6b20fa8597
1. Use translation marker functions, their argument must just be a string 2. Any message with more than one variable should use named interpolation instead of positional to allow translators to move the variables around in the string to account for differences in grammar and writing direction. 3. String interpolation should be delayed to be handled by the logging code, rather than being done at the point of the logging call. For more details, please refert to oslo.i18n guideline [1] Note: this commit doesn't touch test code. [1] http://docs.openstack.org/developer/oslo.i18n/guidelines.html Change-Id: I5f013d65b20396bbe0e5a2cceaed2a33fad1af23
366 lines
13 KiB
Python
366 lines
13 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 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 named
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from oslo_messaging._i18n import _LE
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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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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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]
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_LOG = logging.getLogger(__name__)
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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: an connection retries configuration
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None or -1 means to retry forever
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0 means no retry
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N means 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,
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allowed_remote_exmods=None, aliases=None):
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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(conf, url,
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allowed_remote_exmods, aliases)
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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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topic='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, topic=None,
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serializer=None, retry=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 topic: the topic which to send messages on
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:type topic: str
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:param serializer: an optional entity serializer
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:type serializer: Serializer
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:param retry: an connection retries configuration
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None or -1 means to retry forever
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0 means no retry
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N means N retries
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:type retry: int
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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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self.transport = transport
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self.publisher_id = publisher_id
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self.retry = 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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self._topics = ([topic] if topic is not None else
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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: an connection retries configuration
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None or -1 means to retry forever
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0 means no retry
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N means 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(_LE("Problem '%(e)s' attempting to send to "
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"notification system. Payload=%(payload)s"),
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dict(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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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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