Use implicit logging scope for Activity

src/DefaultBuilder/src/WebHost.cs

@@ -189,12 +189,18 @@ public static IWebHostBuilder CreateDefaultBuilder(string[] args)
                     config.AddCommandLine(args);
                 }
             })
-            .ConfigureLogging((hostingContext, logging) =>
+            .ConfigureLogging((hostingContext, loggingBuilder) =>
             {
-                logging.AddConfiguration(hostingContext.Configuration.GetSection("Logging"));
-                logging.AddConsole();
-                logging.AddDebug();
-                logging.AddEventSourceLogger();
+                loggingBuilder.Configure(options =>
+                {
+                    options.ActivityTrackingOptions = ActivityTrackingOptions.SpanId
+                                                        | ActivityTrackingOptions.TraceId
+                                                        | ActivityTrackingOptions.ParentId;
+                });
+                loggingBuilder.AddConfiguration(hostingContext.Configuration.GetSection("Logging"));
+                loggingBuilder.AddConsole();
+                loggingBuilder.AddDebug();
+                loggingBuilder.AddEventSourceLogger();
             }).
             UseDefaultServiceProvider((context, options) =>
             {

src/Hosting/Hosting/src/Internal/HostingApplicationDiagnostics.cs

@@ -69,7 +69,7 @@ public void BeginRequest(HttpContext httpContext, HostingApplication.Context con
                 // Scope may be relevant for a different level of logging, so we always create it
                 // see: https://github.com/aspnet/Hosting/pull/944
                 // Scope can be null if logging is not on.
-                context.Scope = _logger.RequestScope(httpContext, context.Activity);
+                context.Scope = _logger.RequestScope(httpContext);
 
                 if (_logger.IsEnabled(LogLevel.Information))
                 {

src/Hosting/Hosting/src/Internal/HostingLoggerExtensions.cs

@@ -4,7 +4,6 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
-using System.Diagnostics;
 using System.Globalization;
 using System.Reflection;
 using Microsoft.AspNetCore.Http;
@@ -14,9 +13,9 @@ namespace Microsoft.AspNetCore.Hosting
 {
     internal static class HostingLoggerExtensions
     {
-        public static IDisposable RequestScope(this ILogger logger, HttpContext httpContext, Activity activity)
+        public static IDisposable RequestScope(this ILogger logger, HttpContext httpContext)
         {
-            return logger.BeginScope(new HostingLogScope(httpContext, activity));
+            return logger.BeginScope(new HostingLogScope(httpContext));
         }
 
         public static void ApplicationError(this ILogger logger, Exception exception)
@@ -97,15 +96,14 @@ private class HostingLogScope : IReadOnlyList<KeyValuePair<string, object>>
         {
             private readonly string _path;
             private readonly string _traceIdentifier;
-            private readonly Activity _activity;
 
             private string _cachedToString;
 
             public int Count
             {
                 get
                 {
-                    return 5;
+                    return 2;
                 }
             }
 
@@ -121,31 +119,17 @@ public KeyValuePair<string, object> this[int index]
                     {
                         return new KeyValuePair<string, object>("RequestPath", _path);
                     }
-                    else if (index == 2)
-                    {
-                        return new KeyValuePair<string, object>("SpanId", _activity.GetSpanId());
-                    }
-                    else if (index == 3)
-                    {
-                        return new KeyValuePair<string, object>("TraceId", _activity.GetTraceId());
-                    }
-                    else if (index == 4)
-                    {
-                        return new KeyValuePair<string, object>("ParentId", _activity.GetParentId());
-                    }
 
                     throw new ArgumentOutOfRangeException(nameof(index));
                 }
             }
 
-            public HostingLogScope(HttpContext httpContext, Activity activity)
+            public HostingLogScope(HttpContext httpContext)
             {
                 _traceIdentifier = httpContext.TraceIdentifier;
                 _path = (httpContext.Request.PathBase.HasValue 
                          ? httpContext.Request.PathBase + httpContext.Request.Path 
                          : httpContext.Request.Path).ToString();
-
-                _activity = activity;
             }
 
             public override string ToString()
@@ -154,12 +138,9 @@ public override string ToString()
                 {
                     _cachedToString = string.Format(
                         CultureInfo.InvariantCulture,
-                        "RequestPath:{0} RequestId:{1}, SpanId:{2}, TraceId:{3}, ParentId:{4}",
+                        "RequestPath:{0} RequestId:{1}",
                         _path,
-                        _traceIdentifier,
-                        _activity.GetSpanId(),
-                        _activity.GetTraceId(),
-                        _activity.GetParentId());
+                        _traceIdentifier);
                 }
 
                 return _cachedToString;

src/Hosting/Hosting/test/HostingApplicationDiagnosticsTests.cs

@@ -40,50 +40,6 @@ public void CreateContextWithDisabledLoggerDoesNotCreateActivity()
             Assert.Null(Activity.Current);
         }
 
-        [Fact]
-        public void CreateContextWithEnabledLoggerCreatesActivityAndSetsActivityInScope()
-        {
-            // Arrange
-            var logger = new LoggerWithScopes(isEnabled: true);
-            var hostingApplication = CreateApplication(out var features, logger: logger);
-
-            // Act
-            var context = hostingApplication.CreateContext(features);
-
-            Assert.Single(logger.Scopes);
-            var pairs = ((IReadOnlyList<KeyValuePair<string, object>>)logger.Scopes[0]).ToDictionary(p => p.Key, p => p.Value);
-            Assert.Equal(Activity.Current.Id, pairs["SpanId"].ToString());
-            Assert.Equal(Activity.Current.RootId, pairs["TraceId"].ToString());
-            Assert.Equal(string.Empty, pairs["ParentId"]?.ToString());
-        }
-
-        [Fact]
-        public void CreateContextWithEnabledLoggerAndRequestIdCreatesActivityAndSetsActivityInScope()
-        {
-            // Arrange
-
-            // Generate an id we can use for the request id header (in the correct format)
-            var activity = new Activity("IncomingRequest");
-            activity.Start();
-            var id = activity.Id;
-            activity.Stop();
-
-            var logger = new LoggerWithScopes(isEnabled: true);
-            var hostingApplication = CreateApplication(out var features, logger: logger, configure: context =>
-            {
-                context.Request.Headers["Request-Id"] = id;
-            });
-
-            // Act
-            var context = hostingApplication.CreateContext(features);
-
-            Assert.Single(logger.Scopes);
-            var pairs = ((IReadOnlyList<KeyValuePair<string, object>>)logger.Scopes[0]).ToDictionary(p => p.Key, p => p.Value);
-            Assert.Equal(Activity.Current.Id, pairs["SpanId"].ToString());
-            Assert.Equal(Activity.Current.RootId, pairs["TraceId"].ToString());
-            Assert.Equal(id, pairs["ParentId"].ToString());
-        }
-
         [Fact]
         public void ActivityStopDoesNotFireIfNoListenerAttachedForStart()
         {