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1 | package DBIx::Class::Journal; |
2 | |
3 | use base qw/DBIx::Class/; |
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4 | |
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5 | use strict; |
6 | use warnings; |
7 | |
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8 | our $VERSION = '0.900001_04'; |
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9 | $VERSION = eval $VERSION; # no errors in dev versions |
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10 | |
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11 | ## On create/insert, add new entry to AuditLog and new content to AuditHistory |
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12 | |
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13 | sub _journal_schema { |
14 | my $self = shift; |
15 | $self->result_source->schema->_journal_schema; |
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16 | } |
17 | |
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18 | sub insert { |
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19 | my ($self, @args) = @_; |
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20 | return if $self->in_storage; |
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21 | |
22 | my $res = $self->next::method(@args); |
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23 | $self->journal_log_insert; |
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24 | |
c5fba518 |
25 | return $res; |
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26 | } |
27 | |
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28 | sub journal_log_insert { |
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29 | my ($self) = @_; |
30 | |
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31 | if ( $self->in_storage ) { |
32 | my $j = $self->_journal_schema; |
33 | my $change_id = $j->journal_create_change()->id; |
34 | $j->journal_update_or_create_log_entry( $self, create_id => $change_id ); |
35 | $j->journal_record_in_history( $self, audit_change_id => $change_id ); |
36 | } |
6bfb7a1d |
37 | } |
38 | |
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39 | ## On delete, update delete_id of AuditLog |
40 | |
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41 | sub delete { |
42 | my $self = shift; |
43 | $self->next::method(@_); |
44 | $self->journal_log_delete(@_); |
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45 | } |
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46 | |
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47 | sub journal_log_delete { |
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48 | my ($self) = @_; |
49 | |
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50 | unless ($self->in_storage) { |
51 | my $j = $self->_journal_schema; |
52 | $j->journal_update_or_create_log_entry( $self, delete_id => $j->journal_create_change->id ); |
53 | } |
1e996809 |
54 | } |
55 | |
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56 | ## On update, copy row's new contents to AuditHistory |
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57 | |
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58 | sub update { |
59 | my $self = shift; |
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60 | $self->next::method(@_); |
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61 | $self->journal_log_update(@_); |
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62 | } |
63 | |
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64 | sub journal_log_update { |
65 | my $self = shift; |
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66 | |
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67 | if ($self->in_storage) { |
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68 | my $j = $self->_journal_schema; |
e0a0e192 |
69 | my $change_id = $j->journal_create_change->id; |
3ef10e31 |
70 | $j->journal_record_in_history( $self, audit_change_id => $change_id ); |
1e996809 |
71 | } |
1e996809 |
72 | } |
73 | |
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74 | =head1 NAME |
75 | |
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76 | DBIx::Class::Journal - Auditing for tables managed by DBIx::Class |
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77 | |
78 | =head1 SYNOPSIS |
79 | |
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80 | package My::Schema; |
81 | use base 'DBIx::Class::Schema'; |
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82 | |
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83 | __PACKAGE__->load_components(qw/Schema::Journal/); |
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84 | |
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85 | And then call C<< $schema->journal_schema_deploy >> to create all the tables |
86 | necessary for the journal, in your database. |
87 | |
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88 | Optionally set where the journal is stored: |
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89 | |
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90 | __PACKAGE__->journal_connection(['dbi:SQLite:t/var/Audit.db']); |
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91 | |
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92 | Later on, in your application, wrap operations in transactions, and optionally |
93 | associate a user with the changeset: |
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94 | |
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95 | $schema->changeset_user($user->id); |
96 | my $new_artist = $schema->txn_do( sub { |
97 | return $schema->resultset('Artist')->create({ name => 'Fred' }); |
98 | }); |
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99 | |
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100 | =head1 DESCRIPTION |
101 | |
102 | The purpose of this L<DBIx::Class> component module is to create an |
103 | audit-trail for all changes made to the data in your database (via a |
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104 | DBIx::Class schema). It creates I<changesets> and assigns each |
105 | create/update/delete operation an I<id>. The creation and deletion date of |
106 | each row is stored, as well as the historical contents of any row that gets |
107 | changed. |
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108 | |
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109 | All queries which need auditing must be called using |
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110 | L<DBIx::Class::Schema/txn_do>, which is used to create changesets for each |
111 | transaction. |
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112 | |
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113 | To track who did which changes, the C<user_id> (an integer) of the current |
114 | user can be set, and a C<session_id> can also be set; both are optional. |
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115 | |
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116 | To access the auditing schema to look at the auditdata or revert a change, use |
117 | C<< $schema->_journal_schema >>. |
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118 | |
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119 | =head1 DEPLOYMENT |
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120 | |
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121 | Currently the module expects to be deployed alongside a new database schema, |
122 | and track all changes from first entry. Do do that you need to add some tables |
123 | for the journal, and you can configure which tables have their operations |
124 | journalled by the module. |
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125 | |
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126 | Connect to your schema and deploy the journal tables as below. The module |
127 | automatically scans your schema and sets up storage for journal entries. |
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128 | |
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129 | My::Schema->journal_sources([qw/ table1 table2 /]); |
130 | |
131 | $schema = My::Schema->connect(...); |
132 | $schema->journal_schema_deploy; |
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133 | |
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134 | Note that if you are retrofitting journalling to an existing database, then as |
135 | well as creating the journal you will need to populate it with a history so |
136 | that when rows are deleted they can be mapped back to a (fake) creation. |
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137 | |
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138 | =head1 TABLES |
139 | |
140 | The journal schema contains a number of tables. These track row creation, |
141 | update and deletion, and also are aware of multiple operations taking place |
142 | within one transaction. |
143 | |
144 | =over 4 |
145 | |
146 | =item ChangeSet |
147 | |
148 | Each changeset row has an auto-incremented C<ID>, optional C<user_id> and |
149 | C<session_id>, and a C<set_date> which defaults to the current datetime. This |
150 | is the authoritative log of one discrete change to your database, which may |
151 | possible consist of a number of ChangeLog operations within a single |
152 | transaction. |
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153 | |
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154 | =item ChangeLog |
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155 | |
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156 | Each operation done within the transaction is recorded as a row in the |
157 | ChangeLog table. It contains an auto-incrementing C<ID>, the C<changeset_id> |
158 | and an C<order> column to establish the order in which changes took place. |
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159 | |
160 | =item AuditLog |
161 | |
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162 | For every table in the original database that is to be audited, an AuditLog |
163 | table is created. When a row appears in the original database a corresponding |
164 | row is added here with a ChangeLog ID in the C<create_id> column, and when |
165 | that original row is deleted the AuditLog is updated to add another ChangeLog |
166 | ID this time into the C<delete_id> column. A third id column contains the |
167 | primary key of the original row, so you can find it in the AuditHistory. |
168 | |
169 | Note that currently only integer-based single column primary keys are |
170 | supported in your original database tables. |
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171 | |
172 | =item AuditHistory |
173 | |
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174 | For every table in the original database to be audited, an AuditHistory table |
175 | is created. This is where the actual field data from your original table rows |
176 | are stored on creation and on each update. |
177 | |
178 | Each row in the AuditHistory has a C<change_id> field containing the ID of the |
179 | ChangeLog row. The other fields correspond to all the fields from the original |
180 | table (with any constraints removed). Each time a column value in the original |
181 | table is changed, the entire row contents after the change are added as a new |
182 | row in this table. |
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183 | |
184 | =back |
185 | |
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186 | =head1 CLASS METHODS |
187 | |
188 | Call these in your Schema Class such as the C<My::Schema> package file, as in |
189 | the SYNOPSIS, above. |
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190 | |
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191 | =over 4 |
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192 | |
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193 | =item journal_connection \@connect_info |
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194 | |
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195 | Set the connection information for the database to save your audit information |
196 | to. |
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197 | |
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198 | Leaving this blank assumes you want to store the audit data into your current |
199 | database. The storage object will be shared by the regular schema and the |
200 | journalling schema. |
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201 | |
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202 | =item journal_components @components |
203 | |
204 | If you want to add components to your journal |
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205 | (L<DBIx::Class::Schema::Versioned> for example) pass them here. |
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206 | |
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207 | =item journal_sources \@source_names |
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208 | |
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209 | Set a list of source names you would like to audit. If unset, all sources are |
210 | used. |
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211 | |
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212 | NOTE: Currently only sources with a single-column integer PK are supported, so |
213 | use this method if you have sources which don't comply with that limitation. |
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214 | |
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215 | =item journal_storage_type $type |
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216 | |
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217 | Enter the special storage type of your journal schema if needed. See |
218 | L<DBIx::Class::Storage::DBI> for more information on storage types. |
219 | |
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220 | =item journal_user \@rel |
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221 | |
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222 | The user_id column in the L</ChangeSet> will be linked to your user id with a |
223 | C<belongs_to> relation, if this is set with the appropriate arguments. For |
224 | example: |
225 | |
226 | __PACKAGE__->journal_user(['My::Schema::User', {'foreign.userid' => 'self.user_id'}]); |
227 | |
228 | =back |
229 | |
230 | =head1 OBJECT METHODS |
231 | |
232 | Once you have a connection to your database, call these methods to manage the |
233 | journalling. |
234 | |
235 | =over 4 |
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236 | |
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237 | =item journal_schema_deploy |
238 | |
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239 | Will use L<DBIx::Class::Schema/deploy> to set up the tables for journalling in |
240 | your schema. Use this method to set up your journal. |
241 | |
242 | Note that if you are retrofitting journalling to an existing database, then as |
243 | well as creating the journal you will need to populate it with a history so |
244 | that when rows are deleted they can be mapped back to a (fake) creation. |
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245 | |
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246 | =item journal_deploy_on_connect $bool |
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247 | |
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248 | If set to a true value will cause C<journal_schema_deploy> to be called on |
249 | C<connect>. |
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250 | |
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251 | Not recommended, but present for backwards compatibility. |
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252 | |
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253 | =item changeset_user $user_id |
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254 | |
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255 | Set the C<user_id> for the following changeset(s). This must be an integer. |
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256 | |
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257 | =item changeset_session $session_id |
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258 | |
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259 | Set the C<session_id> for the following changeset(s). This must be an integer. |
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260 | |
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261 | =item deploy |
262 | |
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263 | Overloaded L<DBIx::Class::Schema/deploy> which will deploy your original |
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264 | database schema and following that will deploy the journal schema. |
265 | |
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266 | =item txn_do $code_ref, @args |
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267 | |
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268 | Overloaded L<DBIx::Class::Schema/txn_do>, this must be used to start a new |
269 | ChangeSet to cover a group of changes. Each subsequent change to an audited |
270 | table will use the C<changeset_id> created in the most recent C<txn_do> call. |
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271 | |
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272 | Currently nested C<txn_do> calls cause a single ChangeSet object to be created. |
273 | |
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274 | =back |
275 | |
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276 | =head1 SEE ALSO |
277 | |
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278 | =over 4 |
279 | |
280 | =item * |
281 | |
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282 | L<DBIx::Class> - You'll need it to use this. |
283 | |
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284 | =back |
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285 | |
b468e28b |
286 | =head1 LIMITATIONS |
287 | |
288 | =over 4 |
289 | |
290 | =item * |
291 | |
292 | Only single-column integer primary key'd tables are supported for auditing. |
293 | |
294 | =item * |
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295 | |
296 | Updates made via L<DBIx::Class::ResultSet/update> are not yet supported. |
297 | |
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298 | =item * |
299 | |
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300 | No API for viewing or restoring changes yet. |
301 | |
b468e28b |
302 | =back |
303 | |
304 | Patches for the above are welcome ;-) |
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305 | |
306 | =head1 AUTHOR |
307 | |
308 | Jess Robinson <castaway@desert-island.me.uk> |
309 | |
310 | Matt S. Trout <mst@shadowcatsystems.co.uk> (ideas and prodding) |
311 | |
312 | =head1 LICENCE |
313 | |
314 | You may distribute this code under the same terms as Perl itself. |
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315 | |
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316 | =cut |
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317 | |
318 | 1; |