1 |
joko |
1.6 |
## $Id: Checksum.pm,v 1.5 2004/05/11 19:43:02 joko Exp $ |
2 |
joko |
1.1 |
## |
3 |
|
|
## Copyright (c) 2002 Andreas Motl <andreas.motl@ilo.de> |
4 |
|
|
## |
5 |
|
|
## See COPYRIGHT section in pod text below for usage and distribution rights. |
6 |
|
|
## |
7 |
|
|
## ---------------------------------------------------------------------------------------- |
8 |
joko |
1.2 |
## $Log: Checksum.pm,v $ |
9 |
joko |
1.6 |
## Revision 1.5 2004/05/11 19:43:02 joko |
10 |
|
|
## don't use File::RsyncP::Digest on win32 |
11 |
|
|
## |
12 |
joko |
1.5 |
## Revision 1.4 2004/05/06 12:53:07 jonen |
13 |
|
|
## + added use of File::RsycP::digest |
14 |
|
|
## |
15 |
jonen |
1.4 |
## Revision 1.3 2003/05/13 08:19:00 joko |
16 |
|
|
## switched to crc32 |
17 |
|
|
## |
18 |
joko |
1.3 |
## Revision 1.2 2003/02/11 09:53:07 joko |
19 |
|
|
## + metadata-structure-change, fixed some code here |
20 |
|
|
## |
21 |
joko |
1.2 |
## Revision 1.1 2003/02/09 05:10:13 joko |
22 |
|
|
## + initial commit |
23 |
|
|
## |
24 |
joko |
1.1 |
## ---------------------------------------------------------------------------------------- |
25 |
|
|
|
26 |
|
|
|
27 |
joko |
1.3 |
=pod |
28 |
|
|
|
29 |
|
|
=head1 Todo |
30 |
|
|
|
31 |
|
|
o Data::Transfer::Sync::Compare::Slot using Compare::Struct |
32 |
joko |
1.5 |
o Load checksum algorithm on demand, do some negotiation |
33 |
joko |
1.3 |
|
34 |
|
|
=cut |
35 |
|
|
|
36 |
joko |
1.1 |
package Data::Transfer::Sync::Compare::Checksum; |
37 |
|
|
|
38 |
|
|
use strict; |
39 |
|
|
use warnings; |
40 |
|
|
|
41 |
|
|
use mixin::with qw( Data::Transfer::Sync ); |
42 |
|
|
|
43 |
joko |
1.5 |
use shortcuts qw( RUNNING_IN_HELL ); |
44 |
joko |
1.1 |
use Data::Dumper; |
45 |
|
|
|
46 |
joko |
1.3 |
# TODO: Load these appropriatly at runtime. |
47 |
|
|
use Digest::MD5 qw( md5 md5_hex md5_base64 ); |
48 |
|
|
use String::CRC32; |
49 |
joko |
1.6 |
use Data::Mungle::Transform::Deep qw( deep_copy ); |
50 |
joko |
1.5 |
|
51 |
|
|
# don't use File::RsyncP::Digest on win32 |
52 |
|
|
# TODO: enhance here! (e.g. negotiate proper checksum-algorithm first, apply afterwards) |
53 |
|
|
if (not RUNNING_IN_HELL()) { |
54 |
|
|
eval "use File::RsyncP::Digest;"; |
55 |
|
|
} |
56 |
joko |
1.1 |
|
57 |
|
|
# get logger instance |
58 |
|
|
my $logger = Log::Dispatch::Config->instance; |
59 |
|
|
|
60 |
|
|
|
61 |
joko |
1.3 |
# Maybe refactor to shortcuts::checksum? |
62 |
joko |
1.6 |
# calculate checksum for current object |
63 |
joko |
1.1 |
sub _calcChecksum { |
64 |
|
|
|
65 |
|
|
my $self = shift; |
66 |
|
|
my $descent = shift; |
67 |
joko |
1.6 |
my $options = shift; |
68 |
joko |
1.1 |
|
69 |
joko |
1.6 |
my $checksum; |
70 |
|
|
|
71 |
joko |
1.1 |
my $ident = $self->{node}->{$descent}->{ident}; |
72 |
|
|
|
73 |
|
|
# build dump of this node |
74 |
|
|
my $payload = $self->{node}->{$descent}->{payload}; |
75 |
joko |
1.6 |
$payload = deep_copy($payload) if $options->{clone}; |
76 |
|
|
|
77 |
|
|
# new 2004-06-17: remove attributes if request before dumping/calculating |
78 |
|
|
map { delete $payload->{$_} } @{$options->{exclude}} if $options->{exclude}; |
79 |
|
|
|
80 |
|
|
# various methods to dump this thing |
81 |
joko |
1.1 |
#my $dump = $ident . "\n" . $item->quickdump(); |
82 |
|
|
#my $dump = $ident . "\n" . Dumper($item); |
83 |
joko |
1.6 |
my $dump = $self->_dumpCompact($payload); |
84 |
|
|
$dump = $ident . $dump if $self->{options}->{ident}; |
85 |
joko |
1.1 |
|
86 |
|
|
# TODO: $logger->dump( ... ); |
87 |
|
|
#$logger->debug( __PACKAGE__ . ": " . $dump ); |
88 |
|
|
#$logger->dump( __PACKAGE__ . ": " . $dump ); |
89 |
|
|
|
90 |
|
|
# calculate checksum from dump |
91 |
joko |
1.3 |
|
92 |
|
|
# 1. md5-based fingerprint, base64 encoded (from Digest::MD5) |
93 |
joko |
1.6 |
#$checksum = md5_base64($dump) . '=='; |
94 |
joko |
1.3 |
|
95 |
|
|
# 2. 32-bit integer "hash" value (maybe faster?) (from DBI) |
96 |
|
|
# Note: The 32-bit integer hash from DBI seems to generate duplicates |
97 |
|
|
# with small payloads already in ranges of hundreds of items/rows!!! |
98 |
|
|
# Try to avoid it or try to use it only for payloads greater than, hmmm, let's say 30 chars? |
99 |
|
|
# (we had about 15 chars average per item (row)) |
100 |
joko |
1.5 |
# Possible (generic) solution: Just generate checksum, if length(checksum(payload)) < length(payload) |
101 |
joko |
1.6 |
#$checksum = DBI::hash($dump, 1); |
102 |
joko |
1.3 |
|
103 |
joko |
1.5 |
# 3. good old crc32??? |
104 |
joko |
1.6 |
#$checksum = crc32($dump); |
105 |
joko |
1.3 |
|
106 |
jonen |
1.4 |
# 4. File::RsyncP::Digest - Perl interface to rsync message digest algorithms |
107 |
joko |
1.5 |
if (not RUNNING_IN_HELL()) { |
108 |
jonen |
1.4 |
my $rsDigest = new File::RsyncP::Digest; |
109 |
|
|
$rsDigest->add($dump); |
110 |
|
|
my $digest = $rsDigest->digest(); |
111 |
joko |
1.6 |
$checksum = unpack("H*", $digest); |
112 |
joko |
1.5 |
|
113 |
|
|
} else { # fallback to Digest::MD5 on win32 |
114 |
joko |
1.6 |
#print $dump, " ==> "; |
115 |
|
|
$checksum = md5_base64($dump) . '=='; |
116 |
|
|
#print $checksum, "\n"; |
117 |
joko |
1.5 |
} |
118 |
jonen |
1.4 |
|
119 |
|
|
# 5. some more modern Digest::SHA1 or similar? |
120 |
joko |
1.1 |
|
121 |
|
|
# signal good |
122 |
joko |
1.6 |
return $checksum; |
123 |
joko |
1.1 |
|
124 |
|
|
} |
125 |
|
|
|
126 |
|
|
|
127 |
joko |
1.6 |
sub readChecksum { |
128 |
joko |
1.1 |
my $self = shift; |
129 |
|
|
|
130 |
|
|
my $descent = shift; |
131 |
|
|
|
132 |
|
|
# signal checksum bad |
133 |
|
|
if (!$self->{node}->{$descent}) { |
134 |
|
|
return; |
135 |
|
|
} |
136 |
|
|
|
137 |
|
|
# trace |
138 |
|
|
#print "desc: $descent", "\n"; |
139 |
|
|
#print Dumper($self); |
140 |
joko |
1.2 |
#print Dumper($self->{meta}->{$descent}); |
141 |
joko |
1.1 |
#exit; |
142 |
|
|
|
143 |
|
|
# get checksum for current entry |
144 |
|
|
# TODO: don't have the checksum column/property hardcoded as "cs" here, make this configurable somehow |
145 |
joko |
1.2 |
if ($self->{meta}->{$descent}->{isChecksumAuthority}) { |
146 |
joko |
1.6 |
$self->{node}->{$descent}->{checksum} = $self->_calcChecksum($descent, { ident => 1 }); |
147 |
joko |
1.1 |
} else { |
148 |
|
|
$self->{node}->{$descent}->{checksum} = $self->{node}->{$descent}->{payload}->{cs}; |
149 |
|
|
} |
150 |
|
|
|
151 |
|
|
# signal checksum good |
152 |
|
|
return 1; |
153 |
|
|
|
154 |
|
|
} |
155 |
|
|
|
156 |
joko |
1.6 |
sub _readLocalChecksum { |
157 |
|
|
my $self = shift; |
158 |
|
|
my $descent = shift; |
159 |
|
|
$self->{node}->{$descent}->{checksum_local_storage} = $self->{node}->{$descent}->{payload}->{cs_local}; |
160 |
|
|
$self->{node}->{$descent}->{checksum_local_storage} ||= ""; |
161 |
|
|
} |
162 |
|
|
|
163 |
|
|
sub _calcLocalChecksum { |
164 |
|
|
my $self = shift; |
165 |
|
|
my $descent = shift; |
166 |
|
|
# TODO: don't hardcode this (oid, cs, cs_local) |
167 |
|
|
$self->{node}->{$descent}->{checksum_local_calculated} = |
168 |
|
|
$self->_calcChecksum($descent, { clone => 1, exclude => [qw( oid cs cs_local )] }); |
169 |
|
|
$self->{node}->{$descent}->{checksum_local_calculated} ||= ""; |
170 |
|
|
} |
171 |
|
|
|
172 |
|
|
sub handleLocalChecksum { |
173 |
|
|
my $self = shift; |
174 |
|
|
my $descent = shift; |
175 |
|
|
$self->_readLocalChecksum($descent); |
176 |
|
|
$self->_calcLocalChecksum($descent); |
177 |
|
|
} |
178 |
|
|
|
179 |
|
|
sub _dumpCompact { |
180 |
|
|
my $self = shift; |
181 |
|
|
|
182 |
|
|
my @data = (); |
183 |
|
|
|
184 |
|
|
my $count = 0; |
185 |
|
|
|
186 |
|
|
# walk through all arguments |
187 |
|
|
foreach (@_) { |
188 |
|
|
my $item = {}; |
189 |
|
|
# assume item is a hashref and walk through all entries |
190 |
|
|
foreach my $key (keys %$_) { |
191 |
|
|
my $val = $_->{$key}; |
192 |
|
|
# dive into tied/hidden types and resolve deep structure inside |
193 |
|
|
if (ref $val eq 'Set::Object') { |
194 |
|
|
$item->{$key} = $val->members(); |
195 |
|
|
} else { |
196 |
|
|
$item->{$key} = $val; |
197 |
|
|
} |
198 |
|
|
} |
199 |
|
|
push @data, $item; |
200 |
|
|
$count++; |
201 |
|
|
} |
202 |
|
|
|
203 |
|
|
my $indent_save = $Data::Dumper::Indent; |
204 |
|
|
$Data::Dumper::Indent = 0; |
205 |
|
|
my $result = Dumper(@data); |
206 |
|
|
$Data::Dumper::Indent = $indent_save; |
207 |
|
|
return $result; |
208 |
|
|
|
209 |
|
|
} |
210 |
joko |
1.1 |
|
211 |
|
|
1; |
212 |
joko |
1.3 |
__END__ |