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annotate sat/bridge/bridge_constructor/constructors/dbus/dbus_frontend_template.py @ 3728:b15644cae50d

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component AP gateway: JID/node ⟺ AP outbox conversion: - convert a combination of JID and optional pubsub node to AP actor handle (see `getJIDAndNode` for details) and vice versa - the gateway now provides a Pubsub service - retrieve pubsub node and convert it to AP collection, AP pagination is converted to RSM - do the opposite: convert AP collection to pubsub and handle RSM request. Due to ActivityStream collection pagination limitations, some RSM request produce inefficient requests, but caching should be used most of the time in the future and avoid the problem. - set specific name to HTTP Server - new `local_only` setting (`True` by default) to indicate if the gateway can request or not XMPP Pubsub nodes from other servers - disco info now specifies important features such as Pubsub RSM, and nodes metadata ticket 363
author Goffi <goffi@goffi.org>
date Tue, 25 Jan 2022 17:54:06 +0100
parents 71cfe9334f73
children 524856bd7b19
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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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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 sat.core.i18n import _
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23 from sat.tools import config
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24 from sat.core.log import getLogger
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25 from sat.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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30 DBusGMainLoop(set_as_default=True)
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31 log = getLogger(__name__)
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34 # Interface prefix
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35 const_INT_PREFIX = config.getConfig(
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36 config.parseMainConf(),
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37 "",
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38 "bridge_dbus_int_prefix",
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39 "org.libervia.Libervia")
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40 const_ERROR_PREFIX = const_INT_PREFIX + ".error"
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41 const_OBJ_PATH = '/org/libervia/Libervia/bridge'
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42 const_CORE_SUFFIX = ".core"
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43 const_PLUGIN_SUFFIX = ".plugin"
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44 const_TIMEOUT = 120
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47 def dbus_to_bridge_exception(dbus_e):
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48 """Convert a DBusException to a BridgeException.
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49
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50 @param dbus_e (DBusException)
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51 @return: BridgeException
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52 """
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53 full_name = dbus_e.get_dbus_name()
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54 if full_name.startswith(const_ERROR_PREFIX):
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55 name = dbus_e.get_dbus_name()[len(const_ERROR_PREFIX) + 1:]
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56 else:
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57 name = full_name
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58 # XXX: dbus_e.args doesn't contain the original DBusException args, but we
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59 # receive its serialized form in dbus_e.args[0]. From that we can rebuild
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60 # the original arguments list thanks to ast.literal_eval (secure eval).
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61 message = dbus_e.get_dbus_message() # similar to dbus_e.args[0]
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62 try:
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63 message, condition = ast.literal_eval(message)
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64 except (SyntaxError, ValueError, TypeError):
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65 condition = ''
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66 return BridgeException(name, message, condition)
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68
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69 class Bridge:
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71 def bridgeConnect(self, callback, errback):
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72 try:
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73 self.sessions_bus = dbus.SessionBus()
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74 self.db_object = self.sessions_bus.get_object(const_INT_PREFIX,
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75 const_OBJ_PATH)
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76 self.db_core_iface = dbus.Interface(self.db_object,
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77 dbus_interface=const_INT_PREFIX + const_CORE_SUFFIX)
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78 self.db_plugin_iface = dbus.Interface(self.db_object,
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79 dbus_interface=const_INT_PREFIX + const_PLUGIN_SUFFIX)
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80 except dbus.exceptions.DBusException as e:
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81 if e._dbus_error_name in ('org.freedesktop.DBus.Error.ServiceUnknown',
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82 'org.freedesktop.DBus.Error.Spawn.ExecFailed'):
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83 errback(BridgeExceptionNoService())
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84 elif e._dbus_error_name == 'org.freedesktop.DBus.Error.NotSupported':
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85 log.error(_("D-Bus is not launched, please see README to see instructions on how to launch it"))
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86 errback(BridgeInitError)
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87 else:
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88 errback(e)
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89 else:
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90 callback()
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91 #props = self.db_core_iface.getProperties()
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92
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93 def register_signal(self, functionName, handler, iface="core"):
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94 if iface == "core":
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95 self.db_core_iface.connect_to_signal(functionName, handler)
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96 elif iface == "plugin":
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97 self.db_plugin_iface.connect_to_signal(functionName, handler)
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98 else:
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99 log.error(_('Unknown interface'))
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100
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101 def __getattribute__(self, name):
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102 """ usual __getattribute__ if the method exists, else try to find a plugin method """
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103 try:
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104 return object.__getattribute__(self, name)
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105 except AttributeError:
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106 # The attribute is not found, we try the plugin proxy to find the requested method
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107
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108 def getPluginMethod(*args, **kwargs):
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109 # We first check if we have an async call. We detect this in two ways:
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110 # - if we have the 'callback' and 'errback' keyword arguments
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111 # - or if the last two arguments are callable
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112
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113 async_ = False
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114 args = list(args)
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115
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116 if kwargs:
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117 if 'callback' in kwargs:
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118 async_ = True
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119 _callback = kwargs.pop('callback')
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120 _errback = kwargs.pop('errback', lambda failure: log.error(str(failure)))
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121 try:
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122 args.append(kwargs.pop('profile'))
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diff changeset
123 except KeyError:
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diff changeset
124 try:
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125 args.append(kwargs.pop('profile_key'))
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diff changeset
126 except KeyError:
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diff changeset
127 pass
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diff changeset
128 # at this point, kwargs should be empty
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129 if kwargs:
3208
4f00fdf11445 bridge (constructor/dbus): typo
Goffi <goffi@goffi.org>
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130 log.warning("unexpected keyword arguments, they will be ignored: {}".format(kwargs))
595
1f160467f5de Fix pep8 support in src/bridge.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 587
diff changeset
131 elif len(args) >= 2 and callable(args[-1]) and callable(args[-2]):
3028
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132 async_ = True
568
239abc5484c9 bridge: generic plugin methods handling for frontend side in D-Bus Bridge \o/
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133 _errback = args.pop()
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diff changeset
134 _callback = args.pop()
587
952322b1d490 Remove trailing whitespaces.
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parents: 572
diff changeset
135
568
239abc5484c9 bridge: generic plugin methods handling for frontend side in D-Bus Bridge \o/
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136 method = getattr(self.db_plugin_iface, name)
587
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parents: 572
diff changeset
137
3028
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diff changeset
138 if async_:
1072
d123d61976c8 bridge (D-Bus): frontend side now use a 120 s timeout for async calls
Goffi <goffi@goffi.org>
parents: 1062
diff changeset
139 kwargs['timeout'] = const_TIMEOUT
568
239abc5484c9 bridge: generic plugin methods handling for frontend side in D-Bus Bridge \o/
Goffi <goffi@goffi.org>
parents: 562
diff changeset
140 kwargs['reply_handler'] = _callback
1062
95758ef3faa8 bridge: async failures are more detailed (full class name + error message)
souliane <souliane@mailoo.org>
parents: 993
diff changeset
141 kwargs['error_handler'] = lambda err: _errback(dbus_to_bridge_exception(err))
568
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parents: 562
diff changeset
142
3648
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143 try:
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144 return method(*args, **kwargs)
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145 except ValueError as e:
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diff changeset
146 if e.args[0].startswith("Unable to guess signature"):
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diff changeset
147 # XXX: if frontend is started too soon after backend, the
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148 # inspection misses methods (notably plugin dynamically added
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diff changeset
149 # methods). The following hack works around that by redoing the
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150 # cache of introspected methods signatures.
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151 log.debug("using hack to work around inspection issue")
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152 proxy = self.db_plugin_iface.proxy_object
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153 IN_PROGRESS = proxy.INTROSPECT_STATE_INTROSPECT_IN_PROGRESS
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154 proxy._introspect_state = IN_PROGRESS
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155 proxy._Introspect()
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156 return self.db_plugin_iface.get_dbus_method(name)(*args, **kwargs)
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diff changeset
157 raise e
587
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Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 572
diff changeset
158
568
239abc5484c9 bridge: generic plugin methods handling for frontend side in D-Bus Bridge \o/
Goffi <goffi@goffi.org>
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diff changeset
159 return getPluginMethod
1290
faa1129559b8 core, frontends: refactoring to base Libervia on QuickFrontend (big mixed commit):
Goffi <goffi@goffi.org>
parents: 1188
diff changeset
160
723
f02e2c277f0c bridge: fixed bridge_constructor
Goffi <goffi@goffi.org>
parents: 709
diff changeset
161 ##METHODS_PART##
3042
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diff changeset
162
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163 class AIOBridge(Bridge):
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164
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diff changeset
165 def register_signal(self, functionName, handler, iface="core"):
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diff changeset
166 loop = asyncio.get_running_loop()
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diff changeset
167 async_handler = lambda *args: asyncio.run_coroutine_threadsafe(handler(*args), loop)
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parents: 3028
diff changeset
168 return super().register_signal(functionName, async_handler, iface)
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parents: 3028
diff changeset
169
964abd07dc03 bridge (dbus): AsyncIO version of D-Bus bridge:
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diff changeset
170 def __getattribute__(self, name):
964abd07dc03 bridge (dbus): AsyncIO version of D-Bus bridge:
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diff changeset
171 """ usual __getattribute__ if the method exists, else try to find a plugin method """
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parents: 3028
diff changeset
172 try:
964abd07dc03 bridge (dbus): AsyncIO version of D-Bus bridge:
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parents: 3028
diff changeset
173 return object.__getattribute__(self, name)
964abd07dc03 bridge (dbus): AsyncIO version of D-Bus bridge:
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parents: 3028
diff changeset
174 except AttributeError:
964abd07dc03 bridge (dbus): AsyncIO version of D-Bus bridge:
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parents: 3028
diff changeset
175 # The attribute is not found, we try the plugin proxy to find the requested method
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parents: 3028
diff changeset
176 def getPluginMethod(*args, **kwargs):
964abd07dc03 bridge (dbus): AsyncIO version of D-Bus bridge:
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diff changeset
177 loop = asyncio.get_running_loop()
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diff changeset
178 fut = loop.create_future()
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parents: 3028
diff changeset
179 method = getattr(self.db_plugin_iface, name)
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parents: 3028
diff changeset
180 reply_handler = lambda ret=None: loop.call_soon_threadsafe(
964abd07dc03 bridge (dbus): AsyncIO version of D-Bus bridge:
Goffi <goffi@goffi.org>
parents: 3028
diff changeset
181 fut.set_result, ret)
964abd07dc03 bridge (dbus): AsyncIO version of D-Bus bridge:
Goffi <goffi@goffi.org>
parents: 3028
diff changeset
182 error_handler = lambda err: loop.call_soon_threadsafe(
964abd07dc03 bridge (dbus): AsyncIO version of D-Bus bridge:
Goffi <goffi@goffi.org>
parents: 3028
diff changeset
183 fut.set_exception, dbus_to_bridge_exception(err))
3648
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parents: 3480
diff changeset
184 try:
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parents: 3480
diff changeset
185 method(
71cfe9334f73 bridge (dbus/frontend): reintrospect signature in case of guess error:
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diff changeset
186 *args,
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parents: 3480
diff changeset
187 **kwargs,
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parents: 3480
diff changeset
188 timeout=const_TIMEOUT,
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parents: 3480
diff changeset
189 reply_handler=reply_handler,
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parents: 3480
diff changeset
190 error_handler=error_handler
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parents: 3480
diff changeset
191 )
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Goffi <goffi@goffi.org>
parents: 3480
diff changeset
192 except ValueError as e:
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Goffi <goffi@goffi.org>
parents: 3480
diff changeset
193 if e.args[0].startswith("Unable to guess signature"):
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parents: 3480
diff changeset
194 # same hack as for Bridge.__getattribute__
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parents: 3480
diff changeset
195 log.warning("using hack to work around inspection issue")
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parents: 3480
diff changeset
196 proxy = self.db_plugin_iface.proxy_object
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parents: 3480
diff changeset
197 IN_PROGRESS = proxy.INTROSPECT_STATE_INTROSPECT_IN_PROGRESS
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parents: 3480
diff changeset
198 proxy._introspect_state = IN_PROGRESS
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parents: 3480
diff changeset
199 proxy._Introspect()
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diff changeset
200 self.db_plugin_iface.get_dbus_method(name)(
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parents: 3480
diff changeset
201 *args,
71cfe9334f73 bridge (dbus/frontend): reintrospect signature in case of guess error:
Goffi <goffi@goffi.org>
parents: 3480
diff changeset
202 **kwargs,
71cfe9334f73 bridge (dbus/frontend): reintrospect signature in case of guess error:
Goffi <goffi@goffi.org>
parents: 3480
diff changeset
203 timeout=const_TIMEOUT,
71cfe9334f73 bridge (dbus/frontend): reintrospect signature in case of guess error:
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parents: 3480
diff changeset
204 reply_handler=reply_handler,
71cfe9334f73 bridge (dbus/frontend): reintrospect signature in case of guess error:
Goffi <goffi@goffi.org>
parents: 3480
diff changeset
205 error_handler=error_handler
71cfe9334f73 bridge (dbus/frontend): reintrospect signature in case of guess error:
Goffi <goffi@goffi.org>
parents: 3480
diff changeset
206 )
71cfe9334f73 bridge (dbus/frontend): reintrospect signature in case of guess error:
Goffi <goffi@goffi.org>
parents: 3480
diff changeset
207
71cfe9334f73 bridge (dbus/frontend): reintrospect signature in case of guess error:
Goffi <goffi@goffi.org>
parents: 3480
diff changeset
208 else:
71cfe9334f73 bridge (dbus/frontend): reintrospect signature in case of guess error:
Goffi <goffi@goffi.org>
parents: 3480
diff changeset
209 raise e
3042
964abd07dc03 bridge (dbus): AsyncIO version of D-Bus bridge:
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diff changeset
210 return fut
964abd07dc03 bridge (dbus): AsyncIO version of D-Bus bridge:
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parents: 3028
diff changeset
211
964abd07dc03 bridge (dbus): AsyncIO version of D-Bus bridge:
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parents: 3028
diff changeset
212 return getPluginMethod
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parents: 3028
diff changeset
213
964abd07dc03 bridge (dbus): AsyncIO version of D-Bus bridge:
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parents: 3028
diff changeset
214 def bridgeConnect(self):
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diff changeset
215 loop = asyncio.get_running_loop()
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diff changeset
216 fut = loop.create_future()
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parents: 3028
diff changeset
217 super().bridgeConnect(
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parents: 3028
diff changeset
218 callback=lambda: loop.call_soon_threadsafe(fut.set_result, None),
964abd07dc03 bridge (dbus): AsyncIO version of D-Bus bridge:
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parents: 3028
diff changeset
219 errback=lambda e: loop.call_soon_threadsafe(fut.set_exception, e)
964abd07dc03 bridge (dbus): AsyncIO version of D-Bus bridge:
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parents: 3028
diff changeset
220 )
964abd07dc03 bridge (dbus): AsyncIO version of D-Bus bridge:
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parents: 3028
diff changeset
221 return fut
964abd07dc03 bridge (dbus): AsyncIO version of D-Bus bridge:
Goffi <goffi@goffi.org>
parents: 3028
diff changeset
222
964abd07dc03 bridge (dbus): AsyncIO version of D-Bus bridge:
Goffi <goffi@goffi.org>
parents: 3028
diff changeset
223 ##ASYNC_METHODS_PART##