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// *****************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: https://www.gnu.org/licenses/gpl-3.0 *
// * Copyright (C) Zenju (zenju AT freefilesync DOT org) - All Rights Reserved *
// *****************************************************************************
#ifndef DIR_WATCHER_348577025748023458
#define DIR_WATCHER_348577025748023458
#include <vector>
#include <chrono>
#include <functional>
#include "file_error.h"
namespace zen
{
//Windows: ReadDirectoryChangesW https://docs.microsoft.com/en-us/windows/win32/api/winbase/nf-winbase-readdirectorychangesw
//Linux: inotify https://linux.die.net/man/7/inotify
//macOS: kqueue https://developer.apple.com/library/mac/documentation/Darwin/Reference/ManPages/man2/kqueue.2.html
//watch directory including subdirectories
/*
!Note handling of directories!:
Windows: removal of top watched directory is NOT notified when watching the dir handle, e.g. brute force usb stick removal,
(watchting for GUID_DEVINTERFACE_WPD OTOH works fine!)
however manual unmount IS notified (e.g. USB stick removal, then re-insert), but watching is stopped!
Renaming of top watched directory handled incorrectly: Not notified(!) + additional changes in subfolders
now do report FILE_ACTION_MODIFIED for directory (check that should prevent this fails!)
Linux: newly added subdirectories are reported but not automatically added for watching! -> reset Dirwatcher!
removal of base directory is NOT notified!
macOS: everything works as expected; renaming of base directory is also detected
Overcome all issues portably: check existence of top watched directory externally + reinstall watch after changes in directory structure (added directories) are detected
*/
class DirWatcher
{
public:
explicit DirWatcher(const Zstring& dirPath); //throw FileError
~DirWatcher();
enum class ChangeType
{
create, //
update, //informal: use for debugging/logging only!
remove, //
baseFolderUnavailable, //1. not existing or 2. can't access
};
struct Change
{
ChangeType type = ChangeType::create;
Zstring itemPath;
};
//extract accumulated changes since last call
std::vector<Change> fetchChanges(const std::function<void()>& requestUiUpdate, std::chrono::milliseconds cbInterval); //throw FileError
private:
DirWatcher (const DirWatcher&) = delete;
DirWatcher& operator=(const DirWatcher&) = delete;
const Zstring baseDirPath_;
struct Impl;
const std::unique_ptr<Impl> pimpl_;
};
}
#endif
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