forked from mmerickel/anykeystore
/
redis.py
63 lines (50 loc) · 1.89 KB
/
redis.py
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from __future__ import absolute_import
from anykeystore.compat import pickle
from anykeystore.interfaces import KeyValueStore
from anykeystore.utils import coerce_timedelta
class RedisStore(KeyValueStore):
""" Simple storage via Redis.
:param db: The name of the redis database.
:param host: Redis server host.
:param port: Redis server port.
:param key_prefix: Key prefix to avoid colliding with other parts of
the redis key/value store.
:param backend_api: Specific redis implementation to use.
"""
def __init__(self, db=0, host='localhost', port=6379,
key_prefix='anykeystore.', backend_api=None):
self.host = host
self.port = int(port)
self.db = int(db)
self.key_prefix = key_prefix or ''
self.backend_api = backend_api
@classmethod
def backend_api(cls):
return __import__('redis')
def _make_key(self, key):
return '%s%s' % (self.key_prefix, key)
_pool = None
def _get_conn(self):
"""The Redis connection, cached for this call"""
api = self.backend_api
if self._pool is None:
self._pool = api.ConnectionPool(
host=self.host, port=self.port, db=self.db)
return api.Redis(connection_pool=self._pool)
def retrieve(self, key):
data = self._get_conn().get(self._make_key(key))
if data:
return pickle.loads(data)
raise KeyError
def store(self, key, value, expires=None):
key = self._make_key(key)
c = self._get_conn()
c.set(key, pickle.dumps(value, protocol=pickle.HIGHEST_PROTOCOL))
if expires is not None:
expires = coerce_timedelta(expires)
c.expire(key, expires.seconds)
def delete(self, key):
self._get_conn().delete(self._make_key(key))
def purge_expired(self):
pass
backend = RedisStore