FSSessionStore.py :  » Database » PyDO » skunkweb-3.4.4 » SkunkWeb » Services » sessionHandler » Python Open Source

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Python Open Source » Database » PyDO 
PyDO » skunkweb 3.4.4 » SkunkWeb » Services » sessionHandler » FSSessionStore.py
# Time-stamp: <2005-04-01 22:46:16 drew>
#  Copyright (C) 2001, 2003 Jacob Smullyan <smulloni@smullyan.org>
#  
#      You may distribute under the terms of either the GNU General
#      Public License or the SkunkWeb License, as specified in the
#      README file.
#   
########################################################################

import cPickle
import fcntl
import os
import time
from SkunkExcept import SkunkStandardError
from SkunkWeb import Configuration
from SkunkWeb.LogObj import DEBUG,logException
from SkunkWeb.ServiceRegistry import SESSIONHANDLER
from sessionHandler.Session import SessionStore

class Store(SessionStore):
    
    """
    a SessionStore implementation that stores session pickles in
    files, one per session.  Can only be used for standalone servers
    or in load-balancing setups where distributed sessions aren't
    necessary (which, given the fixed size of the SkunkWeb pool, is
    probably not a good fit). 
    """
    
    def __init__(self, id):
        self.id=id        
        _sesspath=Configuration.SessionHandler_FSSessionDir
        # if the session dir doesn't exist, try to create it
        if not os.path.exists(_sesspath):
            try:
                os.makedirs(_sesspath)
            except:
                msg="FSSessionStoreImpl needs to create writeable "\
                     "session directory %s" % _sesspath
                ERROR(msg)
                raise
        if not os.access(_sesspath, os.W_OK):
            raise SkunkStandardError, \
                  "FSSessionStoreImpl needs writeable session directory %s" \
                  % _sesspath
        self._picklepath=os.path.join(_sesspath, id)
        
    def load(self):
        return self._getPickle() or {}

    def lastTouched(self):
        try:
            atime=os.path.getatime(self._picklepath)
        except OSError:
            # file doesn't exist
            return int(time.time())
        else:
            return int(atime)

    def _getPickle(self):
        if os.path.exists(self._picklepath):
            try:
                data=cPickle.load(open(self._picklepath))
            except:
                logException()
                data={}
            return data
    
    def save(self, data):
        self._setPickle(data)

    def _setPickle(self, data):
        tmppath = self._picklepath + '.tmp'
        try:
            cPickle.dump(data, open(tmppath, 'w'), 1)
            os.rename(tmppath, self._picklepath)
        except:
            logException()
        
    def delete(self):
        os.remove(self._picklepath)
        
    def touch(self):
        curtime=time.time()
        os.utime(self._picklepath, (curtime, curtime))


FSSessionStoreImpl=Store
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