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instancemanager.cpp

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    instancemanager.cpp 6.66 KiB
    /*
     * Copyright (C) 2019-2024 Savoir-faire Linux Inc.
     * Author: Andreas Traczyk <andreas.traczyk@savoirfairelinux.com>
     *
     * This program is free software; you can redistribute it and/or modify
     * it under the terms of the GNU General Public License as published by
     * the Free Software Foundation; either version 3 of the License, or
     * (at your option) any later version.
     *
     * This program is distributed in the hope that it will be useful,
     * but WITHOUT ANY WARRANTY; without even the implied warranty of
     * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     * GNU General Public License for more details.
     *
     * You should have received a copy of the GNU General Public License
     * along with this program.  If not, see <http://www.gnu.org/licenses/>.
     */
    
    #include "instancemanager.h"
    
    #include "mainapplication.h"
    
    #include <QCryptographicHash>
    #include <QLocalSocket>
    #include <QLocalServer>
    #include <QSharedMemory>
    #include <QSystemSemaphore>
    
    static QString
    generateKeyHash(const QString& key, const QString& salt)
    {
        QByteArray data;
        data.append(key.toUtf8());
        data.append(salt.toUtf8());
        data = QCryptographicHash::hash(data, QCryptographicHash::Sha1).toHex();
        return data;
    }
    
    class InstanceManager::Impl : public QObject
    {
        Q_OBJECT
        Q_DISABLE_COPY(Impl)
    public:
        Impl(const QString& key, MainApplication* mainApp)
            : QObject(nullptr)
            , mainAppInstance_(mainApp)
            , key_(key)
            , memLockKey_(generateKeyHash(key, "_memLockKey"))
            , sharedmemKey_(generateKeyHash(key, "_sharedmemKey"))
            , sharedMem_(sharedmemKey_)
            , memLock_(memLockKey_, 1)
        {}
        ~Impl() = default;
    
        bool tryToRun(const QByteArray& startUri)
        {
            if (isAnotherRunning()) {
                // This is a secondary instance, connect to the primary
                // instance to trigger a restore then die.
                if (connectToLocal()) {
                    // Okay we connected. Send the start uri if not empty.
                    if (startUri.size()) {
                        qDebug() << "Sending start URI to secondary instance." << startUri;
                        socket_->write(startUri);
                        socket_->waitForBytesWritten();
                    }
    
                    // Now this instance can die.
                    return false;
                }