root / pykota / trunk / pykota / accounter.py @ 2060

Revision 1873, 5.8 kB (checked in by jalet, 20 years ago)

Fixed bad indentation

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date Id Revision
Line 
1# PyKota
2# -*- coding: ISO-8859-15 -*-
3#
4# PyKota : Print Quotas for CUPS and LPRng
5#
6# (c) 2003-2004 Jerome Alet <alet@librelogiciel.com>
7# This program is free software; you can redistribute it and/or modify
8# it under the terms of the GNU General Public License as published by
9# the Free Software Foundation; either version 2 of the License, or
10# (at your option) any later version.
11#
12# This program is distributed in the hope that it will be useful,
13# but WITHOUT ANY WARRANTY; without even the implied warranty of
14# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15# GNU General Public License for more details.
16#
17# You should have received a copy of the GNU General Public License
18# along with this program; if not, write to the Free Software
19# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
20#
21# $Id$
22#
23# $Log$
24# Revision 1.21  2004/10/24 12:49:02  jalet
25# Fixed bad indentation
26#
27# Revision 1.20  2004/09/13 16:02:45  jalet
28# Added fix for incorrect job's size when hardware accounting fails
29#
30# Revision 1.19  2004/08/31 23:29:53  jalet
31# Introduction of the new 'onaccountererror' configuration directive.
32# Small fix for software accounter's return code which can't be None anymore.
33# Make software and hardware accounting code look similar : will be factorized
34# later.
35#
36# Revision 1.18  2004/07/22 22:41:48  jalet
37# Hardware accounting for LPRng should be OK now. UNTESTED.
38#
39# Revision 1.17  2004/07/16 12:22:47  jalet
40# LPRng support early version
41#
42# Revision 1.16  2004/05/25 09:15:15  jalet
43# accounter.py : old code deleted
44# the rest : now exports PYKOTAPRECOMPUTEDJOBSIZE and PYKOTAPRECOMPUTEDJOBPRICE
45#
46# Revision 1.15  2004/05/24 22:45:49  jalet
47# New 'enforcement' directive added
48# Polling loop improvements
49#
50# Revision 1.14  2004/05/18 14:49:19  jalet
51# Big code changes to completely remove the need for "requester" directives,
52# jsut use "hardware(... your previous requester directive's content ...)"
53#
54# Revision 1.13  2004/01/12 22:43:40  jalet
55# New formula to compute a job's price
56#
57# Revision 1.12  2004/01/11 23:43:31  jalet
58# Bug wrt number of copies with CUPS should be fixed.
59#
60# Revision 1.11  2004/01/11 23:22:42  jalet
61# Major code refactoring, it's way cleaner, and now allows automated addition
62# of printers on first print.
63#
64# Revision 1.10  2004/01/08 14:10:32  jalet
65# Copyright year changed.
66#
67# Revision 1.9  2003/12/27 16:49:25  uid67467
68# Should be ok now.
69#
70# Revision 1.7  2003/11/25 23:46:40  jalet
71# Don't try to verify if module name is valid, Python does this better than us.
72#
73# Revision 1.6  2003/11/12 23:28:55  jalet
74# More work on new backend. This commit may be unstable.
75#
76# Revision 1.5  2003/10/07 09:07:28  jalet
77# Character encoding added to please latest version of Python
78#
79# Revision 1.4  2003/07/14 14:14:59  jalet
80# Old template
81#
82# Revision 1.3  2003/04/30 19:53:58  jalet
83# 1.05
84#
85# Revision 1.2  2003/04/30 13:36:40  jalet
86# Stupid accounting method was added.
87#
88# Revision 1.1  2003/04/29 18:37:54  jalet
89# Pluggable accounting methods (actually doesn't support external scripts)
90#
91#
92#
93
94import sys
95
96class PyKotaAccounterError(Exception):
97    """An exception for Accounter related stuff."""
98    def __init__(self, message = ""):
99        self.message = message
100        Exception.__init__(self, message)
101    def __repr__(self):
102        return self.message
103    __str__ = __repr__
104   
105class AccounterBase :   
106    """A class to account print usage by querying printers."""
107    def __init__(self, kotafilter, arguments) :
108        """Sets instance vars depending on the current printer."""
109        self.filter = kotafilter
110        self.arguments = arguments
111        self.onerror = self.filter.config.getPrinterOnAccounterError(self.filter.printername)
112        self.isSoftware = 1 # by default software accounting
113       
114    def getLastPageCounter(self) :   
115        """Returns last internal page counter value (possibly faked)."""
116        try :
117            return self.LastPageCounter or 0
118        except :   
119            return 0
120           
121    def beginJob(self, printer) :   
122        """Saves the computed job size."""
123        # computes job's size
124        self.JobSize = self.computeJobSize()
125        if ((self.filter.printingsystem == "CUPS") \
126            and (self.filter.preserveinputfile is not None)) \
127            or (self.filter.printingsystem != "CUPS") :
128            self.JobSize *= self.filter.copies
129       
130        # get last job information for this printer
131        if not printer.LastJob.Exists :
132            # The printer hasn't been used yet, from PyKota's point of view
133            self.LastPageCounter = 0
134        else :   
135            # get last job size and page counter from Quota Storage
136            # Last lifetime page counter before actual job is
137            # last page counter + last job size
138            self.LastPageCounter = int(printer.LastJob.PrinterPageCounter or 0) + int(printer.LastJob.JobSize or 0)
139       
140    def fakeBeginJob(self) :   
141        """Do nothing."""
142        pass
143       
144    def endJob(self, printer) :   
145        """Do nothing."""
146        pass
147       
148    def getJobSize(self, printer) :   
149        """Returns the actual job size."""
150        try :
151            return self.JobSize
152        except AttributeError :   
153            return 0
154       
155    def computeJobSize(self) :   
156        """Must be overriden in children classes."""
157        raise RuntimeError, "AccounterBase.computeJobSize() must be overriden !"
158       
159def openAccounter(kotafilter) :
160    """Returns a connection handle to the appropriate accounter."""
161    (backend, args) = kotafilter.config.getAccounterBackend(kotafilter.printername)
162    try :
163        exec "from pykota.accounters import %s as accounterbackend" % backend.lower()
164    except ImportError :
165        raise PyKotaAccounterError, _("Unsupported accounter backend %s") % backend
166    else :   
167        return accounterbackend.Accounter(kotafilter, args)
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