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// **************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl.html *
// * Copyright (C) 2008-2011 ZenJu (zhnmju123 AT gmx.de) *
// **************************************************************************
//
#include "watcher.h"
#include "../shared/file_handling.h"
#include "../shared/i18n.h"
#include <set>
#include <wx/timer.h>
#include "../shared/resolve_path.h"
#include "../shared/dir_watcher.h"
#include "../shared/string_conv.h"
//#include "../library/db_file.h" //SYNC_DB_FILE_ENDING -> complete file too much of a dependency; file ending too little to decouple into single header
//#include "../library/lock_holder.h" //LOCK_FILE_ENDING
#include <wx/msgdlg.h>
using namespace zen;
bool rts::updateUiIsAllowed()
{
static wxLongLong lastExec;
const wxLongLong newExec = wxGetLocalTimeMillis();
if (newExec - lastExec >= rts::UI_UPDATE_INTERVAL) //perform ui updates not more often than necessary
{
lastExec = newExec;
return true;
}
return false;
}
class MonitorExistence //detect changes to directory availability
{
public:
MonitorExistence() : allExisting_(true) {}
//initialization
void addForMonitoring(const Zstring& dirName)
{
dirList.insert(dirName);
}
bool allExisting() const //polling explicitly allowed!
{
const int UPDATE_INTERVAL = 1000; //1 second interval
const wxLongLong current = wxGetLocalTimeMillis();
if (current - lastCheck >= UPDATE_INTERVAL)
{
lastCheck = current;
allExisting_ = std::find_if(dirList.begin(), dirList.end(), std::not1(std::ptr_fun(&zen::dirExists))) == dirList.end();
}
return allExisting_;
}
private:
mutable wxLongLong lastCheck;
mutable bool allExisting_;
std::set<Zstring, LessFilename> dirList; //save avail. directories, avoid double-entries
};
rts::WaitResult rts::waitForChanges(const std::vector<Zstring>& dirNames, WaitCallback* statusHandler) //throw(FileError)
{
if (dirNames.empty()) //pathological case, but check is needed nevertheless
throw zen::FileError(_("A directory input field is empty."));
//detect when volumes are removed/are not available anymore
MonitorExistence checkExist;
std::vector<std::shared_ptr<DirWatcher>> watches;
for (std::vector<Zstring>::const_iterator i = dirNames.begin(); i != dirNames.end(); ++i)
{
const Zstring formattedDir = zen::getFormattedDirectoryName(*i);
if (formattedDir.empty())
throw zen::FileError(_("A directory input field is empty."));
checkExist.addForMonitoring(formattedDir);
try
{
watches.push_back(std::make_shared<DirWatcher>(formattedDir)); //throw FileError
}
catch (zen::FileError&)
{
if (!zen::dirExists(formattedDir)) //that's no good locking behavior, but better than nothing
return CHANGE_DIR_MISSING;
throw;
}
}
while (true)
{
//IMPORTANT CHECK: dirwatcher has problems detecting removal of top watched directories!
if (!checkExist.allExisting()) //check for removed devices:
return CHANGE_DIR_MISSING;
try
{
for (auto iter = watches.begin(); iter != watches.end(); ++iter)
{
std::vector<Zstring> changedFiles = (*iter)->getChanges(); //throw FileError
//remove to be ignored changes
changedFiles.erase(std::remove_if(changedFiles.begin(), changedFiles.end(),
[](const Zstring& name)
{
return endsWith(name, Zstr(".ffs_lock")) || //sync.ffs_lock, sync.Del.ffs_lock
endsWith(name, Zstr(".ffs_db")); //sync.ffs_db, .sync.tmp.ffs_db
//no need to ignore temporal recycle bin directory: this must be caused by a file deletion anyway
}), changedFiles.end());
if (!changedFiles.empty())
{
/*
std::for_each(changedFiles.begin(), changedFiles.end(),
[](const Zstring& fn) { wxMessageBox(toWx(fn));});
const wxString filename = toWx(changedFiles[0]);
::wxSetEnv(wxT("RTS_CHANGE"), filename);
*/
return CHANGE_DETECTED; //directory change detected
}
}
}
catch (FileError&)
{
//maybe some error is caused due to some unexpected removal/unavailability of a watched directory? If so we can remedy this error:
if (!checkExist.allExisting())
return CHANGE_DIR_MISSING;
throw;
}
wxMilliSleep(rts::UI_UPDATE_INTERVAL);
statusHandler->requestUiRefresh();
}
}
//support for monitoring newly connected directories volumes (e.g.: USB-sticks)
void rts::waitForMissingDirs(const std::vector<Zstring>& dirNames, WaitCallback* statusHandler) //throw(FileError)
{
wxLongLong lastCheck;
while (true)
{
const int UPDATE_INTERVAL = 1000; //1 second interval
const wxLongLong current = wxGetLocalTimeMillis();
if (current - lastCheck >= UPDATE_INTERVAL)
{
lastCheck = current;
bool allExisting = true;
for (std::vector<Zstring>::const_iterator i = dirNames.begin(); i != dirNames.end(); ++i)
{
//support specifying volume by name => call getFormattedDirectoryName() repeatedly
const Zstring formattedDir = zen::getFormattedDirectoryName(*i);
if (formattedDir.empty())
throw zen::FileError(_("A directory input field is empty."));
if (!zen::dirExists(formattedDir))
{
allExisting = false;
break;
}
}
if (allExisting) //check for newly arrived devices:
return;
}
wxMilliSleep(rts::UI_UPDATE_INTERVAL);
statusHandler->requestUiRefresh();
}
}
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