lxml + mod_python: cannot unmarshal code objects in restricted execution mode

[Dmitri Fedoruk]

Hello everyone,

I'm developing a mod_python application that is based on XML\XSLT
transforming.

I used 4Suite libraries for that, but as the speed was unacceptable
for me, I switched to lxml. Everything became much easier and 10 times
faster, but I've encountered the subject problem.

In brief - all my data and xslt are stored and transferred in UTF-8.
With 4Suite everything was fine all the time. With lxml it works fine
from the console, but inside mod_python it occasionaly dies, ~ one
time out of three. Strange - the same code with the same data works or
dies by its own means.

As far as I have found, there was a similar problem with PyXML and
encodings module, but there was no clear solution.

So, my configuration is the following:
Python 2.5.1
Server version: Apache/2.2.4 (FreeBSD)
mod_python-3.3.1

And the relevant parts of my code are these:

def extApplyXslt(xs lt, data, logger ):
try:
strXslt = urllib2.urlopen (xslt).read()
# i have to read the xslt url to the python string
except urllib2.HTTPErr or, e:
.......
except urllib2.URLErro r, e:
.............
try:
xslt_parser = etree.XMLParser ()
xslt_parser.res olvers.add( PrefixResolver( "XSLT") )

# and now I have to use the string; a more elegant solution,
anyone?
f = StringIO(strXsl t)
xslt_doc = etree.parse(f, xslt_parser)

# and here where the problem comes
transform = etree.XSLT(xslt _doc)

except Exception, exc:
logger.log(logg ing.CRITICAL, exc.__str__() )

try:
result_tree = transform(data)
return etree.tostring( result_tree, 'utf-8')
except Exception, exc:
print "xslt processing error!", exc.__str__()
return ""

It dies with the message 'cannot unmarshal code objects in restricted
execution mode'. By profiling I detected the point where problem
occurs:
transform = etree.XSLT(xslt _doc)

So, I would be grateful for any suggestions how to get rid of this.
I'd really like to use lxml. Maybe I should initialize the xslt
processor in somehow other way?

Thanks in advance,
Dmitri

[Stefan Behnel]

Dmitri Fedoruk wrote:

def extApplyXslt(xs lt, data, logger ):
try:
strXslt = urllib2.urlopen (xslt).read()
# i have to read the xslt url to the python string
except urllib2.HTTPErr or, e:
.......
except urllib2.URLErro r, e:
.............
try:
xslt_parser = etree.XMLParser ()
xslt_parser.res olvers.add( PrefixResolver( "XSLT") )

# and now I have to use the string; a more elegant solution,
anyone?

Sure, lxml.etree can parse from file-like objects. Just hand in the result of
urlopen().

Apart from that, I saw that you found your way to the lxml mailing list, I'll
respond over there.

Stefan

[Dmitri Fedoruk]

On Sep 13, 5:05 pm, Dmitri Fedoruk <dfedo...@gmail .comwrote:

So, my configuration is the following:
Python 2.5.1
Server version: Apache/2.2.4 (FreeBSD)
mod_python-3.3.1

update:
lxml-1.3.4
libxslt-1.1.21
libxml2-2.6.29

[Dmitri Fedoruk]

On Sep 14, 3:04 am, Graham Dumpleton <Graham.Dumple. [e-mail]>
wrote:

Try forcing mod_python to run your code in the first interpreter
instance created by Python.
PythonInterpret er main_interprete r

Thank you very much, that solved the problem! A more detailed
discussion can also be found in the lxml-dev mailing list (
http://comments.gmane.org/gmane.comp...xml.devel/2942 )

Dmitri