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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24 | # Revision 1.5 2004/06/10 22:42:06 jalet |
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25 | # Better messages in logs |
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26 | # |
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27 | # Revision 1.4 2004/05/24 22:45:49 jalet |
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28 | # New 'enforcement' directive added |
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29 | # Polling loop improvements |
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30 | # |
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31 | # Revision 1.3 2004/05/24 14:36:40 jalet |
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32 | # Revert to old polling loop. Will need optimisations |
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33 | # |
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34 | # Revision 1.2 2004/05/18 14:49:22 jalet |
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35 | # Big code changes to completely remove the need for "requester" directives, |
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36 | # jsut use "hardware(... your previous requester directive's content ...)" |
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37 | # |
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38 | # Revision 1.1 2004/05/13 13:59:30 jalet |
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39 | # Code simplifications |
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40 | # |
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41 | # |
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42 | # |
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43 | |
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44 | import sys |
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45 | import os |
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46 | import popen2 |
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47 | from pykota.accounter import AccounterBase, PyKotaAccounterError |
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48 | |
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49 | class Accounter(AccounterBase) : |
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50 | def __init__(self, kotabackend, arguments) : |
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51 | """Initializes querying accounter.""" |
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52 | AccounterBase.__init__(self, kotabackend, arguments) |
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53 | |
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54 | def getPrinterInternalPageCounter(self) : |
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55 | """Returns the printer's internal page counter.""" |
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56 | self.filter.logdebug("Reading printer's internal page counter...") |
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57 | try : |
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58 | counter = self.askPrinterPageCounter(self.filter.printerhostname) |
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59 | except PyKotaAccounterError, msg : |
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60 | # can't get actual page counter, assume printer is off or warming up |
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61 | # log the message anyway. |
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62 | self.filter.logger.log_message("%s" % msg, "warn") |
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63 | counter = None |
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64 | self.filter.logdebug("Printer's internal page counter value is : %s" % str(counter)) |
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65 | return counter |
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66 | |
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67 | def beginJob(self, userpquota) : |
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68 | """Saves printer internal page counter at start of job.""" |
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69 | # save page counter before job |
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70 | self.LastPageCounter = self.counterbefore = self.getPrinterInternalPageCounter() |
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71 | |
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72 | def endJob(self, userpquota) : |
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73 | """Saves printer internal page counter at end of job.""" |
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74 | # save page counter after job |
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75 | self.LastPageCounter = self.counterafter = self.getPrinterInternalPageCounter() |
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76 | |
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77 | def getJobSize(self) : |
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78 | """Returns the actual job size.""" |
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79 | try : |
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80 | jobsize = (self.counterafter - self.counterbefore) |
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81 | if jobsize < 0 : |
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82 | # Try to take care of HP printers |
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83 | # Their internal page counter is saved to NVRAM |
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84 | # only every 10 pages. If the printer was switched |
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85 | # off then back on during the job, and that the |
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86 | # counters difference is negative, we know |
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87 | # the formula (we can't know if more than eleven |
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88 | # pages were printed though) : |
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89 | if jobsize > -10 : |
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90 | jobsize += 10 |
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91 | else : |
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92 | # here we may have got a printer being replaced |
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93 | # DURING the job. This is HIGHLY improbable ! |
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94 | jobsize = 0 |
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95 | except : |
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96 | # takes care of the case where one counter (or both) was never set. |
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97 | jobsize = 0 |
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98 | return jobsize |
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99 | |
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100 | def askPrinterPageCounter(self, printer) : |
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101 | """Returns the page counter from the printer via an external command. |
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102 | |
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103 | The external command must report the life time page number of the printer on stdout. |
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104 | """ |
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105 | commandline = self.arguments.strip() % locals() |
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106 | if printer is None : |
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107 | raise PyKotaAccounterError, _("Unknown printer address in HARDWARE(%s) for printer %s") % (commandline, self.filter.printername) |
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108 | self.filter.logger.log_message(_("Launching HARDWARE(%s)...") % commandline, "info") |
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109 | error = 1 |
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110 | pagecounter = None |
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111 | child = popen2.Popen4(commandline) |
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112 | try : |
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113 | line = child.fromchild.readline() |
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114 | pagecounter = int(line.strip()) |
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115 | except ValueError : |
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116 | self.filter.logger.log_message(_("Incorrect answer : %s") % repr(line), "error") |
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117 | except IOError : |
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118 | # we were interrupted by a signal, certainely a SIGTERM |
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119 | # caused by the user cancelling the current job |
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120 | try : |
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121 | os.kill(child.pid, signal.SIGTERM) |
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122 | except : |
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123 | pass # already killed ? |
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124 | self.filter.logger.log_message(_("SIGTERM was sent to hardware accounter %s (pid: %s)") % (commandline, child.pid), "info") |
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125 | else : |
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126 | error = 0 |
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127 | child.fromchild.close() |
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128 | child.tochild.close() |
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129 | try : |
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130 | status = child.wait() |
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131 | except OSError, msg : |
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132 | self.filter.logdebug("Error while waiting for hardware accounter pid %s : %s" % (child.pid, msg)) |
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133 | error = 1 |
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134 | if (not error) and os.WIFEXITED(status) and (not os.WEXITSTATUS(status)) : |
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135 | return pagecounter |
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136 | else : |
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137 | raise PyKotaAccounterError, _("Unable to query printer %s via HARDWARE(%s)") % (printer, commandline) |
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138 | |
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