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# -*- 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
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, timestamp
@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
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