Update gladstone/roslyn api

src/LanguageServer/Protocol/Handler/Extensions/ExtensionDocumentMessageHandler.cs

@@ -31,13 +31,16 @@ public async Task<ExtensionMessageResponse> HandleRequestAsync(ExtensionDocument
         var solution = context.Document.Project.Solution;
 
         var service = solution.Services.GetRequiredService<IExtensionMessageHandlerService>();
-        var (response, _, exception) = await service.HandleExtensionDocumentMessageAsync(
+        var (response, extensionWasUnloaded, exception) = await service.HandleExtensionDocumentMessageAsync(
             context.Document, request.MessageName, request.Message, cancellationToken).ConfigureAwait(false);
 
         // Report any exceptions the extension itself caused while handling the request.
         if (exception is not null)
             context.Logger.LogException(exception);
 
-        return new ExtensionMessageResponse(response!);
+        return new ExtensionMessageResponse(
+            response,
+            extensionWasUnloaded,
+            ExtensionException.FromException(exception));
     }
 }

src/LanguageServer/Protocol/Handler/Extensions/ExtensionException.cs

@@ -0,0 +1,20 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Text.Json.Serialization;
+
+namespace Microsoft.CodeAnalysis.LanguageServer.Handler.Extensions;
+
+internal sealed record class ExtensionException(
+    [property: JsonPropertyName("typeName")] string TypeName,
+    [property: JsonPropertyName("message")] string Message,
+    [property: JsonPropertyName("stackTrace"), JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)] string? StackTrace,
+    [property: JsonPropertyName("innerException"), JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)] ExtensionException? InnerException)
+{
+    public static ExtensionException? FromException(Exception? exception)
+        => exception is null
+            ? null
+            : new ExtensionException(exception.GetType().ToString(), exception.Message, exception.StackTrace, FromException(exception.InnerException));
+}

src/LanguageServer/Protocol/Handler/Extensions/ExtensionMessageResponse.cs

@@ -9,6 +9,11 @@ namespace Microsoft.CodeAnalysis.LanguageServer.Handler.Extensions;
 /// <summary>
 /// Return type for the roslyn/extensionWorkspaceMessage and roslyn/extensionDocumentMessage request.
 /// </summary>
-/// <param name="Response">Json response returned by the extension message handler.</param>
+/// <param name="Response">Json response returned by the extension message handler. Can be <see langword="null"/> if the
+/// extension was unloaded concurrently with the response being issued, or if the extension threw an exception while
+/// processing.</param>
 internal readonly record struct ExtensionMessageResponse(
-    [property: JsonPropertyName("response")] string Response);
+    [property: JsonPropertyName("response"), JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)] string? Response,
+    [property: JsonPropertyName("extensionWasUnloaded"), JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)] bool ExtensionWasUnloaded,
+    [property: JsonPropertyName("extensionException"), JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+        ExtensionException? ExtensionException);

src/LanguageServer/Protocol/Handler/Extensions/ExtensionRegisterHandler.cs

@@ -34,6 +34,9 @@ public async Task<ExtensionRegisterResponse> HandleRequestAsync(ExtensionRegiste
         if (handlerNames.ExtensionException is not null)
             context.Logger.LogException(handlerNames.ExtensionException);
 
-        return new(handlerNames.WorkspaceMessageHandlers, handlerNames.DocumentMessageHandlers);
+        return new(
+            handlerNames.WorkspaceMessageHandlers,
+            handlerNames.DocumentMessageHandlers,
+            ExtensionException.FromException(handlerNames.ExtensionException));
     }
 }

src/LanguageServer/Protocol/Handler/Extensions/ExtensionRegisterResponse.cs

@@ -12,6 +12,9 @@ namespace Microsoft.CodeAnalysis.LanguageServer.Handler.Extensions;
 /// </summary>
 /// <param name="WorkspaceMessageHandlers">Names of the registered non-document-specific extension message handlers.</param>
 /// <param name="DocumentMessageHandlers">Names of the registered document-specific extension message handlers.</param>
-internal readonly record struct ExtensionRegisterResponse(
+/// <param name="ExtensionException">Details of any exceptions that occurred during extension registration.</param>
+internal sealed record class ExtensionRegisterResponse(
     [property: JsonPropertyName("workspaceMessageHandlers")] ImmutableArray<string> WorkspaceMessageHandlers,
-    [property: JsonPropertyName("documentMessageHandlers")] ImmutableArray<string> DocumentMessageHandlers);
+    [property: JsonPropertyName("documentMessageHandlers")] ImmutableArray<string> DocumentMessageHandlers,
+    [property: JsonPropertyName("extensionException"), JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingNull)]
+        ExtensionException? ExtensionException);

src/LanguageServer/Protocol/Handler/Extensions/ExtensionWorkspaceMessageHandler.cs

@@ -27,13 +27,16 @@ public async Task<ExtensionMessageResponse> HandleRequestAsync(ExtensionWorkspac
         var solution = context.Solution;
 
         var service = solution.Services.GetRequiredService<IExtensionMessageHandlerService>();
-        var (response, _, exception) = await service.HandleExtensionWorkspaceMessageAsync(
+        var (response, extensionWasUnloaded, exception) = await service.HandleExtensionWorkspaceMessageAsync(
             solution, request.MessageName, request.Message, cancellationToken).ConfigureAwait(false);
 
         // Report any exceptions the extension itself caused while handling the request.
         if (exception is not null)
             context.Logger.LogException(exception);
 
-        return new ExtensionMessageResponse(response!);
+        return new ExtensionMessageResponse(
+            response,
+            extensionWasUnloaded,
+            ExtensionException.FromException(exception));
     }
 }