Example of a compressed file-based cache store

Example of a compressed file cache store

ActiveSupport::Cache::FileStore.class_eval do      
  def read(name, options = nil)
    super
    File.open(real_file_path(name), 'rb') do |f| 
      gz = Zlib::GzipReader.new(f)
      value = Marshal.load(gz)
      gz.close
      value
    end
  rescue => e
    nil
  end

  def write(name, value, options = nil)
    super
    ensure_cache_path(File.dirname(real_file_path(name)))
    File.atomic_write(real_file_path(name), cache_path) do |f| 
      gz = Zlib::GzipWriter.new(f)
      Marshal.dump(value, gz) 
      gz.close
    end
    value
  rescue => e
    logger.error "Couldn't create cache directory: #{name} (#{e.message})" if logger
  end
  
  private
    def real_file_path(name)
      '%s/%s.cache.gz' % [@cache_path, name.gsub('?', '.').gsub(':', '.')]
    end
end