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Edit File : proxies.py \| Size : 24.21 KB
# 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__ Back

Edit File : proxies.py | Size : 24.21 KB

# 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__

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