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Mini Shell
Mini Shell
# -*- 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 signal
import sys
from typing import Union, Iterable, Callable
from .utils import switch_schedstats, no_xray_active_tasks
from ..modules.processor import RequestProcessor
logger = logging.getLogger('tools')
def log_on_receive(signum: int, frame) -> None:
"""
Signal handler to log received signal
"""
logger.info('Received sig: %i (%s)', signum, signum)
def sigterm_received(signum: int, frame) -> None:
"""
Signal handler to dump collected statistics and switch off schedstats
"""
logger.info('Received sig: %i', signum)
RequestProcessor().flush_buffer()
logger.info('Dumped successfully after %i signal, exiting...', signum)
# disable throttling detection kernel mechanism
# if there is no X-Ray tracing tasks active
if no_xray_active_tasks():
logger.info('No X-Ray tasks running, switching schedstats off')
switch_schedstats(enabled=False)
sys.exit(0)
def register_a_signal(signum: int, sighandler: Callable) -> None:
"""
Register given sighandler for given signum
"""
try:
signal.signal(signum, sighandler)
logger.info('Registered %s', signum)
except (OSError, ValueError) as e:
logger.info('Skipped %s because of %s', signum, e)
def register_sigterm():
"""
Register a dump handler for SIGTERM signal
"""
register_a_signal(signal.SIGTERM, sigterm_received)
def register_signals(signals: Union[int, Iterable] = None,
handler: Callable = log_on_receive) -> None:
"""
Register given handler for given signal or range of signals
If no signals given, add given handler for all available signals
"""
if signals is None:
# register all available signals
for sig in signal.Signals:
register_a_signal(sig, handler)
else:
if isinstance(signals, int):
# register single signal
register_a_signal(signals, handler)
else:
# register range of signals
for sig in signals:
register_a_signal(sig, handler)
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