kubernetes provider (#772)

* feat: Kubernetes ServiceDiscoveryProvider

* 编写k8s测试例子

* feat：fix kube config

* feat： remove port

* feat ： complete the k8s test

* feat :  add kubeserviceDiscovery test

* feat : add kube provider unittest

* feat :add kubetnetes docs

how to use ocelot with kubetnetes docs

* keep the configuration as simple as possible, no qos, no cache

* fix: use http

* add PollingKubeServiceDiscovery

* feat : refactor logger

* feat : add  pollkube docs

* feat：Remove unnecessary code

* feat ： code-block json

samples/OelotKube/DownstreamService/Controllers/ValuesController.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading.Tasks;
+using Microsoft.AspNetCore.Mvc;
+
+namespace DownstreamService.Controllers
+{
+    [Route("api/[controller]")]
+    [ApiController]
+    public class ValuesController : ControllerBase
+    {
+        // GET api/values
+        [HttpGet]
+        public ActionResult<IEnumerable<string>> Get()
+        {
+            return new string[] { "value1", "value2" };
+        }
+
+        // GET api/values/5
+        [HttpGet("{id}")]
+        public ActionResult<string> Get(int id)
+        {
+            return "value";
+        }
+
+        // POST api/values
+        [HttpPost]
+        public void Post([FromBody] string value)
+        {
+        }
+
+        // PUT api/values/5
+        [HttpPut("{id}")]
+        public void Put(int id, [FromBody] string value)
+        {
+        }
+
+        // DELETE api/values/5
+        [HttpDelete("{id}")]
+        public void Delete(int id)
+        {
+        }
+    }
+}

samples/OelotKube/DownstreamService/Dockerfile

@@ -0,0 +1,19 @@
+FROM microsoft/dotnet:2.1-aspnetcore-runtime AS base
+WORKDIR /app
+EXPOSE 80
+
+FROM microsoft/dotnet:2.1-sdk AS build
+WORKDIR /src
+COPY ["DownstreamService/DownstreamService.csproj", "DownstreamService/"]
+RUN dotnet restore "DownstreamService/DownstreamService.csproj"
+COPY . .
+WORKDIR "/src/DownstreamService"
+RUN dotnet build "DownstreamService.csproj" -c Release -o /app
+
+FROM build AS publish
+RUN dotnet publish "DownstreamService.csproj" -c Release -o /app
+
+FROM base AS final
+WORKDIR /app
+COPY --from=publish /app .
+ENTRYPOINT ["dotnet", "DownstreamService.dll"]

samples/OelotKube/DownstreamService/Dockerfile.develop

@@ -0,0 +1,15 @@
+FROM microsoft/dotnet:2.1-sdk
+ARG BUILD_CONFIGURATION=Debug
+ENV ASPNETCORE_ENVIRONMENT=Development
+ENV DOTNET_USE_POLLING_FILE_WATCHER=true
+EXPOSE 80
+
+WORKDIR /src
+COPY ["DownstreamService/DownstreamService.csproj", "DownstreamService/"]
+
+RUN dotnet restore "DownstreamService/DownstreamService.csproj"
+COPY . .
+WORKDIR "/src/DownstreamService"
+RUN dotnet build --no-restore "DownstreamService.csproj" -c $BUILD_CONFIGURATION
+
+ENTRYPOINT ["dotnet", "run", "--no-build", "--no-launch-profile", "-c", "$BUILD_CONFIGURATION", "--"]

samples/OelotKube/DownstreamService/DownstreamService.csproj

@@ -0,0 +1,15 @@
+<Project Sdk="Microsoft.NET.Sdk.Web">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <AspNetCoreHostingModel>InProcess</AspNetCoreHostingModel>
+    <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.AspNetCore.App" />
+    <PackageReference Include="Microsoft.AspNetCore.Razor.Design" Version="2.1.2" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.1.1" />
+  </ItemGroup>
+
+</Project>

samples/OelotKube/DownstreamService/Program.cs

@@ -0,0 +1,24 @@
+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 DownstreamService
+{
+    public class Program
+    {
+        public static void Main(string[] args)
+        {
+            CreateWebHostBuilder(args).Build().Run();
+        }
+
+        public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
+            WebHost.CreateDefaultBuilder(args)
+                .UseStartup<Startup>();
+    }
+}

samples/OelotKube/DownstreamService/Properties/launchSettings.json

@@ -0,0 +1,35 @@
+{
+  "iisSettings": {
+    "windowsAuthentication": false,
+    "anonymousAuthentication": true,
+    "iisExpress": {
+      "applicationUrl": "http://localhost:56411",
+      "sslPort": 0
+    }
+  },
+  "$schema": "http://json.schemastore.org/launchsettings.json",
+  "profiles": {
+    "IIS Express": {
+      "commandName": "IISExpress",
+      "launchBrowser": true,
+      "launchUrl": "api/values",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      }
+    },
+    "DownstreamService": {
+      "commandName": "Project",
+      "launchBrowser": true,
+      "launchUrl": "api/values",
+      "environmentVariables": {
+        "ASPNETCORE_ENVIRONMENT": "Development"
+      },
+      "applicationUrl": "http://localhost:5000"
+    },
+    "Docker": {
+      "commandName": "Docker",
+      "launchBrowser": true,
+      "launchUrl": "{Scheme}://{ServiceHost}:{ServicePort}/api/values"
+    }
+  }
+}

samples/OelotKube/DownstreamService/Startup.cs

@@ -0,0 +1,41 @@
+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;
+
+namespace DownstreamService
+{
+    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)
+        {
+            services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
+        }
+
+        // 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();
+        }
+    }
+}

samples/OelotKube/DownstreamService/appsettings.Development.json

@@ -0,0 +1,9 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Debug",
+      "System": "Information",
+      "Microsoft": "Information"
+    }
+  }
+}

samples/OelotKube/DownstreamService/appsettings.json

@@ -0,0 +1,8 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}