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# Copyright 2016 Tesora, Inc.
# 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 oslo_log import log as logging
from trove.common.clients import create_nova_client
LOG = logging.getLogger(__name__)
class ServerGroup(object):
@classmethod
def load(cls, context, instance_id):
client = create_nova_client(context)
server_group = None
expected_name = "locality_%s" % instance_id
try:
for sg in client.server_groups.list():
if sg.name == expected_name:
server_group = sg
except Exception:
LOG.exception("Could not load server group for instance %s",
instance_id)
if not server_group:
LOG.info('No server group found for instance %s', instance_id)
return server_group
@classmethod
def create(cls, context, locality, name_suffix):
client = create_nova_client(context)
server_group_name = "%s_%s" % ('locality', name_suffix)
server_group = client.server_groups.create(
name=server_group_name, policies=[locality])
LOG.debug("Created '%(locality)s' server group called %(group_name)s "
"(id: %(group_id)s).",
{'locality': locality, 'group_name': server_group_name,
'group_id': server_group.id})
return server_group
@classmethod
def delete(cls, context, server_group, force=False):
# Only delete the server group if we're the last member in it, or if
# it has no members
if server_group:
if force or len(server_group.members) <= 1:
LOG.info("Deleting server group %s", server_group.id)
client = create_nova_client(context)
client.server_groups.delete(server_group.id)
else:
LOG.debug("Skipping delete of server group %(id)s "
"(members: %(members)s).",
{'id': server_group.id,
'members': server_group.members})
@classmethod
def convert_to_hint(cls, server_group, hints=None):
if server_group:
hints = hints or {}
hints["group"] = server_group.id
return hints
@classmethod
def build_scheduler_hint(cls, context, locality, name_suffix):
scheduler_hint = None
if locality:
# Build the scheduler hint, but only if locality's a string
if isinstance(locality, str):
server_group = cls.create(
context, locality, name_suffix)
scheduler_hint = cls.convert_to_hint(
server_group)
else:
# otherwise assume it's already in hint form (i.e. a dict)
scheduler_hint = locality
return scheduler_hint
@classmethod
def get_locality(cls, server_group):
locality = None
if server_group:
locality = server_group.policies[0]
return locality
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