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# Copyright 2012 Michael Still and Canonical Inc
#
# 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 os
import time
from oslo_config import cfg
from oslo_log import log as logging
from oslo_serialization import jsonutils
from nova import utils
LOG = logging.getLogger(__name__)
CONF = cfg.CONF
TWENTY_FOUR_HOURS = 3600 * 24
# NOTE(morganfainberg): Due to circular import dependencies, the use of the
# CONF.instances_path needs to be wrapped so that it can be resolved at the
# appropriate time. Because compute.manager imports this file, we end up in
# a rather ugly dependency loop without moving this into a wrapped function.
# This issue mostly stems from the use of a decorator for the lock
# synchronize and the implications of how decorators wrap the wrapped function
# or method. If this needs to be used outside of compute.manager, it should
# be refactored to eliminate this circular dependency loop.
# config option import is avoided here since it is
# explicitly imported from compute.manager and may cause issues with
# defining options after config has been processed with the
# wrapped-function style used here.
def register_storage_use(storage_path, hostname):
"""Identify the id of this instance storage."""
LOCK_PATH = os.path.join(CONF.instances_path, 'locks')
@utils.synchronized('storage-registry-lock', external=True,
lock_path=LOCK_PATH)
def do_register_storage_use(storage_path, hostname):
# NOTE(mikal): this is required to determine if the instance storage is
# shared, which is something that the image cache manager needs to
# know. I can imagine other uses as well though.
d = {}
id_path = os.path.join(storage_path, 'compute_nodes')
if os.path.exists(id_path):
with open(id_path) as f:
try:
d = jsonutils.loads(f.read())
except ValueError:
LOG.warning("Cannot decode JSON from %(id_path)s",
{"id_path": id_path})
d[hostname] = time.time()
with open(id_path, 'w') as f:
f.write(jsonutils.dumps(d))
return do_register_storage_use(storage_path, hostname)
def get_storage_users(storage_path):
"""Get a list of all the users of this storage path."""
# See comments above method register_storage_use
LOCK_PATH = os.path.join(CONF.instances_path, 'locks')
@utils.synchronized('storage-registry-lock', external=True,
lock_path=LOCK_PATH)
def do_get_storage_users(storage_path):
d = {}
id_path = os.path.join(storage_path, 'compute_nodes')
if os.path.exists(id_path):
with open(id_path) as f:
try:
d = jsonutils.loads(f.read())
except ValueError:
LOG.warning("Cannot decode JSON from %(id_path)s",
{"id_path": id_path})
recent_users = []
for node in d:
if time.time() - d[node] < TWENTY_FOUR_HOURS:
recent_users.append(node)
return recent_users
return do_get_storage_users(storage_path)
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