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first cut at restoreFromMostRecentBackup

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ZappoMan 2015-01-12 14:32:13 -08:00
parent 1562aab6da
commit 7b65c75414
2 changed files with 69 additions and 0 deletions
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67
libraries/octree/src/OctreePersistThread.cpp
View file

@ -13,7 +13,10 @@
#include <fstream>
#include <time.h>
#include <QDateTime>
#include <QDebug>
#include <QDir>
#include <QDirIterator>
#include <QFile>
#include <PerfStat.h>
@ -65,6 +68,10 @@ bool OctreePersistThread::process() {
if(lockFile.is_open()) {
qDebug() << "WARNING: Octree lock file detected at startup:" << lockFileName
<< "-- Attempting to restore from previous backup file.";
// This is where we should attempt to find the most recent backup and restore from
// that file as our persist file.
restoreFromMostRecentBackup();
lockFile.close();
qDebug() << "Loading Octree... lock file closed:" << lockFileName;
@ -184,6 +191,66 @@ void OctreePersistThread::persist() {
}
}
void OctreePersistThread::restoreFromMostRecentBackup() {
qDebug() << "Restoring from most recent backup...";
// Based on our backup file name, determine the path and file name pattern for backup files
QFileInfo persistFileInfo(_filename);
QString path = persistFileInfo.path();
QString fileNamePart = persistFileInfo.fileName();
// Create a file filter that will find all backup files of this extension format
QString backupExtension = _backupExtensionFormat;
if (_backupExtensionFormat.contains("%N")) {
backupExtension.replace(QString("%N"), "*");
} else {
qDebug() << "This backup extension format does not yet support restoring from most recent backup...";
return; // exit early, unable to restore from backup
}
QString backupFileNamePart = fileNamePart + backupExtension;
QStringList filters;
filters << backupFileNamePart;
bool bestBackupFound = false;
QString bestBackupFile;
QDateTime bestBackupFileTime;
// Iterate over all of the backup files in the persist location
QDirIterator dirIterator(path, filters, QDir::Files|QDir::NoSymLinks, QDirIterator::NoIteratorFlags);
while(dirIterator.hasNext()) {
dirIterator.next();
QDateTime lastModified = dirIterator.fileInfo().lastModified();
// Based on last modified date, track the most recently modified file as the best backup
if (lastModified > bestBackupFileTime) {
bestBackupFound = true;
bestBackupFile = dirIterator.filePath();
bestBackupFileTime = lastModified;
}
}
// If we found a backup file, restore from that file.
if (bestBackupFound) {
qDebug() << "BEST backup file:" << bestBackupFile << " last modified:" << bestBackupFileTime.toString();
qDebug() << "Removing old file:" << _filename;
remove(qPrintable(_filename));
qDebug() << "Restoring backup file " << bestBackupFile << "...";
bool result = QFile::copy(bestBackupFile, _filename);
if (result) {
qDebug() << "DONE restoring backup file " << bestBackupFile << "to" << _filename << "...";
} else {
qDebug() << "ERROR while restoring backup file " << bestBackupFile << "to" << _filename << "...";
}
} else {
qDebug() << "NO BEST backup file found.";
}
}
void OctreePersistThread::rollOldBackupVersions() {
if (!_backupExtensionFormat.contains("%N")) {
return; // this backup extension format doesn't support rolling

2
libraries/octree/src/OctreePersistThread.h
View file

@ -48,6 +48,8 @@ protected:
void persist();
void backup();
void rollOldBackupVersions();
void restoreFromMostRecentBackup();
private:
Octree* _tree;
QString _filename;