Event ids and more logging

src/Microsoft.AspNet.Hosting/Internal/HostingEngine.cs

@@ -89,6 +89,9 @@ namespace Microsoft.AspNet.Hosting.Internal
             var logger = _applicationServices.GetRequiredService<ILogger<HostingEngine>>();
             var contextFactory = _applicationServices.GetRequiredService<IHttpContextFactory>();
             var diagnosticSource = _applicationServices.GetRequiredService<DiagnosticSource>();
+
+            logger.Starting();
+
             var server = ServerFactory.Start(_serverFeatures,
                 async features =>
                 {
@@ -130,9 +133,11 @@ namespace Microsoft.AspNet.Hosting.Internal
                 });
 
             _applicationLifetime.NotifyStarted();
+            logger.Started();
 
             return new Application(ApplicationServices, _serverFeatures, new Disposable(() =>
             {
+                logger.Shutdown();
                 _applicationLifetime.StopApplication();
                 server.Dispose();
                 _applicationLifetime.NotifyStopped();
@@ -218,7 +223,7 @@ namespace Microsoft.AspNet.Hosting.Internal
                 // Write errors to standard out so they can be retrieved when not in development mode.
                 Console.Out.WriteLine("Application startup exception: " + ex.ToString());
                 var logger = _applicationServices.GetRequiredService<ILogger<HostingEngine>>();
-                logger.LogError("Application startup exception", ex);
+                logger.ApplicationError(ex);
 
                 // Generate an HTML error page.
                 var runtimeEnv = _applicationServices.GetRequiredService<IRuntimeEnvironment>();

src/Microsoft.AspNet.Hosting/Internal/HostingLoggerExtensions.cs

@@ -22,7 +22,7 @@ namespace Microsoft.AspNet.Hosting.Internal
             {
                 logger.Log(
                     logLevel: LogLevel.Information,
-                    eventId: 1,
+                    eventId: LoggerEventIds.RequestStarting,
                     state: new HostingRequestStarting(httpContext),
                     exception: null,
                     formatter: HostingRequestStarting.Callback);
@@ -36,7 +36,7 @@ namespace Microsoft.AspNet.Hosting.Internal
                 var elapsed = new TimeSpan(Environment.TickCount - startTimeInTicks);
                 logger.Log(
                     logLevel: LogLevel.Information,
-                    eventId: 2,
+                    eventId: LoggerEventIds.RequestFinished,
                     state: new HostingRequestFinished(httpContext, elapsed),
                     exception: null,
                     formatter: HostingRequestFinished.Callback);
@@ -50,13 +50,51 @@ namespace Microsoft.AspNet.Hosting.Internal
                 var elapsed = new TimeSpan(Environment.TickCount - startTimeInTicks);
                 logger.Log(
                     logLevel: LogLevel.Information,
-                    eventId: 2,
+                    eventId: LoggerEventIds.RequestFailed,
                     state: new HostingRequestFailed(httpContext, elapsed),
                     exception: null,
                     formatter: HostingRequestFailed.Callback);
             }
         }
 
+        public static void ApplicationError(this ILogger logger, Exception exception)
+        {
+            logger.LogError(
+                eventId: LoggerEventIds.ApplicationStartupException,
+                message: "Application startup exception",
+                error: exception);
+        }
+
+        public static void Starting(this ILogger logger)
+        {
+            if (logger.IsEnabled(LogLevel.Verbose))
+            {
+                logger.LogVerbose(
+                   eventId: LoggerEventIds.Starting,
+                   data: "Hosting starting");
+            }
+        }
+
+        public static void Started(this ILogger logger)
+        {
+            if (logger.IsEnabled(LogLevel.Verbose))
+            {
+                logger.LogVerbose(
+                    eventId: LoggerEventIds.Started,
+                    data: "Hosting started");
+            }
+        }
+
+        public static void Shutdown(this ILogger logger)
+        {
+            if (logger.IsEnabled(LogLevel.Verbose))
+            {
+                logger.LogVerbose(
+                    eventId: LoggerEventIds.Shutdown,
+                    data: "Hosting shutdown");
+            }
+        }
+
 
         private class HostingLogScope : ILogValues
         {

src/Microsoft.AspNet.Hosting/Internal/LoggerEventIds.cs

@@ -0,0 +1,16 @@
+// 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.
+
+namespace Microsoft.AspNet.Hosting.Internal
+{
+    internal static class LoggerEventIds
+    {
+        public const int RequestStarting = 1;
+        public const int RequestFinished = 2;
+        public const int RequestFailed = 3;
+        public const int Starting = 4;
+        public const int Started = 5;
+        public const int Shutdown = 6;
+        public const int ApplicationStartupException = 7;
+    }
+}