Add default configuration and logging to CreateSlimBuilder (#47797)

* Add default configuration and logging to CreateSlimBuilder

 Update slim builder to include:
- JSON file configuration for appsettings.json and appsettings.{EnvironmentName}.json
- UserSecrets configuration
- Console logging
- Logging configuration

Update api template with appsettings files and remove AddConsole

This adds back some app size to the api template app. But it is worth the tradeoff given users expect these things to work out of the box.

Fix #47598

Author: eerhardt

src/DefaultBuilder/src/WebApplicationBuilder.cs

@@ -2,6 +2,7 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 using System.Diagnostics;
+using System.Reflection;
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Hosting;
@@ -111,7 +112,8 @@ internal WebApplicationBuilder(WebApplicationOptions options, bool slim, Action<
         });
 
         // Ensure the same behavior of the non-slim WebApplicationBuilder by adding the default "app" Configuration sources
-        ApplyDefaultAppConfiguration(options, configuration);
+        ApplyDefaultAppConfigurationSlim(_hostApplicationBuilder.Environment, configuration, options.Args);
+        AddDefaultServicesSlim(configuration, _hostApplicationBuilder.Services);
 
         // configure the ServiceProviderOptions here since CreateEmptyApplicationBuilder won't.
         var serviceProviderFactory = GetServiceProviderFactory(_hostApplicationBuilder);
@@ -204,14 +206,66 @@ private static void SetDefaultContentRoot(WebApplicationOptions options, Configu
         }
     }
 
-    private static void ApplyDefaultAppConfiguration(WebApplicationOptions options, ConfigurationManager configuration)
+    private static void ApplyDefaultAppConfigurationSlim(IHostEnvironment env, ConfigurationManager configuration, string[]? args)
     {
+        // Logic taken from https://github.com/dotnet/runtime/blob/6149ca07d2202c2d0d518e10568c0d0dd3473576/src/libraries/Microsoft.Extensions.Hosting/src/HostingHostBuilderExtensions.cs#L229-L256
+
+        var reloadOnChange = GetReloadConfigOnChangeValue(configuration);
+
+        configuration.AddJsonFile("appsettings.json", optional: true, reloadOnChange: reloadOnChange)
+            .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true, reloadOnChange: reloadOnChange);
+
+        if (env.IsDevelopment() && env.ApplicationName is { Length: > 0 })
+        {
+            try
+            {
+                var appAssembly = Assembly.Load(new AssemblyName(env.ApplicationName));
+                configuration.AddUserSecrets(appAssembly, optional: true, reloadOnChange: reloadOnChange);
+            }
+            catch (FileNotFoundException)
+            {
+                // The assembly cannot be found, so just skip it.
+            }
+        }
+
         configuration.AddEnvironmentVariables();
 
-        if (options.Args is { Length: > 0 } args)
+        if (args is { Length: > 0 })
         {
             configuration.AddCommandLine(args);
         }
+
+        static bool GetReloadConfigOnChangeValue(ConfigurationManager configuration)
+        {
+            const string reloadConfigOnChangeKey = "hostBuilder:reloadConfigOnChange";
+            var result = true;
+            if (configuration[reloadConfigOnChangeKey] is string reloadConfigOnChange)
+            {
+                if (!bool.TryParse(reloadConfigOnChange, out result))
+                {
+                    throw new InvalidOperationException($"Failed to convert configuration value at '{configuration.GetSection(reloadConfigOnChangeKey).Path}' to type '{typeof(bool)}'.");
+                }
+            }
+            return result;
+        }
+    }
+
+    private static void AddDefaultServicesSlim(ConfigurationManager configuration, IServiceCollection services)
+    {
+        // Add the necessary services for the slim WebApplicationBuilder, taken from https://github.com/dotnet/runtime/blob/6149ca07d2202c2d0d518e10568c0d0dd3473576/src/libraries/Microsoft.Extensions.Hosting/src/HostingHostBuilderExtensions.cs#L266
+        services.AddLogging(logging =>
+        {
+            logging.AddConfiguration(configuration.GetSection("Logging"));
+            logging.AddSimpleConsole();
+
+            logging.Configure(options =>
+            {
+                options.ActivityTrackingOptions =
+                    ActivityTrackingOptions.SpanId |
+                    ActivityTrackingOptions.TraceId |
+                    ActivityTrackingOptions.ParentId;
+            });
+        });
     }
 
     /// <summary>

src/DefaultBuilder/test/Microsoft.AspNetCore.Tests/WebApplicationTests.cs

@@ -24,13 +24,16 @@
 using Microsoft.AspNetCore.Tests;
 using Microsoft.DotNet.RemoteExecutor;
 using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.Configuration.Json;
+using Microsoft.Extensions.Configuration.UserSecrets;
 using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.DependencyInjection.Extensions;
 using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 
 [assembly: HostingStartup(typeof(WebApplicationTests.TestHostingStartup))]
+[assembly: UserSecretsId("UserSecret-TestId")]
 
 namespace Microsoft.AspNetCore.Tests;
 
@@ -609,6 +612,41 @@ public void ContentRootIsBaseDirectoryWhenCurrentIsSpecialFolderSystem()
         }, options);
     }
 
+    public static IEnumerable<object[]> EnablesAppSettingsConfigurationData
+    {
+        get
+        {
+            yield return new object[] { (CreateBuilderOptionsFunc)CreateBuilderOptions, true };
+            yield return new object[] { (CreateBuilderOptionsFunc)CreateBuilderOptions, false };
+            yield return new object[] { (CreateBuilderOptionsFunc)CreateSlimBuilderOptions, true };
+            yield return new object[] { (CreateBuilderOptionsFunc)CreateSlimBuilderOptions, false };
+        }
+    }
+
+    [Theory]
+    [MemberData(nameof(EnablesAppSettingsConfigurationData))]
+    public void WebApplicationBuilderEnablesAppSettingsConfiguration(CreateBuilderOptionsFunc createBuilder, bool isDevelopment)
+    {
+        var options = new WebApplicationOptions
+        {
+            EnvironmentName = isDevelopment ? Environments.Development : Environments.Production
+        };
+
+        var webApplication = createBuilder(options).Build();
+
+        var config = Assert.IsType<ConfigurationManager>(webApplication.Configuration);
+        Assert.Contains(config.Sources, source => source is JsonConfigurationSource jsonSource && jsonSource.Path == "appsettings.json");
+
+        if (isDevelopment)
+        {
+            Assert.Contains(config.Sources, source => source is JsonConfigurationSource jsonSource && jsonSource.Path == "appsettings.Development.json");
+        }
+        else
+        {
+            Assert.DoesNotContain(config.Sources, source => source is JsonConfigurationSource jsonSource && jsonSource.Path == "appsettings.Development.json");
+        }
+    }
+
     [Theory]
     [MemberData(nameof(CreateBuilderOptionsFuncs))]
     public void WebApplicationBuilderSettingInvalidApplicationDoesNotThrowWhenAssemblyLoadForUserSecretsFail(CreateBuilderOptionsFunc createBuilder)
@@ -626,6 +664,22 @@ public void WebApplicationBuilderSettingInvalidApplicationDoesNotThrowWhenAssemb
         Assert.Equal(Environments.Development, webApplication.Environment.EnvironmentName);
     }
 
+    [Theory]
+    [MemberData(nameof(CreateBuilderOptionsFuncs))]
+    public void WebApplicationBuilderEnablesUserSecretsInDevelopment(CreateBuilderOptionsFunc createBuilder)
+    {
+        var options = new WebApplicationOptions
+        {
+            ApplicationName = typeof(WebApplicationTests).Assembly.GetName().Name,
+            EnvironmentName = Environments.Development
+        };
+
+        var webApplication = createBuilder(options).Build();
+
+        var config = Assert.IsType<ConfigurationManager>(webApplication.Configuration);
+        Assert.Contains(config.Sources, source => source is JsonConfigurationSource jsonSource && jsonSource.Path == "secrets.json");
+    }
+
     [Theory]
     [MemberData(nameof(WebApplicationBuilderConstructorFuncs))]
     public void WebApplicationBuilderCanConfigureHostSettingsUsingWebApplicationOptions(WebApplicationBuilderConstructorFunc createBuilder)
@@ -1470,7 +1524,7 @@ public async Task WebApplication_CanCallUseEndpointsWithoutUseRoutingFails(Creat
     [Fact]
     public void WebApplicationCreate_RegistersEventSourceLogger()
     {
-        var listener = new TestEventListener();
+        using var listener = new TestEventListener();
         var app = WebApplication.Create();
 
         var logger = app.Services.GetRequiredService<ILogger<WebApplicationTests>>();
@@ -1487,7 +1541,7 @@ public void WebApplicationCreate_RegistersEventSourceLogger()
     [MemberData(nameof(CreateBuilderFuncs))]
     public void WebApplicationBuilder_CanClearDefaultLoggers(CreateBuilderFunc createBuilder)
     {
-        var listener = new TestEventListener();
+        using var listener = new TestEventListener();
         var builder = createBuilder();
         builder.Logging.ClearProviders();
 
@@ -1590,50 +1644,22 @@ public async Task CanAddMiddlewareBeforeUseRouting(CreateBuilderFunc createBuild
         Assert.Equal("One", chosenEndpoint);
     }
 
-    public static IEnumerable<object[]> OnlyAddsDefaultServicesOnceData
-    {
-        get
-        {
-            // The slim builder doesn't add logging services by default
-            yield return new object[] { (CreateBuilderFunc)CreateBuilder, true };
-            yield return new object[] { (CreateBuilderFunc)CreateSlimBuilder, false };
-        }
-    }
-
     [Theory]
-    [MemberData(nameof(OnlyAddsDefaultServicesOnceData))]
-    public async Task WebApplicationBuilder_OnlyAddsDefaultServicesOnce(CreateBuilderFunc createBuilder, bool hasLogging)
+    [MemberData(nameof(CreateBuilderFuncs))]
+    public async Task WebApplicationBuilder_OnlyAddsDefaultServicesOnce(CreateBuilderFunc createBuilder)
     {
         var builder = createBuilder();
 
         // IWebHostEnvironment is added by ConfigureDefaults
-        var loggingDescriptors = builder.Services.Where(descriptor => descriptor.ServiceType == typeof(IConfigureOptions<LoggerFactoryOptions>));
-        if (hasLogging)
-        {
-            Assert.Single(loggingDescriptors);
-        }
-        else
-        {
-            Assert.Empty(loggingDescriptors);
-        }
-
+        Assert.Single(builder.Services.Where(descriptor => descriptor.ServiceType == typeof(IConfigureOptions<LoggerFactoryOptions>)));
         // IWebHostEnvironment is added by ConfigureWebHostDefaults
         Assert.Single(builder.Services.Where(descriptor => descriptor.ServiceType == typeof(IWebHostEnvironment)));
         Assert.Single(builder.Services.Where(descriptor => descriptor.ServiceType == typeof(IOptionsChangeTokenSource<HostFilteringOptions>)));
         Assert.Single(builder.Services.Where(descriptor => descriptor.ServiceType == typeof(IServer)));
 
         await using var app = builder.Build();
 
-        var loggingServices = app.Services.GetRequiredService<IEnumerable<IConfigureOptions<LoggerFactoryOptions>>>();
-        if (hasLogging)
-        {
-            Assert.Single(loggingServices);
-        }
-        else
-        {
-            Assert.Empty(loggingServices);
-        }
-
+        Assert.Single(app.Services.GetRequiredService<IEnumerable<IConfigureOptions<LoggerFactoryOptions>>>());
         Assert.Single(app.Services.GetRequiredService<IEnumerable<IWebHostEnvironment>>());
         Assert.Single(app.Services.GetRequiredService<IEnumerable<IOptionsChangeTokenSource<HostFilteringOptions>>>());
         Assert.Single(app.Services.GetRequiredService<IEnumerable<IServer>>());
@@ -1867,7 +1893,7 @@ public async Task PropertiesPreservedFromInnerApplication(CreateBuilderFunc crea
 
     [Theory]
     [MemberData(nameof(CreateBuilderOptionsFuncs))]
-    public async Task DeveloperExceptionPageIsOnByDefaltInDevelopment(CreateBuilderOptionsFunc createBuilder)
+    public async Task DeveloperExceptionPageIsOnByDefaultInDevelopment(CreateBuilderOptionsFunc createBuilder)
     {
         var builder = createBuilder(new WebApplicationOptions() { EnvironmentName = Environments.Development });
         builder.WebHost.UseTestServer();
@@ -2331,7 +2357,7 @@ public async Task SupportsDisablingMiddlewareAutoRegistration(CreateBuilderFunc
 
         app.Properties["__AuthenticationMiddlewareSet"] = true;
 
-        app.MapGet("/hello", (ClaimsPrincipal user) => {}).AllowAnonymous();
+        app.MapGet("/hello", (ClaimsPrincipal user) => { }).AllowAnonymous();
 
         Assert.True(app.Properties.ContainsKey("__AuthenticationMiddlewareSet"));
         Assert.False(app.Properties.ContainsKey("__AuthorizationMiddlewareSet"));

src/ProjectTemplates/Web.ProjectTemplates/content/Api-CSharp/Program.Main.cs

@@ -9,7 +9,6 @@ public class Program
     public static void Main(string[] args)
     {
         var builder = WebApplication.CreateSlimBuilder(args);
-        builder.Logging.AddConsole();
 
         #if (NativeAot)
         builder.Services.ConfigureHttpJsonOptions(options =>

src/ProjectTemplates/Web.ProjectTemplates/content/Api-CSharp/Program.cs

@@ -4,7 +4,6 @@
 using Company.ApiApplication1;
 
 var builder = WebApplication.CreateSlimBuilder(args);
-builder.Logging.AddConsole();
 
 #if (NativeAot)
 builder.Services.ConfigureHttpJsonOptions(options =>

src/ProjectTemplates/Web.ProjectTemplates/content/Api-CSharp/appsettings.Development.json

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

src/ProjectTemplates/Web.ProjectTemplates/content/Api-CSharp/appsettings.json

@@ -0,0 +1,9 @@
+{
+  "Logging": {
+    "LogLevel": {
+      "Default": "Information",
+      "Microsoft.AspNetCore": "Warning"
+    }
+  },
+  "AllowedHosts": "*"
+}

src/ProjectTemplates/test/Templates.Tests/template-baselines.json

@@ -532,6 +532,8 @@
       "Template": "api",
       "Arguments": "new api",
       "Files": [
+        "appsettings.Development.json",
+        "appsettings.json",
         "Todo.cs",
         "Program.cs",
         "{ProjectName}.http",
@@ -543,6 +545,8 @@
       "Template": "api",
       "Arguments": "new api -aot",
       "Files": [
+        "appsettings.Development.json",
+        "appsettings.json",
         "Todo.cs",
         "Program.cs",
         "{ProjectName}.http",
@@ -554,6 +558,8 @@
       "Template": "api",
       "Arguments": "new api --use-program-main",
       "Files": [
+        "appsettings.Development.json",
+        "appsettings.json",
         "Todo.cs",
         "Program.cs",
         "{ProjectName}.http",
@@ -565,6 +571,8 @@
       "Template": "api",
       "Arguments": "new api -aot --use-program-main",
       "Files": [
+        "appsettings.Development.json",
+        "appsettings.json",
         "Todo.cs",
         "Program.cs",
         "{ProjectName}.http",