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
  34 #include "base/utils/fs.h"
  35 #include "base/utils/io.h"
  36
  37 AsyncFileStorage::AsyncFileStorage(const Path &storageFolderPath, QObject *parent)
  38     : QObject(parent)
  39     , m_storageDir(storageFolderPath)
  40     , m_lockFile((m_storageDir / Path(QStringLiteral("storage.lock"))).data())
  41 {
  42     Q_ASSERT(m_storageDir.isAbsolute());
  43
  44     if (!Utils::Fs::mkpath(m_storageDir))
  45         throw AsyncFileStorageError(tr("Could not create directory '%1'.").arg(m_storageDir.toString()));
  46
  47     // TODO: This folder locking approach does not work for UNIX systems. Implement it.
  48     if (!m_lockFile.open(QFile::WriteOnly))
  49         throw AsyncFileStorageError(m_lockFile.errorString());
  50 }
  51
  52 AsyncFileStorage::~AsyncFileStorage()
  53 {
  54     m_lockFile.close();
  55     m_lockFile.remove();
  56 }
  57
  58 void AsyncFileStorage::store(const Path &filePath, const QByteArray &data)
  59 {
  60     QMetaObject::invokeMethod(this, [this, data, filePath]() { store_impl(filePath, data); }
  61                               , Qt::QueuedConnection);
  62 }
  63
  64 Path AsyncFileStorage::storageDir() const
  65 {
  66     return m_storageDir;
  67 }
  68
  69 void AsyncFileStorage::store_impl(const Path &fileName, const QByteArray &data)
  70 {
  71     const Path filePath = m_storageDir / fileName;
  72     qDebug() << "AsyncFileStorage: Saving data to" << filePath.toString();
  73
  74     const nonstd::expected<void, QString> result = Utils::IO::saveToFile(filePath, data);
  75     if (!result)
  76     {
  77         qDebug() << "AsyncFileStorage: Failed to save data";
  78         emit failed(filePath, result.error());
  79     }
  80 }