1 | #! /usr/bin/env python |
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2 | # -*- coding: ISO-8859-15 -*- |
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3 | |
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4 | # CUPSPyKota accounting backend |
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5 | # |
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6 | # PyKota - Print Quotas for CUPS and LPRng |
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7 | # |
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8 | # (c) 2003-2004 Jerome Alet <alet@librelogiciel.com> |
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9 | # This program is free software; you can redistribute it and/or modify |
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10 | # it under the terms of the GNU General Public License as published by |
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11 | # the Free Software Foundation; either version 2 of the License, or |
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12 | # (at your option) any later version. |
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13 | # |
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14 | # This program is distributed in the hope that it will be useful, |
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15 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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16 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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17 | # GNU General Public License for more details. |
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18 | # |
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19 | # You should have received a copy of the GNU General Public License |
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20 | # along with this program; if not, write to the Free Software |
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21 | # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA. |
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22 | # |
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23 | # $Id$ |
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24 | # |
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25 | # $Log$ |
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26 | # Revision 1.60 2004/06/03 23:14:08 jalet |
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27 | # Now stores the job's size in bytes in the database. |
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28 | # Preliminary work on payments storage : database schemas are OK now, |
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29 | # but no code to store payments yet. |
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30 | # Removed schema picture, not relevant anymore. |
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31 | # |
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32 | # Revision 1.59 2004/06/03 22:12:53 jalet |
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33 | # Now denies empty jobs |
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34 | # |
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35 | # Revision 1.58 2004/06/03 21:50:33 jalet |
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36 | # Improved error logging. |
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37 | # crashrecipient directive added. |
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38 | # Now exports the job's size in bytes too. |
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39 | # |
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40 | # Revision 1.57 2004/06/02 22:18:07 jalet |
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41 | # I think the bug when cancelling jobs should be fixed right now |
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42 | # |
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43 | # Revision 1.56 2004/06/02 21:50:56 jalet |
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44 | # Moved the sigterm capturing elsewhere |
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45 | # |
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46 | # Revision 1.55 2004/06/02 14:25:07 jalet |
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47 | # Should correctly capture ALL errors now |
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48 | # |
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49 | # Revision 1.54 2004/05/26 16:44:48 jalet |
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50 | # Now logs something when client hostname can't be extracted |
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51 | # |
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52 | # Revision 1.53 2004/05/26 14:49:35 jalet |
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53 | # First try at saving the job-originating-hostname in the database |
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54 | # |
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55 | # Revision 1.52 2004/05/25 09:15:13 jalet |
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56 | # accounter.py : old code deleted |
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57 | # the rest : now exports PYKOTAPRECOMPUTEDJOBSIZE and PYKOTAPRECOMPUTEDJOBPRICE |
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58 | # |
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59 | # Revision 1.51 2004/05/25 08:31:16 jalet |
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60 | # Heavy CPU usage seems to be fixed at least ! |
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61 | # |
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62 | # Revision 1.50 2004/05/25 05:17:50 jalet |
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63 | # Now precomputes the job's size only if current printer's enforcement |
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64 | # is "STRICT" |
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65 | # |
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66 | # Revision 1.49 2004/05/24 22:45:48 jalet |
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67 | # New 'enforcement' directive added |
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68 | # Polling loop improvements |
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69 | # |
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70 | # Revision 1.48 2004/05/24 14:36:24 jalet |
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71 | # Revert to old polling loop. Will need optimisations |
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72 | # |
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73 | # Revision 1.47 2004/05/24 11:59:46 jalet |
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74 | # More robust (?) code |
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75 | # |
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76 | # Revision 1.46 2004/05/21 22:02:51 jalet |
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77 | # Preliminary work on pre-accounting |
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78 | # |
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79 | # Revision 1.45 2004/05/19 07:15:32 jalet |
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80 | # Could the 'misterious' bug in my loop be finally fixed ??? |
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81 | # |
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82 | # Revision 1.44 2004/05/18 14:48:47 jalet |
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83 | # Big code changes to completely remove the need for "requester" directives, |
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84 | # jsut use "hardware(... your previous requester directive's content ...)" |
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85 | # |
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86 | # Revision 1.43 2004/05/17 11:46:05 jalet |
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87 | # First try at cupspykota's main loop rewrite |
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88 | # |
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89 | # Revision 1.42 2004/05/10 11:22:28 jalet |
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90 | # Typo |
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91 | # |
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92 | # Revision 1.41 2004/05/10 10:07:30 jalet |
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93 | # Catches OSError while reading |
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94 | # |
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95 | # Revision 1.40 2004/05/10 09:29:48 jalet |
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96 | # Should be more robust if we receive a SIGTERM during an I/O operation |
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97 | # |
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98 | # Revision 1.39 2004/05/07 14:44:53 jalet |
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99 | # Fix for file handles unregistered twice from the polling object |
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100 | # |
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101 | # Revision 1.38 2004/04/09 22:24:46 jalet |
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102 | # Began work on correct handling of child processes when jobs are cancelled by |
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103 | # the user. Especially important when an external requester is running for a |
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104 | # long time. |
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105 | # |
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106 | # Revision 1.37 2004/03/18 19:11:25 jalet |
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107 | # Fix for raw jobs in cupspykota |
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108 | # |
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109 | # Revision 1.36 2004/03/18 14:03:18 jalet |
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110 | # Added fsync() calls |
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111 | # |
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112 | # Revision 1.35 2004/03/16 12:05:01 jalet |
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113 | # Small fix for new waitprinter.sh : when job was denied, would wait forever |
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114 | # for printer being in printing mode. |
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115 | # |
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116 | # Revision 1.34 2004/03/15 10:47:56 jalet |
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117 | # This time the traceback formatting should be correct ! |
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118 | # |
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119 | # Revision 1.33 2004/03/05 12:46:07 jalet |
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120 | # Improve tracebacks |
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121 | # |
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122 | # Revision 1.32 2004/03/05 12:31:35 jalet |
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123 | # Now should output full traceback when crashing |
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124 | # |
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125 | # Revision 1.31 2004/03/01 14:35:56 jalet |
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126 | # PYKOTAPHASE wasn't set soon enough at the start of the job |
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127 | # |
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128 | # Revision 1.30 2004/03/01 14:34:15 jalet |
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129 | # PYKOTAPHASE wasn't set at the right time at the end of data transmission |
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130 | # to underlying layer (real backend) |
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131 | # |
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132 | # Revision 1.29 2004/03/01 11:23:25 jalet |
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133 | # Pre and Post hooks to external commands are available in the cupspykota |
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134 | # backend. Forthe pykota filter they will be implemented real soon now. |
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135 | # |
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136 | # Revision 1.28 2004/02/26 14:18:07 jalet |
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137 | # Should fix the remaining bugs wrt printers groups and users groups. |
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138 | # |
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139 | # Revision 1.27 2004/02/04 23:41:27 jalet |
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140 | # Should fix the incorrect "backend died abnormally" problem. |
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141 | # |
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142 | # Revision 1.26 2004/01/30 16:35:03 jalet |
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143 | # Fixes stupid software accounting bug in CUPS backend |
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144 | # |
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145 | # Revision 1.25 2004/01/16 17:51:46 jalet |
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146 | # Fuck Fuck Fuck !!! |
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147 | # |
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148 | # Revision 1.24 2004/01/14 15:52:01 jalet |
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149 | # Small fix for job cancelling code. |
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150 | # |
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151 | # Revision 1.23 2004/01/13 10:48:28 jalet |
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152 | # Small streams polling loop modification. |
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153 | # |
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154 | # Revision 1.22 2004/01/12 22:43:40 jalet |
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155 | # New formula to compute a job's price |
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156 | # |
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157 | # Revision 1.21 2004/01/12 18:17:36 jalet |
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158 | # Denied jobs weren't stored into the history anymore, this is now fixed. |
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159 | # |
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160 | # Revision 1.20 2004/01/11 23:22:42 jalet |
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161 | # Major code refactoring, it's way cleaner, and now allows automated addition |
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162 | # of printers on first print. |
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163 | # |
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164 | # Revision 1.19 2004/01/08 14:10:32 jalet |
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165 | # Copyright year changed. |
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166 | # |
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167 | # Revision 1.18 2004/01/07 16:16:32 jalet |
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168 | # Better debugging information |
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169 | # |
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170 | # Revision 1.17 2003/12/27 16:49:25 uid67467 |
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171 | # Should be ok now. |
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172 | # |
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173 | # Revision 1.17 2003/12/06 08:54:29 jalet |
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174 | # Code simplifications. |
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175 | # Added many debugging messages. |
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176 | # |
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177 | # Revision 1.16 2003/11/26 20:43:29 jalet |
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178 | # Inadvertantly introduced a bug, which is fixed. |
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179 | # |
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180 | # Revision 1.15 2003/11/26 19:17:35 jalet |
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181 | # Printing on a printer not present in the Quota Storage now results |
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182 | # in the job being stopped or cancelled depending on the system. |
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183 | # |
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184 | # Revision 1.14 2003/11/25 13:25:45 jalet |
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185 | # Boolean problem with old Python, replaced with 0 |
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186 | # |
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187 | # Revision 1.13 2003/11/23 19:01:35 jalet |
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188 | # Job price added to history |
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189 | # |
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190 | # Revision 1.12 2003/11/21 14:28:43 jalet |
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191 | # More complete job history. |
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192 | # |
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193 | # Revision 1.11 2003/11/19 23:19:35 jalet |
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194 | # Code refactoring work. |
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195 | # Explicit redirection to /dev/null has to be set in external policy now, just |
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196 | # like in external mailto. |
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197 | # |
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198 | # Revision 1.10 2003/11/18 17:54:24 jalet |
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199 | # SIGTERMs are now transmitted to original backends. |
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200 | # |
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201 | # Revision 1.9 2003/11/18 14:11:07 jalet |
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202 | # Small fix for bizarre urls |
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203 | # |
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204 | # Revision 1.8 2003/11/15 14:26:44 jalet |
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205 | # General improvements to the documentation. |
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206 | # Email address changed in sample configuration file, because |
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207 | # I receive low quota messages almost every day... |
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208 | # |
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209 | # Revision 1.7 2003/11/14 22:05:12 jalet |
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210 | # New CUPS backend fully functionnal. |
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211 | # Old CUPS configuration method is now officially deprecated. |
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212 | # |
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213 | # Revision 1.6 2003/11/14 20:13:11 jalet |
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214 | # We exit the loop too soon. |
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215 | # |
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216 | # Revision 1.5 2003/11/14 18:31:27 jalet |
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217 | # Not perfect, but seems to work with the poll() loop. |
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218 | # |
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219 | # Revision 1.4 2003/11/14 17:04:15 jalet |
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220 | # More (untested) work on the CUPS backend. |
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221 | # |
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222 | # Revision 1.3 2003/11/12 23:27:44 jalet |
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223 | # More work on new backend. This commit may be unstable. |
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224 | # |
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225 | # Revision 1.2 2003/11/12 09:33:34 jalet |
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226 | # New CUPS backend supports device enumeration |
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227 | # |
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228 | # Revision 1.1 2003/11/08 16:05:31 jalet |
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229 | # CUPS backend added for people to experiment. |
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230 | # |
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231 | # |
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232 | # |
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233 | |
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234 | import sys |
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235 | import os |
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236 | import fcntl |
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237 | import popen2 |
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238 | import cStringIO |
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239 | import shlex |
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240 | import select |
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241 | import signal |
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242 | import time |
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243 | |
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244 | from pykota.tool import PyKotaFilterOrBackend, PyKotaToolError |
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245 | from pykota.config import PyKotaConfigError |
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246 | from pykota.storage import PyKotaStorageError |
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247 | from pykota.accounter import PyKotaAccounterError |
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248 | |
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249 | class PyKotaPopen4(popen2.Popen4) : |
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250 | """Our own class to execute real backends. |
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251 | |
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252 | Their first argument is different from their path so using |
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253 | native popen2.Popen3 would not be feasible. |
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254 | """ |
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255 | def __init__(self, cmd, bufsize=-1, arg0=None) : |
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256 | self.arg0 = arg0 |
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257 | popen2.Popen4.__init__(self, cmd, bufsize) |
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258 | |
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259 | def _run_child(self, cmd): |
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260 | for i in range(3, 256): # TODO : MAXFD in original popen2 module |
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261 | try: |
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262 | os.close(i) |
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263 | except OSError: |
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264 | pass |
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265 | try: |
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266 | os.execvpe(cmd[0], [self.arg0 or cmd[0]] + cmd[1:], os.environ) |
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267 | finally: |
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268 | os._exit(1) |
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269 | |
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270 | class PyKotaBackend(PyKotaFilterOrBackend) : |
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271 | """A class for the pykota backend.""" |
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272 | def acceptJob(self) : |
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273 | """Returns the appropriate exit code to tell CUPS all is OK.""" |
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274 | return 0 |
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275 | |
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276 | def removeJob(self) : |
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277 | """Returns the appropriate exit code to let CUPS think all is OK. |
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278 | |
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279 | Returning 0 (success) prevents CUPS from stopping the print queue. |
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280 | """ |
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281 | return 0 |
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282 | |
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283 | def getPageLogLocation(self) : |
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284 | """Retrieves CUPS' page_log file location.""" |
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285 | location = None |
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286 | cupsroot = os.environ.get("CUPS_SERVERROOT", "/etc/cups") |
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287 | cupsdconf = os.path.join(cupsroot, "cupsd.conf") |
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288 | try : |
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289 | conffile = open(cupsdconf, "r") |
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290 | except IOError : |
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291 | self.logdebug("Unable to open %s" % cupsdconf) |
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292 | return # file doesn't exist or can't be read |
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293 | else : |
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294 | for line in conffile.readlines() : |
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295 | linecopy = line.strip().lower() |
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296 | if linecopy.startswith("pagelog ") : |
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297 | try : |
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298 | location = line.split()[1] |
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299 | except : |
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300 | pass # ignore errors, we take the last value in any case. |
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301 | conffile.close() |
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302 | return location |
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303 | |
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304 | def getJobOriginatingHostname(self, printername, username, jobid) : |
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305 | """Retrieves the job-originating-hostname from the CUPS page_log file if possible.""" |
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306 | pagelogpath = self.getPageLogLocation() or "/var/log/cups/page_log" |
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307 | try : |
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308 | pagelog = open(pagelogpath, "r") |
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309 | except IOError : |
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310 | self.logdebug("Unable to open %s" % pagelogpath) |
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311 | return # no page log or can't read it, originating hostname unknown yet |
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312 | else : |
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313 | # TODO : read backward so we could take first value seen |
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314 | # TODO : here we read forward so we must take the last value seen |
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315 | prefix = "%s %s %s" % (printername, username, jobid) |
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316 | matchingline = None |
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317 | while 1 : |
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318 | line = pagelog.readline() |
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319 | if not line : |
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320 | break |
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321 | else : |
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322 | line = line.strip() |
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323 | if line.startswith(prefix) : |
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324 | matchingline = line # no break, because we read forward |
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325 | pagelog.close() |
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326 | if matchingline is None : |
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327 | self.logdebug("No matching line found in page_log") |
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328 | return # correct line not found, job-originating-hostname unknown |
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329 | else : |
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330 | return matchingline.split()[-1] |
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331 | |
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332 | def doWork(self, policy, printer, user, userpquota) : |
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333 | """Most of the work is done here.""" |
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334 | # Two different values possible for policy here : |
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335 | # ALLOW means : Either printer, user or user print quota doesn't exist, |
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336 | # but the job should be allowed anyway. |
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337 | # OK means : Both printer, user and user print quota exist, job should |
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338 | # be allowed if current user is allowed to print on this printer |
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339 | if policy == "OK" : |
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340 | # exports user information with initial values |
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341 | self.exportUserInfo(userpquota) |
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342 | |
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343 | # tries to extract job-originating-hostname |
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344 | clienthost = self.getJobOriginatingHostname(printer.Name, user.Name, self.jobid) |
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345 | self.logdebug("Client Hostname : %s" % (clienthost or "Unknown")) |
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346 | os.environ["PYKOTAJOBORIGINATINGHOSTNAME"] = str(clienthost or "") |
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347 | |
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348 | # enters first phase |
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349 | os.environ["PYKOTAPHASE"] = "BEFORE" |
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350 | |
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351 | # do we want strict or laxist quota enforcement ? |
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352 | if self.config.getPrinterEnforcement(printer.Name) == "STRICT" : |
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353 | self.softwareJobSize = self.precomputeJobSize() |
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354 | self.softwareJobPrice = userpquota.computeJobPrice(self.softwareJobSize) |
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355 | self.logdebug("Precomputed job's size is %s pages, price is %s units" % (self.softwareJobSize, self.softwareJobPrice)) |
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356 | os.environ["PYKOTAPRECOMPUTEDJOBSIZE"] = str(self.softwareJobSize) |
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357 | os.environ["PYKOTAPRECOMPUTEDJOBPRICE"] = str(self.softwareJobPrice) |
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358 | |
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359 | # checks the user's quota |
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360 | action = self.warnUserPQuota(userpquota) |
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361 | |
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362 | # if no data to pass to real backend, probably a filter |
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363 | # higher in the chain failed because of a misconfiguration. |
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364 | # we deny the job in this case (nothing to print anyway) |
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365 | if not self.jobSizeBytes : |
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366 | self.logger.log_message(_("Job contains no data. Printing is denied."), "warn") |
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367 | action = "DENY" |
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368 | |
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369 | # exports some new environment variables |
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370 | os.environ["PYKOTAACTION"] = action |
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371 | |
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372 | # launches the pre hook |
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373 | self.prehook(userpquota) |
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374 | |
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375 | self.logdebug("Job accounting begins.") |
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376 | self.accounter.beginJob(userpquota) |
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377 | else : |
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378 | action = "ALLOW" |
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379 | os.environ["PYKOTAACTION"] = action |
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380 | |
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381 | # pass the job's data to the real backend |
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382 | if action in ["ALLOW", "WARN"] : |
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383 | if self.gotSigTerm : |
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384 | retcode = self.removeJob() |
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385 | else : |
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386 | retcode = self.handleData() |
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387 | else : |
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388 | retcode = self.removeJob() |
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389 | |
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390 | if policy == "OK" : |
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391 | # indicate phase change |
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392 | os.environ["PYKOTAPHASE"] = "AFTER" |
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393 | |
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394 | # stops accounting. |
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395 | self.accounter.endJob(userpquota) |
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396 | self.logdebug("Job accounting ends.") |
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397 | |
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398 | # retrieve the job size |
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399 | if action == "DENY" : |
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400 | jobsize = 0 |
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401 | self.logdebug("Job size forced to 0 because printing is denied.") |
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402 | else : |
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403 | jobsize = self.accounter.getJobSize() |
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404 | self.logdebug("Job size : %i" % jobsize) |
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405 | |
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406 | # update the quota for the current user on this printer |
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407 | self.logdebug("Updating user %s's quota on printer %s" % (user.Name, printer.Name)) |
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408 | jobprice = userpquota.increasePagesUsage(jobsize) |
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409 | |
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410 | # adds the current job to history |
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411 | printer.addJobToHistory(self.jobid, user, self.accounter.getLastPageCounter(), action, jobsize, jobprice, self.preserveinputfile, self.title, self.copies, self.options, clienthost, self.jobSizeBytes) |
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412 | self.logdebug("Job added to history.") |
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413 | |
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414 | # exports some new environment variables |
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415 | os.environ["PYKOTAJOBSIZE"] = str(jobsize) |
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416 | os.environ["PYKOTAJOBPRICE"] = str(jobprice) |
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417 | |
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418 | # then re-export user information with new value |
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419 | self.exportUserInfo(userpquota) |
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420 | |
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421 | # Launches the post hook |
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422 | self.posthook(userpquota) |
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423 | |
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424 | return retcode |
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425 | |
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426 | def unregisterFileNo(self, pollobj, fileno) : |
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427 | """Removes a file handle from the polling object.""" |
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428 | try : |
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429 | pollobj.unregister(fileno) |
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430 | except KeyError : |
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431 | self.logger.log_message(_("File number %s unregistered twice from polling object, ignored.") % fileno, "warn") |
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432 | except : |
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433 | self.logdebug("Error while unregistering file number %s from polling object." % fileno) |
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434 | else : |
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435 | self.logdebug("File number %s unregistered from polling object." % fileno) |
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436 | |
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437 | def formatFileEvent(self, fd, mask) : |
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438 | """Formats file debug info.""" |
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439 | maskval = [] |
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440 | if mask & select.POLLIN : |
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441 | maskval.append("POLLIN") |
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442 | if mask & select.POLLOUT : |
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443 | maskval.append("POLLOUT") |
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444 | if mask & select.POLLPRI : |
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445 | maskval.append("POLLPRI") |
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446 | if mask & select.POLLERR : |
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447 | maskval.append("POLLERR") |
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448 | if mask & select.POLLHUP : |
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449 | maskval.append("POLLHUP") |
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450 | if mask & select.POLLNVAL : |
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451 | maskval.append("POLLNVAL") |
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452 | return "%s (%s)" % (fd, " | ".join(maskval)) |
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453 | |
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454 | def handleData(self) : |
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455 | """Pass the job's data to the real backend.""" |
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456 | # Find the real backend pathname |
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457 | realbackend = os.path.join(os.path.split(sys.argv[0])[0], self.originalbackend) |
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458 | |
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459 | # And launch it |
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460 | self.logdebug("Starting real backend %s with args %s" % (realbackend, " ".join(['"%s"' % a for a in ([os.environ["DEVICE_URI"]] + sys.argv[1:])]))) |
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461 | subprocess = PyKotaPopen4([realbackend] + sys.argv[1:], bufsize=0, arg0=os.environ["DEVICE_URI"]) |
---|
462 | |
---|
463 | # Save file descriptors, we will need them later. |
---|
464 | stderrfno = sys.stderr.fileno() |
---|
465 | fromcfno = subprocess.fromchild.fileno() |
---|
466 | tocfno = subprocess.tochild.fileno() |
---|
467 | |
---|
468 | # We will have to be careful when dealing with I/O |
---|
469 | # So we use a poll object to know when to read or write |
---|
470 | pollster = select.poll() |
---|
471 | pollster.register(fromcfno, select.POLLIN | select.POLLPRI) |
---|
472 | pollster.register(stderrfno, select.POLLOUT) |
---|
473 | pollster.register(tocfno, select.POLLOUT) |
---|
474 | |
---|
475 | # Initialize our buffers |
---|
476 | indata = "" |
---|
477 | outdata = "" |
---|
478 | endinput = endoutput = 0 |
---|
479 | inputclosed = outputclosed = 0 |
---|
480 | |
---|
481 | if self.preserveinputfile is None : |
---|
482 | # this is not a real file, we read the job's data |
---|
483 | # from our temporary file which is a copy of stdin |
---|
484 | infno = self.jobdatastream.fileno() |
---|
485 | self.jobdatastream.seek(0) |
---|
486 | pollster.register(infno, select.POLLIN | select.POLLPRI) |
---|
487 | else : |
---|
488 | # job's data is in a file, no need to pass the data |
---|
489 | # to the real backend |
---|
490 | self.logdebug("Job's data is in %s" % self.preserveinputfile) |
---|
491 | infno = None |
---|
492 | endinput = 1 |
---|
493 | |
---|
494 | self.logdebug("Entering streams polling loop...") |
---|
495 | MEGABYTE = 1024*1024 |
---|
496 | killed = 0 |
---|
497 | status = -1 |
---|
498 | while (status == -1) and (not killed) and not (inputclosed and outputclosed) : |
---|
499 | # First check if original backend is still alive |
---|
500 | status = subprocess.poll() |
---|
501 | |
---|
502 | # Now if we got SIGTERM, we have |
---|
503 | # to kill -TERM the original backend |
---|
504 | if self.gotSigTerm and not killed : |
---|
505 | try : |
---|
506 | os.kill(subprocess.pid, signal.SIGTERM) |
---|
507 | except OSError, msg : # ignore but logs if process was already killed. |
---|
508 | self.logdebug("Error while sending signal to pid %s : %s" % (subprocess.pid, msg)) |
---|
509 | else : |
---|
510 | self.logger.log_message(_("SIGTERM was sent to real backend %s (pid: %s)") % (realbackend, subprocess.pid), "info") |
---|
511 | killed = 1 |
---|
512 | |
---|
513 | # In any case, deal with any remaining I/O |
---|
514 | try : |
---|
515 | availablefds = pollster.poll(5000) |
---|
516 | except select.error, msg : |
---|
517 | self.logdebug("Interrupted poll : %s" % msg) |
---|
518 | availablefds = [] |
---|
519 | if not availablefds : |
---|
520 | self.logdebug("Nothing to do, sleeping a bit...") |
---|
521 | time.sleep(0.01) # give some time to the system |
---|
522 | else : |
---|
523 | for (fd, mask) in availablefds : |
---|
524 | # self.logdebug(self.formatFileEvent(fd, mask)) |
---|
525 | try : |
---|
526 | if mask & select.POLLOUT : |
---|
527 | # We can write |
---|
528 | if fd == tocfno : |
---|
529 | if indata : |
---|
530 | try : |
---|
531 | os.write(fd, indata) |
---|
532 | except (OSError, IOError), msg : |
---|
533 | self.logdebug("Error while writing to real backend's stdin %s : %s" % (fd, msg)) |
---|
534 | else : |
---|
535 | indata = "" |
---|
536 | else : |
---|
537 | self.logdebug("No data to send to real backend yet, sleeping a bit...") |
---|
538 | time.sleep(0.01) |
---|
539 | |
---|
540 | if endinput : |
---|
541 | self.unregisterFileNo(pollster, tocfno) |
---|
542 | self.logdebug("Closing real backend's stdin.") |
---|
543 | os.close(tocfno) |
---|
544 | inputclosed = 1 |
---|
545 | elif fd == stderrfno : |
---|
546 | if outdata : |
---|
547 | try : |
---|
548 | os.write(fd, outdata) |
---|
549 | except (OSError, IOError), msg : |
---|
550 | self.logdebug("Error while writing to CUPS back channel (stderr) %s : %s" % (fd, msg)) |
---|
551 | else : |
---|
552 | outdata = "" |
---|
553 | else : |
---|
554 | # self.logdebug("No data to send back to CUPS yet, sleeping a bit...") # Uncommenting this fills your logs |
---|
555 | time.sleep(0.01) # Give some time to the system, stderr is ALWAYS writeable it seems. |
---|
556 | |
---|
557 | if endoutput : |
---|
558 | self.unregisterFileNo(pollster, stderrfno) |
---|
559 | outputclosed = 1 |
---|
560 | else : |
---|
561 | self.logdebug("Unexpected : %s - Sleeping a bit..." % self.formatFileEvent(fd, mask)) |
---|
562 | time.sleep(0.01) |
---|
563 | |
---|
564 | if mask & (select.POLLIN | select.POLLPRI) : |
---|
565 | # We have something to read |
---|
566 | try : |
---|
567 | data = os.read(fd, MEGABYTE) |
---|
568 | except (IOError, OSError), msg : |
---|
569 | self.logdebug("Error while reading file %s : %s" % (fd, msg)) |
---|
570 | else : |
---|
571 | if fd == infno : |
---|
572 | if not data : # If yes, then no more input data |
---|
573 | self.unregisterFileNo(pollster, infno) |
---|
574 | self.logdebug("Input data ends.") |
---|
575 | endinput = 1 # this happens with real files. |
---|
576 | else : |
---|
577 | indata += data |
---|
578 | elif fd == fromcfno : |
---|
579 | if not data : |
---|
580 | self.logdebug("No back channel data to read from real backend yet, sleeping a bit...") |
---|
581 | time.sleep(0.01) |
---|
582 | else : |
---|
583 | outdata += data |
---|
584 | else : |
---|
585 | self.logdebug("Unexpected : %s - Sleeping a bit..." % self.formatFileEvent(fd, mask)) |
---|
586 | time.sleep(0.01) |
---|
587 | |
---|
588 | if mask & (select.POLLHUP | select.POLLERR) : |
---|
589 | # Treat POLLERR as an EOF. |
---|
590 | # Some standard I/O stream has no more datas |
---|
591 | self.unregisterFileNo(pollster, fd) |
---|
592 | if fd == infno : |
---|
593 | # Here we are in the case where the input file is stdin. |
---|
594 | # which has no more data to be read. |
---|
595 | self.logdebug("Input data ends.") |
---|
596 | endinput = 1 |
---|
597 | elif fd == fromcfno : |
---|
598 | # We are no more interested in this file descriptor |
---|
599 | self.logdebug("Closing real backend's stdout+stderr.") |
---|
600 | os.close(fromcfno) |
---|
601 | endoutput = 1 |
---|
602 | else : |
---|
603 | self.logdebug("Unexpected : %s - Sleeping a bit..." % self.formatFileEvent(fd, mask)) |
---|
604 | time.sleep(0.01) |
---|
605 | |
---|
606 | if mask & select.POLLNVAL : |
---|
607 | self.logdebug("File %s was closed. Unregistering from polling object." % fd) |
---|
608 | self.unregisterFileNo(pollster, fd) |
---|
609 | except IOError, msg : |
---|
610 | self.logdebug("Got an IOError : %s" % msg) # we got signalled during an I/O |
---|
611 | |
---|
612 | # We must close the real backend's input stream |
---|
613 | if killed and not inputclosed : |
---|
614 | self.logdebug("Forcing close of real backend's stdin.") |
---|
615 | os.close(tocfno) |
---|
616 | |
---|
617 | self.logdebug("Exiting streams polling loop...") |
---|
618 | |
---|
619 | # Check exit code of original CUPS backend. |
---|
620 | if status == -1 : |
---|
621 | # we exited the loop before the real backend exited |
---|
622 | # now we have to wait for it to finish and get its status |
---|
623 | self.logdebug("Waiting for real backend to exit...") |
---|
624 | try : |
---|
625 | status = subprocess.wait() |
---|
626 | except OSError : # already dead |
---|
627 | status = 0 |
---|
628 | if os.WIFEXITED(status) : |
---|
629 | retcode = os.WEXITSTATUS(status) |
---|
630 | elif not killed : |
---|
631 | self.logger.log_message(_("CUPS backend %s died abnormally.") % realbackend, "error") |
---|
632 | retcode = -1 |
---|
633 | else : |
---|
634 | retcode = self.removeJob() |
---|
635 | return retcode |
---|
636 | |
---|
637 | if __name__ == "__main__" : |
---|
638 | # This is a CUPS backend, we should act and die like a CUPS backend |
---|
639 | if len(sys.argv) == 1 : |
---|
640 | # we will execute each existing backend in device enumeration mode |
---|
641 | # and generate their PyKota accounting counterpart |
---|
642 | (directory, myname) = os.path.split(sys.argv[0]) |
---|
643 | for backend in [os.path.join(directory, b) for b in os.listdir(directory) if os.path.isfile(os.path.join(directory, b)) and (b != myname)] : |
---|
644 | answer = os.popen(backend, "r") |
---|
645 | try : |
---|
646 | devices = [line.strip() for line in answer.readlines()] |
---|
647 | except : |
---|
648 | devices = [] |
---|
649 | status = answer.close() |
---|
650 | if status is None : |
---|
651 | for d in devices : |
---|
652 | # each line is of the form : 'xxxx xxxx "xxxx xxx" "xxxx xxx"' |
---|
653 | # so we have to decompose it carefully |
---|
654 | fdevice = cStringIO.StringIO("%s" % d) |
---|
655 | tokenizer = shlex.shlex(fdevice) |
---|
656 | tokenizer.wordchars = tokenizer.wordchars + r".:,?!~/\_$*-+={}[]()#" |
---|
657 | arguments = [] |
---|
658 | while 1 : |
---|
659 | token = tokenizer.get_token() |
---|
660 | if token : |
---|
661 | arguments.append(token) |
---|
662 | else : |
---|
663 | break |
---|
664 | fdevice.close() |
---|
665 | try : |
---|
666 | (devicetype, device, name, fullname) = arguments |
---|
667 | except ValueError : |
---|
668 | pass # ignore this 'bizarre' device |
---|
669 | else : |
---|
670 | if name.startswith('"') and name.endswith('"') : |
---|
671 | name = name[1:-1] |
---|
672 | if fullname.startswith('"') and fullname.endswith('"') : |
---|
673 | fullname = fullname[1:-1] |
---|
674 | print '%s cupspykota:%s "PyKota+%s" "PyKota managed %s"' % (devicetype, device, name, fullname) |
---|
675 | retcode = 0 |
---|
676 | elif len(sys.argv) not in (6, 7) : |
---|
677 | sys.stderr.write("ERROR: %s job-id user title copies options [file]\n" % sys.argv[0]) |
---|
678 | retcode = 1 |
---|
679 | else : |
---|
680 | try : |
---|
681 | # Initializes the backend |
---|
682 | kotabackend = PyKotaBackend() |
---|
683 | retcode = kotabackend.mainWork() |
---|
684 | except : |
---|
685 | try : |
---|
686 | kotabackend.crashed("cupspykota backend failed") |
---|
687 | except : |
---|
688 | pass |
---|
689 | retcode = 1 |
---|
690 | |
---|
691 | try : |
---|
692 | kotabackend.storage.close() |
---|
693 | except (TypeError, NameError, AttributeError) : |
---|
694 | pass |
---|
695 | |
---|
696 | kotabackend.closeJobDataStream() |
---|
697 | |
---|
698 | sys.exit(retcode) |
---|