feat(aspnetcore): unified Serilog logging via AddSquidStdSerilog

docs/tutorials/aspnetcore-app.md

@@ -34,6 +34,21 @@ Build the app, expose the health checks with the standard `MapHealthChecks`, add
 
 [!code-csharp[](../../samples/SquidStd.Samples.AspNetCore/Program.cs#step-3)]
 
+## Unified Serilog logging
+
+Add `AddSquidStdSerilog()` to send ASP.NET Core framework logs (Kestrel, `Microsoft.Hosting.Lifetime`)
+through the same Serilog logger SquidStd configures from `squidstd.yaml`, giving a single format and a
+single configuration source:
+
+```csharp
+builder.UseSquidStd(options => options.ConfigName = "squidstd");
+builder.AddSquidStdSerilog();
+builder.AddSquidStdHealthChecks();
+```
+
+Without this call the two loggers stay separate (two console formats). With it, `squidstd.yaml` drives
+all logging.
+
 ## Run it
 
 ```bash

src/SquidStd.AspNetCore/Extensions/SquidStdSerilogExtensions.cs

@@ -0,0 +1,41 @@
+using DryIoc;
+using Microsoft.AspNetCore.Builder;
+using Serilog;
+using SquidStd.Core.Interfaces.Bootstrap;
+
+namespace SquidStd.AspNetCore.Extensions;
+
+/// <summary>
+/// Extension methods that route ASP.NET Core and SquidStd logging through a single Serilog pipeline.
+/// </summary>
+public static class SquidStdSerilogExtensions
+{
+    /// <param name="builder">ASP.NET Core application builder.</param>
+    extension(WebApplicationBuilder builder)
+    {
+        /// <summary>
+        /// Configures SquidStd's Serilog logger eagerly (from the SquidStd YAML configuration) and routes
+        /// ASP.NET Core framework logging through it, so framework and SquidStd logs share one config and
+        /// one format. Must be called after <c>UseSquidStd</c> and before <c>Build</c>.
+        /// </summary>
+        /// <returns>The same builder for chaining.</returns>
+        public WebApplicationBuilder AddSquidStdSerilog()
+        {
+            ArgumentNullException.ThrowIfNull(builder);
+
+            if (!builder.Host.Properties.TryGetValue(
+                    SquidStdAspNetCoreBuilderExtensions.ContainerPropertyKey,
+                    out var value) || value is not IContainer container)
+            {
+                throw new InvalidOperationException("AddSquidStdSerilog must be called after UseSquidStd.");
+            }
+
+            var bootstrap = container.Resolve<ISquidStdBootstrap>();
+            bootstrap.ConfigureLogging();
+
+            builder.Host.UseSerilog(Log.Logger, dispose: false);
+
+            return builder;
+        }
+    }
+}

src/SquidStd.AspNetCore/README.md

@@ -51,6 +51,30 @@ Each registered `IHealthCheck` appears as its own entry in the report. Check nam
 | `SquidStdHostedService`               | Hosted service bridging SquidStd service lifecycle to the host.        |
 | `SquidStdHealthChecksExtensions`      | `AddSquidStdHealthChecks(...)` — bridge to ASP.NET Core health checks. |
 
+## Unified logging (opt-in)
+
+By default the SquidStd Serilog logger (configured from the `logger` section of `squidstd.yaml`) and the
+ASP.NET Core framework logger run as two separate pipelines, producing two console formats. Call
+`AddSquidStdSerilog()` after `UseSquidStd()` to route framework logging through SquidStd's Serilog logger,
+so everything shares one configuration and one format:
+
+```csharp
+builder.UseSquidStd(options => options.ConfigName = "squidstd");
+builder.AddSquidStdSerilog();
+```
+
+The logger is driven entirely by `squidstd.yaml` (keys are PascalCase and case-sensitive):
+
+```yaml
+logger:
+  MinimumLevel: Information   # None disables all logging, framework included
+  EnableConsole: true
+  EnableFile: false
+  LogDirectory: logs
+  FileName: squidstd-.log
+  RollingInterval: Day
+```
+
 ## Related
 
 - Tutorial: [Build an ASP.NET Core app](https://tgiachi.github.io/squid-std/tutorials/aspnetcore-app.html)

src/SquidStd.AspNetCore/SquidStd.AspNetCore.csproj

@@ -13,6 +13,7 @@
 
     <ItemGroup>
         <PackageReference Include="DryIoc.Microsoft.DependencyInjection" Version="6.2.0"/>
+        <PackageReference Include="Serilog.Extensions.Hosting" Version="10.0.0"/>
     </ItemGroup>
 
     <ItemGroup>

src/SquidStd.Core/Interfaces/Bootstrap/ISquidStdBootstrap.cs

@@ -39,6 +39,12 @@ public interface ISquidStdBootstrap : IAsyncDisposable
     /// <returns>The resolved service instance.</returns>
     TService Resolve<TService>();
 
+    /// <summary>
+    /// Loads configuration and configures the Serilog logger immediately, if not already configured.
+    /// Idempotent: subsequent calls are no-ops. Lets ASP.NET hosts wire Serilog before the host starts.
+    /// </summary>
+    void ConfigureLogging();
+
     /// <summary>
     /// Starts services, waits until cancellation, and then stops services.
     /// </summary>

src/SquidStd.Services.Core/Services/Bootstrap/SquidStdBootstrap.cs

@@ -120,6 +120,20 @@ public TService Resolve<TService>()
         return Container.Resolve<TService>();
     }
 
+    /// <inheritdoc />
+    public void ConfigureLogging()
+    {
+        ThrowIfDisposed();
+
+        if (_loggerConfigured)
+        {
+            return;
+        }
+
+        Container.Resolve<IConfigManagerService>().Load();
+        ConfigureLogger();
+    }
+
     /// <inheritdoc />
     public async Task RunAsync(CancellationToken cancellationToken = default)
     {
@@ -224,7 +238,7 @@ public static SquidStdBootstrap Create(SquidStdOptions options, IContainer conta
 
     private void ConfigureLogger()
     {
-        if (!Container.IsRegistered<SquidStdLoggerOptions>())
+        if (_loggerConfigured || !Container.IsRegistered<SquidStdLoggerOptions>())
         {
             return;
         }

tests/SquidStd.Tests/AspNetCore/FakeSquidStdBootstrap.cs

@@ -10,6 +10,8 @@ internal sealed class FakeSquidStdBootstrap : ISquidStdBootstrap
 
     public int StopCount { get; private set; }
 
+    public int ConfigureLoggingCount { get; private set; }
+
     public SquidStdOptions Options { get; } = new();
 
     public IContainer Container { get; } = new Container();
@@ -37,6 +39,9 @@ public ValueTask DisposeAsync()
     public TService Resolve<TService>()
         => Container.Resolve<TService>();
 
+    public void ConfigureLogging()
+        => ConfigureLoggingCount++;
+
     public async Task RunAsync(CancellationToken cancellationToken = default)
         => await StartAsync(cancellationToken);
 

tests/SquidStd.Tests/AspNetCore/SquidStdSerilogExtensionsTests.cs

@@ -0,0 +1,114 @@
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.TestHost;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+using Serilog.Extensions.Logging;
+using SquidStd.AspNetCore.Extensions;
+using SquidStd.Tests.Support;
+using SerilogLog = Serilog.Log;
+
+namespace SquidStd.Tests.AspNetCore;
+
+[Collection(SerilogEventSinkCollection.Name)]
+public class SquidStdSerilogExtensionsTests
+{
+    [Fact]
+    public async Task AddSquidStdSerilog_RoutesFrameworkLoggingThroughSerilog()
+    {
+        using var temp = new TempDirectory();
+        var builder = CreateBuilder(temp.Path);
+        builder.UseSquidStd(options => options.ConfigName = "app");
+        builder.AddSquidStdSerilog();
+
+        await using var app = builder.Build();
+
+        var factory = app.Services.GetRequiredService<ILoggerFactory>();
+        Assert.IsType<SerilogLoggerFactory>(factory);
+    }
+
+    [Fact]
+    public async Task UseSquidStd_WithoutAddSquidStdSerilog_KeepsDefaultLoggerFactory()
+    {
+        using var temp = new TempDirectory();
+        var builder = CreateBuilder(temp.Path);
+        builder.UseSquidStd(options => options.ConfigName = "app");
+
+        await using var app = builder.Build();
+
+        var factory = app.Services.GetRequiredService<ILoggerFactory>();
+        Assert.IsNotType<SerilogLoggerFactory>(factory);
+    }
+
+    [Fact]
+    public void AddSquidStdSerilog_WithoutUseSquidStd_Throws()
+    {
+        using var temp = new TempDirectory();
+        var builder = CreateBuilder(temp.Path);
+
+        var ex = Assert.Throws<InvalidOperationException>(() => builder.AddSquidStdSerilog());
+        Assert.Equal("AddSquidStdSerilog must be called after UseSquidStd.", ex.Message);
+    }
+
+    [Fact]
+    public async Task AddSquidStdSerilog_RoutesFrameworkLogsToSquidStdFileSink()
+    {
+        using var temp = new TempDirectory();
+        var logDir = Path.Combine(temp.Path, "logs");
+        File.WriteAllText(
+            Path.Combine(temp.Path, "app.yaml"),
+            "logger:\n  MinimumLevel: Information\n  EnableConsole: false\n  EnableFile: true\n  LogDirectory: logs\n  FileName: app-.log\n  RollingInterval: Day\n");
+
+        const string marker = "framework-log-marker-a1b2c3";
+
+        var builder = CreateBuilder(temp.Path);
+        builder.UseSquidStd(options => options.ConfigName = "app");
+        builder.AddSquidStdSerilog();
+
+        await using (var app = builder.Build())
+        {
+            await app.StartAsync();
+            var logger = app.Services.GetRequiredService<ILogger<SquidStdSerilogExtensionsTests>>();
+#pragma warning disable CA1848, CA1873 // LoggerMessage delegates are overkill for a one-shot test log.
+            logger.LogInformation("emitting {Marker}", marker);
+#pragma warning restore CA1848, CA1873
+            await app.StopAsync();
+        }
+
+        await SerilogLog.CloseAndFlushAsync();
+
+        var logFile = Directory.EnumerateFiles(logDir, "app-*.log").First();
+        var contents = await File.ReadAllTextAsync(logFile);
+        Assert.Contains(marker, contents, StringComparison.Ordinal);
+    }
+
+    [Fact]
+    public async Task AddSquidStdSerilog_CalledTwice_DoesNotThrow()
+    {
+        using var temp = new TempDirectory();
+        var builder = CreateBuilder(temp.Path);
+        builder.UseSquidStd(options => options.ConfigName = "app");
+
+        builder.AddSquidStdSerilog();
+        builder.AddSquidStdSerilog();
+
+        await using var app = builder.Build();
+        var factory = app.Services.GetRequiredService<ILoggerFactory>();
+        Assert.IsType<SerilogLoggerFactory>(factory);
+    }
+
+    private static WebApplicationBuilder CreateBuilder(string contentRootPath)
+    {
+        var builder = WebApplication.CreateBuilder(
+            new WebApplicationOptions
+            {
+                ContentRootPath = contentRootPath,
+                EnvironmentName = Environments.Development
+            }
+        );
+
+        builder.WebHost.UseTestServer();
+
+        return builder;
+    }
+}

tests/SquidStd.Tests/Bootstrap/SquidStdBootstrapLoggingTests.cs

@@ -0,0 +1,62 @@
+using DryIoc;
+using SquidStd.Core.Data.Bootstrap;
+using SquidStd.Services.Core.Services.Bootstrap;
+using SquidStd.Tests.Support;
+using SerilogILogger = Serilog.ILogger;
+
+namespace SquidStd.Tests.Bootstrap;
+
+[Collection(SerilogEventSinkCollection.Name)]
+public class SquidStdBootstrapLoggingTests
+{
+    [Fact]
+    public async Task ConfigureLogging_LoadsConfigurationAndRegistersLoggerEagerly()
+    {
+        using var temp = new TempDirectory();
+        await using var bootstrap =
+            SquidStdBootstrap.Create(new() { ConfigName = "app", RootDirectory = temp.Path });
+
+        bootstrap.ConfigureLogging();
+
+        Assert.NotNull(bootstrap.Container.Resolve<SquidStdLoggerOptions>());
+        Assert.NotNull(bootstrap.Container.Resolve<SerilogILogger>());
+    }
+
+    [Fact]
+    public async Task ConfigureLogging_CalledTwice_ConfiguresLoggerOnce()
+    {
+        using var temp = new TempDirectory();
+        await using var bootstrap =
+            SquidStdBootstrap.Create(new() { ConfigName = "app", RootDirectory = temp.Path });
+
+        bootstrap.ConfigureLogging();
+        var first = bootstrap.Container.Resolve<SerilogILogger>();
+
+        bootstrap.ConfigureLogging();
+        var second = bootstrap.Container.Resolve<SerilogILogger>();
+
+        Assert.Same(first, second);
+    }
+
+    [Fact]
+    public async Task ConfigureLogging_ThenStartAsync_DoesNotRebuildLogger()
+    {
+        using var temp = new TempDirectory();
+        await using var bootstrap =
+            SquidStdBootstrap.Create(new() { ConfigName = "app", RootDirectory = temp.Path });
+
+        bootstrap.ConfigureLogging();
+        var eager = bootstrap.Container.Resolve<SerilogILogger>();
+
+        await bootstrap.StartAsync();
+        try
+        {
+            var afterStart = bootstrap.Container.Resolve<SerilogILogger>();
+            Assert.Same(eager, afterStart);
+        }
+        finally
+        {
+            await bootstrap.StopAsync();
+        }
+    }
+}