使用MongoDB来实现web.py的session存储
web.py 是一个python的web开发框架,既然涉及到web开发,那么不可避免的可能使用到session,而传统的session存储基本都是默认在磁盘,当然考虑到web前端机的扩展我们经常需要重写session handler来自定义session的存储。下面就是在web.py框架中使用MongoDB作session存储的例子了。- from web.session import Store
- import time
- class MongoStore(Store):
- def __init__(self, db, collection_name):
- self.collection = db[collection_name]
- def __contains__(self, key):
- data = self.collection.find_one({'session_id':key})
- return bool(data)
- def __getitem__(self, key):
- now = time.time()
- s = self.collection.find_one({'session_id':key})
- if not s:
- raise KeyError
- else:
- s.update({'attime':now})
- return s
- def __setitem__(self, key, value):
- now = time.time()
- value['attime'] = now
- s = self.collection.find_one({'session_id':key})
- if s:
- value = dict(map(lambda x: (str(x[0]), x[1]), [(k,v) for (k,v) in value.iteritems() if k not in ['_id']]))
- s.update(**value)
- self.collection.save(s)
- else:
- self.collection.insert(value)
- def __delitem__(self, key):
- self.collection.remove({'session_id':key})
- def cleanup(self, timeout):
- timeout = timeout/(24.0*60*60) #timedelta takes numdays as arg
- last_allowed_time = time.time() - timeout
- self.collection.remove({'attime' : { '$lt' : last_allowed_time}})
复制代码 然后在app中替换掉使用磁盘进行存储的申明,用
session = web.session.Session(app, MongoStore(db, 'sessions'))替换掉:
session = web.session.Session(app, web.session.DiskStore('sessions'))来源:python.cn
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