SimpleFileCaching.rb

module Cache
    def Cache.file(filename, cache_lifetime=604800)
        if File.exists?(filename)
            if File.mtime(filename) < (Time.now - cache_lifetime)
                body = yield
                File.open(filename, 'w') do |file|
                    file << body.to_yaml
                end
                return body
            else
                return YAML::load(File.open(filename, 'r').read)
            end
        else
            body = yield
            File.open(filename, 'w') do |file|
                file << body.to_yaml
            end
            return body
        end
    end
end

# Example usage
# =============

Test = Cache.file('test.yml') do 
    Blood::get_dns_of(me)
end