Created
November 9, 2010 06:41
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A Redis-based Django session store.
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import simplejson | |
from django.contrib.sessions.backends.base import SessionBase, CreateError | |
from django_ext.redis_helper import get_redis | |
class SessionStore(SessionBase): | |
""" | |
A Redis-based session store. | |
""" | |
def __init__(self, session_key=None): | |
self._redis = get_redis() | |
super(SessionStore, self).__init__(session_key) | |
def load(self): | |
session_data = self._redis.get('session:' + self.session_key) | |
if session_data is not None: | |
return simplejson.loads(session_data) | |
self.create() | |
return {} | |
def create(self): | |
for i in xrange(10000): | |
self.session_key = self._get_new_session_key() | |
try: | |
self.save(must_create=True) | |
except CreateError: | |
continue | |
self.modified = True | |
return | |
raise RuntimeError("Unable to create a new session key.") | |
def save(self, must_create=False): | |
if must_create: | |
func = self._redis.setnx | |
else: | |
func = self._redis.set | |
key = 'session:' + self.session_key | |
data = simplejson.dumps(self._get_session(no_load=must_create)) | |
result = func(key, data) | |
if must_create and not result: | |
raise CreateError | |
self._redis.expire(key, self.get_expiry_age()) | |
def exists(self, session_key): | |
if self._redis.exists('session:' + session_key): | |
return True | |
return False | |
def delete(self, session_key=None): | |
if session_key is None: | |
if self._session_key is None: | |
return | |
session_key = self._session_key | |
self._redis.delete('session:' + session_key) |
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