Add logging

src/Jackett/Utils/WebAPIToNLogTracer.cs

@@ -0,0 +1,53 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Net.Http;
+using System.Text;
+using System.Threading.Tasks;
+using System.Web.Http.Tracing;
+
+namespace Jackett.Utils
+{
+    public class WebAPIToNLogTracer : ITraceWriter
+    {
+        public void Trace(HttpRequestMessage request, string category, TraceLevel level,
+            Action<TraceRecord> traceAction)
+        {
+            if (Engine.TracingEnabled)
+            {
+                TraceRecord rec = new TraceRecord(request, category, level);
+                traceAction(rec);
+                WriteTrace(rec);
+            }
+        }
+
+        protected void WriteTrace(TraceRecord rec)
+        {
+            var message = string.Format("{0} {1} {2}", rec.Operator, rec.Operation, rec.Message);
+            switch (rec.Level)
+            {
+                case TraceLevel.Debug:
+                    Engine.Logger.Debug(message);
+                    break;
+                case TraceLevel.Error:
+                    Engine.Logger.Error(message);
+                    break;
+                case TraceLevel.Fatal:
+                    Engine.Logger.Fatal(message);
+                    break;
+                case TraceLevel.Info:
+                    Engine.Logger.Info(message);
+                    break;
+                case TraceLevel.Off:
+                    // Do nothing?
+                    break;
+                case TraceLevel.Warn:
+                    Engine.Logger.Warn(message);
+                    break;
+               
+            }
+         
+            System.Diagnostics.Trace.WriteLine(message, rec.Category);
+        }
+    }
+}