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 1.26 2004/09/27 19:56:27 jalet |
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25 | # Added internal handling for PJL queries over port tcp/9100. Now waits |
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26 | # for printer being idle before asking, just like with SNMP. |
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27 | # |
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28 | # Revision 1.25 2004/09/27 09:21:37 jalet |
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29 | # Now includes printer's hostname in SNMP error messages |
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30 | # |
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31 | # Revision 1.24 2004/09/24 21:19:48 jalet |
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32 | # Did a pass of PyChecker |
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33 | # |
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34 | # Revision 1.23 2004/09/23 19:18:12 jalet |
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35 | # Now loops when the external hardware accounter fails, until it returns a correct value |
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36 | # |
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37 | # Revision 1.22 2004/09/22 19:48:01 jalet |
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38 | # Logs the looping message as debug instead of as info |
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39 | # |
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40 | # Revision 1.21 2004/09/22 19:27:41 jalet |
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41 | # Bad import statement |
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42 | # |
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43 | # Revision 1.20 2004/09/22 19:22:27 jalet |
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44 | # Just loop in case a network error occur |
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45 | # |
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46 | # Revision 1.19 2004/09/22 14:29:01 jalet |
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47 | # Fixed nasty typo |
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48 | # |
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49 | # Revision 1.18 2004/09/21 16:00:46 jalet |
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50 | # More informational messages |
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51 | # |
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52 | # Revision 1.17 2004/09/21 13:42:18 jalet |
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53 | # Typo |
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54 | # |
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55 | # Revision 1.16 2004/09/21 13:30:53 jalet |
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56 | # First try at full SNMP handling from the Python code. |
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57 | # |
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58 | # Revision 1.15 2004/09/14 11:38:59 jalet |
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59 | # Minor fix |
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60 | # |
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61 | # Revision 1.14 2004/09/14 06:53:53 jalet |
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62 | # Small test added |
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63 | # |
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64 | # Revision 1.13 2004/09/13 16:02:45 jalet |
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65 | # Added fix for incorrect job's size when hardware accounting fails |
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66 | # |
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67 | # Revision 1.12 2004/09/06 15:42:34 jalet |
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68 | # Fix missing import statement for the signal module |
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69 | # |
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70 | # Revision 1.11 2004/08/31 23:29:53 jalet |
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71 | # Introduction of the new 'onaccountererror' configuration directive. |
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72 | # Small fix for software accounter's return code which can't be None anymore. |
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73 | # Make software and hardware accounting code look similar : will be factorized |
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74 | # later. |
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75 | # |
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76 | # Revision 1.10 2004/08/27 22:49:04 jalet |
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77 | # No answer from subprocess now is really a fatal error. Waiting for some |
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78 | # time to make this configurable... |
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79 | # |
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80 | # Revision 1.9 2004/08/25 22:34:39 jalet |
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81 | # Now both software and hardware accounting raise an exception when no valid |
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82 | # result can be extracted from the subprocess' output. |
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83 | # Hardware accounting now reads subprocess' output until an integer is read |
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84 | # or data is exhausted : it now behaves just like software accounting in this |
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85 | # aspect. |
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86 | # |
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87 | # Revision 1.8 2004/07/22 22:41:48 jalet |
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88 | # Hardware accounting for LPRng should be OK now. UNTESTED. |
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89 | # |
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90 | # Revision 1.7 2004/07/16 12:22:47 jalet |
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91 | # LPRng support early version |
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92 | # |
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93 | # Revision 1.6 2004/07/01 19:56:42 jalet |
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94 | # Better dispatching of error messages |
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95 | # |
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96 | # Revision 1.5 2004/06/10 22:42:06 jalet |
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97 | # Better messages in logs |
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98 | # |
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99 | # Revision 1.4 2004/05/24 22:45:49 jalet |
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100 | # New 'enforcement' directive added |
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101 | # Polling loop improvements |
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102 | # |
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103 | # Revision 1.3 2004/05/24 14:36:40 jalet |
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104 | # Revert to old polling loop. Will need optimisations |
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105 | # |
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106 | # Revision 1.2 2004/05/18 14:49:22 jalet |
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107 | # Big code changes to completely remove the need for "requester" directives, |
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108 | # jsut use "hardware(... your previous requester directive's content ...)" |
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109 | # |
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110 | # Revision 1.1 2004/05/13 13:59:30 jalet |
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111 | # Code simplifications |
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112 | # |
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113 | # |
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114 | # |
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115 | |
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116 | import os |
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117 | import socket |
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118 | import time |
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119 | import signal |
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120 | import popen2 |
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121 | |
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122 | from pykota.accounter import AccounterBase, PyKotaAccounterError |
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123 | |
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124 | try : |
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125 | from pysnmp.mapping.udp.error import SnmpOverUdpError |
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126 | from pysnmp.mapping.udp.role import Manager |
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127 | from pysnmp.proto.api import alpha |
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128 | except ImportError : |
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129 | hasSNMP = 0 |
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130 | else : |
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131 | hasSNMP = 1 |
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132 | SNMPDELAY = 2.0 # 2 Seconds |
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133 | STABILIZATIONDELAY = 3 # We must read three times the same value to consider it to be stable |
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134 | pageCounterOID = ".1.3.6.1.2.1.43.10.2.1.4.1.1" |
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135 | hrPrinterStatusOID = ".1.3.6.1.2.1.25.3.5.1.1.1" |
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136 | printerStatusValues = { 1 : 'other', |
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137 | 2 : 'unknown', |
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138 | 3 : 'idle', |
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139 | 4 : 'printing', |
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140 | 5 : 'warmup', |
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141 | } |
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142 | |
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143 | class SNMPAccounter : |
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144 | """A class for SNMP print accounting.""" |
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145 | def __init__(self, parent, printerhostname) : |
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146 | self.parent = parent |
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147 | self.printerHostname = printerhostname |
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148 | self.printerInternalPageCounter = self.printerStatus = None |
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149 | |
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150 | def retrieveSNMPValues(self) : |
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151 | """Retrieves a printer's internal page counter and status via SNMP.""" |
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152 | ver = alpha.protoVersions[alpha.protoVersionId1] |
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153 | req = ver.Message() |
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154 | req.apiAlphaSetCommunity('public') |
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155 | req.apiAlphaSetPdu(ver.GetRequestPdu()) |
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156 | req.apiAlphaGetPdu().apiAlphaSetVarBindList((pageCounterOID, ver.Null()), (hrPrinterStatusOID, ver.Null())) |
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157 | tsp = Manager() |
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158 | try : |
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159 | tsp.sendAndReceive(req.berEncode(), (self.printerHostname, 161), (self.handleAnswer, req)) |
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160 | except SnmpOverUdpError, msg : |
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161 | self.parent.filter.printInfo(_("Network error while doing SNMP queries on printer %s : %s") % (self.printerHostname, msg), "warn") |
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162 | tsp.close() |
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163 | |
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164 | def handleAnswer(self, wholeMsg, notusedhere, req): |
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165 | """Decodes and handles the SNMP answer.""" |
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166 | ver = alpha.protoVersions[alpha.protoVersionId1] |
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167 | rsp = ver.Message() |
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168 | rsp.berDecode(wholeMsg) |
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169 | if req.apiAlphaMatch(rsp): |
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170 | errorStatus = rsp.apiAlphaGetPdu().apiAlphaGetErrorStatus() |
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171 | if errorStatus: |
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172 | self.parent.filter.printInfo(_("Problem encountered while doing SNMP queries on printer %s : %s") % (self.printerHostname, errorStatus), "warn") |
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173 | else: |
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174 | self.values = [] |
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175 | for varBind in rsp.apiAlphaGetPdu().apiAlphaGetVarBindList(): |
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176 | self.values.append(varBind.apiAlphaGetOidVal()[1].rawAsn1Value) |
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177 | try : |
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178 | # keep maximum value seen for printer's internal page counter |
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179 | self.printerInternalPageCounter = max(self.printerInternalPageCounter, self.values[0]) |
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180 | self.printerStatus = self.values[1] |
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181 | except IndexError : |
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182 | pass |
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183 | else : |
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184 | return 1 |
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185 | |
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186 | def waitPrinting(self) : |
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187 | """Waits for printer status being 'printing'.""" |
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188 | while 1: |
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189 | self.retrieveSNMPValues() |
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190 | statusAsString = printerStatusValues.get(self.printerStatus) |
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191 | if statusAsString in ('idle', 'printing') : |
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192 | break |
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193 | # In reality, and if I'm not mistaken, we will NEVER get there. |
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194 | self.parent.filter.logdebug(_("Waiting for printer %s to be idle or printing...") % self.parent.filter.printername) |
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195 | time.sleep(SNMPDELAY) |
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196 | |
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197 | def waitIdle(self) : |
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198 | """Waits for printer status being 'idle'.""" |
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199 | idle_num = idle_flag = 0 |
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200 | while 1 : |
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201 | self.retrieveSNMPValues() |
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202 | statusAsString = printerStatusValues.get(self.printerStatus) |
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203 | idle_flag = 0 |
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204 | if statusAsString in ('idle',) : |
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205 | idle_flag = 1 |
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206 | if idle_flag : |
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207 | idle_num += 1 |
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208 | if idle_num > STABILIZATIONDELAY : |
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209 | # printer status is stable, we can exit |
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210 | break |
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211 | else : |
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212 | idle_num = 0 |
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213 | self.parent.filter.logdebug(_("Waiting for printer %s's idle status to stabilize...") % self.parent.filter.printername) |
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214 | time.sleep(SNMPDELAY) |
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215 | |
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216 | pjlMessage = "\033%-12345X@PJL USTATUSOFF\r\n@PJL USTATUS DEVICE=ON\r\n@PJL INFO STATUS\r\n@PJL INFO PAGECOUNT\r\n\033%-12345X" |
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217 | pjlStatusValues = { |
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218 | "10000" : "Powersave Mode", |
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219 | "10001" : "Ready Online", |
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220 | "10002" : "Ready Offline", |
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221 | "10003" : "Warming Up", |
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222 | "10004" : "Self Test", |
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223 | "10005" : "Reset", |
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224 | "10023" : "Printing", |
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225 | } |
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226 | class PJLAccounter : |
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227 | """A class for PJL print accounting.""" |
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228 | def __init__(self, parent, printerhostname) : |
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229 | self.parent = parent |
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230 | self.printerHostname = printerhostname |
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231 | self.printerInternalPageCounter = self.printerStatus = None |
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232 | self.printerInternalPageCounter = self.printerStatus = None |
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233 | self.timedout = 0 |
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234 | |
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235 | def alarmHandler(self, signum, frame) : |
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236 | """Query has timedout, handle this.""" |
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237 | self.timedout = 1 |
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238 | raise IOError, "Waiting for PJL answer timed out. Please try again later." |
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239 | |
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240 | def retrievePJLValues(self) : |
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241 | """Retrieves a printer's internal page counter and status via PJL.""" |
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242 | port = 9100 |
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243 | sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) |
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244 | try : |
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245 | sock.connect((self.printerHostname, port)) |
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246 | except socket.error, msg : |
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247 | self.parent.filter.printInfo(_("Problem during connection to %s:%s : %s") % (self.printerHostname, port, msg), "warn") |
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248 | else : |
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249 | try : |
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250 | sock.send(pjlMessage) |
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251 | except socket.error, msg : |
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252 | self.parent.filter.printInfo(_("Problem while sending PJL query to %s:%s : %s") % (self.printerHostname, port, msg), "warn") |
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253 | else : |
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254 | actualpagecount = self.printerStatus = None |
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255 | self.timedout = 0 |
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256 | while (self.timedout = 0) or (actualpagecount is None) or (self.printerStatus is None) : |
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257 | signal.signal(signal.SIGALRM, self.alarmHandler) |
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258 | signal.alarm(5) |
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259 | try : |
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260 | answer = sock.recv(1024) |
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261 | except IOError, msg : |
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262 | break # our alarm handler was launched, probably |
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263 | else : |
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264 | readnext = 0 |
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265 | for line in [l.strip() for l in answer.split()] : |
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266 | if line.startswith("CODE=") : |
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267 | self.printerStatus = line.split("=")[1] |
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268 | elif line.startswith("PAGECOUNT") : |
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269 | readnext = 1 # page counter is on next line |
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270 | elif readnext : |
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271 | actualpagecount = int(line.strip()) |
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272 | readnext = 0 |
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273 | signal.alarm(0) |
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274 | self.printerInternalPageCounter = max(actualpagecount, self.printerInternalPageCounter) |
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275 | sock.close() |
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276 | |
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277 | def waitPrinting(self) : |
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278 | """Waits for printer status being 'printing'.""" |
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279 | while 1: |
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280 | self.retrievePJLValues() |
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281 | if self.printerStatus in ('10000', '10001', '10023') : |
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282 | break |
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283 | # In reality, and if I'm not mistaken, we will NEVER get there. |
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284 | self.parent.filter.logdebug(_("Waiting for printer %s to be idle or printing...") % self.parent.filter.printername) |
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285 | time.sleep(ITERATIONDELAY) |
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286 | |
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287 | def waitIdle(self) : |
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288 | """Waits for printer status being 'idle'.""" |
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289 | idle_num = idle_flag = 0 |
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290 | while 1 : |
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291 | self.retrievePJLValues() |
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292 | idle_flag = 0 |
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293 | if self.printerStatus in ('10000', '10001',) : |
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294 | idle_flag = 1 |
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295 | if idle_flag : |
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296 | idle_num += 1 |
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297 | if idle_num > STABILIZATIONDELAY : |
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298 | # printer status is stable, we can exit |
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299 | break |
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300 | else : |
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301 | idle_num = 0 |
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302 | self.parent.filter.logdebug(_("Waiting for printer %s's idle status to stabilize...") % self.parent.filter.printername) |
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303 | time.sleep(ITERATIONDELAY) |
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304 | |
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305 | class Accounter(AccounterBase) : |
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306 | def __init__(self, kotabackend, arguments) : |
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307 | """Initializes querying accounter.""" |
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308 | AccounterBase.__init__(self, kotabackend, arguments) |
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309 | self.isSoftware = 0 |
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310 | |
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311 | def getPrinterInternalPageCounter(self) : |
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312 | """Returns the printer's internal page counter.""" |
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313 | self.filter.logdebug("Reading printer %s's internal page counter..." % self.filter.printername) |
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314 | counter = self.askPrinterPageCounter(self.filter.printerhostname) |
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315 | self.filter.logdebug("Printer %s's internal page counter value is : %s" % (self.filter.printername, str(counter))) |
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316 | return counter |
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317 | |
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318 | def beginJob(self, printer) : |
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319 | """Saves printer internal page counter at start of job.""" |
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320 | # save page counter before job |
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321 | self.LastPageCounter = self.getPrinterInternalPageCounter() |
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322 | self.fakeBeginJob() |
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323 | |
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324 | def fakeBeginJob(self) : |
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325 | """Fakes a begining of a job.""" |
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326 | self.counterbefore = self.getLastPageCounter() |
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327 | |
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328 | def endJob(self, printer) : |
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329 | """Saves printer internal page counter at end of job.""" |
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330 | # save page counter after job |
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331 | self.LastPageCounter = self.counterafter = self.getPrinterInternalPageCounter() |
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332 | |
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333 | def getJobSize(self, printer) : |
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334 | """Returns the actual job size.""" |
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335 | if (not self.counterbefore) or (not self.counterafter) : |
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336 | # there was a problem retrieving page counter |
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337 | self.filter.printInfo(_("A problem occured while reading printer %s's internal page counter.") % printer.Name, "warn") |
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338 | if printer.LastJob.Exists : |
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339 | # if there's a previous job, use the last value from database |
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340 | self.filter.printInfo(_("Retrieving printer %s's page counter from database instead.") % printer.Name, "warn") |
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341 | if not self.counterbefore : |
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342 | self.counterbefore = printer.LastJob.PrinterPageCounter or 0 |
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343 | if not self.counterafter : |
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344 | self.counterafter = printer.LastJob.PrinterPageCounter or 0 |
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345 | before = min(self.counterbefore, self.counterafter) |
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346 | after = max(self.counterbefore, self.counterafter) |
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347 | self.counterbefore = before |
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348 | self.counterafter = after |
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349 | if (not self.counterbefore) or (not self.counterafter) or (self.counterbefore == self.counterafter) : |
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350 | self.filter.printInfo(_("Couldn't retrieve printer %s's internal page counter either before or after printing.") % printer.Name, "warn") |
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351 | self.filter.printInfo(_("Job's size forced to 1 page for printer %s.") % printer.Name, "warn") |
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352 | self.counterbefore = 0 |
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353 | self.counterafter = 1 |
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354 | else : |
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355 | self.filter.printInfo(_("No previous job in database for printer %s.") % printer.Name, "warn") |
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356 | self.filter.printInfo(_("Job's size forced to 1 page for printer %s.") % printer.Name, "warn") |
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357 | self.counterbefore = 0 |
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358 | self.counterafter = 1 |
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359 | |
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360 | jobsize = (self.counterafter - self.counterbefore) |
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361 | if jobsize < 0 : |
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362 | # Try to take care of HP printers |
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363 | # Their internal page counter is saved to NVRAM |
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364 | # only every 10 pages. If the printer was switched |
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365 | # off then back on during the job, and that the |
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366 | # counters difference is negative, we know |
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367 | # the formula (we can't know if more than eleven |
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368 | # pages were printed though) : |
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369 | if jobsize > -10 : |
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370 | jobsize += 10 |
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371 | else : |
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372 | # here we may have got a printer being replaced |
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373 | # DURING the job. This is HIGHLY improbable ! |
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374 | self.filter.printInfo(_("Inconsistent values for printer %s's internal page counter.") % printer.Name, "warn") |
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375 | self.filter.printInfo(_("Job's size forced to 1 page for printer %s.") % printer.Name, "warn") |
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376 | jobsize = 1 |
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377 | return jobsize |
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378 | |
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379 | def askPrinterPageCounter(self, printer) : |
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380 | """Returns the page counter from the printer via an external command. |
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381 | |
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382 | The external command must report the life time page number of the printer on stdout. |
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383 | """ |
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384 | commandline = self.arguments.strip() % locals() |
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385 | cmdlower = commandline.lower() |
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386 | if cmdlower == "snmp" : |
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387 | if hasSNMP : |
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388 | return self.askWithSNMP(printer) |
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389 | else : |
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390 | raise PyKotaAccounterError, _("Internal SNMP accounting asked, but Python-SNMP is not available. Please download it from http://pysnmp.sourceforge.net") |
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391 | elif cmdlower == "pjl" : |
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392 | return self.askWithPJL(printer) |
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393 | |
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394 | if printer is None : |
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395 | raise PyKotaAccounterError, _("Unknown printer address in HARDWARE(%s) for printer %s") % (commandline, self.filter.printername) |
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396 | while 1 : |
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397 | self.filter.printInfo(_("Launching HARDWARE(%s)...") % commandline) |
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398 | pagecounter = None |
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399 | child = popen2.Popen4(commandline) |
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400 | try : |
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401 | answer = child.fromchild.read() |
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402 | except IOError : |
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403 | # we were interrupted by a signal, certainely a SIGTERM |
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404 | # caused by the user cancelling the current job |
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405 | try : |
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406 | os.kill(child.pid, signal.SIGTERM) |
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407 | except : |
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408 | pass # already killed ? |
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409 | self.filter.printInfo(_("SIGTERM was sent to hardware accounter %s (pid: %s)") % (commandline, child.pid)) |
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410 | else : |
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411 | lines = [l.strip() for l in answer.split("\n")] |
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412 | for i in range(len(lines)) : |
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413 | try : |
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414 | pagecounter = int(lines[i]) |
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415 | except (AttributeError, ValueError) : |
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416 | self.filter.printInfo(_("Line [%s] skipped in accounter's output. Trying again...") % lines[i]) |
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417 | else : |
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418 | break |
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419 | child.fromchild.close() |
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420 | child.tochild.close() |
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421 | try : |
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422 | status = child.wait() |
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423 | except OSError, msg : |
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424 | self.filter.logdebug("Error while waiting for hardware accounter pid %s : %s" % (child.pid, msg)) |
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425 | else : |
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426 | if os.WIFEXITED(status) : |
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427 | status = os.WEXITSTATUS(status) |
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428 | self.filter.printInfo(_("Hardware accounter %s exit code is %s") % (self.arguments, str(status))) |
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429 | |
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430 | if pagecounter is None : |
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431 | message = _("Unable to query printer %s via HARDWARE(%s)") % (printer, commandline) |
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432 | if self.onerror == "CONTINUE" : |
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433 | self.filter.printInfo(message, "error") |
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434 | else : |
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435 | raise PyKotaAccounterError, message |
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436 | else : |
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437 | return pagecounter |
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438 | |
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439 | def askWithSNMP(self, printer) : |
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440 | """Returns the page counter from the printer via internal SNMP handling.""" |
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441 | acc = SNMPAccounter(self, printer) |
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442 | try : |
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443 | if (os.environ.get("PYKOTASTATUS") != "CANCELLED") and \ |
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444 | (os.environ.get("PYKOTAACTION") != "DENY") and \ |
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445 | (os.environ.get("PYKOTAPHASE") == "AFTER") : |
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446 | acc.waitPrinting() |
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447 | acc.waitIdle() |
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448 | except : |
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449 | if acc.printerInternalPageCounter is None : |
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450 | raise |
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451 | else : |
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452 | self.filter.printInfo(_("SNMP querying stage interrupted. Using latest value seen for internal page counter (%s) on printer %s.") % (acc.printerInternalPageCounter, self.filter.printername), "warn") |
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453 | return acc.printerInternalPageCounter |
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454 | |
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455 | def askWithPJL(self, printer) : |
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456 | """Returns the page counter from the printer via internal PJL handling.""" |
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457 | acc = PJLAccounter(self, printer) |
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458 | try : |
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459 | if (os.environ.get("PYKOTASTATUS") != "CANCELLED") and \ |
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460 | (os.environ.get("PYKOTAACTION") != "DENY") and \ |
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461 | (os.environ.get("PYKOTAPHASE") == "AFTER") : |
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462 | acc.waitPrinting() |
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463 | acc.waitIdle() |
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464 | except : |
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465 | if acc.printerInternalPageCounter is None : |
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466 | raise |
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467 | else : |
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468 | self.filter.printInfo(_("PJL querying stage interrupted. Using latest value seen for internal page counter (%s) on printer %s.") % (acc.printerInternalPageCounter, self.filter.printername), "warn") |
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469 | return acc.printerInternalPageCounter |
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