Add WebAPIExceptionHandler

src/Jackett/Jackett.csproj

@@ -345,6 +345,7 @@
     <Compile Include="Utils\WebAPIRequestLogger.cs" />
     <Compile Include="Utils\WebAPIToNLogTracer.cs" />
     <Compile Include="Utils\Clients\HttpWebClient.cs" />
+    <Compile Include="WebAPIExceptionHandler.cs" />
     <Compile Include="WebAPIExceptionLogger.cs" />
     <Compile Include="Indexers\BakaBT.cs" />
   </ItemGroup>

src/Jackett/Startup.cs

@@ -16,6 +16,7 @@ using Jackett.Services;
 using System.Web.Http.Tracing;
 using Jackett.Utils;
 using Microsoft.AspNet.Identity;
+using System.Web.Http.ExceptionHandling;
 
 [assembly: OwinStartup(typeof(Startup))]
 namespace Jackett
@@ -77,6 +78,9 @@ namespace Jackett
 
             appBuilder.Use<WebApiRootRedirectMiddleware>();
 
+            // register exception handler
+            config.Services.Replace(typeof(IExceptionHandler), new WebAPIExceptionHandler());
+
             // Setup tracing if enabled
             if (TracingEnabled)
             {

src/Jackett/WebAPIExceptionHandler.cs

@@ -0,0 +1,60 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using System.Web.Http.ExceptionHandling;
+using Jackett.Utils;
+using System.Net.Http;
+using System.Net;
+using System.Web.Http;
+using System.Net.Sockets;
+
+namespace Jackett
+{
+    class WebAPIExceptionHandler : IExceptionHandler
+    {
+        public virtual Task HandleAsync(ExceptionHandlerContext context,
+                                   CancellationToken cancellationToken)
+        {
+            if (!ShouldHandle(context))
+            {
+                return Task.FromResult(0);
+            }
+
+            return HandleAsyncCore(context, cancellationToken);
+        }
+
+        public virtual Task HandleAsyncCore(ExceptionHandlerContext context,
+                                           CancellationToken cancellationToken)
+        {
+            HandleCore(context);
+            return Task.FromResult(0);
+        }
+
+        public virtual void HandleCore(ExceptionHandlerContext context)
+        {
+            // attempt to fix #930
+            if (context.Exception is SocketException)
+            {
+                Engine.Logger.Error("Ignoring unhandled SocketException: " + context.Exception.GetExceptionDetails());
+                return;
+            }
+
+            Engine.Logger.Error("HandleCore(): unhandled exception: " + context.Exception.GetExceptionDetails());
+
+            var resp = new HttpResponseMessage(HttpStatusCode.InternalServerError)
+            {
+                Content = new StringContent(context.Exception.Message),
+                ReasonPhrase = "Jackett_InternalServerError"
+            };
+            throw new HttpResponseException(resp);
+        }
+
+        public virtual bool ShouldHandle(ExceptionHandlerContext context)
+        {
+            return context.ExceptionContext.CatchBlock.IsTopLevel;
+        }
+    }
+}