154 lines
6.2 KiB
Python
154 lines
6.2 KiB
Python
# Copyright 2014 Red Hat, Inc.
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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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from oslo_log import log as logging
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import webob
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from nova.api.openstack.compute.schemas import server_external_events
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from nova.api.openstack import wsgi
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from nova.api import validation
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from nova.compute import api as compute
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from nova import context as nova_context
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from nova.i18n import _
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from nova import objects
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from nova.policies import server_external_events as see_policies
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LOG = logging.getLogger(__name__)
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class ServerExternalEventsController(wsgi.Controller):
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def __init__(self):
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super(ServerExternalEventsController, self).__init__()
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self.compute_api = compute.API()
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@staticmethod
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def _is_event_tag_present_when_required(event):
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if event.name == 'volume-extended' and event.tag is None:
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return False
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return True
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def _get_instances_all_cells(self, context, instance_uuids,
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instance_mappings):
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cells = {}
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instance_uuids_by_cell = {}
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for im in instance_mappings:
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if im.cell_mapping.uuid not in cells:
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cells[im.cell_mapping.uuid] = im.cell_mapping
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instance_uuids_by_cell.setdefault(im.cell_mapping.uuid, list())
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instance_uuids_by_cell[im.cell_mapping.uuid].append(
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im.instance_uuid)
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instances = {}
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for cell_uuid, cell in cells.items():
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with nova_context.target_cell(context, cell) as cctxt:
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instances.update(
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{inst.uuid: inst for inst in
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objects.InstanceList.get_by_filters(
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cctxt, {'uuid': instance_uuids_by_cell[cell_uuid]},
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expected_attrs=['migration_context', 'info_cache'])})
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return instances
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@wsgi.expected_errors((403, 404))
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@wsgi.response(200)
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@validation.schema(server_external_events.create, '2.0', '2.50')
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@validation.schema(server_external_events.create_v251, '2.51')
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def create(self, req, body):
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"""Creates a new instance event."""
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context = req.environ['nova.context']
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context.can(see_policies.POLICY_ROOT % 'create')
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response_events = []
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accepted_events = []
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accepted_instances = set()
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result = 200
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body_events = body['events']
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# Fetch instance objects for all relevant instances
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instance_uuids = set([event['server_uuid'] for event in body_events])
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instance_mappings = objects.InstanceMappingList.get_by_instance_uuids(
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context, list(instance_uuids))
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instances = self._get_instances_all_cells(context, instance_uuids,
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instance_mappings)
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for _event in body_events:
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client_event = dict(_event)
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event = objects.InstanceExternalEvent(context)
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event.instance_uuid = client_event.pop('server_uuid')
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event.name = client_event.pop('name')
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event.status = client_event.pop('status', 'completed')
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event.tag = client_event.pop('tag', None)
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response_events.append(_event)
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instance = instances.get(event.instance_uuid)
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if not instance:
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LOG.debug('Dropping event %(name)s:%(tag)s for unknown '
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'instance %(instance_uuid)s',
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{'name': event.name, 'tag': event.tag,
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'instance_uuid': event.instance_uuid})
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_event['status'] = 'failed'
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_event['code'] = 404
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result = 207
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continue
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# NOTE: before accepting the event, make sure the instance
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# for which the event is sent is assigned to a host; otherwise
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# it will not be possible to dispatch the event
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if not self._is_event_tag_present_when_required(event):
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LOG.debug("Event tag is missing for instance "
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"%(instance)s. Dropping event %(event)s",
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{'instance': event.instance_uuid,
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'event': event.name})
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_event['status'] = 'failed'
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_event['code'] = 400
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result = 207
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elif instance.host:
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accepted_events.append(event)
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accepted_instances.add(instance)
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LOG.info('Creating event %(name)s:%(tag)s for '
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'instance %(instance_uuid)s on %(host)s',
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{'name': event.name, 'tag': event.tag,
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'instance_uuid': event.instance_uuid,
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'host': instance.host})
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# NOTE: as the event is processed asynchronously verify
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# whether 202 is a more suitable response code than 200
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_event['status'] = 'completed'
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_event['code'] = 200
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else:
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LOG.debug("Unable to find a host for instance "
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"%(instance)s. Dropping event %(event)s",
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{'instance': event.instance_uuid,
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'event': event.name})
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_event['status'] = 'failed'
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_event['code'] = 422
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result = 207
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if accepted_events:
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self.compute_api.external_instance_event(
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context, accepted_instances, accepted_events)
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else:
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msg = _('No instances found for any event')
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raise webob.exc.HTTPNotFound(explanation=msg)
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# FIXME(cyeoh): This needs some infrastructure support so that
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# we have a general way to do this
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robj = wsgi.ResponseObject({'events': response_events})
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robj._code = result
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return robj
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