137 lines
5.0 KiB
Python
137 lines
5.0 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 fnmatch
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import logging
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from oslo.config import cfg
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import six
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from stevedore import dispatch
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import yaml
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from oslo.messaging.notify import notifier
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from oslo.messaging.openstack.common.gettextutils import _ # noqa
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LOG = logging.getLogger(__name__)
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router_config = cfg.StrOpt('routing_notifier_config', default='',
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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)
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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 file(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.routing_notifier_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.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 %(namespace)s') %
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{'namespace': 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(_("Failed to load any notifiers "
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"for %(namespace)s") %
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{'namespace': 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 six.iteritems(group):
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checks = []
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for key, patterns in six.iteritems(rules):
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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, 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, 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(_("Routing '%(event)s' notification to '%(driver)s' driver") %
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{'event': message.get('event_type'), 'driver': ext.name})
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ext.obj.notify(context, message)
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def notify(self, context, message):
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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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priority = message['priority'].lower()
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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(self._get_drivers_for_message(group,
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event_type,
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priority))
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self.plugin_manager.map(self._filter_func, self._call_notify, context,
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message, list(accepted_drivers))
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