Mercurial > libervia-backend

annotate sat/bridge/bridge_constructor/constructors/dbus/dbus_frontend_template.py @ 3101:ab7e8ade848a

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plugin XEP-0045: added room statuses to metadata: room statuses are now sent with other metadata on bridge signals, and saved in Room instance. They give useful data on the room, for instance they can be used to know if a full jid is used in this room.
author Goffi <goffi@goffi.org>
date Mon, 30 Dec 2019 20:44:02 +0100
parents 964abd07dc03
children 9d0df638c8b4
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1 #!/usr/bin/env python3
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2 #-*- coding: utf-8 -*-
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3
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4 # SAT communication bridge
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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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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 import asyncio
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21 import dbus
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22 import ast
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23 from sat.core.i18n import _
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24 from .bridge_frontend import BridgeException
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25 from sat.core.log import getLogger
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26 from sat.core.exceptions import BridgeExceptionNoService, BridgeInitError
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27 from dbus.mainloop.glib import DBusGMainLoop
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29 DBusGMainLoop(set_as_default=True)
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30 log = getLogger(__name__)
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32
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33 const_INT_PREFIX = "org.salutatoi.SAT" # Interface prefix
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34 const_ERROR_PREFIX = const_INT_PREFIX + ".error"
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35 const_OBJ_PATH = '/org/salutatoi/SAT/bridge'
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36 const_CORE_SUFFIX = ".core"
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37 const_PLUGIN_SUFFIX = ".plugin"
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38 const_TIMEOUT = 120
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41 def dbus_to_bridge_exception(dbus_e):
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42 """Convert a DBusException to a BridgeException.
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43
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44 @param dbus_e (DBusException)
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45 @return: BridgeException
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46 """
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47 full_name = dbus_e.get_dbus_name()
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48 if full_name.startswith(const_ERROR_PREFIX):
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49 name = dbus_e.get_dbus_name()[len(const_ERROR_PREFIX) + 1:]
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50 else:
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51 name = full_name
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52 # XXX: dbus_e.args doesn't contain the original DBusException args, but we
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53 # receive its serialized form in dbus_e.args[0]. From that we can rebuild
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54 # the original arguments list thanks to ast.literal_eval (secure eval).
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55 message = dbus_e.get_dbus_message() # similar to dbus_e.args[0]
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56 try:
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57 message, condition = ast.literal_eval(message)
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58 except (SyntaxError, ValueError, TypeError):
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59 condition = ''
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60 return BridgeException(name, message, condition)
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63 class Bridge:
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65 def bridgeConnect(self, callback, errback):
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66 try:
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67 self.sessions_bus = dbus.SessionBus()
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68 self.db_object = self.sessions_bus.get_object(const_INT_PREFIX,
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69 const_OBJ_PATH)
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70 self.db_core_iface = dbus.Interface(self.db_object,
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71 dbus_interface=const_INT_PREFIX + const_CORE_SUFFIX)
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72 self.db_plugin_iface = dbus.Interface(self.db_object,
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73 dbus_interface=const_INT_PREFIX + const_PLUGIN_SUFFIX)
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74 except dbus.exceptions.DBusException as e:
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75 if e._dbus_error_name in ('org.freedesktop.DBus.Error.ServiceUnknown',
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76 'org.freedesktop.DBus.Error.Spawn.ExecFailed'):
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77 errback(BridgeExceptionNoService())
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78 elif e._dbus_error_name == 'org.freedesktop.DBus.Error.NotSupported':
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79 log.error(_("D-Bus is not launched, please see README to see instructions on how to launch it"))
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80 errback(BridgeInitError)
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81 else:
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82 errback(e)
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83 else:
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84 callback()
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85 #props = self.db_core_iface.getProperties()
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86
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87 def register_signal(self, functionName, handler, iface="core"):
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88 if iface == "core":
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89 self.db_core_iface.connect_to_signal(functionName, handler)
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90 elif iface == "plugin":
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91 self.db_plugin_iface.connect_to_signal(functionName, handler)
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92 else:
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93 log.error(_('Unknown interface'))
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94
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95 def __getattribute__(self, name):
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96 """ usual __getattribute__ if the method exists, else try to find a plugin method """
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97 try:
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98 return object.__getattribute__(self, name)
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99 except AttributeError:
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100 # The attribute is not found, we try the plugin proxy to find the requested method
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101
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102 def getPluginMethod(*args, **kwargs):
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103 # We first check if we have an async call. We detect this in two ways:
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104 # - if we have the 'callback' and 'errback' keyword arguments
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105 # - or if the last two arguments are callable
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106
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107 async_ = False
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108 args = list(args)
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109
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110 if kwargs:
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111 if 'callback' in kwargs:
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112 async_ = True
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113 _callback = kwargs.pop('callback')
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114 _errback = kwargs.pop('errback', lambda failure: log.error(str(failure)))
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115 try:
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116 args.append(kwargs.pop('profile'))
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117 except KeyError:
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118 try:
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119 args.append(kwargs.pop('profile_key'))
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120 except KeyError:
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121 pass
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122 # at this point, kwargs should be empty
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123 if kwargs:
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124 log.warnings("unexpected keyword arguments, they will be ignored: {}".format(kwargs))
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125 elif len(args) >= 2 and callable(args[-1]) and callable(args[-2]):
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126 async_ = True
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127 _errback = args.pop()
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128 _callback = args.pop()
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129
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130 method = getattr(self.db_plugin_iface, name)
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131
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132 if async_:
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133 kwargs['timeout'] = const_TIMEOUT
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134 kwargs['reply_handler'] = _callback
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135 kwargs['error_handler'] = lambda err: _errback(dbus_to_bridge_exception(err))
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136
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137 return method(*args, **kwargs)
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138
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139 return getPluginMethod
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140
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141 ##METHODS_PART##
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142
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143 class AIOBridge(Bridge):
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144
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145 def register_signal(self, functionName, handler, iface="core"):
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146 loop = asyncio.get_running_loop()
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147 async_handler = lambda *args: asyncio.run_coroutine_threadsafe(handler(*args), loop)
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148 return super().register_signal(functionName, async_handler, iface)
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149
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150 def __getattribute__(self, name):
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151 """ usual __getattribute__ if the method exists, else try to find a plugin method """
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152 try:
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153 return object.__getattribute__(self, name)
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154 except AttributeError:
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155 # The attribute is not found, we try the plugin proxy to find the requested method
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156 def getPluginMethod(*args, **kwargs):
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157 loop = asyncio.get_running_loop()
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158 fut = loop.create_future()
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159 method = getattr(self.db_plugin_iface, name)
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160 reply_handler = lambda ret=None: loop.call_soon_threadsafe(
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161 fut.set_result, ret)
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162 error_handler = lambda err: loop.call_soon_threadsafe(
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163 fut.set_exception, dbus_to_bridge_exception(err))
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164 method(
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165 *args,
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166 **kwargs,
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167 timeout=const_TIMEOUT,
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168 reply_handler=reply_handler,
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169 error_handler=error_handler
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170 )
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171 return fut
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172
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173 return getPluginMethod
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174
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175 def bridgeConnect(self):
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176 loop = asyncio.get_running_loop()
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177 fut = loop.create_future()
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178 super().bridgeConnect(
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179 callback=lambda: loop.call_soon_threadsafe(fut.set_result, None),
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180 errback=lambda e: loop.call_soon_threadsafe(fut.set_exception, e)
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181 )
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182 return fut
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183
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184 ##ASYNC_METHODS_PART##