Remove redundant `get_current_events_token` (#11643)

* Push `get_room_{min,max_stream_ordering}` into StreamStore

Both implementations of this are identical, so we may as well push it down and
get rid of the abstract base class nonsense.

* Remove redundant `StreamStore` class

This is empty now

* Remove redundant `get_current_events_token`

This was an exact duplicate of `get_room_max_stream_ordering`, so let's get rid
of it.

* newsfile

2 files changed, 2 insertions, 2 deletions

diff --git a/synapse/handlers/federation_event.py b/synapse/handlers/federation_event.py
index 9917613298..d08e48da58 100644
--- a/synapse/handlers/federation_event.py
+++ b/synapse/handlers/federation_event.py
@@ -1838,7 +1838,7 @@ class FederationEventHandler:
             The stream ID after which all events have been persisted.
         """
         if not event_and_contexts:
-            return self._store.get_current_events_token()
+            return self._store.get_room_max_stream_ordering()
 
         instance = self._config.worker.events_shard_config.get_instance(room_id)
         if instance != self._instance_name:
diff --git a/synapse/handlers/presence.py b/synapse/handlers/presence.py
index 454d06c973..c781fefb1b 100644
--- a/synapse/handlers/presence.py
+++ b/synapse/handlers/presence.py
@@ -729,7 +729,7 @@ class PresenceHandler(BasePresenceHandler):
 
         # Presence is best effort and quickly heals itself, so lets just always
         # stream from the current state when we restart.
-        self._event_pos = self.store.get_current_events_token()
+        self._event_pos = self.store.get_room_max_stream_ordering()
         self._event_processing = False
 
     async def _on_shutdown(self) -> None: