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Faster Room Joins: prevent Synapse from answering federated join requests for a room which it has not fully joined yet. (#13416)

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reivilibre 2022-08-04 15:27:04 +00:00 committed by GitHub
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1
changelog.d/13416.misc Normal file
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@ -0,0 +1 @@
Faster Room Joins: prevent Synapse from answering federated join requests for a room which it has not fully joined yet.

17
synapse/federation/federation_server.py
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@ -843,8 +843,25 @@ class FederationServer(FederationBase):
Codes.BAD_JSON,
)
# Note that get_room_version throws if the room does not exist here.
room_version = await self.store.get_room_version(room_id)
if await self.store.is_partial_state_room(room_id):
# If our server is still only partially joined, we can't give a complete
# response to /send_join, /send_knock or /send_leave.
# This is because we will not be able to provide the server list (for partial
# joins) or the full state (for full joins).
# Return a 404 as we would if we weren't in the room at all.
logger.info(
f"Rejecting /send_{membership_type} to %s because it's a partial state room",
room_id,
)
raise SynapseError(
404,
f"Unable to handle /send_{membership_type} right now; this server is not fully joined.",
errcode=Codes.NOT_FOUND,
)
if membership_type == Membership.KNOCK and not room_version.msc2403_knocking:
raise SynapseError(
403,

17
synapse/handlers/federation.py
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@ -754,6 +754,23 @@ class FederationHandler:
# (and return a 404 otherwise)
room_version = await self.store.get_room_version(room_id)
if await self.store.is_partial_state_room(room_id):
# If our server is still only partially joined, we can't give a complete
# response to /make_join, so return a 404 as we would if we weren't in the
# room at all.
# The main reason we can't respond properly is that we need to know about
# the auth events for the join event that we would return.
# We also should not bother entertaining the /make_join since we cannot
# handle the /send_join.
logger.info(
"Rejecting /make_join to %s because it's a partial state room", room_id
)
raise SynapseError(
404,
"Unable to handle /make_join right now; this server is not fully joined.",
errcode=Codes.NOT_FOUND,
)
# now check that we are *still* in the room
is_in_room = await self._event_auth_handler.check_host_in_room(
room_id, self.server_name