Mercurial > libervia-backend
annotate sat/bridge/bridge_constructor/constructors/dbus/dbus_core_template.py @ 4041:2594e1951cf7
core (bridge): `action_new` now use serialised dict for extra data.
author | Goffi <goffi@goffi.org> |
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date | Mon, 15 May 2023 16:20:45 +0200 |
parents | 524856bd7b19 |
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3028 | 1 #!/usr/bin/env python3 |
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3 # Libervia communication bridge |
3479 | 4 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org) |
267 | 5 |
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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 Affero 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. |
267 | 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 Affero General Public License for more details. |
267 | 15 |
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16 # You should have received a copy of the GNU Affero General Public License |
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17 # along with this program. If not, see <http://www.gnu.org/licenses/>. |
267 | 18 |
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19 from types import MethodType |
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20 from functools import partialmethod |
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21 from twisted.internet import defer, reactor |
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22 from sat.core.i18n import _ |
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23 from sat.core.log import getLogger |
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24 from sat.core.exceptions import BridgeInitError |
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25 from sat.tools import config |
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26 from txdbus import client, objects, error |
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27 from txdbus.interface import DBusInterface, Method, Signal |
267 | 28 |
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29 |
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30 log = getLogger(__name__) |
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31 |
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32 # Interface prefix |
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33 const_INT_PREFIX = config.config_get( |
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34 config.parse_main_conf(), |
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35 "", |
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36 "bridge_dbus_int_prefix", |
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37 "org.libervia.Libervia") |
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38 const_ERROR_PREFIX = const_INT_PREFIX + ".error" |
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39 const_OBJ_PATH = "/org/libervia/Libervia/bridge" |
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40 const_CORE_SUFFIX = ".core" |
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41 const_PLUGIN_SUFFIX = ".plugin" |
267 | 42 |
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43 |
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44 class ParseError(Exception): |
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45 pass |
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46 |
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47 |
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48 class DBusException(Exception): |
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49 pass |
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50 |
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51 |
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52 class MethodNotRegistered(DBusException): |
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53 dbusErrorName = const_ERROR_PREFIX + ".MethodNotRegistered" |
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54 |
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55 |
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56 class GenericException(DBusException): |
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57 def __init__(self, twisted_error): |
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58 """ |
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59 |
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60 @param twisted_error (Failure): instance of twisted Failure |
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61 error message is used to store a repr of message and condition in a tuple, |
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62 so it can be evaluated by the frontend bridge. |
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63 """ |
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64 try: |
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65 # twisted_error.value is a class |
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66 class_ = twisted_error.value().__class__ |
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67 except TypeError: |
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68 # twisted_error.value is an instance |
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69 class_ = twisted_error.value.__class__ |
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70 data = twisted_error.getErrorMessage() |
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71 try: |
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72 data = (data, twisted_error.value.condition) |
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73 except AttributeError: |
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74 data = (data,) |
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75 else: |
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76 data = (str(twisted_error),) |
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77 self.dbusErrorName = ".".join( |
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78 (const_ERROR_PREFIX, class_.__module__, class_.__name__) |
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79 ) |
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80 super(GenericException, self).__init__(repr(data)) |
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81 |
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82 @classmethod |
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83 def create_and_raise(cls, exc): |
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84 raise cls(exc) |
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85 |
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86 |
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87 class DBusObject(objects.DBusObject): |
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88 |
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89 core_iface = DBusInterface( |
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90 const_INT_PREFIX + const_CORE_SUFFIX, |
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91 ##METHODS_DECLARATIONS_PART## |
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92 ##SIGNALS_DECLARATIONS_PART## |
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93 ) |
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94 plugin_iface = DBusInterface( |
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95 const_INT_PREFIX + const_PLUGIN_SUFFIX |
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96 ) |
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97 |
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98 dbusInterfaces = [core_iface, plugin_iface] |
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99 |
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100 def __init__(self, path): |
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101 super().__init__(path) |
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102 log.debug("Init DBusObject...") |
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103 self.cb = {} |
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2086 | 105 def register_method(self, name, cb): |
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106 self.cb[name] = cb |
267 | 107 |
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108 def _callback(self, name, *args, **kwargs): |
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109 """Call the callback if it exists, raise an exception else""" |
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110 try: |
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111 cb = self.cb[name] |
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112 except KeyError: |
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113 raise MethodNotRegistered |
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114 else: |
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115 d = defer.maybeDeferred(cb, *args, **kwargs) |
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116 d.addErrback(GenericException.create_and_raise) |
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117 return d |
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118 |
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119 ##METHODS_PART## |
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121 class bridge: |
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122 |
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123 def __init__(self): |
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124 log.info("Init DBus...") |
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125 self._obj = DBusObject(const_OBJ_PATH) |
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126 |
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127 async def post_init(self): |
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128 try: |
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129 conn = await client.connect(reactor) |
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130 except error.DBusException as e: |
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131 if e.errName == "org.freedesktop.DBus.Error.NotSupported": |
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132 log.error( |
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133 _( |
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134 "D-Bus is not launched, please see README to see instructions on " |
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135 "how to launch it" |
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136 ) |
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137 ) |
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138 raise BridgeInitError(str(e)) |
267 | 139 |
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140 conn.exportObject(self._obj) |
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141 await conn.requestBusName(const_INT_PREFIX) |
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142 |
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143 ##SIGNALS_PART## |
2086 | 144 def register_method(self, name, callback): |
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145 log.debug(f"registering DBus bridge method [{name}]") |
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146 self._obj.register_method(name, callback) |
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147 |
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148 def emit_signal(self, name, *args): |
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149 self._obj.emitSignal(name, *args) |
267 | 150 |
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151 def add_method( |
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152 self, name, int_suffix, in_sign, out_sign, method, async_=False, doc={} |
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153 ): |
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154 """Dynamically add a method to D-Bus bridge""" |
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155 # FIXME: doc parameter is kept only temporary, the time to remove it from calls |
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156 log.debug(f"Adding method {name!r} to D-Bus bridge") |
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157 self._obj.plugin_iface.addMethod( |
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158 Method(name, arguments=in_sign, returns=out_sign) |
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159 ) |
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160 # we have to create a method here instead of using partialmethod, because txdbus |
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161 # uses __func__ which doesn't work with partialmethod |
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162 def caller(self_, *args, **kwargs): |
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163 return self_._callback(name, *args, **kwargs) |
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164 setattr(self._obj, f"dbus_{name}", MethodType(caller, self._obj)) |
2086 | 165 self.register_method(name, method) |
267 | 166 |
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167 def add_signal(self, name, int_suffix, signature, doc={}): |
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168 """Dynamically add a signal to D-Bus bridge""" |
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169 log.debug(f"Adding signal {name!r} to D-Bus bridge") |
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170 self._obj.plugin_iface.addSignal(Signal(name, signature)) |
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171 setattr(bridge, name, partialmethod(bridge.emit_signal, name)) |