mirror of
https://github.com/PiBrewing/craftbeerpi4.git
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71 lines
2.8 KiB
Python
71 lines
2.8 KiB
Python
import json
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import uuid
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from time import time
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from . import AbstractStorage, Session
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class MemcachedStorage(AbstractStorage):
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"""Memcached storage"""
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def __init__(self, memcached_conn, *, cookie_name="AIOHTTP_SESSION",
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domain=None, max_age=None, path='/',
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secure=None, httponly=True,
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key_factory=lambda: uuid.uuid4().hex,
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encoder=json.dumps, decoder=json.loads):
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super().__init__(cookie_name=cookie_name, domain=domain,
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max_age=max_age, path=path, secure=secure,
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httponly=httponly,
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encoder=encoder, decoder=decoder)
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self._key_factory = key_factory
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self.conn = memcached_conn
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async def load_session(self, request):
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cookie = self.load_cookie(request)
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if cookie is None:
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return Session(None, data=None, new=True, max_age=self.max_age)
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else:
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key = str(cookie)
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stored_key = (self.cookie_name + '_' + key).encode('utf-8')
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data = await self.conn.get(stored_key)
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if data is None:
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return Session(None, data=None,
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new=True, max_age=self.max_age)
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data = data.decode('utf-8')
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try:
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data = self._decoder(data)
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except ValueError:
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data = None
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return Session(key, data=data, new=False, max_age=self.max_age)
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async def save_session(self, request, response, session):
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key = session.identity
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if key is None:
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key = self._key_factory()
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self.save_cookie(response, key,
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max_age=session.max_age)
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else:
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if session.empty:
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self.save_cookie(response, '',
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max_age=session.max_age)
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else:
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key = str(key)
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self.save_cookie(response, key,
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max_age=session.max_age)
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data = self._encoder(self._get_session_data(session))
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max_age = session.max_age
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# https://github.com/memcached/memcached/wiki/Programming#expiration
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# "Expiration times can be set from 0, meaning "never expire", to
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# 30 days. Any time higher than 30 days is interpreted as a Unix
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# timestamp date. If you want to expire an object on January 1st of
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# next year, this is how you do that."
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if max_age is None:
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expire = 0
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elif max_age > 30*24*60*60:
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expire = int(time()) + max_age
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else:
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expire = max_age
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stored_key = (self.cookie_name + '_' + key).encode('utf-8')
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await self.conn.set(
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stored_key, data.encode('utf-8'),
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exptime=expire)
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