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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/LICENCE.TXT
#
# pylint: disable=no-absolute-import
import logging
import os
import signal
import json
from typing import Tuple
from clcommon.utils import get_process_pid
from clwpos.logsetup import setup_logging, init_wpos_sentry_safely
class WposDaemonBase:
"""
AccelerateWP daemon base class. Signals, signal handlers, setup daemon logger, pid file operations
"""
_PID_FILENAME = "/var/run/clwpos_monitoring.pid"
_DAEMON_LOGFILE_PATH = "/var/log/clwpos/daemon.log"
_DAEMON_CONFIG_PATH = "/etc/clwpos/daemon_conf.json"
# Default redis monitoring interval 300 seconds = 5 min
_DEFAULT_MONITORING_INTERVAL = 300
def __init__(self):
self._reload_config_need = False
self._is_terminate = False
self._monitoring_interval, self._is_reload_interval_enabled, is_full_logging_mode = \
self._update_monitoring_interval()
self._logger = setup_logging(
caller_name=__name__,
console_level=logging.DEBUG if is_full_logging_mode else logging.INFO,
file_level=logging.DEBUG if is_full_logging_mode else logging.INFO,
logfile_path=self._DAEMON_LOGFILE_PATH
)
init_wpos_sentry_safely(self._logger)
self._logger.info("Cloudlinux AccelerateWP daemon uses monitoring interval: %d seconds", self._monitoring_interval)
if not self._is_reload_interval_enabled:
self._logger.info("NOTE: Cloudlinux AccelerateWP daemon check reload interval is OFF by config")
if is_full_logging_mode:
self._logger.info("NOTE: Cloudlinux AccelerateWP daemon full logging mode is ON by config")
def _update_monitoring_interval(self) -> Tuple[int, bool, bool]:
"""
Read daemon parameters from config /etc/clwpos/daemon_conf.json. Use only for debug/testing.
:return: tuple (monitoring_interval, is_reload_interval_enabled, is_full_logging_mode)
monitoring_interval: redises monitoring inteval, seconds
is_reload_interval_enabled: True - daemon will disable 'reload' command via socket from same user
more often then 1 minute
False - daemon will not check time between 'reload' command,
all queries will be processed
is_full_logging_mode: True - debug messages will be written to log
False - debug messages will not be written to log
"""
try:
with open(self._DAEMON_CONFIG_PATH, 'r') as f:
daemon_config = json.load(f)
monitoring_interval = daemon_config['monitoring_interval_5secs'] * 5
is_reload_interval_enabled = daemon_config.get('is_reload_interval_enabled', True)
is_full_logging_mode = daemon_config.get('is_full_logging_mode', False)
except (OSError, IOError, json.JSONDecodeError, KeyError):
# Config read error, stay default
monitoring_interval = self._DEFAULT_MONITORING_INTERVAL
is_reload_interval_enabled = True
is_full_logging_mode = False
return monitoring_interval, is_reload_interval_enabled, is_full_logging_mode
def _setup_signals(self):
"""
Setup daemon signal handlers
"""
# Setup SIGHUP signal handler for config reload
signal.signal(signal.SIGHUP, self._sighup_handler)
# Setup Ctrl-C signal handler. Used for console debug
signal.signal(signal.SIGINT, self._sigint_handler)
# Setup SIGTERM signal. Called when daemon stops
signal.signal(signal.SIGTERM, self._sigterm_handler)
def run(self):
"""
Main work daemon function (implement in child class)
"""
raise NotImplementedError()
def stop(self, *args, **kwargs):
"""
Stops a working daemon process (implement in child class)
"""
raise NotImplementedError()
def reload(self):
"""
Reload working daemon process by sending SIGHUP signal to it
"""
try:
pid = get_process_pid(self._PID_FILENAME)
if pid:
os.kill(pid, signal.SIGHUP)
except:
pass
def _sighup_handler(self, signum, frame):
"""
SIGHUP signal handler
"""
# Load new user configuration from config file
self._reload_config_need = True
self._logger.info("SIGHUP: Cloudlinux AccelerateWP daemon sheduled for reload")
def _sigint_handler(self, signum, frame):
"""
SIGINT (Ctrl-C) signal handler. For console debug
"""
self._logger.info("Ctrl-C received, exit")
# Terminate main cycle
self._is_terminate = True
def _sigterm_handler(self, signum, frame):
"""
SIGTERM signal handler. Called when daemon stopping
"""
# Terminate main cycle
self._is_terminate = True
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