/usr/share/pyshared/dbus/proxies.py is in python-dbus 1.0.0-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 | # Copyright (C) 2003-2007 Red Hat Inc. <http://www.redhat.com/>
# Copyright (C) 2003 David Zeuthen
# Copyright (C) 2004 Rob Taylor
# Copyright (C) 2005-2007 Collabora Ltd. <http://www.collabora.co.uk/>
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation
# files (the "Software"), to deal in the Software without
# restriction, including without limitation the rights to use, copy,
# modify, merge, publish, distribute, sublicense, and/or sell copies
# of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
import logging
try:
from threading import RLock
except ImportError:
from dummy_threading import RLock
import _dbus_bindings
from dbus._expat_introspect_parser import process_introspection_data
from dbus.exceptions import (
DBusException, IntrospectionParserException, MissingErrorHandlerException,
MissingReplyHandlerException)
__docformat__ = 'restructuredtext'
_logger = logging.getLogger('dbus.proxies')
from _dbus_bindings import (
BUS_DAEMON_IFACE, BUS_DAEMON_NAME, BUS_DAEMON_PATH, INTROSPECTABLE_IFACE,
LOCAL_PATH)
from dbus._compat import is_py2
class _DeferredMethod:
"""A proxy method which will only get called once we have its
introspection reply.
"""
def __init__(self, proxy_method, append, block):
self._proxy_method = proxy_method
# the test suite relies on the existence of this property
self._method_name = proxy_method._method_name
self._append = append
self._block = block
def __call__(self, *args, **keywords):
if ('reply_handler' in keywords or
keywords.get('ignore_reply', False)):
# defer the async call til introspection finishes
self._append(self._proxy_method, args, keywords)
return None
else:
# we're being synchronous, so block
self._block()
return self._proxy_method(*args, **keywords)
def call_async(self, *args, **keywords):
self._append(self._proxy_method, args, keywords)
class _ProxyMethod:
"""A proxy method.
Typically a member of a ProxyObject. Calls to the
method produce messages that travel over the Bus and are routed
to a specific named Service.
"""
def __init__(self, proxy, connection, bus_name, object_path, method_name,
iface):
if object_path == LOCAL_PATH:
raise DBusException('Methods may not be called on the reserved '
'path %s' % LOCAL_PATH)
# trust that the proxy, and the properties it had, are OK
self._proxy = proxy
self._connection = connection
self._named_service = bus_name
self._object_path = object_path
# fail early if the method name is bad
_dbus_bindings.validate_member_name(method_name)
# the test suite relies on the existence of this property
self._method_name = method_name
# fail early if the interface name is bad
if iface is not None:
_dbus_bindings.validate_interface_name(iface)
self._dbus_interface = iface
def __call__(self, *args, **keywords):
reply_handler = keywords.pop('reply_handler', None)
error_handler = keywords.pop('error_handler', None)
ignore_reply = keywords.pop('ignore_reply', False)
signature = keywords.pop('signature', None)
if reply_handler is not None or error_handler is not None:
if reply_handler is None:
raise MissingReplyHandlerException()
elif error_handler is None:
raise MissingErrorHandlerException()
elif ignore_reply:
raise TypeError('ignore_reply and reply_handler cannot be '
'used together')
dbus_interface = keywords.pop('dbus_interface', self._dbus_interface)
if signature is None:
if dbus_interface is None:
key = self._method_name
else:
key = dbus_interface + '.' + self._method_name
signature = self._proxy._introspect_method_map.get(key, None)
if ignore_reply or reply_handler is not None:
self._connection.call_async(self._named_service,
self._object_path,
dbus_interface,
self._method_name,
signature,
args,
reply_handler,
error_handler,
**keywords)
else:
return self._connection.call_blocking(self._named_service,
self._object_path,
dbus_interface,
self._method_name,
signature,
args,
**keywords)
def call_async(self, *args, **keywords):
reply_handler = keywords.pop('reply_handler', None)
error_handler = keywords.pop('error_handler', None)
signature = keywords.pop('signature', None)
dbus_interface = keywords.pop('dbus_interface', self._dbus_interface)
if signature is None:
if dbus_interface:
key = dbus_interface + '.' + self._method_name
else:
key = self._method_name
signature = self._proxy._introspect_method_map.get(key, None)
self._connection.call_async(self._named_service,
self._object_path,
dbus_interface,
self._method_name,
signature,
args,
reply_handler,
error_handler,
**keywords)
class ProxyObject(object):
"""A proxy to the remote Object.
A ProxyObject is provided by the Bus. ProxyObjects
have member functions, and can be called like normal Python objects.
"""
ProxyMethodClass = _ProxyMethod
DeferredMethodClass = _DeferredMethod
INTROSPECT_STATE_DONT_INTROSPECT = 0
INTROSPECT_STATE_INTROSPECT_IN_PROGRESS = 1
INTROSPECT_STATE_INTROSPECT_DONE = 2
def __init__(self, conn=None, bus_name=None, object_path=None,
introspect=True, follow_name_owner_changes=False, **kwargs):
"""Initialize the proxy object.
:Parameters:
`conn` : `dbus.connection.Connection`
The bus or connection on which to find this object.
The keyword argument `bus` is a deprecated alias for this.
`bus_name` : str
A bus name for the application owning the object, to be used
as the destination for method calls and the sender for
signal matches. The keyword argument ``named_service`` is a
deprecated alias for this.
`object_path` : str
The object path at which the application exports the object
`introspect` : bool
If true (default), attempt to introspect the remote
object to find out supported methods and their signatures
`follow_name_owner_changes` : bool
If true (default is false) and the `bus_name` is a
well-known name, follow ownership changes for that name
"""
bus = kwargs.pop('bus', None)
if bus is not None:
if conn is not None:
raise TypeError('conn and bus cannot both be specified')
conn = bus
from warnings import warn
warn('Passing the bus parameter to ProxyObject by name is '
'deprecated: please use positional parameters',
DeprecationWarning, stacklevel=2)
named_service = kwargs.pop('named_service', None)
if named_service is not None:
if bus_name is not None:
raise TypeError('bus_name and named_service cannot both be '
'specified')
bus_name = named_service
from warnings import warn
warn('Passing the named_service parameter to ProxyObject by name '
'is deprecated: please use positional parameters',
DeprecationWarning, stacklevel=2)
if kwargs:
raise TypeError('ProxyObject.__init__ does not take these '
'keyword arguments: %s'
% ', '.join(kwargs.keys()))
if follow_name_owner_changes:
# we don't get the signals unless the Bus has a main loop
# XXX: using Bus internals
conn._require_main_loop()
self._bus = conn
if bus_name is not None:
_dbus_bindings.validate_bus_name(bus_name)
# the attribute is still called _named_service for the moment,
# for the benefit of telepathy-python
self._named_service = self._requested_bus_name = bus_name
_dbus_bindings.validate_object_path(object_path)
self.__dbus_object_path__ = object_path
if not follow_name_owner_changes:
self._named_service = conn.activate_name_owner(bus_name)
#PendingCall object for Introspect call
self._pending_introspect = None
#queue of async calls waiting on the Introspect to return
self._pending_introspect_queue = []
#dictionary mapping method names to their input signatures
self._introspect_method_map = {}
# must be a recursive lock because block() is called while locked,
# and calls the callback which re-takes the lock
self._introspect_lock = RLock()
if not introspect or self.__dbus_object_path__ == LOCAL_PATH:
self._introspect_state = self.INTROSPECT_STATE_DONT_INTROSPECT
else:
self._introspect_state = self.INTROSPECT_STATE_INTROSPECT_IN_PROGRESS
self._pending_introspect = self._Introspect()
bus_name = property(lambda self: self._named_service, None, None,
"""The bus name to which this proxy is bound. (Read-only,
may change.)
If the proxy was instantiated using a unique name, this property
is that unique name.
If the proxy was instantiated with a well-known name and with
``follow_name_owner_changes`` set false (the default), this
property is the unique name of the connection that owned that
well-known name when the proxy was instantiated, which might
not actually own the requested well-known name any more.
If the proxy was instantiated with a well-known name and with
``follow_name_owner_changes`` set true, this property is that
well-known name.
""")
requested_bus_name = property(lambda self: self._requested_bus_name,
None, None,
"""The bus name which was requested when this proxy was
instantiated.
""")
object_path = property(lambda self: self.__dbus_object_path__,
None, None,
"""The object-path of this proxy.""")
# XXX: We don't currently support this because it's the signal receiver
# that's responsible for tracking name owner changes, but it
# seems a natural thing to add in future.
#unique_bus_name = property(lambda self: something, None, None,
# """The unique name of the connection to which this proxy is
# currently bound. (Read-only, may change.)
# """)
def connect_to_signal(self, signal_name, handler_function, dbus_interface=None, **keywords):
"""Arrange for the given function to be called when the given signal
is received.
:Parameters:
`signal_name` : str
The name of the signal
`handler_function` : callable
A function to be called when the signal is emitted by
the remote object. Its positional arguments will be the
arguments of the signal; optionally, it may be given
keyword arguments as described below.
`dbus_interface` : str
Optional interface with which to qualify the signal name.
If None (the default) the handler will be called whenever a
signal of the given member name is received, whatever
its interface.
:Keywords:
`utf8_strings` : bool
If True, the handler function will receive any string
arguments as dbus.UTF8String objects (a subclass of str
guaranteed to be UTF-8). If False (default) it will receive
any string arguments as dbus.String objects (a subclass of
unicode).
`byte_arrays` : bool
If True, the handler function will receive any byte-array
arguments as dbus.ByteArray objects (a subclass of str).
If False (default) it will receive any byte-array
arguments as a dbus.Array of dbus.Byte (subclasses of:
a list of ints).
`sender_keyword` : str
If not None (the default), the handler function will receive
the unique name of the sending endpoint as a keyword
argument with this name
`destination_keyword` : str
If not None (the default), the handler function will receive
the bus name of the destination (or None if the signal is a
broadcast, as is usual) as a keyword argument with this name.
`interface_keyword` : str
If not None (the default), the handler function will receive
the signal interface as a keyword argument with this name.
`member_keyword` : str
If not None (the default), the handler function will receive
the signal name as a keyword argument with this name.
`path_keyword` : str
If not None (the default), the handler function will receive
the object-path of the sending object as a keyword argument
with this name
`message_keyword` : str
If not None (the default), the handler function will receive
the `dbus.lowlevel.SignalMessage` as a keyword argument with
this name.
`arg...` : unicode or UTF-8 str
If there are additional keyword parameters of the form
``arg``\ *n*, match only signals where the *n*\ th argument
is the value given for that keyword parameter. As of this time
only string arguments can be matched (in particular,
object paths and signatures can't).
"""
return \
self._bus.add_signal_receiver(handler_function,
signal_name=signal_name,
dbus_interface=dbus_interface,
bus_name=self._named_service,
path=self.__dbus_object_path__,
**keywords)
def _Introspect(self):
kwargs = {}
if is_py2:
kwargs['utf8_strings'] = True
return self._bus.call_async(self._named_service,
self.__dbus_object_path__,
INTROSPECTABLE_IFACE, 'Introspect', '', (),
self._introspect_reply_handler,
self._introspect_error_handler,
require_main_loop=False, **kwargs)
def _introspect_execute_queue(self):
# FIXME: potential to flood the bus
# We should make sure mainloops all have idle handlers
# and do one message per idle
for (proxy_method, args, keywords) in self._pending_introspect_queue:
proxy_method(*args, **keywords)
self._pending_introspect_queue = []
def _introspect_reply_handler(self, data):
self._introspect_lock.acquire()
try:
try:
self._introspect_method_map = process_introspection_data(data)
except IntrospectionParserException as e:
self._introspect_error_handler(e)
return
self._introspect_state = self.INTROSPECT_STATE_INTROSPECT_DONE
self._pending_introspect = None
self._introspect_execute_queue()
finally:
self._introspect_lock.release()
def _introspect_error_handler(self, error):
logging.basicConfig()
_logger.error("Introspect error on %s:%s: %s.%s: %s",
self._named_service, self.__dbus_object_path__,
error.__class__.__module__, error.__class__.__name__,
error)
self._introspect_lock.acquire()
try:
_logger.debug('Executing introspect queue due to error')
self._introspect_state = self.INTROSPECT_STATE_DONT_INTROSPECT
self._pending_introspect = None
self._introspect_execute_queue()
finally:
self._introspect_lock.release()
def _introspect_block(self):
self._introspect_lock.acquire()
try:
if self._pending_introspect is not None:
self._pending_introspect.block()
# else someone still has a _DeferredMethod from before we
# finished introspection: no need to do anything special any more
finally:
self._introspect_lock.release()
def _introspect_add_to_queue(self, callback, args, kwargs):
self._introspect_lock.acquire()
try:
if self._introspect_state == self.INTROSPECT_STATE_INTROSPECT_IN_PROGRESS:
self._pending_introspect_queue.append((callback, args, kwargs))
else:
# someone still has a _DeferredMethod from before we
# finished introspection
callback(*args, **kwargs)
finally:
self._introspect_lock.release()
def __getattr__(self, member):
if member.startswith('__') and member.endswith('__'):
raise AttributeError(member)
else:
return self.get_dbus_method(member)
def get_dbus_method(self, member, dbus_interface=None):
"""Return a proxy method representing the given D-Bus method. The
returned proxy method can be called in the usual way. For instance, ::
proxy.get_dbus_method("Foo", dbus_interface='com.example.Bar')(123)
is equivalent to::
proxy.Foo(123, dbus_interface='com.example.Bar')
or even::
getattr(proxy, "Foo")(123, dbus_interface='com.example.Bar')
However, using `get_dbus_method` is the only way to call D-Bus
methods with certain awkward names - if the author of a service
implements a method called ``connect_to_signal`` or even
``__getattr__``, you'll need to use `get_dbus_method` to call them.
For services which follow the D-Bus convention of CamelCaseMethodNames
this won't be a problem.
"""
ret = self.ProxyMethodClass(self, self._bus,
self._named_service,
self.__dbus_object_path__, member,
dbus_interface)
# this can be done without taking the lock - the worst that can
# happen is that we accidentally return a _DeferredMethod just after
# finishing introspection, in which case _introspect_add_to_queue and
# _introspect_block will do the right thing anyway
if self._introspect_state == self.INTROSPECT_STATE_INTROSPECT_IN_PROGRESS:
ret = self.DeferredMethodClass(ret, self._introspect_add_to_queue,
self._introspect_block)
return ret
def __repr__(self):
return '<ProxyObject wrapping %s %s %s at %#x>'%(
self._bus, self._named_service, self.__dbus_object_path__, id(self))
__str__ = __repr__
class Interface(object):
"""An interface into a remote object.
An Interface can be used to wrap ProxyObjects
so that calls can be routed to their correct
D-Bus interface.
"""
def __init__(self, object, dbus_interface):
"""Construct a proxy for the given interface on the given object.
:Parameters:
`object` : `dbus.proxies.ProxyObject` or `dbus.Interface`
The remote object or another of its interfaces
`dbus_interface` : str
An interface the `object` implements
"""
if isinstance(object, Interface):
self._obj = object.proxy_object
else:
self._obj = object
self._dbus_interface = dbus_interface
object_path = property (lambda self: self._obj.object_path, None, None,
"The D-Bus object path of the underlying object")
__dbus_object_path__ = object_path
bus_name = property (lambda self: self._obj.bus_name, None, None,
"The bus name to which the underlying proxy object "
"is bound")
requested_bus_name = property (lambda self: self._obj.requested_bus_name,
None, None,
"The bus name which was requested when the "
"underlying object was created")
proxy_object = property (lambda self: self._obj, None, None,
"""The underlying proxy object""")
dbus_interface = property (lambda self: self._dbus_interface, None, None,
"""The D-Bus interface represented""")
def connect_to_signal(self, signal_name, handler_function,
dbus_interface=None, **keywords):
"""Arrange for a function to be called when the given signal is
emitted.
The parameters and keyword arguments are the same as for
`dbus.proxies.ProxyObject.connect_to_signal`, except that if
`dbus_interface` is None (the default), the D-Bus interface that
was passed to the `Interface` constructor is used.
"""
if not dbus_interface:
dbus_interface = self._dbus_interface
return self._obj.connect_to_signal(signal_name, handler_function,
dbus_interface, **keywords)
def __getattr__(self, member):
if member.startswith('__') and member.endswith('__'):
raise AttributeError(member)
else:
return self._obj.get_dbus_method(member, self._dbus_interface)
def get_dbus_method(self, member, dbus_interface=None):
"""Return a proxy method representing the given D-Bus method.
This is the same as `dbus.proxies.ProxyObject.get_dbus_method`
except that if `dbus_interface` is None (the default),
the D-Bus interface that was passed to the `Interface` constructor
is used.
"""
if dbus_interface is None:
dbus_interface = self._dbus_interface
return self._obj.get_dbus_method(member, dbus_interface)
def __repr__(self):
return '<Interface %r implementing %r at %#x>'%(
self._obj, self._dbus_interface, id(self))
__str__ = __repr__
|