class Redis::Cluster

def fetch_cluster_info!(option)
  node = Node.new(option.per_node_key)
  available_slots = SlotLoader.load(node)
  node_flags = NodeLoader.load_flags(node)
  option.update_node(available_slots.keys.map { |k| NodeKey.optionize(k) })
  [Node.new(option.per_node_key, node_flags, option.use_replica?),
   Slot.new(available_slots, node_flags, option.use_replica?)]
ensure
  node&.each(&:disconnect)
end