includes/filebackend/filejournal/DBFileJournal.php

   1 <?php
   2 /**
   3  * Version of FileJournal that logs to a DB table.
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 2 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along
  16  * with this program; if not, write to the Free Software Foundation, Inc.,
  17  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18  * http://www.gnu.org/copyleft/gpl.html
  19  *
  20  * @file
  21  * @ingroup FileJournal
  22  * @author Aaron Schulz
  23  */
  24
  25 /**
  26  * Version of FileJournal that logs to a DB table
  27  * @since 1.20
  28  */
  29 class DBFileJournal extends FileJournal {
  30         /** @var DatabaseBase */
  31         protected $dbw;
  32
  33         protected $wiki = false; // string; wiki DB name
  34
  35         /**
  36          * Construct a new instance from configuration.
  37          * $config includes:
  38          *     'wiki' : wiki name to use for LoadBalancer
  39          *
  40          * @param $config Array
  41          */
  42         protected function __construct( array $config ) {
  43                 parent::__construct( $config );
  44
  45                 $this->wiki = $config['wiki'];
  46         }
  47
  48         /**
  49          * @see FileJournal::logChangeBatch()
  50          * @return Status
  51          */
  52         protected function doLogChangeBatch( array $entries, $batchId ) {
  53                 $status = Status::newGood();
  54
  55                 try {
  56                         $dbw = $this->getMasterDB();
  57                 } catch ( DBError $e ) {
  58                         $status->fatal( 'filejournal-fail-dbconnect', $this->backend );
  59                         return $status;
  60                 }
  61
  62                 $now = wfTimestamp( TS_UNIX );
  63
  64                 $data = array();
  65                 foreach ( $entries as $entry ) {
  66                         $data[] = array(
  67                                 'fj_batch_uuid' => $batchId,
  68                                 'fj_backend'    => $this->backend,
  69                                 'fj_op'         => $entry['op'],
  70                                 'fj_path'       => $entry['path'],
  71                                 'fj_new_sha1'   => $entry['newSha1'],
  72                                 'fj_timestamp'  => $dbw->timestamp( $now )
  73                         );
  74                 }
  75
  76                 try {
  77                         $dbw->insert( 'filejournal', $data, __METHOD__ );
  78                         if ( mt_rand( 0, 99 ) == 0 ) {
  79                                 $this->purgeOldLogs(); // occasionally delete old logs
  80                         }
  81                 } catch ( DBError $e ) {
  82                         $status->fatal( 'filejournal-fail-dbquery', $this->backend );
  83                         return $status;
  84                 }
  85
  86                 return $status;
  87         }
  88
  89         /**
  90          * @see FileJournal::doGetCurrentPosition()
  91          * @return integer|false
  92          */
  93         protected function doGetCurrentPosition() {
  94                 $dbw = $this->getMasterDB();
  95
  96                 return $dbw->selectField( 'filejournal', 'MAX(fj_id)',
  97                         array( 'fj_backend' => $this->backend ),
  98                         __METHOD__
  99                 );
 100         }
 101
 102         /**
 103          * @see FileJournal::doGetChangeEntries()
 104          * @return Array
 105          * @throws DBError
 106          */
 107         protected function doGetChangeEntries( $start, $limit ) {
 108                 $dbw = $this->getMasterDB();
 109
 110                 $res = $dbw->select( 'filejournal', '*',
 111                         array(
 112                                 'fj_backend' => $this->backend,
 113                                 'fj_id >= ' . $dbw->addQuotes( (int)$start ) ), // $start may be 0
 114                         __METHOD__,
 115                         array_merge( array( 'ORDER BY' => 'fj_id ASC' ),
 116                                 $limit ? array( 'LIMIT' => $limit ) : array() )
 117                 );
 118
 119                 $entries = array();
 120                 foreach ( $res as $row ) {
 121                         $item = array();
 122                         foreach ( (array)$row as $key => $value ) {
 123                                 $item[substr( $key, 3 )] = $value; // "fj_op" => "op"
 124                         }
 125                         $entries[] = $item;
 126                 }
 127
 128                 return $entries;
 129         }
 130
 131         /**
 132          * @see FileJournal::purgeOldLogs()
 133          * @return Status
 134          * @throws DBError
 135          */
 136         protected function doPurgeOldLogs() {
 137                 $status = Status::newGood();
 138                 if ( $this->ttlDays <= 0 ) {
 139                         return $status; // nothing to do
 140                 }
 141
 142                 $dbw = $this->getMasterDB();
 143                 $dbCutoff = $dbw->timestamp( time() - 86400 * $this->ttlDays );
 144
 145                 $dbw->delete( 'filejournal',
 146                         array( 'fj_timestamp < ' . $dbw->addQuotes( $dbCutoff ) ),
 147                         __METHOD__
 148                 );
 149
 150                 return $status;
 151         }
 152
 153         /**
 154          * Get a master connection to the logging DB
 155          *
 156          * @return DatabaseBase
 157          * @throws DBError
 158          */
 159         protected function getMasterDB() {
 160                 if ( !$this->dbw ) {
 161                         // Get a separate connection in autocommit mode
 162                         $lb = wfGetLBFactory()->newMainLB();
 163                         $this->dbw = $lb->getConnection( DB_MASTER, array(), $this->wiki );
 164                         $this->dbw->clearFlag( DBO_TRX );
 165                 }
 166                 return $this->dbw;
 167         }
 168 }