58 lines
1.9 KiB
Python
58 lines
1.9 KiB
Python
# Copyright (C) 2015-2024 RhodeCode GmbH
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Affero General Public License, version 3
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# (only), as published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU Affero General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# This program is dual-licensed. If you wish to learn more about the
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# RhodeCode Enterprise Edition, including its added features, Support services,
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# and proprietary license terms, please see https://rhodecode.com/licenses/
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import redis
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from .._vendor import redis_lock
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class ArchiveCacheGenerationLock(Exception):
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pass
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class GenerationLock:
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"""
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Locking mechanism that detects if a lock is acquired
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with GenerationLock(lock_key):
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compute_archive()
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"""
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lock_timeout = 7200
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def __init__(self, lock_key, url):
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self.lock_key = lock_key
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self._create_client(url)
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self.lock = self.get_lock()
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def _create_client(self, url):
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connection_pool = redis.ConnectionPool.from_url(url)
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self.writer_client = redis.StrictRedis(connection_pool=connection_pool)
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self.reader_client = self.writer_client
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def get_lock(self):
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return redis_lock.Lock(
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redis_client=self.writer_client, name=self.lock_key, expire=self.lock_timeout, strict=True
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)
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def __enter__(self):
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acquired = self.lock.acquire(blocking=False)
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if not acquired:
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raise ArchiveCacheGenerationLock("Failed to create a lock")
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def __exit__(self, exc_type, exc_val, exc_tb):
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self.lock.release()
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