vendor/rails/activesupport/lib/active_support/cache/file_store.rb

   1 module ActiveSupport
   2   module Cache
   3     # A cache store implementation which stores everything on the filesystem.
   4     class FileStore < Store
   5       attr_reader :cache_path
   6
   7       def initialize(cache_path)
   8         @cache_path = cache_path
   9       end
  10
  11       def read(name, options = nil)
  12         super
  13         File.open(real_file_path(name), 'rb') { |f| Marshal.load(f) } rescue nil
  14       end
  15
  16       def write(name, value, options = nil)
  17         super
  18         ensure_cache_path(File.dirname(real_file_path(name)))
  19         File.atomic_write(real_file_path(name), cache_path) { |f| Marshal.dump(value, f) }
  20         value
  21       rescue => e
  22         logger.error "Couldn't create cache directory: #{name} (#{e.message})" if logger
  23       end
  24
  25       def delete(name, options = nil)
  26         super
  27         File.delete(real_file_path(name))
  28       rescue SystemCallError => e
  29         # If there's no cache, then there's nothing to complain about
  30       end
  31
  32       def delete_matched(matcher, options = nil)
  33         super
  34         search_dir(@cache_path) do |f|
  35           if f =~ matcher
  36             begin
  37               File.delete(f)
  38             rescue SystemCallError => e
  39               # If there's no cache, then there's nothing to complain about
  40             end
  41           end
  42         end
  43       end
  44
  45       def exist?(name, options = nil)
  46         super
  47         File.exist?(real_file_path(name))
  48       end
  49
  50       private
  51         def real_file_path(name)
  52           '%s/%s.cache' % [@cache_path, name.gsub('?', '.').gsub(':', '.')]
  53         end
  54
  55         def ensure_cache_path(path)
  56           FileUtils.makedirs(path) unless File.exist?(path)
  57         end
  58
  59         def search_dir(dir, &callback)
  60           Dir.foreach(dir) do |d|
  61             next if d == "." || d == ".."
  62             name = File.join(dir, d)
  63             if File.directory?(name)
  64               search_dir(name, &callback)
  65             else
  66               callback.call name
  67             end
  68           end
  69         end
  70     end
  71   end
  72 end