Create ActivityLogLoggerProvider that logs warnings and errors

Author: DustinCampbell

src/Razor/src/Microsoft.VisualStudio.LanguageServices.Razor/Logging/ActivityLogLoggerProvider.Logger.cs

@@ -0,0 +1,49 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System;
+using Microsoft.AspNetCore.Razor.PooledObjects;
+using Microsoft.CodeAnalysis.Razor.Logging;
+using Microsoft.VisualStudio.Razor.Logging;
+
+namespace Microsoft.VisualStudio.LanguageServices.Razor.Logging;
+
+internal sealed partial class ActivityLogLoggerProvider
+{
+    private sealed class Logger(ActivityLog activityLog, string categoryName) : ILogger
+    {
+        private readonly ActivityLog _activityLog = activityLog;
+        private readonly string _categoryName = categoryName;
+
+        public bool IsEnabled(LogLevel logLevel)
+            => logLevel is LogLevel.Warning or LogLevel.Error or LogLevel.Critical;
+
+        public void Log(LogLevel logLevel, string message, Exception? exception)
+        {
+            switch (logLevel)
+            {
+                case LogLevel.Error or LogLevel.Critical:
+                    _activityLog.LogError(GetLogMessage(message, exception));
+                    break;
+
+                case LogLevel.Warning:
+                    _activityLog.LogWarning(GetLogMessage(message, exception));
+                    break;
+            }
+
+            string GetLogMessage(string message, Exception? exception)
+            {
+                using var _ = StringBuilderPool.GetPooledObject(out var builder);
+                builder.Append($"{DateTime.Now:h:mm:ss.fff} [{_categoryName}] {message}");
+
+                if (exception is not null)
+                {
+                    builder.AppendLine();
+                    builder.Append(exception);
+                }
+
+                return builder.ToString();
+            }
+        }
+    }
+}

src/Razor/src/Microsoft.VisualStudio.LanguageServices.Razor/Logging/ActivityLogLoggerProvider.cs

@@ -0,0 +1,21 @@
+// Copyright (c) .NET Foundation. All rights reserved.
+// Licensed under the MIT license. See License.txt in the project root for license information.
+
+using System.ComponentModel.Composition;
+using Microsoft.CodeAnalysis.Razor.Logging;
+using Microsoft.VisualStudio.Razor.Logging;
+
+namespace Microsoft.VisualStudio.LanguageServices.Razor.Logging;
+
+/// <summary>
+/// An <see cref="ILoggerProvider"/> that logs any warnings or errors to the Visual Studio Activity Log.
+/// </summary>
+[Export(typeof(ILoggerProvider))]
+[method: ImportingConstructor]
+internal sealed partial class ActivityLogLoggerProvider(ActivityLog activityLog) : ILoggerProvider
+{
+    private readonly ActivityLog _activityLog = activityLog;
+
+    public ILogger CreateLogger(string categoryName)
+        => new Logger(_activityLog, categoryName);
+}