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root/src/sqlitebackupprocessor.cpp @ 9e2d71d6

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/*
* Copyright (C) 2015 Christian Ehringfeld <c.ehringfeld@t-online.de>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation.
*
* 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 Lesser General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
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#include "sqlitebackupprocessor.h"
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#include <sqlite3.h>
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#include <QFileInfoList>
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using namespace CuteEntityManager;
SqliteBackupProcessor::SqliteBackupProcessor(QSharedPointer<Database> database,
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QString destination) : QObject() {
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this->database = database;
this->destination = destination;
}
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SqliteBackupProcessor::SqliteBackupProcessor(QSharedPointer<Database> database,
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QString destination, QString backupFilename, QSharedPointer<QTimer> timer,
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bool incrementalBackups, int backupCount) {
this->database = database;
this->destination = destination;
this->timer = timer;
this->backupFilename = backupFilename;
this->incrementalBackups = incrementalBackups;
this->backupCount = backupCount;
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connect(timer.data(), &QTimer::timeout, this,
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&SqliteBackupProcessor::backup);
}

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SqliteBackupProcessor::~SqliteBackupProcessor() {
}
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QSharedPointer<Database> SqliteBackupProcessor::getDatabase() const {
return database;
}

void SqliteBackupProcessor::setDatabase(const QSharedPointer<Database> &value) {
database = value;
}
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QString SqliteBackupProcessor::getDestination() const {
return destination;
}

void SqliteBackupProcessor::setDestination(const QString &value) {
destination = value;
}

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/**
* @see http://www.qtcentre.org/threads/36131-Attempting-to-use-Sqlite-backup-api-from-driver-handle-fails
* @brief SqliteBackupProcessor::backup
* @param fileName
* @return
* This function is used to load the contents of a database file on disk
* into the "main" database of open database connection pInMemory, or
* to save the current contents of the database opened by pInMemory into
* a database file on disk. pInMemory is probably an in-memory database,
* but this function will also work fine if it is not.
*
* Parameter zFilename points to a nul-terminated string containing the
* name of the database file on disk to load from or save to. If parameter
* isSave is non-zero, then the contents of the file zFilename are
* overwritten with the contents of the database opened by pInMemory. If
* parameter isSave is zero, then the contents of the database opened by
* pInMemory are replaced by data loaded from the file zFilename.
*
* If the operation is successful, SQLITE_OK is returned. Otherwise, if
* an error occurs, an SQLite error code is returned.
*/
bool SqliteBackupProcessor::sqliteDBMemFile(bool save, QString fileName) {
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bool state = false;
QVariant v = this->database->getDatabase().driver()->handle();
if ( v.isValid() && qstrcmp(v.typeName(), "sqlite3*") == 0 ) {
// v.data() returns a pointer to the handle
sqlite3 *handle = *static_cast<sqlite3 **>(v.data());
if ( handle != 0 ) { // check that it is not NULL
sqlite3 *pInMemory = handle;
QByteArray array = QString(this->destination + "/" + fileName).toLocal8Bit();
const char *zFilename = array.data();
int rc; /* Function return code */
sqlite3 *pFile; /* Database connection opened on zFilename */
sqlite3_backup *pBackup; /* Backup object used to copy data */
sqlite3 *pTo; /* Database to copy to (pFile or pInMemory) */
sqlite3 *pFrom; /* Database to copy from (pFile or pInMemory) */

/* Open the database file identified by zFilename. Exit early if this fails
** for any reason. */
rc = sqlite3_open( zFilename, &pFile );
if ( rc == SQLITE_OK ) {
/* If this is a 'load' operation (isSave==0), then data is copied
** from the database file just opened to database pInMemory.
** Otherwise, if this is a 'save' operation (isSave==1), then data
** is copied from pInMemory to pFile. Set the variables pFrom and
** pTo accordingly. */
pFrom = ( save ? pInMemory : pFile);
pTo = ( save ? pFile : pInMemory);
/* Set up the backup procedure to copy from the "main" database of
** connection pFile to the main database of connection pInMemory.
** If something goes wrong, pBackup will be set to NULL and an error
** code and message left in connection pTo.
**
** If the backup object is successfully created, call backup_step()
** to copy data from pFile to pInMemory. Then call backup_finish()
** to release resources associated with the pBackup object. If an
** error occurred, then an error code and message will be left in
** connection pTo. If no error occurred, then the error code belonging
** to pTo is set to SQLITE_OK.
*/
pBackup = sqlite3_backup_init(pTo, "main", pFrom, "main");
if ( pBackup ) {
(void)sqlite3_backup_step(pBackup, -1);
(void)sqlite3_backup_finish(pBackup);
}
rc = sqlite3_errcode(pTo);
}
/* Close the database connection opened on database file zFilename
** and return the result of this function. */
(void)sqlite3_close(pFile);
if ( rc == SQLITE_OK ) {
state = true;
}
}
}
return state;
}
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void SqliteBackupProcessor::backup() {
QString fileName = this->destination + "/" + this->getBackupFilename();
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if (this->incrementalBackups) {
this->rotateBackup();
if (this->counter > 0) {
fileName += "." + QString::number(this->counter);
}
if (this->counter < this->backupCount) {
++this->counter;
}
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}
this->sqliteDBMemFile(true, fileName);
}

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void SqliteBackupProcessor::rotateBackup() {
if (this->counter == this->backupCount) {
QStringList nameFilter = QStringList(this->getBackupFilename());
QDir directory = QDir(this->destination);
QFileInfoList files = directory.entryInfoList(nameFilter);
for (int var = 0; var < files.size(); ++var) {
QFileInfo file = files.at(var);
if (file.isFile()) {
int lastIndex = file.filePath().lastIndexOf(".");
if (lastIndex > -1) {
QString sub = file.filePath().mid(lastIndex);
bool ok = false;
int num = sub.toInt(&ok);
QDir dir = QDir();
if (ok) {
if (num == 1) {
dir.rename(file.filePath(), file.path().mid(0, lastIndex));
} else {
dir.rename(file.filePath(), file.path().mid(0, lastIndex) + QString(num - 1));
}
} else {
dir.remove(file.filePath());
}
}
}
}
}
}

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QSharedPointer<QTimer> SqliteBackupProcessor::getTimer() const {
return timer;
}

void SqliteBackupProcessor::setTimer(const QSharedPointer<QTimer> &value) {
timer = value;
}

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bool SqliteBackupProcessor::getIncrementalBackups() const {
return incrementalBackups;
}

void SqliteBackupProcessor::setIncrementalBackups(bool value) {
incrementalBackups = value;
}

int SqliteBackupProcessor::getBackupCount() const {
return backupCount;
}

void SqliteBackupProcessor::setBackupCount(int value) {
backupCount = value;
}

QString SqliteBackupProcessor::getBackupFilename() const {
return backupFilename;
}

void SqliteBackupProcessor::setBackupFilename(const QString &value) {
backupFilename = value;
}