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

FictionArchive.Service.NovelService/FictionArchive.Service.NovelService.csproj

@@ -8,6 +8,10 @@
     </PropertyGroup>
 
     <ItemGroup>
+        <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="9.0.11">
+          <PrivateAssets>all</PrivateAssets>
+          <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+        </PackageReference>
         <PackageReference Include="Swashbuckle.AspNetCore" Version="6.6.2"/>
     </ItemGroup>
 

FictionArchive.Service.NovelService/GraphQL/Mutation.cs

@@ -1,107 +1,37 @@
 using FictionArchive.Service.NovelService.Models.Enums;
+using FictionArchive.Service.NovelService.Models.IntegrationEvents;
 using FictionArchive.Service.NovelService.Models.Localization;
 using FictionArchive.Service.NovelService.Models.Novels;
 using FictionArchive.Service.NovelService.Models.SourceAdapters;
 using FictionArchive.Service.NovelService.Services;
 using FictionArchive.Service.NovelService.Services.SourceAdapters;
+using FictionArchive.Service.Shared.Services.EventBus;
 using Microsoft.EntityFrameworkCore;
 
 namespace FictionArchive.Service.NovelService.GraphQL;
 
 public class Mutation
 {
-    // TODO Make this kick off a job in the background somehow. Probably want to think of how jobs will work across services
+    public async Task<NovelUpdateRequestedEvent> ImportNovel(string novelUrl, IEventBus eventBus)
-    // Also of course need to make it a proper 'upsert'
-    public async Task<Novel> ImportNovel(string novelUrl, NovelServiceDbContext dbContext,
-        IEnumerable<ISourceAdapter> adapters)
     {
-        NovelMetadata? metadata = null;
+        var importNovelRequestEvent = new NovelUpdateRequestedEvent()
-        foreach (ISourceAdapter sourceAdapter in adapters)
         {
-            if (await sourceAdapter.CanProcessNovel(novelUrl))
+            NovelUrl = novelUrl
-            {
+        };
-                metadata = await sourceAdapter.GetMetadata(novelUrl);
+        await eventBus.Publish(importNovelRequestEvent);
-            }
+        return importNovelRequestEvent;
-        }
-
-        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> FetchChapterContents(uint novelId,
+    public async Task<ChapterPullRequestedEvent> FetchChapterContents(uint novelId,
         uint chapterNumber,
-        NovelServiceDbContext dbContext,
+        IEventBus eventBus)
-        IEnumerable<ISourceAdapter> sourceAdapters)
     {
-        var novel = await dbContext.Novels.Where(novel => novel.Id == novelId)
+        var chapterPullEvent = new ChapterPullRequestedEvent()
-            .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,
+            NovelId = novelId,
-            Language = novel.RawLanguage
+            ChapterNumber = chapterNumber
-        });
+        };
-        await dbContext.SaveChangesAsync();
+        await eventBus.Publish(chapterPullEvent);
-        return chapter;
+        return chapterPullEvent;
     }
 }

FictionArchive.Service.NovelService/Migrations/20251120012317_Initial.Designer.cs

@@ -1,4 +1,5 @@
 // <auto-generated />
+using System;
 using FictionArchive.Service.NovelService.Services;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Infrastructure;
@@ -12,7 +13,7 @@ using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
 namespace FictionArchive.Service.NovelService.Migrations
 {
     [DbContext(typeof(NovelServiceDbContext))]
-    [Migration("20251118045235_Initial")]
+    [Migration("20251120012317_Initial")]
     partial class Initial
     {
         /// <inheritdoc />
@@ -27,11 +28,9 @@ namespace FictionArchive.Service.NovelService.Migrations
 
             modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Localization.LocalizationKey", b =>
                 {
-                    b.Property<long>("Id")
+                    b.Property<Guid>("Id")
                         .ValueGeneratedOnAdd()
-                        .HasColumnType("bigint");
+                        .HasColumnType("uuid");
-
-                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<long>("Id"));
 
                     b.Property<Instant>("CreatedTime")
                         .HasColumnType("timestamp with time zone");
@@ -41,16 +40,44 @@ namespace FictionArchive.Service.NovelService.Migrations
 
                     b.HasKey("Id");
 
-                    b.ToTable("LocalizationKey");
+                    b.ToTable("LocalizationKeys");
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Localization.LocalizationRequest", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<Instant>("CreatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<long>("EngineId")
+                        .HasColumnType("bigint");
+
+                    b.Property<Guid>("KeyRequestedForTranslationId")
+                        .HasColumnType("uuid");
+
+                    b.Property<Instant>("LastUpdatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<int>("TranslateTo")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("EngineId");
+
+                    b.HasIndex("KeyRequestedForTranslationId");
+
+                    b.ToTable("LocalizationRequests");
                 });
 
             modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Localization.LocalizationText", b =>
                 {
-                    b.Property<long>("Id")
+                    b.Property<Guid>("Id")
                         .ValueGeneratedOnAdd()
-                        .HasColumnType("bigint");
+                        .HasColumnType("uuid");
-
-                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<long>("Id"));
 
                     b.Property<Instant>("CreatedTime")
                         .HasColumnType("timestamp with time zone");
@@ -61,8 +88,8 @@ namespace FictionArchive.Service.NovelService.Migrations
                     b.Property<Instant>("LastUpdatedTime")
                         .HasColumnType("timestamp with time zone");
 
-                    b.Property<long?>("LocalizationKeyId")
+                    b.Property<Guid?>("LocalizationKeyId")
-                        .HasColumnType("bigint");
+                        .HasColumnType("uuid");
 
                     b.Property<string>("Text")
                         .IsRequired()
@@ -88,8 +115,8 @@ namespace FictionArchive.Service.NovelService.Migrations
 
                     NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<long>("Id"));
 
-                    b.Property<long>("BodyId")
+                    b.Property<Guid>("BodyId")
-                        .HasColumnType("bigint");
+                        .HasColumnType("uuid");
 
                     b.Property<Instant>("CreatedTime")
                         .HasColumnType("timestamp with time zone");
@@ -97,8 +124,8 @@ namespace FictionArchive.Service.NovelService.Migrations
                     b.Property<Instant>("LastUpdatedTime")
                         .HasColumnType("timestamp with time zone");
 
-                    b.Property<long>("NameId")
+                    b.Property<Guid>("NameId")
-                        .HasColumnType("bigint");
+                        .HasColumnType("uuid");
 
                     b.Property<long?>("NovelId")
                         .HasColumnType("bigint");
@@ -137,8 +164,8 @@ namespace FictionArchive.Service.NovelService.Migrations
                     b.Property<Instant>("CreatedTime")
                         .HasColumnType("timestamp with time zone");
 
-                    b.Property<long>("DescriptionId")
+                    b.Property<Guid>("DescriptionId")
-                        .HasColumnType("bigint");
+                        .HasColumnType("uuid");
 
                     b.Property<string>("ExternalId")
                         .IsRequired()
@@ -147,8 +174,8 @@ namespace FictionArchive.Service.NovelService.Migrations
                     b.Property<Instant>("LastUpdatedTime")
                         .HasColumnType("timestamp with time zone");
 
-                    b.Property<long>("NameId")
+                    b.Property<Guid>("NameId")
-                        .HasColumnType("bigint");
+                        .HasColumnType("uuid");
 
                     b.Property<int>("RawLanguage")
                         .HasColumnType("integer");
@@ -190,8 +217,8 @@ namespace FictionArchive.Service.NovelService.Migrations
                     b.Property<Instant>("CreatedTime")
                         .HasColumnType("timestamp with time zone");
 
-                    b.Property<long>("DisplayNameId")
+                    b.Property<Guid>("DisplayNameId")
-                        .HasColumnType("bigint");
+                        .HasColumnType("uuid");
 
                     b.Property<string>("Key")
                         .IsRequired()
@@ -232,12 +259,13 @@ namespace FictionArchive.Service.NovelService.Migrations
                     b.Property<Instant>("LastUpdatedTime")
                         .HasColumnType("timestamp with time zone");
 
-                    b.Property<string>("Name")
+                    b.Property<Guid>("NameId")
-                        .IsRequired()
+                        .HasColumnType("uuid");
-                        .HasColumnType("text");
 
                     b.HasKey("Id");
 
+                    b.HasIndex("NameId");
+
                     b.ToTable("Person");
                 });
 
@@ -283,10 +311,6 @@ namespace FictionArchive.Service.NovelService.Migrations
                     b.Property<Instant>("CreatedTime")
                         .HasColumnType("timestamp with time zone");
 
-                    b.Property<string>("DisplayName")
-                        .IsRequired()
-                        .HasColumnType("text");
-
                     b.Property<string>("Key")
                         .IsRequired()
                         .HasColumnType("text");
@@ -314,6 +338,25 @@ namespace FictionArchive.Service.NovelService.Migrations
                     b.ToTable("NovelNovelTag");
                 });
 
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Localization.LocalizationRequest", b =>
+                {
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Novels.TranslationEngine", "Engine")
+                        .WithMany()
+                        .HasForeignKey("EngineId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Localization.LocalizationKey", "KeyRequestedForTranslation")
+                        .WithMany()
+                        .HasForeignKey("KeyRequestedForTranslationId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Engine");
+
+                    b.Navigation("KeyRequestedForTranslation");
+                });
+
             modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Localization.LocalizationText", b =>
                 {
                     b.HasOne("FictionArchive.Service.NovelService.Models.Localization.LocalizationKey", null)
@@ -402,6 +445,17 @@ namespace FictionArchive.Service.NovelService.Migrations
                     b.Navigation("Source");
                 });
 
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Novels.Person", b =>
+                {
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Localization.LocalizationKey", "Name")
+                        .WithMany()
+                        .HasForeignKey("NameId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Name");
+                });
+
             modelBuilder.Entity("NovelNovelTag", b =>
                 {
                     b.HasOne("FictionArchive.Service.NovelService.Models.Novels.Novel", null)

FictionArchive.Service.NovelService/Migrations/20251120012317_Initial.cs

@@ -1,4 +1,5 @@
-using Microsoft.EntityFrameworkCore.Migrations;
+using System;
+using Microsoft.EntityFrameworkCore.Migrations;
 using NodaTime;
 using Npgsql.EntityFrameworkCore.PostgreSQL.Metadata;
 
@@ -13,33 +14,16 @@ namespace FictionArchive.Service.NovelService.Migrations
         protected override void Up(MigrationBuilder migrationBuilder)
         {
             migrationBuilder.CreateTable(
-                name: "LocalizationKey",
+                name: "LocalizationKeys",
                 columns: table => new
                 {
-                    Id = table.Column<long>(type: "bigint", nullable: false)
+                    Id = table.Column<Guid>(type: "uuid", nullable: false),
-                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
                     CreatedTime = table.Column<Instant>(type: "timestamp with time zone", nullable: false),
                     LastUpdatedTime = table.Column<Instant>(type: "timestamp with time zone", nullable: false)
                 },
                 constraints: table =>
                 {
-                    table.PrimaryKey("PK_LocalizationKey", x => x.Id);
+                    table.PrimaryKey("PK_LocalizationKeys", x => x.Id);
-                });
-
-            migrationBuilder.CreateTable(
-                name: "Person",
-                columns: table => new
-                {
-                    Id = table.Column<long>(type: "bigint", nullable: false)
-                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
-                    Name = table.Column<string>(type: "text", nullable: false),
-                    ExternalUrl = table.Column<string>(type: "text", nullable: true),
-                    CreatedTime = table.Column<Instant>(type: "timestamp with time zone", nullable: false),
-                    LastUpdatedTime = table.Column<Instant>(type: "timestamp with time zone", nullable: false)
-                },
-                constraints: table =>
-                {
-                    table.PrimaryKey("PK_Person", x => x.Id);
                 });
 
             migrationBuilder.CreateTable(
@@ -66,7 +50,6 @@ namespace FictionArchive.Service.NovelService.Migrations
                     Id = table.Column<long>(type: "bigint", nullable: false)
                         .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
                     Key = table.Column<string>(type: "text", nullable: false),
-                    DisplayName = table.Column<string>(type: "text", nullable: false),
                     CreatedTime = table.Column<Instant>(type: "timestamp with time zone", nullable: false),
                     LastUpdatedTime = table.Column<Instant>(type: "timestamp with time zone", nullable: false)
                 },
@@ -75,6 +58,112 @@ namespace FictionArchive.Service.NovelService.Migrations
                     table.PrimaryKey("PK_TranslationEngines", x => x.Id);
                 });
 
+            migrationBuilder.CreateTable(
+                name: "Person",
+                columns: table => new
+                {
+                    Id = table.Column<long>(type: "bigint", nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    NameId = table.Column<Guid>(type: "uuid", nullable: false),
+                    ExternalUrl = table.Column<string>(type: "text", nullable: true),
+                    CreatedTime = table.Column<Instant>(type: "timestamp with time zone", nullable: false),
+                    LastUpdatedTime = table.Column<Instant>(type: "timestamp with time zone", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Person", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_Person_LocalizationKeys_NameId",
+                        column: x => x.NameId,
+                        principalTable: "LocalizationKeys",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "Tags",
+                columns: table => new
+                {
+                    Id = table.Column<long>(type: "bigint", nullable: false)
+                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
+                    Key = table.Column<string>(type: "text", nullable: false),
+                    DisplayNameId = table.Column<Guid>(type: "uuid", nullable: false),
+                    TagType = table.Column<int>(type: "integer", nullable: false),
+                    SourceId = table.Column<long>(type: "bigint", nullable: true),
+                    CreatedTime = table.Column<Instant>(type: "timestamp with time zone", nullable: false),
+                    LastUpdatedTime = table.Column<Instant>(type: "timestamp with time zone", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_Tags", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_Tags_LocalizationKeys_DisplayNameId",
+                        column: x => x.DisplayNameId,
+                        principalTable: "LocalizationKeys",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                    table.ForeignKey(
+                        name: "FK_Tags_Sources_SourceId",
+                        column: x => x.SourceId,
+                        principalTable: "Sources",
+                        principalColumn: "Id");
+                });
+
+            migrationBuilder.CreateTable(
+                name: "LocalizationRequests",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uuid", nullable: false),
+                    KeyRequestedForTranslationId = table.Column<Guid>(type: "uuid", nullable: false),
+                    TranslateTo = table.Column<int>(type: "integer", nullable: false),
+                    EngineId = table.Column<long>(type: "bigint", nullable: false),
+                    CreatedTime = table.Column<Instant>(type: "timestamp with time zone", nullable: false),
+                    LastUpdatedTime = table.Column<Instant>(type: "timestamp with time zone", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_LocalizationRequests", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_LocalizationRequests_LocalizationKeys_KeyRequestedForTransl~",
+                        column: x => x.KeyRequestedForTranslationId,
+                        principalTable: "LocalizationKeys",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                    table.ForeignKey(
+                        name: "FK_LocalizationRequests_TranslationEngines_EngineId",
+                        column: x => x.EngineId,
+                        principalTable: "TranslationEngines",
+                        principalColumn: "Id",
+                        onDelete: ReferentialAction.Cascade);
+                });
+
+            migrationBuilder.CreateTable(
+                name: "LocalizationText",
+                columns: table => new
+                {
+                    Id = table.Column<Guid>(type: "uuid", nullable: false),
+                    Language = table.Column<int>(type: "integer", nullable: false),
+                    Text = table.Column<string>(type: "text", nullable: false),
+                    TranslationEngineId = table.Column<long>(type: "bigint", nullable: true),
+                    LocalizationKeyId = table.Column<Guid>(type: "uuid", nullable: true),
+                    CreatedTime = table.Column<Instant>(type: "timestamp with time zone", nullable: false),
+                    LastUpdatedTime = table.Column<Instant>(type: "timestamp with time zone", nullable: false)
+                },
+                constraints: table =>
+                {
+                    table.PrimaryKey("PK_LocalizationText", x => x.Id);
+                    table.ForeignKey(
+                        name: "FK_LocalizationText_LocalizationKeys_LocalizationKeyId",
+                        column: x => x.LocalizationKeyId,
+                        principalTable: "LocalizationKeys",
+                        principalColumn: "Id");
+                    table.ForeignKey(
+                        name: "FK_LocalizationText_TranslationEngines_TranslationEngineId",
+                        column: x => x.TranslationEngineId,
+                        principalTable: "TranslationEngines",
+                        principalColumn: "Id");
+                });
+
             migrationBuilder.CreateTable(
                 name: "Novels",
                 columns: table => new
@@ -88,8 +177,8 @@ namespace FictionArchive.Service.NovelService.Migrations
                     StatusOverride = table.Column<int>(type: "integer", nullable: true),
                     SourceId = table.Column<long>(type: "bigint", nullable: false),
                     ExternalId = table.Column<string>(type: "text", nullable: false),
-                    NameId = table.Column<long>(type: "bigint", nullable: false),
+                    NameId = table.Column<Guid>(type: "uuid", nullable: false),
-                    DescriptionId = table.Column<long>(type: "bigint", nullable: false),
+                    DescriptionId = table.Column<Guid>(type: "uuid", nullable: false),
                     CreatedTime = table.Column<Instant>(type: "timestamp with time zone", nullable: false),
                     LastUpdatedTime = table.Column<Instant>(type: "timestamp with time zone", nullable: false)
                 },
@@ -97,15 +186,15 @@ namespace FictionArchive.Service.NovelService.Migrations
                 {
                     table.PrimaryKey("PK_Novels", x => x.Id);
                     table.ForeignKey(
-                        name: "FK_Novels_LocalizationKey_DescriptionId",
+                        name: "FK_Novels_LocalizationKeys_DescriptionId",
                         column: x => x.DescriptionId,
-                        principalTable: "LocalizationKey",
+                        principalTable: "LocalizationKeys",
                         principalColumn: "Id",
                         onDelete: ReferentialAction.Cascade);
                     table.ForeignKey(
-                        name: "FK_Novels_LocalizationKey_NameId",
+                        name: "FK_Novels_LocalizationKeys_NameId",
                         column: x => x.NameId,
-                        principalTable: "LocalizationKey",
+                        principalTable: "LocalizationKeys",
                         principalColumn: "Id",
                         onDelete: ReferentialAction.Cascade);
                     table.ForeignKey(
@@ -122,63 +211,6 @@ namespace FictionArchive.Service.NovelService.Migrations
                         onDelete: ReferentialAction.Cascade);
                 });
 
-            migrationBuilder.CreateTable(
-                name: "Tags",
-                columns: table => new
-                {
-                    Id = table.Column<long>(type: "bigint", nullable: false)
-                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
-                    Key = table.Column<string>(type: "text", nullable: false),
-                    DisplayNameId = table.Column<long>(type: "bigint", nullable: false),
-                    TagType = table.Column<int>(type: "integer", nullable: false),
-                    SourceId = table.Column<long>(type: "bigint", nullable: true),
-                    CreatedTime = table.Column<Instant>(type: "timestamp with time zone", nullable: false),
-                    LastUpdatedTime = table.Column<Instant>(type: "timestamp with time zone", nullable: false)
-                },
-                constraints: table =>
-                {
-                    table.PrimaryKey("PK_Tags", x => x.Id);
-                    table.ForeignKey(
-                        name: "FK_Tags_LocalizationKey_DisplayNameId",
-                        column: x => x.DisplayNameId,
-                        principalTable: "LocalizationKey",
-                        principalColumn: "Id",
-                        onDelete: ReferentialAction.Cascade);
-                    table.ForeignKey(
-                        name: "FK_Tags_Sources_SourceId",
-                        column: x => x.SourceId,
-                        principalTable: "Sources",
-                        principalColumn: "Id");
-                });
-
-            migrationBuilder.CreateTable(
-                name: "LocalizationText",
-                columns: table => new
-                {
-                    Id = table.Column<long>(type: "bigint", nullable: false)
-                        .Annotation("Npgsql:ValueGenerationStrategy", NpgsqlValueGenerationStrategy.IdentityByDefaultColumn),
-                    Language = table.Column<int>(type: "integer", nullable: false),
-                    Text = table.Column<string>(type: "text", nullable: false),
-                    TranslationEngineId = table.Column<long>(type: "bigint", nullable: true),
-                    LocalizationKeyId = table.Column<long>(type: "bigint", nullable: true),
-                    CreatedTime = table.Column<Instant>(type: "timestamp with time zone", nullable: false),
-                    LastUpdatedTime = table.Column<Instant>(type: "timestamp with time zone", nullable: false)
-                },
-                constraints: table =>
-                {
-                    table.PrimaryKey("PK_LocalizationText", x => x.Id);
-                    table.ForeignKey(
-                        name: "FK_LocalizationText_LocalizationKey_LocalizationKeyId",
-                        column: x => x.LocalizationKeyId,
-                        principalTable: "LocalizationKey",
-                        principalColumn: "Id");
-                    table.ForeignKey(
-                        name: "FK_LocalizationText_TranslationEngines_TranslationEngineId",
-                        column: x => x.TranslationEngineId,
-                        principalTable: "TranslationEngines",
-                        principalColumn: "Id");
-                });
-
             migrationBuilder.CreateTable(
                 name: "Chapter",
                 columns: table => new
@@ -188,8 +220,8 @@ namespace FictionArchive.Service.NovelService.Migrations
                     Revision = table.Column<long>(type: "bigint", nullable: false),
                     Order = table.Column<long>(type: "bigint", nullable: false),
                     Url = table.Column<string>(type: "text", nullable: true),
-                    NameId = table.Column<long>(type: "bigint", nullable: false),
+                    NameId = table.Column<Guid>(type: "uuid", nullable: false),
-                    BodyId = table.Column<long>(type: "bigint", nullable: false),
+                    BodyId = table.Column<Guid>(type: "uuid", nullable: false),
                     NovelId = table.Column<long>(type: "bigint", nullable: true),
                     CreatedTime = table.Column<Instant>(type: "timestamp with time zone", nullable: false),
                     LastUpdatedTime = table.Column<Instant>(type: "timestamp with time zone", nullable: false)
@@ -198,15 +230,15 @@ namespace FictionArchive.Service.NovelService.Migrations
                 {
                     table.PrimaryKey("PK_Chapter", x => x.Id);
                     table.ForeignKey(
-                        name: "FK_Chapter_LocalizationKey_BodyId",
+                        name: "FK_Chapter_LocalizationKeys_BodyId",
                         column: x => x.BodyId,
-                        principalTable: "LocalizationKey",
+                        principalTable: "LocalizationKeys",
                         principalColumn: "Id",
                         onDelete: ReferentialAction.Cascade);
                     table.ForeignKey(
-                        name: "FK_Chapter_LocalizationKey_NameId",
+                        name: "FK_Chapter_LocalizationKeys_NameId",
                         column: x => x.NameId,
-                        principalTable: "LocalizationKey",
+                        principalTable: "LocalizationKeys",
                         principalColumn: "Id",
                         onDelete: ReferentialAction.Cascade);
                     table.ForeignKey(
@@ -255,6 +287,16 @@ namespace FictionArchive.Service.NovelService.Migrations
                 table: "Chapter",
                 column: "NovelId");
 
+            migrationBuilder.CreateIndex(
+                name: "IX_LocalizationRequests_EngineId",
+                table: "LocalizationRequests",
+                column: "EngineId");
+
+            migrationBuilder.CreateIndex(
+                name: "IX_LocalizationRequests_KeyRequestedForTranslationId",
+                table: "LocalizationRequests",
+                column: "KeyRequestedForTranslationId");
+
             migrationBuilder.CreateIndex(
                 name: "IX_LocalizationText_LocalizationKeyId",
                 table: "LocalizationText",
@@ -290,6 +332,11 @@ namespace FictionArchive.Service.NovelService.Migrations
                 table: "Novels",
                 column: "SourceId");
 
+            migrationBuilder.CreateIndex(
+                name: "IX_Person_NameId",
+                table: "Person",
+                column: "NameId");
+
             migrationBuilder.CreateIndex(
                 name: "IX_Tags_DisplayNameId",
                 table: "Tags",
@@ -307,6 +354,9 @@ namespace FictionArchive.Service.NovelService.Migrations
             migrationBuilder.DropTable(
                 name: "Chapter");
 
+            migrationBuilder.DropTable(
+                name: "LocalizationRequests");
+
             migrationBuilder.DropTable(
                 name: "LocalizationText");
 
@@ -326,10 +376,10 @@ namespace FictionArchive.Service.NovelService.Migrations
                 name: "Person");
 
             migrationBuilder.DropTable(
-                name: "LocalizationKey");
+                name: "Sources");
 
             migrationBuilder.DropTable(
-                name: "Sources");
+                name: "LocalizationKeys");
         }
     }
 }

FictionArchive.Service.NovelService/Migrations/NovelServiceDbContextModelSnapshot.cs

@@ -1,4 +1,5 @@
 // <auto-generated />
+using System;
 using FictionArchive.Service.NovelService.Services;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore.Infrastructure;
@@ -24,11 +25,9 @@ namespace FictionArchive.Service.NovelService.Migrations
 
             modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Localization.LocalizationKey", b =>
                 {
-                    b.Property<long>("Id")
+                    b.Property<Guid>("Id")
                         .ValueGeneratedOnAdd()
-                        .HasColumnType("bigint");
+                        .HasColumnType("uuid");
-
-                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<long>("Id"));
 
                     b.Property<Instant>("CreatedTime")
                         .HasColumnType("timestamp with time zone");
@@ -38,16 +37,44 @@ namespace FictionArchive.Service.NovelService.Migrations
 
                     b.HasKey("Id");
 
-                    b.ToTable("LocalizationKey");
+                    b.ToTable("LocalizationKeys");
+                });
+
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Localization.LocalizationRequest", b =>
+                {
+                    b.Property<Guid>("Id")
+                        .ValueGeneratedOnAdd()
+                        .HasColumnType("uuid");
+
+                    b.Property<Instant>("CreatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<long>("EngineId")
+                        .HasColumnType("bigint");
+
+                    b.Property<Guid>("KeyRequestedForTranslationId")
+                        .HasColumnType("uuid");
+
+                    b.Property<Instant>("LastUpdatedTime")
+                        .HasColumnType("timestamp with time zone");
+
+                    b.Property<int>("TranslateTo")
+                        .HasColumnType("integer");
+
+                    b.HasKey("Id");
+
+                    b.HasIndex("EngineId");
+
+                    b.HasIndex("KeyRequestedForTranslationId");
+
+                    b.ToTable("LocalizationRequests");
                 });
 
             modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Localization.LocalizationText", b =>
                 {
-                    b.Property<long>("Id")
+                    b.Property<Guid>("Id")
                         .ValueGeneratedOnAdd()
-                        .HasColumnType("bigint");
+                        .HasColumnType("uuid");
-
-                    NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<long>("Id"));
 
                     b.Property<Instant>("CreatedTime")
                         .HasColumnType("timestamp with time zone");
@@ -58,8 +85,8 @@ namespace FictionArchive.Service.NovelService.Migrations
                     b.Property<Instant>("LastUpdatedTime")
                         .HasColumnType("timestamp with time zone");
 
-                    b.Property<long?>("LocalizationKeyId")
+                    b.Property<Guid?>("LocalizationKeyId")
-                        .HasColumnType("bigint");
+                        .HasColumnType("uuid");
 
                     b.Property<string>("Text")
                         .IsRequired()
@@ -85,8 +112,8 @@ namespace FictionArchive.Service.NovelService.Migrations
 
                     NpgsqlPropertyBuilderExtensions.UseIdentityByDefaultColumn(b.Property<long>("Id"));
 
-                    b.Property<long>("BodyId")
+                    b.Property<Guid>("BodyId")
-                        .HasColumnType("bigint");
+                        .HasColumnType("uuid");
 
                     b.Property<Instant>("CreatedTime")
                         .HasColumnType("timestamp with time zone");
@@ -94,8 +121,8 @@ namespace FictionArchive.Service.NovelService.Migrations
                     b.Property<Instant>("LastUpdatedTime")
                         .HasColumnType("timestamp with time zone");
 
-                    b.Property<long>("NameId")
+                    b.Property<Guid>("NameId")
-                        .HasColumnType("bigint");
+                        .HasColumnType("uuid");
 
                     b.Property<long?>("NovelId")
                         .HasColumnType("bigint");
@@ -134,8 +161,8 @@ namespace FictionArchive.Service.NovelService.Migrations
                     b.Property<Instant>("CreatedTime")
                         .HasColumnType("timestamp with time zone");
 
-                    b.Property<long>("DescriptionId")
+                    b.Property<Guid>("DescriptionId")
-                        .HasColumnType("bigint");
+                        .HasColumnType("uuid");
 
                     b.Property<string>("ExternalId")
                         .IsRequired()
@@ -144,8 +171,8 @@ namespace FictionArchive.Service.NovelService.Migrations
                     b.Property<Instant>("LastUpdatedTime")
                         .HasColumnType("timestamp with time zone");
 
-                    b.Property<long>("NameId")
+                    b.Property<Guid>("NameId")
-                        .HasColumnType("bigint");
+                        .HasColumnType("uuid");
 
                     b.Property<int>("RawLanguage")
                         .HasColumnType("integer");
@@ -187,8 +214,8 @@ namespace FictionArchive.Service.NovelService.Migrations
                     b.Property<Instant>("CreatedTime")
                         .HasColumnType("timestamp with time zone");
 
-                    b.Property<long>("DisplayNameId")
+                    b.Property<Guid>("DisplayNameId")
-                        .HasColumnType("bigint");
+                        .HasColumnType("uuid");
 
                     b.Property<string>("Key")
                         .IsRequired()
@@ -229,12 +256,13 @@ namespace FictionArchive.Service.NovelService.Migrations
                     b.Property<Instant>("LastUpdatedTime")
                         .HasColumnType("timestamp with time zone");
 
-                    b.Property<string>("Name")
+                    b.Property<Guid>("NameId")
-                        .IsRequired()
+                        .HasColumnType("uuid");
-                        .HasColumnType("text");
 
                     b.HasKey("Id");
 
+                    b.HasIndex("NameId");
+
                     b.ToTable("Person");
                 });
 
@@ -280,10 +308,6 @@ namespace FictionArchive.Service.NovelService.Migrations
                     b.Property<Instant>("CreatedTime")
                         .HasColumnType("timestamp with time zone");
 
-                    b.Property<string>("DisplayName")
-                        .IsRequired()
-                        .HasColumnType("text");
-
                     b.Property<string>("Key")
                         .IsRequired()
                         .HasColumnType("text");
@@ -311,6 +335,25 @@ namespace FictionArchive.Service.NovelService.Migrations
                     b.ToTable("NovelNovelTag");
                 });
 
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Localization.LocalizationRequest", b =>
+                {
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Novels.TranslationEngine", "Engine")
+                        .WithMany()
+                        .HasForeignKey("EngineId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Localization.LocalizationKey", "KeyRequestedForTranslation")
+                        .WithMany()
+                        .HasForeignKey("KeyRequestedForTranslationId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Engine");
+
+                    b.Navigation("KeyRequestedForTranslation");
+                });
+
             modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Localization.LocalizationText", b =>
                 {
                     b.HasOne("FictionArchive.Service.NovelService.Models.Localization.LocalizationKey", null)
@@ -399,6 +442,17 @@ namespace FictionArchive.Service.NovelService.Migrations
                     b.Navigation("Source");
                 });
 
+            modelBuilder.Entity("FictionArchive.Service.NovelService.Models.Novels.Person", b =>
+                {
+                    b.HasOne("FictionArchive.Service.NovelService.Models.Localization.LocalizationKey", "Name")
+                        .WithMany()
+                        .HasForeignKey("NameId")
+                        .OnDelete(DeleteBehavior.Cascade)
+                        .IsRequired();
+
+                    b.Navigation("Name");
+                });
+
             modelBuilder.Entity("NovelNovelTag", b =>
                 {
                     b.HasOne("FictionArchive.Service.NovelService.Models.Novels.Novel", null)

FictionArchive.Service.NovelService/Models/IntegrationEvents/ChapterPullRequestedEvent.cs

@@ -0,0 +1,9 @@
+using FictionArchive.Service.Shared.Services.EventBus;
+
+namespace FictionArchive.Service.NovelService.Models.IntegrationEvents;
+
+public class ChapterPullRequestedEvent : IntegrationEvent
+{
+    public uint NovelId { get; set; }
+    public uint ChapterNumber { get; set; }
+}

FictionArchive.Service.NovelService/Models/IntegrationEvents/NovelUpdateRequestedEvent.cs

@@ -0,0 +1,8 @@
+using FictionArchive.Service.Shared.Services.EventBus;
+
+namespace FictionArchive.Service.NovelService.Models.IntegrationEvents;
+
+public class NovelUpdateRequestedEvent : IntegrationEvent
+{
+    public string NovelUrl { get; set; }
+}

FictionArchive.Service.NovelService/Models/IntegrationEvents/TranslationRequestCompletedEvent.cs

@@ -0,0 +1,17 @@
+using FictionArchive.Common.Enums;
+using FictionArchive.Service.Shared.Services.EventBus;
+
+namespace FictionArchive.Service.NovelService.Models.IntegrationEvents;
+
+public class TranslationRequestCompletedEvent : IntegrationEvent
+{
+    /// <summary>
+    /// Maps this event back to a triggering request.
+    /// </summary>
+    public Guid? TranslationRequestId { get; set; }
+    
+    /// <summary>
+    /// The resulting text.
+    /// </summary>
+    public string? TranslatedText { get; set; }
+}

FictionArchive.Service.NovelService/Models/IntegrationEvents/TranslationRequestCreatedEvent.cs

@@ -0,0 +1,13 @@
+using FictionArchive.Common.Enums;
+using FictionArchive.Service.Shared.Services.EventBus;
+
+namespace FictionArchive.Service.NovelService.Models.IntegrationEvents;
+
+public class TranslationRequestCreatedEvent : IntegrationEvent
+{
+    public Guid TranslationRequestId { get; set; }
+    public Language From { get; set; }
+    public Language To { get; set; }
+    public string Body { get; set; }
+    public string TranslationEngineKey { get; set; }
+}

FictionArchive.Service.NovelService/Models/Localization/LocalizationKey.cs

@@ -5,7 +5,7 @@ using Microsoft.EntityFrameworkCore;
 
 namespace FictionArchive.Service.NovelService.Models.Localization;
 
-public class LocalizationKey : BaseEntity<uint>
+public class LocalizationKey : BaseEntity<Guid>
 {
     public List<LocalizationText> Texts { get; set; }
 

FictionArchive.Service.NovelService/Models/Localization/LocalizationRequest.cs

@@ -0,0 +1,12 @@
+using FictionArchive.Common.Enums;
+using FictionArchive.Service.NovelService.Models.Novels;
+using FictionArchive.Service.Shared.Models;
+
+namespace FictionArchive.Service.NovelService.Models.Localization;
+
+public class LocalizationRequest : BaseEntity<Guid>
+{
+    public LocalizationKey KeyRequestedForTranslation { get; set; }
+    public Language TranslateTo { get; set; }
+    public TranslationEngine Engine { get; set; }
+}

FictionArchive.Service.NovelService/Models/Localization/LocalizationText.cs

@@ -4,7 +4,7 @@ using FictionArchive.Service.Shared.Models;
 
 namespace FictionArchive.Service.NovelService.Models.Localization;
 
-public class LocalizationText : BaseEntity<uint>
+public class LocalizationText : BaseEntity<Guid>
 {
     public Language Language { get; set; }
     public string Text { get; set; }

FictionArchive.Service.NovelService/Models/Novels/TranslationEngine.cs

@@ -5,5 +5,4 @@ namespace FictionArchive.Service.NovelService.Models.Novels;
 public class TranslationEngine : BaseEntity<uint>
 {
     public string Key { get; set; }
-    public string DisplayName { get; set; }
 }

FictionArchive.Service.NovelService/Program.cs

@@ -1,8 +1,11 @@
 using FictionArchive.Service.NovelService.GraphQL;
+using FictionArchive.Service.NovelService.Models.IntegrationEvents;
 using FictionArchive.Service.NovelService.Services;
+using FictionArchive.Service.NovelService.Services.EventHandlers;
 using FictionArchive.Service.NovelService.Services.SourceAdapters;
 using FictionArchive.Service.NovelService.Services.SourceAdapters.Novelpia;
 using FictionArchive.Service.Shared.Extensions;
+using FictionArchive.Service.Shared.Services.EventBus.Implementations;
 using FictionArchive.Service.Shared.Services.GraphQL;
 using Microsoft.EntityFrameworkCore;
 
@@ -16,6 +19,18 @@ public class Program
         
         builder.Services.AddMemoryCache();
         
+        #region Event Bus
+
+        builder.Services.AddRabbitMQ(opt =>
+        {
+            builder.Configuration.GetSection("RabbitMQ").Bind(opt);
+        })
+            .Subscribe<TranslationRequestCompletedEvent, TranslationRequestCompletedEventHandler>()
+            .Subscribe<NovelUpdateRequestedEvent, NovelUpdateRequestedEventHandler>()
+            .Subscribe<ChapterPullRequestedEvent, ChapterPullRequestedEventHandler>();
+        
+        #endregion
+        
         #region GraphQL
 
         builder.Services.AddDefaultGraphQl<Query, Mutation>();
@@ -40,6 +55,8 @@ public class Program
                 client.BaseAddress = new Uri("https://novelpia.com");
             })
             .AddHttpMessageHandler<NovelpiaAuthMessageHandler>();
+
+        builder.Services.AddTransient<NovelUpdateService>();
         
         #endregion
         

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;
+    }
+}

FictionArchive.Service.NovelService/appsettings.json

@@ -12,5 +12,9 @@
   "ConnectionStrings": {
     "DefaultConnection": "Host=localhost;Database=FictionArchive_NovelService;Username=postgres;password=postgres"
   },
+  "RabbitMQ": {
+    "ConnectionString": "amqp://localhost",
+    "ClientIdentifier": "NovelService"
+  },
   "AllowedHosts": "*"
 }

FictionArchive.Service.Shared/FictionArchive.Service.Shared.csproj

@@ -22,6 +22,8 @@
             <PrivateAssets>all</PrivateAssets>
             <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
         </PackageReference>
+        <PackageReference Include="Newtonsoft.Json" Version="13.0.3" />
+        <PackageReference Include="NodaTime.Serialization.JsonNet" Version="3.2.0" />
         <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL" Version="9.0.4" />
         <PackageReference Include="Npgsql.EntityFrameworkCore.PostgreSQL.NodaTime" Version="9.0.4" />
         <PackageReference Include="RabbitMQ.Client" Version="7.2.0" />
@@ -30,9 +32,5 @@
     <ItemGroup>
       <ProjectReference Include="..\FictionArchive.Common\FictionArchive.Common.csproj" />
     </ItemGroup>
-    
-    <ItemGroup>
-      <Folder Include="Services\Messaging\Interfaces\" />
-    </ItemGroup>
 
 </Project>

FictionArchive.Service.Shared/Models/BaseEntity.cs

@@ -5,7 +5,7 @@ namespace FictionArchive.Service.Shared.Models;
 
 public abstract class BaseEntity<TKey> : IAuditable
 {
-    public uint Id { get; set; }
+    public TKey Id { get; set; }
     public Instant CreatedTime { get; set; }
     public Instant LastUpdatedTime { get; set; }
 }

FictionArchive.Service.Shared/Services/EventBus/EventBusBuilder.cs

@@ -0,0 +1,25 @@
+using Microsoft.Extensions.DependencyInjection;
+
+namespace FictionArchive.Service.Shared.Services.EventBus;
+
+public class EventBusBuilder<TEventBus> where TEventBus : class, IEventBus
+{
+    private readonly IServiceCollection _services;
+    private readonly SubscriptionManager _subscriptionManager;
+
+    public EventBusBuilder(IServiceCollection services)
+    {
+        _services = services;
+        _services.AddSingleton<IEventBus, TEventBus>();
+        
+        _subscriptionManager = new SubscriptionManager();
+        _services.AddSingleton<SubscriptionManager>(_subscriptionManager);
+    }
+
+    public EventBusBuilder<TEventBus> Subscribe<TEvent, TEventHandler>() where TEvent : IntegrationEvent where TEventHandler : class, IIntegrationEventHandler<TEvent>
+    {
+        _services.AddKeyedTransient<IIntegrationEventHandler, TEventHandler>(typeof(TEvent).Name);
+        _subscriptionManager.RegisterSubscription<TEvent>();
+        return this;
+    }
+}

FictionArchive.Service.Shared/Services/EventBus/EventBusExtensions.cs

@@ -0,0 +1,12 @@
+using Microsoft.Extensions.DependencyInjection;
+
+namespace FictionArchive.Service.Shared.Services.EventBus;
+
+public static class EventBusExtensions
+{
+    public static EventBusBuilder<TEventBus> AddEventBus<TEventBus>(this IServiceCollection services)
+        where TEventBus : class, IEventBus
+    {
+        return new EventBusBuilder<TEventBus>(services);
+    }
+}

FictionArchive.Service.Shared/Services/EventBus/IEventBus.cs

@@ -0,0 +1,6 @@
+namespace FictionArchive.Service.Shared.Services.EventBus;
+
+public interface IEventBus
+{
+    Task Publish<TEvent>(TEvent integrationEvent) where TEvent : IntegrationEvent;
+}

FictionArchive.Service.Shared/Services/EventBus/IIntegrationEventHandler.cs

@@ -0,0 +1,12 @@
+namespace FictionArchive.Service.Shared.Services.EventBus;
+
+public interface IIntegrationEventHandler<in TEvent> : IIntegrationEventHandler where TEvent : IntegrationEvent
+{
+    Task Handle(TEvent @event);
+    Task IIntegrationEventHandler.Handle(IntegrationEvent @event) => Handle((TEvent)@event);
+}
+
+public interface IIntegrationEventHandler
+{
+    Task Handle(IntegrationEvent @event);
+}

FictionArchive.Service.Shared/Services/EventBus/Implementations/RabbitMQConnectionProvider.cs

@@ -0,0 +1,35 @@
+using RabbitMQ.Client;
+
+namespace FictionArchive.Service.Shared.Services.EventBus.Implementations;
+
+public class RabbitMQConnectionProvider
+{
+    private readonly IConnectionFactory _connectionFactory;
+
+    private IConnection Connection { get; set; }
+    private IChannel DefaultChannel { get; set; }
+
+    public RabbitMQConnectionProvider(IConnectionFactory connectionFactory)
+    {
+        _connectionFactory = connectionFactory;
+    }
+
+    public async Task<IConnection> GetConnectionAsync()
+    {
+        if (Connection == null)
+        {
+            Connection = await _connectionFactory.CreateConnectionAsync();
+        }
+
+        return Connection;
+    }
+    
+    public async Task<IChannel> GetDefaultChannelAsync()
+    {
+        if (DefaultChannel == null)
+        {
+            DefaultChannel = await (await GetConnectionAsync()).CreateChannelAsync();
+        }
+        return DefaultChannel;
+    }
+}

FictionArchive.Service.Shared/Services/EventBus/Implementations/RabbitMQEventBus.cs

@@ -0,0 +1,124 @@
+using System.Text;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Options;
+using Newtonsoft.Json;
+using NodaTime;
+using NodaTime.Serialization.JsonNet;
+using RabbitMQ.Client;
+using RabbitMQ.Client.Events;
+
+namespace FictionArchive.Service.Shared.Services.EventBus.Implementations;
+
+public class RabbitMQEventBus : IEventBus, IHostedService
+{
+    private readonly IServiceScopeFactory _serviceScopeFactory;
+    private readonly RabbitMQConnectionProvider _connectionProvider;
+    private readonly RabbitMQOptions _options;
+    private readonly SubscriptionManager _subscriptionManager;
+    private readonly ILogger<RabbitMQEventBus> _logger;
+    
+    private readonly JsonSerializerSettings _jsonSerializerSettings;
+
+    private const string ExchangeName = "fiction-archive-event-bus";
+
+    public RabbitMQEventBus(IServiceScopeFactory serviceScopeFactory, RabbitMQConnectionProvider connectionProvider, IOptions<RabbitMQOptions> options, SubscriptionManager subscriptionManager, ILogger<RabbitMQEventBus> logger)
+    {
+        _serviceScopeFactory = serviceScopeFactory;
+        _connectionProvider = connectionProvider;
+        _subscriptionManager = subscriptionManager;
+        _logger = logger;
+        _options = options.Value;
+        _jsonSerializerSettings = new JsonSerializerSettings().ConfigureForNodaTime(DateTimeZoneProviders.Tzdb);
+    }
+
+    public async Task Publish<TEvent>(TEvent integrationEvent) where TEvent : IntegrationEvent
+    {
+        var routingKey = typeof(TEvent).Name;
+        var channel = await _connectionProvider.GetDefaultChannelAsync();
+        
+        // Set integration event values
+        integrationEvent.CreatedAt = Instant.FromDateTimeUtc(DateTime.UtcNow);
+        integrationEvent.EventId = Guid.NewGuid();
+        
+        var body = Encoding.UTF8.GetBytes(JsonConvert.SerializeObject(integrationEvent));
+        await channel.BasicPublishAsync(ExchangeName, routingKey, true, body);
+        _logger.LogInformation("Published event {EventName}", routingKey);
+    }
+
+    public async Task StartAsync(CancellationToken cancellationToken)
+    {
+        _ = Task.Factory.StartNew(async () =>
+        {
+            try
+            {
+                var channel = await _connectionProvider.GetDefaultChannelAsync();
+                await channel.ExchangeDeclareAsync(ExchangeName, ExchangeType.Direct,
+                    cancellationToken: cancellationToken);
+
+                await channel.QueueDeclareAsync(_options.ClientIdentifier, true, false, false,
+                    cancellationToken: cancellationToken);
+                var consumer = new AsyncEventingBasicConsumer(channel);
+                consumer.ReceivedAsync += (sender, @event) =>
+                {
+                    return OnReceivedEvent(sender, @event, channel);
+                };
+                
+                foreach (var subscription in _subscriptionManager.Subscriptions)
+                {
+                    await channel.QueueBindAsync(_options.ClientIdentifier, ExchangeName, subscription.Key,
+                        cancellationToken: cancellationToken);
+                    _logger.LogInformation("Subscribed to {SubscriptionKey}", subscription.Key);
+                }
+                
+                await channel.BasicConsumeAsync(_options.ClientIdentifier, false, consumer, cancellationToken: cancellationToken);
+
+                _logger.LogInformation("RabbitMQ EventBus started.");
+            }
+            catch (Exception e)
+            {
+                _logger.LogError(e, "An error occurred while starting the RabbitMQ EventBus");
+            }
+        }, cancellationToken);
+    }
+
+    public Task StopAsync(CancellationToken cancellationToken)
+    {
+        return Task.CompletedTask;
+    }
+    
+    private async Task OnReceivedEvent(object sender, BasicDeliverEventArgs @event, IChannel channel)
+    {
+        var eventName = @event.RoutingKey;
+        _logger.LogInformation("Received event {EventName}", eventName);
+        try
+        {
+            if (!_subscriptionManager.Subscriptions.ContainsKey(eventName))
+            {
+                _logger.LogWarning("Received event without subscription entry.");
+                return;
+            }
+            
+            var eventBody = Encoding.UTF8.GetString(@event.Body.Span);
+            var eventObject = JsonConvert.DeserializeObject(eventBody, _subscriptionManager.Subscriptions[eventName], _jsonSerializerSettings) as IntegrationEvent;
+            
+            using var scope = _serviceScopeFactory.CreateScope();
+
+            foreach (var service in scope.ServiceProvider.GetKeyedServices<IIntegrationEventHandler>(eventName))
+            {
+                await service.Handle(eventObject);
+            }
+            _logger.LogInformation("Finished handling event with name {EventName}", eventName);
+        }
+        catch (Exception e)
+        {
+            _logger.LogError(e, "An error occurred while handling an event.");
+        }
+        finally
+        {
+            await channel.BasicAckAsync(@event.DeliveryTag, false);
+        }
+
+    }
+}

FictionArchive.Service.Shared/Services/EventBus/Implementations/RabbitMQExtensions.cs

@@ -0,0 +1,24 @@
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Options;
+using RabbitMQ.Client;
+
+namespace FictionArchive.Service.Shared.Services.EventBus.Implementations;
+
+public static class RabbitMQExtensions
+{
+    public static EventBusBuilder<RabbitMQEventBus> AddRabbitMQ(this IServiceCollection services, Action<RabbitMQOptions> configure)
+    {
+        services.Configure(configure);
+        services.AddSingleton<IConnectionFactory, ConnectionFactory>(provider =>
+        {
+            var options = provider.GetService<IOptions<RabbitMQOptions>>();
+            ConnectionFactory factory = new ConnectionFactory();
+            factory.Uri = new Uri(options.Value.ConnectionString);
+            return factory;
+        });
+        services.AddSingleton<RabbitMQConnectionProvider>();
+        services.AddHostedService<RabbitMQEventBus>();
+        return services.AddEventBus<RabbitMQEventBus>();
+    }
+}

FictionArchive.Service.Shared/Services/EventBus/Implementations/RabbitMQOptions.cs

@@ -0,0 +1,7 @@
+namespace FictionArchive.Service.Shared.Services.EventBus.Implementations;
+
+public class RabbitMQOptions
+{
+    public string ConnectionString { get; set; }
+    public string ClientIdentifier { get; set; }
+}

FictionArchive.Service.Shared/Services/EventBus/IntegrationEvent.cs

@@ -0,0 +1,9 @@
+using NodaTime;
+
+namespace FictionArchive.Service.Shared.Services.EventBus;
+
+public abstract class IntegrationEvent
+{
+    public Guid EventId { get; set; }
+    public Instant CreatedAt { get; set; }
+}

FictionArchive.Service.Shared/Services/EventBus/SubscriptionManager.cs

@@ -0,0 +1,11 @@
+namespace FictionArchive.Service.Shared.Services.EventBus;
+
+public class SubscriptionManager
+{
+    public Dictionary<string, Type> Subscriptions { get; } = new Dictionary<string, Type>();
+
+    public void RegisterSubscription<TEvent>()
+    {
+        Subscriptions.Add(typeof(TEvent).Name, typeof(TEvent));
+    }
+}

FictionArchive.Service.TranslationService/GraphQL/Mutation.cs

@@ -1,6 +1,8 @@
 using FictionArchive.Common.Enums;
+using FictionArchive.Service.TranslationService.Models;
 using FictionArchive.Service.TranslationService.Models.Database;
 using FictionArchive.Service.TranslationService.Models.Enums;
+using FictionArchive.Service.TranslationService.Services;
 using FictionArchive.Service.TranslationService.Services.Database;
 using FictionArchive.Service.TranslationService.Services.TranslationEngines;
 
@@ -8,23 +10,10 @@ namespace FictionArchive.Service.TranslationService.GraphQL;
 
 public class Mutation
 {
-    public async Task<string> TranslateText(string text, Language from, Language to, string translationEngineKey, IEnumerable<ITranslationEngine> translationEngines, TranslationServiceDbContext dbContext)
+    public async Task<TranslationResult> TranslateText(string text, Language from, Language to, string translationEngineKey, TranslationEngineService translationEngineService)
     {
-        var engine = translationEngines.FirstOrDefault(engine => engine.Descriptor.Key == translationEngineKey);
+        var result = await translationEngineService.Translate(from, to, text, translationEngineKey);
-        var translation = await engine.GetTranslation(text, from, to);
-
-        dbContext.TranslationRequests.Add(new TranslationRequest()
-        {
-            OriginalText = text,
-            BilledCharacterCount = 0, // FILL ME
-            From = from,
-            To = to,
-            Status = translation != null ? TranslationRequestStatus.Success : TranslationRequestStatus.Failed,
-            TranslatedText = translation,
-            TranslationEngineKey = translationEngineKey
-        });
-        await dbContext.SaveChangesAsync();
         
-        return translation;
+        return result;
     }
 }

FictionArchive.Service.TranslationService/Models/IntegrationEvents/TranslationRequestCompletedEvent.cs

@@ -0,0 +1,18 @@
+using FictionArchive.Common.Enums;
+using FictionArchive.Service.Shared.Services.EventBus;
+using FictionArchive.Service.TranslationService.Models.Enums;
+
+namespace FictionArchive.Service.TranslationService.Models.IntegrationEvents;
+
+public class TranslationRequestCompletedEvent : IntegrationEvent
+{
+    /// <summary>
+    /// Maps this event back to a triggering request.
+    /// </summary>
+    public Guid? TranslationRequestId { get; set; }
+    
+    /// <summary>
+    /// The resulting text.
+    /// </summary>
+    public string? TranslatedText { get; set; }
+}

FictionArchive.Service.TranslationService/Models/IntegrationEvents/TranslationRequestCreatedEvent.cs

@@ -0,0 +1,13 @@
+using FictionArchive.Common.Enums;
+using FictionArchive.Service.Shared.Services.EventBus;
+
+namespace FictionArchive.Service.TranslationService.Models.IntegrationEvents;
+
+public class TranslationRequestCreatedEvent : IntegrationEvent
+{
+    public Guid TranslationRequestId { get; set; }
+    public Language From { get; set; }
+    public Language To { get; set; }
+    public string Body { get; set; }
+    public string TranslationEngineKey { get; set; }
+}

FictionArchive.Service.TranslationService/Models/TranslationResult.cs

@@ -0,0 +1,15 @@
+using FictionArchive.Common.Enums;
+using FictionArchive.Service.TranslationService.Models.Enums;
+
+namespace FictionArchive.Service.TranslationService.Models;
+
+public class TranslationResult
+{
+    public required string OriginalText { get; set; }
+    public string? TranslatedText { get; set; }
+    public Language From { get; set; }
+    public Language To { get; set; }
+    public required string TranslationEngineKey { get; set; }
+    public TranslationRequestStatus Status { get; set; }
+    public uint BilledCharacterCount { get; set; }
+}

FictionArchive.Service.TranslationService/Program.cs

@@ -1,11 +1,16 @@
 using DeepL;
 using FictionArchive.Common.Extensions;
 using FictionArchive.Service.Shared.Extensions;
+using FictionArchive.Service.Shared.Services.EventBus.Implementations;
 using FictionArchive.Service.Shared.Services.GraphQL;
 using FictionArchive.Service.TranslationService.GraphQL;
+using FictionArchive.Service.TranslationService.Models.IntegrationEvents;
+using FictionArchive.Service.TranslationService.Services;
 using FictionArchive.Service.TranslationService.Services.Database;
+using FictionArchive.Service.TranslationService.Services.EventHandlers;
 using FictionArchive.Service.TranslationService.Services.TranslationEngines;
 using FictionArchive.Service.TranslationService.Services.TranslationEngines.DeepLTranslate;
+using RabbitMQ.Client;
 
 namespace FictionArchive.Service.TranslationService;
 
@@ -18,6 +23,17 @@ public class Program
 
         builder.Services.AddHealthChecks();
         
+        #region Event Bus
+
+        builder.Services.AddRabbitMQ(opt =>
+        {
+            builder.Configuration.GetSection("RabbitMQ").Bind(opt);
+        })
+        .Subscribe<TranslationRequestCreatedEvent, TranslationRequestCreatedEventHandler>();
+        
+        #endregion
+        
+        
         #region Database
         
         builder.Services.RegisterDbContext<TranslationServiceDbContext>(builder.Configuration.GetConnectionString("DefaultConnection"));
@@ -37,6 +53,8 @@ public class Program
             return new DeepLClient(builder.Configuration["DeepL:ApiKey"]);
         });
         builder.Services.AddTransient<ITranslationEngine, DeepLTranslationEngine>();
+
+        builder.Services.AddTransient<TranslationEngineService>();
         
         #endregion
 

FictionArchive.Service.TranslationService/Services/EventHandlers/TranslationRequestCreatedEventHandler.cs

@@ -0,0 +1,31 @@
+using FictionArchive.Service.Shared.Services.EventBus;
+using FictionArchive.Service.TranslationService.Models.Enums;
+using FictionArchive.Service.TranslationService.Models.IntegrationEvents;
+
+namespace FictionArchive.Service.TranslationService.Services.EventHandlers;
+
+public class TranslationRequestCreatedEventHandler : IIntegrationEventHandler<TranslationRequestCreatedEvent>
+{
+    private readonly ILogger<TranslationRequestCreatedEventHandler> _logger;
+    private readonly TranslationEngineService _translationEngineService;
+    private readonly IEventBus _eventBus;
+
+    public TranslationRequestCreatedEventHandler(ILogger<TranslationRequestCreatedEventHandler> logger, TranslationEngineService translationEngineService)
+    {
+        _logger = logger;
+        _translationEngineService = translationEngineService;
+    }
+
+    public async Task Handle(TranslationRequestCreatedEvent @event)
+    {
+        var result = await _translationEngineService.Translate(@event.From, @event.To, @event.Body, @event.TranslationEngineKey);
+        if (result.Status == TranslationRequestStatus.Success)
+        {
+            await _eventBus.Publish(new TranslationRequestCompletedEvent()
+            {
+                TranslatedText = result.TranslatedText,
+                TranslationRequestId = @event.TranslationRequestId,
+            });
+        }
+    }
+}

FictionArchive.Service.TranslationService/Services/TranslationEngineService.cs

@@ -0,0 +1,47 @@
+using System.Text;
+using FictionArchive.Common.Enums;
+using FictionArchive.Service.Shared.Services.EventBus;
+using FictionArchive.Service.Shared.Services.EventBus.Implementations;
+using FictionArchive.Service.TranslationService.Models;
+using FictionArchive.Service.TranslationService.Models.Database;
+using FictionArchive.Service.TranslationService.Models.Enums;
+using FictionArchive.Service.TranslationService.Models.IntegrationEvents;
+using FictionArchive.Service.TranslationService.Services.Database;
+using FictionArchive.Service.TranslationService.Services.TranslationEngines;
+using RabbitMQ.Client;
+
+namespace FictionArchive.Service.TranslationService.Services;
+
+public class TranslationEngineService
+{
+    private readonly IEnumerable<ITranslationEngine> _translationEngines;
+    private readonly IEventBus _eventBus;
+    private readonly TranslationServiceDbContext _dbContext;
+
+    public TranslationEngineService(IEnumerable<ITranslationEngine> translationEngines, TranslationServiceDbContext dbContext, IEventBus eventBus)
+    {
+        _translationEngines = translationEngines;
+        _dbContext = dbContext;
+        _eventBus = eventBus;
+    }
+
+    public async Task<TranslationResult> Translate(Language from, Language to, string text, string translationEngineKey)
+    {
+        var engine = _translationEngines.FirstOrDefault(engine => engine.Descriptor.Key == translationEngineKey);
+        var translation = await engine.GetTranslation(text, from, to);
+
+        _dbContext.TranslationRequests.Add(new TranslationRequest()
+        {
+            OriginalText = text,
+            BilledCharacterCount = translation.BilledCharacterCount, // FILL ME
+            From = from,
+            To = to,
+            Status = translation != null ? TranslationRequestStatus.Success : TranslationRequestStatus.Failed,
+            TranslatedText = translation.TranslatedText,
+            TranslationEngineKey = translationEngineKey
+        });
+        await _dbContext.SaveChangesAsync();
+        
+        return translation;
+    }
+}

FictionArchive.Service.TranslationService/Services/TranslationEngines/DeepLTranslate/DeepLTranslationEngine.cs

@@ -1,6 +1,7 @@
 using DeepL;
 using DeepL.Model;
 using FictionArchive.Service.TranslationService.Models;
+using FictionArchive.Service.TranslationService.Models.Enums;
 using Language = FictionArchive.Common.Enums.Language;
 
 namespace FictionArchive.Service.TranslationService.Services.TranslationEngines.DeepLTranslate;
@@ -31,11 +32,20 @@ public class DeepLTranslationEngine : ITranslationEngine
         }
     }
 
-    public async Task<string?> GetTranslation(string body, Language from, Language to)
+    public async Task<TranslationResult> GetTranslation(string body, Language from, Language to)
     {
         TextResult translationResult = await _deepLClient.TranslateTextAsync(body, GetLanguageCode(from), GetLanguageCode(to));
         _logger.LogInformation("Translated text. Usage statistics: CHARACTERS BILLED {TranslationResultBilledCharacters}", translationResult.BilledCharacters);
-        return translationResult.Text;
+        return new TranslationResult()
+        {
+            OriginalText = body,
+            From = from,
+            To = to,
+            TranslationEngineKey = Key,
+            BilledCharacterCount = (uint)translationResult.BilledCharacters,
+            Status = TranslationRequestStatus.Success,
+            TranslatedText = translationResult.Text
+        };
     }
 
     private string GetLanguageCode(Language language)

FictionArchive.Service.TranslationService/Services/TranslationEngines/ITranslationEngine.cs

@@ -6,5 +6,5 @@ namespace FictionArchive.Service.TranslationService.Services.TranslationEngines;
 public interface ITranslationEngine
 {
     public TranslationEngineDescriptor Descriptor { get; }
-    public Task<string?> GetTranslation(string body, Language from, Language to);
+    public Task<TranslationResult> GetTranslation(string body, Language from, Language to);
 }

FictionArchive.Service.TranslationService/appsettings.json

@@ -11,5 +11,9 @@
   "ConnectionStrings": {
     "DefaultConnection": "Host=localhost;Database=FictionArchive_NovelService;Username=postgres;password=postgres"
   },
+  "RabbitMQ": {
+    "ConnectionString": "amqp://localhost",
+    "ClientIdentifier": "TranslationService"
+  },
   "AllowedHosts": "*"
 }