Mercurial > libervia-backend

annotate src/bridge/bridge_constructor/dbus_frontend_template.py @ 2053:a3c2866841f7

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jp (debug): method callback now handles methods without return value
author Goffi <goffi@goffi.org>
date Sun, 28 Aug 2016 20:10:04 +0200
parents 2daf7b4c6756
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1934
2daf7b4c6756 use of /usr/bin/env instead of /usr/bin/python in shebang
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1 #!/usr/bin/env python2
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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) 2009-2016 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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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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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 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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29
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30 import ast
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31
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32 const_INT_PREFIX = "org.goffi.SAT" # Interface prefix
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33 const_ERROR_PREFIX = const_INT_PREFIX + ".error"
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34 const_OBJ_PATH = '/org/goffi/SAT/bridge'
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35 const_CORE_SUFFIX = ".core"
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36 const_PLUGIN_SUFFIX = ".plugin"
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37 const_TIMEOUT = 120
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39
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40 def dbus_to_bridge_exception(dbus_e):
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41 """Convert a DBusException to a BridgeException.
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42
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43 @param dbus_e (DBusException)
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44 @return: BridgeException
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45 """
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46 full_name = dbus_e.get_dbus_name()
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47 if full_name.startswith(const_ERROR_PREFIX):
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48 name = dbus_e.get_dbus_name()[len(const_ERROR_PREFIX) + 1:]
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49 else:
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50 name = full_name
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51 # XXX: dbus_e.args doesn't contain the original DBusException args, but we
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52 # receive its serialized form in dbus_e.args[0]. From that we can rebuild
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53 # the original arguments list thanks to ast.literal_eval (secure eval).
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54 message = dbus_e.get_dbus_message() # similar to dbus_e.args[0]
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55 try:
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56 message, condition = ast.literal_eval(message)
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57 except (SyntaxError, ValueError, TypeError):
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58 condition = ''
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59 return BridgeException(name, message, condition)
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60
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61
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62 class DBusBridgeFrontend(BridgeFrontend):
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63 def __init__(self):
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64 try:
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65 self.sessions_bus = dbus.SessionBus()
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66 self.db_object = self.sessions_bus.get_object(const_INT_PREFIX,
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67 const_OBJ_PATH)
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68 self.db_core_iface = dbus.Interface(self.db_object,
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69 dbus_interface=const_INT_PREFIX + const_CORE_SUFFIX)
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70 self.db_plugin_iface = dbus.Interface(self.db_object,
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71 dbus_interface=const_INT_PREFIX + const_PLUGIN_SUFFIX)
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72 except dbus.exceptions.DBusException, e:
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73 if e._dbus_error_name in ('org.freedesktop.DBus.Error.ServiceUnknown',
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74 'org.freedesktop.DBus.Error.Spawn.ExecFailed'):
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75 raise BridgeExceptionNoService
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76 elif e._dbus_error_name == 'org.freedesktop.DBus.Error.NotSupported':
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77 log.error(_(u"D-Bus is not launched, please see README to see instructions on how to launch it"))
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78 raise BridgeInitError
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79 else:
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80 raise e
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81 #props = self.db_core_iface.getProperties()
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82
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83 def register(self, functionName, handler, iface="core"):
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84 if iface == "core":
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85 self.db_core_iface.connect_to_signal(functionName, handler)
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86 elif iface == "plugin":
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87 self.db_plugin_iface.connect_to_signal(functionName, handler)
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88 else:
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89 log.error(_('Unknown interface'))
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90
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91 def __getattribute__(self, name):
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92 """ usual __getattribute__ if the method exists, else try to find a plugin method """
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93 try:
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94 return object.__getattribute__(self, name)
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95 except AttributeError:
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96 # The attribute is not found, we try the plugin proxy to find the requested method
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97
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98 def getPluginMethod(*args, **kwargs):
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99 # We first check if we have an async call. We detect this in two ways:
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100 # - if we have the 'callback' and 'errback' keyword arguments
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101 # - or if the last two arguments are callable
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102
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103 async = False
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104 args = list(args)
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105
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106 if kwargs:
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107 if 'callback' in kwargs:
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108 async = True
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109 _callback = kwargs.pop('callback')
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110 _errback = kwargs.pop('errback', lambda failure: log.error(unicode(failure)))
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111 try:
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112 args.append(kwargs.pop('profile'))
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113 except KeyError:
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114 try:
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115 args.append(kwargs.pop('profile_key'))
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116 except KeyError:
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117 pass
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118 # at this point, kwargs should be empty
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119 if kwargs:
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120 log.warnings(u"unexpected keyword arguments, they will be ignored: {}".format(kwargs))
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121 elif len(args) >= 2 and callable(args[-1]) and callable(args[-2]):
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122 async = True
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123 _errback = args.pop()
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124 _callback = args.pop()
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125
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126 method = getattr(self.db_plugin_iface, name)
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127
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Goffi <goffi@goffi.org>
parents: 562
diff changeset
128 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
129 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
130 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
131 kwargs['error_handler'] = lambda err: _errback(dbus_to_bridge_exception(err))
568
239abc5484c9 bridge: generic plugin methods handling for frontend side in D-Bus Bridge \o/
Goffi <goffi@goffi.org>
parents: 562
diff changeset
132
239abc5484c9 bridge: generic plugin methods handling for frontend side in D-Bus Bridge \o/
Goffi <goffi@goffi.org>
parents: 562
diff changeset
133 return method(*args, **kwargs)
587
952322b1d490 Remove trailing whitespaces.
Emmanuel Gil Peyrot <linkmauve@linkmauve.fr>
parents: 572
diff changeset
134
568
239abc5484c9 bridge: generic plugin methods handling for frontend side in D-Bus Bridge \o/
Goffi <goffi@goffi.org>
parents: 562
diff changeset
135 return getPluginMethod
1290
faa1129559b8 core, frontends: refactoring to base Libervia on QuickFrontend (big mixed commit):
Goffi <goffi@goffi.org>
parents: 1188
diff changeset
136
723
f02e2c277f0c bridge: fixed bridge_constructor
Goffi <goffi@goffi.org>
parents: 709
diff changeset
137 ##METHODS_PART##