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# Copyright (C) 2015-2023 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 errno
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import fcntl
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import functools
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import logging
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import os
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import pickle
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import time
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import gevent
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import msgpack
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import redis
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flock_org = fcntl.flock
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from typing import Union
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from dogpile.cache.api import Deserializer, Serializer
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from dogpile.cache.backends import file as file_backend
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from dogpile.cache.backends import memory as memory_backend
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from dogpile.cache.backends import redis as redis_backend
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from dogpile.cache.backends.file import FileLock
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from dogpile.cache.util import memoized_property
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from ...lib.memory_lru_dict import LRUDict, LRUDictDebug
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from ...lib.str_utils import safe_bytes, safe_str
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from ...lib.type_utils import str2bool
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_default_max_size = 1024
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log = logging.getLogger(__name__)
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class LRUMemoryBackend(memory_backend.MemoryBackend):
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key_prefix = 'lru_mem_backend'
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pickle_values = False
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def __init__(self, arguments):
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self.max_size = arguments.pop('max_size', _default_max_size)
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LRUDictClass = LRUDict
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if arguments.pop('log_key_count', None):
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LRUDictClass = LRUDictDebug
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arguments['cache_dict'] = LRUDictClass(self.max_size)
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super().__init__(arguments)
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def __repr__(self):
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return f'{self.__class__}(maxsize=`{self.max_size}`)'
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def __str__(self):
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return self.__repr__()
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def delete(self, key):
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try:
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del self._cache[key]
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except KeyError:
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# we don't care if key isn't there at deletion
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pass
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def list_keys(self, prefix):
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return list(self._cache.keys())
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def delete_multi(self, keys):
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for key in keys:
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self.delete(key)
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def delete_multi_by_prefix(self, prefix):
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cache_keys = self.list_keys(prefix=prefix)
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num_affected_keys = len(cache_keys)
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if num_affected_keys:
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self.delete_multi(cache_keys)
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return num_affected_keys
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class PickleSerializer:
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serializer: None | Serializer = staticmethod( # type: ignore
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functools.partial(pickle.dumps, protocol=pickle.HIGHEST_PROTOCOL)
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)
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deserializer: None | Deserializer = staticmethod( # type: ignore
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functools.partial(pickle.loads)
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)
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class MsgPackSerializer:
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serializer: None | Serializer = staticmethod( # type: ignore
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msgpack.packb
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)
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deserializer: None | Deserializer = staticmethod( # type: ignore
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functools.partial(msgpack.unpackb, use_list=False)
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)
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class CustomLockFactory(FileLock):
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@memoized_property
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def _module(self):
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def gevent_flock(fd, operation):
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"""
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Gevent compatible flock
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"""
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# set non-blocking, this will cause an exception if we cannot acquire a lock
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operation |= fcntl.LOCK_NB
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start_lock_time = time.time()
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timeout = 60 * 15 # 15min
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while True:
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try:
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flock_org(fd, operation)
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# lock has been acquired
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break
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except (OSError, IOError) as e:
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# raise on other errors than Resource temporarily unavailable
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if e.errno != errno.EAGAIN:
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raise
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elif (time.time() - start_lock_time) > timeout:
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# waited to much time on a lock, better fail than loop for ever
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log.error('Failed to acquire lock on `%s` after waiting %ss',
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self.filename, timeout)
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raise
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wait_timeout = 0.03
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log.debug('Failed to acquire lock on `%s`, retry in %ss',
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self.filename, wait_timeout)
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gevent.sleep(wait_timeout)
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fcntl.flock = gevent_flock
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return fcntl
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class FileNamespaceBackend(PickleSerializer, file_backend.DBMBackend):
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key_prefix = 'file_backend'
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def __init__(self, arguments):
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arguments['lock_factory'] = CustomLockFactory
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db_file = arguments.get('filename')
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log.debug('initialing cache-backend=%s db in %s', self.__class__.__name__, db_file)
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db_file_dir = os.path.dirname(db_file)
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if not os.path.isdir(db_file_dir):
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os.makedirs(db_file_dir)
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try:
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super().__init__(arguments)
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except Exception:
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log.exception('Failed to initialize db at: %s', db_file)
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raise
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def __repr__(self):
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return f'{self.__class__}(file=`{self.filename}`)'
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def __str__(self):
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return self.__repr__()
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def _get_keys_pattern(self, prefix: bytes = b''):
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return b'%b:%b' % (safe_bytes(self.key_prefix), safe_bytes(prefix))
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def list_keys(self, prefix: bytes = b''):
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prefix = self._get_keys_pattern(prefix)
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def cond(dbm_key: bytes):
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if not prefix:
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return True
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if dbm_key.startswith(prefix):
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return True
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return False
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with self._dbm_file(True) as dbm:
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try:
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return list(filter(cond, dbm.keys()))
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except Exception:
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log.error('Failed to fetch DBM keys from DB: %s', self.get_store())
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raise
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def delete_multi_by_prefix(self, prefix):
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cache_keys = self.list_keys(prefix=prefix)
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num_affected_keys = len(cache_keys)
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if num_affected_keys:
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self.delete_multi(cache_keys)
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return num_affected_keys
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def get_store(self):
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return self.filename
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def cleanup_store(self):
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for ext in ("db", "dat", "pag", "dir"):
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final_filename = self.filename + os.extsep + ext
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if os.path.exists(final_filename):
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os.remove(final_filename)
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log.warning('Removed dbm file %s', final_filename)
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class BaseRedisBackend(redis_backend.RedisBackend):
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key_prefix = ''
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def __init__(self, arguments):
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self.db_conn = arguments.get('host', '') or arguments.get('url', '') or 'redis-host'
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super().__init__(arguments)
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self._lock_timeout = self.lock_timeout
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self._lock_auto_renewal = str2bool(arguments.pop("lock_auto_renewal", True))
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if self._lock_auto_renewal and not self._lock_timeout:
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# set default timeout for auto_renewal
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self._lock_timeout = 30
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def __repr__(self):
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return f'{self.__class__}(conn=`{self.db_conn}`)'
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def __str__(self):
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return self.__repr__()
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def _create_client(self):
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args = {}
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if self.url is not None:
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args.update(url=self.url)
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else:
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args.update(
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host=self.host, password=self.password,
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port=self.port, db=self.db
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)
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connection_pool = redis.ConnectionPool(**args)
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self.writer_client = redis.StrictRedis(
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connection_pool=connection_pool
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)
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self.reader_client = self.writer_client
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def _get_keys_pattern(self, prefix: bytes = b''):
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return b'%b:%b*' % (safe_bytes(self.key_prefix), safe_bytes(prefix))
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def list_keys(self, prefix: bytes = b''):
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prefix = self._get_keys_pattern(prefix)
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return self.reader_client.keys(prefix)
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def delete_multi_by_prefix(self, prefix, use_lua=False):
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if use_lua:
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# high efficient LUA script to delete ALL keys by prefix...
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lua = """local keys = redis.call('keys', ARGV[1])
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for i=1,#keys,5000 do
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redis.call('del', unpack(keys, i, math.min(i+(5000-1), #keys)))
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end
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return #keys"""
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num_affected_keys = self.writer_client.eval(
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lua,
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0,
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f"{prefix}*")
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else:
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cache_keys = self.list_keys(prefix=prefix)
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num_affected_keys = len(cache_keys)
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if num_affected_keys:
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self.delete_multi(cache_keys)
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return num_affected_keys
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def get_store(self):
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return self.reader_client.connection_pool
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def get_mutex(self, key):
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if self.distributed_lock:
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lock_key = f'_lock_{safe_str(key)}'
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return get_mutex_lock(
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self.writer_client, lock_key,
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self._lock_timeout,
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auto_renewal=self._lock_auto_renewal
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)
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else:
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return None
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class RedisPickleBackend(PickleSerializer, BaseRedisBackend):
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key_prefix = 'redis_pickle_backend'
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pass
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class RedisMsgPackBackend(MsgPackSerializer, BaseRedisBackend):
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key_prefix = 'redis_msgpack_backend'
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pass
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def get_mutex_lock(client, lock_key, lock_timeout, auto_renewal=False):
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from ...lib._vendor import redis_lock
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class _RedisLockWrapper:
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"""LockWrapper for redis_lock"""
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@classmethod
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def get_lock(cls):
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return redis_lock.Lock(
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redis_client=client,
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name=lock_key,
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expire=lock_timeout,
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auto_renewal=auto_renewal,
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strict=True,
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)
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def __repr__(self):
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return f"{self.__class__.__name__}:{lock_key}"
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def __str__(self):
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return f"{self.__class__.__name__}:{lock_key}"
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def __init__(self):
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self.lock = self.get_lock()
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self.lock_key = lock_key
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def acquire(self, wait=True):
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log.debug('Trying to acquire Redis lock for key %s', self.lock_key)
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try:
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acquired = self.lock.acquire(wait)
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log.debug('Got lock for key %s, %s', self.lock_key, acquired)
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return acquired
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except redis_lock.AlreadyAcquired:
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return False
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except redis_lock.AlreadyStarted:
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# refresh thread exists, but it also means we acquired the lock
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return True
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def release(self):
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try:
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self.lock.release()
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except redis_lock.NotAcquired:
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pass
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return _RedisLockWrapper()
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