            services.AddOcelot();
            
            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_2);
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseMvc();
			// 添加
            app.UseOcelot().Wait();
        }
    }
}
 }

Program.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Logging;

namespace JSClound.Gateway
{
    public class Program
    {
        public static void Main(string[] args)
        {
            BuildWebHost(args).Run();
        }

        //public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
        //    WebHost.CreateDefaultBuilder(args)
        //        .UseStartup<Startup>();
        public static IWebHost BuildWebHost(string[] args) => WebHost.CreateDefaultBuilder(args)
            .ConfigureAppConfiguration((hostingContext, builder) =>
             {
                builder
                .SetBasePath(hostingContext.HostingEnvironment.ContentRootPath)
                .AddJsonFile("Ocelot.json");
             })
             .UseStartup<Startup>()
             .Build();
    }
}

效果

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• http://localhost:8088

• http://localhost:53743/jsmer