serverside shutdown hook test

src/csharp/Grpc.Core.Tests/Grpc.Core.Tests.csproj

@@ -87,6 +87,7 @@
     <Compile Include="Internal\FakeNativeCall.cs" />
     <Compile Include="Internal\AsyncCallServerTest.cs" />
     <Compile Include="ShutdownHookTest.cs" />
+    <Compile Include="ShutdownHookServerTest.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>

src/csharp/Grpc.Core.Tests/ShutdownHookServerTest.cs

+#region Copyright notice and license
+
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#endregion
+
+using System;
+using System.Diagnostics;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Grpc.Core;
+using Grpc.Core.Internal;
+using Grpc.Core.Utils;
+using NUnit.Framework;
+
+namespace Grpc.Core.Tests
+{
+    public class ShutdownHookServerTest
+    {
+        const string Host = "127.0.0.1";
+
+        /// <summary>
+        /// Make sure that a non-shutdown server can be cleaned up using
+        /// a <c>AppDomain.ProcessExit</c> hook.
+        /// </summary>
+        [Test]
+        public void AppDomainProcessExitHook()
+        {
+            var helper = new MockServiceHelper(Host);
+            var server = helper.GetServer();
+            server.Start();
+            AppDomain.CurrentDomain.ProcessExit += (object sender, EventArgs e) =>
+            {
+                // TODO: expose API for killing all servers
+                // TODO: expose API for closing all channels
+                server.KillAsync();
+                GrpcEnvironment.ReleaseAsync();
+            };
+        }
+
+        // TODO: test what happens if there's a pending completion in the cq (destroy on non-empty cq)
+
+        // TODO: test what happens if there's an appdomain unload 
+
+        // TODO: tests involving a server...
+    }
+}

src/csharp/Grpc.Core.Tests/ShutdownHookTest.cs

@@ -55,16 +55,17 @@ namespace Grpc.Core.Tests
         public void AppDomainProcessExitHook()
         {
             var channel = new Channel(Host, 1000, ChannelCredentials.Insecure);
-            AppDomain.CurrentDomain.DomainUnload += (object sender, EventArgs e) =>
-            {
-                Console.WriteLine("DomainUnload");
-                channel.ShutdownAsync();
-            };
             AppDomain.CurrentDomain.ProcessExit += (object sender, EventArgs e) =>
             {
-                Console.WriteLine("ProcessExit");
+                // TODO: expose API to shutdown all channels.
                 channel.ShutdownAsync();
             };
         }
+
+        // TODO: test what happens if there's a pending completion in the cq (destroy on non-empty cq)
+
+        // TODO: test what happens if there's an appdomain unload 
+
+        // TODO: tests involving a server...
     }
 }

src/csharp/Grpc.Core/Internal/GrpcThreadPool.cs

@@ -128,7 +128,7 @@ namespace Grpc.Core.Internal
             var cq = completionQueues.ElementAt(cqIndex);
 
             var thread = new Thread(new ThreadStart(() => RunHandlerLoop(cq)));
-            thread.IsBackground = false;
+            thread.IsBackground = true;
             thread.Name = string.Format("grpc {0} (cq {1})", threadIndex, cqIndex);
             thread.Start();
 

src/csharp/tests.json

@@ -25,6 +25,7 @@
     "Grpc.Core.Tests.ResponseHeadersTest",
     "Grpc.Core.Tests.SanityTest",
     "Grpc.Core.Tests.ServerTest",
+    "Grpc.Core.Tests.ShutdownHookServerTest",
     "Grpc.Core.Tests.ShutdownHookTest",
     "Grpc.Core.Tests.ShutdownTest",
     "Grpc.Core.Tests.TimeoutsTest",