52 lines
1.8 KiB
Python
52 lines
1.8 KiB
Python
# vim: tabstop=4 shiftwidth=4 softtabstop=4
|
|
|
|
# Copyright 2011 OpenStack Foundation.
|
|
# Copyright 2012, Red Hat, Inc.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License"); you may
|
|
# not use this file except in compliance with the License. You may obtain
|
|
# a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
|
|
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
|
|
# License for the specific language governing permissions and limitations
|
|
# under the License.
|
|
|
|
"""
|
|
Exception related utilities.
|
|
"""
|
|
|
|
import contextlib
|
|
import logging
|
|
import sys
|
|
import traceback
|
|
|
|
from quantum.openstack.common.gettextutils import _
|
|
|
|
|
|
@contextlib.contextmanager
|
|
def save_and_reraise_exception():
|
|
"""Save current exception, run some code and then re-raise.
|
|
|
|
In some cases the exception context can be cleared, resulting in None
|
|
being attempted to be re-raised after an exception handler is run. This
|
|
can happen when eventlet switches greenthreads or when running an
|
|
exception handler, code raises and catches an exception. In both
|
|
cases the exception context will be cleared.
|
|
|
|
To work around this, we save the exception state, run handler code, and
|
|
then re-raise the original exception. If another exception occurs, the
|
|
saved exception is logged and the new exception is re-raised.
|
|
"""
|
|
type_, value, tb = sys.exc_info()
|
|
try:
|
|
yield
|
|
except Exception:
|
|
logging.error(_('Original exception being dropped: %s'),
|
|
traceback.format_exception(type_, value, tb))
|
|
raise
|
|
raise type_, value, tb
|