<?php
/* NOTE: returns true when rate limit kicks in */
function ratelimit($key, $burst, $fill_seconds)
{
	db_transaction_up();
	$cdata = get_config("rlimit_".$key, [ "last" => 0, "level" => 0 ]);
	if ($cdata['level'] <= 0) {
		$now = time();
		$mfill = floor(($now - $cdata['last']) / $fill_seconds);
		if ($mfill > 0) {
			$cdata['level'] = min($burst, $cdata['level'] + $mfill);
			$cdata['last'] = $now;
		}
	}

	if ($cdata['level'] > 0) {
		--$cdata['level'];
		set_config("rlimit_".$key, $cdata);
		db_transaction_down();
		return false;
	} else {
		db_transaction_fail();
		return true;
	}
}
?>