services/presence/server_plugin.py: Handle presence more correctly.

This avoids unnecessary attempts to look up the buddy properties of
channel-specific handles (which doesn't work) by only looking up the buddy
properties of people we're subscribed to.
Also, this approves subscription requests that come in while we're online,
rather than handling them when we next go from offline to online.

services/presence/server_plugin.py

@@ -320,11 +320,22 @@ class ServerPlugin(gobject.GObject):
 
         # the group of contacts who may receive your presence
         publish = self._request_list_channel('publish')
-        publish_handles, local_pending, remote_pending = publish[CHANNEL_INTERFACE_GROUP].GetAllMembers()
+        self._publish_channel = publish
+        publish[CHANNEL_INTERFACE_GROUP].connect_to_signal('MembersChanged',
+                self._publish_members_changed_cb)
+        publish_handles, local_pending, remote_pending = \
+                publish[CHANNEL_INTERFACE_GROUP].GetAllMembers()
 
         # the group of contacts for whom you wish to receive presence
         subscribe = self._request_list_channel('subscribe')
-        subscribe_handles = subscribe[CHANNEL_INTERFACE_GROUP].GetMembers()
+        self._subscribe_channel = subscribe
+        subscribe[CHANNEL_INTERFACE_GROUP].connect_to_signal('MembersChanged',
+                self._subscribe_members_changed_cb)
+        subscribe_handles, subscribe_lp, subscribe_rp = \
+                subscribe[CHANNEL_INTERFACE_GROUP].GetAllMembers()
+        self._subscribe_members = set(subscribe_handles)
+        self._subscribe_local_pending = set(subscribe_lp)
+        self._subscribe_remote_pending = set(subscribe_rp)
 
         if local_pending:
             # accept pending subscriptions
@@ -364,8 +375,7 @@ class ServerPlugin(gobject.GObject):
         self._set_self_current_activity()
         self._set_self_avatar()
 
-        # Request presence for everyone on the channel
+        # Request presence for everyone we're subscribed to
-        subscribe_handles = subscribe[CHANNEL_INTERFACE_GROUP].GetMembers()
         self._conn[CONN_INTERFACE_PRESENCE].RequestPresence(subscribe_handles)
         return True
 
@@ -690,6 +700,13 @@ class ServerPlugin(gobject.GObject):
 
     def _contact_online(self, handle):
         """Handle a contact coming online"""
+        if (handle not in self._subscribe_members and
+                handle not in self._subscribe_local_pending and
+                handle not in self._subscribe_remote_pending):
+            # it's probably a channel-specific handle - can't create a Buddy
+            # object
+            return
+
         self._online_contacts[handle] = None
         if handle == self._conn[CONN_INTERFACE].GetSelfHandle():
             jid = self._conn[CONN_INTERFACE].InspectHandles(CONNECTION_HANDLE_TYPE_CONTACT, [handle])[0]
@@ -702,6 +719,34 @@ class ServerPlugin(gobject.GObject):
             reply_handler=lambda *args: self._contact_online_properties_cb(handle, *args),
             error_handler=lambda *args: self._contact_online_properties_error_cb(handle, *args))
 
+    def _subscribe_members_changed_cb(self, added, removed, local_pending,
+            remote_pending, actor, reason):
+        for handle in added:
+            self._subscribe_members.add(handle)
+        for handle in local_pending:
+            self._subscribe_local_pending.add(handle)
+        for handle in remote_pending:
+            self._subscribe_remote_pending.add(handle)
+        for handle in removed:
+            self._subscribe_members.discard(handle)
+            self._subscribe_local_pending.discard(handle)
+            self._subscribe_remote_pending.discard(handle)
+
+    def _publish_members_changed_cb(self, added, removed, local_pending,
+            remote_pending, actor, reason):
+
+        if local_pending:
+            # accept all requested subscriptions
+            self._publish_channel[CHANNEL_INTERFACE_GROUP].AddMembers(
+                    local_pending, '')
+
+        # subscribe to people who've subscribed to us, if necessary
+        added = list(set(added) - self._subscribe_members
+                     - self._subscribe_remote_pending)
+        if added:
+            self._subscribe_channel[CHANNEL_INTERFACE_GROUP].AddMembers(
+                    added, '')
+
     def _presence_update_cb(self, presence):
         """Send update for online/offline status of presence"""
         for handle in presence: