1 | # -*- coding: utf-8 -*- |
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2 | # |
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3 | # PyKota : Print Quotas for CUPS |
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4 | # |
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5 | # (c) 2003-2009 Jerome Alet <alet@librelogiciel.com> |
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6 | # This program is free software: you can redistribute it and/or modify |
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7 | # it under the terms of the GNU General Public License as published by |
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8 | # the Free Software Foundation, either version 3 of the License, or |
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9 | # (at your option) any later version. |
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10 | # |
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11 | # This program is distributed in the hope that it will be useful, |
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12 | # but WITHOUT ANY WARRANTY; without even the implied warranty of |
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13 | # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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14 | # GNU General Public License for more details. |
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15 | # |
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16 | # You should have received a copy of the GNU General Public License |
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17 | # along with this program. If not, see <http://www.gnu.org/licenses/>. |
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18 | # |
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19 | # $Id$ |
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20 | # |
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21 | # |
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22 | |
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23 | """This module handles software page counting for PyKota.""" |
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24 | |
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25 | import os |
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26 | import popen2 |
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27 | |
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28 | from pykota.errors import PyKotaAccounterError |
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29 | from pykota.accounter import AccounterBase |
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30 | |
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31 | class Accounter(AccounterBase) : |
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32 | def computeJobSize(self) : |
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33 | """Feeds an external command with our datas to let it compute the job size, and return its value.""" |
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34 | if (not self.isPreAccounter) and \ |
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35 | (self.filter.accounter.arguments == self.filter.preaccounter.arguments) : |
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36 | # if precomputing has been done and both accounter and preaccounter are |
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37 | # configured the same, no need to launch a second pass since we already |
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38 | # know the result. |
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39 | self.filter.logdebug("Precomputing pass told us that job is %s pages long." % self.filter.softwareJobSize) |
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40 | return self.filter.softwareJobSize # Optimize : already computed ! |
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41 | |
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42 | if self.arguments : |
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43 | self.filter.logdebug("Using external script %s to compute job's size." % self.arguments) |
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44 | return self.withExternalScript() |
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45 | else : |
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46 | self.filter.logdebug("Using internal parser to compute job's size.") |
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47 | return self.withInternalParser() |
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48 | |
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49 | def withInternalParser(self) : |
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50 | """Does software accounting through an external script.""" |
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51 | jobsize = 0 |
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52 | if self.filter.JobSizeBytes : |
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53 | try : |
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54 | from pkpgpdls import analyzer, pdlparser |
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55 | except ImportError : |
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56 | self.filter.printInfo("pkpgcounter is now distributed separately, please grab it from http://www.pykota.com/software/pkpgcounter", "error") |
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57 | self.filter.printInfo("Precomputed job size will be forced to 0 pages.", "error") |
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58 | else : |
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59 | try : |
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60 | parser = analyzer.PDLAnalyzer(self.filter.DataFile) |
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61 | jobsize = parser.getJobSize() |
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62 | except pdlparser.PDLParserError, msg : |
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63 | # Here we just log the failure, but |
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64 | # we finally ignore it and return 0 since this |
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65 | # computation is just an indication of what the |
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66 | # job's size MAY be. |
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67 | self.filter.printInfo(_("Unable to precompute the job's size with the generic PDL analyzer : %s") % msg, "warn") |
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68 | else : |
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69 | try : |
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70 | if self.filter.Ticket.FileName is not None : |
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71 | # when a filename is passed as an argument, the backend |
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72 | # must generate the correct number of copies. |
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73 | jobsize *= self.filter.Ticket.Copies |
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74 | except AttributeError : # When not run from the cupspykota backend |
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75 | pass |
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76 | return jobsize |
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77 | |
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78 | def withExternalScript(self) : |
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79 | """Does software accounting through an external script.""" |
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80 | self.filter.logdebug(_("Launching SOFTWARE(%s)...") % self.arguments) |
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81 | pagecounter = None |
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82 | child = os.popen(self.arguments, "r") |
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83 | try : |
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84 | answer = child.read() |
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85 | except (IOError, OSError), msg : |
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86 | msg = "%s : %s" % (self.arguments, msg) |
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87 | self.filter.printInfo(_("Unable to compute job size with accounter %s") % msg, "warn") |
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88 | else : |
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89 | lines = [l.strip() for l in answer.split("\n")] |
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90 | for i in range(len(lines)) : |
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91 | try : |
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92 | pagecounter = int(lines[i]) |
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93 | except (AttributeError, ValueError) : |
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94 | self.filter.logdebug(_("Line [%s] skipped in accounter's output. Trying again...") % lines[i]) |
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95 | else : |
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96 | break |
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97 | |
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98 | status = child.close() |
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99 | try : |
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100 | if os.WIFEXITED(status) : |
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101 | status = os.WEXITSTATUS(status) |
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102 | except TypeError : |
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103 | pass # None means no error occured. |
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104 | self.filter.logdebug(_("Software accounter %s exit code is %s") % (self.arguments, str(status))) |
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105 | |
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106 | if pagecounter is None : |
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107 | message = _("Unable to compute job size with accounter %s") % self.arguments |
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108 | if self.onerror == "CONTINUE" : |
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109 | self.filter.printInfo(message, "error") |
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110 | else : |
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111 | raise PyKotaAccounterError, message |
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112 | self.filter.logdebug("Software accounter %s said job is %s pages long." % (self.arguments, repr(pagecounter))) |
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113 | |
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114 | pagecounter = pagecounter or 0 |
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115 | try : |
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116 | if self.filter.Ticket.FileName is not None : |
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117 | # when a filename is passed as an argument, the backend |
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118 | # must generate the correct number of copies. |
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119 | pagecounter *= self.filter.Ticket.Copies |
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120 | except AttributeError : |
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121 | pass # when called from pykotme. TODO : clean this mess some day. |
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122 | |
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123 | return pagecounter |
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