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# Copyright (c) 2014 OpenStack Foundation.
# 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.
from keystoneauth1 import loading as ks_loading
from neutron_lib.callbacks import events
from neutron_lib.callbacks import registry
from neutron_lib.callbacks import resources
from neutron_lib import constants
from neutron_lib import context
from neutron_lib import exceptions as exc
from neutron_lib.plugins import directory
from novaclient import api_versions
from novaclient import client as nova_client
from novaclient import exceptions as nova_exceptions
from oslo_config import cfg
from oslo_context import context as common_context
from oslo_log import log as logging
from oslo_utils import uuidutils
from sqlalchemy.orm import attributes as sql_attr
from neutron.notifiers import batch_notifier
LOG = logging.getLogger(__name__)
VIF_UNPLUGGED = 'network-vif-unplugged'
VIF_PLUGGED = 'network-vif-plugged'
VIF_DELETED = 'network-vif-deleted'
NEUTRON_NOVA_EVENT_STATUS_MAP = {constants.PORT_STATUS_ACTIVE: 'completed',
constants.PORT_STATUS_ERROR: 'failed',
constants.PORT_STATUS_DOWN: 'completed'}
NOVA_API_VERSION = "2.1"
@registry.has_registry_receivers
class Notifier(object):
_instance = None
@classmethod
def get_instance(cls):
if cls._instance is None:
cls._instance = cls()
return cls._instance
def __init__(self):
auth = ks_loading.load_auth_from_conf_options(cfg.CONF, 'nova')
self.session = ks_loading.load_session_from_conf_options(
cfg.CONF,
'nova',
auth=auth)
self.extensions = [
ext for ext in nova_client.discover_extensions(NOVA_API_VERSION)
if ext.name == "server_external_events"]
self.batch_notifier = batch_notifier.BatchNotifier(
cfg.CONF.send_events_interval, self.send_events)
def _get_nova_client(self):
global_id = common_context.generate_request_id()
return nova_client.Client(
api_versions.APIVersion(NOVA_API_VERSION),
session=self.session,
region_name=cfg.CONF.nova.region_name,
endpoint_type=cfg.CONF.nova.endpoint_type,
extensions=self.extensions,
global_request_id=global_id)
def _is_compute_port(self, port):
try:
if (port['device_id'] and
uuidutils.is_uuid_like(port['device_id']) and
port['device_owner'].startswith(
constants.DEVICE_OWNER_COMPUTE_PREFIX)):
return True
except (KeyError, AttributeError):
pass
return False
def _get_network_changed_event(self, port):
return {'name': 'network-changed',
'server_uuid': port['device_id'],
'tag': port['id']}
def _get_port_delete_event(self, port):
return {'server_uuid': port['device_id'],
'name': VIF_DELETED,
'tag': port['id']}
@registry.receives(resources.PORT, [events.BEFORE_RESPONSE])
@registry.receives(resources.FLOATING_IP, [events.BEFORE_RESPONSE])
def _send_nova_notification(self, resource, event, trigger, payload=None):
self.send_network_change(payload.action, payload.states[0],
payload.latest_state)
def send_network_change(self, action, original_obj,
returned_obj):
"""Called when a network change is made that nova cares about.
:param action: the event that occurred.
:param original_obj: the previous value of resource before action.
:param returned_obj: the body returned to client as result of action.
"""
if not cfg.CONF.notify_nova_on_port_data_changes:
return
# When neutron re-assigns floating ip from an original instance
# port to a new instance port without disassociate it first, an
# event should be sent for original instance, that will make nova
# know original instance's info, and update database for it.
if (action == 'update_floatingip' and
returned_obj['floatingip'].get('port_id') and
original_obj.get('port_id')):
disassociate_returned_obj = {'floatingip': {'port_id': None}}
event = self.create_port_changed_event(action, original_obj,
disassociate_returned_obj)
self.batch_notifier.queue_event(event)
event = self.create_port_changed_event(action, original_obj,
returned_obj)
self.batch_notifier.queue_event(event)
def create_port_changed_event(self, action, original_obj, returned_obj):
port = None
if action in ['update_port', 'delete_port']:
port = returned_obj['port']
elif action in ['update_floatingip', 'create_floatingip',
'delete_floatingip']:
# NOTE(arosen) if we are associating a floatingip the
# port_id is in the returned_obj. Otherwise on disassociate
# it's in the original_object
port_id = (returned_obj['floatingip'].get('port_id') or
original_obj.get('port_id'))
if port_id is None:
return
ctx = context.get_admin_context()
try:
port = directory.get_plugin().get_port(ctx, port_id)
except exc.PortNotFound:
LOG.debug("Port %s was deleted, no need to send any "
"notification", port_id)
return
if port and self._is_compute_port(port):
if action == 'delete_port':
return self._get_port_delete_event(port)
else:
return self._get_network_changed_event(port)
def _can_notify(self, port):
if not port.id:
LOG.warning("Port ID not set! Nova will not be notified of "
"port status change.")
return False
# If there is no device_id set there is nothing we can do here.
if not port.device_id:
LOG.debug("device_id is not set on port %s yet.", port.id)
return False
# We only want to notify about nova ports.
if not self._is_compute_port(port):
return False
return True
def record_port_status_changed(self, port, current_port_status,
previous_port_status, initiator):
"""Determine if nova needs to be notified due to port status change.
"""
# clear out previous _notify_event
port._notify_event = None
if not self._can_notify(port):
return
# We notify nova when a vif is unplugged which only occurs when
# the status goes from ACTIVE to DOWN.
if (previous_port_status == constants.PORT_STATUS_ACTIVE and
current_port_status == constants.PORT_STATUS_DOWN):
event_name = VIF_UNPLUGGED
# We only notify nova when a vif is plugged which only occurs
# when the status goes from:
# NO_VALUE/DOWN/BUILD -> ACTIVE/ERROR.
elif (previous_port_status in [sql_attr.NO_VALUE,
constants.PORT_STATUS_DOWN,
constants.PORT_STATUS_BUILD] and
current_port_status in [constants.PORT_STATUS_ACTIVE,
constants.PORT_STATUS_ERROR]):
event_name = VIF_PLUGGED
# All the remaining state transitions are of no interest to nova
else:
LOG.debug("Ignoring state change previous_port_status: "
"%(pre_status)s current_port_status: %(cur_status)s"
" port_id %(id)s",
{'pre_status': previous_port_status,
'cur_status': current_port_status,
'id': port.id})
return
port._notify_event = (
{'server_uuid': port.device_id,
'name': event_name,
'status': NEUTRON_NOVA_EVENT_STATUS_MAP.get(current_port_status),
'tag': port.id})
def send_port_status(self, mapper, connection, port):
event = getattr(port, "_notify_event", None)
self.batch_notifier.queue_event(event)
port._notify_event = None
def notify_port_active_direct(self, port):
"""Notify nova about active port
Used when port was wired on the host other than port's current host
according to port binding. This happens during live migration.
In this case ml2 plugin skips port status update but we still we need
to notify nova.
"""
if not self._can_notify(port):
return
port._notify_event = (
{'server_uuid': port.device_id,
'name': VIF_PLUGGED,
'status': 'completed',
'tag': port.id})
self.send_port_status(None, None, port)
def send_events(self, batched_events):
LOG.debug("Sending events: %s", batched_events)
novaclient = self._get_nova_client()
try:
response = novaclient.server_external_events.create(
batched_events)
except nova_exceptions.NotFound:
LOG.debug("Nova returned NotFound for event: %s",
batched_events)
except Exception:
LOG.exception("Failed to notify nova on events: %s",
batched_events)
else:
if not isinstance(response, list):
LOG.error("Error response returned from nova: %s",
response)
return
response_error = False
for event in response:
try:
code = event['code']
except KeyError:
response_error = True
continue
if code != 200:
LOG.warning("Nova event: %s returned with failed "
"status", event)
else:
LOG.info("Nova event response: %s", event)
if response_error:
LOG.error("Error response returned from nova: %s",
response)
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