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# RhodeCode VCSServer provides access to different vcs backends via network.
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# Copyright (C) 2014-2020 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 General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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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 General Public License
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# along with this program; if not, write to the Free Software Foundation,
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# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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import time
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import errno
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import logging
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import functools
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import msgpack
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import redis
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import pickle
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import fcntl
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flock_org = fcntl.flock
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from typing import Union
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from dogpile.cache.backends import memory as memory_backend
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from dogpile.cache.backends import file as file_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 dogpile.cache.api import Serializer, Deserializer
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from pyramid.settings import asbool
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from vcsserver.lib.memory_lru_dict import LRUDict, LRUDictDebug
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from vcsserver.str_utils import safe_str, safe_bytes
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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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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(max_size)
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super(LRUMemoryBackend, self).__init__(arguments)
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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 delete_multi(self, keys):
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for key in keys:
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self.delete(key)
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class PickleSerializer:
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serializer: Union[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: Union[None, Deserializer] = staticmethod( # type: ignore
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functools.partial(pickle.loads)
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)
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class MsgPackSerializer(object):
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serializer: Union[None, Serializer] = staticmethod( # type: ignore
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msgpack.packb
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)
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deserializer: Union[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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pass
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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 %s DB in %s', self.__class__.__name__, db_file)
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try:
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super(FileNamespaceBackend, self).__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 '{} `{}`'.format(self.__class__, self.filename)
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def list_keys(self, prefix: bytes = b''):
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prefix = b'%b:%b' % (safe_bytes(self.key_prefix), safe_bytes(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 get_store(self):
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return self.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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super(BaseRedisBackend, self).__init__(arguments)
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self._lock_timeout = self.lock_timeout
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self._lock_auto_renewal = asbool(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 _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 list_keys(self, prefix=''):
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prefix = '{}:{}*'.format(self.key_prefix, prefix)
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return self.reader_client.keys(prefix)
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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 = '_lock_{0}'.format(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 vcsserver.lib._vendor import redis_lock
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class _RedisLockWrapper(object):
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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 "{}:{}".format(self.__class__.__name__, lock_key)
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def __str__(self):
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return "{}:{}".format(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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