Mercurial > libervia-backend

annotate sat/tools/common/async_process.py @ 2888:e3803ae89fbc

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quick_frontend (widgets): fixed crash on getWidgets when target doesn't correspond to any widget
author Goffi <goffi@goffi.org>
date Sun, 07 Apr 2019 15:04:28 +0200
parents 181735d1b062
children ab2696e34d29
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
2793
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1 #!/usr/bin/env python2
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2 # -*- coding: utf-8 -*-
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3
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4 # SAT: a jabber client
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5 # Copyright (C) 2009-2019 Jérôme Poisson (goffi@goffi.org)
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6
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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 Affero General Public License as published by
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9 # the Free Software Foundation, either version 3 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 Affero 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 Affero General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20 """tools to launch process in a async way (using Twisted)"""
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21
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22 import os.path
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23 from twisted.internet import defer, reactor, protocol
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24 from twisted.python.failure import Failure
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25 from sat.core.i18n import _
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26 from sat.core import exceptions
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27 from sat.core.log import getLogger
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28 log = getLogger(__name__)
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29
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30
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31 class CommandProtocol(protocol.ProcessProtocol):
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32 """handle an external command"""
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33 # name of the command (unicode)
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34 name = None
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35 # full path to the command (bytes)
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36 command = None
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37 # True to activate logging of command outputs (bool)
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38 log = False
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39
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40 def __init__(self, deferred, stdin=None):
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41 """
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42 @param deferred(defer.Deferred): will be called when command is completed
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43 @param stdin(str, None): if not None, will be push to standard input
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44 """
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45 self._stdin = stdin
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46 self._deferred = deferred
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47 self.data = []
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48 self.err_data = []
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49
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50 @property
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51 def command_name(self):
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52 """returns command name or empty string if it can't be guessed"""
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53 if self.name is not None:
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54 return self.name
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55 elif self.command is not None:
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56 return os.path.splitext(os.path.basename(self.command))[0].decode('utf-8',
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57 'ignore')
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58 else:
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59 return u''
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60
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61 def connectionMade(self):
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62 if self._stdin is not None:
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63 self.transport.write(self._stdin)
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64 self.transport.closeStdin()
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65
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66 def outReceived(self, data):
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67 if self.log:
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68 log.info(data.decode('utf-8', 'replace'))
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69 self.data.append(data)
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70
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71 def errReceived(self, data):
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72 if self.log:
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73 log.warning(data.decode('utf-8', 'replace'))
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74 self.err_data.append(data)
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75
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76 def processEnded(self, reason):
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77 data = ''.join(self.data)
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78 if (reason.value.exitCode == 0):
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79 log.debug(_(u'{name} command succeed').format(name=self.command_name))
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80 # we don't use "replace" on purpose, we want an exception if decoding
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81 # is not working properly
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82 self._deferred.callback(data.encode('utf-8'))
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83 else:
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84 err_data = u''.join(self.err_data)
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85
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86 msg = (_(u"Can't complete {name} command (error code: {code}):\n"
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87 u"stderr:\n{stderr}\n{stdout}\n")
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88 .format(name = self.command_name,
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89 code = reason.value.exitCode,
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90 stderr= err_data.encode('utf-8', 'replace'),
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91 stdout = "stdout: " + data.encode('utf-8', 'replace')
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92 if data else u'',
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93 ))
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94 self._deferred.errback(Failure(exceptions.CommandException(
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95 msg, data, err_data)))
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96
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97 @classmethod
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98 def run(cls, *args, **kwargs):
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99 """Create a new CommandProtocol and execute the given command.
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100
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101 @param *args(unicode): command arguments
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102 if cls.command is specified, it will be the path to the command to execture
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103 otherwise, first argument must be the path
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104 @param **kwargs: can be:
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105 - stdin(unicode, None): data to push to standard input
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106 - verbose(bool): if True stdout and stderr will be logged
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107 other keyword arguments will be used in reactor.spawnProcess
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108 @return ((D)): stdout in case of success
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109 @raise RuntimeError: command returned a non zero status
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110 stdin and stdout will be given as arguments
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111
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112 """
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113 stdin = kwargs.pop('stdin', None)
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114 if stdin is not None:
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115 stdin = stdin.encode('utf-8')
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116 verbose = kwargs.pop('verbose', False)
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117 if u'path' in kwargs:
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118 kwargs[u'path'] = kwargs[u'path'].encode('utf-8')
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119 args = [a.encode('utf-8') for a in args]
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120 kwargs = {k:v.encode('utf-8') for k,v in kwargs.items()}
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121 d = defer.Deferred()
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122 prot = cls(d, stdin=stdin)
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123 if verbose:
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124 prot.log = True
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125 if cls.command is None:
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126 if not args:
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127 raise ValueError(
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128 u"You must either specify cls.command or use a full path to command "
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129 u"to execute as first argument")
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130 command = args.pop(0)
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131 if prot.name is None:
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132 name = os.path.splitext(os.path.basename(command))[0]
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133 prot.name = name.encode(u'utf-8', u'ignore')
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134 else:
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135 command = cls.command
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136 cmd_args = [os.path.basename(command)] + args
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137 reactor.spawnProcess(prot,
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138 command,
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139 cmd_args,
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140 **kwargs)
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141 return d