使用MongoDB来实现web.py的session存储
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
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), x), [(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}})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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