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Dir : ~/lib/python3/dist-packages/cloudinit/
View File Name : signal_handler.py

# Copyright (C) 2012 Canonical Ltd.
# Copyright (C) 2012 Yahoo! Inc.
#
# Author: Scott Moser <scott.moser@canonical.com>
# Author: Joshua Harlow <harlowja@yahoo-inc.com>
#
# This file is part of cloud-init. See LICENSE file for license information.
import inspect
import logging
import signal
import sys
import types
from io import StringIO
from typing import Callable, Dict, Final, Union

from cloudinit import version as vr
from cloudinit.log import log_util

LOG = logging.getLogger(__name__)

SIG_MESSAGE: Final = "Cloud-init {} received {}, exiting\n"
BACK_FRAME_TRACE_DEPTH: Final = 3
SIGNALS: Final[Dict[int, str]] = {
    signal.SIGINT: "Cloud-init %(version)s received SIGINT, exiting",
    signal.SIGTERM: "Cloud-init %(version)s received SIGTERM, exiting",
    signal.SIGABRT: "Cloud-init %(version)s received SIGABRT, exiting",
}


def inspect_handler(sig: Union[int, Callable, None]) -> None:
    """inspect_handler() logs signal handler state"""
    if callable(sig):
        # only produce a log when the signal handler isn't in the expected
        # default state
        if not isinstance(sig, types.BuiltinFunctionType):
            LOG.info("Signal state [%s] - previously custom handler.", sig)
    elif sig == signal.SIG_IGN:
        LOG.info("Signal state [SIG_IGN] - previously ignored.")
    elif sig is None:
        LOG.info("Signal state [None] - previously not installed from Python.")
    elif sig == signal.SIG_DFL:
        LOG.info(
            "Signal state [%s] - default way of handling signal was "
            "previously in use.",
            sig,
        )
    else:
        # this should never happen, unless something in Python changes
        # https://docs.python.org/3/library/signal.html#signal.getsignal
        LOG.warning("Signal state [%s(%s)] - unknown", type(sig), sig)


def _pprint_frame(frame, depth, max_depth, contents):
    if depth > max_depth or not frame:
        return
    frame_info = inspect.getframeinfo(frame)
    prefix = " " * (depth * 2)
    contents.write("%sFilename: %s\n" % (prefix, frame_info.filename))
    contents.write("%sFunction: %s\n" % (prefix, frame_info.function))
    contents.write("%sLine number: %s\n" % (prefix, frame_info.lineno))
    _pprint_frame(frame.f_back, depth + 1, max_depth, contents)


def _handle_exit(signum, frame):
    # in practice we always receive a Signals object but int is possible
    name = signum.name if isinstance(signum, signal.Signals) else signum
    contents = StringIO(SIG_MESSAGE.format(vr.version_string(), name))
    _pprint_frame(frame, 1, BACK_FRAME_TRACE_DEPTH, contents)
    log_util.multi_log(
        f"Received signal {name} resulting in exit. Cause:\n"
        + contents.getvalue(),
        log=LOG,
        log_level=logging.INFO,
    )
    sys.exit(0)


def attach_handlers():
    """attach cloud-init's handlers"""
    sigs_attached = 0
    for signum in SIGNALS.keys():
        inspect_handler(signal.signal(signum, _handle_exit))
    sigs_attached += len(SIGNALS)
    return sigs_attached