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Remove error spam when users query the keys of departed remote users (#13826)
The error message introduced in #13749 has turned out to be very spammy. Remove it for now.
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2 changed files with 13 additions and 9 deletions
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changelog.d/13826.bugfix
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changelog.d/13826.bugfix
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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.
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@ -188,18 +188,21 @@ class E2eKeysHandler:
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)
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invalid_cached_users = cached_users - valid_cached_users
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if invalid_cached_users:
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# Fix up results. If we get here, there is either a bug in device
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# list tracking, or we hit the race mentioned above.
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# Fix up results. If we get here, it means there was either a bug in
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# device list tracking, or we hit the race mentioned above.
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# TODO: In practice, this path is hit fairly often in existing
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# deployments when clients query the keys of departed remote
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# users. A background update to mark the appropriate device
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# lists as unsubscribed is needed.
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# https://github.com/matrix-org/synapse/issues/13651
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# Note that this currently introduces a failure mode when clients
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# are trying to decrypt old messages from a remote user whose
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# homeserver is no longer available. We may want to consider falling
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# back to the cached data when we fail to retrieve a device list
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# over federation for such remote users.
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user_ids_not_in_cache.update(invalid_cached_users)
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for invalid_user_id in invalid_cached_users:
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remote_results.pop(invalid_user_id)
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# This log message may be removed if it turns out it's almost
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# entirely triggered by races.
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logger.error(
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"Devices for %s were cached, but the server no longer shares "
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"any rooms with them. The cached device lists are stale.",
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invalid_cached_users,
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)
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for user_id, devices in remote_results.items():
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user_devices = results.setdefault(user_id, {})
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