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try:
import aioredis
except ImportError: # pragma: no cover
aioredis = None
import json
import uuid
import warnings
from distutils.version import StrictVersion
from . import AbstractStorage, Session
class RedisStorage(AbstractStorage):
"""Redis storage"""
def __init__(self, redis_pool, *, cookie_name="AIOHTTP_SESSION",
domain=None, max_age=None, path='/',
secure=None, httponly=True,
key_factory=lambda: uuid.uuid4().hex,
encoder=json.dumps, decoder=json.loads):
super().__init__(cookie_name=cookie_name, domain=domain,
max_age=max_age, path=path, secure=secure,
httponly=httponly,
encoder=encoder, decoder=decoder)
if aioredis is None:
raise RuntimeError("Please install aioredis")
if StrictVersion(aioredis.__version__).version < (1, 0):
raise RuntimeError("aioredis<1.0 is not supported")
self._key_factory = key_factory
if isinstance(redis_pool, aioredis.pool.ConnectionsPool):
warnings.warn(
"using a pool created with aioredis.create_pool is deprecated"
"please use a pool created with aioredis.create_redis_pool",
DeprecationWarning
)
redis_pool = aioredis.commands.Redis(redis_pool)
elif not isinstance(redis_pool, aioredis.commands.Redis):
raise TypeError("Expexted aioredis.commands.Redis got {}".format(
type(redis_pool)))
self._redis = redis_pool
async def load_session(self, request):
cookie = self.load_cookie(request)
if cookie is None:
return Session(None, data=None, new=True, max_age=self.max_age)
else:
with await self._redis as conn:
key = str(cookie)
data = await conn.get(self.cookie_name + '_' + key)
if data is None:
return Session(None, data=None,
new=True, max_age=self.max_age)
data = data.decode('utf-8')
try:
data = self._decoder(data)
except ValueError:
data = None
return Session(key, data=data, new=False, max_age=self.max_age)
async def save_session(self, request, response, session):
key = session.identity
if key is None:
key = self._key_factory()
self.save_cookie(response, key,
max_age=session.max_age)
else:
if session.empty:
self.save_cookie(response, '',
max_age=session.max_age)
else:
key = str(key)
self.save_cookie(response, key,
max_age=session.max_age)
data = self._encoder(self._get_session_data(session))
with await self._redis as conn:
max_age = session.max_age
expire = max_age if max_age is not None else 0
await conn.set(self.cookie_name + '_' + key, data, expire=expire)
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