Mercurial > libervia-backend

annotate libervia/backend/tools/common/async_process.py @ 4194:3dbaf179c50d

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core (launcher): new `wait_for_service` option: if `wait_for_service` is used in `[DEFAULT]`, the service at the specified host/port is waited for before starting the backend. This is useful in the situation where we need to be sure that something is started before running, e.g. in a container.
author Goffi <goffi@goffi.org>
date Wed, 13 Dec 2023 22:00:25 +0100
parents 730f542e4ad0
children 601e72332907
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1 #!/usr/bin/env python3
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2
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3
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4 # SAT: a jabber client
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5 # Copyright (C) 2009-2021 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 libervia.backend.core.i18n import _
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26 from libervia.backend.core import exceptions
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27 from libervia.backend.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 ''
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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 = b''.join(self.data)
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78 if (reason.value.exitCode == 0):
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79 log.debug(f'{self.command_name!r} command succeed')
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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)
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83 else:
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84 err_data = b''.join(self.err_data)
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85
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86 msg = (_("Can't complete {name} command (error code: {code}):\n"
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87 "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.decode(errors='replace'),
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91 stdout = "stdout: " + data.decode(errors='replace')
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92 if data else '',
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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 execute
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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)bytes): 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 args = list(args)
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118 d = defer.Deferred()
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119 prot = cls(d, stdin=stdin)
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120 if verbose:
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121 prot.log = True
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122 if cls.command is None:
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123 if not args:
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124 raise ValueError(
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125 "You must either specify cls.command or use a full path to command "
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126 "to execute as first argument")
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127 command = args.pop(0)
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128 if prot.name is None:
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129 name = os.path.splitext(os.path.basename(command))[0]
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130 prot.name = name
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131 else:
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132 command = cls.command
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133 cmd_args = [command] + args
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134 if "env" not in kwargs:
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135 # we pass parent environment by default
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136 # FIXME: `None` doesn't seem to work, despite what documentation says, to be
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137 # checked and reported upstream if confirmed.
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138 kwargs["env"] = os.environ
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139 reactor.spawnProcess(prot,
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140 command,
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141 cmd_args,
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142 **kwargs)
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143 return d
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144
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145
be5fffe34987 tools (common/async_process): fixed stderr handling + added global "run"
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146 run = CommandProtocol.run