From 90606338fb60b6c5bff3231bb1c2390e3ed48cdd Mon Sep 17 00:00:00 2001
From: BrennanConroy <brecon@microsoft.com>
Date: Thu, 2 Aug 2018 15:21:24 -0700
Subject: [PATCH] Log when closing connection due to timeout (#2722)

---
 .../HubConnectionContext.cs                              | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/src/Microsoft.AspNetCore.SignalR.Core/HubConnectionContext.cs b/src/Microsoft.AspNetCore.SignalR.Core/HubConnectionContext.cs
index a67fa133df..98583d9903 100644
--- a/src/Microsoft.AspNetCore.SignalR.Core/HubConnectionContext.cs
+++ b/src/Microsoft.AspNetCore.SignalR.Core/HubConnectionContext.cs
@@ -502,6 +502,7 @@ namespace Microsoft.AspNetCore.SignalR
             {
                 if (!_receivedMessageThisInterval)
                 {
+                    Log.ClientTimeout(_logger, TimeSpan.FromTicks(_clientTimeoutInterval));
                     Abort();
                 }
 
@@ -560,6 +561,9 @@ namespace Microsoft.AspNetCore.SignalR
             private static readonly Action<ILogger, Exception> _abortFailed =
                 LoggerMessage.Define(LogLevel.Trace, new EventId(8, "AbortFailed"), "Abort callback failed.");
 
+            private static readonly Action<ILogger, int, Exception> _clientTimeout =
+                LoggerMessage.Define<int>(LogLevel.Debug, new EventId(9, "ClientTimeout"), "Client timeout ({ClientTimeout}ms) elapsed without receiving a message from the client. Closing connection.");
+
             public static void HandshakeComplete(ILogger logger, string hubProtocol)
             {
                 _handshakeComplete(logger, hubProtocol, null);
@@ -599,6 +603,11 @@ namespace Microsoft.AspNetCore.SignalR
             {
                 _abortFailed(logger, exception);
             }
+
+            public static void ClientTimeout(ILogger logger, TimeSpan timeout)
+            {
+                _clientTimeout(logger, (int)timeout.TotalMilliseconds, null);
+            }
         }
     }
 }