Mercurial > libervia-backend

annotate libervia/backend/bridge/bridge_constructor/constructors/dbus/dbus_frontend_template.py @ 4270:0d7bb4df2343

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Reformatted code base using black.
author Goffi <goffi@goffi.org>
date Wed, 19 Jun 2024 18:44:57 +0200
parents 4b842c1fb686
children
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1 #!/usr/bin/env python3
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2
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3 # SàT communication bridge
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4 # Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)
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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.
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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 Affero 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 Affero 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 import asyncio
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20 import dbus
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21 import ast
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22 from libervia.backend.core.i18n import _
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23 from libervia.backend.tools import config
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24 from libervia.backend.core.log import getLogger
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25 from libervia.backend.core.exceptions import BridgeExceptionNoService, BridgeInitError
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26 from dbus.mainloop.glib import DBusGMainLoop
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27 from .bridge_frontend import BridgeException
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29
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30 DBusGMainLoop(set_as_default=True)
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31 log = getLogger(__name__)
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32
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34 # Interface prefix
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35 const_INT_PREFIX = config.config_get(
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36 config.parse_main_conf(), "", "bridge_dbus_int_prefix", "org.libervia.Libervia"
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37 )
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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"
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42 const_TIMEOUT = 120
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45 def dbus_to_bridge_exception(dbus_e):
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46 """Convert a DBusException to a BridgeException.
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47
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48 @param dbus_e (DBusException)
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49 @return: BridgeException
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50 """
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51 full_name = dbus_e.get_dbus_name()
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52 if full_name.startswith(const_ERROR_PREFIX):
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53 name = dbus_e.get_dbus_name()[len(const_ERROR_PREFIX) + 1 :]
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54 else:
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55 name = full_name
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56 # XXX: dbus_e.args doesn't contain the original DBusException args, but we
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57 # receive its serialized form in dbus_e.args[0]. From that we can rebuild
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58 # the original arguments list thanks to ast.literal_eval (secure eval).
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59 message = dbus_e.get_dbus_message() # similar to dbus_e.args[0]
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60 try:
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61 message, condition = ast.literal_eval(message)
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62 except (SyntaxError, ValueError, TypeError):
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63 condition = ""
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64 return BridgeException(name, message, condition)
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66
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67 class bridge:
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68
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69 def bridge_connect(self, callback, errback):
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70 try:
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71 self.sessions_bus = dbus.SessionBus()
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72 self.db_object = self.sessions_bus.get_object(
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73 const_INT_PREFIX, const_OBJ_PATH
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74 )
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75 self.db_core_iface = dbus.Interface(
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76 self.db_object, dbus_interface=const_INT_PREFIX + const_CORE_SUFFIX
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77 )
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78 self.db_plugin_iface = dbus.Interface(
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79 self.db_object, dbus_interface=const_INT_PREFIX + const_PLUGIN_SUFFIX
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80 )
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81 except dbus.exceptions.DBusException as e:
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82 if e._dbus_error_name in (
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83 "org.freedesktop.DBus.Error.ServiceUnknown",
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84 "org.freedesktop.DBus.Error.Spawn.ExecFailed",
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85 ):
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86 errback(BridgeExceptionNoService())
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87 elif e._dbus_error_name == "org.freedesktop.DBus.Error.NotSupported":
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88 log.error(
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89 _(
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90 "D-Bus is not launched, please see README to see instructions on how to launch it"
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91 )
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92 )
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93 errback(BridgeInitError)
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94 else:
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95 errback(e)
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96 else:
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97 callback()
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98 # props = self.db_core_iface.getProperties()
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99
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100 def register_signal(self, functionName, handler, iface="core"):
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101 if iface == "core":
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102 self.db_core_iface.connect_to_signal(functionName, handler)
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103 elif iface == "plugin":
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104 self.db_plugin_iface.connect_to_signal(functionName, handler)
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105 else:
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106 log.error(_("Unknown interface"))
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107
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108 def __getattribute__(self, name):
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109 """usual __getattribute__ if the method exists, else try to find a plugin method"""
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110 try:
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111 return object.__getattribute__(self, name)
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112 except AttributeError:
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113 # The attribute is not found, we try the plugin proxy to find the requested method
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114
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115 def get_plugin_method(*args, **kwargs):
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116 # We first check if we have an async call. We detect this in two ways:
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117 # - if we have the 'callback' and 'errback' keyword arguments
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118 # - or if the last two arguments are callable
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119
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120 async_ = False
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121 args = list(args)
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122
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123 if kwargs:
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124 if "callback" in kwargs:
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125 async_ = True
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126 _callback = kwargs.pop("callback")
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127 _errback = kwargs.pop(
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128 "errback", lambda failure: log.error(str(failure))
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129 )
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130 try:
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131 args.append(kwargs.pop("profile"))
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132 except KeyError:
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133 try:
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134 args.append(kwargs.pop("profile_key"))
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135 except KeyError:
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136 pass
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137 # at this point, kwargs should be empty
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138 if kwargs:
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139 log.warning(
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140 "unexpected keyword arguments, they will be ignored: {}".format(
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141 kwargs
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142 )
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143 )
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144 elif len(args) >= 2 and callable(args[-1]) and callable(args[-2]):
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145 async_ = True
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146 _errback = args.pop()
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147 _callback = args.pop()
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148
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149 method = getattr(self.db_plugin_iface, name)
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150
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151 if async_:
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152 kwargs["timeout"] = const_TIMEOUT
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153 kwargs["reply_handler"] = _callback
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154 kwargs["error_handler"] = lambda err: _errback(
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155 dbus_to_bridge_exception(err)
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156 )
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157
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158 try:
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159 return method(*args, **kwargs)
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160 except ValueError as e:
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161 if e.args[0].startswith("Unable to guess signature"):
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162 # XXX: if frontend is started too soon after backend, the
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163 # inspection misses methods (notably plugin dynamically added
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164 # methods). The following hack works around that by redoing the
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165 # cache of introspected methods signatures.
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166 log.debug("using hack to work around inspection issue")
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167 proxy = self.db_plugin_iface.proxy_object
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168 IN_PROGRESS = proxy.INTROSPECT_STATE_INTROSPECT_IN_PROGRESS
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169 proxy._introspect_state = IN_PROGRESS
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170 proxy._Introspect()
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171 return self.db_plugin_iface.get_dbus_method(name)(*args, **kwargs)
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172 raise e
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173
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174 return get_plugin_method
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175
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176
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177 ##METHODS_PART##
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178
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179
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180 class AIOBridge(bridge):
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181
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182 def register_signal(self, functionName, handler, iface="core"):
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183 loop = asyncio.get_running_loop()
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184 async_handler = lambda *args: asyncio.run_coroutine_threadsafe(
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185 handler(*args), loop
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186 )
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187 return super().register_signal(functionName, async_handler, iface)
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188
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189 def __getattribute__(self, name):
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190 """usual __getattribute__ if the method exists, else try to find a plugin method"""
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191 try:
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192 return object.__getattribute__(self, name)
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193 except AttributeError:
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194 # The attribute is not found, we try the plugin proxy to find the requested method
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195 def get_plugin_method(*args, **kwargs):
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196 loop = asyncio.get_running_loop()
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197 fut = loop.create_future()
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198 method = getattr(self.db_plugin_iface, name)
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199 reply_handler = lambda ret=None: loop.call_soon_threadsafe(
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200 fut.set_result, ret
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201 )
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202 error_handler = lambda err: loop.call_soon_threadsafe(
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203 fut.set_exception, dbus_to_bridge_exception(err)
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204 )
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205 try:
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206 method(
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207 *args,
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208 **kwargs,
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209 timeout=const_TIMEOUT,
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210 reply_handler=reply_handler,
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211 error_handler=error_handler,
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212 )
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213 except ValueError as e:
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214 if e.args[0].startswith("Unable to guess signature"):
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215 # same hack as for bridge.__getattribute__
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216 log.warning("using hack to work around inspection issue")
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217 proxy = self.db_plugin_iface.proxy_object
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218 IN_PROGRESS = proxy.INTROSPECT_STATE_INTROSPECT_IN_PROGRESS
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219 proxy._introspect_state = IN_PROGRESS
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220 proxy._Introspect()
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221 self.db_plugin_iface.get_dbus_method(name)(
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222 *args,
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223 **kwargs,
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224 timeout=const_TIMEOUT,
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225 reply_handler=reply_handler,
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226 error_handler=error_handler,
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227 )
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228
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229 else:
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230 raise e
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231 return fut
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232
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233 return get_plugin_method
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234
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235 def bridge_connect(self):
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236 loop = asyncio.get_running_loop()
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237 fut = loop.create_future()
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238 super().bridge_connect(
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239 callback=lambda: loop.call_soon_threadsafe(fut.set_result, None),
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240 errback=lambda e: loop.call_soon_threadsafe(fut.set_exception, e),
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241 )
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242 return fut
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243
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244
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245 ##ASYNC_METHODS_PART##