99 lines
3.0 KiB
Python
99 lines
3.0 KiB
Python
# Copyright 2011 OpenStack LLC.
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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 uuid
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from nova import flags
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from nova import utils
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from nova import log as logging
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LOG = logging.getLogger('nova.exception')
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FLAGS = flags.FLAGS
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flags.DEFINE_string('default_notification_level', 'INFO',
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'Default notification level for outgoing notifications')
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WARN = 'WARN'
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INFO = 'INFO'
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ERROR = 'ERROR'
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CRITICAL = 'CRITICAL'
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DEBUG = 'DEBUG'
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log_levels = (DEBUG, WARN, INFO, ERROR, CRITICAL)
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class BadPriorityException(Exception):
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pass
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def publisher_id(service, host=None):
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if not host:
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host = FLAGS.host
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return "%s.%s" % (service, host)
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def notify(publisher_id, event_type, priority, payload):
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"""
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Sends a notification using the specified driver
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Notify parameters:
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publisher_id - the source worker_type.host of the message
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event_type - the literal type of event (ex. Instance Creation)
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priority - patterned after the enumeration of Python logging levels in
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the set (DEBUG, WARN, INFO, ERROR, CRITICAL)
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payload - A python dictionary of attributes
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Outgoing message format includes the above parameters, and appends the
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following:
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message_id - a UUID representing the id for this notification
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timestamp - the GMT timestamp the notification was sent at
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The composite message will be constructed as a dictionary of the above
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attributes, which will then be sent via the transport mechanism defined
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by the driver.
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Message example:
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{'message_id': str(uuid.uuid4()),
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'publisher_id': 'compute.host1',
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'timestamp': utils.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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"""
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if priority not in log_levels:
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raise BadPriorityException(
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_('%s not in valid priorities' % priority))
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# Ensure everything is JSON serializable.
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payload = utils.to_primitive(payload, convert_instances=True)
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driver = utils.import_object(FLAGS.notification_driver)
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msg = dict(message_id=str(uuid.uuid4()),
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publisher_id=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=str(utils.utcnow()))
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try:
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driver.notify(msg)
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except Exception, e:
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LOG.exception(_("Problem '%(e)s' attempting to "
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"send to notification system." % locals()))
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