[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

@@ -0,0 +1,23 @@
+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

@@ -0,0 +1,39 @@
+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();
+    }
+}

FictionArchive.Service.NovelService/Services/NovelServiceDbContext.cs

@@ -1,3 +1,4 @@
+using FictionArchive.Service.NovelService.Models.Localization;
 using FictionArchive.Service.NovelService.Models.Novels;
 using FictionArchive.Service.Shared.Services.Database;
 using Microsoft.EntityFrameworkCore;
@@ -11,4 +12,6 @@ public class NovelServiceDbContext(DbContextOptions options, ILogger<NovelServic
     public DbSet<Source> Sources { get; set; }
     public DbSet<TranslationEngine> TranslationEngines { get; set; }
     public DbSet<NovelTag> Tags { get; set; }
+    public DbSet<LocalizationKey> LocalizationKeys { get; set; }
+    public DbSet<LocalizationRequest> LocalizationRequests { get; set; }
 }

FictionArchive.Service.NovelService/Services/NovelUpdateService.cs

@@ -0,0 +1,111 @@
+using FictionArchive.Service.NovelService.Models.Enums;
+using FictionArchive.Service.NovelService.Models.Localization;
+using FictionArchive.Service.NovelService.Models.Novels;
+using FictionArchive.Service.NovelService.Models.SourceAdapters;
+using FictionArchive.Service.NovelService.Services.SourceAdapters;
+using Microsoft.EntityFrameworkCore;
+
+namespace FictionArchive.Service.NovelService.Services;
+
+public class NovelUpdateService
+{
+    private readonly NovelServiceDbContext _dbContext;
+    private readonly ILogger<NovelUpdateService> _logger;
+    private readonly IEnumerable<ISourceAdapter> _sourceAdapters;
+
+    public NovelUpdateService(NovelServiceDbContext dbContext, ILogger<NovelUpdateService> logger, IEnumerable<ISourceAdapter> sourceAdapters)
+    {
+        _dbContext = dbContext;
+        _logger = logger;
+        _sourceAdapters = sourceAdapters;
+    }
+
+    public async Task<Novel> ImportNovel(string novelUrl)
+    {
+        NovelMetadata? metadata = null;
+        foreach (ISourceAdapter sourceAdapter in _sourceAdapters)
+        {
+            if (await sourceAdapter.CanProcessNovel(novelUrl))
+            {
+                metadata = await sourceAdapter.GetMetadata(novelUrl);
+            }
+        }
+
+        if (metadata == null)
+        {
+            throw new NotSupportedException("The provided novel url is currently unsupported.");
+        }
+
+        var systemTags = metadata.SystemTags.Select(tag => new NovelTag()
+        {
+            Key = tag,
+            DisplayName = LocalizationKey.CreateFromText(tag, metadata.RawLanguage),
+            TagType = TagType.System
+        });
+        var sourceTags = metadata.SourceTags.Select(tag => new NovelTag()
+        {
+            Key = tag,
+            DisplayName = LocalizationKey.CreateFromText(tag, metadata.RawLanguage),
+            TagType = TagType.External
+        });
+
+        var addedNovel = _dbContext.Novels.Add(new Novel()
+        {
+            Author = new Person()
+            {
+                Name = LocalizationKey.CreateFromText(metadata.AuthorName, metadata.RawLanguage),
+                ExternalUrl = metadata.AuthorUrl,
+            },
+            RawLanguage = metadata.RawLanguage,
+            Url = metadata.Url,
+            ExternalId = metadata.ExternalId,
+            Chapters = metadata.Chapters.Select(chapter =>
+            {
+                return new Chapter()
+                {
+                    Order = chapter.Order,
+                    Url = chapter.Url,
+                    Revision = chapter.Revision,
+                    Name = LocalizationKey.CreateFromText(chapter.Name, metadata.RawLanguage),
+                    Body = new LocalizationKey()
+                    {
+                        Texts = new List<LocalizationText>()
+                    }
+                };
+            }).ToList(),
+            Description = LocalizationKey.CreateFromText(metadata.Description, metadata.RawLanguage),
+            Name = LocalizationKey.CreateFromText(metadata.Name, metadata.RawLanguage),
+            RawStatus = metadata.RawStatus,
+            Tags = sourceTags.Concat(systemTags).ToList(),
+            Source = new Source()
+            {
+                Name = metadata.SourceDescriptor.Name,
+                Url = metadata.SourceDescriptor.Url,
+                Key = metadata.SourceDescriptor.Key,
+            }
+        });
+        await _dbContext.SaveChangesAsync();
+
+        return addedNovel.Entity;
+    }
+
+    public async Task<Chapter> PullChapterContents(uint novelId, uint chapterNumber)
+    {
+        var novel = await _dbContext.Novels.Where(novel => novel.Id == novelId)
+            .Include(novel => novel.Chapters)
+            .ThenInclude(chapter => chapter.Body)
+            .ThenInclude(body => body.Texts)
+            .Include(novel => novel.Source)
+            .FirstOrDefaultAsync();
+        var chapter = novel.Chapters.Where(chapter => chapter.Order == chapterNumber).FirstOrDefault();
+        var adapter = _sourceAdapters.FirstOrDefault(adapter => adapter.SourceDescriptor.Key == novel.Source.Key);
+        var rawChapter = await adapter.GetRawChapter(chapter.Url);
+        chapter.Body.Texts.Add(new LocalizationText()
+        {
+            Text = rawChapter,
+            Language = novel.RawLanguage
+        });
+        await _dbContext.SaveChangesAsync();
+        return chapter;
+    }
+}