Wait for streams to catch up when processing HTTP replication. (#14820)

This should hopefully mitigate a class of races where data gets out of
sync due a HTTP replication request racing with the replication streams.

1 files changed, 1 insertions, 4 deletions

diff --git a/synapse/replication/http/login.py b/synapse/replication/http/login.py
index c68e18da12..6ad6cb1bfe 100644
--- a/synapse/replication/http/login.py
+++ b/synapse/replication/http/login.py
@@ -18,7 +18,6 @@ from typing import TYPE_CHECKING, Optional, Tuple, cast
 from twisted.web.server import Request
 
 from synapse.http.server import HttpServer
-from synapse.http.servlet import parse_json_object_from_request
 from synapse.replication.http._base import ReplicationEndpoint
 from synapse.types import JsonDict
 
@@ -73,10 +72,8 @@ class RegisterDeviceReplicationServlet(ReplicationEndpoint):
         }
 
     async def _handle_request(  # type: ignore[override]
-        self, request: Request, user_id: str
+        self, request: Request, content: JsonDict, user_id: str
     ) -> Tuple[int, JsonDict]:
-        content = parse_json_object_from_request(request)
-
         device_id = content["device_id"]
         initial_display_name = content["initial_display_name"]
         is_guest = content["is_guest"]