210 lines
7.1 KiB
Python
210 lines
7.1 KiB
Python
|
|
# Copyright 2011 OpenStack Foundation.
|
|
# All Rights Reserved.
|
|
# Copyright 2013 Red Hat, Inc.
|
|
#
|
|
# 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 abc
|
|
import logging
|
|
|
|
from oslo.config import cfg
|
|
from stevedore import named
|
|
|
|
from oslo.messaging.openstack.common import timeutils
|
|
from oslo.messaging.openstack.common import uuidutils
|
|
from oslo.messaging import serializer as msg_serializer
|
|
|
|
_notifier_opts = [
|
|
cfg.MultiStrOpt('notification_driver',
|
|
default=[],
|
|
help='Driver or drivers to handle sending notifications'),
|
|
cfg.ListOpt('notification_topics',
|
|
default=['notifications', ],
|
|
deprecated_name='topics',
|
|
deprecated_group='rpc_notifier2',
|
|
help='AMQP topic used for openstack notifications'),
|
|
]
|
|
|
|
_LOG = logging.getLogger(__name__)
|
|
|
|
|
|
class _Driver(object):
|
|
|
|
__metaclass__ = abc.ABCMeta
|
|
|
|
def __init__(self, conf, topics, transport):
|
|
self.conf = conf
|
|
self.topics = topics
|
|
self.transport = transport
|
|
|
|
@abc.abstractmethod
|
|
def notify(self, ctxt, msg, priority):
|
|
pass
|
|
|
|
|
|
class Notifier(object):
|
|
|
|
"""Send notification messages.
|
|
|
|
The Notifier class is used for sending notification messages over a
|
|
messaging transport or other means.
|
|
|
|
Notification messages follow the following format:
|
|
|
|
{'message_id': str(uuid.uuid4()),
|
|
'publisher_id': 'compute.host1',
|
|
'timestamp': timeutils.utcnow(),
|
|
'priority': 'WARN',
|
|
'event_type': 'compute.create_instance',
|
|
'payload': {'instance_id': 12, ... }}
|
|
|
|
A Notifier object can be instantiated with a transport object and a
|
|
publisher ID:
|
|
|
|
notifier = notifier.Notifier(get_transport(CONF), 'compute.host1')
|
|
|
|
and notifications are sent via drivers chosen with the notification_driver
|
|
config option and on the topics consen with the notification_topics config
|
|
option.
|
|
|
|
Alternatively, a Notifier object can be instantiated with a specific
|
|
driver or topic:
|
|
|
|
notifier = notifier.Notifier(RPC_TRANSPORT,
|
|
'compute.host',
|
|
driver='messaging',
|
|
topic='notifications')
|
|
"""
|
|
|
|
def __init__(self, transport, publisher_id,
|
|
driver=None, topic=None,
|
|
serializer=None):
|
|
"""Construct a Notifier object.
|
|
|
|
:param transport: the transport to use for sending messages
|
|
:type transport: oslo.messaging.Transport
|
|
:param publisher_id: field in notifications sent, e.g. 'compute.host1'
|
|
:type publisher_id: str
|
|
:param driver: a driver to lookup from oslo.messaging.notify.drivers
|
|
:type driver: str
|
|
:param topic: the topic which to send messages on
|
|
:type topic: str
|
|
:param serializer: an optional entity serializer
|
|
:type serializer: Serializer
|
|
"""
|
|
self.conf = transport.conf
|
|
self.conf.register_opts(_notifier_opts)
|
|
|
|
self.transport = transport
|
|
self.publisher_id = publisher_id
|
|
|
|
self._driver_names = ([driver] if driver is not None
|
|
else self.conf.notification_driver)
|
|
|
|
self._topics = ([topic] if topic is not None
|
|
else self.conf.notification_topics)
|
|
self._serializer = serializer or msg_serializer.NoOpSerializer()
|
|
|
|
self._driver_mgr = named.NamedExtensionManager(
|
|
'oslo.messaging.notify.drivers',
|
|
names=self._driver_names,
|
|
invoke_on_load=True,
|
|
invoke_args=[self.conf],
|
|
invoke_kwds={
|
|
'topics': self._topics,
|
|
'transport': self.transport,
|
|
},
|
|
)
|
|
|
|
def _notify(self, ctxt, event_type, payload, priority):
|
|
payload = self._serializer.serialize_entity(ctxt, payload)
|
|
|
|
msg = dict(message_id=uuidutils.generate_uuid(),
|
|
publisher_id=self.publisher_id,
|
|
event_type=event_type,
|
|
priority=priority,
|
|
payload=payload,
|
|
timestamp=str(timeutils.utcnow()))
|
|
|
|
def do_notify(ext):
|
|
try:
|
|
ext.obj.notify(ctxt, msg, priority)
|
|
except Exception as e:
|
|
_LOG.exception("Problem '%(e)s' attempting to send to "
|
|
"notification system. Payload=%(payload)s",
|
|
dict(e=e, payload=payload))
|
|
|
|
if self._driver_mgr.extensions:
|
|
self._driver_mgr.map(do_notify)
|
|
|
|
def debug(self, ctxt, event_type, payload):
|
|
"""Send a notification at debug level.
|
|
|
|
:param ctxt: a request context dict
|
|
:type ctxt: dict
|
|
:param event_type: describes the event, e.g. 'compute.create_instance'
|
|
:type event_type: str
|
|
:param payload: the notification payload
|
|
:type payload: dict
|
|
"""
|
|
self._notify(ctxt, event_type, payload, 'DEBUG')
|
|
|
|
def info(self, ctxt, event_type, payload):
|
|
"""Send a notification at info level.
|
|
|
|
:param ctxt: a request context dict
|
|
:type ctxt: dict
|
|
:param event_type: describes the event, e.g. 'compute.create_instance'
|
|
:type event_type: str
|
|
:param payload: the notification payload
|
|
:type payload: dict
|
|
"""
|
|
self._notify(ctxt, event_type, payload, 'INFO')
|
|
|
|
def warn(self, ctxt, event_type, payload):
|
|
"""Send a notification at warning level.
|
|
|
|
:param ctxt: a request context dict
|
|
:type ctxt: dict
|
|
:param event_type: describes the event, e.g. 'compute.create_instance'
|
|
:type event_type: str
|
|
:param payload: the notification payload
|
|
:type payload: dict
|
|
"""
|
|
self._notify(ctxt, event_type, payload, 'WARN')
|
|
|
|
def error(self, ctxt, event_type, payload):
|
|
"""Send a notification at error level.
|
|
|
|
:param ctxt: a request context dict
|
|
:type ctxt: dict
|
|
:param event_type: describes the event, e.g. 'compute.create_instance'
|
|
:type event_type: str
|
|
:param payload: the notification payload
|
|
:type payload: dict
|
|
"""
|
|
self._notify(ctxt, event_type, payload, 'ERROR')
|
|
|
|
def critical(self, ctxt, event_type, payload):
|
|
"""Send a notification at critical level.
|
|
|
|
:param ctxt: a request context dict
|
|
:type ctxt: dict
|
|
:param event_type: describes the event, e.g. 'compute.create_instance'
|
|
:type event_type: str
|
|
:param payload: the notification payload
|
|
:type payload: dict
|
|
"""
|
|
self._notify(ctxt, event_type, payload, 'CRITICAL')
|