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connection.py
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# Copyright (C) 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. __all__ = ('Connection', 'SignalMatch') __docformat__ = 'reStructuredText' import logging import threading import weakref from _dbus_bindings import ( Connection as _Connection, LOCAL_IFACE, LOCAL_PATH, validate_bus_name, validate_interface_name, validate_member_name, validate_object_path) from dbus.exceptions import DBusException from dbus.lowlevel import ( ErrorMessage, HANDLER_RESULT_NOT_YET_HANDLED, MethodCallMessage, MethodReturnMessage, SignalMessage) from dbus.proxies import ProxyObject from dbus._compat import is_py2, is_py3 if is_py3: from _dbus_bindings import String else: from _dbus_bindings import UTF8String _logger = logging.getLogger('dbus.connection') def _noop(*args, **kwargs): pass class SignalMatch(object): _slots = ['_sender_name_owner', '_member', '_interface', '_sender', '_path', '_handler', '_args_match', '_rule', '_byte_arrays', '_conn_weakref', '_destination_keyword', '_interface_keyword', '_message_keyword', '_member_keyword', '_sender_keyword', '_path_keyword', '_int_args_match'] if is_py2: _slots.append('_utf8_strings') __slots__ = tuple(_slots) def __init__(self, conn, sender, object_path, dbus_interface, member, handler, byte_arrays=False, sender_keyword=None, path_keyword=None, interface_keyword=None, member_keyword=None, message_keyword=None, destination_keyword=None, **kwargs): if member is not None: validate_member_name(member) if dbus_interface is not None: validate_interface_name(dbus_interface) if sender is not None: validate_bus_name(sender) if object_path is not None: validate_object_path(object_path) self._rule = None self._conn_weakref = weakref.ref(conn) self._sender = sender self._interface = dbus_interface self._member = member self._path = object_path self._handler = handler # if the connection is actually a bus, it's responsible for changing # this later self._sender_name_owner = sender if is_py2: self._utf8_strings = kwargs.pop('utf8_strings', False) elif 'utf8_strings' in kwargs: raise TypeError("unexpected keyword argument 'utf8_strings'") self._byte_arrays = byte_arrays self._sender_keyword = sender_keyword self._path_keyword = path_keyword self._member_keyword = member_keyword self._interface_keyword = interface_keyword self._message_keyword = message_keyword self._destination_keyword = destination_keyword self._args_match = kwargs if not kwargs: self._int_args_match = None else: self._int_args_match = {} for kwarg in kwargs: if not kwarg.startswith('arg'): raise TypeError('SignalMatch: unknown keyword argument %s' % kwarg) try: index = int(kwarg[3:]) except ValueError: raise TypeError('SignalMatch: unknown keyword argument %s' % kwarg) if index < 0 or index > 63: raise TypeError('SignalMatch: arg match index must be in ' 'range(64), not %d' % index) self._int_args_match[index] = kwargs[kwarg] def __hash__(self): """SignalMatch objects are compared by identity.""" return hash(id(self)) def __eq__(self, other): """SignalMatch objects are compared by identity.""" return self is other def __ne__(self, other): """SignalMatch objects are compared by identity.""" return self is not other sender = property(lambda self: self._sender) def __str__(self): if self._rule is None: rule = ["type='signal'"] if self._sender is not None: rule.append("sender='%s'" % self._sender) if self._path is not None: rule.append("path='%s'" % self._path) if self._interface is not None: rule.append("interface='%s'" % self._interface) if self._member is not None: rule.append("member='%s'" % self._member) if self._int_args_match is not None: for index, value in self._int_args_match.items(): rule.append("arg%d='%s'" % (index, value)) self._rule = ','.join(rule) return self._rule def __repr__(self): return ('<%s at %x "%s" on conn %r>' % (self.__class__, id(self), self._rule, self._conn_weakref())) def set_sender_name_owner(self, new_name): self._sender_name_owner = new_name def matches_removal_spec(self, sender, object_path, dbus_interface, member, handler, **kwargs): if handler not in (None, self._handler): return False if sender != self._sender: return False if object_path != self._path: return False if dbus_interface != self._interface: return False if member != self._member: return False if kwargs != self._args_match: return False return True def maybe_handle_message(self, message): args = None # these haven't been checked yet by the match tree if self._sender_name_owner not in (None, message.get_sender()): return False if self._int_args_match is not None: # extracting args with utf8_strings and byte_arrays is less work kwargs = dict(byte_arrays=True) arg_type = (String if is_py3 else UTF8String) if is_py2: kwargs['utf8_strings'] = True args = message.get_args_list(**kwargs) for index, value in self._int_args_match.items(): if (index >= len(args) or not isinstance(args[index], arg_type) or args[index] != value): return False # these have likely already been checked by the match tree if self._member not in (None, message.get_member()): return False if self._interface not in (None, message.get_interface()): return False if self._path not in (None, message.get_path()): return False try: # minor optimization: if we already extracted the args with the # right calling convention to do the args match, don't bother # doing so again utf8_strings = (is_py2 and self._utf8_strings) if args is None or not utf8_strings or not self._byte_arrays: kwargs = dict(byte_arrays=self._byte_arrays) if is_py2: kwargs['utf8_strings'] = self._utf8_strings args = message.get_args_list(**kwargs) kwargs = {} if self._sender_keyword is not None: kwargs[self._sender_keyword] = message.get_sender() if self._destination_keyword is not None: kwargs[self._destination_keyword] = message.get_destination() if self._path_keyword is not None: kwargs[self._path_keyword] = message.get_path() if self._member_keyword is not None: kwargs[self._member_keyword] = message.get_member() if self._interface_keyword is not None: kwargs[self._interface_keyword] = message.get_interface() if self._message_keyword is not None: kwargs[self._message_keyword] = message self._handler(*args, **kwargs) except: # basicConfig is a no-op if logging is already configured logging.basicConfig() _logger.error('Exception in handler for D-Bus signal:', exc_info=1) return True def remove(self): conn = self._conn_weakref() # do nothing if the connection has already vanished if conn is not None: conn.remove_signal_receiver(self, self._member, self._interface, self._sender, self._path, **self._args_match) class Connection(_Connection): """A connection to another application. In this base class there is assumed to be no bus daemon. :Since: 0.81.0 """ ProxyObjectClass = ProxyObject def __init__(self, *args, **kwargs): super(Connection, self).__init__(*args, **kwargs) # this if-block is needed because shared bus connections can be # __init__'ed more than once if not hasattr(self, '_dbus_Connection_initialized'): self._dbus_Connection_initialized = 1 self.__call_on_disconnection = [] self._signal_recipients_by_object_path = {} """Map from object path to dict mapping dbus_interface to dict mapping member to list of SignalMatch objects.""" self._signals_lock = threading.Lock() """Lock used to protect signal data structures""" self.add_message_filter(self.__class__._signal_func) def activate_name_owner(self, bus_name): """Return the unique name for the given bus name, activating it if necessary and possible. If the name is already unique or this connection is not to a bus daemon, just return it. :Returns: a bus name. If the given `bus_name` exists, the returned name identifies its current owner; otherwise the returned name does not exist. :Raises DBusException: if the implementation has failed to activate the given bus name. :Since: 0.81.0 """ return bus_name def get_object(self, bus_name=None, object_path=None, introspect=True, **kwargs): """Return a local proxy for the given remote object. Method calls on the proxy are translated into method calls on the remote object. :Parameters: `bus_name` : str A bus name (either the unique name or a well-known name) of the application owning the object. The keyword argument named_service is a deprecated alias for this. `object_path` : str The object path of the desired object `introspect` : bool If true (default), attempt to introspect the remote object to find out supported methods and their signatures :Returns: a `dbus.proxies.ProxyObject` """ 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') from warnings import warn warn('Passing the named_service parameter to get_object by name ' 'is deprecated: please use positional parameters', DeprecationWarning, stacklevel=2) bus_name = named_service if kwargs: raise TypeError('get_object does not take these keyword ' 'arguments: %s' % ', '.join(kwargs.keys())) return self.ProxyObjectClass(self, bus_name, object_path, introspect=introspect) def add_signal_receiver(self, handler_function, signal_name=None, dbus_interface=None, bus_name=None, path=None, **keywords): """Arrange for the given function to be called when a signal matching the parameters is received. :Parameters: `handler_function` : callable The function to be called. Its positional arguments will be the arguments of the signal. By default it will receive no keyword arguments, but see the description of the optional keyword arguments below. `signal_name` : str The signal name; None (the default) matches all names `dbus_interface` : str The D-Bus interface name with which to qualify the signal; None (the default) matches all interface names `bus_name` : str A bus name for the sender, which will be resolved to a unique name if it is not already; None (the default) matches any sender. `path` : str The object path of the object which must have emitted the signal; None (the default) matches any object path :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). `named_service` : str A deprecated alias for `bus_name`. """ self._require_main_loop() named_service = keywords.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 add_signal_receiver ' 'by name is deprecated: please use positional parameters', DeprecationWarning, stacklevel=2) match = SignalMatch(self, bus_name, path, dbus_interface, signal_name, handler_function, **keywords) self._signals_lock.acquire() try: by_interface = self._signal_recipients_by_object_path.setdefault( path, {}) by_member = by_interface.setdefault(dbus_interface, {}) matches = by_member.setdefault(signal_name, []) matches.append(match) finally: self._signals_lock.release() return match def _iter_easy_matches(self, path, dbus_interface, member): if path is not None: path_keys = (None, path) else: path_keys = (None,) if dbus_interface is not None: interface_keys = (None, dbus_interface) else: interface_keys = (None,) if member is not None: member_keys = (None, member) else: member_keys = (None,) for path in path_keys: by_interface = self._signal_recipients_by_object_path.get(path) if by_interface is None: continue for dbus_interface in interface_keys: by_member = by_interface.get(dbus_interface, None) if by_member is None: continue for member in member_keys: matches = by_member.get(member, None) if matches is None: continue for m in matches: yield m def remove_signal_receiver(self, handler_or_match, signal_name=None, dbus_interface=None, bus_name=None, path=None, **keywords): named_service = keywords.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 ' 'remove_signal_receiver by name is deprecated: please use ' 'positional parameters', DeprecationWarning, stacklevel=2) new = [] deletions = [] self._signals_lock.acquire() try: by_interface = self._signal_recipients_by_object_path.get(path, None) if by_interface is None: return by_member = by_interface.get(dbus_interface, None) if by_member is None: return matches = by_member.get(signal_name, None) if matches is None: return for match in matches: if (handler_or_match is match or match.matches_removal_spec(bus_name, path, dbus_interface, signal_name, handler_or_match, **keywords)): deletions.append(match) else: new.append(match) if new: by_member[signal_name] = new else: del by_member[signal_name] if not by_member: del by_interface[dbus_interface] if not by_interface: del self._signal_recipients_by_object_path[path] finally: self._signals_lock.release() for match in deletions: self._clean_up_signal_match(match) def _clean_up_signal_match(self, match): # Now called without the signals lock held (it was held in <= 0.81.0) pass def _signal_func(self, message): """D-Bus filter function. Handle signals by dispatching to Python callbacks kept in the match-rule tree. """ if not isinstance(message, SignalMessage): return HANDLER_RESULT_NOT_YET_HANDLED dbus_interface = message.get_interface() path = message.get_path() signal_name = message.get_member() for match in self._iter_easy_matches(path, dbus_interface, signal_name): match.maybe_handle_message(message) if (dbus_interface == LOCAL_IFACE and path == LOCAL_PATH and signal_name == 'Disconnected'): for cb in self.__call_on_disconnection: try: cb(self) except Exception: # basicConfig is a no-op if logging is already configured logging.basicConfig() _logger.error('Exception in handler for Disconnected ' 'signal:', exc_info=1) return HANDLER_RESULT_NOT_YET_HANDLED def call_async(self, bus_name, object_path, dbus_interface, method, signature, args, reply_handler, error_handler, timeout=-1.0, byte_arrays=False, require_main_loop=True, **kwargs): """Call the given method, asynchronously. If the reply_handler is None, successful replies will be ignored. If the error_handler is None, failures will be ignored. If both are None, the implementation may request that no reply is sent. :Returns: The dbus.lowlevel.PendingCall. :Since: 0.81.0 """ if object_path == LOCAL_PATH: raise DBusException('Methods may not be called on the reserved ' 'path %s' % LOCAL_PATH) if dbus_interface == LOCAL_IFACE: raise DBusException('Methods may not be called on the reserved ' 'interface %s' % LOCAL_IFACE) # no need to validate other args - MethodCallMessage ctor will do get_args_opts = dict(byte_arrays=byte_arrays) if is_py2: get_args_opts['utf8_strings'] = kwargs.get('utf8_strings', False) elif 'utf8_strings' in kwargs: raise TypeError("unexpected keyword argument 'utf8_strings'") message = MethodCallMessage(destination=bus_name, path=object_path, interface=dbus_interface, method=method) # Add the arguments to the function try: message.append(signature=signature, *args) except Exception as e: logging.basicConfig() _logger.error('Unable to set arguments %r according to ' 'signature %r: %s: %s', args, signature, e.__class__, e) raise if reply_handler is None and error_handler is None: # we don't care what happens, so just send it self.send_message(message) return if reply_handler is None: reply_handler = _noop if error_handler is None: error_handler = _noop def msg_reply_handler(message): if isinstance(message, MethodReturnMessage): reply_handler(*message.get_args_list(**get_args_opts)) elif isinstance(message, ErrorMessage): error_handler(DBusException(name=message.get_error_name(), *message.get_args_list())) else: error_handler(TypeError('Unexpected type for reply ' 'message: %r' % message)) return self.send_message_with_reply(message, msg_reply_handler, timeout, require_main_loop=require_main_loop) def call_blocking(self, bus_name, object_path, dbus_interface, method, signature, args, timeout=-1.0, byte_arrays=False, **kwargs): """Call the given method, synchronously. :Since: 0.81.0 """ if object_path == LOCAL_PATH: raise DBusException('Methods may not be called on the reserved ' 'path %s' % LOCAL_PATH) if dbus_interface == LOCAL_IFACE: raise DBusException('Methods may not be called on the reserved ' 'interface %s' % LOCAL_IFACE) # no need to validate other args - MethodCallMessage ctor will do get_args_opts = dict(byte_arrays=byte_arrays) if is_py2: get_args_opts['utf8_strings'] = kwargs.get('utf8_strings', False) elif 'utf8_strings' in kwargs: raise TypeError("unexpected keyword argument 'utf8_strings'") message = MethodCallMessage(destination=bus_name, path=object_path, interface=dbus_interface, method=method) # Add the arguments to the function try: message.append(signature=signature, *args) except Exception as e: logging.basicConfig() _logger.error('Unable to set arguments %r according to ' 'signature %r: %s: %s', args, signature, e.__class__, e) raise # make a blocking call reply_message = self.send_message_with_reply_and_block( message, timeout) args_list = reply_message.get_args_list(**get_args_opts) if len(args_list) == 0: return None elif len(args_list) == 1: return args_list[0] else: return tuple(args_list) def call_on_disconnection(self, callable): """Arrange for `callable` to be called with one argument (this Connection object) when the Connection becomes disconnected. :Since: 0.83.0 """ self.__call_on_disconnection.append(callable)