# PyKota # -*- coding: ISO-8859-15 -*- # # PyKota - Print Quotas for CUPS and LPRng # # (c) 2003 Jerome Alet # 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 1.9 2003/11/21 14:28:45 jalet # More complete job history. # # Revision 1.8 2003/11/12 23:29:24 jalet # More work on new backend. This commit may be unstable. # # Revision 1.7 2003/10/07 09:07:28 jalet # Character encoding added to please latest version of Python # # Revision 1.6 2003/09/04 07:57:18 jalet # Problem with Python 2.3 fixed : a bug of me. # # Revision 1.5 2003/07/07 11:49:24 jalet # Lots of small fixes with the help of PyChecker # # Revision 1.4 2003/06/25 14:10:01 jalet # Hey, it may work (edpykota --reset excepted) ! # # Revision 1.3 2003/05/27 23:00:21 jalet # Big rewrite of external accounting methods. # Should work well now. # # Revision 1.2 2003/05/13 13:54:20 jalet # Better handling of broken pipes # # Revision 1.1 2003/05/07 19:47:06 jalet # v1.07 Release of the Shame is out ! # # # import sys import os import popen2 import tempfile from pykota.accounter import AccounterBase, PyKotaAccounterError class Accounter(AccounterBase) : def beginJob(self, printer, user) : """Saves the computed job size.""" # computes job's size self.JobSize = self.computeJobSize() # get last job information for this printer if not printer.LastJob.Exists : # The printer hasn't been used yet, from PyKota's point of view self.LastPageCounter = 0 else : # get last job size and page counter from Quota Storage # Last lifetime page counter before actual job is # last page counter + last job size self.LastPageCounter = int(printer.LastJob.PrinterPageCounter or 0) + int(printer.LastJob.JobSize or 0) def endJob(self, printer, user) : """Do nothing.""" pass def getJobSize(self) : """Returns the actual job size.""" try : return self.JobSize except AttributeError : return 0 def doAccounting(self, printer, user) : """Deletgates the computation of the job size to an external command. The command must print the job size on its standard output and exit successfully. """ self.beginJob(printer, user) # get the job size, which is real job size * number of copies. jobsize = self.getJobSize() * self.filter.copies # Is the current user allowed to print at all ? userpquota = self.filter.storage.getUserPQuota(user, printer) action = self.filter.warnUserPQuota(userpquota) # update the quota for the current user on this printer, if allowed to print if action == "DENY" : jobsize = 0 else : userpquota.increasePagesUsage(jobsize) # adds the current job to history printer.addJobToHistory(self.filter.jobid, user, self.getLastPageCounter(), action, jobsize, self.filter.preserveinputfile, self.filter.title, self.filter.copies, self.filter.options) self.endJob(printer, user) return action def computeJobSize(self) : """Feeds an external command with our datas to let it compute the job size, and return its value.""" temporary = None if self.filter.inputfile is None : infile = sys.stdin # we will have to duplicate our standard input temporary = tempfile.TemporaryFile() else : infile = open(self.filter.inputfile, "rb") # launches external accounter # TODO : USE tempfile.mkstemp() instead ! Needs some work ! infilename = tempfile.mktemp() outfilename = tempfile.mktemp() errfilename = tempfile.mktemp() try : # feed it with our data fakeinput = open(infilename, "wb") data = infile.read(256*1024) while data : fakeinput.write(data) if temporary is not None : temporary.write(data) data = infile.read(256*1024) fakeinput.close() # launches child process command = "%s <%s >%s 2>%s" % (self.arguments, infilename, outfilename, errfilename) retcode = os.system(command) # check exit status if (os.WIFEXITED(retcode) and not os.WEXITSTATUS(retcode)) or os.stat(errfilename) : # tries to extract the job size from the external accounter's # standard output childoutput = open(outfilename, "r") try : pagecount = int(childoutput.readline().strip()) except (AttributeError, ValueError) : self.filter.logger.log_message(_("Unable to compute job size with external accounter %s") % self.arguments) pagecount = 0 childoutput.close() else : self.filter.logger.log_message(_("Unable to compute job size with external accounter %s") % self.arguments) pagecount = 0 os.remove(infilename) os.remove(outfilename) os.remove(errfilename) except IOError, msg : # TODO : temporary files may remain on the filesystem... msg = "%s : %s" % (self.arguments, msg) self.filter.logger.log_message(_("Unable to compute job size with external accounter %s") % msg) pagecount = 0 if temporary is not None : # this is a copy of our previous standard input # flush, then rewind temporary.flush() temporary.seek(0, 0) # our temporary file will be used later if the # job is allowed. self.filter.inputfile = temporary else : infile.close() return pagecount