[FA-4] Adds an event bus infrastructure, a RabbitMQ implementation and rewires existing mutations on NovelService to utilize it.

FictionArchive.Service.NovelService/Services/EventHandlers/ChapterPullRequestedEventHandler.cs

@@ -0,0 +1,19 @@
+using FictionArchive.Service.NovelService.Models.IntegrationEvents;
+using FictionArchive.Service.Shared.Services.EventBus;
+
+namespace FictionArchive.Service.NovelService.Services.EventHandlers;
+
+public class ChapterPullRequestedEventHandler : IIntegrationEventHandler<ChapterPullRequestedEvent>
+{
+    private readonly NovelUpdateService _novelUpdateService;
+
+    public ChapterPullRequestedEventHandler(NovelUpdateService novelUpdateService)
+    {
+        _novelUpdateService = novelUpdateService;
+    }
+
+    public async Task Handle(ChapterPullRequestedEvent @event)
+    {
+        await _novelUpdateService.PullChapterContents(@event.NovelId, @event.ChapterNumber);
+    }
+}

FictionArchive.Service.NovelService/Services/EventHandlers/NovelUpdateRequestedEventHandler.cs

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+using FictionArchive.Service.NovelService.Models.IntegrationEvents;
+using FictionArchive.Service.Shared.Services.EventBus;
+
+namespace FictionArchive.Service.NovelService.Services.EventHandlers;
+
+public class NovelUpdateRequestedEventHandler : IIntegrationEventHandler<NovelUpdateRequestedEvent>
+{
+    private readonly ILogger<NovelUpdateRequestedEventHandler> _logger;
+    private readonly IEventBus _eventBus;
+    private readonly NovelUpdateService _novelUpdateService;
+
+    public NovelUpdateRequestedEventHandler(ILogger<NovelUpdateRequestedEventHandler> logger, IEventBus eventBus, NovelUpdateService novelUpdateService)
+    {
+        _logger = logger;
+        _eventBus = eventBus;
+        _novelUpdateService = novelUpdateService;
+    }
+
+    public async Task Handle(NovelUpdateRequestedEvent @event)
+    {
+        await _novelUpdateService.ImportNovel(@event.NovelUrl);
+    }
+}

FictionArchive.Service.NovelService/Services/EventHandlers/TranslationRequestCompletedEventHandler.cs

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+using FictionArchive.Service.NovelService.Models.IntegrationEvents;
+using FictionArchive.Service.NovelService.Models.Localization;
+using FictionArchive.Service.Shared.Services.EventBus;
+using Microsoft.EntityFrameworkCore;
+
+namespace FictionArchive.Service.NovelService.Services.EventHandlers;
+
+public class TranslationRequestCompletedEventHandler : IIntegrationEventHandler<TranslationRequestCompletedEvent>
+{
+    private readonly ILogger<TranslationRequestCompletedEventHandler> _logger;
+    private readonly NovelServiceDbContext _dbContext;
+
+    public TranslationRequestCompletedEventHandler(ILogger<TranslationRequestCompletedEventHandler> logger, NovelServiceDbContext dbContext)
+    {
+        _logger = logger;
+        _dbContext = dbContext;
+    }
+
+    public async Task Handle(TranslationRequestCompletedEvent @event)
+    {
+        var localizationRequest = await _dbContext.LocalizationRequests.Include(r => r.KeyRequestedForTranslation)
+            .ThenInclude(lk => lk.Texts)
+            .FirstOrDefaultAsync(lk => lk.Id == @event.TranslationRequestId);
+        if (localizationRequest == null)
+        {
+            // Not one of our requests, discard it
+            return;
+        }
+        
+        localizationRequest.KeyRequestedForTranslation.Texts.Add(new LocalizationText()
+        {
+            Language = localizationRequest.TranslateTo,
+            Text = @event.TranslatedText,
+            TranslationEngine = localizationRequest.Engine
+        });
+        _dbContext.LocalizationRequests.Remove(localizationRequest);
+        await _dbContext.SaveChangesAsync();
+    }
+}