qlanguageserver.cpp

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// Copyright (C) 2021 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
 
#include "qlanguageserver_p_p.h"
 
#include <QtLanguageServer/private/qlspnotifysignals_p.h>
#include <QtJsonRpc/private/qjsonrpcprotocol_p_p.h>
 
QT_BEGIN_NAMESPACE
 
using namespace QLspSpecification;
using namespace Qt::StringLiterals;
 
Q_LOGGING_CATEGORY(lspServerLog, "qt.languageserver.server")
 
QLanguageServerPrivate::QLanguageServerPrivate(const QJsonRpcTransport::DataHandler &h)
    : protocol(h)
{
}
 
QLanguageServer::QLanguageServer(const QJsonRpcTransport::DataHandler &h, QObject *parent)
    : QObject(*new QLanguageServerPrivate(h), parent)
{
    Q_D(QLanguageServer);
    registerMethods(*d->protocol.typedRpc());
    d->notifySignals.registerHandlers(&d->protocol);
}
 
QLanguageServerProtocol *QLanguageServer::protocol()
{
    Q_D(QLanguageServer);
    return &d->protocol;
}
 
QLanguageServer::RunStatus QLanguageServer::runStatus() const
{
    const Q_D(QLanguageServer);
    QMutexLocker l(&d->mutex);
    return d->runStatus;
}
 
void QLanguageServer::finishSetup()
{
    Q_D(QLanguageServer);
    RunStatus rStatus;
    {
        QMutexLocker l(&d->mutex);
        rStatus = d->runStatus;
        if (rStatus == RunStatus::NotSetup)
            d->runStatus = RunStatus::SettingUp;
    }
    if (rStatus != RunStatus::NotSetup) {
        emit lifecycleError();
        return;
    }
    emit runStatusChanged(RunStatus::SettingUp);
 
    registerHandlers(&d->protocol);
    for (auto module : d->modules)
        module->registerHandlers(this, &d->protocol);
 
    {
        QMutexLocker l(&d->mutex);
        rStatus = d->runStatus;
        if (rStatus == RunStatus::SettingUp)
            d->runStatus = RunStatus::DidSetup;
    }
    if (rStatus != RunStatus::SettingUp) {
        emit lifecycleError();
        return;
    }
    emit runStatusChanged(RunStatus::DidSetup);
}
 
void QLanguageServer::addServerModule(QLanguageServerModule *serverModule)
{
    Q_D(QLanguageServer);
    Q_ASSERT(serverModule);
    RunStatus rStatus;
    {
        QMutexLocker l(&d->mutex);
        rStatus = d->runStatus;
        if (rStatus == RunStatus::NotSetup) {
            if (d->modules.contains(serverModule->name())) {
                d->modules.insert(serverModule->name(), serverModule);
                qCWarning(lspServerLog) << "Duplicate add of QLanguageServerModule named"
                                        << serverModule->name() << ", overwriting.";
            } else {
                d->modules.insert(serverModule->name(), serverModule);
            }
        }
    }
    if (rStatus != RunStatus::NotSetup) {
        qCWarning(lspServerLog) << "Called QLanguageServer::addServerModule after setup";
        emit lifecycleError();
        return;
    }
}
 
QLanguageServerModule *QLanguageServer::moduleByName(const QString &n) const
{
    const Q_D(QLanguageServer);
    QMutexLocker l(&d->mutex);
    return d->modules.value(n);
}
 
QLspNotifySignals *QLanguageServer::notifySignals()
{
    Q_D(QLanguageServer);
    return &d->notifySignals;
}
 
void QLanguageServer::registerMethods(QJsonRpc::TypedRpc &typedRpc)
{
    typedRpc.installMessagePreprocessor(
            [this](const QJsonDocument &doc, const QJsonParseError &err,
                   const QJsonRpcProtocol::Handler<QJsonRpcProtocol::Response> &responder) {
                Q_D(QLanguageServer);
                if (!doc.isObject()) {
                    qCWarning(lspServerLog)
                            << "non object jsonrpc message" << doc << err.errorString();
                    return QJsonRpcProtocol::Processing::Stop;
                }
                bool sendErrorResponse = false;
                RunStatus rState;
                QJsonValue id = doc.object()[u"id"];
                {
                    QMutexLocker l(&d->mutex);
                    // the normal case is d->runStatus == RunStatus::DidInitialize
                    if (d->runStatus != RunStatus::DidInitialize) {
                        if (d->runStatus == RunStatus::DidSetup && !doc.isNull()
                            && doc.object()[u"method"].toString()
                                    == QString::fromUtf8(
                                            QLspSpecification::Requests::InitializeMethod)) {
                            return QJsonRpcProtocol::Processing::Continue;
                        } else if (!doc.isNull()
                                   && doc.object()[u"method"].toString()
                                           == QString::fromUtf8(
                                                   QLspSpecification::Notifications::ExitMethod)) {
                            return QJsonRpcProtocol::Processing::Continue;
                        }
                        if (id.isString() || id.isDouble()) {
                            sendErrorResponse = true;
                            rState = d->runStatus;
                        } else {
                            return QJsonRpcProtocol::Processing::Stop;
                        }
                    }
                }
                if (!sendErrorResponse) {
                    if (id.isString() || id.isDouble()) {
                        QMutexLocker l(&d->mutex);
                        d->requestsInProgress.insert(id, QRequestInProgress {});
                    }
                    return QJsonRpcProtocol::Processing::Continue;
                }
                if (rState == RunStatus::NotSetup || rState == RunStatus::DidSetup)
                    responder(QJsonRpcProtocol::MessageHandler::error(
                            int(QLspSpecification::ErrorCodes::ServerNotInitialized),
                            u"Request on non initialized Language Server (runStatus %1): %2"_s
                                    .arg(int(rState))
                                    .arg(QString::fromUtf8(doc.toJson()))));
                else
                    responder(QJsonRpcProtocol::MessageHandler::error(
                            int(QLspSpecification::ErrorCodes::InvalidRequest),
                            u"Method called on stopping Language Server (runStatus %1)"_s.arg(
                                    int(rState))));
                return QJsonRpcProtocol::Processing::Stop;
            });
    typedRpc.installOnCloseAction([this](QJsonRpc::TypedResponse::Status,
                                         const QJsonRpc::IdType &id, QJsonRpc::TypedRpc &) {
        Q_D(QLanguageServer);
        QJsonValue idValue = QTypedJson::toJsonValue(id);
        bool lastReq;
        {
            QMutexLocker l(&d->mutex);
            d->requestsInProgress.remove(idValue);
            lastReq = d->runStatus == RunStatus::WaitPending && d->requestsInProgress.size() <= 1;
            if (lastReq)
                d->runStatus = RunStatus::Stopping;
        }
        if (lastReq)
            executeShutdown();
    });
}
 
void QLanguageServer::setupCapabilities(const QLspSpecification::InitializeParams &clientInfo,
                                        QLspSpecification::InitializeResult &serverInfo)
{
    Q_D(QLanguageServer);
    for (auto module : std::as_const(d->modules))
        module->setupCapabilities(clientInfo, serverInfo);
}
 
const QLspSpecification::InitializeParams &QLanguageServer::clientInfo() const
{
    const Q_D(QLanguageServer);
 
    if (int(runStatus()) < int(RunStatus::DidInitialize))
        qCWarning(lspServerLog) << "asked for Language Server clientInfo before initialization";
    return d->clientInfo;
}
 
const QLspSpecification::InitializeResult &QLanguageServer::serverInfo() const
{
    const Q_D(QLanguageServer);
    if (int(runStatus()) < int(RunStatus::DidInitialize))
        qCWarning(lspServerLog) << "asked for Language Server serverInfo before initialization";
    return d->serverInfo;
}
 
void QLanguageServer::receiveData(const QByteArray &d)
{
    protocol()->receiveData(d);
}
 
void QLanguageServer::registerHandlers(QLanguageServerProtocol *protocol)
{
    QObject::connect(notifySignals(), &QLspNotifySignals::receivedCancelNotification, this,
                     [this](const QLspSpecification::Notifications::CancelParamsType &params) {
                         Q_D(QLanguageServer);
                         QJsonValue id = QTypedJson::toJsonValue(params.id);
                         QMutexLocker l(&d->mutex);
                         if (d->requestsInProgress.contains(id))
                             d->requestsInProgress[id].canceled = true;
                         else
                             qCWarning(lspServerLog)
                                     << "Ignoring cancellation of non in progress request" << id;
                     });
 
    protocol->registerInitializeRequestHandler(
            [this](const QByteArray &,
                   const QLspSpecification::Requests::InitializeParamsType &params,
                   QLspSpecification::Responses::InitializeResponseType &&response) {
                qCDebug(lspServerLog) << "init";
                Q_D(QLanguageServer);
                RunStatus rStatus;
                {
                    QMutexLocker l(&d->mutex);
                    rStatus = d->runStatus;
                    if (rStatus == RunStatus::DidSetup)
                        d->runStatus = RunStatus::Initializing;
                }
                if (rStatus != RunStatus::DidSetup) {
                    if (rStatus == RunStatus::NotSetup || rStatus == RunStatus::SettingUp)
                        response.sendErrorResponse(
                                int(QLspSpecification::ErrorCodes::InvalidRequest),
                                u"Initialization request received on non setup language server"_s
                                        .toUtf8());
                    else
                        response.sendErrorResponse(
                                int(QLspSpecification::ErrorCodes::InvalidRequest),
                                u"Received multiple initialization requests"_s.toUtf8());
                    emit lifecycleError();
                    return;
                }
                emit runStatusChanged(RunStatus::Initializing);
                d->clientInfo = params;
                setupCapabilities(d->clientInfo, d->serverInfo);
                {
                    QMutexLocker l(&d->mutex);
                    d->runStatus = RunStatus::DidInitialize;
                }
                emit runStatusChanged(RunStatus::DidInitialize);
                response.sendResponse(d->serverInfo);
            });
 
    QObject::connect(notifySignals(), &QLspNotifySignals::receivedInitializedNotification, this,
                     [this](const QLspSpecification::Notifications::InitializedParamsType &) {
                         Q_D(QLanguageServer);
                         {
                             QMutexLocker l(&d->mutex);
                             d->clientInitialized = true;
                         }
                         emit clientInitialized(this);
                     });
 
    protocol->registerShutdownRequestHandler(
            [this](const QByteArray &, const QLspSpecification::Requests::ShutdownParamsType &,
                   QLspSpecification::Responses::ShutdownResponseType &&response) {
                Q_D(QLanguageServer);
                RunStatus rStatus;
                bool shouldExecuteShutdown = false;
                {
                    QMutexLocker l(&d->mutex);
                    rStatus = d->runStatus;
                    if (rStatus == RunStatus::DidInitialize) {
                        d->shutdownResponse = std::move(response);
                        if (d->requestsInProgress.size() <= 1) {
                            d->runStatus = RunStatus::Stopping;
                            shouldExecuteShutdown = true;
                        } else {
                            d->runStatus = RunStatus::WaitPending;
                        }
                    }
                }
                if (rStatus != RunStatus::DidInitialize)
                    emit lifecycleError();
                else if (shouldExecuteShutdown)
                    executeShutdown();
            });
 
    QObject::connect(notifySignals(), &QLspNotifySignals::receivedExitNotification, this,
                     [this](const QLspSpecification::Notifications::ExitParamsType &) {
                         if (runStatus() != RunStatus::Stopped)
                             emit lifecycleError();
                         else
                             emit exit();
                     });
}
 
void QLanguageServer::executeShutdown()
{
    RunStatus rStatus = runStatus();
    if (rStatus != RunStatus::Stopping) {
        emit lifecycleError();
        return;
    }
    emit shutdown();
    QLspSpecification::Responses::ShutdownResponseType shutdownResponse;
    {
        Q_D(QLanguageServer);
        QMutexLocker l(&d->mutex);
        rStatus = d->runStatus;
        if (rStatus == RunStatus::Stopping) {
            shutdownResponse = std::move(d->shutdownResponse);
            d->runStatus = RunStatus::Stopped;
        }
    }
    if (rStatus != RunStatus::Stopping)
        emit lifecycleError();
    else
        shutdownResponse.sendResponse(nullptr);
}
 
bool QLanguageServer::isRequestCanceled(const QJsonRpc::IdType &id) const
{
    const Q_D(QLanguageServer);
    QJsonValue idVal = QTypedJson::toJsonValue(id);
    QMutexLocker l(&d->mutex);
    return d->requestsInProgress.value(idVal).canceled || d->runStatus != RunStatus::DidInitialize;
}
 
bool QLanguageServer::isInitialized() const
{
    switch (runStatus()) {
    case RunStatus::NotSetup:
    case RunStatus::SettingUp:
    case RunStatus::DidSetup:
    case RunStatus::Initializing:
        return false;
    case RunStatus::DidInitialize:
    case RunStatus::WaitPending:
    case RunStatus::Stopping:
    case RunStatus::Stopped:
        break;
    }
    return true;
}
 
QT_END_NAMESPACE