[4suite] 4Suite Reliance on ENVIRONMENT & global variables

Mongryong Mongryong at sympatico.ca
Tue Jan 21 07:19:24 CET 2003


Ok, I've modified my simple test script so that it can be easily started
from a shell (python main.py) as well as working with mod_python.

Again, here's the url to my server where you can view the mod_python
result: http://rezquest.cjb.net/bin/main

So, now the test outputs the XML source as just a string and as dom node
from NonvalidatingReader.

You should clearly see the difference between the standalone and
mod_python results.

On Tue, 2003-01-21 at 00:23, Michael Olson wrote:
> 
> > The strange thing is that if I directly output the XML source without
> > doing any XSLT processing, the XML source appears correctly.  Somewhere
> > along the line where the strings are being passed from the python
> > libraries to the 4Suite libraries (by Py_ParseArgs..???), the strings
> > are being 'miscommunicated'.
> >
> 
> By "output the XML source" do you mean just print it out (or fetch it 
> from the file system) ro do you mean parse it into DOM, and print it 
> out?
> 
> If not the later, can you try that instead of XSLT to see if this works.
> 
> Thanks
> Mike
> 
> > Now, it might be a Python2.2.2 issue since libxml2/libxslt from the
> > gnome project are having similar problems as well.
> >
> > In 4Suite, do the apps embedd the python interpretor or do the apps
> > start purely from a python environment?
> >
> > It might be good to check to see whether this problem still occurs 
> > other
> > 'python embedded' application (ie. uses Py_NewInterpretor from C). I
> > forget, does the command-line version of python dynamically link to the
> > python libraries?  If so, I wonder if the command-line version of 
> > python
> > is doing anything special or different when it links up and initializes
> > the python libraries.
> >
> > I'm reposting this message on to the Python mailing list to see if
> > anybody there can help give us a clue.
> >
> > P.S Has there been any changes in Python2.2.3+ that might possibly fix
> > this problem?
> >
> > On Mon, 2003-01-20 at 22:28, Uche Ogbuji wrote:
> >> On Mon, 2003-01-20 at 14:52, Mongryong wrote:
> >>> Hi,
> >>>
> >>> I'm having trouble getting the latest 4Suite XML/XSLT tools to work 
> >>> the
> >>> way I want in mod_python and I know I'm not the first one to 
> >>> experience
> >>> "out-of-the-box" success.
> >>>
> >>> I've determined that it's an encoding issue.   Now, with a 
> >>> stand-alone
> >>> script or CGI script under Apache, 4XSLT works fine.  But under
> >>> mod_python (which doesn't have access to ENVIRONMENT variables), 
> >>> 4XSLT
> >>> library decodes the XML source file in a total different encoding.  
> >>> XSL
> >>> templates (ie. <xsl:template name="blah">) are never executed because
> >>> the XML tag is never recognized by the XSL processor.  Hence, you 
> >>> get an
> >>> empty output.
> >>>
> >>> I've check the default system encoding codec and it returns 'ascii' 
> >>> (ie.
> >>> sys.getdefaultencoding).  Now, it could be that the python library
> >>> relies on some ENVIRONMENT variable for its configuration.
> >>>
> >>> Anybody have any ideas what 'parameters' might not be initialized
> >>> properly under a non-CGI or non-shell environment such as mod_python?
> >>> Or, is there a parameter that one can set to change the XML input
> >>> decoding?
> >>
> >> I don't think there is any environment variable that could affect 
> >> this.
> >>
> >> However, there have been a lot of fixes recently, including to some
> >> endianness bugs.  Do you mind trying again with latest 4Suite CVS and
> >> telling us if it helps?  Either wait till tomorrow's snapshot, or 
> >> check
> >> out current CVS HEAD directly
> >>
> >> http://4suite.org/docs/4SuiteCVS.xml
> >>
> >> If it doesn't help, I hope you'll be able to help us work with you to
> >> find a solution for mod_python users.
> >>
> >> -- 
> >> Uche Ogbuji                                    Fourthought, Inc.
> >> http://uche.ogbuji.net    http://4Suite.org    http://fourthought.com
> >> Python Generators + DOM - 
> >> http://www.xml.com/pub/a/2003/01/08/py-xml.html
> >> 4Suite Repository Features - 
> >> https://www6.software.ibm.com/reg/devworks/dw-x4suite5-i/
> >> XML class warfare - http://www.adtmag.com/article.asp?id=6965
> >> MusicBrainz  metadata - 
> >> http://www-106.ibm.com/developerworks/xml/library/x-think14.html
> >>
> >
> > <main.py>
> Mike Olson                                Principal Consultant
> mike.olson at fourthought.com                +1 303 583 9900 x 102
> Fourthought, Inc.                         http://Fourthought.com
> PO Box 270590,                            http://4Suite.org
> Louisville, CO 80027-5009, USA
> XML strategy, XML tools, knowledge management
> 
> _______________________________________________
> 4suite mailing list
> 4suite at lists.fourthought.com
> http://lists.fourthought.com/mailman/listinfo/4suite

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