Create a new stream_id per presence update

synapse/storage/presence.py

@@ -58,17 +58,20 @@ class UserPresenceState(namedtuple("UserPresenceState",
 class PresenceStore(SQLBaseStore):
     @defer.inlineCallbacks
     def update_presence(self, presence_states):
-        stream_id_manager = yield self._presence_id_gen.get_next(self)
-        with stream_id_manager as stream_id:
+        stream_ordering_manager = yield self._presence_id_gen.get_next_mult(
+            self, len(presence_states)
+        )
+
+        with stream_ordering_manager as stream_orderings:
             yield self.runInteraction(
                 "update_presence",
-                self._update_presence_txn, stream_id, presence_states,
+                self._update_presence_txn, stream_orderings, presence_states,
             )
 
-        defer.returnValue((stream_id, self._presence_id_gen.get_max_token()))
+        defer.returnValue((stream_orderings[-1], self._presence_id_gen.get_max_token()))
 
-    def _update_presence_txn(self, txn, stream_id, presence_states):
-        for state in presence_states:
+    def _update_presence_txn(self, txn, stream_orderings, presence_states):
+        for stream_id, state in zip(stream_orderings, presence_states):
             txn.call_after(
                 self.presence_stream_cache.entity_has_changed,
                 state.user_id, stream_id,