459 lines
17 KiB
Python
459 lines
17 KiB
Python
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# Copyright 2011 OpenStack Foundation.
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# All Rights Reserved.
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# Copyright 2013 Red Hat, Inc.
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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 abc
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import argparse
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import logging
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import uuid
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from oslo_config import cfg
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from oslo_utils import timeutils
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import six
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from stevedore import extension
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from stevedore import named
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from oslo_messaging import serializer as msg_serializer
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from oslo_messaging import transport as msg_transport
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_notifier_opts = [
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cfg.MultiStrOpt('driver',
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default=[],
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deprecated_name='notification_driver',
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deprecated_group='DEFAULT',
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help='The Drivers(s) to handle sending notifications. '
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'Possible values are messaging, messagingv2, '
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'routing, log, test, noop'),
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cfg.StrOpt('transport_url',
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deprecated_name='notification_transport_url',
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deprecated_group='DEFAULT',
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secret=True,
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help='A URL representing the messaging driver to use for '
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'notifications. If not set, we fall back to the same '
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'configuration used for RPC.'),
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cfg.ListOpt('topics',
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default=['notifications', ],
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deprecated_opts=[
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cfg.DeprecatedOpt('topics',
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group='rpc_notifier2'),
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cfg.DeprecatedOpt('notification_topics',
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group='DEFAULT')
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],
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help='AMQP topic used for OpenStack notifications.'),
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cfg.IntOpt('retry', default=-1,
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help='The maximum number of attempts to re-send a notification '
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'message which failed to be delivered due to a '
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'recoverable error. 0 - No retry, -1 - indefinite'),
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]
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_LOG = logging.getLogger(__name__)
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def _send_notification():
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"""Command line tool to send notifications manually."""
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parser = argparse.ArgumentParser(
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description='Oslo.messaging notification sending',
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)
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parser.add_argument('--config-file',
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help='Path to configuration file')
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parser.add_argument('--transport-url',
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help='Transport URL')
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parser.add_argument('--publisher-id',
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help='Publisher ID')
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parser.add_argument('--event-type',
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default="test",
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help="Event type")
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parser.add_argument('--topic',
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nargs='*',
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help="Topic to send to")
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parser.add_argument('--priority',
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default="info",
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choices=("info",
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"audit",
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"warn",
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"error",
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"critical",
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"sample"),
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help='Event type')
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parser.add_argument('--driver',
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default="messagingv2",
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choices=extension.ExtensionManager(
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'oslo.messaging.notify.drivers'
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).names(),
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help='Notification driver')
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parser.add_argument('payload',
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help="the notification payload (dict)")
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args = parser.parse_args()
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conf = cfg.ConfigOpts()
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conf([],
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default_config_files=[args.config_file] if args.config_file else None)
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transport = get_notification_transport(conf, url=args.transport_url)
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notifier = Notifier(transport, args.publisher_id, topics=args.topic,
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driver=args.driver)
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notifier._notify({}, args.event_type, args.payload, args.priority)
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@six.add_metaclass(abc.ABCMeta)
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class Driver(object):
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"""Base driver for Notifications"""
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def __init__(self, conf, topics, transport):
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"""base driver initialization
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:param conf: configuration options
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:param topics: list of topics
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:param transport: transport driver to use
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"""
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self.conf = conf
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self.topics = topics
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self.transport = transport
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@abc.abstractmethod
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def notify(self, ctxt, msg, priority, retry):
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"""send a single notification with a specific priority
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:param ctxt: current request context
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:param msg: message to be sent
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:type msg: str
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:param priority: priority of the message
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:type priority: str
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:param retry: connection retries configuration (used by the messaging
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driver):
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None or -1 means to retry forever.
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0 means no retry is attempted.
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N means attempt at most N retries.
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:type retry: int
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"""
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pass
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def get_notification_transport(conf, url=None, allowed_remote_exmods=None):
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"""A factory method for Transport objects for notifications.
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This method should be used for notifications, in case notifications are
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being sent over a different message bus than normal messaging
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functionality; for example, using a different driver, or with different
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access permissions.
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If no transport URL is provided, the URL in the notifications section of
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the config file will be used. If that URL is also absent, the same
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transport as specified in the messaging section will be used.
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If a transport URL is provided, then this function works exactly the same
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as get_transport.
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:param conf: the user configuration
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:type conf: cfg.ConfigOpts
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:param url: a transport URL, see :py:class:`transport.TransportURL`
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:type url: str or TransportURL
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:param allowed_remote_exmods: a list of modules which a client using this
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transport will deserialize remote exceptions
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from
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:type allowed_remote_exmods: list
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"""
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conf.register_opts(_notifier_opts,
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group='oslo_messaging_notifications')
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if url is None:
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url = conf.oslo_messaging_notifications.transport_url
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return msg_transport._get_transport(
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conf, url, allowed_remote_exmods,
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transport_cls=msg_transport.NotificationTransport)
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class Notifier(object):
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"""Send notification messages.
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The Notifier class is used for sending notification messages over a
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messaging transport or other means.
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Notification messages follow the following format::
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{'message_id': six.text_type(uuid.uuid4()),
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'publisher_id': 'compute.host1',
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'timestamp': timeutils.utcnow(),
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'priority': 'WARN',
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'event_type': 'compute.create_instance',
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'payload': {'instance_id': 12, ... }}
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A Notifier object can be instantiated with a transport object and a
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publisher ID:
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notifier = messaging.Notifier(get_notification_transport(CONF),
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'compute')
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and notifications are sent via drivers chosen with the driver
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config option and on the topics chosen with the topics config
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option in [oslo_messaging_notifications] section.
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Alternatively, a Notifier object can be instantiated with a specific
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driver or topic::
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transport = notifier.get_notification_transport(CONF)
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notifier = notifier.Notifier(transport,
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'compute.host',
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driver='messaging',
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topics=['notifications'])
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Notifier objects are relatively expensive to instantiate (mostly the cost
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of loading notification drivers), so it is possible to specialize a given
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Notifier object with a different publisher id using the prepare() method::
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notifier = notifier.prepare(publisher_id='compute')
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notifier.info(ctxt, event_type, payload)
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"""
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def __init__(self, transport, publisher_id=None,
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driver=None, serializer=None, retry=None,
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topics=None):
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"""Construct a Notifier object.
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:param transport: the transport to use for sending messages
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:type transport: oslo_messaging.Transport
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:param publisher_id: field in notifications sent, for example
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'compute.host1'
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:type publisher_id: str
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:param driver: a driver to lookup from oslo_messaging.notify.drivers
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:type driver: str
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:param serializer: an optional entity serializer
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:type serializer: Serializer
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:param retry: connection retries configuration (used by the messaging
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driver):
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None or -1 means to retry forever.
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0 means no retry is attempted.
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N means attempt at most N retries.
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:type retry: int
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:param topics: the topics which to send messages on
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:type topics: list of strings
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"""
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conf = transport.conf
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conf.register_opts(_notifier_opts,
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group='oslo_messaging_notifications')
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if not isinstance(transport, msg_transport.NotificationTransport):
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_LOG.warning("Using RPC transport for notifications. Please use "
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"get_notification_transport to obtain a "
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"notification transport instance.")
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self.transport = transport
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self.publisher_id = publisher_id
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if retry is not None:
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self.retry = retry
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else:
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self.retry = conf.oslo_messaging_notifications.retry
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self._driver_names = ([driver] if driver is not None else
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conf.oslo_messaging_notifications.driver)
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if topics is not None:
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self._topics = topics
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else:
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self._topics = conf.oslo_messaging_notifications.topics
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self._serializer = serializer or msg_serializer.NoOpSerializer()
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self._driver_mgr = named.NamedExtensionManager(
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'oslo.messaging.notify.drivers',
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names=self._driver_names,
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invoke_on_load=True,
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invoke_args=[conf],
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invoke_kwds={
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'topics': self._topics,
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'transport': self.transport,
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}
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)
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_marker = object()
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def prepare(self, publisher_id=_marker, retry=_marker):
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"""Return a specialized Notifier instance.
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Returns a new Notifier instance with the supplied publisher_id. Allows
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sending notifications from multiple publisher_ids without the overhead
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of notification driver loading.
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:param publisher_id: field in notifications sent, for example
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'compute.host1'
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:type publisher_id: str
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:param retry: connection retries configuration (used by the messaging
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driver):
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None or -1 means to retry forever.
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0 means no retry is attempted.
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N means attempt at most N retries.
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:type retry: int
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"""
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return _SubNotifier._prepare(self, publisher_id, retry=retry)
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def _notify(self, ctxt, event_type, payload, priority, publisher_id=None,
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retry=None):
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payload = self._serializer.serialize_entity(ctxt, payload)
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ctxt = self._serializer.serialize_context(ctxt)
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msg = dict(message_id=six.text_type(uuid.uuid4()),
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publisher_id=publisher_id or self.publisher_id,
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event_type=event_type,
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priority=priority,
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payload=payload,
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timestamp=six.text_type(timeutils.utcnow()))
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def do_notify(ext):
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try:
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ext.obj.notify(ctxt, msg, priority, retry or self.retry)
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except Exception as e:
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_LOG.exception("Problem '%(e)s' attempting to send to "
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"notification system. Payload=%(payload)s",
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{'e': e, 'payload': payload})
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if self._driver_mgr.extensions:
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self._driver_mgr.map(do_notify)
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def audit(self, ctxt, event_type, payload):
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"""Send a notification at audit level.
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:param ctxt: a request context dict
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:type ctxt: dict
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:param event_type: describes the event, for example
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'compute.create_instance'
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:type event_type: str
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:param payload: the notification payload
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:type payload: dict
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:raises: MessageDeliveryFailure
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"""
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self._notify(ctxt, event_type, payload, 'AUDIT')
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def debug(self, ctxt, event_type, payload):
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"""Send a notification at debug level.
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:param ctxt: a request context dict
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:type ctxt: dict
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:param event_type: describes the event, for example
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'compute.create_instance'
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:type event_type: str
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:param payload: the notification payload
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:type payload: dict
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:raises: MessageDeliveryFailure
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"""
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self._notify(ctxt, event_type, payload, 'DEBUG')
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def info(self, ctxt, event_type, payload):
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"""Send a notification at info level.
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:param ctxt: a request context dict
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:type ctxt: dict
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:param event_type: describes the event, for example
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'compute.create_instance'
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:type event_type: str
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:param payload: the notification payload
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:type payload: dict
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:raises: MessageDeliveryFailure
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"""
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self._notify(ctxt, event_type, payload, 'INFO')
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def warn(self, ctxt, event_type, payload):
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"""Send a notification at warning level.
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:param ctxt: a request context dict
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:type ctxt: dict
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:param event_type: describes the event, for example
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'compute.create_instance'
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:type event_type: str
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:param payload: the notification payload
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:type payload: dict
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:raises: MessageDeliveryFailure
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"""
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self._notify(ctxt, event_type, payload, 'WARN')
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warning = warn
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def error(self, ctxt, event_type, payload):
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"""Send a notification at error level.
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:param ctxt: a request context dict
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:type ctxt: dict
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:param event_type: describes the event, for example
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'compute.create_instance'
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:type event_type: str
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:param payload: the notification payload
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:type payload: dict
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:raises: MessageDeliveryFailure
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"""
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self._notify(ctxt, event_type, payload, 'ERROR')
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def critical(self, ctxt, event_type, payload):
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"""Send a notification at critical level.
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:param ctxt: a request context dict
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:type ctxt: dict
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:param event_type: describes the event, for example
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'compute.create_instance'
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:type event_type: str
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:param payload: the notification payload
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:type payload: dict
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:raises: MessageDeliveryFailure
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"""
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self._notify(ctxt, event_type, payload, 'CRITICAL')
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def sample(self, ctxt, event_type, payload):
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"""Send a notification at sample level.
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Sample notifications are for high-frequency events
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that typically contain small payloads. eg: "CPU = 70%"
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Not all drivers support the sample level
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(log, for example) so these could be dropped.
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:param ctxt: a request context dict
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:type ctxt: dict
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:param event_type: describes the event, for example
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'compute.create_instance'
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:type event_type: str
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:param payload: the notification payload
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:type payload: dict
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:raises: MessageDeliveryFailure
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"""
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self._notify(ctxt, event_type, payload, 'SAMPLE')
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def is_enabled(self):
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"""Check if the notifier will emit notifications anywhere.
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:return: false if the driver of the notifier is set only to noop, true
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otherwise
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"""
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return self._driver_mgr.names() != ['noop']
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class _SubNotifier(Notifier):
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_marker = Notifier._marker
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def __init__(self, base, publisher_id, retry):
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self._base = base
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self.transport = base.transport
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self.publisher_id = publisher_id
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self.retry = retry
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self._serializer = self._base._serializer
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self._driver_mgr = self._base._driver_mgr
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def _notify(self, ctxt, event_type, payload, priority):
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super(_SubNotifier, self)._notify(ctxt, event_type, payload, priority)
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@classmethod
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def _prepare(cls, base, publisher_id=_marker, retry=_marker):
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if publisher_id is cls._marker:
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publisher_id = base.publisher_id
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if retry is cls._marker:
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retry = base.retry
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return cls(base, publisher_id, retry=retry)
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