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import base64
import logging
import gobject
import dbus, dbus.service
from sugar import env
PRESENCE_SERVICE_TYPE = "_presence_olpc._tcp"
BUDDY_DBUS_OBJECT_PATH = "/org/laptop/Presence/Buddies/"
BUDDY_DBUS_INTERFACE = "org.laptop.Presence.Buddy"
_BUDDY_KEY_COLOR = 'color'
_BUDDY_KEY_CURACT = 'curact'
class NotFoundError(Exception):
pass
class BuddyDBusHelper(dbus.service.Object):
def __init__(self, parent, bus_name, object_path):
self._parent = parent
self._bus_name = bus_name
self._object_path = object_path
dbus.service.Object.__init__(self, bus_name, self._object_path)
@dbus.service.signal(BUDDY_DBUS_INTERFACE,
signature="o")
def ServiceAppeared(self, object_path):
pass
@dbus.service.signal(BUDDY_DBUS_INTERFACE,
signature="o")
def ServiceDisappeared(self, object_path):
pass
@dbus.service.signal(BUDDY_DBUS_INTERFACE,
signature="")
def Disappeared(self):
pass
@dbus.service.signal(BUDDY_DBUS_INTERFACE,
signature="ao")
def CurrentActivityChanged(self, activities):
pass
@dbus.service.signal(BUDDY_DBUS_INTERFACE,
signature="")
def IconChanged(self):
pass
@dbus.service.signal(BUDDY_DBUS_INTERFACE,
signature="o")
def JoinedActivity(self, object_path):
pass
@dbus.service.signal(BUDDY_DBUS_INTERFACE,
signature="o")
def LeftActivity(self, object_path):
pass
@dbus.service.signal(BUDDY_DBUS_INTERFACE,
signature="as")
def PropertyChanged(self, prop_list):
pass
@dbus.service.method(BUDDY_DBUS_INTERFACE,
in_signature="", out_signature="ay")
def getIcon(self):
icon = self._parent.get_icon()
if not icon:
return ""
return icon
@dbus.service.method(BUDDY_DBUS_INTERFACE,
in_signature="s", out_signature="o")
def getServiceOfType(self, stype):
service = self._parent.get_service_of_type(stype)
if not service:
raise NotFoundError("Not found")
return service.object_path()
@dbus.service.method(BUDDY_DBUS_INTERFACE,
in_signature="", out_signature="ao")
def getJoinedActivities(self):
acts = []
for act in self._parent.get_joined_activities():
acts.append(act.object_path())
return acts
@dbus.service.method(BUDDY_DBUS_INTERFACE,
in_signature="", out_signature="a{sv}")
def getProperties(self):
props = {}
props['name'] = self._parent.get_name()
addr = self._parent.get_address()
if addr:
props['ip4_address'] = addr
props['owner'] = self._parent.is_owner()
color = self._parent.get_color()
if color:
props[_BUDDY_KEY_COLOR] = self._parent.get_color()
return props
@dbus.service.method(BUDDY_DBUS_INTERFACE,
in_signature="", out_signature="o")
def getCurrentActivity(self):
activity = self._parent.get_current_activity()
if not activity:
raise NotFoundError()
return activity.object_path()
class Buddy(object):
"""Represents another person on the network and keeps track of the
activities and resources they make available for sharing."""
def __init__(self, bus_name, object_id, service, icon_cache):
if not bus_name:
raise ValueError("DBus bus name must be valid")
if not object_id or not isinstance(object_id, int):
raise ValueError("object id must be a valid number")
# Normal Buddy objects must be created with a valid service,
# owner objects do not
if not isinstance(self, Owner):
if not isinstance(service, Service.Service):
raise ValueError("service must be a valid service object")
self._services = {}
self._activities = {}
self._icon_cache = icon_cache
self._nick_name = None
self._address = None
if service is not None:
self._nick_name = service.get_name()
self._address = service.get_source_address()
self._color = None
self._current_activity = None
self._valid = False
self._icon = None
self._icon_tries = 0
self._object_id = object_id
self._object_path = BUDDY_DBUS_OBJECT_PATH + str(self._object_id)
self._dbus_helper = BuddyDBusHelper(self, bus_name, self._object_path)
self._buddy_presence_service = None
if service is not None:
self.add_service(service)
def object_path(self):
return dbus.ObjectPath(self._object_path)
def _request_buddy_icon_cb(self, result_status, response, user_data):
"""Callback when icon request has completed."""
from sugar.p2p import network
icon = response
service = user_data
if result_status == network.RESULT_SUCCESS:
if icon and len(icon):
icon = base64.b64decode(icon)
self._set_icon(icon)
self._icon_cache.add_icon(icon)
if (result_status == network.RESULT_FAILED or not icon) and self._icon_tries < 3:
self._icon_tries = self._icon_tries + 1
if self._icon_tries >= 3:
logging.debug("Failed to retrieve buddy icon for '%s'." % self._nick_name)
gobject.timeout_add(1000, self._get_buddy_icon, service, True)
return False
def _get_buddy_icon(self, service, retry=False):
"""Get the buddy's icon. Check the cache first, if its
not there get the icon from the buddy over the network."""
if retry != True:
# Only hit the cache once
icon_hash = service.get_one_property('icon-hash')
if icon_hash is not None:
icon = self._icon_cache.get_icon(icon_hash)
if icon:
logging.debug("%s: icon cache hit for %s." % (self._nick_name, icon_hash))
self._set_icon(icon)
return False
logging.debug("%s: icon cache miss, fetching icon from buddy..." % self._nick_name)
from sugar.p2p import Stream
buddy_stream = Stream.Stream.new_from_service(service, start_reader=False)
writer = buddy_stream.new_writer(service)
success = writer.custom_request("get_buddy_icon", self._request_buddy_icon_cb, service)
if not success:
del writer, buddy_stream
gobject.timeout_add(1000, self._get_buddy_icon, service, True)
return False
def _get_service_key(self, service):
return (service.get_type(), service.get_activity_id())
def add_service(self, service):
"""Adds a new service to this buddy's service list, returning
True if the service was successfully added, and False if it was not."""
if service.get_name() != self._nick_name:
logging.error("Service and buddy nick names doesn't match: " \
"%s %s" % (service.get_name(), self._nick_name))
return False
source_addr = service.get_source_address()
if source_addr != self._address:
logging.error("Service source and buddy address doesn't " \
"match: %s %s" % (source_addr, self._address))
return False
return self._internal_add_service(service)
def _internal_add_service(self, service):
service_key = self._get_service_key(service)
if service_key in self._services.keys():
logging.error("Service already known: %s %s" % (service_key[0],
service_key[1]))
return False
if service.get_type() == PRESENCE_SERVICE_TYPE and self._buddy_presence_service:
# already have a presence service for this buddy
logging.debug("!!! Tried to add a buddy presence service when " \
"one already existed.")
return False
logging.debug("Buddy %s added service type %s id %s" % (self._nick_name,
service.get_type(), service.get_activity_id()))
self._services[service_key] = service
service.set_owner(self)
if service.get_type() == PRESENCE_SERVICE_TYPE:
self._buddy_presence_service = service
# A buddy isn't valid until its official presence
# service has been found and resolved
self._valid = True
self._get_buddy_icon(service)
self._color = service.get_one_property(_BUDDY_KEY_COLOR)
self._current_activity = service.get_one_property(_BUDDY_KEY_CURACT)
# Monitor further buddy property changes, like current activity
# and color
service.connect('property-changed',
self.__buddy_presence_service_property_changed_cb)
if self._valid:
self._dbus_helper.ServiceAppeared(service.object_path())
return True
def __buddy_presence_service_property_changed_cb(self, service, keys):
if _BUDDY_KEY_COLOR in keys:
new_color = service.get_one_property(_BUDDY_KEY_COLOR)
if new_color and self._color != new_color:
self._color = new_color
self._dbus_helper.PropertyChanged([_BUDDY_KEY_COLOR])
if _BUDDY_KEY_CURACT in keys:
# Three cases here:
# 1) Buddy didn't publish a 'curact' key at all; we do nothing
# 2) Buddy published a blank/zero-length 'curact' key; we send
# a current-activity-changed signal for no activity
# 3) Buddy published a non-zero-length 'curact' key; we send
# a current-activity-changed signal if we know about the
# activity already, if not we postpone until the activity
# is found on the network and added to the buddy
new_curact = service.get_one_property(_BUDDY_KEY_CURACT)
if new_curact and self._current_activity != new_curact:
if not len(new_curact):
new_curact = None
self._current_activity = new_curact
if self._activities.has_key(self._current_activity):
# Case (3) above, valid activity id
activity = self._activities[self._current_activity]
if activity.is_valid():
self._dbus_helper.CurrentActivityChanged([activity.object_path()])
elif not self._current_activity:
# Case (2) above, no current activity
self._dbus_helper.CurrentActivityChanged([])
def __find_service_by_activity_id(self, actid):
for serv in self._services.values():
if serv.get_activity_id() == actid:
return serv
return None
def add_activity(self, activity):
if activity in self._activities.values():
return
actid = activity.get_id()
if not self.__find_service_by_activity_id(actid):
raise RuntimeError("Tried to add activity for which we had no service")
self._activities[actid] = activity
if activity.is_valid():
self._dbus_helper.JoinedActivity(activity.object_path())
# If when we received a current activity update from the buddy,
# but didn't know about that activity yet, and now we do know about
# it, we need to send out the changed activity signal
if actid == self._current_activity:
self._dbus_helper.CurrentActivityChanged([activity.object_path()])
def remove_service(self, service):
"""Remove a service from a buddy; ie, the activity was closed
or the buddy went away."""
if service.get_source_address() != self._address:
return
if service.get_name() != self._nick_name:
return
if service.get_type() == PRESENCE_SERVICE_TYPE \
and self._buddy_presence_service \
and service != self._buddy_presence_service:
logging.debug("!!! Tried to remove a spurious buddy presence service.")
return
service_key = self._get_service_key(service)
if self._services.has_key(service_key):
if self._valid:
self._dbus_helper.ServiceDisappeared(service.object_path())
del self._services[service_key]
if service.get_type() == PRESENCE_SERVICE_TYPE:
self._valid = False
self._dbus_helper.Disappeared()
def remove_activity(self, activity):
actid = activity.get_id()
if not self._activities.has_key(actid):
return
del self._activities[actid]
if activity.is_valid():
self._dbus_helper.LeftActivity(activity.object_path())
# If we just removed the buddy's current activity,
# send out a signal
if actid == self._current_activity:
self._current_activity = None
self._dbus_helper.CurrentActivityChanged([])
def get_joined_activities(self):
acts = []
for act in self._activities.values():
if act.is_valid():
acts.append(act)
return acts
def get_service_of_type(self, stype=None, activity=None):
"""Return a service of a certain type, or None if the buddy
doesn't provide that service."""
if not stype:
raise RuntimeError("Need to specify a service type.")
if activity and not activity.is_valid():
raise RuntimeError("Activity is not yet valid.")
if activity:
key = (stype, activity.get_id())
else:
key = (stype, None)
if self._services.has_key(key):
return self._services[key]
return None
def is_valid(self):
"""Return whether the buddy is valid or not. A buddy is
not valid until its official presence service has been found
and successfully resolved."""
return self._valid
def get_icon(self):
"""Return the buddies icon, if any."""
return self._icon
def get_address(self):
return self._address
def get_name(self):
return self._nick_name
def get_color(self):
return self._color
def get_current_activity(self):
if not self._current_activity:
return None
if not self._activities.has_key(self._current_activity):
return None
return self._activities[self._current_activity]
def _set_icon(self, icon):
"""Can only set icon for other buddies. The Owner
takes care of setting it's own icon."""
if icon != self._icon:
self._icon = icon
self._dbus_helper.IconChanged()
def is_owner(self):
return False
class Owner(Buddy):
"""Class representing the owner of the machine. This is the client
portion of the Owner, paired with the server portion in Owner.py."""
def __init__(self, ps, bus_name, object_id, icon_cache):
Buddy.__init__(self, bus_name, object_id, None, icon_cache)
self._nick_name = env.get_nick_name()
self._color = env.get_color()
self._ps = ps
def add_service(self, service):
"""Adds a new service to this buddy's service list, returning
True if the service was successfully added, and False if it was not."""
if service.get_name() != self._nick_name:
logging.error("Service and buddy nick names doesn't match: " \
"%s %s" % (service.get_name(), self._nick_name))
return False
# The Owner initially doesn't have an address, so the first
# service added to the Owner determines the owner's address
source_addr = service.get_source_address()
if self._address is None and service.is_local():
self._address = source_addr
self._dbus_helper.PropertyChanged(['ip4_address'])
# The owner bypasses address checks and only cares if
# avahi says the service is a local service
if not service.is_local():
logging.error("Cannot add remote service to owner object.")
return False
logging.debug("Adding owner service %s.%s at %s:%d." % (service.get_name(),
service.get_type(), service.get_source_address(),
service.get_port()))
return self._internal_add_service(service)
def is_owner(self):
return True
#################################################################
# Tests
#################################################################
import unittest
import Service
__objid_seq = 0
def _next_objid():
global __objid_seq
__objid_seq = __objid_seq + 1
return __objid_seq
class BuddyTestCase(unittest.TestCase):
_DEF_NAME = u"Tommy"
_DEF_STYPE = unicode(PRESENCE_SERVICE_TYPE)
_DEF_DOMAIN = u"local"
_DEF_ADDRESS = u"1.1.1.1"
_DEF_PORT = 1234
def __init__(self, name):
self._bus = dbus.SessionBus()
self._bus_name = dbus.service.BusName('org.laptop.Presence', bus=self._bus)
unittest.TestCase.__init__(self, name)
def __del__(self):
del self._bus_name
del self._bus
def _test_init_fail(self, service, fail_msg):
"""Test something we expect to fail."""
try:
objid = _next_objid()
buddy = Buddy(self._bus_name, objid, service, owner=False)
except ValueError, exc:
pass
else:
self.fail("expected a ValueError for %s." % fail_msg)
def testService(self):
service = None
self._test_init_fail(service, "invalid service")
def testGoodInit(self):
objid = _next_objid()
service = Service.Service(self._bus_name, objid, self._DEF_NAME, self._DEF_STYPE, self._DEF_DOMAIN,
self._DEF_ADDRESS, self._DEF_PORT)
objid = _next_objid()
buddy = Buddy(self._bus_name, objid, service)
assert buddy.get_name() == self._DEF_NAME, "buddy name wasn't correct after init."
assert buddy.get_address() == self._DEF_ADDRESS, "buddy address wasn't correct after init."
assert buddy.object_path() == BUDDY_DBUS_OBJECT_PATH + str(objid)
def addToSuite(suite):
suite.addTest(BuddyTestCase("testService"))
suite.addTest(BuddyTestCase("testGoodInit"))
addToSuite = staticmethod(addToSuite)
def main():
suite = unittest.TestSuite()
BuddyTestCase.addToSuite(suite)
runner = unittest.TextTestRunner()
runner.run(suite)
if __name__ == "__main__":
main()
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