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