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# Copyright (c) 2012 Rackspace Hosting
# 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.
"""
Cells Utility Methods
"""
import random
from nova import db
# Separator used between cell names for the 'full cell name' and routing
# path
_PATH_CELL_SEP = '!'
# Separator used between cell name and item
_CELL_ITEM_SEP = '@'
def get_instances_to_sync(context, updated_since=None, project_id=None,
deleted=True, shuffle=False, uuids_only=False):
"""Return a generator that will return a list of active and
deleted instances to sync with parent cells. The list may
optionally be shuffled for periodic updates so that multiple
cells services aren't self-healing the same instances in nearly
lockstep.
"""
filters = {}
if updated_since is not None:
filters['changes-since'] = updated_since
if project_id is not None:
filters['project_id'] = project_id
if not deleted:
filters['deleted'] = False
# Active instances first.
instances = db.instance_get_all_by_filters(
context, filters, 'deleted', 'asc')
if shuffle:
random.shuffle(instances)
for instance in instances:
if uuids_only:
yield instance['uuid']
else:
yield instance
def cell_with_item(cell_name, item):
"""Turn cell_name and item into <cell_name>@<item>."""
if cell_name is None:
return item
return cell_name + _CELL_ITEM_SEP + str(item)
def split_cell_and_item(cell_and_item):
"""Split a combined cell@item and return them."""
result = cell_and_item.rsplit(_CELL_ITEM_SEP, 1)
if len(result) == 1:
return (None, cell_and_item)
else:
return result
def _add_cell_to_service(service, cell_name):
service['id'] = cell_with_item(cell_name, service['id'])
service['host'] = cell_with_item(cell_name, service['host'])
def add_cell_to_compute_node(compute_node, cell_name):
"""Fix compute_node attributes that should be unique. Allows
API cell to query the 'id' by cell@id.
"""
compute_node['id'] = cell_with_item(cell_name, compute_node['id'])
# Might have a 'service' backref. But if is_primitive() was used
# on this and it recursed too deep, 'service' may be "?".
service = compute_node.get('service')
if isinstance(service, dict):
_add_cell_to_service(service, cell_name)
def add_cell_to_service(service, cell_name):
"""Fix service attributes that should be unique. Allows
API cell to query the 'id' or 'host' by cell@id/host.
"""
_add_cell_to_service(service, cell_name)
compute_node = service.get('compute_node')
if compute_node:
add_cell_to_compute_node(compute_node[0], cell_name)
def add_cell_to_task_log(task_log, cell_name):
"""Fix task_log attributes that should be unique. In particular,
the 'id' and 'host' fields should be prepended with cell name.
"""
task_log['id'] = cell_with_item(cell_name, task_log['id'])
task_log['host'] = cell_with_item(cell_name, task_log['host'])
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