Ocelot 使用

官方文档：http://ocelot.readthedocs.io/en/latest/introduction/gettingstarted.html

新建两个Asp.net core API项目

API1使用5001端口

API2使用5002端口，为了有所区别，改下返回数据

// GET api/values
        [HttpGet]
        public IEnumerable<string> Get()
        {
            return new string[] { "value1", "value2","value3" };
        }

新建asp.net core 空项目APIGate

修改Program

public static IWebHost BuildWebHost(string[] args) =>
            WebHost.CreateDefaultBuilder(args)
                .UseKestrel()
                .UseContentRoot(Directory.GetCurrentDirectory())
                .ConfigureAppConfiguration((hostingContext, config) =>
                {
                    config
                        .SetBasePath(hostingContext.HostingEnvironment.ContentRootPath)
                        .AddJsonFile("appsettings.json", true, true)
                        .AddJsonFile($"appsettings.{hostingContext.HostingEnvironment.EnvironmentName}.json", true, true)
                        .AddJsonFile("configuration.json")
                        .AddEnvironmentVariables();
                })
                .UseStartup<Startup>()
                .Build();

修改Startup

public void ConfigureServices(IServiceCollection services)
        {
            services.AddOcelot();
        }

        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }

            app.UseOcelot().Wait();
        }

添加configuration.json

{
  "ReRoutes": [
    {
      "DownstreamPathTemplate": "/api/values",
      "DownstreamScheme": "http",
      "UpstreamPathTemplate": "/api/values",
      "UpstreamHttpMethod": [ "Get" ],
      "DownstreamHostAndPorts": [
        {
          "Host": "localhost",

        }
      ]
    },
    {
      "DownstreamPathTemplate": "/api/values",
      "DownstreamScheme": "http",
      "UpstreamPathTemplate": "/api/values2",
      "UpstreamHttpMethod": [ "Get" ],
      "DownstreamHostAndPorts": [
        {
          "Host": "localhost",

        }
      ]
    }
  ],
  "GlobalConfiguration": {
  }
}

打开浏览器http://localhost:56235/api/values

打开http://localhost:56235/api/values2

结合Butterfly实现微服务跟踪

下载Butterfly：https://github.com/ButterflyAPM/butterfly/releases

解压后执行

dotnet Butterfly.Web.dll --EnableHttpCollector=true

这里要主要加上后面的参数，否则是监控不到Http的请求的

接下来在API网关和API服务处添加Butterfly包

Install-Package Butterfly.Client.AspNetCore

在API网关Startup中添加服务

public void ConfigureServices(IServiceCollection services)
{
   //your other code
  services.AddButterfly(option =>
  {
      option.CollectorUrl = "http://localhost:9618";
      option.Service = "my service";
  });
}

在API服务中添加代码同上，只是服务名不同

修改configuration.json，开启tracing

{
  "ReRoutes": [
    {
      "DownstreamPathTemplate": "/api/values",
      "DownstreamScheme": "http",
      "UpstreamPathTemplate": "/api/values",
      "UpstreamHttpMethod": [ "Get" ],
      "DownstreamHostAndPorts": [
        {
          "Host": "localhost",

        }
      ],
      "HttpHandlerOptions": {
        "UseTracing": true
      }
    },
    {
      "DownstreamPathTemplate": "/api/values",
      "DownstreamScheme": "http",
      "UpstreamPathTemplate": "/api/values2",
      "UpstreamHttpMethod": [ "Get" ],
      "DownstreamHostAndPorts": [
        {
          "Host": "localhost",

        }
      ],
      "HttpHandlerOptions": {
        "UseTracing": true
      }
    }
  ],
  "GlobalConfiguration": {
  }
}

按上文请求http://localhost:56235/api/values2，然后打开http://localhost:9618/tracing/traces

可以看到已经跟踪到了请求

点击进去可以看到服务的调用

接下来按https://github.com/ButterflyAPM/butterfly-csharp 开启5001和5002，然后访问http://localhost:56235/api/values