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annotate sat/bridge/bridge_constructor/constructors/dbus/dbus_frontend_template.py @ 3042:964abd07dc03

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bridge (dbus): AsyncIO version of D-Bus bridge: The frontends D-Bus bridge has now an AIOBridge version which can be instantiated to use asyncio (the loop must be managed by frontends).
author Goffi <goffi@goffi.org>
date Tue, 01 Oct 2019 22:49:10 +0200
parents ab2696e34d29
children 9d0df638c8b4
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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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62
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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##