[Examples.Microservice] migrate to Minimal Hosting Model (#6247)

Author: ysolomchenko

examples/MicroserviceExample/WebApi/Program.cs

@@ -1,19 +1,36 @@
 // Copyright The OpenTelemetry Authors
 // SPDX-License-Identifier: Apache-2.0
 
-namespace WebApi;
+using OpenTelemetry.Trace;
+using Utils.Messaging;
 
-internal static class Program
+var builder = WebApplication.CreateBuilder(args);
+
+builder.Services.AddControllers();
+
+builder.Services.AddSingleton<MessageSender>();
+
+builder.Services.AddOpenTelemetry()
+    .WithTracing(b => b
+        .AddAspNetCoreInstrumentation()
+        .AddSource(nameof(MessageSender))
+        .AddZipkinExporter(o =>
+        {
+            var zipkinHostName = Environment.GetEnvironmentVariable("ZIPKIN_HOSTNAME") ?? "localhost";
+            o.Endpoint = new Uri($"http://{zipkinHostName}:9411/api/v2/spans");
+        }));
+
+builder.WebHost.UseUrls("http://*:5000");
+
+var app = builder.Build();
+
+if (app.Environment.IsDevelopment())
 {
-    public static void Main(string[] args)
-    {
-        CreateHostBuilder(args).Build().Run();
-    }
-
-    public static IHostBuilder CreateHostBuilder(string[] args) =>
-        Host.CreateDefaultBuilder(args)
-            .ConfigureWebHostDefaults(webBuilder =>
-            {
-                webBuilder.UseUrls("http://*:5000").UseStartup<Startup>();
-            });
+    app.UseDeveloperExceptionPage();
 }
+
+app.UseRouting();
+
+app.MapControllers();
+
+app.Run();

examples/MicroserviceExample/WebApi/Startup.cs

@@ -3,31 +3,22 @@
 
 using OpenTelemetry.Trace;
 using Utils.Messaging;
+using WorkerService;
 
-namespace WorkerService;
+var builder = Host.CreateApplicationBuilder(args);
 
-internal static class Program
-{
-    public static void Main(string[] args)
-    {
-        CreateHostBuilder(args).Build().Run();
-    }
+builder.Services.AddHostedService<Worker>();
+builder.Services.AddSingleton<MessageReceiver>();
 
-    public static IHostBuilder CreateHostBuilder(string[] args) =>
-        Host.CreateDefaultBuilder(args)
-            .ConfigureServices((hostContext, services) =>
-            {
-                services.AddHostedService<Worker>();
+builder.Services.AddOpenTelemetry()
+    .WithTracing(b => b
+        .AddSource(nameof(MessageReceiver))
+        .AddZipkinExporter(o =>
+        {
+            var zipkinHostName = Environment.GetEnvironmentVariable("ZIPKIN_HOSTNAME") ?? "localhost";
+            o.Endpoint = new Uri($"http://{zipkinHostName}:9411/api/v2/spans");
+        }));
 
-                services.AddSingleton<MessageReceiver>();
+var app = builder.Build();
 
-                services.AddOpenTelemetry()
-                    .WithTracing(builder => builder
-                        .AddSource(nameof(MessageReceiver))
-                        .AddZipkinExporter(b =>
-                        {
-                            var zipkinHostName = Environment.GetEnvironmentVariable("ZIPKIN_HOSTNAME") ?? "localhost";
-                            b.Endpoint = new Uri($"http://{zipkinHostName}:9411/api/v2/spans");
-                        }));
-            });
-}
+app.Run();