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tools.py

# -*- 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)

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2025-05-01 06:30:54
..	dir	-	root/root	0755	2025-05-01 06:30:54
__pycache__	dir	-	root/root	0755	2025-05-01 06:31:08
__init__.py	text/plain	171 B	root/root	0644	2025-04-10 08:42:28
constants.py	text/x-script.python	915 B	root/root	0644	2025-04-10 08:42:28
exceptions.py	text/x-script.python	1.26 KB	root/root	0644	2025-04-10 08:42:28
mailer.py	text/x-script.python	5.39 KB	root/root	0644	2025-04-10 08:42:28
tools.py	text/x-script.python	2.26 KB	root/root	0644	2025-04-10 08:42:28
utils.py	text/x-script.python	15.53 KB	root/root	0644	2025-04-10 08:42:28

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