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1 | |
2 | package MooseX::Storage::Base::WithChecksum; |
3 | use Moose::Role; |
4 | |
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5 | use Digest (); |
6 | use Storable (); |
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7 | use MooseX::Storage::Engine; |
8 | |
9 | our $VERSION = '0.01'; |
10 | |
11 | sub pack { |
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12 | my ($self, @args ) = @_; |
13 | |
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14 | my $e = MooseX::Storage::Engine->new( object => $self ); |
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15 | |
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16 | my $collapsed = $e->collapse_object; |
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17 | |
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18 | $collapsed->{__DIGEST__} = $self->_digest_packed($collapsed, @args); |
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19 | |
20 | return $collapsed; |
21 | } |
22 | |
23 | sub unpack { |
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24 | my ($class, $data, @args) = @_; |
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25 | |
26 | # check checksum on data |
27 | |
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28 | my $old_checksum = $data->{__DIGEST__}; |
29 | delete $data->{__DIGEST__}; |
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30 | |
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31 | my $checksum = $class->_digest_packed($data, @args); |
32 | |
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33 | ($checksum eq $old_checksum) |
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34 | || confess "Bad Checksum got=($checksum) expected=($old_checksum)"; |
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35 | |
36 | my $e = MooseX::Storage::Engine->new(class => $class); |
37 | $class->new($e->expand_object($data)); |
38 | } |
39 | |
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40 | |
41 | sub _digest_packed { |
42 | my ( $self, $collapsed, @args ) = @_; |
43 | |
44 | my $d = shift @args; |
45 | |
46 | if ( ref $d ) { |
47 | if ( $d->can("clone") ) { |
48 | $d = $d->clone; |
49 | } elsif ( $d->can("reset") ) { |
50 | $d->reset; |
51 | } else { |
52 | die "Can't clone or reset digest object: $d"; |
53 | } |
54 | } else { |
55 | $d = Digest->new($d || "SHA1", @args); |
56 | } |
57 | |
58 | { |
59 | local $Storable::canonical = 1; |
60 | $d->add( Storable::nfreeze($collapsed) ); |
61 | } |
62 | |
63 | return $d->hexdigest; |
64 | } |
65 | |
66 | |
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67 | 1; |
68 | |
69 | __END__ |
70 | |
71 | =pod |
72 | |
73 | =head1 NAME |
74 | |
75 | MooseX::Storage::Base::WithChecksum |
76 | |
77 | =head1 SYNOPSIS |
78 | |
79 | =head1 DESCRIPTION |
80 | |
81 | =head1 METHODS |
82 | |
83 | =over 4 |
84 | |
85 | =item B<pack (?$salt)> |
86 | |
87 | =item B<unpack ($data, ?$salt)> |
88 | |
89 | =back |
90 | |
91 | =head2 Introspection |
92 | |
93 | =over 4 |
94 | |
95 | =item B<meta> |
96 | |
97 | =back |
98 | |
99 | =head1 BUGS |
100 | |
101 | All complex software has bugs lurking in it, and this module is no |
102 | exception. If you find a bug please either email me, or add the bug |
103 | to cpan-RT. |
104 | |
105 | =head1 AUTHOR |
106 | |
107 | Stevan Little E<lt>stevan.little@iinteractive.comE<gt> |
108 | |
109 | =head1 COPYRIGHT AND LICENSE |
110 | |
111 | Copyright 2007 by Infinity Interactive, Inc. |
112 | |
113 | L<http://www.iinteractive.com> |
114 | |
115 | This library is free software; you can redistribute it and/or modify |
116 | it under the same terms as Perl itself. |
117 | |
118 | =cut |