Mercurial > libervia-backend

annotate src/bridge/bridge_constructor/dbus_frontend_template.py @ 1062:95758ef3faa8

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bridge: async failures are more detailed (full class name + error message)
author souliane <souliane@mailoo.org>
date Sat, 07 Jun 2014 15:20:39 +0200
parents 301b342c697a
children d123d61976c8
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1 #!/usr/bin/python
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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, 2010, 2011, 2012, 2013, 2014 Jérôme Poisson (goffi@goffi.org)
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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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11
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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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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 from sat.core.i18n import _
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21 from bridge_frontend import BridgeFrontend, BridgeException
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22 import dbus
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23 from sat.core.log import getLogger
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24 log = getLogger(__name__)
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25 from sat.core.exceptions import BridgeExceptionNoService, BridgeInitError
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26
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27 from dbus.mainloop.glib import DBusGMainLoop
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28 DBusGMainLoop(set_as_default=True)
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30 const_INT_PREFIX = "org.goffi.SAT" # Interface prefix
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31 const_ERROR_PREFIX = const_INT_PREFIX + ".error"
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32 const_OBJ_PATH = '/org/goffi/SAT/bridge'
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33 const_CORE_SUFFIX = ".core"
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34 const_PLUGIN_SUFFIX = ".plugin"
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37 def dbus_to_bridge_exception(dbus_e):
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38 """Convert a DBusException to a BridgeException.
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39
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40 @param dbus_e (DBusException)
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41 @return: BridgeException
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42 """
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43 name = dbus_e.get_dbus_name()[len(const_ERROR_PREFIX) + 1:]
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44 return BridgeException(name, dbus_e.get_dbus_message())
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46
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47 class DBusBridgeFrontend(BridgeFrontend):
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48 def __init__(self):
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49 try:
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50 self.sessions_bus = dbus.SessionBus()
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51 self.db_object = self.sessions_bus.get_object(const_INT_PREFIX,
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52 const_OBJ_PATH)
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53 self.db_core_iface = dbus.Interface(self.db_object,
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54 dbus_interface=const_INT_PREFIX + const_CORE_SUFFIX)
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55 self.db_plugin_iface = dbus.Interface(self.db_object,
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56 dbus_interface=const_INT_PREFIX + const_PLUGIN_SUFFIX)
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57 except dbus.exceptions.DBusException, e:
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58 if e._dbus_error_name == 'org.freedesktop.DBus.Error.ServiceUnknown':
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59 raise BridgeExceptionNoService
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60 elif e._dbus_error_name == 'org.freedesktop.DBus.Error.NotSupported':
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61 log.error(_(u"D-Bus is not launched, please see README to see instructions on how to launch it"))
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62 raise BridgeInitError
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63 else:
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64 raise e
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65 #props = self.db_core_iface.getProperties()
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66
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67 def register(self, functionName, handler, iface="core"):
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68 if iface == "core":
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69 self.db_core_iface.connect_to_signal(functionName, handler)
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70 elif iface == "plugin":
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71 self.db_plugin_iface.connect_to_signal(functionName, handler)
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72 else:
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73 log.error(_('Unknown interface'))
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74
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75 def __getattribute__(self, name):
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76 """ usual __getattribute__ if the method exists, else try to find a plugin method """
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77 try:
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78 return object.__getattribute__(self, name)
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79 except AttributeError:
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80 # The attribute is not found, we try the plugin proxy to find the requested method
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81
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82 def getPluginMethod(*args, **kwargs):
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83 # We first check if we have an async call. We detect this in two ways:
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84 # - if we have the 'callback' and 'errback' keyword arguments
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85 # - or if the last two arguments are callable
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86
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87 async = False
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89 if kwargs:
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90 if 'callback' in kwargs and 'errback' in kwargs:
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91 async = True
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92 _callback = kwargs.pop('callback')
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93 _errback = kwargs.pop('errback')
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94 elif len(args) >= 2 and callable(args[-1]) and callable(args[-2]):
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95 async = True
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96 args = list(args)
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97 _errback = args.pop()
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98 _callback = args.pop()
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100 method = getattr(self.db_plugin_iface, name)
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101
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102 if async:
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103 kwargs['reply_handler'] = _callback
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104 kwargs['error_handler'] = lambda err: _errback(dbus_to_bridge_exception(err))
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105
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106 return method(*args, **kwargs)
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107
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108 return getPluginMethod
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109 ##METHODS_PART##