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AW: [Zope] Data.fs
by Mayer, Steven 14 Jan '02

14 Jan '02

Hi, Our Zope Version is 2.4.3 and Python 2.1, but our Linux Filesystem can?t work with files >2GB, this is the Problem! And there must be a reason that the data.fs increase, though nobody works on Zope...! But what?? And if our Filesystem can work with files >2GB there is anywhere a limit where the system can work. In a Year the Data.fs will reach the 6GB limit? We need a solution for our Data.fs, that it will not reach the 2GB limit. Regards Steven :) -----Ursprungliche Nachricht----- Von: kosh(a)aesaeion.com [mailto:kosh@aesaeion.com] Gesendet: Montag, 14. Januar 2002 10:06 An: Mayer, Steven Cc: zope(a)zope.org Betreff: Re: [Zope] Data.fs Switch to zope 2.4.3 and python 2.1.1 with large file support if possible. That will get rid of the 2GB size limit for zope since that is a python limit and in some cases an os limit though not on most of the recent ones.

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AW: [Zope] Data.fs
by Mayer, Steven 14 Jan '02

14 Jan '02

Hi, yes I have pack the Data.fs but the Size is still 1,75 GB and every 1 Minutes the Data.fs grows 1MB!! HELP, PLEASE! -----Ursprüngliche Nachricht----- Von: bak [mailto:kedai@kedai.com.my] Gesendet: Montag, 14. Januar 2002 10:19 An: Mayer, Steven; zope(a)zope.org Betreff: Re: [Zope] Data.fs On Monday 14 January 2002 04:54 pm, Mayer, Steven wrote: > Hi, > I´ve got a big problem with our Data.fs! The Size is >1,9GB and shortly our > System will crash again.... :( Can I split the Data.fs in several pieces? > Or can Zope work with only one Data.fs? I don´t understand that our Data.fs > increases, though nobody works on Zope, because I have set the permissions > that nobody can create or modifie a Document! Can somebody help me? Please! > :) have you tried packing Data.fs? if yes, check out kosh's reply hth

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Data.fs
by Mayer, Steven 14 Jan '02

14 Jan '02

Hi, I´ve got a big problem with our Data.fs! The Size is >1,9GB and shortly our System will crash again.... :( Can I split the Data.fs in several pieces? Or can Zope work with only one Data.fs? I don´t understand that our Data.fs increases, though nobody works on Zope, because I have set the permissions that nobody can create or modifie a Document! Can somebody help me? Please! :) Regards Steven Meyer

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ZopeObject2HTML (Reflection)
by zopestoller＠thomas-guettler.de 13 Jan '02

13 Jan '02

Has someone written a script which renders a zope object to HTML? I would like to know: which base classes this object has, which methods it has, which properties it has ... I think it is quite easy if you know python good. I am a python newbie. __members__ doesn't seem to work on my zope object (inherited from folder). Can someone help? guettli

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"Yellow Pages" product
by Jens Wolk 13 Jan '02

13 Jan '02

Hi everybody, I plan to implement a Zope product (possibly using the CMF) which allows to publish so called "Yellow Pages". Three questions arise: 1) Is the name zyp already taken? zyp - short for Zope Yellow Pages - seems to be a nice name for the project. Does any other Zope project already use this name? Does it mean anything not-so-nice in English or any other language (in German "Zyp" doesn't mean anything)? 2) What Zope products exist which implement something similar? Until now I know only "Yihaw Folder" (http://www.zope.org/Members/EIONET/YihawDirectory) which is almost but not completely different from what I intend to do ;-) 3) Sourceforge I plan to use the sourceforge rescources for this project. Is this a bad idea? Can anybody suggest a better place? Thank you very much for your patience. Yours. Jens Wolk, Berlin

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Re: [Zope] ANNOUNCEMENT: New Zope-based Public Site
by Tim Owen 13 Jan '02

13 Jan '02

Milos, I have not experienced this problem nor has a few of the others who tested the site. iMeme - who we use for hosting - uses Apache as the web server in front of Zope and ZEO for load balancing. What browser are you using (I have tested under Netscape 6.2 and IE 5.5)? Has anyone else experienced a similar issue? Thanks for the feedback. Date: Thu, 10 Jan 2002 19:52:11 +0100 From: Milos Prudek <milos.prudek(a)tiscali.cz> To: zope(a)zope.org Subject: Re: [Zope] ANNOUNCEMENT: New Zope-based Public Site Tim Owen wrote: > > Hi Zopistas, > > Just wanted to let you know that there is a new Zope/MySQL based public site > out now. It is release 1.0 so the features are still somewhat limited. > iResolve.com is located at www.iresolve.com and is a free community site Some bad news for you... Your site VERY often returns incomplete pages. Reload is frequently neccessary Since your site probably suffered very increased traffic due to your announcement... could the fact that you are using ZServer (instead of some form of Apache proxy) be the reason for these problems? Opinions, anyone? -- Milos Prudek ___________________ Tim Owen Cell: 517.285.7071 Home: 989.224.4905 eFax: 425.940.5905

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Re: [Zope] Print error_traceback from script (python)
by Tim Hicks 13 Jan '02

13 Jan '02

<Re-sent as the first attempt doesn't seem to have made it to the list> > > I have a script (python) that has various try/except clauses in it. I would > > like to be able to get hold of the traceback from within the except block so > > that I can (optionally) send it as an argument to a user-friendly page > > summarising how the last lot of transactions went. > The "README" tab in the PythonScripts product description > (of, if you prefer, the corresponding file in "Products/PythonScripts") > tells you how to make modules and functions available in > PythonScripts (i.e. lose security restrictions). > > To print the traceback, you need "sys.exc_info" and functions > from the traceback module (e.g. "print_exception"). Look > at the Python documentation, for details. > Further to Dieter's advice, I have created a 'customImports' product with the following __init__.py script: ---Begin __init__.py--- from Products.PythonScripts.Utility import allow_module, allow_class from AccessControl import ModuleSecurityInfo, ClassSecurityInfo from Globals import InitializeClass allow_module('traceback') ModuleSecurityInfo('sys').declarePublic('exc_info') ---End __init__.py--- This has allowd me to get hold of the traceback and exception/error information that I was after. I am just wondering if I've left myself open to security issues by allowing these modules/part-modules in my python scripts. I read that 'sys' is a particular worry, so is there anything bad that can happen by allowing 'exc_info'? And what about allowing the 'traceback' module? cheers tim ps Here is how I use the modules in my script (python). Does this look appropriate? (N.B. aaatest is a ZSQL method) ---Begin script--- from sys import exc_info import traceback try: context.aaatest() except: print context.standard_html_header(context, context.REQUEST) tuple = exc_info() print '<h3>%s</h3>' % tuple[0] print '<h3>%s</h3>' % str(tuple[1]) print traceback.extract_tb(tuple[2]) print context.standard_html_footer(context, context.REQUEST) return printed ---End script---

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Print error_traceback from script (python)
by Tim Hicks 13 Jan '02

13 Jan '02

Evening all, I have a script (python) that has various try/except clauses in it. I would like to be able to get hold of the traceback from within the except block so that I can (optionally) send it as an argument to a user-friendly page summarising how the last lot of transactions went. So, I tried... try: foo() except: tb = error_traceback() AND tb = context.error_traceback() AND tb = context.error_traceback AND tb = context.REQUEST['error_traceback'] all of which fail with any of keyerror, attributeError and possibly some others. Am I even in the right ball-park here? Can I do this? If I'm honest, I don't really know how to do it in straight python, let alone these limited scripts. Thanks if you can help, tim

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ANN: New product for managing relations
by maxm 13 Jan '02

13 Jan '02

It is stable and functional, but only used in one project. So I considder it version 0.0.1. http://www.zope.org/Members/maxm/productList/mxmRelations/ ------------------------------------------------ This is the mxmRelations product It is made to solve a few common problems with Zope's object oriented database. Normally in a relational database some tables will be used to show relations between rows. It can be both "one to many", and "many to many". In Zope, doing the same thing is more difficult than it has to be. The usual way of doing relations in Zope is by using the list widget in a zClass, or to store the relations in a home made list or dictionary for the pupose. There is several problems with this approach. Let's take an examle. The students in classes example Imagine a school with several classes and several students. Some of the students wil take some of the classes. So theres is a relation between some students, and some classes. A simple structure for this in Zope would be to have two folders "classes" and "students":: classes/ class_1 class_2 class_3 ... etc. students/ student_1 student_2 student_3 student_4 Ordinarily in zope you would then write two classes something like:: class Klass: # hmmm, stupid example def __init__(self, id, title): self.id = id self.title = title self.students_in_class = [] class Student: # hmmm, stupid example def __init__(self, id, title): self.id = id self.title = title self.taking_classes = [] The problem is that the two classes have to maintain the same relations. So the picture could be like:: class_1.students_in_class = ['student_1', 'student_2'] class_2.students_in_class = ['student_3', 'student_4'] class_3.students_in_class = ['student_1', 'student_4'] Or you might even keep backwards relations so that you can easily see whitch students takes which classes:: student_1.taking_classes = ['class_1','class_3'] student_2.taking_classes = ['class_1'] student_3.taking_classes = ['class_2'] student_4.taking_classes = ['class_2','class_3'] This is the bad situation where you have to keep two otherwise unrelated sets of relations up to date. In some cases the objects might even be spread out in different folders. Then it can get real ugly fast. You get direct paths in the code, duplication of code and functionality. So then you want to make a listwidget where the user can select which classes that the students take:: <select name="students_in_class:list" multiple> <dtml-in "students.objectValues()"> <option value="<dtml-var "getId()">"><dtml-var "title_or_id()"></option> </dtml-in> </select> And you want those selected to be hilited:: <select name="students_in_class:list" multiple> <dtml-in "students.objectValues()"> <option<dtml-if "getId() in taking_classes" > selected</dtml-if > value="<dtml-var "getId()">"><dtml-var "title_or_id()"></option> </dtml-in> </select> Here is another problem. What if a student drops out, and is deleted from Zope, but is still in some of the "students_in_class" list under some of the class objects. How do we remove the dead relations? One way is to make code ignoring objects no longer in existance:: <select name="students_in_class:list" multiple> <dtml-in "students.objectValues()"> <dtml-try> <option<dtml-if "getId() in taking_classes" > selected</dtml-if > value="<dtml-var "getId()">"><dtml-var "title_or_id()"></option> <dtml-except> </dtml-try> </dtml-in> </select> But that's not really a solution is it? And you have to do it for each and every object that reference another object. Again repetition of code and functionality. Another problem is that a student also can be referenced in the student councel, the school mailinglist, the holiday list etc. Suddenly an object can be related to many different objects. And all of then have to have the same code doing the relational-housholding stuff. Boring! So here's my solution The mxmRelations product handles all the relations. Shows only the valid ones, and deletes the dead and rotten ones. It has a very simple API with only five methods:: ######################################################## # Public methods. def relate(objs1, objs2): """ Sets relations between objects. If there allready is a key it appende the relations else it creates a new key with a list of relations """ def unrelate(objs1, objs2): """ Removes relations between objects """ def delete(obj): """ Removes all references to the object. Used ie. if an object is deleted. """ def get(obj, meta_types=None): """ Returns all relations to this object, or an empty list """ def getSmartList(self, obj, objects, meta_types=None): """ returns a list of objects with parameters (id, title, path, selected) Very usable for making selection widgets, or lists of checkboxes. "obj" is the object that we are looking for relations too. "objects" is a list of objects that we want to know whether they are related to "obj". """ So now the site from before will have the following structure:: relations_class_students # instance of the relation product classes/ class_1 class_2 class_3 ... etc. students/ student_1 student_2 student_3 student_4 And the code to make a list widget is:: <select name="students_in_class:list" multiple> <dtml-in "relations_class_students.getSmartList(this(), students.objectValues())" sort=id> <option value="<dtml-var path>"<dtml-if selected > selected</dtml-if>><dtml-var title></option> </dtml-in> </select>

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Tiny Tables Follow-Up
by Wade Pearce 13 Jan '02

13 Jan '02

As a follow-up to my request, I'd like to thank those that replied. After delving more deeply, we discovered that the Data.fs file had become corrupt. After using fsrecover.py on the file (which cut the last 50KB of transactions), we attempted to resurrect our site. We are somewhat confused as to what happened, but we're trying to find out what. The main reason is that logically, what has happened shouldn't. Here is what we did: With our proper Data.fs file corrupt, we were using an emergency Data.fs which has basic necessities and information. The corrupt Data.fs was named Data.fs.2312 (for when it crashed). The emergency Data.fs was 240MB in size and Data.fs.2312 was 660MB in size. 1) Copied Data.fs.2312 to Data.fs.recover and ran fsrecover.py on it 2) Stopped Zope 3) Moved Data.fs (the emergency copy) to a backup directory. 4) Renamed Data.fs.recover to Data.fs and restarted Zope. The site remained down and inoperative. 5) Stopped Zope. Renamed Data.fs to Data.fs.recover and move Data.fs back from the backup directory. Restarted Zope. 6) Checked the site...and the proper site came up (which was supposed to be in Data.fs.recover). The server has now been running since Friday afternoon with the full site operational. I have tested it. I can add items within the manage screens, the server owner can create export files and the site shows full operatability with the Postgres database behind it. We're waiting for a quiet time to reboot the machine to see if it reverts. We have a suspicion that the site we are viewing is in the cache memory, but as we've never experienced this before, we're kinda stabbing in the dark. Does anybody have any suggestions as to what has happened here? The Data.fs file Zope is supposed to be accessing is the 240MB file. For the life of us, we're stumped. Any ideas, suggestions or speculations welcome. Thanks Wade Pearce Wedge Tail Eagles Australasian Net Gaming Association (http://wtecommand.com) "Powered by Zope"

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