Rename maybe_store_room_on_{invite,outlier_membership}

There's a handy function called maybe_store_room_on_invite which allows us to
create an entry in the rooms table for a room and its version for which we
aren't joined to yet, but we can reference when ingesting events about.

This is currently used for invites where we receive some stripped state about
the room and pass it down via /sync to the client, without us being in the
room yet.

There is a similar requirement for knocking, where we will eventually do the
same thing, and need an entry in the rooms table as well. Thus, reusing this
function works, however its name needs to be generalised a bit.

So that is what this commit does.

synapse/handlers/federation.py

@@ -67,7 +67,7 @@ from synapse.replication.http.devices import ReplicationUserDevicesResyncRestSer
 from synapse.replication.http.federation import (
     ReplicationCleanRoomRestServlet,
     ReplicationFederationSendEventsRestServlet,
-    ReplicationStoreRoomOnInviteRestServlet,
+    ReplicationStoreRoomOnOutlierMembershipRestServlet,
 )
 from synapse.state import StateResolutionStore
 from synapse.storage.databases.main.events_worker import EventRedactBehaviour
@@ -152,12 +152,14 @@ class FederationHandler(BaseHandler):
             self._user_device_resync = ReplicationUserDevicesResyncRestServlet.make_client(
                 hs
             )
-            self._maybe_store_room_on_invite = ReplicationStoreRoomOnInviteRestServlet.make_client(
+            self._maybe_store_room_on_outlier_membership = ReplicationStoreRoomOnOutlierMembershipRestServlet.make_client(
                 hs
             )
         else:
             self._device_list_updater = hs.get_device_handler().device_list_updater
-            self._maybe_store_room_on_invite = self.store.maybe_store_room_on_invite
+            self._maybe_store_room_on_outlier_membership = (
+                self.store.maybe_store_room_on_outlier_membership
+            )
 
         # When joining a room we need to queue any events for that room up.
         # For each room, a list of (pdu, origin) tuples.
@@ -1617,7 +1619,7 @@ class FederationHandler(BaseHandler):
         # keep a record of the room version, if we don't yet know it.
         # (this may get overwritten if we later get a different room version in a
         # join dance).
-        await self._maybe_store_room_on_invite(
+        await self._maybe_store_room_on_outlier_membership(
             room_id=event.room_id, room_version=room_version
         )
 

synapse/replication/http/federation.py

@@ -254,20 +254,20 @@ class ReplicationCleanRoomRestServlet(ReplicationEndpoint):
         return 200, {}
 
 
-class ReplicationStoreRoomOnInviteRestServlet(ReplicationEndpoint):
+class ReplicationStoreRoomOnOutlierMembershipRestServlet(ReplicationEndpoint):
     """Called to clean up any data in DB for a given room, ready for the
     server to join the room.
 
     Request format:
 
-        POST /_synapse/replication/store_room_on_invite/:room_id/:txn_id
+        POST /_synapse/replication/store_room_on_outlier_membership/:room_id/:txn_id
 
         {
             "room_version": "1",
         }
     """
 
-    NAME = "store_room_on_invite"
+    NAME = "store_room_on_outlier_membership"
     PATH_ARGS = ("room_id",)
 
     def __init__(self, hs):
@@ -282,7 +282,7 @@ class ReplicationStoreRoomOnInviteRestServlet(ReplicationEndpoint):
     async def _handle_request(self, request, room_id):
         content = parse_json_object_from_request(request)
         room_version = KNOWN_ROOM_VERSIONS[content["room_version"]]
-        await self.store.maybe_store_room_on_invite(room_id, room_version)
+        await self.store.maybe_store_room_on_outlier_membership(room_id, room_version)
         return 200, {}
 
 
@@ -291,4 +291,4 @@ def register_servlets(hs, http_server):
     ReplicationFederationSendEduRestServlet(hs).register(http_server)
     ReplicationGetQueryRestServlet(hs).register(http_server)
     ReplicationCleanRoomRestServlet(hs).register(http_server)
-    ReplicationStoreRoomOnInviteRestServlet(hs).register(http_server)
+    ReplicationStoreRoomOnOutlierMembershipRestServlet(hs).register(http_server)

synapse/storage/databases/main/room.py

@@ -1240,13 +1240,16 @@ class RoomStore(RoomBackgroundUpdateStore, RoomWorkerStore, SearchStore):
             logger.error("store_room with room_id=%s failed: %s", room_id, e)
             raise StoreError(500, "Problem creating room.")
 
-    async def maybe_store_room_on_invite(self, room_id: str, room_version: RoomVersion):
+    async def maybe_store_room_on_outlier_membership(
+        self, room_id: str, room_version: RoomVersion
+    ):
         """
-        When we receive an invite over federation, store the version of the room if we
-        don't already know the room version.
+        When we receive an invite, a knock or any other event over federation that may relate
+        to a room we are not in, store the version of the room if we don't already know the
+        room version.
         """
         await self.db_pool.simple_upsert(
-            desc="maybe_store_room_on_invite",
+            desc="maybe_store_room_on_outlier_membership",
             table="rooms",
             keyvalues={"room_id": room_id},
             values={},