class Aws::Structure

def to_h(obj = self)
  case obj
  when Struct
    obj.members.each.with_object({}) do |member, hash|
      value = obj[member]
      hash[member] = to_hash(value) unless value.nil?
    end
  when Hash
    obj.each.with_object({}) do |(key, value), hash|
      hash[key] = to_hash(value)
    end
  when Array
    obj.collect { |value| to_hash(value) }
  else
    obj
  end
end