34fd61bdc2
Update all .py source files by
$ pyupgrade --py3-only $(git ls-files | grep ".py$")
to modernize the code according to Python 3 syntaxes.
pep8 errors are fixed by
$ autopep8 --select=E127,E128,E501 --max-line-length 79 -r \
--in-place oslo_messaging
and a few manual adjustments.
Also add the pyupgrade hook to pre-commit to avoid merging additional
Python 2 syntaxes.
Change-Id: I8115b7f8c5d27ce935e4422c351add4bb72e354f
137 lines
5.1 KiB
Python
137 lines
5.1 KiB
Python
# Copyright 2014 Rackspace Hosting
|
|
# All Rights Reserved.
|
|
#
|
|
# 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 fnmatch
|
|
import logging
|
|
|
|
from oslo_config import cfg
|
|
from stevedore import dispatch
|
|
import yaml
|
|
|
|
from oslo_messaging.notify import notifier
|
|
|
|
|
|
LOG = logging.getLogger(__name__)
|
|
|
|
router_config = cfg.StrOpt('routing_config', default='',
|
|
deprecated_group='DEFAULT',
|
|
deprecated_name='routing_notifier_config',
|
|
help='RoutingNotifier configuration file location.')
|
|
|
|
CONF = cfg.CONF
|
|
CONF.register_opt(router_config, group='oslo_messaging_notifications')
|
|
|
|
|
|
class RoutingDriver(notifier.Driver):
|
|
NOTIFIER_PLUGIN_NAMESPACE = 'oslo.messaging.notify.drivers'
|
|
|
|
plugin_manager = None
|
|
routing_groups = None # The routing groups from the config file.
|
|
used_drivers = None # Used driver names, extracted from config file.
|
|
|
|
def _should_load_plugin(self, ext, *args, **kwargs):
|
|
# Hack to keep stevedore from circular importing since these
|
|
# endpoints are used for different purposes.
|
|
if ext.name == 'routing':
|
|
return False
|
|
return ext.name in self.used_drivers
|
|
|
|
def _get_notifier_config_file(self, filename):
|
|
"""Broken out for testing."""
|
|
return open(filename)
|
|
|
|
def _load_notifiers(self):
|
|
"""One-time load of notifier config file."""
|
|
self.routing_groups = {}
|
|
self.used_drivers = set()
|
|
filename = CONF.oslo_messaging_notifications.routing_config
|
|
if not filename:
|
|
return
|
|
|
|
# Infer which drivers are used from the config file.
|
|
self.routing_groups = yaml.safe_load(
|
|
self._get_notifier_config_file(filename))
|
|
if not self.routing_groups:
|
|
self.routing_groups = {} # In case we got None from load()
|
|
return
|
|
|
|
for group in self.routing_groups.values():
|
|
self.used_drivers.update(group.keys())
|
|
|
|
LOG.debug('loading notifiers from %s', self.NOTIFIER_PLUGIN_NAMESPACE)
|
|
self.plugin_manager = dispatch.DispatchExtensionManager(
|
|
namespace=self.NOTIFIER_PLUGIN_NAMESPACE,
|
|
check_func=self._should_load_plugin,
|
|
invoke_on_load=True,
|
|
invoke_args=None)
|
|
if not list(self.plugin_manager):
|
|
LOG.warning("Failed to load any notifiers for %s",
|
|
self.NOTIFIER_PLUGIN_NAMESPACE)
|
|
|
|
def _get_drivers_for_message(self, group, event_type, priority):
|
|
"""Which drivers should be called for this event_type
|
|
or priority.
|
|
"""
|
|
accepted_drivers = set()
|
|
|
|
for driver, rules in group.items():
|
|
checks = []
|
|
for key, patterns in rules.items():
|
|
if key == 'accepted_events':
|
|
c = [fnmatch.fnmatch(event_type, p)
|
|
for p in patterns]
|
|
checks.append(any(c))
|
|
if key == 'accepted_priorities':
|
|
c = [fnmatch.fnmatch(priority, p.lower())
|
|
for p in patterns]
|
|
checks.append(any(c))
|
|
if all(checks):
|
|
accepted_drivers.add(driver)
|
|
|
|
return list(accepted_drivers)
|
|
|
|
def _filter_func(self, ext, context, message, priority, retry,
|
|
accepted_drivers):
|
|
"""True/False if the driver should be called for this message.
|
|
"""
|
|
# context is unused here, but passed in by map()
|
|
return ext.name in accepted_drivers
|
|
|
|
def _call_notify(self, ext, context, message, priority, retry,
|
|
accepted_drivers):
|
|
"""Emit the notification.
|
|
"""
|
|
# accepted_drivers is passed in as a result of the map() function
|
|
LOG.info("Routing '%(event)s' notification to '%(driver)s' "
|
|
"driver",
|
|
{'event': message.get('event_type'), 'driver': ext.name})
|
|
ext.obj.notify(context, message, priority, retry)
|
|
|
|
def notify(self, context, message, priority, retry):
|
|
if not self.plugin_manager:
|
|
self._load_notifiers()
|
|
|
|
# Fail if these aren't present ...
|
|
event_type = message['event_type']
|
|
|
|
accepted_drivers = set()
|
|
for group in self.routing_groups.values():
|
|
accepted_drivers.update(
|
|
self._get_drivers_for_message(group, event_type,
|
|
priority.lower()))
|
|
self.plugin_manager.map(self._filter_func, self._call_notify, context,
|
|
message, priority, retry,
|
|
list(accepted_drivers))
|