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ScoDoc-Front/ZopeProducts/exUserFolder/UserCache/UserCache.py

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2020-09-26 16:19:37 +02:00
#
# Extensible User Folder
#
# (C) Copyright 2000,2001 The Internet (Aust) Pty Ltd
# ACN: 082 081 472 ABN: 83 082 081 472
# All Rights Reserved
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# Author: Andrew Milton <akm@theinternet.com.au>
# $Id: UserCache.py,v 1.16 2003/07/10 21:11:26 akm Exp $
# Module Level Caches for Various User Operations
from time import time
from BTrees.OOBTree import OOBTree
import threading
from Acquisition import aq_inner
from Products.exUserFolder.User import User
class UserCacheItem:
lastAccessed=0
def __init__(self, username, password, cacheable):
self.username=username
self.password=password
self.cacheable=cacheable
self.lastAccessed=time()
def touch(self):
self.lastAccessed=time()
def __repr__(self):
return self.username
class NegativeUserCacheItem(UserCacheItem):
def __init__(self, username):
self.username=username
self.lastAccessed=time()
class AdvancedCookieCacheItem(UserCacheItem):
lastAccessed=0
def __init__(self, username, password):
self.username=username
self.password=password
self.lastAccessed=time()
class SessionExpiredException(Exception):
'User Session Expired'
class UserCache:
def __init__(self, sessionLength):
self.sessionLength=sessionLength
self.cache=OOBTree()
self.hits=0
self.fail=0
self.nouser=0
self.attempts=0
self.timeouts=0
self.cacheStarted=time()
self.lock=threading.Lock()
def addToCache(self, username, password, User):
self.lock.acquire()
try:
if not self.sessionLength:
return
try:
u = self.cache.items(username)
if u:
for x in self.cache[username]:
self.cache.remove(x)
except:
pass
u = UserCacheItem(username, password, User._getCacheableDict())
self.cache[username]=u
finally:
self.lock.release()
def getUser(self, caller, username, password, checkpassword=1):
self.lock.acquire()
try:
if not self.sessionLength:
return None
self.attempts=self.attempts+1
u = None
try:
u = self.cache[username]
except KeyError:
self.nouser=self.nouser+1
return None
now = time()
if u:
if checkpassword and (u.password != password):
self.fail=self.fail+1
del self.cache[u.username]
elif self.sessionLength and (
(now - u.lastAccessed) > self.sessionLength):
del self.cache[u.username]
self.timeouts=self.timeouts+1
user_object=User(u.cacheable,
caller.currentPropSource,
caller.cryptPassword,
caller.currentAuthSource,
caller.currentGroupSource)
user_object.notifyCacheRemoval()
del u
raise SessionExpiredException
else:
u.touch()
self.hits=self.hits+1
return User(u.cacheable,
caller.currentPropSource,
caller.cryptPassword,
caller.currentAuthSource,
caller.currentGroupSource)
self.nouser=self.nouser+1
return None
finally:
self.lock.release()
def removeUser(self, username):
self.lock.acquire()
try:
if not self.sessionLength:
return
try:
if self.cache[username]:
del self.cache[username]
except:
pass
finally:
self.lock.release()
def getCacheStats(self):
self.lock.acquire()
try:
return (
{'attempts':self.attempts,
'hits':self.hits,
'fail':self.fail,
'misses':self.nouser,
'cachesize':len(self.cache),
'time':self.cacheStarted,
'timeouts':self.timeouts,
'length':self.sessionLength})
finally:
self.lock.release()
def getCurrentUsers(self, caller):
self.lock.acquire()
try:
x=[]
now = time()
for z in self.cache.keys():
u = self.cache[z]
if self.sessionLength and (
(now - u.lastAccessed) > self.sessionLength):
del self.cache[u.username]
self.timeouts=self.timeouts+1
user_object=User(u.cacheable,
caller.currentPropSource,
caller.cryptPassword,
caller.currentAuthSource,
caller.currentGroupSource)
user_object.notifyCacheRemoval()
del u
else:
x.append({'username':u.username,
'lastAccessed':u.lastAccessed})
return x
finally:
self.lock.release()
class NegativeUserCache:
def __init__(self, sessionLength):
self.sessionLength=sessionLength
self.cache=OOBTree()
self.hits=0
self.cacheStarted=time()
self.lock=threading.Lock()
def addToCache(self, username):
self.lock.acquire()
try:
if not self.sessionLength:
return
try:
u = self.cache.items(username)
if u:
for x in self.cache[username]:
self.cache.remove(x)
except:
pass
u = NegativeUserCacheItem(username)
self.cache[username]=u
finally:
self.lock.release()
def getUser(self, username):
self.lock.acquire()
try:
if not self.sessionLength:
return 0
u = None
try:
u = self.cache[username]
except KeyError:
return 0
now = time()
if u:
if self.sessionLength and (
(now - u.lastAccessed) > self.sessionLength):
del self.cache[u.username]
else:
# We don't touch negative user caches
# u.touch()
self.hits=self.hits+1
return 1
return 0
finally:
self.lock.release()
def removeUser(self, username):
self.lock.acquire()
try:
if not self.sessionLength:
return
try:
del self.cache[username]
except:
pass
finally:
self.lock.release()
class CookieCache:
def __init__(self, sessionLength):
self.sessionLength=sessionLength
self.cache=OOBTree()
self.hits=0
self.cacheStarted=time()
self.lock=threading.Lock()
def addToCache(self, username, password, key):
self.lock.acquire()
try:
if not self.sessionLength:
return
try:
u = self.cache.items(key)
if u:
for x in self.cache[key]:
self.cache.remove(x)
except:
pass
u = AdvancedCookieCacheItem(username, password)
self.cache[key]=u
finally:
self.lock.release()
def getUser(self, key):
self.lock.acquire()
try:
if not self.sessionLength:
return None
u = None
try:
u = self.cache[key]
except KeyError:
return None
now = time()
if u:
if self.sessionLength and (
(now - u.lastAccessed) > self.sessionLength):
del self.cache[key]
else:
# We don't touch negative user caches
# u.touch()
self.hits=self.hits+1
return u.username, u.password
return None
finally:
self.lock.release()
def removeUser(self, key):
self.lock.acquire()
try:
if not self.sessionLength:
return
try:
del self.cache[key]
except:
pass
finally:
self.lock.release()
class GlobalUserCache:
caches={}
def __init__(self):
self.lock = threading.Lock()
def createCache(self, who, sessionLength):
self.lock.acquire()
try:
self.caches[who]=UserCache(sessionLength)
return self.caches[who]
finally:
self.lock.release()
def getCache(self, who):
self.lock.acquire()
try:
if self.caches.has_key(who):
return self.caches[who]
else:
return None
finally:
self.lock.release()
def deleteCache(self, who):
self.lock.acquire()
try:
del self.caches[who]
finally:
self.lock.release()
class GlobalNegativeUserCache:
caches={}
def __init__(self):
self.lock = threading.Lock()
def createCache(self, who, sessionLength):
self.lock.acquire()
try:
self.caches[who]=NegativeUserCache(sessionLength)
return self.caches[who]
finally:
self.lock.release()
def getCache(self, who):
self.lock.acquire()
try:
if self.caches.has_key(who):
return self.caches[who]
else:
return None
finally:
self.lock.release()
def deleteCache(self, who):
self.lock.acquire()
try:
del self.caches[who]
finally:
self.lock.release()
class GlobalAdvancedCookieCache:
caches={}
def __init__(self):
self.lock = threading.Lock()
def createCache(self, who, sessionLength):
self.lock.acquire()
try:
self.caches[who]=CookieCache(sessionLength)
return self.caches[who]
finally:
self.lock.release()
def getCache(self, who):
self.lock.acquire()
try:
if self.caches.has_key(who):
return self.caches[who]
else:
return None
finally:
self.lock.release()
def deleteCache(self, who):
self.lock.acquire()
try:
del self.caches[who]
finally:
self.lock.release()