[FA-misc] Translation engine work

FictionArchive.Service.TranslationService/Program.cs

@@ -9,6 +9,10 @@ using FictionArchive.Service.TranslationService.Services;
 using FictionArchive.Service.TranslationService.Services.Database;
 using FictionArchive.Service.TranslationService.Services.TranslationEngines;
 using FictionArchive.Service.TranslationService.Services.TranslationEngines.DeepLTranslate;
+using System.Net.Http.Headers;
+using FictionArchive.Service.TranslationService.Services.Resilience;
+using FictionArchive.Service.TranslationService.Services.TranslationEngines.NanoGpt;
+using Polly;
 
 namespace FictionArchive.Service.TranslationService;
 
@@ -55,12 +59,44 @@ public class Program
         
         #region Translation Adapter
 
-        builder.Services.AddTransient<DeepLClient>(provider =>
-        {
-            return new DeepLClient(builder.Configuration["DeepL:ApiKey"]);
-        });
+        // Shared resilience pipeline used by both DeepL and NanoGPT engines.
+        builder.Services.AddSingleton(TranslationResiliencePipeline.Build());
+
+        // DeepL
+        builder.Services.AddTransient<DeepLClient>(_ => new DeepLClient(builder.Configuration["DeepL:ApiKey"]));
         builder.Services.AddTransient<ITranslationEngine, DeepLTranslationEngine>();
 
+        // NanoGPT — typed HttpClient (bearer auth + base address + 120s timeout).
+        builder.Services.AddHttpClient<NanoGptApiClient>(client =>
+        {
+            var baseAddress = builder.Configuration["NanoGpt:BaseAddress"];
+            if (!string.IsNullOrWhiteSpace(baseAddress))
+            {
+                client.BaseAddress = new Uri(baseAddress);
+            }
+
+            var apiKey = builder.Configuration["NanoGpt:ApiKey"];
+            if (!string.IsNullOrWhiteSpace(apiKey) && apiKey != "REPLACE_ME")
+            {
+                client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", apiKey);
+            }
+
+            client.Timeout = TimeSpan.FromSeconds(120);
+        });
+
+        // Register one ITranslationEngine per configured NanoGPT model.
+        var nanoGptModels = builder.Configuration
+            .GetSection("NanoGpt:Models")
+            .Get<NanoGptModelOptions[]>() ?? [];
+        foreach (var modelOptions in nanoGptModels)
+        {
+            builder.Services.AddTransient<ITranslationEngine>(sp => new NanoGptTranslationEngine(
+                sp.GetRequiredService<NanoGptApiClient>(),
+                modelOptions,
+                sp.GetRequiredService<ResiliencePipeline>(),
+                sp.GetRequiredService<ILogger<NanoGptTranslationEngine>>()));
+        }
+
         builder.Services.AddTransient<TranslationEngineService>();
 
         #endregion