root / pykota / trunk / pykota / accounters / software.py @ 1743

# PyKota
# -*- coding: ISO-8859-15 -*-
#
# PyKota - Print Quotas for CUPS and LPRng
#
# (c) 2003-2004 Jerome Alet <alet@librelogiciel.com>
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
#
# $Id$
#
# $Log$
# Revision 1.11  2004/09/24 21:19:48  jalet
# Did a pass of PyChecker
#
# Revision 1.10  2004/08/31 23:29:53  jalet
# Introduction of the new 'onaccountererror' configuration directive.
# Small fix for software accounter's return code which can't be None anymore.
# Make software and hardware accounting code look similar : will be factorized
# later.
#
# Revision 1.9  2004/08/25 22:34:39  jalet
# Now both software and hardware accounting raise an exception when no valid
# result can be extracted from the subprocess' output.
# Hardware accounting now reads subprocess' output until an integer is read
# or data is exhausted : it now behaves just like software accounting in this
# aspect.
#
# Revision 1.8  2004/08/22 14:04:47  jalet
# Tries to fix problem with subprocesses outputting more datas than needed
#
# Revision 1.7  2004/08/06 13:45:51  jalet
# Fixed french translation problem.
# Fixed problem with group quotas and strict enforcement.
#
# Revision 1.6  2004/07/01 19:56:43  jalet
# Better dispatching of error messages
#
# Revision 1.5  2004/06/10 22:42:06  jalet
# Better messages in logs
#
# Revision 1.4  2004/06/02 21:51:14  jalet
# Moved the sigterm capturing elsewhere
#
# Revision 1.3  2004/05/24 22:45:49  jalet
# New 'enforcement' directive added
# Polling loop improvements
#
# Revision 1.2  2004/05/18 14:49:23  jalet
# Big code changes to completely remove the need for "requester" directives,
# jsut use "hardware(... your previous requester directive's content ...)"
#
# Revision 1.1  2004/05/13 13:59:30  jalet
# Code simplifications
#
#

import os
import popen2
from pykota.accounter import AccounterBase, PyKotaAccounterError

class Accounter(AccounterBase) :
    def computeJobSize(self) :    
        """Feeds an external command with our datas to let it compute the job size, and return its value."""
        self.filter.printInfo(_("Launching SOFTWARE(%s)...") % self.arguments)
        MEGABYTE = 1024*1024
        self.filter.jobdatastream.seek(0)
        child = popen2.Popen4(self.arguments)
        try :
            data = self.filter.jobdatastream.read(MEGABYTE)    
            while data :
                child.tochild.write(data)
                data = self.filter.jobdatastream.read(MEGABYTE)
            child.tochild.flush()
            child.tochild.close()    
        except (IOError, OSError), msg :    
            msg = "%s : %s" % (self.arguments, msg) 
            self.filter.printInfo(_("Unable to compute job size with accounter %s") % msg)
        
        pagecounter = None
        try :
            answer = child.fromchild.read()
        except (IOError, OSError), msg :    
            msg = "%s : %s" % (self.arguments, msg) 
            self.filter.printInfo(_("Unable to compute job size with accounter %s") % msg)
        else :    
            lines = [l.strip() for l in answer.split("\n")]
            for i in range(len(lines)) : 
                try :
                    pagecounter = int(lines[i])
                except (AttributeError, ValueError) :
                    self.filter.printInfo(_("Line [%s] skipped in accounter's output. Trying again...") % lines[i])
                else :    
                    break
        child.fromchild.close()
        
        try :
            status = child.wait()
        except OSError, msg :    
            self.filter.printInfo(_("Problem while waiting for software accounter pid %s to exit : %s") % (child.pid, msg))
        else :    
            if os.WIFEXITED(status) :
                status = os.WEXITSTATUS(status)
            self.filter.printInfo(_("Software accounter %s exit code is %s") % (self.arguments, str(status)))
            
        if pagecounter is None :    
            message = _("Unable to compute job size with accounter %s") % self.arguments
            if self.onerror == "CONTINUE" :
                self.filter.printInfo(message, "error")
            else :
                raise PyKotaAccounterError, message
            
        self.filter.logdebug("Software accounter %s said job is %s pages long." % (self.arguments, repr(pagecounter)))
        return pagecounter or 0