November 2003 - Zope

Re: [Zope] ZPT and CSS
by Andre Meyer 01 Dec '03

01 Dec '03

Something else must be wrong here. It works find as long as the style information is inside the zpt page, but referring to an external css file does not work for me. I found quite some references that this is not possible with zpt, only with dtml. Others claim it can be done. What is the secret behind doing this? On Sun, 2003-11-30 at 19:51, Tino Wildenhain wrote: > Hi Andre, > > Andre Meyer wrote: > > Dear Tino > > > > Thanks for your answer. I did indeed expect normal HTML and ZPT/Zope > > generate HTML to behave the same. However, when I open the same HTML > > file using "Open File..." in Mozilla it displays correctly using the CSS > > file which is in the same folder (~/zope/lib/python/Products/mlib/zpt). > > When I view this same HTML file through Zope > > (http://localhost:8080/music/index_html) it does not use the CSS file. > > Viewing both sources in Mozilla reveals that Zope inserts a base tag. > > That results in Mozilla not finding the CSS file. > > How can this be prevented? Or what is the right way to do it? > > As I said: you give a full qualified path to the resource, > e.g. <link rel="stylesheet" type="text/css" href="/mlib/zpt/mlib.css"/> > > This is always recommended because Zope is not a regular file based > web server but an object publisher! > > Regards > Tino Wildenhain > > > > > Here is what I have so far: > > > > ~/zope/lib/python/Products/mlib/zpt/index_html.zpt > > ============== > > <!DOCTYPE html > > PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" > > "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> > > <html> > > <head metal:define-macro="head"> > > <link rel="stylesheet" type="text/css" href="mlib.css"/> > > <title>Music Library</title> > > </head> > > <body bgcolor="white"> > > <div metal:define-macro="header"> > > <table border="0" cellspacing="0" cellpadding="6" > > width="100%"><tr><td bgcolor="#a0a0ff"><h1 > > tal:content="here/title_or_id">Title</h1></td></tr></table><br/> > > </div> > > ... > > ============== > > ~/zope/lib/python/Products/mlib/zpt/mlib.css > > ============== > > h1 > > { > > background-color: yellow; > > color: #666699; > > text-decoration: blink; > > } > > > > table > > { > > background-color: red; > > } > > ... > > > > On Sun, 2003-11-30 at 14:06, Tino Wildenhain wrote: > > > >>Hi Andre, > >> > >>Andre Meyer wrote: > >> > >>>Hi Zopers > >>> > >>>Trying to improve my ZPT pages I wanted to make use of Cascading Style > >>>Sheets (CSS). While the styles in my CSS file are properly rendered when > >>>I open the HTML file directly in the browser (Mozilla 1.4.1) they > >>>completely disappear when I view the same page through Zope!!! > >>>What is Zope doing? May it be that the CSS cannot be located because of > >>>the base url inserted by Zope? > >> > >>Beside possible and intended by you manipulations of the HTML > >>structure by means of TAL there is no difference between > >>The HTML you put in and the HTML you get out. > >> > >>After all, you can use "view source" in your web browser to check. > >> > >>As for links to embedded resources (images, scripts, styles) > >>you would preferably use root-relative links. That is: > >>links starting with / > >>Its not because it would not work - since it would work > >>with relative links quite well - you avoid multiple > >>versions appear in caches because of Zopes > >>acquisition. > >> > >>So, just check what you put in and what you really get back. > >>See if the mime-type of your CSS file is correct or > >>change it otherwise. > >> > >>We all use CSS with Zope since its definitively the way to go :) > >> > >>Regards > >>Tino Wildenhain > >> > > > > > >

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ANNOUNCE: Pound - reverse proxy and load balancer - v1.6
by Robert Segall 30 Nov '03

30 Nov '03

This is to announce the release of Pound v1.6. Changes in this version: - Callback for RSA ephemeral keys: - generated in a separate thread - used if required this will allow certain versions of IE to work correctly with Pound/SSL. - New X-SSL-cipher header encryption level/method - Added CheckURL parameter in config file - perform syntax check only if value 1 (default 0) - Allow for empty query/param strings in URL syntax - Additional SSL engine loading code - Added parameter for CA certificates - CA list is sent to client - Verify client certificates up to given depth - Fixed critical security vulnerability in syslog handling: this may allow a remote exploit, though none has been observed to date. The danger is minimised if you run Pound in a root-jail and/or as non-root user. Anyone using a version prior to 1.6 should upgrade as soon as possible. The software is at version 1.6 (production quality). Further testing (especially under heavy loads), improvements and suggestions are welcome. What is Pound (from the Web page) - a reverse-proxy: it passes requests from client browsers to one or more back-end servers. - a load balancer: it will distribute the requests from the client browsers among several back-end servers, while keeping session information. - an SSL wrapper: Pound will decrypt HTTPS requests from client browsers and pass them as plain HTTP to the back-end browsers. - an HTTP/HTTPS sanitizer: Pound will verify requests for correctness and accept only well-formed ones. - an HTTP/1.1 to 1.0 proxy. - a fail-over-server: should a back-end server fail, Pound will take note of the fact and stop passing requests to it until it recovers. - a request redirector - it will pass client requests to separate groups of servers, based on required URL and the presence or absence of headers (pattern matching) Pound was specifically developed to serve as a front-end for multiple instances of Zope running on top of a common ZEO storage, but can be used with any other web server. A patch for the Python source of z2.py is available as part of the distribution to allow using Pound's SSL capabilities. Pound is currently in use in several medium to large volume sites and seems to be holding up quite well: largest reported site does about 5.5 million requests per day, peaking at over 450 requests per second. The speed is well superior to other, equivalent solutions, the configuration is much simpler and the necessary resources (CPU, RAM, disk) are much, much lower. Pound is distributed under the GPL. For further information, download, etc. please see http://www.apsis.ch/pound Pound now has its own mailing-list - just send a message to pound-subscribe(a)apsis.ch in order to join. Enjoy and let me know how it works for you. -- Robert Segall Apsis GmbH Postfach, Uetikon am See, CH-8707 Tel: +41-1-920 4904

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Storing Roles in RDB with APE
by Elena Schulz 30 Nov '03

30 Nov '03

Hi, does anybody have experiences with storing roles in an external database with APE. What are possible problems with that. concerning stability, reliability etc. Are there other or better solutions storing roles externally. For the first step, only roles of one folder-object need to be stored. Is it possible, to store all roles of any folder externally. The informations about the roles should only be kept in the external database, so changes of the concerned table should change the roles in zope. -- Thanks for your answers, Elena

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source of zope.org
by Ulrich Wisser 30 Nov '03

30 Nov '03

Hi, while preparing the swedish zug site I want to include a list of swedish zope solution providers. Does anybody know if and where I could get the zope solution provider object used at zope.org? Regards Ulrich -- World Wide Web Publisher, Ulrich Wisser, Vallatorpsv.158, S-18752 Täby http://www.publisher.de Tel: +46-8-53460905 Fax: +46-8-534 609 06

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Using batch processing in DTML
by Mico Siahaan 30 Nov '03

30 Nov '03

Hi, suppose I have folder gallery that contains 40 photos. I want to make a DTML page that previews these photos. Suppose I want to load 15 photos each view and I want to arrange that 15 photos into 5 columns and 3 rows format... how do I accomplish that? I have read the example in Zope book about batch processing, but in my case I guess I have to make other loops in the batch loop ( 2 more loops I guess). But I am confused about the inner loops: over what object should the inner loops interate? Thanks. -- Mico Siahaan ------------- mico(a)intermatik.co.id

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Parsing a file through a Python script
by Pierre Godefroy 30 Nov '03

30 Nov '03

I am trying to parse a file with a Python script (the file is stored in the same folder as the script) : "marco" is the id of the file : data=str(container.marco) i=0 for line in data.readlines(): ..... I get a readlines : attribute error Could anyone help me? Sincerely, Pierre Godefroy

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Catch Object Changes
by Holger Schmidt 30 Nov '03

30 Nov '03

Hello, I have a list of objects. The list can contain objects like Folders, PropertyObjects or just every product that you have installed (but has to be accessible via the ZMI). My problem is that I want to do some XML-RPC to another Zope instance whenever some object of my list has changed (the XML-RPC depends on the object which has changed, that means that I also need to get the (commited?) changed object at this time). My idea to solve this problem: 1.) get to know when ANY object in Zope is changed 2.) check if this object is in my list 3.) if the list contains the object: start a thread managing the XML-RPC Problem is step 1 ... how can Zope tell me that ANY object is changed ...? I've heard that one solution would be to write my own storage but this would be very difficult ... Is there also an easier solution to my problem? -- Thanks, Holger P.S.: I probably will not manage to read any mail this weekend but would be very happy if I would receive (m)any solutions until sunday evening ;)

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ZPT and CSS
by Andre Meyer 30 Nov '03

30 Nov '03

Hi Zopers Trying to improve my ZPT pages I wanted to make use of Cascading Style Sheets (CSS). While the styles in my CSS file are properly rendered when I open the HTML file directly in the browser (Mozilla 1.4.1) they completely disappear when I view the same page through Zope!!! What is Zope doing? May it be that the CSS cannot be located because of the base url inserted by Zope? best wishes Andre

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Get out of DEBT!!
by K Reiersen 29 Nov '03

29 Nov '03

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Questions concerning development in Zope
by Iwan van der Kleyn 29 Nov '03

29 Nov '03

I work as senior developer/architect for a software development company in The Netherlands which focusses its activitites on web-development with J2EE, DOT.NET and PHP. Development in Zope/Python has never been an option for management because yet another platform would be too much of an investment considering Zope's minimal market share in Holland. Besides, the mindshare of Python at our premises is nill apart from myself. However, recently a customer has shown great interest in Zope (thanks to some slick presentation of Plone) and they are willing to make a signicant investment. I'm now in the rather weird position of having to win the sceptics over to join the Zope fray. To be perfectly honest, I have some lingering doubts and uncertainties. So therefore I would like to pose the following questions regarding development in Zope: * Zope is often criticised for its perceived lack of documentation. Although the current Zope book seems to have improved greatly, I still miss a good reference guide/book on advanded topics (the Development Guide seems to have stuck at version 2.4 and is rather limited). Which book(s) can fullfill this role? * Zope seems to lack a dominant development methodology/paradigm. DOT.NET has got form-based ASP.NET/ADO.NET, Java has MVC with Struts/J2EE, PHP has either form-based or MVC with Pear/Smarty. What shoudl I use in Zope? ZTP with Scripts? Or external Methods? ZCLasses? Products? * Releated to the former question: ASP.NET and PHP (through Pear) excell in easy (fast!) form-based development. What functionality can Zope offer? I've seen some references to a " Formulator" product. * Plone seems to be all the rage. But is Plone usable as an application framework? Can I use Plone for form-based, data-driven applications? * Thanks to Python's Global Interpreter Lock, Python programs don't scale well on SMP systems. Which is a "must have" in our situation. I' ve found some references to using ZEO to circumvent this, effectively running multiple instances of Zope on one server. Is there any documentation to be found on this subject? And how proven is this solution? * And finally (which makes me come across somowhat like a Troll, sorry about that :-). What is the "life expectancy" of Zope? Most of the hype regarding Zope seems to have died away somewhat. Recently its coming back in the slipstream of Plone. But realistically, what are the chances of Zope being a *relevant* application platform in a couple of years time? WIth "relevant" I mean: a platform which is well supported and keeps up with the compettition on *features*, not necessarilly market share. Many thanks, Iwan

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