ea8fad47a5
1.As mentioned in [1], we should avoid using six.iteritems to achieve iterators. We can use dict.items instead, as it will return iterators in PY3 as well. And dict.items/keys will more readable. 2.In py2, the performance about list should be negligible, see the link [2]. [1] https://wiki.openstack.org/wiki/Python3 [2] http://lists.openstack.org/pipermail/openstack-dev/2015-June/066391.html Change-Id: Ia235afc3532f62f265f91ca46d2306c72fc2a2a2
138 lines
5.2 KiB
Python
138 lines
5.2 KiB
Python
# Copyright 2014 Rackspace Hosting
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import logging
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from oslo_config import cfg
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from oslo_utils import fnmatch
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from stevedore import dispatch
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import yaml
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from oslo_messaging._i18n import _LI, _LW
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from oslo_messaging.notify import notifier
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LOG = logging.getLogger(__name__)
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router_config = cfg.StrOpt('routing_config', default='',
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deprecated_group='DEFAULT',
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deprecated_name='routing_notifier_config',
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help='RoutingNotifier configuration file location.')
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CONF = cfg.CONF
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CONF.register_opt(router_config, group='oslo_messaging_notifications')
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class RoutingDriver(notifier.Driver):
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NOTIFIER_PLUGIN_NAMESPACE = 'oslo.messaging.notify.drivers'
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plugin_manager = None
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routing_groups = None # The routing groups from the config file.
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used_drivers = None # Used driver names, extracted from config file.
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def _should_load_plugin(self, ext, *args, **kwargs):
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# Hack to keep stevedore from circular importing since these
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# endpoints are used for different purposes.
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if ext.name == 'routing':
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return False
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return ext.name in self.used_drivers
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def _get_notifier_config_file(self, filename):
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"""Broken out for testing."""
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return open(filename, 'r')
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def _load_notifiers(self):
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"""One-time load of notifier config file."""
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self.routing_groups = {}
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self.used_drivers = set()
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filename = CONF.oslo_messaging_notifications.routing_config
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if not filename:
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return
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# Infer which drivers are used from the config file.
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self.routing_groups = yaml.safe_load(
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self._get_notifier_config_file(filename))
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if not self.routing_groups:
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self.routing_groups = {} # In case we got None from load()
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return
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for group in self.routing_groups.values():
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self.used_drivers.update(group.keys())
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LOG.debug('loading notifiers from %s', self.NOTIFIER_PLUGIN_NAMESPACE)
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self.plugin_manager = dispatch.DispatchExtensionManager(
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namespace=self.NOTIFIER_PLUGIN_NAMESPACE,
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check_func=self._should_load_plugin,
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invoke_on_load=True,
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invoke_args=None)
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if not list(self.plugin_manager):
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LOG.warning(_LW("Failed to load any notifiers for %s"),
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self.NOTIFIER_PLUGIN_NAMESPACE)
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def _get_drivers_for_message(self, group, event_type, priority):
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"""Which drivers should be called for this event_type
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or priority.
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"""
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accepted_drivers = set()
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for driver, rules in group.items():
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checks = []
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for key, patterns in rules.items():
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if key == 'accepted_events':
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c = [fnmatch.fnmatch(event_type, p)
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for p in patterns]
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checks.append(any(c))
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if key == 'accepted_priorities':
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c = [fnmatch.fnmatch(priority, p.lower())
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for p in patterns]
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checks.append(any(c))
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if all(checks):
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accepted_drivers.add(driver)
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return list(accepted_drivers)
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def _filter_func(self, ext, context, message, priority, retry,
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accepted_drivers):
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"""True/False if the driver should be called for this message.
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"""
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# context is unused here, but passed in by map()
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return ext.name in accepted_drivers
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def _call_notify(self, ext, context, message, priority, retry,
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accepted_drivers):
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"""Emit the notification.
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"""
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# accepted_drivers is passed in as a result of the map() function
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LOG.info(_LI("Routing '%(event)s' notification to '%(driver)s' "
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"driver"),
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{'event': message.get('event_type'), 'driver': ext.name})
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ext.obj.notify(context, message, priority, retry)
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def notify(self, context, message, priority, retry):
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if not self.plugin_manager:
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self._load_notifiers()
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# Fail if these aren't present ...
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event_type = message['event_type']
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accepted_drivers = set()
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for group in self.routing_groups.values():
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accepted_drivers.update(
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self._get_drivers_for_message(group, event_type,
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priority.lower()))
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self.plugin_manager.map(self._filter_func, self._call_notify, context,
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message, priority, retry,
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list(accepted_drivers))
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