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import dbus_bindings
import _dbus
from exceptions import UnknownMethodException
class BusName:
"""A base class for exporting your own Named Services across the Bus
"""
def __init__(self, named_service, bus=None):
self._named_service = named_service
if bus == None:
# Get the default bus
self._bus = _dbus.Bus()
else:
self._bus = bus
dbus_bindings.bus_request_name(self._bus.get_connection(), named_service)
def get_bus(self):
"""Get the Bus this Service is on"""
return self._bus
def get_name(self):
"""Get the name of this service"""
return self._named_service
def _dispatch_dbus_method_call(target_methods, self, argument_list, message):
"""Calls method_to_call using argument_list, but handles
exceptions, etc, and generates a reply to the DBus Message message
"""
try:
target_method = None
dbus_interface = message.get_interface()
if dbus_interface == None:
if target_methods:
target_method = target_methods[0]
else:
for dbus_method in target_methods:
if dbus_method._dbus_interface == dbus_interface:
target_method = dbus_method
break
if target_method:
retval = target_method(self, *argument_list)
else:
if not dbus_interface:
raise UnknownMethodException('%s is not a valid method'%(message.get_member()))
else:
raise UnknownMethodException('%s is not a valid method of interface %s'%(message.get_member(), dbus_interface))
except Exception, e:
if e.__module__ == '__main__':
# FIXME: is it right to use .__name__ here?
error_name = e.__class__.__name__
else:
error_name = e.__module__ + '.' + str(e.__class__.__name__)
error_contents = str(e)
reply = dbus_bindings.Error(message, error_name, error_contents)
else:
reply = dbus_bindings.MethodReturn(message)
if retval != None:
iter = reply.get_iter(append=True)
iter.append(retval)
return reply
class ObjectType(type):
def __init__(cls, name, bases, dct):
#generate out vtable
method_vtable = getattr(cls, '_dbus_method_vtable', {})
reflection_data = getattr(cls, '_dbus_reflection_data', "")
reflection_interface_method_hash = {}
reflection_interface_signal_hash = {}
for func in dct.values():
if getattr(func, '_dbus_is_method', False):
if method_vtable.has_key(func.__name__):
method_vtable[func.__name__].append(func)
else:
method_vtable[func.__name__] = [func]
#generate a hash of interfaces so we can group
#methods in the xml data
if reflection_interface_method_hash.has_key(func._dbus_interface):
reflection_interface_method_hash[func._dbus_interface].append(func)
else:
reflection_interface_method_hash[func._dbus_interface] = [func]
elif getattr(func, '_dbus_is_signal', False):
if reflection_interface_signal_hash.has_key(func._dbus_interface):
reflection_interface_signal_hash[func._dbus_interface].append(func)
else:
reflection_interface_signal_hash[func._dbus_interface] = [func]
for interface in reflection_interface_method_hash.keys():
reflection_data = reflection_data + ' <interface name="%s">\n'%(interface)
for func in reflection_interface_method_hash[interface]:
reflection_data = reflection_data + cls._reflect_on_method(func)
if reflection_interface_signal_hash.has_key(interface):
for func in reflection_interface_signal_hash[interface]:
reflection_data = reflection_data + cls._reflect_on_signal(func)
del reflection_interface_signal_hash[interface]
reflection_data = reflection_data + ' </interface>\n'
for interface in reflection_interface_signal_hash.keys():
reflection_data = reflection_data + ' <interface name="%s">\n'%(interface)
for func in reflection_interface_signal_hash[interface]:
reflection_data = reflection_data + cls._reflect_on_signal(func)
reflection_data = reflection_data + ' </interface>\n'
cls._dbus_reflection_data = reflection_data
cls._dbus_method_vtable = method_vtable
super(ObjectType, cls).__init__(name, bases, dct)
#reflections on methods and signals may look like similar code but may in fact
#diverge in the future so keep them seperate
def _reflect_on_method(cls, func):
reflection_data = ' <method name="%s">\n'%(func.__name__)
for arg in func._dbus_args:
reflection_data = reflection_data + ' <arg name="%s" type="v" />\n'%(arg)
#reclaim some memory
func._dbus_args = None
reflection_data = reflection_data + ' </method>\n'
return reflection_data
def _reflect_on_signal(cls, func):
reflection_data = ' <signal name="%s">\n'%(func.__name__)
for arg in func._dbus_args:
reflection_data = reflection_data + ' <arg name="%s" type="v" />\n'%(arg)
#reclaim some memory
func._dbus_args = None
reflection_data = reflection_data + ' </signal>\n'
return reflection_data
class Object:
"""A base class for exporting your own Objects across the Bus.
Just inherit from Object and provide a list of methods to share
across the Bus
"""
__metaclass__ = ObjectType
def __init__(self, bus_name, object_path):
self._object_path = object_path
self._name = bus_name
self._bus = bus_name.get_bus()
self._connection = self._bus.get_connection()
self._connection.register_object_path(object_path, self._unregister_cb, self._message_cb)
def _unregister_cb(self, connection):
print ("Unregister")
def _message_cb(self, connection, message):
target_method_name = message.get_member()
target_methods = self._dbus_method_vtable[target_method_name]
args = message.get_args_list()
reply = _dispatch_dbus_method_call(target_methods, self, args, message)
self._connection.send(reply)
@method('org.freedesktop.DBus.Introspectable')
def Introspect(self):
reflection_data = '<!DOCTYPE node PUBLIC "-//freedesktop//DTD D-BUS Object Introspection 1.0//EN" "http://www.freedesktop.org/standards/dbus/1.0/introspect.dtd">\n'
reflection_data = reflection_data + '<node name="%s">\n'%(self._object_path)
reflection_data = reflection_data + self._dbus_reflection_data
reflection_data = reflection_data + '</node>\n'
return reflection_data
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