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-rw-r--r--synapse/storage/events.py14
1 files changed, 12 insertions, 2 deletions
diff --git a/synapse/storage/events.py b/synapse/storage/events.py
index 2f482af3a1..bbf6e42195 100644
--- a/synapse/storage/events.py
+++ b/synapse/storage/events.py
@@ -231,12 +231,18 @@ class EventsStore(EventsWorkerStore):
 
         self._state_resolution_handler = hs.get_state_resolution_handler()
 
+    @defer.inlineCallbacks
     def persist_events(self, events_and_contexts, backfilled=False):
         """
         Write events to the database
         Args:
             events_and_contexts: list of tuples of (event, context)
-            backfilled: ?
+            backfilled (bool): Whether the results are retrieved from federation
+                via backfill or not. Used to determine if they're "new" events
+                which might update the current state etc.
+
+        Returns:
+            Deferred[int]: he stream ordering of the latest persisted event
         """
         partitioned = {}
         for event, ctx in events_and_contexts:
@@ -253,10 +259,14 @@ class EventsStore(EventsWorkerStore):
         for room_id in partitioned:
             self._maybe_start_persisting(room_id)
 
-        return make_deferred_yieldable(
+        yield make_deferred_yieldable(
             defer.gatherResults(deferreds, consumeErrors=True)
         )
 
+        max_persisted_id = yield self._stream_id_gen.get_current_token()
+
+        defer.returnValue(max_persisted_id)
+
     @defer.inlineCallbacks
     @log_function
     def persist_event(self, event, context, backfilled=False):