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# 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.
import functools
import threading
from oslo_messaging.rpc import dispatcher as rpc_dispatcher
import designate.exceptions
class ExceptionThreadLocal(threading.local):
def __init__(self):
super(ExceptionThreadLocal, self).__init__()
self.depth = 0
def reset_depth(self):
self.depth = 0
def expected_exceptions():
def outer(f):
@functools.wraps(f)
def exception_wrapper(cls, *args, **kwargs):
cls.exception_thread_local.depth += 1
# We only want to wrap the first function wrapped.
if cls.exception_thread_local.depth > 1:
return f(cls, *args, **kwargs)
try:
return f(cls, *args, **kwargs)
except designate.exceptions.DesignateException as e:
if e.expected:
raise rpc_dispatcher.ExpectedException()
raise
finally:
cls.exception_thread_local.reset_depth()
return exception_wrapper
return outer
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