qBittorrent/src/base/bittorrent/resumedatastorage.h

/*
 * Bittorrent Client using Qt and libtorrent.
 * Copyright (C) 2015, 2018  Vladimir Golovnev <glassez@yandex.ru>
 *
 * 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 2
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * In addition, as a special exception, the copyright holders give permission to
 * link this program with the OpenSSL project's "OpenSSL" library (or with
 * modified versions of it that use the same license as the "OpenSSL" library),
 * and distribute the linked executables. You must obey the GNU General Public
 * License in all respects for all of the code used other than "OpenSSL".  If you
 * modify file(s), you may extend this exception to your version of the file(s),
 * but you are not obligated to do so. If you do not wish to do so, delete this
 * exception statement from your version.
 */

#pragma once

#include <optional>

#include <libtorrent/fwd.hpp>

#include <QDir>
#include <QObject>
#include <QVector>

#include "infohash.h"
#include "loadtorrentparams.h"

class QByteArray;

namespace BitTorrent
{
    class ResumeDataStorage : public QObject
    {
        Q_OBJECT
        Q_DISABLE_COPY(ResumeDataStorage)

    public:
        using QObject::QObject;

        virtual QVector<TorrentID> registeredTorrents() const = 0;
        virtual std::optional<LoadTorrentParams> load(const TorrentID &id) const = 0;
        virtual void store(const TorrentID &id, const LoadTorrentParams &resumeData) const = 0;
        virtual void remove(const TorrentID &id) const = 0;
        virtual void storeQueue(const QVector<TorrentID> &queue) const = 0;
    };

    class BencodeResumeDataStorage final : public ResumeDataStorage
    {
        Q_OBJECT
        Q_DISABLE_COPY(BencodeResumeDataStorage)

    public:
        explicit BencodeResumeDataStorage(const QString &resumeFolderPath);

        QVector<TorrentID> registeredTorrents() const override;
        std::optional<LoadTorrentParams> load(const TorrentID &id) const override;
        void store(const TorrentID &id, const LoadTorrentParams &resumeData) const override;
        void remove(const TorrentID &id) const override;
        void storeQueue(const QVector<TorrentID> &queue) const override;

    private:
        std::optional<LoadTorrentParams> loadTorrentResumeData(const QByteArray &data, const TorrentInfo &metadata) const;

        const QDir m_resumeDataDir;
        QVector<TorrentID> m_registeredTorrents;
    };
}