NAME

Cache::Memcached::Fast::Safe - Cache::Memcached::Fast with sanitizing keys and fork-safe

SYNOPSIS

  use Cache::Memcached::Fast::Safe;
  
  my $memd = Cache::Memcached::Fast::Safe->new({
    servers => [..]
  });
  
  #This module supports all method that Cache::Memcached::Fast has.

DESCRIPTION

Cache::Memcached::Fast::Safe is subclass of Cache::Memcached::Fast. Cache::Memcached::Fast::Safe sanitizes all requested keys for against memcached injection problem. and call disconnect_all automatically after fork for fork-safe.

ADDITIONAL METHOD

get_or_set($key:Str, $callback:CodeRef [,$expires:Num])

Get a cache value for $key if it's already cached. If can not retrieve cache values, execute $callback and cache with $expires seconds.

  $memcached->get_or_set('key:941',sub {
    DB->retrieve(941)
  },10);

callback can also return expires sec.

  $memcached->get_or_set('key:941',sub {
    my $val = DB->retrieve(941);
    return ($val, 10)
  });

CUSTOMIZE Sanitizer

This module allow to change sanitizing behavior through $Cache::Memcached::Fast::Safe::SANITIZE_METHOD. Default sanitizer is

  use bytes;
  my %escapes = map { chr($_) => sprintf('%%%02X', $_) } (0x00..0x20, 0x7f..0xff);
  local $Cache::Memcached::Fast::Safe::SANITIZE_METHOD = sub {
      my $key = shift;
      $key =~ s/([\x00-\x20\x7f-\xff])/$escapes{$1}/ge;
      if ( length $key > 200 ) {
          $key = sha1_hex($key);
      }
      $key;
  };

AUTHOR

Masahiro Nagano <kazeburo {at} gmail.com>

SEE ALSO

Cache::Memcached::Fast, http://gihyo.jp/dev/feature/01/memcached_advanced/0002 (Japanese)

LICENSE

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.