9b1450398c
Since we've dropped support for Python 2.7, it's time to look at the bright future that Python 3.x will bring and stop forcing compatibility with older versions. This patch removes the six library from requirements, not looking back. Change-Id: Ic443c7e4d5a5a849c4dc220207f8957e4c90bf53
107 lines
2.6 KiB
Python
107 lines
2.6 KiB
Python
# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain 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,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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# implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import abc
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from oslo_concurrency import lockutils
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from oslo_config import cfg
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from ironic_inspector.common import coordination
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CONF = cfg.CONF
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_LOCK_TEMPLATE = 'node-%s'
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_SEMAPHORES = lockutils.Semaphores()
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class BaseLock(object, metaclass=abc.ABCMeta):
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@abc.abstractmethod
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def acquire(self, blocking=True):
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"""Acquire lock."""
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@abc.abstractmethod
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def release(self):
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"""Release lock."""
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@abc.abstractmethod
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def is_locked(self):
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"""Return lock status"""
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class InternalLock(BaseLock):
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"""Locking mechanism based on threading.Semaphore."""
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def __init__(self, uuid):
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self._lock = lockutils.internal_lock(_LOCK_TEMPLATE % uuid,
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semaphores=_SEMAPHORES)
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self._locked = False
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def acquire(self, blocking=True):
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if not self._locked:
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self._locked = self._lock.acquire(blocking=blocking)
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return self._locked
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def release(self):
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if self._locked:
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self._lock.release()
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self._locked = False
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def is_locked(self):
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return self._locked
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def __enter__(self):
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self._lock.acquire()
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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self._lock.release()
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class ToozLock(BaseLock):
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"""Wrapper on tooz locks."""
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def __init__(self, lock):
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"""Creates a wrapper on the tooz lock.
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:param lock: a tooz lock instance.
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"""
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self._lock = lock
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def acquire(self, blocking=True):
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if not self._lock.acquired:
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self._lock.acquire(blocking=blocking)
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return self._lock.acquired
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def release(self):
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if self._lock.acquired:
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self._lock.release()
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def is_locked(self):
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return self._lock.acquired
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def __enter__(self):
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self._lock.acquire()
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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self._lock.release()
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def get_lock(uuid):
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if CONF.standalone:
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return InternalLock(uuid)
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coordinator = coordination.get_coordinator()
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lock = coordinator.get_lock(uuid)
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return ToozLock(lock)
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