From f108073d5e3b2d7a39c2a9bbe5890773617c6b6c Mon Sep 17 00:00:00 2001
From: Erik Johnston <erik@matrix.org>
Date: Thu, 22 Aug 2024 16:46:35 +0100
Subject: [PATCH] Make PerConnectionState immutable

---
 synapse/types/handlers/sliding_sync.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/synapse/types/handlers/sliding_sync.py b/synapse/types/handlers/sliding_sync.py
index 084aedea4a..a79dcb815e 100644
--- a/synapse/types/handlers/sliding_sync.py
+++ b/synapse/types/handlers/sliding_sync.py
@@ -682,7 +682,7 @@ class HaveSentRoomFlag(Enum):
     LIVE = "live"
 
 
-T = TypeVar("T")
+T = TypeVar("T", str, RoomStreamToken, MultiWriterStreamToken)
 
 
 @attr.s(auto_attribs=True, slots=True, frozen=True)
@@ -797,7 +797,7 @@ def record_unsent_rooms(self, room_ids: StrCollection, from_token: T) -> None:
             self._statuses[room_id] = HaveSentRoom.previously(from_token)
 
 
-@attr.s(auto_attribs=True)
+@attr.s(auto_attribs=True, frozen=True)
 class PerConnectionState:
     """The per-connection state. A snapshot of what we've sent down the
     connection before.