Re: [Zope] OSError along with FSSession...

2000-09-08 Thread Pavlos Christoforou

On Wed, 6 Sep 2000, Chien-Pin Wang wrote:

 
 Dear Zope Users:
 
  I have upgraded to FSSession 0.4.2 lately and occasionally run into
 the same problem several times. Each time it costs me a zope down. I do
 really need some help...
 
 
  Zope complains an error type "OSError" and throws the error value
 saying [Errno 21] Is a directory: '/usr/local/zope/var/FSSession/'
 occasionally since a recent upgrade of FSSession product to 0.4.2.


I have managed to reproduce the error by setting SessionUID to an empty
string before calling FSSession. Check for situations where you clear the
REQUEST variables before calling FSSession. In the meantime I will add
some checks on the input values of SessionUID.

I will probably release a fixed version during the weekend if not sooner.

Pavlos


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Re: [Zope] HappySession

2000-09-01 Thread Pavlos Christoforou

On Fri, 1 Sep 2000, Dieter Maurer wrote:

 I can tell you, that FSSession has the same problem, at least
 the version before the current one (announced some days ago).

FSSession has no longer such problem. However you might still loose data
if you access the same SessionUID from many frames. I don't thing there is
a general solution to the problem without involving read locks which will
slow down the whole Zope site. Or raising ConflictErrors which for frame
usage like the case you mention will occur very often. The same problem
will occur whether you store the Session info in an RDBMs or not. For
instance:

Thread A reads Session1
Thread B reads Session1
Thread A modifies Session1 and commits
Thread B modifies Session1 and commits.

This creates a conflict and the solution I have chosen is to keep the last
to commit. In general we can achieve very high write rates because there
is a natural isolation among requests, one thread per SessionUID. Problems
will occur if multiple concurrent requests try to access the same
SessionUID. This could occur in situations that employ frames but (at
least in our case) most of the time the Session info is required only in
one frame. In any case I have tested the latest version of FSSession
against multiple frames accessing the same SessionUID and I do not get
TransactionErrors.

Actually there is a slightly better way but it will involve a lot of
complicated programming so I won't even mention it ... :-)

Pavlos


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[Zope] [ANN] FSSession-0-4-2

2000-08-29 Thread Pavlos Christoforou

Hello Zopistas

FSSession 0-4-2 is available at:
http://www.zope.org/Members/gaaros/FSSession 

FSSession 0-4-2 corrects a
bug on Windows platforms where os.rename fails if the renamed file already
exists. This version has also been tested under many "unusual" situations
(calling FSSession twice, two users having the same SessionUID) and it
seems to be very robust.

Regards

Pavlos


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Re: [Zope] FSSession problems...

2000-08-28 Thread Pavlos Christoforou

On Mon, 28 Aug 2000, Curtis Maloney wrote:

 /dtml-if
 
 This was aparently working fine for quite some time (about a month of public 
 usage), until last week.  We have examined logs, and seen that one person 
 accidentaly used the system under someone elses ReturnerID, and then 
 rectified their mistake.

If he did rectify the mistake then that should not have resulted in a
problem. In any case the problem should have been isolated to that user
only. Could it be that the cookie is cached somewhere? I am not familiar
with the underlying pricinciples of the apache Proxy directives. 


Pavlos


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Re: [Zope] FSSession problems...

2000-08-25 Thread Pavlos Christoforou

On Fri, 25 Aug 2000, Curtis Maloney wrote:

 Greetings,
 
 I'm using FSSession to store login details about visitors to our site.  It is 
 important that users only be able to see their own data (of course).
 
 Today, however, I find out that some mistakes have been happening.  People 
 are finding themselves logged in when they haven't yet, and others finding 
 they're logged in as someone else.  This is, obivously, a problem.
 
 I cannot see how this could be happening, since the Session ID is stored in a 
 cookie, which should be unique to the client.
 
This is very weird indeed. Nobody has ever reported a similar problem. Can
you send me the DTML method that calls the FSSession? 

Pavlos


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Re: [Zope] REPOST: README.txt Tab

2000-08-04 Thread Pavlos Christoforou

On Fri, 4 Aug 2000 [EMAIL PROTECTED] wrote:

 I'll re-ask the question:
 
  How do I get the README tab to appear in a product?
  
  What do I need to do?

Its been a while but I think what you say is essentially correct. If there
is a README.txt it would be displayed assuming your product was
initialized correctly. Also make sure you delete the product from the
product management screen and restart Zope.

Pavlos


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Re: [Zope] FSSession - don't call FSSession twice!

2000-07-31 Thread Pavlos Christoforou

On Tue, 1 Aug 2000 [EMAIL PROTECTED] wrote:

 
 Zope has encountered an error while publishing this resource.
 
 Error Type: OSError
 Error Value: [Errno 2] No such file or directory
 
 
 from the title) that I called FSSession twice. Line 193 appears to
 rename a .tmp file and I'd guess that by calling it twice my second
 attempt fails as the file has already been renamed. Obviously this
 
 Hope this is of some use
 
 Ian
 

Ian 

Thanks for the report and the excellent analysis. Unfortunately I did not
consider the case of calling FSSession twice. During the last couple of
days I had a few suggestions (Brian and Dieter) on improving FSSession so
a new version soon.

Thanks

Pavlos



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Re: [Zope] FSSession used in Python???

2000-07-10 Thread Pavlos Christoforou

On Fri, 7 Jul 2000, Dan Narkiewicz wrote:

 inside my own python written Zope product... Any help would be.. well... 
 helpful..

I am not sure if it is a good idea to use a Product in the manner you
describe but in any case:

   --- a class definition ---
 def FStest(self):
 """fssession test"""
 self.a = FSSession()    error appears here


FSSession needs to be initialized with a cookie name, (whatever one wants
to call the cookie that will store the session id). 

self.a=FSSession('Danssession')

Still it might not work if FSSession cannot access REQUEST etc. Let me
know.

Pavlos




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Re: [Zope] Re: FSSession buglette

2000-07-07 Thread Pavlos Christoforou

On Fri, 7 Jul 2000, Paul Gresham wrote:

 Hi, Yep, I'm definitely running 0-4-0, I think the fact that I did
 something naughty caused the rename (and therefore the commit) to fail,
 when it expected to work. An exception in the commit then caused Zope to
 stop all commits. What is worrying is that someone much more naughty
 than I am, may just do something similar on our live system (Once this
 goes live)

Paul

When I was testing FSSession-0-4-0 before release I created all sorts of
weird situations and at least I got the impression that even under those
situations FSSession would behave ok. I suppose I could make it foolproof
by trying to serialize the contents everytime someone makes changes. This
would guarantee that no exception will be raised during commit, but as I
understand it it should be ok if an exception is raised during the first
phase of commit (ie during tpc_begin). Zope should remain in a consistent
state and the transaction machinery should clean up things ok, if
something bad happens during the first phase of commit. It is only if an
exception is raised in the second phase of commit that Zope refuses to
carry on more transactions. In any case please send me your setup that
creates such a problem with FSSession0.4.0 so I can look into it.

If you want to restrict the kind of objects that your users will store in
FSSession you could swap _dump and -load for the equivalent marshal ones.


Pavlos


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Re: [Zope-dev] ExtensionClass and __radd__()?

2000-07-06 Thread Pavlos Christoforou

On Wed, 5 Jul 2000, Greg Ward wrote:

 
 Well, it's a nice theory.  It doesn't explain why '__add__()' works for
 ExtensionClass while '__radd__()' does not; perhaps ExtensionClass
 implements that much of Python's class semantics, but doesn't go as far
 as '__radd__()'.
 

A quick note which you probably already know:

grep add ExtensionClass.c gives:

static PyObject *py__add__, *py__sub__, *py__mul__, *py__div__,
  INIT_PY_NAME(__add__); BINOP(add,Add)
  FILLENTRY(nm-nb, add, add, METH_VARARGS, "Add to another");
  FILLENTRY(sm-sq, concat, add, METH_VARARGS,
  SET_SPECIAL(add,add); subclass_add(PyObject *self, PyObject *v)
  UNLESS(m=subclass_getspecial(self,py__add__)) return NULL;
   AsCMethod(m)-meth==(PyCFunction)add_by_name
ASSIGN(m,AsCMethod(m)-type-tp_as_number-nb_add(self,v));
  (binaryfunc)subclass_add, /*nb_add*/
(binaryfunc)subclass_add, /*sq_concat*/
  return; /* we added a reference; don't delete now */ 

whereas grep radd ExtensionClass.c returns nothing


Pavlos


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Re: [Zope] basic FSSession question

2000-07-03 Thread Pavlos Christoforou

On Mon, 3 Jul 2000, Leichtman, David J wrote:


 overwrites
 the other data, implying that it's the same SessionUID. I thought that
 calling dtml-call FSSession from a different machine, would then 
 create a
 new session with the SessionUID stored on that machine. How, then, do 
 I get
 multiple sessions?

Yes it will create a new Session. I have not received such a complain in
the past so please check your setup carefully. If the problem persists can
you send me a description of your setup so I can try to recreate it?

 There seems to be a severe lack of documentation for FSSession.
 

Can you email me more specific suggestions as to where the docs need
improvement? 


Pavlos



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[Zope-dev] [ANN] FSSession-0-4-0

2000-06-29 Thread Pavlos Christoforou

FSSession 0-4-0 is available at:
http://www.zope.org/Members/gaaros/FSSession

FSSession 0-4-0 corrects a bug in the transaction management. Now
tpc_finish always succeeds and all the storing actions are performed in
tpc_begin. tpc_finish simply performs a 'rename' operation which is atomic
in Unix.

Pavlos


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Re: [Zope] Howto engineer a scientific paper system

2000-06-29 Thread Pavlos Christoforou

On Thu, 29 Jun 2000, [EMAIL PROTECTED] wrote:

 Thank you for the comments and links for latex and docbook.
 
 Going the latex path seems to me worthwhile - but on another day 
 ;-) ,  I have already done some setup in zope that I would like to
 build on.  What I did not find about LaTeX was a screenshot (isn't it

Having used latex for a long time I would like to point out that if you
are planing to to write many papers for conferences/publications Latex has
some very helpful tools. For one many scientific journals provide Latex
style files so you don't need to worry about formating. Also (and IMO the
most important) are the pain in the ... bib contents. There are very nice
bib databases for Latex and latex (or bibtex) can produce bibliography
contents in the formats required by most journals. Check also Lynx which
is a minimal (last i checked) wysiwig environment for Latex.

Pavlos 


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Re: [Zope] ZODB/FSSession TransactionError

2000-06-28 Thread Pavlos Christoforou

On Tue, 27 Jun 2000, Brian McClain wrote:

 In my original Zope installation, I'm still getting the same EOFError
 when I try to view a document containing dtml-call FSSession.  I
 have been unable to reproduce the original TransactionError in the
 original Zope.  I have mucked around with the 1st Zope since receiving
 this initial TransactionError - mostly removing var/Data.fs, etc.. and
 reinstalling FSSession etc... so that I could start "fresh".

You can correct the first Zope installation by doing the following.  
Remove dtml-call FSSession and instead use dtml-var SessionUID. This
will give you the problematic unpicklable session uid file and just remove
it. It should be ok after that. Don't spend time on it , I have a pretty
good idea what is going on. I hope by tonight to have a fixed version out.



Pavlos


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Re: [Zope] ZODB/FSSession TransactionError

2000-06-27 Thread Pavlos Christoforou

On Wed, 28 Jun 2000, Dieter Maurer wrote:

 
 That's strange, because Python usually indicates EOF by returning
 an empty string and not by raising EOFError.

cPickle returns EOFError which is confusing since the Python docs state
that only input and raw_input return this exception.

The problem is actually deeper than I previously thought. I am still not
sure whether it is FSSession that is causing it or Zope's transaction
manager. I will spend more time on it tomorrow. In any case if you delete
the offending FSSession file on the filesystem and restart Zope it should
be fine for now.

Pavlos 


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Re: [Zope] Re: FSSession newbie problem

2000-06-09 Thread Pavlos Christoforou

On Fri, 9 Jun 2000, Marcello Lupo wrote:

 dtml-var "FSSession('carrello')"br   It prints out "None"

I supose you mean  ...FSSession['carrello'] ..
 
 The FSSession is in the same folder of my two methods, may be this a
 problem?

No it should not

 one.
 Probably the second method point to a different session file than the
 first.

I also have dtml-call FSSession in my standard html header and I never
had problems. I will try a few tests when I return. Please keep me posted
if you continue having troubles.

Pavlos


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Re: [Zope] Re: FSSession newbie problem

2000-06-09 Thread Pavlos Christoforou

On Fri, 9 Jun 2000, Marcello Lupo wrote:


 
 1) Is necessary to call FSSession in every document of the site or is
 sufficient on the first page (home page of the e-com for example)?
  Becouse i noticed (obviously) that every time it open a file the HD.
 And i think this is a problem because every time it initialize a new
 session passing the new cookie to the Browser (i think).

Yes it is neccessary beacuse HTTP is stateless. It will only start a new
session if FSSession cannot find a valid UID either through a cookie or a
FORM or as part of te URL

 
 2) How may i change the value of an element in a dictionary contained in
 FSSession?
 
   Example: I have the object 'carrello' as in the examples before that
 contain a dictionary passed to it from the form.
   I store the quantity of the item ordered in the value
 'quantita_prodotto' in the object 'carrello'.
   If a user add another piece of that item i need to update the
 'quantita_prodotto' summing to it the new item.
   I think this is possible but i ignore the syntax to do this.
 

As you descripe in your example carrello is a dictinory. So one way is to
make quantitita_prodotto a list and append to it. Something like
untested

dtml-if "FSSession['carrillo'].has_key('quantita_prodotto')"
dtml-call 
"FSSession['carrillo']['quatita_prodotto'].append(REQUEST.form['quatita_prodotto'])"
dtml-else
!-- need to fake the = sign which cannot be used in DTML expr--
dtml-call "FSSession['carrillo'].update({'quatita_prodotto':[]})"

/dtml-if

plus some more logic to check if the variables are empty/correct etc ..

Pavlos


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Re: [Zope] Re: FSSession newbie problem

2000-06-09 Thread Pavlos Christoforou

On Fri, 9 Jun 2000, Hung Jung Lu wrote:

 Pavlos: this is the part that is confusing to newbies. FSSession can be made 
 in such a way that this initial call can be avoided. HappySession works that 

You are right. There is no real need for the initial call. It was
initially designed like this because I inherited directly from UserDict
and I was lazy to override every call to check whether FSSession was
initialized or not. Also and more important I wanted to be compatible with
SQLSession so the migrating users from one to the other will do so without
needing to change much of the code. The initial call is useful if you need
to pass parameters, like noCookie or _force_new_session etc etc.

Pavlos


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Re: [Zope] FSSession newbie problem

2000-06-07 Thread Pavlos Christoforou

Hi Marcello 

On Wed, 7 Jun 2000, Marcello Lupo wrote:

 and macically i obtain the same error.
 this is the code i used:
 dtml-call FSSession
 dtml-unless "FSSession.has_key('cart')"
 dtml-call "FSSession.set('cart',{})"
 /dtml-unless

 dtml-call "FSSession['carrello'].update(REQUEST.form)"
 

Shouldn't the above be:

dtml-call "FSSession['cart'].update(REQUEST.form)"


Pavlos


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Re: [Zope] SQLSession vs FSSession for ultra-high scalability andspeed.

2000-05-23 Thread Pavlos Christoforou

On Sun, 21 May 2000, chas wrote:

 Hi Folks,
 
 Sorry if this has been asked before, but can anybody 
 advise on FSSession vs SQLSession for:
 
 a) Speed.
 b) Scalability.
 

FSSession does not use ZODB to store data, but stores session pickles
directly on the harddisk. It will also update session info only if there
are modifications to the session object. Given OS file caching I would
not be supprised if FSSession is faster than any RDBMs based solution.
Also note that if you have to support many writes on the Session objects,
a filesystem provides a nice map from users -- files, which then utilizes
the 'high concurrency' provided by the FS. 

OTO an RDBMS maybe a more reliable datastore than the filesystem with
better consistency, recovery tools etc etc.
 
Also check whether SQLSession caches info. It used to hit the RDBMs for
every variable access which was very prohibitive for us, but Anthony
mentioned that he was changing that.

Since performance is going to be a major issue in your design I suggest
you run a small bechmark to test relative performance.

Pavlos


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