mirror of
https://github.com/PiBrewing/craftbeerpi4.git
synced 2024-11-26 08:55:28 +01:00
72 lines
2.8 KiB
Python
72 lines
2.8 KiB
Python
|
import json
|
||
|
|
import uuid
|
||
|
|
from time import time
|
||
|
|
from . import AbstractStorage, Session
|
||
|
|
|
||
|
|
|
||
|
|
class MemcachedStorage(AbstractStorage):
|
||
|
|
"""Memcached storage"""
|
||
|
|
|
||
|
|
def __init__(self, memcached_conn, *, 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)
|
||
|
|
self._key_factory = key_factory
|
||
|
|
self.conn = memcached_conn
|
||
|
|
|
||
|
|
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:
|
||
|
|
key = str(cookie)
|
||
|
|
stored_key = (self.cookie_name + '_' + key).encode('utf-8')
|
||
|
|
data = await self.conn.get(stored_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))
|
||
|
|
max_age = session.max_age
|
||
|
|
# https://github.com/memcached/memcached/wiki/Programming#expiration
|
||
|
|
# "Expiration times can be set from 0, meaning "never expire", to
|
||
|
|
# 30 days. Any time higher than 30 days is interpreted as a Unix
|
||
|
|
# timestamp date. If you want to expire an object on January 1st of
|
||
|
|
# next year, this is how you do that."
|
||
|
|
if max_age is None:
|
||
|
|
expire = 0
|
||
|
|
elif max_age > 30*24*60*60:
|
||
|
|
expire = int(time()) + max_age
|
||
|
|
else:
|
||
|
|
expire = max_age
|
||
|
|
stored_key = (self.cookie_name + '_' + key).encode('utf-8')
|
||
|
|
await self.conn.set(
|
||
|
|
stored_key, data.encode('utf-8'),
|
||
|
|
exptime=expire)
|