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Viewing: signal_handler.py

# vi: ts=4 expandtab
#
#    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 program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License version 3, as
#    published by the Free Software Foundation.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.

import inspect
import signal
import sys

from StringIO import StringIO

from cloudinit import log as logging
from cloudinit import util
from cloudinit import version as vr

LOG = logging.getLogger(__name__)


BACK_FRAME_TRACE_DEPTH = 3
EXIT_FOR = {
    signal.SIGINT: ('Cloud-init %(version)s received SIGINT, exiting...', 1),
    signal.SIGTERM: ('Cloud-init %(version)s received SIGTERM, exiting...', 1),
    # Can't be caught...
    # signal.SIGKILL: ('Cloud-init killed, exiting...', 1),
    signal.SIGABRT: ('Cloud-init %(version)s received SIGABRT, exiting...', 1),
}


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):
    (msg, rc) = EXIT_FOR[signum]
    msg = msg % ({'version': vr.version()})
    contents = StringIO()
    contents.write("%s\n" % (msg))
    _pprint_frame(frame, 1, BACK_FRAME_TRACE_DEPTH, contents)
    util.multi_log(contents.getvalue(),
                   console=True, stderr=False, log=LOG)
    sys.exit(rc)


def attach_handlers():
    sigs_attached = 0
    for signum in EXIT_FOR.keys():
        signal.signal(signum, _handle_exit)
    sigs_attached += len(EXIT_FOR)
    return sigs_attached
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