|
|
# RhodeCode VCSServer provides access to different vcs backends via network.
|
|
|
# Copyright (C) 2014-2020 RhodeCode GmbH
|
|
|
#
|
|
|
# This program is free software; you can redistribute it and/or modify
|
|
|
# it under the terms of the GNU General Public License as published by
|
|
|
# the Free Software Foundation; either version 3 of the License, or
|
|
|
# (at your option) any later version.
|
|
|
#
|
|
|
# This program is distributed in the hope that it will be useful,
|
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
# GNU General Public License for more details.
|
|
|
#
|
|
|
# You should have received a copy of the GNU General Public License
|
|
|
# along with this program; if not, write to the Free Software Foundation,
|
|
|
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
|
|
|
|
import time
|
|
|
import errno
|
|
|
import logging
|
|
|
|
|
|
import msgpack
|
|
|
import redis
|
|
|
|
|
|
from dogpile.cache.api import CachedValue
|
|
|
from dogpile.cache.backends import memory as memory_backend
|
|
|
from dogpile.cache.backends import file as file_backend
|
|
|
from dogpile.cache.backends import redis as redis_backend
|
|
|
from dogpile.cache.backends.file import NO_VALUE, FileLock
|
|
|
from dogpile.cache.util import memoized_property
|
|
|
|
|
|
from pyramid.settings import asbool
|
|
|
|
|
|
from vcsserver.lib.memory_lru_dict import LRUDict, LRUDictDebug
|
|
|
from vcsserver.utils import safe_str, safe_unicode
|
|
|
|
|
|
|
|
|
_default_max_size = 1024
|
|
|
|
|
|
log = logging.getLogger(__name__)
|
|
|
|
|
|
|
|
|
class LRUMemoryBackend(memory_backend.MemoryBackend):
|
|
|
key_prefix = 'lru_mem_backend'
|
|
|
pickle_values = False
|
|
|
|
|
|
def __init__(self, arguments):
|
|
|
max_size = arguments.pop('max_size', _default_max_size)
|
|
|
|
|
|
LRUDictClass = LRUDict
|
|
|
if arguments.pop('log_key_count', None):
|
|
|
LRUDictClass = LRUDictDebug
|
|
|
|
|
|
arguments['cache_dict'] = LRUDictClass(max_size)
|
|
|
super(LRUMemoryBackend, self).__init__(arguments)
|
|
|
|
|
|
def delete(self, key):
|
|
|
try:
|
|
|
del self._cache[key]
|
|
|
except KeyError:
|
|
|
# we don't care if key isn't there at deletion
|
|
|
pass
|
|
|
|
|
|
def delete_multi(self, keys):
|
|
|
for key in keys:
|
|
|
self.delete(key)
|
|
|
|
|
|
|
|
|
class PickleSerializer(object):
|
|
|
|
|
|
def _dumps(self, value, safe=False):
|
|
|
try:
|
|
|
return pickle.dumps(value)
|
|
|
except Exception:
|
|
|
if safe:
|
|
|
return NO_VALUE
|
|
|
else:
|
|
|
raise
|
|
|
|
|
|
def _loads(self, value, safe=True):
|
|
|
try:
|
|
|
return pickle.loads(value)
|
|
|
except Exception:
|
|
|
if safe:
|
|
|
return NO_VALUE
|
|
|
else:
|
|
|
raise
|
|
|
|
|
|
|
|
|
class MsgPackSerializer(object):
|
|
|
|
|
|
def _dumps(self, value, safe=False):
|
|
|
try:
|
|
|
return msgpack.packb(value)
|
|
|
except Exception:
|
|
|
if safe:
|
|
|
return NO_VALUE
|
|
|
else:
|
|
|
raise
|
|
|
|
|
|
def _loads(self, value, safe=True):
|
|
|
"""
|
|
|
pickle maintained the `CachedValue` wrapper of the tuple
|
|
|
msgpack does not, so it must be added back in.
|
|
|
"""
|
|
|
try:
|
|
|
value = msgpack.unpackb(value, use_list=False)
|
|
|
return CachedValue(*value)
|
|
|
except Exception:
|
|
|
if safe:
|
|
|
return NO_VALUE
|
|
|
else:
|
|
|
raise
|
|
|
|
|
|
|
|
|
import fcntl
|
|
|
flock_org = fcntl.flock
|
|
|
|
|
|
|
|
|
class CustomLockFactory(FileLock):
|
|
|
|
|
|
pass
|
|
|
|
|
|
|
|
|
class FileNamespaceBackend(PickleSerializer, file_backend.DBMBackend):
|
|
|
key_prefix = 'file_backend'
|
|
|
|
|
|
def __init__(self, arguments):
|
|
|
arguments['lock_factory'] = CustomLockFactory
|
|
|
db_file = arguments.get('filename')
|
|
|
|
|
|
log.debug('initialing %s DB in %s', self.__class__.__name__, db_file)
|
|
|
try:
|
|
|
super(FileNamespaceBackend, self).__init__(arguments)
|
|
|
except Exception:
|
|
|
log.exception('Failed to initialize db at: %s', db_file)
|
|
|
raise
|
|
|
|
|
|
def __repr__(self):
|
|
|
return '{} `{}`'.format(self.__class__, self.filename)
|
|
|
|
|
|
def list_keys(self, prefix=''):
|
|
|
prefix = '{}:{}'.format(self.key_prefix, prefix)
|
|
|
|
|
|
def cond(v):
|
|
|
if not prefix:
|
|
|
return True
|
|
|
|
|
|
if v.startswith(prefix):
|
|
|
return True
|
|
|
return False
|
|
|
|
|
|
with self._dbm_file(True) as dbm:
|
|
|
try:
|
|
|
return filter(cond, dbm.keys())
|
|
|
except Exception:
|
|
|
log.error('Failed to fetch DBM keys from DB: %s', self.get_store())
|
|
|
raise
|
|
|
|
|
|
def get_store(self):
|
|
|
return self.filename
|
|
|
|
|
|
def _dbm_get(self, key):
|
|
|
with self._dbm_file(False) as dbm:
|
|
|
if hasattr(dbm, 'get'):
|
|
|
value = dbm.get(key, NO_VALUE)
|
|
|
else:
|
|
|
# gdbm objects lack a .get method
|
|
|
try:
|
|
|
value = dbm[key]
|
|
|
except KeyError:
|
|
|
value = NO_VALUE
|
|
|
if value is not NO_VALUE:
|
|
|
value = self._loads(value)
|
|
|
return value
|
|
|
|
|
|
def get(self, key):
|
|
|
try:
|
|
|
return self._dbm_get(key)
|
|
|
except Exception:
|
|
|
log.error('Failed to fetch DBM key %s from DB: %s', key, self.get_store())
|
|
|
raise
|
|
|
|
|
|
def set(self, key, value):
|
|
|
with self._dbm_file(True) as dbm:
|
|
|
dbm[key] = self._dumps(value)
|
|
|
|
|
|
def set_multi(self, mapping):
|
|
|
with self._dbm_file(True) as dbm:
|
|
|
for key, value in mapping.items():
|
|
|
dbm[key] = self._dumps(value)
|
|
|
|
|
|
|
|
|
class BaseRedisBackend(redis_backend.RedisBackend):
|
|
|
key_prefix = ''
|
|
|
|
|
|
def __init__(self, arguments):
|
|
|
super(BaseRedisBackend, self).__init__(arguments)
|
|
|
self._lock_timeout = self.lock_timeout
|
|
|
self._lock_auto_renewal = asbool(arguments.pop("lock_auto_renewal", True))
|
|
|
|
|
|
if self._lock_auto_renewal and not self._lock_timeout:
|
|
|
# set default timeout for auto_renewal
|
|
|
self._lock_timeout = 30
|
|
|
|
|
|
def _create_client(self):
|
|
|
args = {}
|
|
|
|
|
|
if self.url is not None:
|
|
|
args.update(url=self.url)
|
|
|
|
|
|
else:
|
|
|
args.update(
|
|
|
host=self.host, password=self.password,
|
|
|
port=self.port, db=self.db
|
|
|
)
|
|
|
|
|
|
connection_pool = redis.ConnectionPool(**args)
|
|
|
|
|
|
return redis.StrictRedis(connection_pool=connection_pool)
|
|
|
|
|
|
def list_keys(self, prefix=''):
|
|
|
prefix = '{}:{}*'.format(self.key_prefix, prefix)
|
|
|
return self.client.keys(prefix)
|
|
|
|
|
|
def get_store(self):
|
|
|
return self.client.connection_pool
|
|
|
|
|
|
def get(self, key):
|
|
|
value = self.client.get(key)
|
|
|
if value is None:
|
|
|
return NO_VALUE
|
|
|
return self._loads(value)
|
|
|
|
|
|
def get_multi(self, keys):
|
|
|
if not keys:
|
|
|
return []
|
|
|
values = self.client.mget(keys)
|
|
|
loads = self._loads
|
|
|
return [
|
|
|
loads(v) if v is not None else NO_VALUE
|
|
|
for v in values]
|
|
|
|
|
|
def set(self, key, value):
|
|
|
if self.redis_expiration_time:
|
|
|
self.client.setex(key, self.redis_expiration_time,
|
|
|
self._dumps(value))
|
|
|
else:
|
|
|
self.client.set(key, self._dumps(value))
|
|
|
|
|
|
def set_multi(self, mapping):
|
|
|
dumps = self._dumps
|
|
|
mapping = dict(
|
|
|
(k, dumps(v))
|
|
|
for k, v in mapping.items()
|
|
|
)
|
|
|
|
|
|
if not self.redis_expiration_time:
|
|
|
self.client.mset(mapping)
|
|
|
else:
|
|
|
pipe = self.client.pipeline()
|
|
|
for key, value in mapping.items():
|
|
|
pipe.setex(key, self.redis_expiration_time, value)
|
|
|
pipe.execute()
|
|
|
|
|
|
def get_mutex(self, key):
|
|
|
if self.distributed_lock:
|
|
|
lock_key = u'_lock_{0}'.format(safe_unicode(key))
|
|
|
return get_mutex_lock(self.client, lock_key, self._lock_timeout,
|
|
|
auto_renewal=self._lock_auto_renewal)
|
|
|
else:
|
|
|
return None
|
|
|
|
|
|
|
|
|
class RedisPickleBackend(PickleSerializer, BaseRedisBackend):
|
|
|
key_prefix = 'redis_pickle_backend'
|
|
|
pass
|
|
|
|
|
|
|
|
|
class RedisMsgPackBackend(MsgPackSerializer, BaseRedisBackend):
|
|
|
key_prefix = 'redis_msgpack_backend'
|
|
|
pass
|
|
|
|
|
|
|
|
|
def get_mutex_lock(client, lock_key, lock_timeout, auto_renewal=False):
|
|
|
import redis_lock
|
|
|
|
|
|
class _RedisLockWrapper(object):
|
|
|
"""LockWrapper for redis_lock"""
|
|
|
|
|
|
@classmethod
|
|
|
def get_lock(cls):
|
|
|
return redis_lock.Lock(
|
|
|
redis_client=client,
|
|
|
name=lock_key,
|
|
|
expire=lock_timeout,
|
|
|
auto_renewal=auto_renewal,
|
|
|
strict=True,
|
|
|
)
|
|
|
|
|
|
def __repr__(self):
|
|
|
return "{}:{}".format(self.__class__.__name__, lock_key)
|
|
|
|
|
|
def __str__(self):
|
|
|
return "{}:{}".format(self.__class__.__name__, lock_key)
|
|
|
|
|
|
def __init__(self):
|
|
|
self.lock = self.get_lock()
|
|
|
self.lock_key = lock_key
|
|
|
|
|
|
def acquire(self, wait=True):
|
|
|
log.debug('Trying to acquire Redis lock for key %s', self.lock_key)
|
|
|
try:
|
|
|
acquired = self.lock.acquire(wait)
|
|
|
log.debug('Got lock for key %s, %s', self.lock_key, acquired)
|
|
|
return acquired
|
|
|
except redis_lock.AlreadyAcquired:
|
|
|
return False
|
|
|
except redis_lock.AlreadyStarted:
|
|
|
# refresh thread exists, but it also means we acquired the lock
|
|
|
return True
|
|
|
|
|
|
def release(self):
|
|
|
try:
|
|
|
self.lock.release()
|
|
|
except redis_lock.NotAcquired:
|
|
|
pass
|
|
|
|
|
|
return _RedisLockWrapper()
|
|
|
|
