mirror of
https://github.com/morpheus65535/bazarr
synced 2024-12-27 01:57:33 +00:00
144 lines
4.5 KiB
Python
144 lines
4.5 KiB
Python
import os
|
|
import threading
|
|
import time
|
|
import pickle
|
|
|
|
try:
|
|
import redis
|
|
except ImportError:
|
|
redis = None
|
|
|
|
from beaker.container import NamespaceManager
|
|
from beaker.synchronization import SynchronizerImpl
|
|
from beaker.util import SyncDict, machine_identifier
|
|
from beaker.crypto.util import sha1
|
|
from beaker._compat import string_type, PY2
|
|
|
|
|
|
class RedisNamespaceManager(NamespaceManager):
|
|
"""Provides the :class:`.NamespaceManager` API over Redis.
|
|
|
|
Provided ``url`` can be both a redis connection string or
|
|
an already existing StrictRedis instance.
|
|
|
|
The data will be stored into redis keys, with their name
|
|
starting with ``beaker_cache:``. So make sure you provide
|
|
a specific database number if you don't want to mix them
|
|
with your own data.
|
|
"""
|
|
MAX_KEY_LENGTH = 1024
|
|
|
|
clients = SyncDict()
|
|
|
|
def __init__(self, namespace, url, timeout=None, **kw):
|
|
super(RedisNamespaceManager, self).__init__(namespace)
|
|
self.lock_dir = None # Redis uses redis itself for locking.
|
|
self.timeout = timeout
|
|
|
|
if redis is None:
|
|
raise RuntimeError('redis is not available')
|
|
|
|
if isinstance(url, string_type):
|
|
self.client = RedisNamespaceManager.clients.get(url, redis.StrictRedis.from_url, url)
|
|
else:
|
|
self.client = url
|
|
|
|
def _format_key(self, key):
|
|
if not isinstance(key, str):
|
|
key = key.decode('ascii')
|
|
if len(key) > (self.MAX_KEY_LENGTH - len(self.namespace) - len('beaker_cache:') - 1):
|
|
if not PY2:
|
|
key = key.encode('utf-8')
|
|
key = sha1(key).hexdigest()
|
|
return 'beaker_cache:%s:%s' % (self.namespace, key)
|
|
|
|
def get_creation_lock(self, key):
|
|
return RedisSynchronizer(self._format_key(key), self.client)
|
|
|
|
def __getitem__(self, key):
|
|
entry = self.client.get(self._format_key(key))
|
|
if entry is None:
|
|
raise KeyError(key)
|
|
return pickle.loads(entry)
|
|
|
|
def __contains__(self, key):
|
|
return self.client.exists(self._format_key(key))
|
|
|
|
def has_key(self, key):
|
|
return key in self
|
|
|
|
def set_value(self, key, value, expiretime=None):
|
|
value = pickle.dumps(value)
|
|
if expiretime is None and self.timeout is not None:
|
|
expiretime = self.timeout
|
|
if expiretime is not None:
|
|
self.client.setex(self._format_key(key), int(expiretime), value)
|
|
else:
|
|
self.client.set(self._format_key(key), value)
|
|
|
|
def __setitem__(self, key, value):
|
|
self.set_value(key, value)
|
|
|
|
def __delitem__(self, key):
|
|
self.client.delete(self._format_key(key))
|
|
|
|
def do_remove(self):
|
|
for k in self.keys():
|
|
self.client.delete(k)
|
|
|
|
def keys(self):
|
|
return self.client.keys('beaker_cache:%s:*' % self.namespace)
|
|
|
|
|
|
class RedisSynchronizer(SynchronizerImpl):
|
|
"""Synchronizer based on redis.
|
|
|
|
Provided ``url`` can be both a redis connection string or
|
|
an already existing StrictRedis instance.
|
|
|
|
This Synchronizer only supports 1 reader or 1 writer at time, not concurrent readers.
|
|
"""
|
|
# If a cache entry generation function can take a lot,
|
|
# but 15 minutes is more than a reasonable time.
|
|
LOCK_EXPIRATION = 900
|
|
MACHINE_ID = machine_identifier()
|
|
|
|
def __init__(self, identifier, url):
|
|
super(RedisSynchronizer, self).__init__()
|
|
self.identifier = 'beaker_lock:%s' % identifier
|
|
if isinstance(url, string_type):
|
|
self.client = RedisNamespaceManager.clients.get(url, redis.StrictRedis.from_url, url)
|
|
else:
|
|
self.client = url
|
|
|
|
def _get_owner_id(self):
|
|
return (
|
|
'%s-%s-%s' % (self.MACHINE_ID, os.getpid(), threading.current_thread().ident)
|
|
).encode('ascii')
|
|
|
|
def do_release_read_lock(self):
|
|
self.do_release_write_lock()
|
|
|
|
def do_acquire_read_lock(self, wait):
|
|
self.do_acquire_write_lock(wait)
|
|
|
|
def do_release_write_lock(self):
|
|
identifier = self.identifier
|
|
owner_id = self._get_owner_id()
|
|
def execute_release(pipe):
|
|
lock_value = pipe.get(identifier)
|
|
if lock_value == owner_id:
|
|
pipe.delete(identifier)
|
|
self.client.transaction(execute_release, identifier)
|
|
|
|
def do_acquire_write_lock(self, wait):
|
|
owner_id = self._get_owner_id()
|
|
while True:
|
|
if self.client.setnx(self.identifier, owner_id):
|
|
self.client.pexpire(self.identifier, self.LOCK_EXPIRATION * 1000)
|
|
return True
|
|
|
|
if not wait:
|
|
return False
|
|
time.sleep(0.2)
|
|
|