static function run_cron($async = false)
{
// check if it's time to run crons, and if crons are already running.
$next_cron = DateTime::create(Options::get('next_cron'));
$time = DateTime::create();
if ($next_cron->int > $time->int || Options::get('cron_running') && Options::get('cron_running') > microtime(true)) {
return;
}
// cron_running will timeout in 10 minutes
// round cron_running to 4 decimals
$run_time = microtime(true) + 600;
$run_time = sprintf("%.4f", $run_time);
Options::set('cron_running', $run_time);
if ($async) {
// Timeout is really low so that it doesn't wait for the request to finish
$cronurl = URL::get('cron', array('time' => $run_time, 'asyncronous' => Utils::crypt(Options::get('public-GUID'))));
$request = new RemoteRequest($cronurl, 'GET', 1);
try {
$request->execute();
} catch (RemoteRequest_Timeout $e) {
// the request timed out - we knew that would happen
} catch (\Exception $e) {
// some other error occurred. we still don't care
}
} else {
// @todo why do we usleep() and why don't we just call act_poll_cron()?
usleep(5000);
if (Options::get('cron_running') != $run_time) {
return;
}
$time = DateTime::create();
$crons = DB::get_results('SELECT * FROM {crontab} WHERE start_time <= ? AND next_run <= ? AND active != ?', array($time->sql, $time->sql, 0), 'CronJob');
if ($crons) {
foreach ($crons as $cron) {
$cron->execute();
}
}
EventLog::log(_t('CronTab run completed.'), 'debug', 'crontab', 'habari', $crons);
// set the next run time to the lowest next_run OR a max of one day.
$next_cron = DB::get_value('SELECT next_run FROM {crontab} WHERE active != ? ORDER BY next_run ASC LIMIT 1', array(0));
Options::set('next_cron', min(intval($next_cron), $time->modify('+1 day')->int));
Options::set('cron_running', false);
}
}
