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Fix federated joins when the first server in the list is not in the room (#15074)

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Previously we would give up upon receiving a 404 from the first server,
instead of trying the rest of the servers in the list.

Signed-off-by: Sean Quah <seanq@matrix.org>
This commit is contained in:
Sean Quah 2023-02-15 13:59:06 +00:00 committed by GitHub
parent 39795b3a4e
commit 3ad817bfe5
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2 changed files with 6 additions and 6 deletions
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1
changelog.d/15074.bugfix Normal file
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@ -0,0 +1 @@
Fix a long-standing bug where federated joins would fail if the first server in the list of servers to try is not in the room.

11
synapse/federation/federation_client.py
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@ -884,7 +884,7 @@ class FederationClient(FederationBase):
if 500 <= e.code < 600:
failover = True
elif e.code == 400 and synapse_error.errcode in failover_errcodes:
elif 400 <= e.code < 500 and synapse_error.errcode in failover_errcodes:
failover = True
elif failover_on_unknown_endpoint and self._is_unknown_endpoint(
@ -999,14 +999,13 @@ class FederationClient(FederationBase):
return destination, ev, room_version
failover_errcodes = {Codes.NOT_FOUND}
# MSC3083 defines additional error codes for room joins. Unfortunately
# we do not yet know the room version, assume these will only be returned
# by valid room versions.
failover_errcodes = (
(Codes.UNABLE_AUTHORISE_JOIN, Codes.UNABLE_TO_GRANT_JOIN)
if membership == Membership.JOIN
else None
)
if membership == Membership.JOIN:
failover_errcodes.add(Codes.UNABLE_AUTHORISE_JOIN)
failover_errcodes.add(Codes.UNABLE_TO_GRANT_JOIN)
return await self._try_destination_list(
"make_" + membership,