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#!/usr/bin/env python
# Contributors Listed Below - COPYRIGHT 2015
# [+] International Business Machines Corp.
#
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
# implied. See the License for the specific language governing
# permissions and limitations under the License.
import dbus
import dbus.service
import dbus.exceptions
import dbus.mainloop.glib
import gobject
from OpenBMCMapper import IntrospectionParser, PathTree
import OpenBMCMapper
class MapperNotFoundException(dbus.exceptions.DBusException):
_dbus_error_name = OpenBMCMapper.MAPPER_NOT_FOUND
def __init__(self, path):
super(MapperNotFoundException, self).__init__(
"path or object not found: %s" %(path))
class ObjectMapper(dbus.service.Object):
def __init__(self, bus, path,
name_match = OpenBMCMapper.org_dot_openbmc_match,
intf_match = OpenBMCMapper.org_dot_openbmc_match):
super(ObjectMapper, self).__init__(bus.dbus, path)
self.cache = PathTree()
self.bus = bus
self.name_match = name_match
self.intf_match = intf_match
self.tag_match = OpenBMCMapper.ListMatch(['children', 'interface'])
self.service = None
gobject.idle_add(self.discover)
self.bus.dbus.add_signal_receiver(self.bus_handler,
dbus_interface = dbus.BUS_DAEMON_IFACE,
signal_name = 'NameOwnerChanged')
self.bus.dbus.add_signal_receiver(self.interfaces_added_handler,
dbus_interface = dbus.BUS_DAEMON_IFACE + '.ObjectManager',
signal_name = 'InterfacesAdded',
sender_keyword = 'sender')
self.bus.dbus.add_signal_receiver(self.interfaces_removed_handler,
dbus_interface = dbus.BUS_DAEMON_IFACE + '.ObjectManager',
signal_name = 'InterfacesRemoved',
sender_keyword = 'sender')
def bus_match(self, name):
if name == OpenBMCMapper.MAPPER_NAME:
return False
return self.name_match(name)
def discovery_pending(self):
return not bool(self.service)
def interfaces_added_handler(self, path, iprops, **kw):
name = self.bus.get_owned_name(self.bus_match, kw['sender'])
if self.discovery_pending() or \
not self.bus_match(name):
return
matches = [ x for x in iprops.iterkeys() if self.intf_match(x) ]
self.add_interfaces(path, kw['sender'], matches)
def interfaces_removed_handler(self, path, interfaces, **kw):
name = self.bus.get_owned_name(self.bus_match, kw['sender'])
if self.discovery_pending() or \
not self.bus_match(name):
return
item = self.cache[path]
sender = kw['sender']
for x in interfaces:
if self.intf_match(x):
try:
item[sender].remove(x)
except ValueError:
pass
# remove the owner if there aren't any interfaces left
if not item[sender]:
del item[sender]
# update if interfaces remain
if item:
self.cache[path] = item
# mark for removal if no interfaces remain
elif self.cache.get_children(path):
self.cache.demote(path)
# delete the entire path if everything is gone
else:
del self.cache[path]
def process_new_owner(self, name):
# unique name
return self.discover([ IntrospectionParser(name,
self.bus.dbus, self.tag_match, self.intf_match) ])
def process_old_owner(self, name):
for x,y in self.cache.dataitems():
if name not in y:
continue
del y[name]
if y:
self.cache[x] = y
elif self.cache.get_children(x):
self.cache.demote(x)
else:
del self.cache[x]
def bus_handler(self, service, old, new):
if self.discovery_pending() or \
not self.bus_match(service):
return
if new:
self.process_new_owner(new)
if old:
self.process_old_owner(old)
def add_interfaces(self, path, owner, interfaces):
d = self.cache.setdefault(path, {})
d = d.setdefault(owner, [])
self.cache[path][owner] = list(set(d + interfaces))
def add_items(self, owner, bus_items):
for x,y in bus_items.iteritems():
self.add_interfaces(x, owner, y['interfaces'])
def discover(self, owners = None):
if not owners:
owners = [ IntrospectionParser(x, self.bus.dbus,
self.tag_match, self.intf_match) \
for x in self.bus.get_owner_names(self.bus_match) ]
for o in owners:
self.add_items(o.name, o.introspect())
if self.discovery_pending():
print "ObjectMapper discovery complete..."
self.service = dbus.service.BusName(
OpenBMCMapper.MAPPER_NAME, self.bus.dbus)
@dbus.service.method(OpenBMCMapper.MAPPER_IFACE, 's', 'a{sas}')
def GetObject(self, path):
o = self.cache.get(path)
if not o:
raise MapperNotFoundException(path)
return o
@dbus.service.method(OpenBMCMapper.MAPPER_IFACE, 'si', 'as')
def GetSubTreePaths(self, path, depth):
try:
return self.cache.iterkeys(path, depth)
except KeyError:
raise MapperNotFoundException(path)
@dbus.service.method(OpenBMCMapper.MAPPER_IFACE, 'si', 'a{sa{sas}}')
def GetSubTree(self, path, depth):
try:
return { x:y for x, y in self.cache.dataitems(path, depth) }
except KeyError:
raise MapperNotFoundException(path)
class BusWrapper:
def __init__(self, bus):
self.dbus = bus
def get_owned_name(self, match, bus):
for x in self.get_service_names(match):
if self.dbus.get_name_owner(x) == bus:
return x
def get_service_names(self, match):
# these are well known names
return [ x for x in self.dbus.list_names() \
if match(x) ]
def get_owner_names(self, match):
# these are unique connection names
return list( set( [ self.dbus.get_name_owner(x) \
for x in self.get_service_names(match) ] ) )
if __name__ == '__main__':
dbus.mainloop.glib.DBusGMainLoop(set_as_default=True)
bus = dbus.SystemBus()
o = ObjectMapper(BusWrapper(bus), OpenBMCMapper.MAPPER_PATH)
loop = gobject.MainLoop()
loop.run()
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