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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 collections
import functools
import itertools
import threading
from oslo_log import log as logging
from designate import context as designate_context
from designate import notifications
LOG = logging.getLogger(__name__)
class NotificationThreadLocal(threading.local):
def __init__(self):
super(NotificationThreadLocal, self).__init__()
self.stack = 0
self.queue = collections.deque()
def reset_queue(self):
self.queue.clear()
def notify_type(notification_type):
def outer(f):
@functools.wraps(f)
def notification_wrapper(cls, *args, **kwargs):
cls.notification_thread_local.stack += 1
context = None
for arg in itertools.chain(args, kwargs.values()):
if isinstance(arg, designate_context.DesignateContext):
context = arg
break
try:
result = f(cls, *args, **kwargs)
payloads = notifications.get_plugin().emit(
notification_type, context, result, args, kwargs
)
for payload in payloads:
LOG.debug(
'Queueing notification for %(type)s',
{
'type': notification_type
}
)
cls.notification_thread_local.queue.appendleft(
(context, notification_type, payload,)
)
return result
finally:
cls.notification_thread_local.stack -= 1
if cls.notification_thread_local.stack == 0:
LOG.debug(
'Emitting %(count)d notifications',
{
'count': len(cls.notification_thread_local.queue)
}
)
for message in cls.notification_thread_local.queue:
LOG.debug(
'Emitting %(type)s notification',
{
'type': message[1]
}
)
cls.notifier.info(message[0], message[1], message[2])
cls.notification_thread_local.reset_queue()
return notification_wrapper
return outer
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