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 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 1.7 2003/11/25 23:46:40 jalet |
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25 | # Don't try to verify if module name is valid, Python does this better than us. |
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26 | # |
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27 | # Revision 1.6 2003/11/12 23:28:55 jalet |
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28 | # More work on new backend. This commit may be unstable. |
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29 | # |
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30 | # Revision 1.5 2003/10/07 09:07:28 jalet |
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31 | # Character encoding added to please latest version of Python |
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32 | # |
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33 | # Revision 1.4 2003/07/14 14:14:59 jalet |
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34 | # Old template |
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35 | # |
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36 | # Revision 1.3 2003/04/30 19:53:58 jalet |
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37 | # 1.05 |
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38 | # |
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39 | # Revision 1.2 2003/04/30 13:36:40 jalet |
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40 | # Stupid accounting method was added. |
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41 | # |
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42 | # Revision 1.1 2003/04/29 18:37:54 jalet |
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43 | # Pluggable accounting methods (actually doesn't support external scripts) |
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44 | # |
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45 | # |
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46 | # |
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47 | |
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48 | import sys |
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49 | |
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50 | class PyKotaAccounterError(Exception): |
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51 | """An exception for Accounter related stuff.""" |
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52 | def __init__(self, message = ""): |
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53 | self.message = message |
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54 | Exception.__init__(self, message) |
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55 | def __repr__(self): |
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56 | return self.message |
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57 | __str__ = __repr__ |
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58 | |
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59 | class AccounterBase : |
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60 | """A class to account print usage by querying printers.""" |
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61 | def __init__(self, kotafilter, arguments) : |
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62 | """Sets instance vars depending on the current printer.""" |
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63 | self.filter = kotafilter |
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64 | self.arguments = arguments |
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65 | |
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66 | def getLastPageCounter(self) : |
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67 | """Returns last internal page counter value (possibly faked).""" |
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68 | try : |
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69 | return self.LastPageCounter |
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70 | except : |
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71 | return 0 |
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72 | |
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73 | def filterInput(self, inputfile) : |
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74 | """Transparent filter.""" |
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75 | mustclose = 0 |
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76 | if inputfile is not None : |
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77 | if hasattr(inputfile, "read") : |
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78 | infile = inputfile |
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79 | else : |
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80 | infile = open(inputfile, "rb") |
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81 | mustclose = 1 |
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82 | else : |
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83 | infile = sys.stdin |
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84 | data = infile.read(256*1024) |
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85 | while data : |
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86 | sys.stdout.write(data) |
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87 | data = infile.read(256*1024) |
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88 | if mustclose : |
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89 | infile.close() |
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90 | |
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91 | def doAccounting(self, printer, user) : |
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92 | """Does the real accounting.""" |
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93 | raise PyKotaAccounterError, "Accounter not implemented !" |
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94 | |
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95 | def openAccounter(kotafilter) : |
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96 | """Returns a connection handle to the appropriate accounter.""" |
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97 | (backend, args) = kotafilter.config.getAccounterBackend(kotafilter.printername) |
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98 | try : |
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99 | exec "from pykota.accounters import %s as accounterbackend" % backend.lower() |
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100 | except ImportError : |
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101 | raise PyKotaAccounterError, _("Unsupported accounter backend %s") % backend |
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102 | else : |
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103 | return getattr(accounterbackend, "Accounter")(kotafilter, args) |
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