Move logging to separate class to prevent allocation per generic type (#31345)

Author: andrzejpindor

src/Servers/HttpSys/src/RequestProcessing/RequestContextLog.cs

@@ -0,0 +1,35 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+
+using System;
+using Microsoft.Extensions.Logging;
+
+namespace Microsoft.AspNetCore.Server.HttpSys
+{
+    internal static class RequestContextLog
+    {
+        private static readonly Action<ILogger, Exception?> _requestError =
+            LoggerMessage.Define(LogLevel.Error, LoggerEventIds.RequestError, "ProcessRequestAsync");
+
+        private static readonly Action<ILogger, Exception?> _requestProcessError =
+            LoggerMessage.Define(LogLevel.Error, LoggerEventIds.RequestProcessError, "ProcessRequestAsync");
+
+        private static readonly Action<ILogger, Exception?> _requestsDrained =
+            LoggerMessage.Define(LogLevel.Information, LoggerEventIds.RequestsDrained, "All requests drained.");
+
+        public static void RequestError(ILogger logger, Exception exception)
+        {
+            _requestError(logger, exception);
+        }
+
+        public static void RequestProcessError(ILogger logger, Exception exception)
+        {
+            _requestProcessError(logger, exception);
+        }
+
+        public static void RequestsDrained(ILogger logger)
+        {
+            _requestsDrained(logger, null);
+        }
+    }
+}

src/Servers/HttpSys/src/RequestProcessing/RequestContextOfT.Log.cs

@@ -51,7 +51,7 @@ protected override async Task ExecuteAsync()
                 }
                 catch (Exception ex)
                 {
-                    Log.RequestProcessError(Logger, ex);
+                    RequestContextLog.RequestProcessError(Logger, ex);
                     if (context != null)
                     {
                         application.DisposeContext(context, ex);
@@ -85,14 +85,14 @@ protected override async Task ExecuteAsync()
                 {
                     if (messagePump.DecrementOutstandingRequest() == 0 && messagePump.Stopping)
                     {
-                        Log.RequestsDrained(Logger);
+                        RequestContextLog.RequestsDrained(Logger);
                         messagePump.SetShutdownSignal();
                     }
                 }
             }
             catch (Exception ex)
             {
-                Log.RequestError(Logger, ex);
+                RequestContextLog.RequestError(Logger, ex);
                 Abort();
             }
         }