/
notifications.py
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/
notifications.py
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# Copyright 2013 IBM Corp.
#
# 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.
"""Notifications module for OpenStack Identity Service resources"""
import logging
import socket
from oslo.config import cfg
from oslo import messaging
import pycadf
from pycadf import cadftaxonomy as taxonomy
from pycadf import cadftype
from pycadf import eventfactory
from pycadf import resource
from keystone.i18n import _
from keystone.openstack.common import log
notifier_opts = [
cfg.StrOpt('default_publisher_id',
help='Default publisher_id for outgoing notifications'),
]
LOG = log.getLogger(__name__)
# NOTE(gyee): actions that can be notified. One must update this list whenever
# a new action is supported.
ACTIONS = frozenset(['created', 'deleted', 'disabled', 'updated'])
# resource types that can be notified
_SUBSCRIBERS = {}
_notifier = None
CONF = cfg.CONF
CONF.register_opts(notifier_opts)
class ManagerNotificationWrapper(object):
"""Send event notifications for ``Manager`` methods.
Sends a notification if the wrapped Manager method does not raise an
``Exception`` (such as ``keystone.exception.NotFound``).
:param operation: one of the values from ACTIONS
:param resource_type: type of resource being affected
:param public: If True (default), the event will be sent to the notifier
API. If False, the event will only be sent via
notify_event_callbacks to in process listeners
"""
def __init__(self, operation, resource_type, public=True,
resource_id_arg_index=1, result_id_arg_attr=None):
self.operation = operation
self.resource_type = resource_type
self.public = public
self.resource_id_arg_index = resource_id_arg_index
self.result_id_arg_attr = result_id_arg_attr
def __call__(self, f):
def wrapper(*args, **kwargs):
"""Send a notification if the wrapped callable is successful."""
try:
result = f(*args, **kwargs)
except Exception:
raise
else:
if self.result_id_arg_attr is not None:
resource_id = result[self.result_id_arg_attr]
else:
resource_id = args[self.resource_id_arg_index]
_send_notification(
self.operation,
self.resource_type,
resource_id,
public=self.public)
return result
return wrapper
def created(*args, **kwargs):
"""Decorator to send notifications for ``Manager.create_*`` methods."""
return ManagerNotificationWrapper('created', *args, **kwargs)
def updated(*args, **kwargs):
"""Decorator to send notifications for ``Manager.update_*`` methods."""
return ManagerNotificationWrapper('updated', *args, **kwargs)
def disabled(*args, **kwargs):
"""Decorator to send notifications when an object is disabled."""
return ManagerNotificationWrapper('disabled', *args, **kwargs)
def deleted(*args, **kwargs):
"""Decorator to send notifications for ``Manager.delete_*`` methods."""
return ManagerNotificationWrapper('deleted', *args, **kwargs)
def _get_callback_info(callback):
if getattr(callback, 'im_class', None):
return [getattr(callback, '__module__', None),
callback.im_class.__name__,
callback.__name__]
else:
return [getattr(callback, '__module__', None), callback.__name__]
def register_event_callback(event, resource_type, callbacks):
if event not in ACTIONS:
raise ValueError(_('%(event)s is not a valid notification event, must '
'be one of: %(actions)s') %
{'event': event, 'actions': ', '.join(ACTIONS)})
if not hasattr(callbacks, '__iter__'):
callbacks = [callbacks]
for callback in callbacks:
if not callable(callback):
msg = _('Method not callable: %s') % callback
LOG.error(msg)
raise TypeError(msg)
_SUBSCRIBERS.setdefault(event, {}).setdefault(resource_type, set())
_SUBSCRIBERS[event][resource_type].add(callback)
if LOG.logger.getEffectiveLevel() <= logging.INFO:
# Do this only if its going to appear in the logs.
msg = _('Callback: `%(callback)s` subscribed to event '
'`%(event)s`.')
callback_info = _get_callback_info(callback)
callback_str = '.'.join(i for i in callback_info if i is not None)
event_str = '.'.join(['identity', resource_type, event])
LOG.info(msg, {'callback': callback_str, 'event': event_str})
def notify_event_callbacks(service, resource_type, operation, payload):
"""Sends a notification to registered extensions."""
if operation in _SUBSCRIBERS:
if resource_type in _SUBSCRIBERS[operation]:
for cb in _SUBSCRIBERS[operation][resource_type]:
subst_dict = {'cb_name': cb.__name__,
'service': service,
'resource_type': resource_type,
'operation': operation,
'payload': payload}
LOG.debug(('Invoking callback %(cb_name)s for event '
'%(service)s %(resource_type)s %(operation)s for'
'%(payload)s'), subst_dict)
cb(service, resource_type, operation, payload)
def _get_notifier():
"""Return a notifier object.
If _notifier is None it means that a notifier object has not been set.
If _notifier is False it means that a notifier has previously failed to
construct.
Otherwise it is a constructed Notifier object.
"""
global _notifier
if _notifier is None:
host = CONF.default_publisher_id or socket.gethostname()
try:
transport = messaging.get_transport(CONF)
_notifier = messaging.Notifier(transport, "identity.%s" % host)
except Exception:
LOG.exception("Failed to construct notifier")
_notifier = False
return _notifier
def clear_subscribers():
_SUBSCRIBERS.clear()
def reset_notifier():
global _notifier
_notifier = None
def _send_notification(operation, resource_type, resource_id, public=True):
"""Send notification to inform observers about the affected resource.
This method doesn't raise an exception when sending the notification fails.
:param operation: operation being performed (created, updated, or deleted)
:param resource_type: type of resource being operated on
:param resource_id: ID of resource being operated on
:param public: if True (default), the event will be sent
to the notifier API.
if False, the event will only be sent via
notify_event_callbacks to in process listeners.
"""
payload = {'resource_info': resource_id}
service = 'identity'
notify_event_callbacks(service, resource_type, operation, payload)
if public:
notifier = _get_notifier()
if notifier:
context = {}
event_type = '%(service)s.%(resource_type)s.%(operation)s' % {
'service': service,
'resource_type': resource_type,
'operation': operation}
try:
notifier.info(context, event_type, payload)
except Exception:
LOG.exception(_(
'Failed to send %(res_id)s %(event_type)s notification'),
{'res_id': resource_id, 'event_type': event_type})
class CadfNotificationWrapper(object):
"""Send CADF event notifications for various methods.
Sends CADF notifications for events such as whether an authentication was
successful or not.
"""
def __init__(self, action):
self.action = action
def __call__(self, f):
def wrapper(wrapped_self, context, user_id, *args, **kwargs):
"""Always send a notification."""
remote_addr = None
http_user_agent = None
environment = context.get('environment')
if environment:
remote_addr = environment.get('REMOTE_ADDR')
http_user_agent = environment.get('HTTP_USER_AGENT')
host = pycadf.host.Host(address=remote_addr, agent=http_user_agent)
initiator = resource.Resource(typeURI=taxonomy.ACCOUNT_USER,
name=user_id, host=host)
_send_audit_notification(self.action, initiator,
taxonomy.OUTCOME_PENDING)
try:
result = f(wrapped_self, context, user_id, *args, **kwargs)
except Exception:
# For authentication failure send a cadf event as well
_send_audit_notification(self.action, initiator,
taxonomy.OUTCOME_FAILURE)
raise
else:
_send_audit_notification(self.action, initiator,
taxonomy.OUTCOME_SUCCESS)
return result
return wrapper
def _send_audit_notification(action, initiator, outcome):
"""Send CADF notification to inform observers about the affected resource.
This method logs an exception when sending the notification fails.
:param action: CADF action being audited (e.g., 'authenticate')
:param initiator: CADF resource representing the initiator
:param outcome: The CADF outcome (taxonomy.OUTCOME_PENDING,
taxonomy.OUTCOME_SUCCESS, taxonomy.OUTCOME_FAILURE)
"""
event = eventfactory.EventFactory().new_event(
eventType=cadftype.EVENTTYPE_ACTIVITY,
outcome=outcome,
action=action,
initiator=initiator,
target=resource.Resource(typeURI=taxonomy.ACCOUNT_USER),
observer=resource.Resource(typeURI=taxonomy.SERVICE_SECURITY))
context = {}
payload = event.as_dict()
LOG.debug('CADF Event: %s', payload)
service = 'identity'
event_type = '%(service)s.%(action)s' % {'service': service,
'action': action}
notifier = _get_notifier()
if notifier:
try:
notifier.info(context, event_type, payload)
except Exception:
# diaper defense: any exception that occurs while emitting the
# notification should not interfere with the API request
LOG.exception(_(
'Failed to send %(action)s %(event_type)s notification'),
{'action': action, 'event_type': event_type})
emit_event = CadfNotificationWrapper