public static function dataCompileLoop($opts)
{
self::log("Using database master: " . WH_DATABASE_MASTER . "\n");
$origToken = self::getToken();
$numErrors = 0;
$stopMsg = '';
$data = new DashboardData();
// The dashboard is very susceptible to going down when we're doing
// maintenance on our spare server. Using this flag is a way to hold
// the stats steady by reading them once from the master DB and not again
// until the daemon is restarted.
$fakeStats = isset($opts['f']) || isset($opts['fake-stats']);
if ($fakeStats) {
$data->fetchOnFirstCallOnly();
}
$staticData = $data->loadStaticGlobalOpts();
$baselines = (array) json_decode($staticData['cdo_baselines_json']);
DashboardWidget::setBaselines($baselines);
// Run the data compilation repeatedly, until token changes
while (1) {
$start = microtime(true);
$success = $data->compileStatsData();
$end = microtime(true);
$delta = $end - $start;
$logMsg = sprintf('data refresh took %.3fs', $delta);
if ($success) {
$numErrors = 0;
} else {
$logMsg = sprintf('error was detected in data refresh (%.3fs)', $delta);
$numErrors++;
if ($numErrors >= self::STOP_AFTER_ERRORS) {
$stopMsg = sprintf('there were %d errors in a row. stopping daemon.', self::STOP_AFTER_ERRORS);
}
}
self::log($logMsg);
if (!empty($stopMsg)) {
break;
}
$until_refresh_seconds = self::REFRESH_SECONDS - $delta;
if ($until_refresh_seconds >= 0.0) {
$secs = (int) ceil($until_refresh_seconds);
sleep($secs);
}
$token = self::getToken();
if ($token != $origToken) {
$stopMsg = 'stop daemon requested through token change.';
break;
}
}
if ($stopMsg) {
self::log($stopMsg);
}
}
