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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_02'; |
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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 |
12 | |
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13 | sub _journal_schema { |
14 | my $self = shift; |
15 | $self->result_source->schema->_journal_schema; |
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16 | } |
17 | |
18 | sub insert |
19 | { |
20 | my ($self, @args) = @_; |
21 | |
22 | return if($self->in_storage); |
23 | |
24 | my $res = $self->next::method(@args); |
25 | |
26 | $self->journal_log_insert(); |
27 | |
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28 | return $res; |
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29 | } |
30 | |
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31 | sub journal_log_insert |
32 | { |
33 | my ($self) = @_; |
34 | |
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35 | if ( $self->in_storage ) { |
36 | my $j = $self->_journal_schema; |
37 | my $change_id = $j->journal_create_change()->id; |
38 | $j->journal_update_or_create_log_entry( $self, create_id => $change_id ); |
39 | $j->journal_record_in_history( $self, audit_change_id => $change_id ); |
40 | } |
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41 | } |
42 | |
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43 | ## On delete, update delete_id of AuditLog |
44 | |
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45 | sub delete |
46 | { |
47 | my ($self, @rest) = @_; |
48 | $self->next::method(@rest); |
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49 | $self->journal_log_delete(@rest); |
50 | } |
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51 | |
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52 | sub journal_log_delete |
53 | { |
54 | my ($self) = @_; |
55 | |
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56 | unless ($self->in_storage) { |
57 | my $j = $self->_journal_schema; |
58 | $j->journal_update_or_create_log_entry( $self, delete_id => $j->journal_create_change->id ); |
59 | } |
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60 | } |
61 | |
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62 | ## On update, copy previous row's contents to AuditHistory |
63 | |
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64 | sub update |
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65 | { |
66 | my ($self, $upd, @rest) = @_; |
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67 | $self->journal_log_update($upd, @rest); |
68 | $self->next::method($upd, @rest); |
69 | } |
70 | |
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71 | sub journal_log_update |
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72 | { |
73 | my ($self, $upd, @rest) = @_; |
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74 | |
75 | if($self->in_storage) |
76 | { |
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77 | my $j = $self->_journal_schema; |
78 | |
79 | my $change = $j->journal_create_change; |
80 | my $prev = $self->result_source->resultset->find( $self->ident_condition ); |
81 | $j->journal_record_in_history( $prev, audit_change_id => $change ); |
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82 | } |
1e996809 |
83 | } |
84 | |
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85 | =head1 NAME |
86 | |
87 | DBIx::Class::Journal - auditing for tables managed by DBIx::Class |
88 | |
89 | =head1 SYNOPSIS |
90 | |
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91 | package My::Schema; |
92 | use base 'DBIx::Class::Schema'; |
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93 | |
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94 | __PACKAGE__->load_components(qw/Schema::Journal/); |
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95 | |
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96 | __PACKAGE__->journal_connection(['dbi:SQLite:t/var/Audit.db']); |
97 | __PACKAGE__->journal_user(['My::Schema::User', {'foreign.userid' => 'self.user_id'}]); |
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98 | |
99 | |
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100 | ####### |
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101 | |
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102 | $schema->changeset_user($user->id); |
103 | my $new_artist = $schema->txn_do( sub { |
104 | return $schema->resultset('Artist')->create({ name => 'Fred' }); |
105 | }); |
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106 | |
107 | |
108 | =head1 DESCRIPTION |
109 | |
110 | The purpose of this L<DBIx::Class> component module is to create an |
111 | audit-trail for all changes made to the data in your database (via a |
112 | DBIx::Class schema). It creates changesets and assigns each |
113 | create/update/delete operation an id. The creation and deletion date |
114 | of each row is stored, as well as the previous contents of any row |
115 | that gets changed. |
116 | |
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117 | All queries which need auditing must be called using |
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118 | L<DBIx::Class::Schema/txn_do>, which is used to create changesets for |
119 | each transaction. |
120 | |
121 | To track who did which changes, the user_id (an integer) of the |
122 | current user can be set, a session_id can also be set, both are |
123 | optional. |
124 | |
125 | To access the auditing schema to look at the auditdata or revert a |
126 | change, use C<< $schema->_journal_schema >>. |
127 | |
128 | =head2 TABLES |
129 | |
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130 | The journal schema contains a number of tables. |
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131 | |
132 | =over |
133 | |
134 | =item ChangeSet |
135 | |
136 | Each changeset row has an auto-incremented ID, optional user_id and |
137 | session_id, and a set_date which defaults to the current datetime. |
138 | |
139 | A ChangeSet has_many Changes. |
140 | |
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141 | =item ChangeLog |
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142 | |
143 | Each change/operation done in the transaction is recorded as a row in |
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144 | the ChangeLog table. It contains an auto-incrementing ID, the |
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145 | changeset_id and an order column for the ordering of each change in |
146 | the changeset. |
147 | |
148 | =item AuditLog |
149 | |
150 | For every table in the original database that is to be audited, an |
151 | AuditLog table is created. Each auditlog row has an id which will |
152 | contain the primary key of the table it is associated with. (NB: |
153 | currently only supports integer-based single column PKs). The |
154 | create_id and delete_id fields contain the IDs of the Changes that |
155 | created or deleted this row. |
156 | |
157 | =item AuditHistory |
158 | |
159 | For every table in the original database to be audited, an |
160 | AuditHistory table is created. Each row has a change_id field |
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161 | containing the ID of the ChangeLog row. The other fields correspond to |
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162 | all the fields from the original table. Each time a column value in |
163 | the original table is changed, the entire row contents before the |
164 | change are added as a new row in this table. |
165 | |
166 | =back |
167 | |
168 | =head2 METHODS |
169 | |
170 | =over |
171 | |
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172 | =item journal_connection \@connect_info |
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173 | |
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174 | Set the connection information for the database to save your audit |
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175 | information to. |
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176 | |
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177 | Leaving this blank assumes you want to store the audit data into your current |
178 | database. The storage object will be shared by the regular schema and the |
179 | journalling schema. |
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180 | |
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181 | =item journal_sources \@source_names |
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182 | |
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183 | Set a list of source names you would like to audit, if unset, all |
184 | sources are used. |
185 | |
186 | NOTE: Currently only sources with a single-column PK are supported, so |
187 | use this method if you have sources with multi-column PKs. |
188 | |
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189 | =item journal_storage_type $type |
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190 | |
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191 | Enter the special storage type of your journal schema if needed. See |
192 | L<DBIx::Class::Storage::DBI> for more information on storage types. |
193 | |
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194 | =item journal_user \@rel |
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195 | |
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196 | The user_id column in the L</ChangeSet> will be linked to your user id |
197 | with a belongs_to relation, if this is set with the appropriate |
198 | arguments. |
199 | |
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200 | =item journal_deploy_on_connect $bool |
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201 | |
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202 | If set to a true value will cause C<journal_schema_deploy> to be called on |
203 | C<connect>. |
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204 | |
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205 | Not reccomended, but present for backwards compatibility. |
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206 | |
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207 | =item changeset_user $user_id |
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208 | |
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209 | Set the user_id for the following changeset(s). This must be an integer. |
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210 | |
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211 | =item changeset_session $session_id |
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212 | |
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213 | Set the session_id for the following changeset(s). This must be an integer. |
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214 | |
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215 | =item txn_do $code_ref, @args |
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216 | |
217 | Overloaded L<DBIx::Class::Schema/txn_do>, this must be used to start a |
218 | new changeset to cover a group of changes. Each subsequent change to |
219 | an audited table will use the changeset_id created in the most recent |
220 | txn_do call. |
221 | |
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222 | Currently nested C<txn_do> calls cause a single ChangeSet object to be created. |
223 | |
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224 | =back |
225 | |
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226 | =head1 SEE ALSO |
227 | |
228 | L<DBIx::Class> - You'll need it to use this. |
229 | |
230 | =head1 NOTES |
231 | |
232 | Only single-column integer primary key'd tables are supported for auditing so far. |
233 | |
234 | Updates made via L<DBIx::Class::ResultSet/update> are not yet supported. |
235 | |
236 | No API for viewing or restoring changes yet. |
237 | |
238 | Patches for the above welcome ;) |
239 | |
240 | =head1 AUTHOR |
241 | |
242 | Jess Robinson <castaway@desert-island.me.uk> |
243 | |
244 | Matt S. Trout <mst@shadowcatsystems.co.uk> (ideas and prodding) |
245 | |
246 | =head1 LICENCE |
247 | |
248 | You may distribute this code under the same terms as Perl itself. |
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249 | |
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250 | =cut |
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251 | |
252 | 1; |