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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) Zenju (zenju AT gmx DOT de) - All Rights Reserved *
// **************************************************************************
#include "watcher.h"
#include <set>
#include <zen/tick_count.h>
#include <zen/file_handling.h>
#include <zen/stl_tools.h>
#include <zen/dir_watcher.h>
#include <zen/thread.h>
#include <zen/assert_static.h>
#include <zen/tick_count.h>
#include <wx+/string_conv.h>
#include "../lib/resolve_path.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
using namespace zen;
namespace
{
const std::int64_t TICKS_UPDATE_INTERVAL = rts::UI_UPDATE_INTERVAL* ticksPerSec() / 1000;
TickVal lastExec = getTicks();
};
bool rts::updateUiIsAllowed()
{
const TickVal now = getTicks(); //0 on error
if (now - lastExec >= TICKS_UPDATE_INTERVAL) //perform ui updates not more often than necessary
{
lastExec = now;
return true;
}
return false;
}
namespace
{
const int CHECK_DIR_INTERVAL = 1; //unit: [s]
std::vector<Zstring> getFormattedDirs(const std::vector<Zstring>& dirs) //throw FileError
{
std::set<Zstring, LessFilename> tmp; //make unique
std::transform(dirs.begin(), dirs.end(), std::inserter(tmp, tmp.end()),
[](const Zstring& dirnameNonFmt) { return getFormattedDirectoryName(dirnameNonFmt); });
return std::vector<Zstring>(tmp.begin(), tmp.end());
}
}
rts::WaitResult rts::waitForChanges(const std::vector<Zstring>& dirNamesNonFmt, WaitCallback& statusHandler) //throw FileError
{
const std::vector<Zstring> dirNamesFmt = getFormattedDirs(dirNamesNonFmt); //throw FileError
if (dirNamesFmt.empty()) //pathological case, but check is needed nevertheless
throw zen::FileError(_("A folder input field is empty.")); //should have been checked by caller!
//detect when volumes are removed/are not available anymore
std::vector<std::pair<Zstring, std::shared_ptr<DirWatcher>>> watches;
for (auto iter = dirNamesFmt.begin(); iter != dirNamesFmt.end(); ++iter)
{
const Zstring& dirnameFmt = *iter;
try
{
//a non-existent network path may block, so check existence asynchronously!
auto ftDirExists = async([=] { return zen::dirExists(dirnameFmt); });
while (!ftDirExists.timed_wait(boost::posix_time::milliseconds(UI_UPDATE_INTERVAL)))
statusHandler.requestUiRefresh(); //may throw!
if (!ftDirExists.get())
return WaitResult(CHANGE_DIR_MISSING, dirnameFmt);
watches.push_back(std::make_pair(dirnameFmt, std::make_shared<DirWatcher>(dirnameFmt))); //throw FileError, ErrorNotExisting
}
catch (ErrorNotExisting&) //nice atomic behavior: *no* second directory existence check!!!
{
return WaitResult(CHANGE_DIR_MISSING, dirnameFmt);
}
catch (FileError&) //play safe: remedy potential FileErrors that should have been ErrorNotExisting (e.g. Linux: errors during directory traversing)
{
if (!dirExists(dirnameFmt)) //file system race condition!!
return WaitResult(CHANGE_DIR_MISSING, dirnameFmt);
throw;
}
}
const std::int64_t TICKS_DIR_CHECK_INTERVAL = CHECK_DIR_INTERVAL * ticksPerSec(); //0 on error
TickVal lastCheck = getTicks(); //0 on error
while (true)
{
const bool checkDirExistNow = [&]() -> bool //checking once per sec should suffice
{
const TickVal now = getTicks(); //0 on error
if (now - lastCheck >= TICKS_DIR_CHECK_INTERVAL)
{
lastCheck = now;
return true;
}
return false;
}();
for (auto iter = watches.begin(); iter != watches.end(); ++iter)
{
const Zstring& dirname = iter->first;
DirWatcher& watcher = *(iter->second);
//IMPORTANT CHECK: dirwatcher has problems detecting removal of top watched directories!
if (checkDirExistNow)
if (!dirExists(dirname)) //catch errors related to directory removal, e.g. ERROR_NETNAME_DELETED
return WaitResult(CHANGE_DIR_MISSING, dirname);
try
{
std::vector<Zstring> changedFiles = watcher.getChanges([&] { statusHandler.requestUiRefresh(); }); //throw FileError, ErrorNotExisting
//remove to be ignored changes
vector_remove_if(changedFiles, [](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
});
if (!changedFiles.empty())
{
/*
std::for_each(changedFiles.begin(), changedFiles.end(),
[](const Zstring& fn) { wxMessageBox(toWx(fn));});
*/
return WaitResult(CHANGE_DETECTED, changedFiles[0]); //directory change detected
}
}
catch (ErrorNotExisting&) //nice atomic behavior: *no* second directory existence check!!!
{
return WaitResult(CHANGE_DIR_MISSING, dirname);
}
catch (FileError&) //play safe: remedy potential FileErrors that should have been ErrorNotExisting (e.g. Linux: errors during directory traversing)
{
if (!dirExists(dirname)) //file system race condition!!
return WaitResult(CHANGE_DIR_MISSING, dirname);
throw;
}
}
boost::this_thread::sleep(boost::posix_time::milliseconds(rts::UI_UPDATE_INTERVAL));
statusHandler.requestUiRefresh(true); //throw ?: may start sync at this presumably idle time
}
}
//support for monitoring newly connected directories volumes (e.g.: USB-sticks)
void rts::waitForMissingDirs(const std::vector<Zstring>& dirNamesNonFmt, WaitCallback& statusHandler) //throw FileError
{
while (true)
{
//support specifying volume by name => call getFormattedDirectoryName() repeatedly
const std::vector<Zstring>& dirNamesFmt = getFormattedDirs(dirNamesNonFmt); //throw FileError
bool allExisting = true;
for (auto iter = dirNamesFmt.begin(); iter != dirNamesFmt.end(); ++iter)
{
const Zstring dirnameFmt = *iter;
auto ftDirExisting = async([=]() -> bool
{
#ifdef FFS_WIN
//1. login to network share, if necessary -> we probably do NOT want multiple concurrent runs: GUI!?
loginNetworkShare(dirnameFmt, false); //login networks shares, no PW prompt -> is this really RTS's job?
#endif
//2. check dir existence
return zen::dirExists(dirnameFmt);
});
while (!ftDirExisting.timed_wait(boost::posix_time::milliseconds(rts::UI_UPDATE_INTERVAL)))
statusHandler.requestUiRefresh(); //may throw!
if (!ftDirExisting.get())
{
allExisting = false;
break;
}
}
if (allExisting)
return;
//wait some time...
assert_static(1000 * CHECK_DIR_INTERVAL % UI_UPDATE_INTERVAL == 0);
for (int i = 0; i < 1000 * CHECK_DIR_INTERVAL / UI_UPDATE_INTERVAL; ++i)
{
boost::this_thread::sleep(boost::posix_time::milliseconds(UI_UPDATE_INTERVAL));
statusHandler.requestUiRefresh();
}
}
}
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