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package Cache::Memcached::Fast::Safe;
use strict;
use warnings;
use Cache::Memcached::Fast 0.19;
use Digest::SHA qw/sha1_hex/;
use parent qw/Cache::Memcached::Fast/;
use POSIX::AtFork;
use Scalar::Util qw/weaken/;
our $VERSION = '0.06';
our $SANITIZE_METHOD = \&_sanitize_method;
{
use bytes;
my %escapes = map { chr($_) => sprintf('%%%02X', $_) } (0x00..0x20, 0x7f..0xff);
sub _sanitize_method {
my $key = shift;
$key =~ s/([\x00-\x20\x7f-\xff])/$escapes{$1}/ge;
if ( length $key > 200 ) {
$key = sha1_hex($key);
}
$key;
}
}
sub new {
my $class = shift;
my %args = ref $_[0] ? %{$_[0]} : @_;
my $mem = $class->SUPER::new(\%args);
# fork safe
weaken(my $mem_weaken = $mem);
POSIX::AtFork->add_to_child(sub {
eval { $mem_weaken->disconnect_all };
});
$mem;
}
for my $method ( qw/set cas add replace append prepend incr decr delete touch/ ) {
no strict 'refs';
my $super = 'SUPER::'.$method;
*{$method} = sub {
my $self = shift;
my $key = shift;
$self->$super($SANITIZE_METHOD->($key), @_);
};
}
for my $method (qw/set_multi cas_multi add_multi replace_multi append_multi prepend_multi incr_multi decr_multi delete_multi touch_multi/ ) {
no strict 'refs';
my $super = 'SUPER::'.$method;
*{$method} = sub {
my $self = shift;
my @request = @_;
my @request_keys;
my %sanitized_keys;
my @sanitized_request;
for my $keyval (@request) {
my $key;
my $sanitized_key;
my $sanitized_keyval;
if ( ref $keyval ) {
my @keyval = @$keyval;
$key = shift @keyval;
$sanitized_key = $SANITIZE_METHOD->($key);
$sanitized_keyval = [$sanitized_key, @keyval];
}
else {
$key = $keyval;
$sanitized_key = $SANITIZE_METHOD->($key);
$sanitized_keyval = $sanitized_key
}
$sanitized_keys{$sanitized_key} = $key;
push @request_keys, $key;
push @sanitized_request, $sanitized_keyval;
}
my $sanitized_result = $self->$super(@sanitized_request);
my %result;
for my $key ( keys %$sanitized_result ) {
$result{$sanitized_keys{$key}} = $sanitized_result->{$key};
}
if ( wantarray ) {
my @result;
for my $key ( @request_keys ) {
push @result, $result{$key};
}
return @result;
}
\%result;
}
}
*remove = \&delete;
for my $method (qw/get gets/) {
no strict 'refs';
my $super = 'SUPER::'.$method;
*{$method} = sub {
my $self = shift;
my $key = shift;
$self->$super($SANITIZE_METHOD->($key));
};
}
for my $method (qw/get_multi gets_multi/) {
no strict 'refs';
my $super = 'SUPER::'.$method;
*{$method} = sub {
my $self = shift;
my @request;
my %sanitized_keys;
for my $key (@_) {
my $sanitized_key = $SANITIZE_METHOD->($key);
$sanitized_keys{$sanitized_key} = $key;
push @request, $sanitized_key;
}
return {} if ! @request;
my $sanitized_result = $self->$super(@request);
my %result;
for my $key ( keys %$sanitized_result ) {
$result{$sanitized_keys{$key}} = $sanitized_result->{$key};
}
\%result;
}
}
sub get_or_set {
my($self, $key, $sub, $expire) = @_;
if (my $value = $self->get($key)) {
return $value;
}
my ($value, $ret_expire) = $sub->();
$self->set($key, $value, $expire || $ret_expire);
$value;
}
1;
__END__
=head1 NAME
Cache::Memcached::Fast::Safe - Cache::Memcached::Fast with sanitizing keys and fork-safe
=head1 SYNOPSIS
use Cache::Memcached::Fast::Safe;
my $memd = Cache::Memcached::Fast::Safe->new({
servers => [..]
});
#This module supports all method that Cache::Memcached::Fast has.
=head1 DESCRIPTION
Cache::Memcached::Fast::Safe is subclass of L<Cache::Memcached::Fast>.
Cache::Memcached::Fast::Safe sanitizes all requested keys for against
memcached injection problem. and call disconnect_all automatically after fork
for fork-safe.
=head1 ADDITIONAL METHOD
=over 4
=item get_or_set($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)
});
=back
=head1 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;
};
=head1 AUTHOR
Masahiro Nagano E<lt>kazeburo {at} gmail.comE<gt>
=head1 SEE ALSO
L<Cache::Memcached::Fast>, L<http://gihyo.jp/dev/feature/01/memcached_advanced/0002> (Japanese)
=head1 LICENSE
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
=cut
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