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Foxnouns.Backend/Extensions/WebApplicationExtensions.cs

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+using Serilog;
+using Serilog.Events;
+using Serilog.Sinks.SystemConsole.Themes;
+
+namespace Foxnouns.Backend.Extensions;
+
+public static class ServiceCollectionExtensions
+{
+    /// <summary>
+    /// Adds Serilog to this service collection. This method also initializes Serilog, so it should be called as early as possible, before any log calls.
+    /// </summary>
+    public static WebApplicationBuilder AddSerilog(this WebApplicationBuilder builder, LogEventLevel level)
+    {
+        var config = builder.Configuration.Get<Config>() ?? new();
+
+        var logCfg = new LoggerConfiguration()
+            .Enrich.FromLogContext()
+            .MinimumLevel.Is(level)
+            // ASP.NET's built in request logs are extremely verbose, so we use Serilog's instead.
+            // Serilog doesn't disable the built-in logs, so we do it here.
+            .MinimumLevel.Override("Microsoft", LogEventLevel.Information)
+            .MinimumLevel.Override("Microsoft.AspNetCore.Hosting", LogEventLevel.Warning)
+            .MinimumLevel.Override("Microsoft.AspNetCore.Mvc", LogEventLevel.Warning)
+            .MinimumLevel.Override("Microsoft.AspNetCore.Routing", LogEventLevel.Warning)
+            .WriteTo.Console(theme: AnsiConsoleTheme.Code);
+
+        if (config.SeqLogUrl != null)
+        {
+            logCfg.WriteTo.Seq(config.SeqLogUrl, restrictedToMinimumLevel: LogEventLevel.Verbose);
+        }
+
+        Log.Logger = logCfg.CreateLogger();
+
+        // AddSerilog doesn't seem to add an ILogger to the service collection, so add that manually.
+        builder.Services.AddSerilog().AddSingleton(Log.Logger);
+
+        return builder;
+    }
+
+    public static Config AddConfiguration(this WebApplicationBuilder builder)
+    {
+
+        builder.Configuration.Sources.Clear();
+        builder.Configuration.AddConfiguration();
+
+        var config = builder.Configuration.Get<Config>() ?? new();
+        builder.Services.AddSingleton(config);
+        return config;
+    }
+
+    public static IConfigurationBuilder AddConfiguration(this IConfigurationBuilder builder)
+    {
+        var file = Environment.GetEnvironmentVariable("FOXNOUNS_CONFIG_FILE") ?? "config.ini";
+
+        return builder
+            .SetBasePath(Directory.GetCurrentDirectory())
+            .AddIniFile(file, optional: false, reloadOnChange: true)
+            .AddEnvironmentVariables();
+    }
+}