Catalogger.NET/Catalogger.Backend/Program.cs

using Catalogger.Backend.Bot.Commands;
using Catalogger.Backend.Database;
using Catalogger.Backend.Extensions;
using Catalogger.Backend.Services;
using Newtonsoft.Json.Serialization;
using Prometheus;
using Remora.Commands.Extensions;
using Remora.Discord.API.Abstractions.Gateway.Commands;
using Remora.Discord.Commands.Extensions;
using Remora.Discord.Extensions.Extensions;
using Remora.Discord.Gateway;
using Remora.Discord.Hosting.Extensions;
using Remora.Discord.Interactivity.Extensions;
using Remora.Discord.Pagination.Extensions;
using Serilog;
using Metrics = Prometheus.Metrics;

var builder = WebApplication.CreateBuilder(args);
var config = builder.AddConfiguration();
builder.AddSerilog(config);

builder.Services
    .AddControllers()
    .AddNewtonsoftJson(o => o.SerializerSettings.ContractResolver =
        new DefaultContractResolver
        {
            NamingStrategy = new SnakeCaseNamingStrategy()
        });

builder.Host
    .AddShardedDiscordService(_ => config.Discord.Token)
    .ConfigureServices(s =>
        s.AddRespondersFromAssembly(typeof(Program).Assembly)
            .Configure<DiscordGatewayClientOptions>(g =>
                g.Intents = GatewayIntents.Guilds |
                            GatewayIntents.GuildBans |
                            GatewayIntents.GuildInvites |
                            GatewayIntents.GuildMembers |
                            GatewayIntents.GuildMessages |
                            GatewayIntents.GuildWebhooks |
                            GatewayIntents.MessageContents |
                            GatewayIntents.GuildEmojisAndStickers)
            .AddDiscordCommands(enableSlash: true, useDefaultCommandResponder: false)
            .AddCommandTree()
            // Start command tree
            .WithCommandGroup<MetaCommands>()
            .WithCommandGroup<ChannelCommands>()
            .WithCommandGroup<KeyRoleCommands>()
            // End command tree
            .Finish()
            .AddPagination()
            .AddInteractivity()
            .AddInteractionGroup<ChannelCommandsComponents>()
    );

// Add metric server
// If metrics are disabled (Logging.EnableMetrics = false), also add a background service that updates
// metrics every minute, as some commands rely on them.
builder.Services.AddMetricServer(o => o.Port = (ushort)config.Logging.MetricsPort);
if (!config.Logging.EnableMetrics)
    builder.Services.AddHostedService<BackgroundMetricsCollectionService>();

builder.Services
    .AddDbContext<DatabaseContext>()
    .MaybeAddRedisCaches(config)
    .AddCustomServices()
    .AddEndpointsApiExplorer()
    .AddSwaggerGen();

var app = builder.Build();

await app.Initialize();

app.UseSerilogRequestLogging();
app.UseRouting();
app.UseHttpMetrics();
app.UseSwagger();
app.UseSwaggerUI();
app.UseCors();
app.MapControllers();

app.Urls.Clear();
app.Urls.Add(config.Web.Address);

// Make sure metrics are updated whenever Prometheus scrapes them
Metrics.DefaultRegistry.AddBeforeCollectCallback(async ct =>
    await app.Services.GetRequiredService<MetricsCollectionService>().CollectMetricsAsync(ct));

app.Run();
Log.CloseAndFlush();