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# Copyright 2011 OpenStack LLC.
# All Rights Reserved.
#
# 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 uuid
from nova.common import cfg
from nova import flags
from nova import utils
from nova import log as logging
LOG = logging.getLogger('nova.exception')
notifier_opts = [
cfg.StrOpt('default_notification_level',
default='INFO',
help='Default notification level for outgoing notifications'),
cfg.StrOpt('default_publisher_id',
default='$host',
help='Default publisher_id for outgoing notifications'),
]
FLAGS = flags.FLAGS
FLAGS.add_options(notifier_opts)
WARN = 'WARN'
INFO = 'INFO'
ERROR = 'ERROR'
CRITICAL = 'CRITICAL'
DEBUG = 'DEBUG'
log_levels = (DEBUG, WARN, INFO, ERROR, CRITICAL)
class BadPriorityException(Exception):
pass
def notify_decorator(name, fn):
""" decorator for notify which is used from utils.monkey_patch()
:param name: name of the function
:param function: - object of the function
:returns: function -- decorated function
"""
def wrapped_func(*args, **kwarg):
body = {}
body['args'] = []
body['kwarg'] = {}
for arg in args:
body['args'].append(arg)
for key in kwarg:
body['kwarg'][key] = kwarg[key]
notify(FLAGS.default_publisher_id,
name,
FLAGS.default_notification_level,
body)
return fn(*args, **kwarg)
return wrapped_func
def publisher_id(service, host=None):
if not host:
host = FLAGS.host
return "%s.%s" % (service, host)
def notify(publisher_id, event_type, priority, payload):
"""
Sends a notification using the specified driver
Notify parameters:
publisher_id - the source worker_type.host of the message
event_type - the literal type of event (ex. Instance Creation)
priority - patterned after the enumeration of Python logging levels in
the set (DEBUG, WARN, INFO, ERROR, CRITICAL)
payload - A python dictionary of attributes
Outgoing message format includes the above parameters, and appends the
following:
message_id - a UUID representing the id for this notification
timestamp - the GMT timestamp the notification was sent at
The composite message will be constructed as a dictionary of the above
attributes, which will then be sent via the transport mechanism defined
by the driver.
Message example:
{'message_id': str(uuid.uuid4()),
'publisher_id': 'compute.host1',
'timestamp': utils.utcnow(),
'priority': 'WARN',
'event_type': 'compute.create_instance',
'payload': {'instance_id': 12, ... }}
"""
if priority not in log_levels:
raise BadPriorityException(
_('%s not in valid priorities' % priority))
# Ensure everything is JSON serializable.
payload = utils.to_primitive(payload, convert_instances=True)
driver = utils.import_object(FLAGS.notification_driver)
msg = dict(message_id=str(uuid.uuid4()),
publisher_id=publisher_id,
event_type=event_type,
priority=priority,
payload=payload,
timestamp=str(utils.utcnow()))
try:
driver.notify(msg)
except Exception, e:
LOG.exception(_("Problem '%(e)s' attempting to "
"send to notification system. Payload=%(payload)s" %
locals()))
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