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Remove error spam when users query the keys of departed remote users (#13826)

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The error message introduced in #13749 has turned out to be very spammy.
Remove it for now.
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Sean Quah 2022-09-16 16:16:05 +01:00 committed by GitHub
parent 384dca53d6
commit d64e85197a
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2 changed files with 13 additions and 9 deletions
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changelog.d/13826.bugfix Normal file
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@ -0,0 +1 @@
Fix a long standing bug where device lists would remain cached when remote users left and rejoined the last room shared with the local homeserver.

21
synapse/handlers/e2e_keys.py
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@ -188,18 +188,21 @@ class E2eKeysHandler:
)
invalid_cached_users = cached_users - valid_cached_users
if invalid_cached_users:
# Fix up results. If we get here, there is either a bug in device
# list tracking, or we hit the race mentioned above.
# Fix up results. If we get here, it means there was either a bug in
# device list tracking, or we hit the race mentioned above.
# TODO: In practice, this path is hit fairly often in existing
# deployments when clients query the keys of departed remote
# users. A background update to mark the appropriate device
# lists as unsubscribed is needed.
# https://github.com/matrix-org/synapse/issues/13651
# Note that this currently introduces a failure mode when clients
# are trying to decrypt old messages from a remote user whose
# homeserver is no longer available. We may want to consider falling
# back to the cached data when we fail to retrieve a device list
# over federation for such remote users.
user_ids_not_in_cache.update(invalid_cached_users)
for invalid_user_id in invalid_cached_users:
remote_results.pop(invalid_user_id)
# This log message may be removed if it turns out it's almost
# entirely triggered by races.
logger.error(
"Devices for %s were cached, but the server no longer shares "
"any rooms with them. The cached device lists are stale.",
invalid_cached_users,
)
for user_id, devices in remote_results.items():
user_devices = results.setdefault(user_id, {})