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/send_event.py b/synapse/replication/http/send_event.py

index 4215a1c1bc..27ad914075 100644
--- a/synapse/replication/http/send_event.py
+++ b/synapse/replication/http/send_event.py
@@ -21,7 +21,6 @@ from synapse.api.room_versions import KNOWN_ROOM_VERSIONS
 from synapse.events import EventBase, make_event_from_dict
 from synapse.events.snapshot import EventContext
 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, Requester, UserID
 from synapse.util.metrics import Measure
@@ -114,11 +113,9 @@ class ReplicationSendEventRestServlet(ReplicationEndpoint):
         return payload
 
     async def _handle_request(  # type: ignore[override]
-        self, request: Request, event_id: str
+        self, request: Request, content: JsonDict, event_id: str
     ) -> Tuple[int, JsonDict]:
         with Measure(self.clock, "repl_send_event_parse"):
-            content = parse_json_object_from_request(request)
-
             event_dict = content["event"]
             room_ver = KNOWN_ROOM_VERSIONS[content["room_version"]]
             internal_metadata = content["internal_metadata"]