Added API benchmark, hash device_id, handled null cases in GET/PUT

API.Benchmark/KoreaderHashBenchmark.cs

@@ -0,0 +1,41 @@
+using API.Helpers.Builders;
+using BenchmarkDotNet.Attributes;
+using BenchmarkDotNet.Order;
+using System;
+using API.Entities.Enums;
+
+namespace API.Benchmark
+{
+    [StopOnFirstError]
+    [MemoryDiagnoser]
+    [RankColumn]
+    [Orderer(SummaryOrderPolicy.FastestToSlowest)]
+    [SimpleJob(launchCount: 1, warmupCount: 5, invocationCount: 20)]
+    public class KoreaderHashBenchmark
+    {
+        private const string sourceEpub = "./Data/AesopsFables.epub";
+
+        [Benchmark(Baseline = true)]
+        public void TestBuildManga_baseline()
+        {
+            var file = new MangaFileBuilder(sourceEpub, MangaFormat.Epub)
+                .Build();
+            if (file == null)
+            {
+                throw new Exception("Failed to build manga file");
+            }
+        }
+
+        [Benchmark]
+        public void TestBuildManga_withHash()
+        {
+            var file = new MangaFileBuilder(sourceEpub, MangaFormat.Epub)
+                .WithHash()
+                .Build();
+            if (file == null)
+            {
+                throw new Exception("Failed to build manga file");
+            }
+        }
+    }
+}