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LanguageServer.cs
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LanguageServer.cs
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using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Reactive.Linq;
using System.Reactive.Subjects;
using System.Reactive.Threading.Tasks;
using System.Reflection;
using System.Threading;
using System.Threading.Tasks;
using OmniSharp.Extensions.Embedded.MediatR;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection.Extensions;
using Microsoft.Extensions.Logging;
using Newtonsoft.Json.Linq;
using OmniSharp.Extensions.JsonRpc;
using OmniSharp.Extensions.LanguageServer.Protocol;
using OmniSharp.Extensions.LanguageServer.Protocol.Client.Capabilities;
using OmniSharp.Extensions.LanguageServer.Protocol.Models;
using OmniSharp.Extensions.LanguageServer.Protocol.Serialization;
using OmniSharp.Extensions.LanguageServer.Protocol.Server;
using OmniSharp.Extensions.LanguageServer.Protocol.Server.Capabilities;
using OmniSharp.Extensions.LanguageServer.Server.Abstractions;
using OmniSharp.Extensions.LanguageServer.Server.Handlers;
using OmniSharp.Extensions.LanguageServer.Server.Matchers;
using OmniSharp.Extensions.LanguageServer.Server.Pipelines;
using ISerializer = OmniSharp.Extensions.LanguageServer.Protocol.Serialization.ISerializer;
namespace OmniSharp.Extensions.LanguageServer.Server
{
public class LanguageServer : ILanguageServer, IInitializeHandler, IInitializedHandler, IAwaitableTermination
{
private readonly Connection _connection;
private readonly ILspRequestRouter _requestRouter;
private readonly ShutdownHandler _shutdownHandler = new ShutdownHandler();
private readonly ExitHandler _exitHandler;
private ClientVersion? _clientVersion;
private readonly ILspReciever _reciever;
private readonly ISerializer _serializer;
private readonly IHandlerCollection _collection;
private readonly IEnumerable<InitializeDelegate> _initializeDelegates;
private readonly IEnumerable<InitializedDelegate> _initializedDelegates;
private readonly IResponseRouter _responseRouter;
private readonly ISubject<InitializeResult> _initializeComplete = new AsyncSubject<InitializeResult>();
private readonly CompositeDisposable _disposable = new CompositeDisposable();
private readonly IServiceProvider _serviceProvider;
private SupportedCapabilities _supportedCapabilities;
public static Task<ILanguageServer> From(Action<LanguageServerOptions> optionsAction)
{
var options = new LanguageServerOptions();
optionsAction(options);
return From(options);
}
public static async Task<ILanguageServer> From(LanguageServerOptions options)
{
var server = new LanguageServer(
options.Input,
options.Output,
options.Reciever,
options.RequestProcessIdentifier,
options.LoggerFactory,
options.Serializer,
options.Services,
options.HandlerTypes.Select(x => x.Assembly)
.Distinct().Concat(options.HandlerAssemblies),
options.InitializeDelegates,
options.InitializedDelegates
);
if (options.AddDefaultLoggingProvider)
options.LoggerFactory.AddProvider(new LanguageServerLoggerProvider(server));
await server.Initialize();
return server;
}
internal LanguageServer(
Stream input,
Stream output,
ILspReciever reciever,
IRequestProcessIdentifier requestProcessIdentifier,
ILoggerFactory loggerFactory,
ISerializer serializer,
IServiceCollection services,
IEnumerable<Assembly> assemblies,
IEnumerable<InitializeDelegate> initializeDelegates,
IEnumerable<InitializedDelegate> initializedDelegates)
{
var outputHandler = new OutputHandler(output, serializer);
services.AddLogging();
_reciever = reciever;
_serializer = serializer;
_supportedCapabilities = new SupportedCapabilities();
_collection = new HandlerCollection(_supportedCapabilities);
_initializeDelegates = initializeDelegates;
_initializedDelegates = initializedDelegates;
services.AddSingleton<IOutputHandler>(outputHandler);
services.AddSingleton(_collection);
services.AddSingleton(_serializer);
services.AddSingleton<OmniSharp.Extensions.JsonRpc.ISerializer>(_serializer);
services.AddSingleton(requestProcessIdentifier);
services.AddSingleton<OmniSharp.Extensions.JsonRpc.IReciever>(reciever);
services.AddSingleton<ILspReciever>(reciever);
services.AddSingleton(loggerFactory);
services.AddJsonRpcMediatR(assemblies);
services.AddTransient<IHandlerMatcher, TextDocumentMatcher>();
services.AddSingleton<Protocol.Server.ILanguageServer>(this);
services.AddSingleton<ILanguageServer>(this);
services.AddTransient<IHandlerMatcher, ExecuteCommandMatcher>();
services.AddTransient<IHandlerMatcher, ResolveCommandMatcher>();
services.AddSingleton<ILspRequestRouter, LspRequestRouter>();
services.AddSingleton<IRequestRouter>(_ => _.GetRequiredService<ILspRequestRouter>());
services.AddSingleton<IResponseRouter, ResponseRouter>();
services.AddTransient(typeof(IPipelineBehavior<,>), typeof(ResolveCommandPipeline<,>));
var foundHandlers = services
.Where(x => typeof(IJsonRpcHandler).IsAssignableFrom(x.ServiceType) && x.ServiceType != typeof(IJsonRpcHandler))
.ToArray();
// Handlers are created at the start and maintained as a singleton
foreach (var handler in foundHandlers)
{
services.Remove(handler);
if (handler.ImplementationFactory != null)
services.Add(ServiceDescriptor.Singleton(typeof(IJsonRpcHandler), handler.ImplementationFactory));
else if (handler.ImplementationInstance != null)
services.Add(ServiceDescriptor.Singleton(typeof(IJsonRpcHandler), handler.ImplementationInstance));
else
services.Add(ServiceDescriptor.Singleton(typeof(IJsonRpcHandler), handler.ImplementationType));
}
_serviceProvider = services.BuildServiceProvider();
_requestRouter = _serviceProvider.GetRequiredService<ILspRequestRouter>();
_responseRouter = _serviceProvider.GetRequiredService<IResponseRouter>();
_connection = ActivatorUtilities.CreateInstance<Connection>(_serviceProvider, input);
_exitHandler = new ExitHandler(_shutdownHandler);
_disposable.Add(
AddHandlers(this, _shutdownHandler, _exitHandler, new CancelRequestHandler(_requestRouter))
);
var handlers = _serviceProvider.GetServices<IJsonRpcHandler>().ToArray();
_collection.Add(handlers);
Document = new LanguageServerDocument(_responseRouter);
Client = new LanguageServerClient(_responseRouter);
Window = new LanguageServerWindow(_responseRouter);
Workspace = new LanguageServerWorkspace(_responseRouter);
}
public ILanguageServerDocument Document { get; }
public ILanguageServerClient Client { get; }
public ILanguageServerWindow Window { get; }
public ILanguageServerWorkspace Workspace { get; }
public InitializeParams ClientSettings { get; private set; }
public InitializeResult ServerSettings { get; private set; }
/// <summary>
/// The minimum level for the server's default logger.
/// </summary>
public LogLevel MinimumLogLevel { get; set; }
public IDisposable AddHandler(string method, IJsonRpcHandler handler)
{
var handlerDisposable = _collection.Add(method, handler);
return RegisterHandlers(handlerDisposable);
}
public IDisposable AddHandlers(params IJsonRpcHandler[] handlers)
{
var handlerDisposable = _collection.Add(handlers);
return RegisterHandlers(handlerDisposable);
}
public IDisposable AddHandler(string method, Type handlerType)
{
var handlerDisposable = _collection.Add(method, _serviceProvider, handlerType);
return RegisterHandlers(handlerDisposable);
}
public IDisposable AddHandler<T>()
where T : IJsonRpcHandler
{
return AddHandlers(typeof(T));
}
public IDisposable AddHandlers(params Type[] handlerTypes)
{
var handlerDisposable = _collection.Add(_serviceProvider, handlerTypes);
return RegisterHandlers(handlerDisposable);
}
private IDisposable RegisterHandlers(LspHandlerDescriptorDisposable handlerDisposable)
{
using (var scope = _serviceProvider.CreateScope())
{
var registrations = handlerDisposable.Descriptors
.Select(x => x.Registration)
.Where(x => x != null)
.ToArray();
// Fire and forget
DynamicallyRegisterHandlers(registrations).ToObservable().Subscribe();
return new ImmutableDisposable(
handlerDisposable,
new Disposable(() =>
{
Client.UnregisterCapability(new UnregistrationParams()
{
Unregisterations = registrations.ToArray()
}).ToObservable().Subscribe();
}));
}
}
private async Task Initialize()
{
_connection.Open();
await _initializeComplete;
}
async Task<InitializeResult> IRequestHandler<InitializeParams, InitializeResult>.Handle(InitializeParams request, CancellationToken token)
{
ClientSettings = request;
if (request.Trace == InitializeTrace.Verbose && MinimumLogLevel >= LogLevel.Information)
{
MinimumLogLevel = LogLevel.Trace;
}
await Task.WhenAll(_initializeDelegates.Select(c => c(request)));
_clientVersion = request.Capabilities.GetClientVersion();
_serializer.SetClientCapabilities(_clientVersion.Value, request.Capabilities);
var supportedCapabilites = new List<ISupports>();
if (_clientVersion == ClientVersion.Lsp3)
{
if (request.Capabilities.TextDocument != null)
{
supportedCapabilites.AddRange(
LspHandlerDescriptorHelpers.GetSupportedCapabilities(request.Capabilities.TextDocument)
);
}
if (request.Capabilities.Workspace != null)
{
supportedCapabilites.AddRange(
LspHandlerDescriptorHelpers.GetSupportedCapabilities(request.Capabilities.Workspace)
);
}
}
_supportedCapabilities.Add(supportedCapabilites);
AddHandlers(_serviceProvider.GetServices<IJsonRpcHandler>().ToArray());
var textDocumentCapabilities = ClientSettings.Capabilities.TextDocument;
var workspaceCapabilities = ClientSettings.Capabilities.Workspace;
var ccp = new ClientCapabilityProvider(_collection);
var serverCapabilities = new ServerCapabilities()
{
CodeActionProvider = ccp.GetStaticOptions(textDocumentCapabilities.CodeAction).Get<ICodeActionOptions, CodeActionOptions>(CodeActionOptions.Of),
CodeLensProvider = ccp.GetStaticOptions(textDocumentCapabilities.CodeLens).Get<ICodeLensOptions, CodeLensOptions>(CodeLensOptions.Of),
CompletionProvider = ccp.GetStaticOptions(textDocumentCapabilities.Completion).Get<ICompletionOptions, CompletionOptions>(CompletionOptions.Of),
DefinitionProvider = ccp.HasStaticHandler(textDocumentCapabilities.Definition),
DocumentFormattingProvider = ccp.HasStaticHandler(textDocumentCapabilities.Formatting),
DocumentHighlightProvider = ccp.HasStaticHandler(textDocumentCapabilities.DocumentHighlight),
DocumentLinkProvider = ccp.GetStaticOptions(textDocumentCapabilities.DocumentLink).Get<IDocumentLinkOptions, DocumentLinkOptions>(DocumentLinkOptions.Of),
DocumentOnTypeFormattingProvider = ccp.GetStaticOptions(textDocumentCapabilities.OnTypeFormatting).Get<IDocumentOnTypeFormattingOptions, DocumentOnTypeFormattingOptions>(DocumentOnTypeFormattingOptions.Of),
DocumentRangeFormattingProvider = ccp.HasStaticHandler(textDocumentCapabilities.RangeFormatting),
DocumentSymbolProvider = ccp.HasStaticHandler(textDocumentCapabilities.DocumentSymbol),
ExecuteCommandProvider = ccp.GetStaticOptions(workspaceCapabilities.ExecuteCommand).Reduce<IExecuteCommandOptions, ExecuteCommandOptions>(ExecuteCommandOptions.Of),
HoverProvider = ccp.HasStaticHandler(textDocumentCapabilities.Hover),
ReferencesProvider = ccp.HasStaticHandler(textDocumentCapabilities.References),
RenameProvider = ccp.GetStaticOptions(textDocumentCapabilities.Rename).Get<IRenameOptions, RenameOptions>(RenameOptions.Of),
SignatureHelpProvider = ccp.GetStaticOptions(textDocumentCapabilities.SignatureHelp).Get<ISignatureHelpOptions, SignatureHelpOptions>(SignatureHelpOptions.Of),
WorkspaceSymbolProvider = ccp.HasStaticHandler(workspaceCapabilities.Symbol),
ImplementationProvider = ccp.GetStaticOptions(textDocumentCapabilities.Implementation).Get<IImplementationOptions, ImplementationOptions>(ImplementationOptions.Of),
TypeDefinitionProvider = ccp.GetStaticOptions(textDocumentCapabilities.TypeDefinition).Get<ITypeDefinitionOptions, TypeDefinitionOptions>(TypeDefinitionOptions.Of),
ColorProvider = ccp.GetStaticOptions(textDocumentCapabilities.ColorProvider).Get<IColorOptions, ColorOptions>(ColorOptions.Of),
FoldingRangeProvider = ccp.GetStaticOptions(textDocumentCapabilities.FoldingRangeProvider).Get<IFoldingRangeOptions, FoldingRangeOptions>(FoldingRangeOptions.Of),
};
if (_collection.ContainsHandler(typeof(IDidChangeWorkspaceFoldersHandler)))
{
serverCapabilities.Workspace = new WorkspaceServerCapabilities()
{
WorkspaceFolders = new WorkspaceFolderOptions()
{
Supported = true,
ChangeNotifications = Guid.NewGuid().ToString()
}
};
}
var textDocumentSyncKind = _collection.ContainsHandler(typeof(IDidChangeTextDocumentHandler))
? _collection
.Select(x => x.Handler)
.OfType<IDidChangeTextDocumentHandler>()
.Where(x => x.Change != TextDocumentSyncKind.None)
.Min(z => z.Change)
: TextDocumentSyncKind.None;
if (_clientVersion == ClientVersion.Lsp2)
{
serverCapabilities.TextDocumentSync = textDocumentSyncKind;
}
else
{
serverCapabilities.TextDocumentSync = new TextDocumentSyncOptions()
{
Change = textDocumentSyncKind,
OpenClose = _collection.ContainsHandler(typeof(IDidOpenTextDocumentHandler)) || _collection.ContainsHandler(typeof(IDidCloseTextDocumentHandler)),
Save = _collection.ContainsHandler(typeof(IDidSaveTextDocumentHandler)) ?
new SaveOptions() { IncludeText = true /* TODO: Make configurable */ } :
null,
WillSave = _collection.ContainsHandler(typeof(IWillSaveTextDocumentHandler)),
WillSaveWaitUntil = _collection.ContainsHandler(typeof(IWillSaveWaitUntilTextDocumentHandler))
};
}
// TODO: Need a call back here
// serverCapabilities.Experimental;
_reciever.Initialized();
var result = ServerSettings = new InitializeResult() { Capabilities = serverCapabilities };
await Task.WhenAll(_initializedDelegates.Select(c => c(request, result)));
// TODO:
if (_clientVersion == ClientVersion.Lsp2)
{
// Small delay to let client respond
await Task.Delay(100, token);
_initializeComplete.OnNext(result);
_initializeComplete.OnCompleted();
}
return result;
}
public async Task<Unit> Handle(InitializedParams @params, CancellationToken token)
{
if (_clientVersion == ClientVersion.Lsp3)
{
// Small delay to let client respond
await Task.Delay(100, token);
_initializeComplete.OnNext(ServerSettings);
_initializeComplete.OnCompleted();
}
return Unit.Value;
}
private async Task DynamicallyRegisterHandlers(Registration[] registrations)
{
if (registrations.Length == 0)
return; // No dynamic registrations supported by client.
var @params = new RegistrationParams() { Registrations = registrations };
await _initializeComplete;
await Client.RegisterCapability(@params);
}
public IObservable<bool> Shutdown => _shutdownHandler.Shutdown;
public IObservable<int> Exit => _exitHandler.Exit;
public void SendNotification(string method)
{
_responseRouter.SendNotification(method);
}
public void SendNotification<T>(string method, T @params)
{
_responseRouter.SendNotification(method, @params);
}
public Task<TResponse> SendRequest<T, TResponse>(string method, T @params)
{
return _responseRouter.SendRequest<T, TResponse>(method, @params);
}
public Task<TResponse> SendRequest<TResponse>(string method)
{
return _responseRouter.SendRequest<TResponse>(method);
}
public Task SendRequest<T>(string method, T @params)
{
return _responseRouter.SendRequest(method, @params);
}
public TaskCompletionSource<JToken> GetRequest(long id)
{
return _responseRouter.GetRequest(id);
}
public Task WasShutDown => _shutdownHandler.WasShutDown;
public Task WaitForExit => _exitHandler.WaitForExit;
public void Dispose()
{
_connection?.Dispose();
_disposable?.Dispose();
}
public IDictionary<string, JToken> Experimental { get; } = new Dictionary<string, JToken>();
}
}