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91 lines
3.8 KiB
Markdown
# Adding a new service
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> *Workflow template auto-derived from 8 existing exemplar(s).*
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When you need to add a new application service or a long-running background task to EchoHub.Server, add a new type alongside the existing services and register it where services are composed. The examples in src/EchoHub.Server/Services show both ordinary services and BackgroundService-based hosted tasks; model a new instance on those concrete types and then wire it into the application startup.
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## Reference implementation
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```csharp
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/// <summary>
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/// Background service that periodically unmutes users whose timed mute has expired.
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/// </summary>
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public sealed class MuteExpirationService : BackgroundService
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{
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private static readonly TimeSpan CheckInterval = TimeSpan.FromSeconds(15);
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private readonly IServiceScopeFactory _scopeFactory;
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private readonly ILogger<MuteExpirationService> _logger;
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public MuteExpirationService(IServiceScopeFactory scopeFactory, ILogger<MuteExpirationService> logger)
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{
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_scopeFactory = scopeFactory;
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_logger = logger;
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}
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protected override async Task ExecuteAsync(CancellationToken stoppingToken)
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{
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await Task.Yield();
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while (!stoppingToken.IsCancellationRequested)
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{
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try
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{
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await UnmuteExpiredUsersAsync(stoppingToken);
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}
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catch (Exception ex) when (ex is not OperationCanceledException)
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{
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_logger.LogWarning(ex, "Error checking mute expirations");
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}
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await Task.Delay(CheckInterval, stoppingToken);
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}
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}
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private async Task UnmuteExpiredUsersAsync(CancellationToken ct)
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{
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using var scope = _scopeFactory.CreateScope();
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var db = scope.ServiceProvider.GetRequiredService<EchoHubDbContext>();
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var now = DateTimeOffset.UtcNow;
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var expired = await db.Users
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.Where(u => u.IsMuted && u.MutedUntil.HasValue && u.MutedUntil.Value <= now)
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.ToListAsync(ct);
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if (expired.Count == 0)
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return;
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foreach (var user in expired)
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{
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user.IsMuted = false;
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user.MutedUntil = null;
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_logger.LogInformation("Auto-unmuted user {Username} (timed mute expired)", user.Username);
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}
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await db.SaveChangesAsync(ct);
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}
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}
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```
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## Where it lives
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Create the new service type under src/EchoHub.Server/Services. The repository contains multiple service types in that folder whose type names end with "Service", for example ChannelService, ChatService, FileCleanupService, FileStorageService, LinkEmbedService, MessageEncryptionService, MuteExpirationService, and ServerDirectoryService.
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## Wiring
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Registration and composition of services was detected in src/EchoHub.Server/Program.cs. Add the new service's registration in that file alongside the existing service registrations; inspect src/EchoHub.Server/Program.cs and the exemplars to follow the same wiring approach used for other services.
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## Existing examples
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- [`ChannelService`](../../Code/src/EchoHub.Server/Services/ChannelService.cs.md)
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- [`ChatService`](../../Code/src/EchoHub.Server/Services/ChatService.cs.md)
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- [`FileCleanupService`](../../Code/src/EchoHub.Server/Services/FileCleanupService.cs.md)
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- [`FileStorageService`](../../Code/src/EchoHub.Server/Services/FileStorageService.cs.md)
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- [`LinkEmbedService`](../../Code/src/EchoHub.Server/Services/LinkEmbedService.cs.md)
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- [`MessageEncryptionService`](../../Code/src/EchoHub.Server/Services/MessageEncryptionService.cs.md)
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- [`MuteExpirationService`](../../Code/src/EchoHub.Server/Services/MuteExpirationService.cs.md)
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- [`ServerDirectoryService`](../../Code/src/EchoHub.Server/Services/ServerDirectoryService.cs.md)
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---
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*Synthesised by AurionDocs on 2026-07-23 09:35:20 UTC*
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