\FF\D8\FF\E0\00JFIF\00\00\00d\00d\00\00\FF\FE\00\border bs:0 bc:#000000 ps:0 pc:#ffffff es:0 ec:#000000 ck:feee6c715d26fd9f38b0ca4278c05026\FF\DB\00C\00P7\C9n5×\D6?\BDê\9Ds\EBp\9F[`8m\B7)o\B5\E8\E6I\99\FE3]]A2\BA\8Cw\D6E\93\\DEv\C8\009\F2\F1NI?uc\\F5\EA\96k\xN<~buv\EA\C8\D7 \8B\84\CEcxI\BBg\AE\9E=\D6+n\EC\80\C8A\8C\AE\EB\CF\D5\DA\E9"2\A4\B9j5\EB\F3W\B63\96\B30Yu\DA\FC8\ED\DF\E7Ms\FB\F1\8E\B3\FA\EA\E8\E6(\883zs\F2_\8DFk\8Bh \00\8C\DCw\D3R\B5+6X\BA\B2\C4j\AB0\B4\FCMw\C2I\8E\9B\E3\A9~9u\FA\D3l\80\C8%p\EE\FDn2€ \00 $\FEj\C4e\A9\DB\~\95\A7\A5\80EK\BB\8DDsP\00@@AD'k\CF\E8\DB\D2(\80\9AK\D3\85\D6lb\F2\BA\8C*\80\00)\95 59\A3R:\F3\CE"\B6\80\88\00\00i1u4ê\E9\F2á\A6\A2\FACM\93WMb*\E0*\00\00\00\00\00(\A8\80\00\00\80\00\00\00\00\00\00\00\00\00\FF\D9 C/// # -*- coding: utf-8 -*- # Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2021 All Rights Reserved # # Licensed under CLOUD LINUX LICENSE AGREEMENT # http://cloudlinux.com/docs/LICENSE.TXT import logging import os from dataclasses import dataclass from typing import Optional from xray import gettext as _ from .constants import fpm_stat_storage, fpm_reload_timeout from .exceptions import XRayError from .utils import dbm_storage, filelock, timestamp logger = logging.getLogger('fpm_utils') @dataclass class FPMReloadController: """ Class to control the frequency of FPM service reloading """ fpm_service: str @property def latest_reload(self) -> Optional[int]: """ Get the timestamp of latest reload of FPM service """ try: with dbm_storage(fpm_stat_storage) as _fpm_reload_stat: try: return int(_fpm_reload_stat[self.fpm_service].decode()) except KeyError: return None except RuntimeError as e: raise XRayError(_('Failed to get the timestamp of latest FPM reload: %s') % str(e), flag='warning') def save_latest_reload(self): """ Save the timestamp of latest reload of FPM service """ try: # save timestamp of latest reload of corresponding service with dbm_storage(fpm_stat_storage) as _fpm_reload_stat: _fpm_reload_stat[self.fpm_service] = str(timestamp()) except RuntimeError as e: raise XRayError( _('Failed to save the timestamp of latest FPM reload %s, but main operation executed') % str(e), flag='warning', ) def delta(self) -> float: """ Get the time delta between current time and saved timestamp """ try: # we store timestamp in seconds, # but timeout -- fpm_reload_timeout -- in minutes return (timestamp() - self.latest_reload) / 60 except (TypeError, XRayError): # 1 hour, # big enough for non-blocking flow in case of unexpected errors return 60.0 def restrict(self) -> bool: """ Check if FPM reload should be blocked """ return self.delta() <= fpm_reload_timeout def reserve_reload_slot(self) -> bool: """ Atomically decide whether THIS caller may perform the throttled reload and, if so, reserve the slot before returning. ``restrict`` (the check) and ``save_latest_reload`` (the reserve) must run as a single critical section shared across processes. Otherwise several concurrent user-mode user-agent processes can each observe an expired window, all pass the check, and each run the service reload -- preserving the server-wide DoS this throttle is meant to close (a tenant