.NET Core service worker DI example (#951)

* Added example source code

* Fix namespace name

* Added example source code

* Fix namespace name

* Fix sln file

* Update Program.cs

* Updated IKubernetes DI registration

examples/webApiDependencyInjection/Program.cs

@@ -6,7 +6,7 @@ var builder = WebApplication.CreateBuilder(args);
 var kubernetesClientConfig = KubernetesClientConfiguration.BuildDefaultConfig();
 
 // Register Kubernetes client interface as sigleton
-builder.Services.AddSingleton<IKubernetes>(new Kubernetes(kubernetesClientConfig));
+builder.Services.AddSingleton<IKubernetes>(_ => new Kubernetes(kubernetesClientConfig));
 
 // Add services to the container.
 builder.Services.AddEndpointsApiExplorer();

examples/workerServiceDependencyInjection/Program.cs

@@ -0,0 +1,17 @@
+using k8s;
+using workerServiceDependencyInjection;
+
+IHost host = Host.CreateDefaultBuilder(args)
+    .ConfigureServices(services =>
+    {
+        // Load kubernetes configuration
+        var kubernetesClientConfig = KubernetesClientConfiguration.BuildDefaultConfig();
+
+        // Register Kubernetes client interface as sigleton
+        services.AddSingleton<IKubernetes>(_ => new Kubernetes(kubernetesClientConfig));
+
+        services.AddHostedService<Worker>();
+    })
+    .Build();
+
+await host.RunAsync();

examples/workerServiceDependencyInjection/Worker.cs

@@ -0,0 +1,40 @@
+using k8s;
+
+namespace workerServiceDependencyInjection
+{
+    public class Worker : BackgroundService
+    {
+        private readonly ILogger<Worker> logger;
+        private readonly IKubernetes kubernetesClient;
+
+        /// <summary>
+        /// Inject in the constructor the IKubernetes interface.
+        /// </summary>
+        /// <param name="logger"></param>
+        /// <param name="kubernetesClient"></param>
+        public Worker(ILogger<Worker> logger, IKubernetes kubernetesClient)
+        {
+            this.logger = logger;
+            this.kubernetesClient = kubernetesClient;
+        }
+
+        protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+        {
+            while (!stoppingToken.IsCancellationRequested)
+            {
+                logger.LogInformation("Worker running at: {time}", DateTimeOffset.Now);
+
+                // Read the list of pods contained in default namespace
+                var podList = kubernetesClient.CoreV1.ListNamespacedPod("default");
+
+                // Print pods names
+                foreach (var pod in podList.Items)
+                {
+                    Console.WriteLine(pod.Metadata.Name);
+                }
+
+                await Task.Delay(1000, stoppingToken);
+            }
+        }
+    }
+}

examples/workerServiceDependencyInjection/appsettings.Development.json

@@ -0,0 +1,8 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.Hosting.Lifetime": "Information"
+    }
+  }
+}

examples/workerServiceDependencyInjection/appsettings.json

@@ -0,0 +1,8 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.Hosting.Lifetime": "Information"
+    }
+  }
+}

examples/workerServiceDependencyInjection/workerServiceDependencyInjection.csproj

@@ -0,0 +1,11 @@
+<Project Sdk="Microsoft.NET.Sdk.Worker">
+
+  <PropertyGroup>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Hosting" Version="6.0.1" />
+  </ItemGroup>
+</Project>

kubernetes-client.sln

@@ -67,7 +67,9 @@ Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Kubectl.Tests", "tests\Kube
 EndProject
 Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "openTelemetryConsole", "examples\openTelemetryConsole\openTelemetryConsole.csproj", "{8E266190-AE6E-44A8-948D-BD974AA82428}"
 EndProject
-Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "webApiDependencyInjection", "examples\webApiDependencyInjection\webApiDependencyInjection.csproj", "{C0759F88-A010-4DEF-BD3B-E183D3328FFC}"
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "webApiDependencyInjection", "examples\webApiDependencyInjection\webApiDependencyInjection.csproj", "{C0759F88-A010-4DEF-BD3B-E183D3328FFC}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "workerServiceDependencyInjection", "examples\workerServiceDependencyInjection\workerServiceDependencyInjection.csproj", "{05DC8884-AC54-4603-AC25-AE9D9F24E7AE}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -439,6 +441,18 @@ Global
 		{C0759F88-A010-4DEF-BD3B-E183D3328FFC}.Release|x64.Build.0 = Release|Any CPU
 		{C0759F88-A010-4DEF-BD3B-E183D3328FFC}.Release|x86.ActiveCfg = Release|Any CPU
 		{C0759F88-A010-4DEF-BD3B-E183D3328FFC}.Release|x86.Build.0 = Release|Any CPU
+		{05DC8884-AC54-4603-AC25-AE9D9F24E7AE}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{05DC8884-AC54-4603-AC25-AE9D9F24E7AE}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{05DC8884-AC54-4603-AC25-AE9D9F24E7AE}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{05DC8884-AC54-4603-AC25-AE9D9F24E7AE}.Debug|x64.Build.0 = Debug|Any CPU
+		{05DC8884-AC54-4603-AC25-AE9D9F24E7AE}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{05DC8884-AC54-4603-AC25-AE9D9F24E7AE}.Debug|x86.Build.0 = Debug|Any CPU
+		{05DC8884-AC54-4603-AC25-AE9D9F24E7AE}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{05DC8884-AC54-4603-AC25-AE9D9F24E7AE}.Release|Any CPU.Build.0 = Release|Any CPU
+		{05DC8884-AC54-4603-AC25-AE9D9F24E7AE}.Release|x64.ActiveCfg = Release|Any CPU
+		{05DC8884-AC54-4603-AC25-AE9D9F24E7AE}.Release|x64.Build.0 = Release|Any CPU
+		{05DC8884-AC54-4603-AC25-AE9D9F24E7AE}.Release|x86.ActiveCfg = Release|Any CPU
+		{05DC8884-AC54-4603-AC25-AE9D9F24E7AE}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -474,6 +488,7 @@ Global
 		{9128F6DC-6B7A-417F-937A-90461D6989A8} = {8AF4A5C2-F0CE-47D5-A4C5-FE4AB83CA509}
 		{8E266190-AE6E-44A8-948D-BD974AA82428} = {B70AFB57-57C9-46DC-84BE-11B7DDD34B40}
 		{C0759F88-A010-4DEF-BD3B-E183D3328FFC} = {B70AFB57-57C9-46DC-84BE-11B7DDD34B40}
+		{05DC8884-AC54-4603-AC25-AE9D9F24E7AE} = {B70AFB57-57C9-46DC-84BE-11B7DDD34B40}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {049A763A-C891-4E8D-80CF-89DD3E22ADC7}