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651
lib/dbus/connection.py
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651
lib/dbus/connection.py
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# Copyright (C) 2007 Collabora Ltd. <http://www.collabora.co.uk/>
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#
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# SPDX-License-Identifier: MIT
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#
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# Permission is hereby granted, free of charge, to any person
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# obtaining a copy of this software and associated documentation
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# files (the "Software"), to deal in the Software without
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# restriction, including without limitation the rights to use, copy,
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# modify, merge, publish, distribute, sublicense, and/or sell copies
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# of the Software, and to permit persons to whom the Software is
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# furnished to do so, subject to the following conditions:
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#
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# The above copyright notice and this permission notice shall be
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# included in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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# DEALINGS IN THE SOFTWARE.
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__all__ = ('Connection', 'SignalMatch')
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__docformat__ = 'reStructuredText'
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import logging
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import threading
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import weakref
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from _dbus_bindings import (
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Connection as _Connection, LOCAL_IFACE, LOCAL_PATH, validate_bus_name,
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validate_interface_name, validate_member_name, validate_object_path)
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from dbus.exceptions import DBusException
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from dbus.lowlevel import (
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ErrorMessage, HANDLER_RESULT_NOT_YET_HANDLED, MethodCallMessage,
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MethodReturnMessage, SignalMessage)
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from dbus.proxies import ProxyObject
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from dbus._compat import is_py2, is_py3
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from _dbus_bindings import String
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_logger = logging.getLogger('dbus.connection')
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def _noop(*args, **kwargs):
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pass
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class SignalMatch(object):
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_slots = ['_sender_name_owner', '_member', '_interface', '_sender',
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'_path', '_handler', '_args_match', '_rule',
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'_byte_arrays', '_conn_weakref',
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'_destination_keyword', '_interface_keyword',
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'_message_keyword', '_member_keyword',
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'_sender_keyword', '_path_keyword', '_int_args_match']
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__slots__ = tuple(_slots)
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def __init__(self, conn, sender, object_path, dbus_interface,
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member, handler, byte_arrays=False,
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sender_keyword=None, path_keyword=None,
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interface_keyword=None, member_keyword=None,
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message_keyword=None, destination_keyword=None,
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**kwargs):
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if member is not None:
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validate_member_name(member)
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if dbus_interface is not None:
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validate_interface_name(dbus_interface)
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if sender is not None:
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validate_bus_name(sender)
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if object_path is not None:
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validate_object_path(object_path)
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self._rule = None
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self._conn_weakref = weakref.ref(conn)
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self._sender = sender
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self._interface = dbus_interface
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self._member = member
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self._path = object_path
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self._handler = handler
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# if the connection is actually a bus, it's responsible for changing
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# this later
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self._sender_name_owner = sender
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if 'utf8_strings' in kwargs:
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raise TypeError("unexpected keyword argument 'utf8_strings'")
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self._byte_arrays = byte_arrays
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self._sender_keyword = sender_keyword
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self._path_keyword = path_keyword
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self._member_keyword = member_keyword
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self._interface_keyword = interface_keyword
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self._message_keyword = message_keyword
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self._destination_keyword = destination_keyword
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self._args_match = kwargs
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if not kwargs:
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self._int_args_match = None
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else:
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self._int_args_match = {}
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for kwarg in kwargs:
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if not kwarg.startswith('arg'):
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raise TypeError('SignalMatch: unknown keyword argument %s'
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% kwarg)
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try:
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index = int(kwarg[3:])
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except ValueError:
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raise TypeError('SignalMatch: unknown keyword argument %s'
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% kwarg)
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if index < 0 or index > 63:
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raise TypeError('SignalMatch: arg match index must be in '
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'range(64), not %d' % index)
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self._int_args_match[index] = kwargs[kwarg]
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def __hash__(self):
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"""SignalMatch objects are compared by identity."""
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return hash(id(self))
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def __eq__(self, other):
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"""SignalMatch objects are compared by identity."""
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return self is other
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def __ne__(self, other):
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"""SignalMatch objects are compared by identity."""
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return self is not other
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sender = property(lambda self: self._sender)
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def __str__(self):
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if self._rule is None:
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rule = ["type='signal'"]
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if self._sender is not None:
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rule.append("sender='%s'" % self._sender)
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if self._path is not None:
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rule.append("path='%s'" % self._path)
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if self._interface is not None:
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rule.append("interface='%s'" % self._interface)
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if self._member is not None:
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rule.append("member='%s'" % self._member)
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if self._int_args_match is not None:
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for index, value in self._int_args_match.items():
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rule.append("arg%d='%s'" % (index, value))
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self._rule = ','.join(rule)
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return self._rule
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def __repr__(self):
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return ('<%s at %x "%s" on conn %r>'
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% (self.__class__, id(self), self._rule, self._conn_weakref()))
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def set_sender_name_owner(self, new_name):
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self._sender_name_owner = new_name
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def matches_removal_spec(self, sender, object_path,
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dbus_interface, member, handler, **kwargs):
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if handler not in (None, self._handler):
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return False
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if sender != self._sender:
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return False
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if object_path != self._path:
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return False
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if dbus_interface != self._interface:
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return False
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if member != self._member:
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return False
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if kwargs != self._args_match:
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return False
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return True
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def maybe_handle_message(self, message):
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args = None
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# these haven't been checked yet by the match tree
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if self._sender_name_owner not in (None, message.get_sender()):
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return False
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if self._int_args_match is not None:
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# extracting args with byte_arrays is less work
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kwargs = dict(byte_arrays=True)
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args = message.get_args_list(**kwargs)
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for index, value in self._int_args_match.items():
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if (index >= len(args)
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or not isinstance(args[index], String)
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or args[index] != value):
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return False
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# these have likely already been checked by the match tree
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if self._member not in (None, message.get_member()):
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return False
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if self._interface not in (None, message.get_interface()):
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return False
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if self._path not in (None, message.get_path()):
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return False
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try:
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# minor optimization: if we already extracted the args with the
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# right calling convention to do the args match, don't bother
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# doing so again
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if args is None or not self._byte_arrays:
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args = message.get_args_list(byte_arrays=self._byte_arrays)
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kwargs = {}
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if self._sender_keyword is not None:
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kwargs[self._sender_keyword] = message.get_sender()
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if self._destination_keyword is not None:
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kwargs[self._destination_keyword] = message.get_destination()
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if self._path_keyword is not None:
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kwargs[self._path_keyword] = message.get_path()
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if self._member_keyword is not None:
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kwargs[self._member_keyword] = message.get_member()
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if self._interface_keyword is not None:
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kwargs[self._interface_keyword] = message.get_interface()
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if self._message_keyword is not None:
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kwargs[self._message_keyword] = message
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self._handler(*args, **kwargs)
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except:
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# basicConfig is a no-op if logging is already configured
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logging.basicConfig()
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_logger.error('Exception in handler for D-Bus signal:', exc_info=1)
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return True
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def remove(self):
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conn = self._conn_weakref()
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# do nothing if the connection has already vanished
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if conn is not None:
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conn.remove_signal_receiver(self, self._member,
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self._interface, self._sender,
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self._path,
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**self._args_match)
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class Connection(_Connection):
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"""A connection to another application. In this base class there is
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assumed to be no bus daemon.
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:Since: 0.81.0
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"""
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ProxyObjectClass = ProxyObject
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def __init__(self, *args, **kwargs):
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super(Connection, self).__init__(*args, **kwargs)
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# this if-block is needed because shared bus connections can be
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# __init__'ed more than once
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if not hasattr(self, '_dbus_Connection_initialized'):
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self._dbus_Connection_initialized = 1
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self.__call_on_disconnection = []
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self._signal_recipients_by_object_path = {}
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"""Map from object path to dict mapping dbus_interface to dict
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mapping member to list of SignalMatch objects."""
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self._signals_lock = threading.Lock()
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"""Lock used to protect signal data structures"""
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self.add_message_filter(self.__class__._signal_func)
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def activate_name_owner(self, bus_name):
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"""Return the unique name for the given bus name, activating it
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if necessary and possible.
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If the name is already unique or this connection is not to a
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bus daemon, just return it.
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:Returns: a bus name. If the given `bus_name` exists, the returned
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name identifies its current owner; otherwise the returned name
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does not exist.
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:Raises DBusException: if the implementation has failed
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to activate the given bus name.
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:Since: 0.81.0
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"""
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return bus_name
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def get_object(self, bus_name=None, object_path=None, introspect=True,
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**kwargs):
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"""Return a local proxy for the given remote object.
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Method calls on the proxy are translated into method calls on the
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remote object.
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:Parameters:
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`bus_name` : str
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A bus name (either the unique name or a well-known name)
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of the application owning the object. The keyword argument
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named_service is a deprecated alias for this.
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`object_path` : str
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The object path of the desired object
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`introspect` : bool
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If true (default), attempt to introspect the remote
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object to find out supported methods and their signatures
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:Returns: a `dbus.proxies.ProxyObject`
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"""
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named_service = kwargs.pop('named_service', None)
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if named_service is not None:
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if bus_name is not None:
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raise TypeError('bus_name and named_service cannot both '
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'be specified')
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from warnings import warn
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warn('Passing the named_service parameter to get_object by name '
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'is deprecated: please use positional parameters',
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DeprecationWarning, stacklevel=2)
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bus_name = named_service
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if kwargs:
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raise TypeError('get_object does not take these keyword '
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'arguments: %s' % ', '.join(kwargs.keys()))
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return self.ProxyObjectClass(self, bus_name, object_path,
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introspect=introspect)
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def add_signal_receiver(self, handler_function,
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signal_name=None,
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dbus_interface=None,
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bus_name=None,
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path=None,
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**keywords):
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"""Arrange for the given function to be called when a signal matching
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the parameters is received.
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:Parameters:
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`handler_function` : callable
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The function to be called. Its positional arguments will
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be the arguments of the signal. By default it will receive
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no keyword arguments, but see the description of
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the optional keyword arguments below.
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`signal_name` : str
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The signal name; None (the default) matches all names
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`dbus_interface` : str
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The D-Bus interface name with which to qualify the signal;
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None (the default) matches all interface names
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`bus_name` : str
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A bus name for the sender, which will be resolved to a
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unique name if it is not already; None (the default) matches
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any sender.
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`path` : str
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The object path of the object which must have emitted the
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signal; None (the default) matches any object path
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:Keywords:
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`utf8_strings` : bool
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If True, the handler function will receive any string
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arguments as dbus.UTF8String objects (a subclass of str
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guaranteed to be UTF-8). If False (default) it will receive
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any string arguments as dbus.String objects (a subclass of
|
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unicode).
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`byte_arrays` : bool
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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
|
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If not None (the default), the handler function will receive
|
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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
|
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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).
|
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`named_service` : str
|
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A deprecated alias for `bus_name`.
|
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"""
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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 '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 '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)
|
||||
Reference in New Issue
Block a user