Fixes #50 - include named scopes

samples/WebSample/Controllers/HomeController.cs

@@ -4,22 +4,40 @@
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Mvc;
 using Serilog;
+using Microsoft.Extensions.Logging;
 
 namespace WebSample.Controllers
 {
     public class HomeController : Controller
     {
+        ILogger<HomeController> _logger;
+
+        public HomeController(ILogger<HomeController> logger)
+        {
+            _logger = logger;
+        }
+
         public IActionResult Index()
         {
-            Log.Information("Hello from the Index!");
+            _logger.LogInformation("Before");
+
+            using (_logger.BeginScope("Some name"))
+            using (_logger.BeginScope(42))
+            using (_logger.BeginScope("Formatted {WithValue}", 12345))
+            using (_logger.BeginScope(new Dictionary<string, object> { ["ViaDictionary"] = 100 }))
+            {
+                _logger.LogInformation("Hello from the Index!");
+            }
 
+            _logger.LogInformation("After");
             return View();
         }
 
         public IActionResult About()
         {
             ViewData["Message"] = "Your application description page.";
 
+            // Directly through Serilog
             Log.Information("This is a handler for {Path}", Request.Path);
 
             return View();

samples/WebSample/appsettings.json

@@ -12,7 +12,8 @@
     ],
     "WriteTo": [
       "Trace",
-      "LiterateConsole"
+      "LiterateConsole",
+      {"Name": "Seq", "Args": {"serverUrl": "http://localhost:5341" }}
     ]
   }
 }

samples/WebSample/project.json

@@ -23,7 +23,8 @@
     "Serilog.Extensions.Logging": { "target": "project" },
     "Serilog.Settings.Configuration": "2.1.0-dev-00028",
     "Serilog.Sinks.Trace": "2.0.0",
-    "Serilog.Sinks.Literate": "2.0.0"
+    "Serilog.Sinks.Literate": "2.0.0",
+    "Serilog.Sinks.Seq": "3.1.1"
   },
 
   "tools": {

src/Serilog.Extensions.Logging/Extensions/Logging/SerilogLoggerProvider.cs

@@ -12,6 +12,8 @@
 using Serilog.Core;
 using Serilog.Events;
 using FrameworkLogger = Microsoft.Extensions.Logging.ILogger;
+using System.Collections.Generic;
+using Serilog.Context;
 
 namespace Serilog.Extensions.Logging
 {
@@ -21,6 +23,7 @@ namespace Serilog.Extensions.Logging
     public class SerilogLoggerProvider : ILoggerProvider, ILogEventEnricher
     {
         internal const string OriginalFormatPropertyName = "{OriginalFormat}";
+        internal const string ScopePropertyName = "Scope";
 
         // May be null; if it is, Log.Logger will be lazily used
         readonly ILogger _logger;
@@ -54,15 +57,36 @@ public FrameworkLogger CreateLogger(string name)
         /// <inheritdoc />
         public IDisposable BeginScope<T>(T state)
         {
-            return new SerilogLoggerScope(this, state);
+            if (CurrentScope != null)
+                return new SerilogLoggerScope(this, state);
+
+            // The outermost scope pushes and pops the Serilog `LogContext` - once
+            // this enricher is on the stack, the `CurrentScope` property takes care
+            // of the rest of the `BeginScope()` stack.
+            var popSerilogContext = LogContext.PushProperties(this);
+            return new SerilogLoggerScope(this, state, popSerilogContext);
         }
 
         /// <inheritdoc />
         public void Enrich(LogEvent logEvent, ILogEventPropertyFactory propertyFactory)
         {
+            List<LogEventPropertyValue> scopeItems = null;
             for (var scope = CurrentScope; scope != null; scope = scope.Parent)
             {
-                scope.Enrich(logEvent, propertyFactory);
+                LogEventPropertyValue scopeItem;
+                scope.EnrichAndCreateScopeItem(logEvent, propertyFactory, out scopeItem);
+
+                if (scopeItem != null)
+                {
+                    scopeItems = scopeItems ?? new List<LogEventPropertyValue>();
+                    scopeItems.Add(scopeItem);
+                }
+            }
+
+            if (scopeItems != null)
+            {
+                scopeItems.Reverse();
+                logEvent.AddPropertyIfAbsent(new LogEventProperty(ScopePropertyName, new SequenceValue(scopeItems)));
             }
         }
 

src/Serilog.Extensions.Logging/Extensions/Logging/SerilogLoggerScope.cs

@@ -3,29 +3,30 @@
 
 using System;
 using System.Collections.Generic;
-using Serilog.Context;
 using Serilog.Core;
 using Serilog.Events;
 
 namespace Serilog.Extensions.Logging
 {
-    class SerilogLoggerScope : IDisposable, ILogEventEnricher
+    class SerilogLoggerScope : IDisposable
     {
+        const string NoName = "None";
+
         readonly SerilogLoggerProvider _provider;
         readonly object _state;
-        readonly IDisposable _popSerilogContext;
+        readonly IDisposable _chainedDisposable;
 
         // An optimization only, no problem if there are data races on this.
         bool _disposed;
 
-        public SerilogLoggerScope(SerilogLoggerProvider provider, object state)
+        public SerilogLoggerScope(SerilogLoggerProvider provider, object state, IDisposable chainedDisposable = null)
         {
             _provider = provider;
             _state = state;
 
             Parent = _provider.CurrentScope;
             _provider.CurrentScope = this;
-            _popSerilogContext = LogContext.PushProperties(this);
+            _chainedDisposable = chainedDisposable;
         }
 
         public SerilogLoggerScope Parent { get; }
@@ -44,19 +45,30 @@ public void Dispose()
                         _provider.CurrentScope = Parent;
                 }
 
-                _popSerilogContext.Dispose();
+                _chainedDisposable?.Dispose();
             }
         }
 
-        public void Enrich(LogEvent logEvent, ILogEventPropertyFactory propertyFactory)
+        public void EnrichAndCreateScopeItem(LogEvent logEvent, ILogEventPropertyFactory propertyFactory, out LogEventPropertyValue scopeItem)
         {
+            if (_state == null)
+            {
+                scopeItem = null;
+                return;
+            }
+
             var stateProperties = _state as IEnumerable<KeyValuePair<string, object>>;
             if (stateProperties != null)
             {
+                scopeItem = null; // Unless it's `FormattedLogValues`, these are treated as property bags rather than scope items.
+
                 foreach (var stateProperty in stateProperties)
                 {
                     if (stateProperty.Key == SerilogLoggerProvider.OriginalFormatPropertyName && stateProperty.Value is string)
+                    {
+                        scopeItem = new ScalarValue(_state.ToString());
                         continue;
+                    }
 
                     var key = stateProperty.Key;
                     var destructureObject = false;
@@ -71,6 +83,10 @@ public void Enrich(LogEvent logEvent, ILogEventPropertyFactory propertyFactory)
                     logEvent.AddPropertyIfAbsent(property);
                 }
             }
+            else
+            {
+                scopeItem = propertyFactory.CreateProperty(NoName, _state).Value;
+            }
         }
     }
 }

src/Serilog.Extensions.Logging/project.json

@@ -21,6 +21,12 @@
     "net4.5": {
       "dependencies": { "System.Runtime": "4.0.0" }
     },
+    "net4.6": {
+      "dependencies": { "System.Runtime": "4.0.20" },
+      "buildOptions": {
+        "define": [ "ASYNCLOCAL" ]
+      }
+    },
     "netstandard1.3": {
       "buildOptions": {
         "define": ["ASYNCLOCAL"]

test/Serilog.Extensions.Logging.Tests/SerilogLoggerTests.cs

@@ -364,6 +364,30 @@ public void BeginScopeDoesNotModifyKeyWhenDestructurerIsNotUsedInDictionary()
             Assert.True(sink.Writes[0].Properties.ContainsKey("FirstName"));
         }
 
+        [Fact]
+        public void NamedScopesAreCaptured()
+        {
+            var t = SetUp(LogLevel.Trace);
+            var logger = t.Item1;
+            var sink = t.Item2;
+
+            using (logger.BeginScope("Outer"))
+            using (logger.BeginScope("Inner"))
+            {
+                logger.Log(LogLevel.Information, 0, TestMessage, null, null);
+            }
+
+            Assert.Equal(1, sink.Writes.Count);
+
+            LogEventPropertyValue scopeValue;
+            Assert.True(sink.Writes[0].Properties.TryGetValue(SerilogLoggerProvider.ScopePropertyName, out scopeValue));
+
+            var items = (scopeValue as SequenceValue)?.Elements.Select(e => ((ScalarValue)e).Value).Cast<string>().ToArray();
+            Assert.Equal(2, items.Length);
+            Assert.Equal("Outer", items[0]);
+            Assert.Equal("Inner", items[1]);
+        }
+
         private class FoodScope : IEnumerable<KeyValuePair<string, object>>
         {
             readonly string _name;