require 'active_support/core_ext/file/atomic' module ActiveSupport module Cache # A cache store implementation which stores everything on the filesystem. class FileStore < Store attr_reader :cache_path def initialize(cache_path) @cache_path = cache_path end def read(name, options = nil) super File.open(real_file_path(name), 'rb') { |f| Marshal.load(f) } rescue 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) { |f| Marshal.dump(value, f) } value rescue => e logger.error "Couldn't create cache directory: #{name} (#{e.message})" if logger end def delete(name, options = nil) super File.delete(real_file_path(name)) rescue SystemCallError => e # If there's no cache, then there's nothing to complain about end def delete_matched(matcher, options = nil) super search_dir(@cache_path) do |f| if f =~ matcher begin File.delete(f) rescue SystemCallError => e # If there's no cache, then there's nothing to complain about end end end end def exist?(name, options = nil) super File.exist?(real_file_path(name)) end private def real_file_path(name) '%s/%s.cache' % [@cache_path, name.gsub('?', '.').gsub(':', '.')] end def ensure_cache_path(path) FileUtils.makedirs(path) unless File.exist?(path) end def search_dir(dir, &callback) Dir.foreach(dir) do |d| next if d == "." || d == ".." name = File.join(dir, d) if File.directory?(name) search_dir(name, &callback) else callback.call name end end end end end end