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 | # |
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24 | |
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25 | import sys |
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26 | |
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27 | class PyKotaAccounterError(Exception): |
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28 | """An exception for Accounter related stuff.""" |
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29 | def __init__(self, message = ""): |
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30 | self.message = message |
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31 | Exception.__init__(self, message) |
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32 | def __repr__(self): |
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33 | return self.message |
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34 | __str__ = __repr__ |
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35 | |
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36 | class AccounterBase : |
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37 | """A class to account print usage by querying printers.""" |
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38 | def __init__(self, kotafilter, arguments) : |
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39 | """Sets instance vars depending on the current printer.""" |
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40 | self.filter = kotafilter |
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41 | self.arguments = arguments |
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42 | self.onerror = self.filter.config.getPrinterOnAccounterError(self.filter.printername) |
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43 | self.isSoftware = 1 # by default software accounting |
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44 | |
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45 | def getLastPageCounter(self) : |
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46 | """Returns last internal page counter value (possibly faked).""" |
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47 | try : |
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48 | return self.LastPageCounter or 0 |
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49 | except : |
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50 | return 0 |
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51 | |
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52 | def beginJob(self, printer) : |
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53 | """Saves the computed job size.""" |
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54 | # computes job's size |
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55 | self.JobSize = self.computeJobSize() |
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56 | if ((self.filter.printingsystem == "CUPS") \ |
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57 | and (self.filter.preserveinputfile is not None)) \ |
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58 | or (self.filter.printingsystem != "CUPS") : |
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59 | self.JobSize *= self.filter.copies |
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60 | |
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61 | # get last job information for this printer |
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62 | if not printer.LastJob.Exists : |
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63 | # The printer hasn't been used yet, from PyKota's point of view |
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64 | self.LastPageCounter = 0 |
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65 | else : |
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66 | # get last job size and page counter from Quota Storage |
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67 | # Last lifetime page counter before actual job is |
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68 | # last page counter + last job size |
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69 | self.LastPageCounter = int(printer.LastJob.PrinterPageCounter or 0) + int(printer.LastJob.JobSize or 0) |
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70 | |
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71 | def fakeBeginJob(self) : |
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72 | """Do nothing.""" |
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73 | pass |
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74 | |
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75 | def endJob(self, printer) : |
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76 | """Do nothing.""" |
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77 | pass |
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78 | |
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79 | def getJobSize(self, printer) : |
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80 | """Returns the actual job size.""" |
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81 | try : |
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82 | return self.JobSize |
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83 | except AttributeError : |
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84 | return 0 |
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85 | |
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86 | def computeJobSize(self) : |
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87 | """Must be overriden in children classes.""" |
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88 | raise RuntimeError, "AccounterBase.computeJobSize() must be overriden !" |
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89 | |
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90 | def openAccounter(kotafilter) : |
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91 | """Returns a connection handle to the appropriate accounter.""" |
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92 | (backend, args) = kotafilter.config.getAccounterBackend(kotafilter.printername) |
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93 | try : |
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94 | exec "from pykota.accounters import %s as accounterbackend" % backend.lower() |
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95 | except ImportError : |
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96 | raise PyKotaAccounterError, _("Unsupported accounter backend %s") % backend |
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97 | else : |
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98 | return accounterbackend.Accounter(kotafilter, args) |
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