Make token serializing/deserializing async (#8427)

The idea is that in future tokens will encode a mapping of instance to position. However, we don't want to include the full instance name in the string representation, so instead we'll have a mapping between instance name and an immutable integer ID in the DB that we can use instead. We'll then do the lookup when we serialize/deserialize the token (we could alternatively pass around an `Instance` type that includes both the name and ID, but that turns out to be a lot more invasive).

1 files changed, 4 insertions, 4 deletions

diff --git a/synapse/handlers/pagination.py b/synapse/handlers/pagination.py
index d6779a4b44..2c2a633938 100644
--- a/synapse/handlers/pagination.py
+++ b/synapse/handlers/pagination.py
@@ -413,8 +413,8 @@ class PaginationHandler:
         if not events:
             return {
                 "chunk": [],
-                "start": from_token.to_string(),
-                "end": next_token.to_string(),
+                "start": await from_token.to_string(self.store),
+                "end": await next_token.to_string(self.store),
             }
 
         state = None
@@ -442,8 +442,8 @@ class PaginationHandler:
                     events, time_now, as_client_event=as_client_event
                 )
             ),
-            "start": from_token.to_string(),
-            "end": next_token.to_string(),
+            "start": await from_token.to_string(self.store),
+            "end": await next_token.to_string(self.store),
         }
 
         if state: