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-rw-r--r--synapse/replication/tcp/commands.py7
-rw-r--r--synapse/replication/tcp/handler.py15
2 files changed, 10 insertions, 12 deletions
diff --git a/synapse/replication/tcp/commands.py b/synapse/replication/tcp/commands.py
index f26aee83cb..c7880d4b63 100644
--- a/synapse/replication/tcp/commands.py
+++ b/synapse/replication/tcp/commands.py
@@ -210,7 +210,10 @@ class ReplicateCommand(Command):
 
 class UserSyncCommand(Command):
     """Sent by the client to inform the server that a user has started or
-    stopped syncing. Used to calculate presence on the master.
+    stopped syncing on this process.
+
+    This is used by the process handling presence (typically the master) to
+    calculate who is online and who is not.
 
     Includes a timestamp of when the last user sync was.
 
@@ -218,7 +221,7 @@ class UserSyncCommand(Command):
 
         USER_SYNC <instance_id> <user_id> <state> <last_sync_ms>
 
-    Where <state> is either "start" or "stop"
+    Where <state> is either "start" or "end"
     """
 
     NAME = "USER_SYNC"
diff --git a/synapse/replication/tcp/handler.py b/synapse/replication/tcp/handler.py
index 5b5ee2c13e..0db5a3a24d 100644
--- a/synapse/replication/tcp/handler.py
+++ b/synapse/replication/tcp/handler.py
@@ -337,13 +337,6 @@ class ReplicationCommandHandler:
         if self._is_master:
             self._notifier.notify_remote_server_up(cmd.data)
 
-    def get_currently_syncing_users(self):
-        """Get the list of currently syncing users (if any). This is called
-        when a connection has been established and we need to send the
-        currently syncing users.
-        """
-        return self._presence_handler.get_currently_syncing_users()
-
     def new_connection(self, connection: AbstractConnection):
         """Called when we have a new connection.
         """
@@ -361,9 +354,11 @@ class ReplicationCommandHandler:
         if self._factory:
             self._factory.resetDelay()
 
-        # Tell the server if we have any users currently syncing (should only
-        # happen on synchrotrons)
-        currently_syncing = self.get_currently_syncing_users()
+        # Tell the other end if we have any users currently syncing.
+        currently_syncing = (
+            self._presence_handler.get_currently_syncing_users_for_replication()
+        )
+
         now = self._clock.time_msec()
         for user_id in currently_syncing:
             connection.send_command(