April 2003 - Zope - Zope lists

How to modify 'title' of an object
by Rares Vernica 29 May '05

29 May '05

Hi, How can I modify the 'title' of an object in DTML? Thanks in advance, Rares _________________________________________________________________ Chat with friends online, try MSN Messenger: http://messenger.msn.com

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Zope Training : California, USA, Feb 18-21, 2003
by Munwar Shariff 30 May '04

30 May '04

Hi All, Zope Training is re-scheduled to start from Feb 18th,2003 instead of Feb 17th, 2003. We are pleased to announce that CIGNEX Technologies, Inc., a Zope® Corporation training partner, has scheduled Zope Training in San Jose, CA February 18 through February 21, 2003. Additional information and participation details are available at: http://www.cignex.com/site/Services/ZopeTraining/index_html Best regards, Munwar Shariff CTO, CIGNEX Technologies, Inc T: 408.501.0455 x303 "Digital Strategies. Defined. Implemented!"

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Dynamic script loading
by Pawel Lewicki 17 Nov '03

17 Nov '03

Hello, I don't know if my question is more zopish or pythonish. I have a Zope product. I had to add the specific functionality which is needed very rarely. I would be glad to import external module only when it is needed, do the job and free my mind and extra memory it consumed. How should I do that? I have to admit that I don't find myself as an experienced Python programmer. I just discover depths of this incredible language while extending my Zope product. Maybe anyone would help me with some relevant links. Thanx in advance, Pawel Lewicki

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Editing Question
by Simon 13 May '03

13 May '03

I am just starting to play around with Zope, and one thing that I would like to do it to provide custom editing interfaces for a page. What I am thinking is (as an example) an article or paper that has say, a title, an abstract, a body and a few other components. I am thinking that DTML Documents are the way to go for these components. What I would like to do it put next to each section, an "edit" button, the onclick handler will set the content-editable proprety of the associated text block to true, and will reveal save and undo buttons. This, I have no trouble with, but what I cannot see how to do in Zope, is to have the save button post the new content to the DTML document that it belongs in. Is there a good solution to this? Thanks in advance, Simon

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Accessing httplib from a Zope Python script
by Sean Winstead 08 May '03

08 May '03

Hi, I'm a Zope newbie who's more familiar with C# than Python. I've encountered an obstacle and am unable to find what's wrong with my approach. In order to solve the problem, I have searched this group's archive as well as other resources on the web. Some posts earlier this month were related to the problem but didn't address it exactly. I'm trying to implement support for PayPal Instant Payment Notification (IPN). IPN sends a POST to a URL on our Zope server. I decided to implement a Python script to handle the POST. The first task of the script is to send a POST back to PayPal in order to verify the transaction originated from PayPal. To do that, I learned that I could use the features in the httplib module. However, if I have a crappy test script like the following: import httplib result = httplib.HTTP("http://www.paypal.com/cgi-bin/webscr") return result Then I receive the following error when posting to the page: Error Type: Unauthorized Error Value: You are not allowed to access HTTP in this context In my search for help, I learned that Zope allows Script objects to access a subset of the Python modules, so I assumed that was the reason for the error. In my search for help, I happened upon some articles about using External methods to access modules. So I put the "result = httplib..." line into function verifyPayPal, module ipnSupport.py within the Zope\Extensions subfolder. I then added the extension to the same folder containing the Python script. The extension has ID ipnSupport, referening the specified script and function. When I run the following script... result = verifyPayPal return result The following error is returned: Error Type: NameError Error Value: global name 'verifyPayPal' is not defined The same error occurs if I call ipnSupport instead of verifyPayPal. If I try to import module ipnSupport then the following error is returned: Error Type: ImportError Error Value: import of "ipnSupport" is unauthorized So I guess my questions are: 1. Why can I not import httplib into a Zope Python script object? 2. Is an external method only callable from a DTML object? If it can be called from a script object, how do I do that? Thanks for any help or clues you can provide. -- Sean Winstead

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Re: [Zope] Network Appliances NetCache vs. Squid
by Marc Burgauer 07 May '03

07 May '03

Hi Scott, thanks for the reply! This is going to be a bit lengthy, as I tried to fully describe the problem at hand. Interestingly enough, I started out asking this list how I can determine best usage of the cache mechanisms built into Zope. There are two bottlenecks in the site. 1.) Images We are only responsible for programming and hosting of the site. The customer has chosen to give the HTML coding part of the work to a design agency. All pages, images and data are stored in the ZODB! We have trained the HTML coders (2 years ago) and written some tip sheets explicitly telling them to use absolute referencing for images from the root-level images-directory. However in a recent re-design of the site, they have ignored this advice and all images are now referenced relatively. In any bog standard web server environment, those paths wouldn't work. (As they are simply wrong.) But thanks to Zope inheritance, it just climbs up the directory tree and ultimately finds the images. So the coders never spotted their mistake. Example: The images are all stored in a root-level image directory or subdirectories of it: /images/navigation/home.gif /images/mainlogo.gif /images/navigation/news/nextitem.gif The site contains 45 "microsites" which have identical page-structure, the y have all the same pages, but different data. So each microsite has a news page. On such a news page all three images above are required. The HTML code for these images reads: <img src=images/navigation/home.gif ...> or <img src=images/mainlogo.gif ... > or <img src=images/navigation/news/nextitem.gif> The microsites are all root level directories. The news pages are in subdirectories of each microsite. The templates use "includes" for most of the page components and these includes are in the root. For example: newslisting.dtml /newyork/news/list /london/news/list /paris/news/list /munich/news/list A browser or proxy trying to cache things will resolve any of the images to be "local" to the news directory and not identify them all being the same image. So caching will only work for pages within the same subdirectory, but not across all pages on the site, even they all use the same logo. Obviously, I could go and edit the 100+ include files and fix the false referencing. However, that would only fix about half of the image-caching problem, as some images are stored in image folders within each microsite. Obviously, this task is labour intensive and I look for a quicker fix. Also, the person responsible for the site within the customer has changed and the new guy wants to change the site's look and feel in around 6 months (when he has new budget) to be less image rich. At the moment each page contains at least 30 images, most being albeit small. But as they are mainly text links rendered to images using a not-so-common font (Stone) we (me and the customer) agree that making the real text links in the next revamp will improve usability and speed up page load time. Is Zope's RAM cache manger going to help delivering the images here? Most of them are under 10Kb in size. Obviously the times saved would be fetching them from the ZODB on disk. 2.) Zope responding to request Zope is responding slowly to any initial request. You can see in the browser's status bar the "connecting to site" message for about 15-20 seconds before anything happens, at peak usage time this can go up to nearly a minute. The site is "busy" from around 6am to 1am, with a peak usage between 4pm and 7pm. I believe that the issue here is how many requests can be served in parallel. The box itself could serve more, neither CPU, RAM nor network are maxed out. CPU load is usually around 30% even at peak usage. So I was wondering if running ZEO and 2 instances of Zope pointing at the same ZODB on the same machine would improve things. Content changes frequently overall, but many pages don't change for weeks. Most pages are truly dynamic (i.e. content managed). Packing the database every night has not improved performance. And because of the true dynamic nature of the site I wonder how well a cache like squid would improve the site. (I have never done any caching, although recently read a lot about this.) We're using Zope 2.3 on a Solaris 8 server (Compaq, 2 P2 450MHz CPUs, RAID Disk array, 1 Gig of RAM). The box and OS has been chosen by the customer and there's no room for play currently. (OS is company policy and no money for another box.) We have developed a few "light-weight - very easy to use" content management products for Zope and have run into a few problems when testing them against Zope 2.5/2.6, hence we still stick with 2.3 for production sites until all bugs are fixed. Cheers Marc > Date: Mon, 28 Apr 2003 10:41:36 -0700 > From: Scott Burton <scott(a)posplugin.com> > Subject: Re: [Zope] Network Appliances NetCache vs. Squid > To: zope(a)zope.org > > Why do you really need to accelerate the site? > If you have a highly dynamic site, no acceleration appliances will work. > There may be a few things you can do on your end first to see if there is > something easy to do to your instance of Zope. > > Have you run profiling to see what is the bottleneck? Are there some > expensive scripts that may need some reworking for better performance? > Profiling can help with that. Do you efficiently use Zope's caching > mechanisms like caching templates and images in ram, or increasing the size > of the ZODB cache? What OS is running Zope? Could you proxy Apache in front > of Zope on the same machine using mod_cache to speed up images etc.? Could > you build a simple 1u Linux box with ZEO and Squid on it as the accelerator > for less than a netappliance? > > I would look into those things(if you haven't already) before worrying about > a caching/accelerator.

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NuxUserGroups question
by Zanotti Michele 06 May '03

06 May '03

Hi all, How can I obtain the list of local roles associated to a group? Thanks. Michele

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Create top-level folder
by Matt Ficken 06 May '03

06 May '03

Part of my product's job is to create a top-level folder. I can have it do that only when, from the management interface's "add function", I add it to the root directory. I would like it to always be able to go to the root directory, regardless of where its added. In order to do this, I need to access the root directory object, but I don't know how. What function can I call to return the root directory object? Would 'getPhysicalRoot' do what I want? if yes, what do I call it on? -- __________________________________________________________ Sign-up for your own FREE Personalized E-mail at Mail.com http://www.mail.com/?sr=signup

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How do I integrate zope with apache
by Mosquito 05 May '03

05 May '03

Hey there, I'm using linux 8.0 with KDE Desktop. I've got zope running on a medusa server at the moment, the one it came with. I've also got an apache server running and I was wondering how I can integrate the zope interface to be used with my linux apache server. I'm a total linux nub so go easy on me . ~Mosquito

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SESSION data lost
by Iutin Vyacheslav 03 May '03

03 May '03

Hello. My session data lost when I try to set expiration time to 0 (in 'session_data' object placed in 'temp_folder'). Any new objects in session do not live longer than several minutes (or ever several seconds). It is for Zope-2.6.0 and 2.6.1. In Zope-2.5.1 everything ok and objects stored in session while browser works. Has anybody such problem? Does know anybody why this thing happens?

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