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