Mercurial > libervia-backend
annotate src/bridge/bridge_constructor/dbus_core_template.py @ 425:e4e9187e3b5b
backend, bridge: asynchronous history
quick_frontend: use of asynchronous history
| author | Goffi <goffi@goffi.org> |
|---|---|
| date | Tue, 08 Nov 2011 01:08:11 +0100 |
| parents | 72c13313b6d6 |
| children | cf005701624b |
| rev | line source |
|---|---|
| 267 | 1 #!/usr/bin/python |
| 2 #-*- coding: utf-8 -*- | |
| 3 | |
| 4 """ | |
| 5 SAT: a jabber client | |
| 6 Copyright (C) 2009, 2010, 2011 Jérôme Poisson (goffi@goffi.org) | |
| 7 | |
| 8 This program is free software: you can redistribute it and/or modify | |
| 9 it under the terms of the GNU General Public License as published by | |
| 10 the Free Software Foundation, either version 3 of the License, or | |
| 11 (at your option) any later version. | |
| 12 | |
| 13 This program is distributed in the hope that it will be useful, | |
| 14 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 16 GNU General Public License for more details. | |
| 17 | |
| 18 You should have received a copy of the GNU General Public License | |
| 19 along with this program. If not, see <http://www.gnu.org/licenses/>. | |
| 20 """ | |
| 21 | |
| 22 | |
| 23 from bridge import Bridge | |
| 24 import dbus | |
| 25 import dbus.service | |
| 26 import dbus.mainloop.glib | |
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27 from logging import debug, info, error |
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28 from twisted.internet.defer import Deferred |
| 267 | 29 |
| 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" |
| 267 | 35 |
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36 class MethodNotRegistered(dbus.DBusException): |
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37 _dbus_error_name = const_ERROR_PREFIX + ".MethodNotRegistered" |
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38 |
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39 class InternalError(dbus.DBusException): |
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40 _dbus_error_name = const_ERROR_PREFIX + ".InternalError" |
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41 |
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42 class AsyncNotDeferred(dbus.DBusException): |
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43 _dbus_error_name = const_ERROR_PREFIX + ".AsyncNotDeferred" |
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44 |
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45 class DeferredNotAsync(dbus.DBusException): |
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46 _dbus_error_name = const_ERROR_PREFIX + ".DeferredNotAsync" |
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47 |
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48 class GenericException(dbus.DBusException): |
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49 def __init__(self, twisted_error): |
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50 super(GenericException,self).__init__() |
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51 mess = twisted_error.getErrorMessage() |
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52 self._dbus_error_name = const_ERROR_PREFIX+"."+ (mess or str(err.__class__)) |
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53 |
| 267 | 54 class DbusObject(dbus.service.Object): |
| 55 | |
| 56 def __init__(self, bus, path): | |
| 57 dbus.service.Object.__init__(self, bus, path) | |
| 58 debug("Init DbusObject...") | |
| 59 self.cb={} | |
| 60 | |
| 61 def register(self, name, cb): | |
| 62 self.cb[name]=cb | |
| 63 | |
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64 def _callback(self, name, *args, **kwargs): |
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65 """call the callback if it exists, raise an exception else |
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66 if the callback return a deferred, use async methods""" |
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67 if not name in self.cb: |
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68 raise MethodNotRegistered |
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69 |
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70 if "callback" in kwargs: |
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71 #we must have errback too |
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72 if not "errback" in kwargs: |
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73 error("errback is missing in method call [%s]" % name) |
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74 raise InternalError |
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75 callback = kwargs.pop("callback") |
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76 errback = kwargs.pop("errback") |
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77 async = True |
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78 else: |
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79 async = False |
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80 result = self.cb[name](*args, **kwargs) |
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81 if async: |
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82 if not isinstance(result, Deferred): |
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83 error("Asynchronous method [%s] does not return a Deferred." % name) |
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84 raise AsyncNotDeferred |
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85 result.addCallback(callback) |
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86 result.addErrback(lambda err:errback(GenericException(err))) |
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87 else: |
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88 if isinstance(result, Deferred): |
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89 error("Synchronous method [%s] return a Deferred." % name) |
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90 raise DeferredNotAsync |
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91 return result |
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92 |
| 267 | 93 ### signals ### |
| 94 | |
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95 @dbus.service.signal(const_INT_PREFIX+const_PLUGIN_SUFFIX, |
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96 signature='') |
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97 def dummySignal(self): |
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98 #FIXME: workaround for addSignal (doesn't work if one method doensn't |
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99 # already exist for plugins), probably missing some initialisation, need |
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100 # further investigations |
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101 pass |
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102 |
| 267 | 103 ##SIGNALS_PART## |
| 104 | |
| 105 ### methods ### | |
| 106 | |
| 107 ##METHODS_PART## | |
| 108 | |
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109 def __attributes(self, in_sign): |
| 267 | 110 """Return arguments to user given a in_sign |
| 111 @param in_sign: in_sign in the short form (using s,a,i,b etc) | |
| 112 @return: list of arguments that correspond to a in_sign (e.g.: "sss" return "arg1, arg2, arg3")""" | |
| 113 i=0 | |
| 114 idx=0 | |
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115 attr=[] |
| 267 | 116 while i<len(in_sign): |
| 117 if in_sign[i] not in ['b','y','n','i','x','q','u','t','d','s','a']: | |
| 118 raise ParseError("Unmanaged attribute type [%c]" % in_sign[i]) | |
| 119 | |
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120 attr.append("arg_%i" % idx) |
| 267 | 121 idx+=1 |
| 122 | |
| 123 if in_sign[i] == 'a': | |
| 124 i+=1 | |
| 125 if in_sign[i]!='{' and in_sign[i]!='(': #FIXME: must manage tuples out of arrays | |
| 126 i+=1 | |
| 127 continue #we have a simple type for the array | |
| 128 opening_car = in_sign[i] | |
| 129 assert(opening_car in ['{','(']) | |
| 130 closing_car = '}' if opening_car == '{' else ')' | |
| 131 opening_count = 1 | |
| 132 while (True): #we have a dict or a list of tuples | |
| 133 i+=1 | |
| 134 if i>=len(in_sign): | |
| 135 raise ParseError("missing }") | |
| 136 if in_sign[i] == opening_car: | |
| 137 opening_count+=1 | |
| 138 if in_sign[i] == closing_car: | |
| 139 opening_count-=1 | |
| 140 if opening_count == 0: | |
| 141 break | |
| 142 i+=1 | |
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143 return attr |
| 267 | 144 |
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145 def addMethod(self, name, int_suffix, in_sign, out_sign, async=False, doc={}): |
| 267 | 146 """Dynamically add a method to Dbus Bridge""" |
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147 _attributes = self.__attributes(in_sign) |
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148 |
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149 if async: |
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150 _attributes.extend(['callback','errback']) |
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151 |
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152 attributes = ', '.join(_attributes) |
| 267 | 153 |
| 154 code = compile ('def '+name+' (self,'+attributes+'): return self.cb["'+name+'"]('+attributes+')', '<DBus bridge>','exec') | |
| 155 exec (code) | |
| 156 method = locals()[name] | |
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157 async_callbacks = ('callback', 'errback') if async else None |
| 267 | 158 setattr(DbusObject, name, dbus.service.method( |
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159 const_INT_PREFIX+int_suffix, in_signature=in_sign, out_signature=out_sign, |
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160 async_callbacks=async_callbacks)(method)) |
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161 function = getattr(self, name) |
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162 func_table = self._dbus_class_table[self.__class__.__module__ + '.' + self.__class__.__name__][function._dbus_interface] |
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163 func_table[function.__name__] = function #Needed for introspection |
| 267 | 164 |
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165 def addSignal(self, name, int_suffix, signature, doc={}): |
| 267 | 166 """Dynamically add a signal to Dbus Bridge""" |
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167 attributes = ', '.join(self.__attributes(signature)) |
| 267 | 168 |
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169 #code = compile ('def '+name+' (self,'+attributes+'): debug ("'+name+' signal")', '<DBus bridge>','exec') #XXX: the debug is too annoying with xmllog |
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170 code = compile ('def '+name+' (self,'+attributes+'): pass', '<DBus bridge>','exec') |
| 267 | 171 exec (code) |
| 172 signal = locals()[name] | |
| 173 setattr(DbusObject, name, dbus.service.signal( | |
| 174 const_INT_PREFIX+int_suffix, signature=signature)(signal)) | |
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Goffi <goffi@goffi.org>
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272
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changeset
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175 function = getattr(self, name) |
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c25371424090
dbus bridge: fixed introspection for dynamically added methods and signals
Goffi <goffi@goffi.org>
parents:
272
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changeset
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176 func_table = self._dbus_class_table[self.__class__.__module__ + '.' + self.__class__.__name__][function._dbus_interface] |
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c25371424090
dbus bridge: fixed introspection for dynamically added methods and signals
Goffi <goffi@goffi.org>
parents:
272
diff
changeset
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177 func_table[function.__name__] = function #Needed for introspection |
| 267 | 178 |
| 179 class DBusBridge(Bridge): | |
| 180 def __init__(self): | |
| 181 dbus.mainloop.glib.DBusGMainLoop(set_as_default=True) | |
| 182 Bridge.__init__(self) | |
| 183 info ("Init DBus...") | |
| 184 self.session_bus = dbus.SessionBus() | |
| 185 self.dbus_name = dbus.service.BusName(const_INT_PREFIX, self.session_bus) | |
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eb9d33ba4e36
bridge: templates' constants can now be overrided
Goffi <goffi@goffi.org>
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337
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186 self.dbus_bridge = DbusObject(self.session_bus, const_OBJ_PATH) |
| 267 | 187 |
| 188 ##DIRECT_CALLS## | |
| 189 | |
| 190 def register(self, name, callback): | |
| 191 debug("registering DBus bridge method [%s]", name) | |
| 192 self.dbus_bridge.register(name, callback) | |
| 193 | |
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e044d1dc37d1
dbus bridge: asynchrone methods management
Goffi <goffi@goffi.org>
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194 def addMethod(self, name, int_suffix, in_sign, out_sign, method, async=False, doc={}): |
| 267 | 195 """Dynamically add a method to Dbus Bridge""" |
| 196 print ("Adding method [%s] to DBus bridge" % name) | |
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197 self.dbus_bridge.addMethod(name, int_suffix, in_sign, out_sign, async, doc) |
| 267 | 198 self.register(name, method) |
| 199 | |
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dbus bridge: added doc parameter, unmanaged yet
Goffi <goffi@goffi.org>
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200 def addSignal(self, name, int_suffix, signature, doc={}): |
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dbus bridge: asynchrone methods management
Goffi <goffi@goffi.org>
parents:
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201 self.dbus_bridge.addSignal(name, int_suffix, signature, doc) |
| 267 | 202 setattr(DBusBridge, name, getattr(self.dbus_bridge, name)) |
| 203 |