目录与前言

目录链接：.net core Ocelot 简单网关集群熔断架构整合目录

基于上一篇文章展开 Ocelot 与 Consul 进行合并

创建一个Ocelot网关项目

1. 创建项目 AiDaSi.OcDemo.GateWay 项目结构如下图所示

2. 双击项目名修改如下

<Project Sdk="Microsoft.NET.Sdk.Web">

  <PropertyGroup>
    <TargetFramework>netcoreapp3.1</TargetFramework>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Ocelot" Version="14.0.11" />
    <PackageReference Include="Ocelot.Provider.Consul" Version="14.0.11" />
    <PackageReference Include="Ocelot.Provider.Polly" Version="14.0.11" />
  </ItemGroup>

</Project>

3. 修改 Startup.cs 如下

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    public void ConfigureServices(IServiceCollection services)
    {
        //services.AddControllers();
        services.AddOcelot()
            //使用 counsulconfiguration.json 并添加 Ocelot.Provider.Consul 包
            .AddConsul()
            //使用 counsulpollyconfiguration.json 并添加 Ocelot.Provider.Polly 包
            .AddPolly()
            ;

    }
    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        app.UseOcelot();

    }

4. 创建 configuration.json 

注意所有 json 都需要设置属性

然后先来 康康 负载均衡的配置

{
  "ReRoutes": [
    {
      "DownstreamPathTemplate": "/api/{everything}",
      "DownstreamScheme": "http",
      "DownstreamHostAndPorts": [
        {
          "Host": "localhost",
          "Port": 5726
        },
        {
          "Host": "localhost",
          "Port": 5727
        },
        {
          "Host": "localhost",
          "Port": 5728
        }
      ],
      "UpstreamPathTemplate": "/{everything}",
      "UpstreamHttpMethod": [ "Get", "Post" ],
      "LoadBalancerOptions": {
        "Type": "RoundRobin"
      }
    }
  ],
  "GlobalConfiguration": {

  }
}

5. 修改 Program.cs

public class Program
{
    public static void Main(string[] args)
    {
        CreateHostBuilder(args).Build().Run();
    }

    public static IHostBuilder CreateHostBuilder(string[] args) =>
        Host.CreateDefaultBuilder(args)
            .ConfigureAppConfiguration((hostingContext, config) =>
            {
                config
                    .SetBasePath(hostingContext.HostingEnvironment.ContentRootPath)
                    .AddJsonFile("configuration.json", false, true)
                    .AddEnvironmentVariables();
            })
            .ConfigureWebHostDefaults(webBuilder =>
            {
                webBuilder.UseStartup<Startup>();
            });
}

6. 运行 康康

多节点网关分配

1. 创建的 manyconfiguration.json 配置如下

{
  "ReRoutes": [
    {
      "UpstreamPathTemplate": "/T5726/{url}",
      "UpstreamHttpMethod": [ "Get", "Post" ],
      "DownstreamPathTemplate": "/api/{url}",
      "DownstreamScheme": "http",
      "DownstreamHostAndPorts": [
        {
          "Host": "localhost",
          "Port": 5726
        }
      ]
    },
    {
      "UpstreamPathTemplate": "/T5727/{url}",
      "UpstreamHttpMethod": [ "Get", "Post" ],
      "DownstreamPathTemplate": "/api/{url}",
      "DownstreamScheme": "http",
      "DownstreamHostAndPorts": [
        {
          "Host": "localhost",
          "Port": 5727
        }
      ]
    }
  ],
  "GlobalConfiguration": {

  }
}

2.修改 Program.cs

.AddJsonFile("manyconfiguration.json", false, true)

3. 运行结果

好了回归主题！

Ocelot与Consul结合服务进行配置

counsulconfiguration.json

{
  "ReRoutes": [
    {
      "UpstreamPathTemplate": "/consul/{url}",
      "UpstreamHttpMethod": [ "Get", "Post" ],
      "DownstreamPathTemplate": "/api/{url}",
      "DownstreamScheme": "http",
      "ServiceName": "AiDaSiService",
      "LoadBalancerOptions": {
        "Type": "RoundRobin"
      },
      "UseServiceDiscovery": true
    }
  ],
  "GlobalConfiguration": {
    "BaseUrl": "http://127.0.0.1:6299",
    "ServiceDiscoveryProvider": {
      "Host": "localhost",
      "Port": 8500,
      "Type": "Consul"
    }
  }
}

过程我都不说了

直接运行

心细的你相信已经看到了，访问的是 node 节点的 hostname

这里是通过 Consul 服务节点进行的访问

接下来我们继续！！！

Ocelot与Consul 熔断与限流配置

counsulpollyconfiguration.json

{
  "ReRoutes": [
    {
      "UpstreamPathTemplate": "/consul/{url}",
      "UpstreamHttpMethod": [ "Get", "Post" ],
      "DownstreamPathTemplate": "/api/{url}",
      "DownstreamScheme": "http",
      "ServiceName": "AiDaSiService",
      "LoadBalancerOptions": {
        "Type": "RoundRobin"
      },
      "UseServiceDiscovery": true,
      //"RateLimitOptions": {
      //  "ClientWhitelist": [], //白名单
      //  "EnableRateLimiting": true,
      //  "Period": "5m",     // 1s,5m,1h,1d
      //  "PeriodTimespan": 5,//多少秒之后客户端可以重试
      //  "Limit": 5          //统计时间段内允许的最大请求数量
      //},
      //缓存
      "FileCacheOptions": {
        "TtlSeconds": 10
      }
      //"QoSOptions": {
      //  "ExceptionsAllowedBeforeBreaking": 3, //允许多少个异常请求
      //  "DurationOfBreak": 10000, // 熔断的时间,单位为ms
      //  "TimeoutValue": 10000 // 如果下游请求的处理时间超过多少则自如将请求设置为超时 默认90秒
      //}
    }
  ],
  "GlobalConfiguration": {
    "BaseUrl": "http://127.0.0.1:6299",
    "ServiceDiscoveryProvider": {
      "Host": "localhost",
      "Port": 8500,
      "Type": "Consul"
    },
    "RateLimitOptions": {
      "QuotaExceededMessage": "Too many requests,maybe later?11", // 当请求过载被截断时返回的消息
      "HttpStatusCode": 666 // 当请求过载被截断时返回的http status
    }
  }
}

这里我们缓存了 10s 我们一起来看看是怎么缓存的

感谢各位老铁的观看！！完结！！！撒花！！！

更多参考文献：

Jesse大佬的:

 https://www.cnblogs.com/jesse2013/p/net-core-apigateway-ocelot-docs.html

http://www.jessetalk.cn/2018/03/19/net-core-apigateway-ocelot-docs/