Modify get_interested_parties and get_interested_remotes to query…

… PresenceRouter

This commit asks the PresenceRouter for any users - in addition to those
from users that they share a room with - that should receive the given
presence updates.

These methods are called when routing new presence updates around as
they come in.

* `get_interested_parties` is called when figuring out which local and
remote users to send presence to. For local users, their sync streams
will be woken up.
* `get_interested_remotes` is specifically for figuring out which remote
user(s) a given presence update needs to go to.

synapse/handlers/presence.py

@@ -1314,14 +1314,15 @@ def handle_update(prev_state, new_state, is_mine, wheel_timer, now):
 
 
 async def get_interested_parties(
-    store: DataStore, states: List[UserPresenceState]
+    store: DataStore, presence_router: PresenceRouter, states: List[UserPresenceState]
 ) -> Tuple[Dict[str, List[UserPresenceState]], Dict[str, List[UserPresenceState]]]:
     """Given a list of states return which entities (rooms, users)
     are interested in the given states.
 
     Args:
-        store
-        states
+        store: The homeserver's data store.
+        presence_router: A module for augmenting the destinations for presence updates.
+        states: A list of incoming user presence updates.
 
     Returns:
         A 2-tuple of `(room_ids_to_states, users_to_states)`,
@@ -1337,21 +1338,33 @@ async def get_interested_parties(
         # Always notify self
         users_to_states.setdefault(state.user_id, []).append(state)
 
+    # Ask a presence routing module for any additional parties if one
+    # is loaded.
+    router_users_to_states = await presence_router.get_users_for_states(states)
+
+    # Update the dictionaries with additional destinations and state to send
+    for user_id, user_states in router_users_to_states.items():
+        users_to_states.setdefault(user_id, []).extend(user_states)
+
     return room_ids_to_states, users_to_states
 
 
 async def get_interested_remotes(
-    store: DataStore, states: List[UserPresenceState], state_handler: StateHandler
+    store: DataStore,
+    presence_router: PresenceRouter,
+    states: List[UserPresenceState],
+    state_handler: StateHandler,
 ) -> List[Tuple[Collection[str], List[UserPresenceState]]]:
     """Given a list of presence states figure out which remote servers
     should be sent which.
 
     All the presence states should be for local users only.
 
     Args:
-        store
-        states
-        state_handler
+        store: The homeserver's data store.
+        presence_router: A module for augmenting the destinations for presence updates.
+        states: A list of incoming user presence updates.
+        state_handler:
 
     Returns:
         A list of 2-tuples of destinations and states, where for
@@ -1363,7 +1376,9 @@ async def get_interested_remotes(
     # First we look up the rooms each user is in (as well as any explicit
     # subscriptions), then for each distinct room we look up the remote
     # hosts in those rooms.
-    room_ids_to_states, users_to_states = await get_interested_parties(store, states)
+    room_ids_to_states, users_to_states = await get_interested_parties(
+        store, presence_router, states
+    )
 
     for room_id, states in room_ids_to_states.items():
         hosts = await state_handler.get_current_hosts_in_room(room_id)