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// 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.Collections.Generic;
using System.Collections.Immutable;
using System.IO;
using System.Threading;
using System.Threading.Tasks;
using Microsoft.CodeAnalysis.Editor.Shared.Utilities;
using Microsoft.CodeAnalysis.Host;
using Microsoft.CodeAnalysis.Host.Mef;
using Microsoft.CodeAnalysis.LanguageServer;
using Microsoft.CodeAnalysis.LanguageServer.Handler;
using Microsoft.CodeAnalysis.Options;
using Microsoft.CommonLanguageServerProtocol.Framework;
using Microsoft.VisualStudio.Composition;
using Microsoft.VisualStudio.LanguageServer.Client;
using Microsoft.VisualStudio.LanguageServer.Protocol;
using Microsoft.VisualStudio.Threading;
using Nerdbank.Streams;
using StreamJsonRpc;
namespace Microsoft.CodeAnalysis.Editor.Implementation.LanguageClient
{
internal abstract partial class AbstractInProcLanguageClient : ILanguageClient, ILanguageServerFactory, ICapabilitiesProvider, ILanguageClientCustomMessage2
{
private readonly IThreadingContext _threadingContext;
private readonly ILanguageClientMiddleLayer? _middleLayer;
private readonly ILspServiceLoggerFactory _lspLoggerFactory;
private readonly ExportProvider _exportProvider;
protected readonly AbstractLspServiceProvider LspServiceProvider;
protected readonly IGlobalOptionService GlobalOptions;
/// <summary>
/// Created when <see cref="ActivateAsync"/> is called.
/// </summary>
private AbstractLanguageServer<RequestContext>? _languageServer;
/// <summary>
/// Gets the name of the language client (displayed to the user).
/// </summary>
public string Name => ServerKind.ToUserVisibleString();
/// <summary>
/// Gets the optional middle layer object that can intercept outgoing requests and responses.
/// </summary>
/// <remarks>
/// Currently utilized by Razor to intercept Roslyn's workspace/semanticTokens/refresh requests.
/// </remarks>
public object? MiddleLayer => _middleLayer;
/// <summary>
/// Unused, implementing <see cref="ILanguageClientCustomMessage2"/>.
/// Gets the optional target object for receiving custom messages not covered by the language server protocol.
/// </summary>
public object? CustomMessageTarget => null;
/// <summary>
/// An enum representing this server instance.
/// </summary>
public abstract WellKnownLspServerKinds ServerKind { get; }
/// <summary>
/// The set of languages that this LSP server supports and can return results for.
/// </summary>
protected abstract ImmutableArray<string> SupportedLanguages { get; }
/// <summary>
/// Unused, implementing <see cref="ILanguageClient"/>
/// No additional settings are provided for this server, so we do not need any configuration section names.
/// </summary>
public IEnumerable<string>? ConfigurationSections { get; }
/// <summary>
/// Gets the initialization options object the client wants to send when 'initialize' message is sent.
/// See https://microsoft.github.io/language-server-protocol/specifications/specification-3-14/#initialize
/// We do not provide any additional initialization options.
/// </summary>
public object? InitializationOptions { get; }
/// <summary>
/// Gets a value indicating whether a notification bubble show be shown when the language server fails to initialize.
/// </summary>
public abstract bool ShowNotificationOnInitializeFailed { get; }
/// <summary>
/// Unused, implementing <see cref="ILanguageClient"/>
/// Files that we care about are already provided and watched by the workspace.
/// </summary>
public IEnumerable<string>? FilesToWatch { get; }
public event AsyncEventHandler<EventArgs>? StartAsync;
/// <summary>
/// Unused, implementing <see cref="ILanguageClient"/>
/// </summary>
public event AsyncEventHandler<EventArgs>? StopAsync { add { } remove { } }
public AbstractInProcLanguageClient(
AbstractLspServiceProvider lspServiceProvider,
IGlobalOptionService globalOptions,
ILspServiceLoggerFactory lspLoggerFactory,
IThreadingContext threadingContext,
ExportProvider exportProvider,
AbstractLanguageClientMiddleLayer? middleLayer = null)
{
LspServiceProvider = lspServiceProvider;
GlobalOptions = globalOptions;
_lspLoggerFactory = lspLoggerFactory;
_threadingContext = threadingContext;
_exportProvider = exportProvider;
_middleLayer = middleLayer;
}
public async Task<Connection?> ActivateAsync(CancellationToken cancellationToken)
{
// HACK HACK HACK: prevent potential crashes/state corruption during load. Fixes
// https://devdiv.visualstudio.com/DevDiv/_workitems/edit/1261421
//
// When we create an LSP server, we compute our server capabilities; this may depend on
// reading things like workspace options which will force us to initialize our option persisters.
// Unfortunately some of our option persisters currently assert they are first created on the UI
// thread. If the first time they're created is because of LSP initialization, we might end up loading
// them on a background thread which will throw exceptions and then prevent them from being created
// again later.
//
// The correct fix for this is to fix the threading violations in the option persister code;
// asserting a MEF component is constructed on the foreground thread is never allowed, but alas it's
// done there. Fixing that isn't difficult but comes with some risk I don't want to take for 16.9;
// instead we'll just compute our capabilities here on the UI thread to ensure everything is loaded.
// We _could_ consider doing a SwitchToMainThreadAsync in InProcLanguageServer.InitializeAsync
// (where the problematic call to GetCapabilites is), but that call is invoked across the StreamJsonRpc
// link where it's unclear if VS Threading rules apply. By doing this here, we are dong it in a
// VS API that is following VS Threading rules, and it also ensures that the preereqs are loaded
// prior to any RPC calls being made.
//
// https://github.com/dotnet/roslyn/issues/29602 will track removing this hack
// since that's the primary offending persister that needs to be addressed.
// To help mitigate some of the issues with this hack we first allow implementors to do some work
// so they can do MEF part loading before the UI thread switch. This doesn't help with the options
// persisters, but at least doesn't make it worse.
Activate_OffUIThread();
// Now switch and do the problematic GetCapabilities call
await _threadingContext.JoinableTaskFactory.SwitchToMainThreadAsync(cancellationToken);
_ = GetCapabilities(new VSInternalClientCapabilities { SupportsVisualStudioExtensions = true });
if (_languageServer is not null)
{
await _languageServer.WaitForExitAsync().WithCancellation(cancellationToken).ConfigureAwait(false);
}
var (clientStream, serverStream) = FullDuplexStream.CreatePair();
_languageServer = await CreateAsync<RequestContext>(
this,
serverStream,
serverStream,
ServerKind,
_lspLoggerFactory,
cancellationToken).ConfigureAwait(false);
return new Connection(clientStream, clientStream);
}
protected virtual void Activate_OffUIThread()
{
}
/// <summary>
/// Signals that the extension has been loaded. The server can be started immediately, or wait for user action to start.
/// To start the server, invoke the <see cref="StartAsync"/> event;
/// </summary>
public async Task OnLoadedAsync()
{
await StartAsync.InvokeAsync(this, EventArgs.Empty).ConfigureAwait(false);
}
/// <summary>
/// Signals the extension that the language server has been successfully initialized.
/// </summary>
/// <returns>A <see cref="Task"/> which completes when actions that need to be performed when the server is ready are done.</returns>
public Task OnServerInitializedAsync()
{
// We don't have any tasks that need to be triggered after the server has successfully initialized.
return Task.CompletedTask;
}
internal async Task<AbstractLanguageServer<RequestContext>> CreateAsync<TRequestContext>(
AbstractInProcLanguageClient languageClient,
Stream inputStream,
Stream outputStream,
WellKnownLspServerKinds serverKind,
ILspServiceLoggerFactory lspLoggerFactory,
CancellationToken cancellationToken)
{
var jsonMessageFormatter = new JsonMessageFormatter();
VSInternalExtensionUtilities.AddVSInternalExtensionConverters(jsonMessageFormatter.JsonSerializer);
var jsonRpc = new JsonRpc(new HeaderDelimitedMessageHandler(outputStream, inputStream, jsonMessageFormatter))
{
ExceptionStrategy = ExceptionProcessing.ISerializable,
};
var serverTypeName = languageClient.GetType().Name;
var logger = await lspLoggerFactory.CreateLoggerAsync(serverTypeName, jsonRpc, cancellationToken).ConfigureAwait(false);
var hostServices = VisualStudioMefHostServices.Create(_exportProvider);
var server = Create(
jsonRpc,
languageClient,
serverKind,
logger,
hostServices);
jsonRpc.StartListening();
return server;
}
public virtual AbstractLanguageServer<RequestContext> Create(
JsonRpc jsonRpc,
ICapabilitiesProvider capabilitiesProvider,
WellKnownLspServerKinds serverKind,
ILspServiceLogger logger,
HostServices hostServices)
{
var server = new RoslynLanguageServer(
LspServiceProvider,
jsonRpc,
capabilitiesProvider,
logger,
hostServices,
SupportedLanguages,
serverKind);
return server;
}
public abstract ServerCapabilities GetCapabilities(ClientCapabilities clientCapabilities);
public Task<InitializationFailureContext?> OnServerInitializeFailedAsync(ILanguageClientInitializationInfo initializationState)
{
var initializationFailureContext = new InitializationFailureContext();
initializationFailureContext.FailureMessage = string.Format(EditorFeaturesResources.Language_client_initialization_failed,
Name, initializationState.StatusMessage, initializationState.InitializationException?.ToString());
return Task.FromResult<InitializationFailureContext?>(initializationFailureContext);
}
/// <summary>
/// Unused, implementing <see cref="ILanguageClientCustomMessage2"/>.
/// This method is called after the language server has been activated, but connection has not been established.
/// </summary>
public Task AttachForCustomMessageAsync(JsonRpc rpc) => Task.CompletedTask;
}
}
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