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More documentation, mostly for the sugar.presence.presenceservice

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module.
master
Mike C. Fletcher 17 years ago
parent a2de1f7f3f
commit 0fc5e67dcc
4 changed files with 159 additions and 1 deletions
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5
sugar/clipboard/__init__.py
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"""Client-code's interface to the ClipboardService
Provides a simplified API for accessing the dbus service
which coordinates clipboard operations within Sugar.
"""

1
sugar/graphics/__init__.py
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"""Hippo-based graphics/controls for use in Sugar"""

7
sugar/presence/__init__.py
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"""Client-code's interface to the PresenceService
Provides a simplified API for accessing the dbus service
which coordinates native network presence and sharing
information. This includes both "buddies" and "shared
activities".
"""

147
sugar/presence/presenceservice.py
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@ -1,3 +1,4 @@
"""UI class to access system-level presence object"""
# Copyright (C) 2007, Red Hat, Inc.
#
# This library is free software; you can redistribute it and/or
@ -18,24 +19,78 @@
import dbus, dbus.glib, gobject
import logging
# XXX use absolute imports
# from sugar.presence import buddy, activity
# this *kind* of relative import is deprecated
# with an explicit relative import slated to be
# introduced (available in Python 2.5 with a __future__
# import), that would read as:
# from . import buddy, activity
# see PEP: http://docs.python.org/whatsnew/pep-328.html
import buddy, activity
class ObjectCache(object):
"""Path to Activity/Buddy object cache
On notification of a new object of either type the
PresenceService client stores the object's representation
in this object.
XXX Why not just sub-class dict? We're only adding two
methods then and we would have all of the other
standard operations on dictionaries.
"""
def __init__(self):
"""Initialise the cache"""
self._cache = {}
def get(self, object_path):
"""Retrieve specified object from the cache
object_path -- full dbus path to the object
returns a presence.buddy.Buddy or presence.activity.Activity
instance or None if the object_path is not yet cached.
XXX could be written as return self._cache.get( object_path )
"""
try:
return self._cache[object_path]
except KeyError:
return None
def add(self, obj):
"""Adds given presence object to the cache
obj -- presence Buddy or Activity representation, the object's
object_path() method is used as the key for storage
returns None
XXX should raise an error on collisions, shouldn't it? or
return True/False to say whether the item was actually
added
"""
op = obj.object_path()
if not self._cache.has_key(op):
self._cache[op] = obj
def remove(self, object_path):
"""Remove the given presence object from the cache
object_path -- full dbus path to the object
returns None
XXX does two checks instead of one with a try:except for the
keyerror, normal case of deleting existing penalised as
a result.
try:
return self._cache.pop( key )
except KeyError:
return None
"""
if self._cache.has_key(object_path):
del self._cache[object_path]
@ -46,7 +101,13 @@ DBUS_PATH = "/org/laptop/Sugar/Presence"
class PresenceService(gobject.GObject):
"""UI-side interface to the dbus presence service
This class provides UI programmers with simplified access
to the dbus service of the same name. It allows for observing
various events from the presence service as GObject events,
as well as some basic introspection queries.
"""
__gsignals__ = {
'buddy-appeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
([gobject.TYPE_PYOBJECT])),
@ -71,6 +132,7 @@ class PresenceService(gobject.GObject):
def __init__(self):
"""Initialise the service and connect to events"""
gobject.GObject.__init__(self)
self._objcache = ObjectCache()
self._bus = dbus.SessionBus()
@ -84,6 +146,17 @@ class PresenceService(gobject.GObject):
self._ps.connect_to_signal('PrivateInvitation', self._private_invitation_cb)
def _new_object(self, object_path):
"""Turn new object path into (cached) Buddy/Activity instance
object_path -- full dbus path of the new object, must be
prefixed with either of _PS_BUDDY_OP or _PS_ACTIVITY_OP
Note that this method is called throughout the class whenever
the representation of the object is required, it is not only
called when the object is first discovered.
returns presence Buddy or Activity representation
"""
obj = self._objcache.get(object_path)
if not obj:
if object_path.startswith(self._PS_BUDDY_OP):
@ -102,52 +175,79 @@ class PresenceService(gobject.GObject):
pass
def _emit_buddy_appeared_signal(self, object_path):
"""Emit GObject event with presence.buddy.Buddy object"""
self.emit('buddy-appeared', self._new_object(object_path))
return False
def _buddy_appeared_cb(self, op):
"""Callback for dbus event (forwards to method to emit GObject event)"""
gobject.idle_add(self._emit_buddy_appeared_signal, op)
def _emit_buddy_disappeared_signal(self, object_path):
"""Emit GObject event with presence.buddy.Buddy object"""
self.emit('buddy-disappeared', self._new_object(object_path))
return False
def _buddy_disappeared_cb(self, object_path):
"""Callback for dbus event (forwards to method to emit GObject event)"""
gobject.idle_add(self._emit_buddy_disappeared_signal, object_path)
def _emit_activity_invitation_signal(self, object_path):
"""Emit GObject event with presence.activity.Activity object"""
self.emit('activity-invitation', self._new_object(object_path))
return False
def _activity_invitation_cb(self, object_path):
"""Callback for dbus event (forwards to method to emit GObject event)"""
gobject.idle_add(self._emit_activity_invitation_signal, object_path)
def _emit_private_invitation_signal(self, bus_name, connection, channel):
"""Emit GObject event with bus_name, connection and channel
XXX This seems to generate the wrong GObject event? It generates
'service-disappeared' instead of private-invitation for some
reason. That event doesn't even seem to be registered?
"""
self.emit('service-disappeared', bus_name, connection, channel)
return False
def _private_invitation_cb(self, bus_name, connection, channel):
"""Callback for dbus event (forwards to method to emit GObject event)"""
gobject.idle_add(self._emit_service_disappeared_signal, bus_name,
connection, channel)
def _emit_activity_appeared_signal(self, object_path):
"""Emit GObject event with presence.activity.Activity object"""
self.emit('activity-appeared', self._new_object(object_path))
return False
def _activity_appeared_cb(self, object_path):
"""Callback for dbus event (forwards to method to emit GObject event)"""
gobject.idle_add(self._emit_activity_appeared_signal, object_path)
def _emit_activity_disappeared_signal(self, object_path):
"""Emit GObject event with presence.activity.Activity object"""
self.emit('activity-disappeared', self._new_object(object_path))
return False
def _activity_disappeared_cb(self, object_path):
"""Callback for dbus event (forwards to method to emit GObject event)"""
gobject.idle_add(self._emit_activity_disappeared_signal, object_path)
def get(self, object_path):
"""Retrieve given object path as a Buddy/Activity object
XXX This is basically just an alias for _new_object, i.e. it
just adds an extra function-call to the operation.
"""
return self._new_object(object_path)
def get_activities(self):
"""Retrieve set of all activities from service
returns list of Activity objects for all object paths
the service reports exist (using GetActivities)
"""
resp = self._ps.GetActivities()
acts = []
for item in resp:
@ -155,6 +255,13 @@ class PresenceService(gobject.GObject):
return acts
def get_activity(self, activity_id):
"""Retrieve single Activity object for the given unique id
activity_id -- unique ID for the activity
returns single Activity object or None if the activity
is not found using GetActivityById on the service
"""
try:
act_op = self._ps.GetActivityById(activity_id)
except dbus.exceptions.DBusException:
@ -162,6 +269,11 @@ class PresenceService(gobject.GObject):
return self._new_object(act_op)
def get_buddies(self):
"""Retrieve set of all buddies from service
returns list of Buddy objects for all object paths
the service reports exist (using GetBuddies)
"""
resp = self._ps.GetBuddies()
buddies = []
for item in resp:
@ -169,6 +281,14 @@ class PresenceService(gobject.GObject):
return buddies
def get_buddy(self, key):
"""Retrieve single Buddy object for the given public key
key -- buddy's public encryption key
returns single Buddy object or None if the activity
is not found using GetBuddyByPublicKey on the
service
"""
try:
buddy_op = self._ps.GetBuddyByPublicKey(dbus.ByteArray(key))
except dbus.exceptions.DBusException:
@ -176,6 +296,12 @@ class PresenceService(gobject.GObject):
return self._new_object(buddy_op)
def get_owner(self):
"""Retrieves "owner" as a Buddy
XXX check that it really is a Buddy that's produced, what is
this the owner of? Shouldn't it be getting an activity
and then asking who the owner of that is?
"""
try:
owner_op = self._ps.GetOwner()
except dbus.exceptions.DBusException:
@ -183,13 +309,27 @@ class PresenceService(gobject.GObject):
return self._new_object(owner_op)
def _share_activity_cb(self, activity, op):
"""Notify with GObject event of successful sharing of activity"""
self.emit("activity-shared", True, self._new_object(op), None)
def _share_activity_error_cb(self, activity, err):
"""Notify with GObject event of unsuccessful sharing of activity"""
logging.debug("Error sharing activity %s: %s" % (activity.get_id(), err))
self.emit("activity-shared", False, None, err)
def share_activity(self, activity, properties={}):
"""Ask presence service to ask the activity to share itself
Uses the ShareActivity method on the service to ask for the
sharing of the given activity. Arranges to emit activity-shared
event with:
(success, Activity, err)
on success/failure.
returns None
"""
actid = activity.get_id()
atype = activity.get_service_name()
name = activity.props.title
@ -199,6 +339,10 @@ class PresenceService(gobject.GObject):
class _MockPresenceService(gobject.GObject):
"""Test fixture allowing testing of items that use PresenceService
See PresenceService for usage and purpose
"""
__gsignals__ = {
'buddy-appeared': (gobject.SIGNAL_RUN_FIRST, gobject.TYPE_NONE,
([gobject.TYPE_PYOBJECT])),
@ -238,6 +382,7 @@ class _MockPresenceService(gobject.GObject):
_ps = None
def get_instance():
"""Retrieve this process' view of the PresenceService"""
global _ps
if not _ps:
_ps = PresenceService()

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