[FA-misc] Translation engine work

FictionArchive.Service.TranslationService/Services/Resilience/TranslationResiliencePipeline.cs

@@ -0,0 +1,26 @@
+using DeepL;
+using Polly;
+using Polly.Retry;
+
+namespace FictionArchive.Service.TranslationService.Services.Resilience;
+
+public static class TranslationResiliencePipeline
+{
+    public static ResiliencePipeline Build()
+    {
+        return new ResiliencePipelineBuilder()
+            .AddRetry(new RetryStrategyOptions
+            {
+                ShouldHandle = new PredicateBuilder()
+                    .Handle<HttpRequestException>()
+                    .Handle<TaskCanceledException>(ex => ex.InnerException is TimeoutException)
+                    .Handle<ConnectionException>()
+                    .Handle<TooManyRequestsException>(),
+                MaxRetryAttempts = 3,
+                BackoffType = DelayBackoffType.Exponential,
+                Delay = TimeSpan.FromMilliseconds(500),
+                UseJitter = true
+            })
+            .Build();
+    }
+}