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//===========================================
// Lumina-DE source code
// Copyright (c) 2015, Ken Moore
// Available under the 3-clause BSD license
// See the LICENSE file for full details
//===========================================
// This is the backend classes for fetching directory information/contents
//===========================================
#ifndef _LUMINA_FM_BACKGROUND_DATA_CLASSES_H
#define _LUMINA_FM_BACKGROUND_DATA_CLASSES_H
#include <QObject>
#include <QList>
#include <QString>
#include <QFileInfo>
#include <QDir>
#include <LuminaXDG.h>
#include <LuminaUtils.h>
#define ZSNAPDIR QString("/.zfs/snapshot/")
#define DIR_DEBUG 0
//Class used for keeping track of directory information in the HASH
class LDirInfoList{
public:
//Internal variables
QDateTime lastcheck;
QList<LFileInfo> list;
QStringList fileNames; //list of filenames for comparison/checking sorting
QString dirpath; //directory this structure was reading
QString snapdir; //base snapshot directory (if one was requested/found)
bool hashidden;
//Access Functions
LDirInfoList(QString path = ""){
dirpath = path;
list.clear();
fileNames.clear();
hashidden = false;
}
~LDirInfoList(){}
//(re)Load a directory contents
void update(bool showhidden = false){
if(dirpath.isEmpty()){ return; } //nothing to do
//Assemble the structures
QDir dir(dirpath);
hashidden = showhidden;
if(!dir.exists()){
list.clear();
fileNames.clear();
dirpath.clear(); //invalid directory now
return;
}
if(dirpath.contains(ZSNAPDIR) && snapdir.isEmpty()){
snapdir = dirpath.section(ZSNAPDIR,0,0)+ZSNAPDIR; //no need to go looking for it later
}
QFileInfoList dirlist;
//Fill the structure
list.clear();
fileNames.clear();
lastcheck = QDateTime::currentDateTime().addMSecs(-500); //prevent missing any simultaneous dir changes
if(showhidden){ dirlist = dir.entryInfoList(QDir::AllEntries | QDir::NoDotAndDotDot | QDir::Hidden , QDir::Name | QDir::DirsFirst); }
else{ dirlist = dir.entryInfoList(QDir::AllEntries | QDir::NoDotAndDotDot , QDir::Name | QDir::DirsFirst); }
//Simple add routine - can make it more dynamic/selective about updating individual items later
for(int i=0; i<dirlist.length(); i++){
list << LFileInfo(dirlist[i]); //generate the extra information for this file
fileNames << dirlist[i].fileName(); //add the filename to the list
}
}
void findSnapDir(){
//Search the filesystem
if(dirpath.contains(ZSNAPDIR)){
snapdir = dirpath.section(ZSNAPDIR,0,0)+ZSNAPDIR; //no need to go looking for it
}else{
//Need to backtrack
QDir dir(dirpath);
bool found = false;
while(dir.canonicalPath()!="/" && !found){
//qDebug() << " -- Checking for snapshot dir:" << dir.canonicalPath();
if(dir.exists(".zfs/snapshot")){
snapdir = dir.canonicalPath()+ZSNAPDIR;
found = true;
}else{
dir.cdUp();
}
}//end loop
}
}
};
//This class is designed to be run in a background thread and get all the necessary info for a directory listing
class DirData : public QObject{
Q_OBJECT
private:
QHash<QString, LDirInfoList> HASH; //Where we cache any info for rapid access later
signals:
void DirDataAvailable(QString, QString, LFileInfoList); //[ID, Dirpath, DATA]
void SnapshotDataAvailable(QString, QString, QStringList); //[ID, BaseSnapDir, SnapNames]
public:
//Variables
bool showHidden; //Whether hidden files/dirs should be output
bool zfsavailable; //Whether it should even bother looking for ZFS snapshots
//Functions
DirData(){
showHidden = false;
zfsavailable = false;
}
~DirData(){}
public slots:
void GetDirData(QString ID, QString dirpath){
if(DIR_DEBUG){ qDebug() << "GetDirData:" << ID << dirpath; }
//The ID is used when returning the info in a moment
//Make sure to use the canonical path in the HASH search - don't use
QString canon = QFileInfo(dirpath).canonicalFilePath();
if(!HASH.contains(canon)){
//New directory (not previously loaded)
LDirInfoList info(canon);
info.update(showHidden);
HASH.insert(canon, info);
}else{
//See if the saved info needs to be updated
//if( (HASH.value(canon).hashidden != showHidden) || (QFileInfo(canon).lastModified() > HASH.value(canon).lastcheck) ){
HASH[canon].update(showHidden);
//}
}
if(DIR_DEBUG){ qDebug() << " -- Dir Data Found:" << ID << dirpath << HASH.value(canon).list.length(); }
emit DirDataAvailable(ID, dirpath, HASH.value(canon).list);
}
void GetSnapshotData(QString ID, QString dirpath){
if(DIR_DEBUG){ qDebug() << "GetSnapshotData:" << ID << dirpath; }
QString base; QStringList snaps;
//Only check if ZFS is flagged as available
if(zfsavailable){
//First find if the hash already has an entry for this directory
if(false){ //!HASH.contains(dirpath)){
LDirInfoList info(dirpath);
HASH.insert(dirpath,info);
}
//Now see if a snapshot directory has already been located
if(HASH.value(dirpath).snapdir.isEmpty()){
HASH[dirpath].findSnapDir();
}
//Now read off all the available snapshots
if(HASH.value(dirpath).snapdir != "-"){
//Good snapshot directory found - read off the current snapshots (can change regularly - don't cache this)
base = HASH.value(dirpath).snapdir;
QDir dir(base);
snaps = dir.entryList(QDir::Dirs | QDir::NoDotAndDotDot, QDir::Time |QDir::Reversed );
//NOTE: snaps are sorted oldest -> newest
}
}
//if(DIR_DEBUG){ qDebug() << " -- Snap Data Found:" << ID << base << snaps; }
emit SnapshotDataAvailable(ID, base, snaps);
}
};
#endif
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