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# -*- coding: utf-8 -*-
#
# Copyright (C) 2012-2016 Red Hat, Inc.
#
# Authors:
# Thomas Woerner <twoerner@redhat.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# 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/>.
"""This module contains decorators for use with and without D-Bus"""
__all__ = ["FirewallDBusException", "handle_exceptions",
"dbus_handle_exceptions", "dbus_service_method"]
import dbus
import dbus.service
import traceback
from dbus.exceptions import DBusException
from decorator import decorator
from firewall import config
from firewall.errors import FirewallError
from firewall import errors
from firewall.core.logger import log
############################################################################
#
# Exception handler decorators
#
############################################################################
class FirewallDBusException(dbus.DBusException):
"""FirewallDBusException"""
_dbus_error_name = "%s.Exception" % config.dbus.DBUS_INTERFACE
@decorator
def handle_exceptions(func, *args, **kwargs):
"""Decorator to handle exceptions and log them. Used if not conneced
to D-Bus.
"""
try:
return func(*args, **kwargs)
except FirewallError as error:
log.debug1(traceback.format_exc())
log.error(error)
except Exception: # pylint: disable=W0703
log.exception()
@decorator
def dbus_handle_exceptions(func, *args, **kwargs):
"""Decorator to handle exceptions, log and report them into D-Bus
:Raises DBusException: on a firewall error code problems.
"""
try:
return func(*args, **kwargs)
except FirewallError as error:
code = FirewallError.get_code(str(error))
if code in [ errors.ALREADY_ENABLED, errors.NOT_ENABLED,
errors.ZONE_ALREADY_SET, errors.ALREADY_SET ]:
log.warning(str(error))
else:
log.debug1(traceback.format_exc())
log.error(str(error))
raise FirewallDBusException(str(error))
except DBusException as ex:
# only log DBusExceptions once
raise ex
except Exception as ex:
log.exception()
raise FirewallDBusException(str(ex))
def dbus_service_method(*args, **kwargs):
"""Add sender argument for D-Bus"""
kwargs.setdefault("sender_keyword", "sender")
return dbus.service.method(*args, **kwargs)