/usr/share/pyshared/cream/ipc/hacks.py is in python-cream 0.5.3-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 | # Copyright: 2007-2013, Sebastian Billaudelle <sbillaudelle@googlemail.com>
# 2010-2013, Kristoffer Kleine <kris.kleine@yahoo.de>
# This library is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation; either version 2.1 of the License, or
# (at your option) any later version.
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU Lesser General Public License for more details.
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
import dbus
import dbus.service
def add_method(cls, func, *args, **kwargs):
"""
add a method to the dbus.service.Object subclass *cls*.
*func* is the function (don't forget the `self` argument),
all further arguments are passed verbatim to the
`dbus.service.method` decorator function.
This function will add *func* as an attribute to *cls*.
"""
func = dbus.service.method(*args, **kwargs)(func)
name = func.__name__
# some dirty magic follows.
# patch together some "qualificated" class name.
# It consists of the module and the class name.
clsname = '.'.join((cls.__module__, cls.__name__))
# dbus-python uses a magic `_dbus_class_table` class attribute
# for storing the methods. It contains some nested dictionaries.
# The keys are the class names, and the values are dictionaries
# mapping interface names to dictionaries that map method names
# to Python functions. Wow.
# So, we add the new method to the class table here.
entry = cls._dbus_class_table.setdefault(clsname, {})
# We just steal the name of the interface from the function.
# `dbus.service.method` added it for us.
entry.setdefault(func._dbus_interface, {})[name] = func
# Finally we set it as an attribute.
setattr(cls, name, func)
def create_signal_emitter(name, signature, interface, argnames):
f = lambda *args: None
f.__name__ = name
f._dbus_is_signal = True
f._dbus_interface = interface
f._dbus_signature = signature
f._dbus_args = argnames
return f
def add_signal(cls, name, signature, interface):
"""
adds a signal named *name* with the signature *signature*
to the dbus class *cls*.
If you call the signal emitter, nothing will happen. You
have to do that yourself.
"""
# get the argcount from the signature
signal_argcount = len(list(dbus.Signature(signature))) # len(dbus.Signature(...)) gives strange results
argnames = ['arg%d' % i for i in xrange(signal_argcount + 1)]
func = create_signal_emitter(name, signature, interface, argnames)
# now, essentially the same dirty magic as in `add_function`
# is done. See above for explanation.
clsname = '.'.join((cls.__module__, cls.__name__))
entry = cls._dbus_class_table.setdefault(clsname, {})
entry.setdefault(func._dbus_interface, {})[name] = func
setattr(cls, name, func)
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