Re: [Axiom-developer] Axiom crashing in Zope-Plone

[Bob McElrath]

The original version of runCommand (and your example below) fails if
your program creates a large amount of output.  I only discovered the
bug recently when re-rendering one of my pages with a lot of latex.

You should grab latexwiki from my repository::

    http://bob.mcelrath.org/darcs/latexwiki

which is the official source for that, then 'darcs pull' from::

    http://page.axiom-developer.org/repository

which has the axiom patches.  These will be integrated to latexwiki
eventually -- right now the axiom patches duplicate a lot of code
(including runCommand).  If someone wants to clean this up, I will
accept patches!  ;)  I've just been busy lately.  Physics comes first...

The fixed runCommand is::

    # Make our file descriptors nonblocking so that reading doesn't hang.
    def makeNonBlocking(f):
        fl = fcntl.fcntl(f.fileno(), FCNTL.F_GETFL)
        fcntl.fcntl(f.fileno(), FCNTL.F_SETFL, fl | os.O_NONBLOCK)
        
    def runCommand(cmdLine):
        program = popen2.Popen3('cd %s; '%(workingDir) + cmdLine, 1)
        program.tochild.close()
        makeNonBlocking(program.fromchild)
        makeNonBlocking(program.childerr)
        stderr = []
        stdout = []
        erreof = False
        outeof = False
        while(not (erreof and outeof)):
            readme, writme, xme = select.select([program.fromchild, 
program.childerr], [], [])
            for output in readme:
                if(output == program.fromchild):
                    text = program.fromchild.read()
                    if(text == ''): outeof = True
                    else: stdout.append(text)
                elif(output == program.childerr):
                    text = program.childerr.read()
                    if(text == ''): erreof = True
                    else: stderr.append(text)
        status = program.wait()
        error = os.WEXITSTATUS(status) or not os.WIFEXITED(status)
        return error, string.join(stdout, ''), string.join(stderr, '')

Hans Peter Wuermli address@hidden wrote:
> 
> Hi
> 
> I wonder if someone with the new Zope-Plone-LatexWiki experience can help me. 
> 
> Having been enthusiastic about MathAction I tried to set it up locally on my 
> local computer, too, using the ZWiki and LatexWiki files on 
> http://page.axiom-developer.org/repository. Strangely enough Axiom is not 
> rendered, as the method runCommand() in axiomWrapper.py fails when run from 
> inside Zope. Testing the method externally either within a zope.app() or as a 
> standalone method, does not produce errors and works as expected. 
> 
> I checked with a lot of analoguous situations, first suspecting missing 
> access 
> rights, but "wrapping", for example, an executable, a segfaulting executable 
> or a psql script run fine, standalone or within zope as external methods.
> 
> I can boil down the error to the external method "demo.py" at the end of the 
> mail, which is similar to the runCommand() in axiomWrapper.py. 
> 
> Zope is version 2.6.4; python used is version 2.2 and it all runs on a Debian 
> sarge system.
> 
> The exit codes for Popen3 when run from Zope are:
> 
> WEXITSTATUS:139 
> WIFEXITED: 1
> 
> Thank you for any help.
> 
> Cheers, H.P.
> 
> 
> demo.py:
> 
> import os
> from popen2 import Popen3
> 
> 
> axiomTemplate = r""")set output algebra off
> )set output tex on
> )set message autoload off
> )set quit unprotected
> integrate(x**2,x)
> )quit
> """
> 
> LatexWikiHome = '/usr/lib/zope/lib/python\
> /Products/LatexWiki/Extensions/'
> 
> axTinput = open ( LatexWikiHome + 'axT.input', 'w' )
> axTinput.write(axiomTemplate)
> axTinput.close()
> 
> cmdLine = r'export AXIOM=/usr/lib/axiom-0.20040831;\
> export PATH=$AXIOM/bin:$PATH;\
> AXIOMsys < %s ' %(LatexWikiHome + 'axT.input')
> 
> def echoWorld():
>     """ external method calling Popen3 """
>     p = Popen3 (cmdLine, 1, 4096)
>     status = p.wait()
>     p.tochild.close()
>     out = p.fromchild.read()
>     p.fromchild.close()
>     err = ''
>     if p.childerr: err = p.childerr.read(); p.childerr.close()
>     error = os.WEXITSTATUS(status) or \
>             not os.WIFEXITED(status)
>     if not error: return\
>            'Output: ' + out +\
>            '\nWEXITSTATUS: ' + str(os.WEXITSTATUS(status)) +\
>            '\nWIFEXITED:   ' + str(os.WIFEXITED(status))
>     else:  return\
>            'Error: ' + err +\
>            '\nOut: ' + out +\
>            '\nWEXITSTATUS:' + str(os.WEXITSTATUS(status)) +\
>            '\nWIFEXITED:   ' + str(os.WIFEXITED(status))
> 
> # For Zope external testing
> print echoWorld()
> 
> 
> _______________________________________________
> Axiom-developer mailing list
> address@hidden
> http://lists.nongnu.org/mailman/listinfo/axiom-developer
--
Cheers,
Bob McElrath [Univ. of California at Davis, Department of Physics]
    
    It is unpatriotic to question the Kleptocracy.

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