src/base/asyncfilestorage.cpp

   1 /*
   2  * Bittorrent Client using Qt and libtorrent.
   3  * Copyright (C) 2017  Vladimir Golovnev <glassez@yandex.ru>
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  18  *
  19  * In addition, as a special exception, the copyright holders give permission to
  20  * link this program with the OpenSSL project's "OpenSSL" library (or with
  21  * modified versions of it that use the same license as the "OpenSSL" library),
  22  * and distribute the linked executables. You must obey the GNU General Public
  23  * License in all respects for all of the code used other than "OpenSSL".  If you
  24  * modify file(s), you may extend this exception to your version of the file(s),
  25  * but you are not obligated to do so. If you do not wish to do so, delete this
  26  * exception statement from your version.
  27  */
  28
  29 #include "asyncfilestorage.h"
  30
  31 #include <QDebug>
  32 #include <QMetaObject>
  33 #include <QSaveFile>
  34
  35 AsyncFileStorage::AsyncFileStorage(const QString &storageFolderPath, QObject *parent)
  36     : QObject(parent)
  37     , m_storageDir(storageFolderPath)
  38     , m_lockFile(m_storageDir.absoluteFilePath(QStringLiteral("storage.lock")))
  39 {
  40     if (!m_storageDir.mkpath(m_storageDir.absolutePath()))
  41         throw AsyncFileStorageError
  42         {tr("Could not create directory '%1'.")
  43                 .arg(m_storageDir.absolutePath())};
  44
  45     // TODO: This folder locking approach does not work for UNIX systems. Implement it.
  46     if (!m_lockFile.open(QFile::WriteOnly))
  47         throw AsyncFileStorageError {m_lockFile.errorString()};
  48 }
  49
  50 AsyncFileStorage::~AsyncFileStorage()
  51 {
  52     m_lockFile.close();
  53     m_lockFile.remove();
  54 }
  55
  56 void AsyncFileStorage::store(const QString &fileName, const QByteArray &data)
  57 {
  58     QMetaObject::invokeMethod(this, [this, data, fileName]() { store_impl(fileName, data); }
  59                               , Qt::QueuedConnection);
  60 }
  61
  62 QDir AsyncFileStorage::storageDir() const
  63 {
  64     return m_storageDir;
  65 }
  66
  67 void AsyncFileStorage::store_impl(const QString &fileName, const QByteArray &data)
  68 {
  69     const QString filePath = m_storageDir.absoluteFilePath(fileName);
  70     QSaveFile file(filePath);
  71     qDebug() << "AsyncFileStorage: Saving data to" << filePath;
  72     if (file.open(QIODevice::WriteOnly))
  73     {
  74         file.write(data);
  75         if (!file.commit())
  76         {
  77             qDebug() << "AsyncFileStorage: Failed to save data";
  78             emit failed(filePath, file.errorString());
  79         }
  80     }
  81 }