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OpenStack Study: nova.py**** CubicPower OpenStack Study ****
# 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. import novaclient.v1_1.client as nclient from novaclient.v1_1.contrib import server_external_events from oslo.config import cfg from sqlalchemy.orm import attributes as sql_attr from neutron.common import constants from neutron import context from neutron import manager from neutron.openstack.common import log as logging from neutron.openstack.common import loopingcall from neutron.openstack.common import uuidutils LOG = logging.getLogger(__name__) VIF_UNPLUGGED = 'network-vif-unplugged' VIF_PLUGGED = 'network-vif-plugged' NEUTRON_NOVA_EVENT_STATUS_MAP = {constants.PORT_STATUS_ACTIVE: 'completed', constants.PORT_STATUS_ERROR: 'failed', constants.PORT_STATUS_DOWN: 'completed'}
**** CubicPower OpenStack Study **** class Notifier(object):
**** CubicPower OpenStack Study **** def __init__(self): # TODO(arosen): we need to cache the endpoints and figure out # how to deal with different regions here.... bypass_url = "%s/%s" % (cfg.CONF.nova_url, cfg.CONF.nova_admin_tenant_id) self.nclient = nclient.Client( username=cfg.CONF.nova_admin_username, api_key=cfg.CONF.nova_admin_password, project_id=None, tenant_id=cfg.CONF.nova_admin_tenant_id, auth_url=cfg.CONF.nova_admin_auth_url, bypass_url=bypass_url, region_name=cfg.CONF.nova_region_name, extensions=[server_external_events]) self.pending_events = [] event_sender = loopingcall.FixedIntervalLoopingCall(self.send_events) event_sender.start(interval=cfg.CONF.send_events_interval)
**** CubicPower OpenStack Study **** def _is_compute_port(self, port): try: if (port['device_id'] and uuidutils.is_uuid_like(port['device_id']) and port['device_owner'].startswith('compute:')): return True except (KeyError, AttributeError): pass return False
**** CubicPower OpenStack Study **** def _get_network_changed_event(self, device_id): return {'name': 'network-changed', 'server_uuid': device_id} @property
**** CubicPower OpenStack Study **** def _plugin(self): # NOTE(arosen): this cannot be set in __init__ currently since # this class is initalized at the same time as NeutronManager() # which is decorated with synchronized() if not hasattr(self, '_plugin_ref'): self._plugin_ref = manager.NeutronManager.get_plugin() return self._plugin_ref
**** CubicPower OpenStack Study **** 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 occured. :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 event = self.create_port_changed_event(action, original_obj, returned_obj) if event: self.pending_events.append(event)
**** CubicPower OpenStack Study **** def create_port_changed_event(self, action, original_obj, returned_obj): port = None if action == 'update_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() port = self._plugin.get_port(ctx, port_id) if port and self._is_compute_port(port): return self._get_network_changed_event(port['device_id'])
**** CubicPower OpenStack Study **** 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 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 yet.")) return if not port.id: LOG.warning(_("Port ID not set! Nova will not be notified of " "port status change.")) return # We only want to notify about nova ports. if not self._is_compute_port(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})
**** CubicPower OpenStack Study **** def send_port_status(self, mapper, connection, port): event = getattr(port, "_notify_event", None) if event: self.pending_events.append(event) port._notify_event = None
**** CubicPower OpenStack Study **** def send_events(self): batched_events = [] for event in range(len(self.pending_events)): batched_events.append(self.pending_events.pop()) if not batched_events: return LOG.debug(_("Sending events: %s"), batched_events) try: response = self.nclient.server_external_events.create( 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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