[1475] | 1 | # PyKota |
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| 2 | # -*- coding: ISO-8859-15 -*- |
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| 3 | # |
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| 4 | # PyKota - Print Quotas for CUPS and LPRng |
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| 5 | # |
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| 6 | # (c) 2003-2004 Jerome Alet <alet@librelogiciel.com> |
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| 7 | # This program is free software; you can redistribute it and/or modify |
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| 8 | # it under the terms of the GNU General Public License as published by |
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| 9 | # the Free Software Foundation; either version 2 of the License, or |
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| 10 | # (at your option) any later version. |
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| 11 | # |
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| 12 | # This program is distributed in the hope that it will be useful, |
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| 13 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 15 | # GNU General Public License for more details. |
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| 16 | # |
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| 17 | # You should have received a copy of the GNU General Public License |
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| 18 | # along with this program; if not, write to the Free Software |
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| 19 | # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. |
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| 20 | # |
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| 21 | # $Id$ |
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| 22 | # |
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| 23 | # $Log$ |
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[1494] | 24 | # Revision 1.3 2004/05/24 14:36:40 jalet |
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| 25 | # Revert to old polling loop. Will need optimisations |
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| 26 | # |
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[1483] | 27 | # Revision 1.2 2004/05/18 14:49:22 jalet |
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| 28 | # Big code changes to completely remove the need for "requester" directives, |
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| 29 | # jsut use "hardware(... your previous requester directive's content ...)" |
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| 30 | # |
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[1475] | 31 | # Revision 1.1 2004/05/13 13:59:30 jalet |
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| 32 | # Code simplifications |
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| 33 | # |
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| 34 | # |
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| 35 | # |
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| 36 | |
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| 37 | import sys |
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| 38 | import os |
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[1483] | 39 | import popen2 |
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[1475] | 40 | from pykota.accounter import AccounterBase, PyKotaAccounterError |
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| 41 | |
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| 42 | class Accounter(AccounterBase) : |
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| 43 | def __init__(self, kotabackend, arguments) : |
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| 44 | """Initializes querying accounter.""" |
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| 45 | AccounterBase.__init__(self, kotabackend, arguments) |
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| 46 | self.isDelayed = 1 # With the pykota filter, accounting is delayed by one job |
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| 47 | |
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| 48 | def getPrinterInternalPageCounter(self) : |
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| 49 | """Returns the printer's internal page counter.""" |
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| 50 | self.filter.logdebug("Reading printer's internal page counter...") |
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| 51 | try : |
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[1483] | 52 | counter = self.askPrinterPageCounter(self.filter.printerhostname) |
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| 53 | except PyKotaAccounterError, msg : |
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[1475] | 54 | # can't get actual page counter, assume printer is off or warming up |
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| 55 | # log the message anyway. |
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| 56 | self.filter.logger.log_message("%s" % msg, "warn") |
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| 57 | counter = None |
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| 58 | self.filter.logdebug("Printer's internal page counter value is : %s" % str(counter)) |
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| 59 | return counter |
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| 60 | |
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| 61 | def beginJob(self, userpquota) : |
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| 62 | """Saves printer internal page counter at start of job.""" |
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| 63 | # save page counter before job |
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| 64 | self.LastPageCounter = self.counterbefore = self.getPrinterInternalPageCounter() |
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| 65 | |
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| 66 | def endJob(self, userpquota) : |
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| 67 | """Saves printer internal page counter at end of job.""" |
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| 68 | # save page counter after job |
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| 69 | self.LastPageCounter = self.counterafter = self.getPrinterInternalPageCounter() |
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| 70 | |
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| 71 | def getJobSize(self) : |
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| 72 | """Returns the actual job size.""" |
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| 73 | try : |
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| 74 | jobsize = (self.counterafter - self.counterbefore) |
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| 75 | if jobsize < 0 : |
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| 76 | # Try to take care of HP printers |
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| 77 | # Their internal page counter is saved to NVRAM |
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| 78 | # only every 10 pages. If the printer was switched |
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| 79 | # off then back on during the job, and that the |
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| 80 | # counters difference is negative, we know |
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| 81 | # the formula (we can't know if more than eleven |
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| 82 | # pages were printed though) : |
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| 83 | if jobsize > -10 : |
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| 84 | jobsize += 10 |
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| 85 | else : |
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| 86 | # here we may have got a printer being replaced |
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| 87 | # DURING the job. This is HIGHLY improbable ! |
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| 88 | jobsize = 0 |
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| 89 | except : |
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| 90 | # takes care of the case where one counter (or both) was never set. |
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| 91 | jobsize = 0 |
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| 92 | return jobsize |
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| 93 | |
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| 94 | def doAccounting(self, userpquota) : |
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| 95 | """Does print accounting and returns if the job status is ALLOW or DENY.""" |
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| 96 | # Get the page counter directly from the printer itself |
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| 97 | counterbeforejob = self.getPrinterInternalPageCounter() or 0 |
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| 98 | |
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| 99 | # Is the current user allowed to print at all ? |
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| 100 | action = self.filter.warnUserPQuota(userpquota) |
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| 101 | |
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| 102 | # adds the current job to history |
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| 103 | userpquota.Printer.addJobToHistory(self.filter.jobid, userpquota.User, counterbeforejob, action, filename=self.filter.preserveinputfile, title=self.filter.title, copies=self.filter.copies, options=self.filter.options) |
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| 104 | return action |
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[1483] | 105 | |
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| 106 | def askPrinterPageCounter(self, printer) : |
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| 107 | """Returns the page counter from the printer via an external command. |
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| 108 | |
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| 109 | The external command must report the life time page number of the printer on stdout. |
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| 110 | """ |
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| 111 | commandline = self.arguments.strip() % locals() |
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| 112 | if printer is None : |
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| 113 | raise PyKotaAccounterError, _("Unknown printer address in HARDWARE(%s) for printer %s") % (commandline, self.filter.printername) |
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| 114 | error = 1 |
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| 115 | pagecounter = None |
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| 116 | child = popen2.Popen4(commandline) |
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| 117 | try : |
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| 118 | pagecounter = int(child.fromchild.readline().strip()) |
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| 119 | except ValueError : |
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| 120 | pass |
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| 121 | except IOError : |
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| 122 | # we were interrupted by a signal, certainely a SIGTERM |
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| 123 | # caused by the user cancelling the current job |
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| 124 | try : |
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| 125 | os.kill(child.pid, signal.SIGTERM) |
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| 126 | except : |
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| 127 | pass # already killed ? |
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| 128 | self.filter.logger.log_message(_("SIGTERM was sent to hardware accounter %s (pid: %s)") % (commandline, child.pid), "info") |
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| 129 | else : |
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| 130 | error = 0 |
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| 131 | child.fromchild.close() |
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| 132 | child.tochild.close() |
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[1494] | 133 | try : |
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| 134 | status = child.wait() |
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| 135 | except OSError, msg : |
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| 136 | self.filter.logdebug("Error while waiting for hardware accounter pid %s : %s" % (child.pid, msg)) |
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| 137 | error = 1 |
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[1483] | 138 | if (not error) and os.WIFEXITED(status) and (not os.WEXITSTATUS(status)) : |
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| 139 | return pagecounter |
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| 140 | else : |
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| 141 | raise PyKotaAccounterError, _("Unable to query printer %s via HARDWARE(%s)") % (printer, commandline) |
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[1475] | 142 | |
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