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Graham Dumpleton
graham.dumpleton at gmail.com
Tue Apr 1 05:57:06 EDT 2008
Read: http://www.dscpl.com.au/wiki/ModPython/Articles/IssuesWithSessionObjects Graham On 01/04/2008, Dominique.Holzwarth at ch.delarue.com <Dominique.Holzwarth at ch.delarue.com> wrote: > Hey Guys > > I was just playing around with the cPickle module to save some instance objects into binary files and 'offline' (normal python interpreter on local machine) it all works fine. However, when I try to do the same things under apache with mod_python I get a mod_python specific error... > > Here are my testing files: > > Pickletest.py > ******************************************************************************************************************* > from mod_python import apache > from mod_python import Session > import cPickle, pickle > > myModule = apache.import_module('~/test/dummyclass.py') > > secretText = "hallo" > > def index(req): > req.session = Session.FileSession(req, secret=secretText) > if req.session.is_new(): > myInstance = myModule.myClass() > myInstance.hit() > hits = str(myInstance.hitCounter) > myOtherInstance = myModule.myOtherClass() > myOtherInstance.hit() > randNum = str(myOtherInstance.randomNumber) > file = open('C:\\Program Files\\Apache Software Foundation\\Apache2.2\\test\\myInstances.pkl','wb') > cPickle.dump((myInstance, myOtherInstance), file) > file.close() > req.session.save() > return "Hits: "+hits+" Random Number: "+randNum > else: > file = open('C:\\Program Files\\Apache Software Foundation\\Apache2.2\\test\\myInstances.pkl','rb') > (myInstance, myOtherInstance) = cPickle.load(file) > file.close() > myInstance.hit() > myOtherInstance.hit() > hits = str(myInstance.hitCounter) > randNumber = str(myOtherInstance.randomNumber) > req.session['myInstances'] = (myInstance, myOtherInstance) > file = open('C:\\Program Files\\Apache Software Foundation\\Apache2.2\\test\\myInstances.pkl','wb') > cPickle.dump((myInstance, myOtherInstance), file) > file.close() > req.session.save() > return "Hits: "+hits+" Random Number: "+randNum+" old session" > ******************************************************************************************************************* > > This script does nothing more than saving / loading instance objects and displaying some sort of 'hit counter' > > Dummyclass.py > ******************************************************************************************************************* > import random > > class myClass: > def __init__(self): > self.attribute = 1 > self.text = "hello world" > self.hitCounter = 0 > > def hit(self): > self.hitCounter += 1 > > class myOtherClass: > def __init__(self): > self.otherAttribute = 2 > self.otherText = "goodbye world" > self.randomNumber = 0 > > def hit(self): > self.randomNumber = random.randint(0, 1000) > ******************************************************************************************************************* > Defines some useless classes, of which instance objects should be stored :-) > > The script manages to write the *.pkl file which looks like this: > > myInstances.pkl > ******************************************************************************************************************* > ((i_mp_bee88a136571a696398a0eb82b06eeb3 > myClass > p1 > (dp2 > S'attribute' > p3 > I1 > sS'hitCounter' > p4 > I1 > sS'text' > p5 > S'hello world' > p6 > sb(i_mp_bee88a136571a696398a0eb82b06eeb3 > myOtherClass > p7 > (dp8 > S'otherText' > p9 > S'goodbye world' > p10 > sS'otherAttribute' > p11 > I2 > sS'randomNumber' > p12 > I105 > sbt. > ******************************************************************************************************************* > > As I understand the pickle-algorithm this file looks as intended except for the i_mp_bee88a136571a696398a0eb82b06eeb3 which normaly would be the name of the module. Obviously the module name is converted into some mod_python GUID thingy... > > The error message i get is the following: > > MOD_PYTHON ERROR > > ProcessId: 3784 > Interpreter: 'xx' > > ServerName: 'xx' > DocumentRoot: 'C:/Program Files/Apache Software Foundation/Apache2.2/htdocs' > > URI: '/python/test/pickletest.py' > Location: None > Directory: 'C:/Program Files/Apache Software Foundation/Apache2.2/htdocs/python/' > Filename: 'C:\\Program Files\\Apache Software Foundation\\Apache2.2\\htdocs\\python\\test\\pickletest.py' > PathInfo: '' > > Phase: 'PythonHandler' > Handler: 'mod_python.publisher' > > Traceback (most recent call last): > > File "C:\Program Files\Python25\lib\site-packages\mod_python\importer.py", line 1537, in HandlerDispatch > default=default_handler, arg=req, silent=hlist.silent) > > File "C:\Program Files\Python25\lib\site-packages\mod_python\importer.py", line 1229, in _process_target > result = _execute_target(config, req, object, arg) > > File "C:\Program Files\Python25\lib\site-packages\mod_python\importer.py", line 1128, in _execute_target > result = object(arg) > > File "C:\Program Files\Python25\lib\site-packages\mod_python\publisher.py", line 213, in handler > published = publish_object(req, object) > > File "C:\Program Files\Python25\lib\site-packages\mod_python\publisher.py", line 425, in publish_object > return publish_object(req,util.apply_fs_data(object, req.form, req=req)) > > File "C:\Program Files\Python25\lib\site-packages\mod_python\util.py", line 554, in apply_fs_data > return object(**args) > > File "C:\Program Files\Apache Software Foundation\Apache2.2\htdocs\python\test\pickletest.py", line 25, in index > (myInstance, myOtherInstance) = cPickle.load(file) > > ImportError: No module named _mp_bee88a136571a696398a0eb82b06eeb3 > > > MODULE CACHE DETAILS > > Accessed: Tue Apr 01 11:05:33 2008 > Generation: 26 > > _mp_bee88a136571a696398a0eb82b06eeb3 { > FileName: 'C:\\Program Files\\Apache Software Foundation\\Apache2.2\\htdocs\\python\\test\\dummyclass.py' > Instance: 1 > Generation: 13 > Modified: Tue Apr 01 09:59:54 2008 > Imported: Tue Apr 01 10:05:22 2008 > } > > _mp_754c5030ce462c9ea7741cb6f66d6cc1 { > FileName: 'C:\\Program Files\\Apache Software Foundation\\Apache2.2\\htdocs\\python\\test\\pickletest.py' > Instance: 13 > Generation: 26 > Modified: Tue Apr 01 10:56:58 2008 > Imported: Tue Apr 01 10:57:10 2008 > Children: 'C:\\Program Files\\Apache Software Foundation\\Apache2.2\\htdocs\\python\\test\\dummyclass.py' > } > > Is there a way how to use cPickle AND mod_python together? I also tried to use the session mechanism instead of the pickle mechanism to store instance objects in a binary file but that doesn't seem to work either (if I do a req.session['myInstances'] = (myInstance, myOtherInstance) then the session doesn't seem to be saved properly and thus, everytime I hit on browser-reload a new session is generated...) > > Would be really great if someone could help me with this! > > Greetings Dominique > > > _______________________________________________ > Mod_python mailing list > Mod_python at modpython.org > http://mailman.modpython.org/mailman/listinfo/mod_python >
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