sugar-toolkit-gtk3/shell/PresenceService/Buddy.py

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import base64
import logging
import gtk
import gobject
import dbus, dbus.service
PRESENCE_SERVICE_TYPE = "_presence_olpc._tcp"
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BUDDY_DBUS_OBJECT_PATH = "/org/laptop/Presence/Buddies/"
BUDDY_DBUS_INTERFACE = "org.laptop.Presence.Buddy"
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 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.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="", out_signature="o")
def getServiceOfType(self, stype):
service = self._parent.get_service_of_type(stype)
if not service:
raise NotFoundError("Not found")
return service
@dbus.service.method(BUDDY_DBUS_INTERFACE,
in_signature="", out_signature="ao")
def getJoinedActivities(self):
acts = []
return acts
@dbus.service.method(BUDDY_DBUS_INTERFACE,
in_signature="", out_signature="a{sv}")
def getProperties(self):
props = {}
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props['name'] = self._parent.get_name()
props['ip4_address'] = self._parent.get_address()
props['owner'] = self._parent.is_owner()
return props
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, owner=False):
if not bus_name:
raise ValueError("DBus bus name must be valid")
if not object_id or type(object_id) != type(1):
raise ValueError("object id must be a valid number")
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if not isinstance(service, Service.Service):
raise ValueError("service must be a valid service object")
self._services = {}
self._activities = {}
self._nick_name = service.get_name()
self._address = service.get_publisher_address()
self._valid = False
self._icon = None
self._icon_tries = 0
self._owner = owner
self._object_id = object_id
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self._object_path = BUDDY_DBUS_OBJECT_PATH + str(self._object_id)
self._dbus_helper = BuddyDBusHelper(self, bus_name, self._object_path)
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)
print "Buddy icon for '%s' is size %d" % (self._nick_name, len(icon))
self._set_icon(icon)
if (result_status == network.RESULT_FAILED or not icon) and self._icon_tries < 3:
self._icon_tries = self._icon_tries + 1
print "Failed to retrieve buddy icon for '%s' on try %d of %d" % (self._nick_name, \
self._icon_tries, 3)
gobject.timeout_add(1000, self._request_buddy_icon, service)
return False
def _request_buddy_icon(self, service):
"""Contact the buddy to retrieve the buddy icon."""
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._request_buddy_icon, service)
return False
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:
return False
publisher_addr = service.get_publisher_address()
if publisher_addr != self._address:
logging.error('Service publisher and buddy address doesnt match: %s %s' % (publisher_addr, self._address))
return False
stype = service.get_type()
if stype in self._services.keys():
return False
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logging.debug("Buddy %s added service type %s id %s" % (self._nick_name, service.get_type(), service.get_activity_id()))
self._services[stype] = service
service.set_owner(self)
if stype == PRESENCE_SERVICE_TYPE:
# A buddy isn't valid until its official presence
# service has been found and resolved
self._valid = True
print 'Requesting buddy icon %s' % self._nick_name
self._request_buddy_icon(service)
if self._valid:
self._dbus_helper.ServiceAppeared(service.object_path())
return True
def add_activity(self, activity):
actid = activity.get_id()
if activity in self._activities.values():
raise RuntimeError("Tried to add activity twice")
found = False
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logging.debug("Buddy %s looking for actid %s" % (self._nick_name, activity.get_id()))
for serv in self._services.values():
if serv.get_activity_id() == activity.get_id():
found = True
break
if not found:
raise RuntimeError("Tried to add activity for which we had no service")
self._activities[actid] = activity
print "Buddy (%s) joined activity %s." % (self._nick_name, actid)
self._dbus_helper.JoinedActivity(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_publisher_address() != self._address:
return
if service.get_name() != self._nick_name:
return
stype = service.get_type()
if self._services.has_key(stype):
if self._valid:
self._dbus_helper.ServiceDisappeared(service.object_path())
del self._services[stype]
if stype == PRESENCE_SERVICE_TYPE:
self._valid = False
def remove_activity(self, activity):
actid = activity.get_id()
if not self._activities.has_key(actid):
return
del self._activities[actid]
print "Buddy (%s) left activity %s." % (self._nick_name, actid)
self._dbus_helper.LeftActivity(activity.object_path())
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:
actid = activity.get_id()
for service in self._services.values():
if service.get_type() == stype and service.get_activity_id() == actid:
return service
if self._services.has_key(stype):
return self._services[stype]
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_pixbuf(self):
if self._icon:
pbl = gtk.gdk.PixbufLoader()
pbl.write(self._icon)
pbl.close()
return pbl.get_pixbuf()
else:
return None
def get_icon(self):
"""Return the buddies icon, if any."""
return self._icon
def get_address(self):
return self._address
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def get_name(self):
return self._nick_name
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 self._owner
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, bus_name, object_id, service):
Buddy.__init__(self, bus_name, object_id, service, owner=True)
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#################################################################
# 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)
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assert buddy.get_name() == self._DEF_NAME, "buddy name wasn't correct after init."
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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()