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::doGetPositionAtTime()
 104          * @param $time integer|string timestamp
 105          * @return integer|false
 106          */
 107         protected function doGetPositionAtTime( $time ) {
 108                 $dbw = $this->getMasterDB();
 109
 110                 $encTimestamp = $dbw->addQuotes( $dbw->timestamp( $time ) );
 111                 return $dbw->selectField( 'filejournal', 'fj_id',
 112                         array( 'fj_backend' => $this->backend, "fj_timestamp <= $encTimestamp" ),
 113                         __METHOD__,
 114                         array( 'ORDER BY' => 'fj_timestamp DESC' )
 115                 );
 116         }
 117
 118         /**
 119          * @see FileJournal::doGetChangeEntries()
 120          * @return Array
 121          * @throws DBError
 122          */
 123         protected function doGetChangeEntries( $start, $limit ) {
 124                 $dbw = $this->getMasterDB();
 125
 126                 $res = $dbw->select( 'filejournal', '*',
 127                         array(
 128                                 'fj_backend' => $this->backend,
 129                                 'fj_id >= ' . $dbw->addQuotes( (int)$start ) ), // $start may be 0
 130                         __METHOD__,
 131                         array_merge( array( 'ORDER BY' => 'fj_id ASC' ),
 132                                 $limit ? array( 'LIMIT' => $limit ) : array() )
 133                 );
 134
 135                 $entries = array();
 136                 foreach ( $res as $row ) {
 137                         $item = array();
 138                         foreach ( (array)$row as $key => $value ) {
 139                                 $item[substr( $key, 3 )] = $value; // "fj_op" => "op"
 140                         }
 141                         $entries[] = $item;
 142                 }
 143
 144                 return $entries;
 145         }
 146
 147         /**
 148          * @see FileJournal::purgeOldLogs()
 149          * @return Status
 150          * @throws DBError
 151          */
 152         protected function doPurgeOldLogs() {
 153                 $status = Status::newGood();
 154                 if ( $this->ttlDays <= 0 ) {
 155                         return $status; // nothing to do
 156                 }
 157
 158                 $dbw = $this->getMasterDB();
 159                 $dbCutoff = $dbw->timestamp( time() - 86400 * $this->ttlDays );
 160
 161                 $dbw->delete( 'filejournal',
 162                         array( 'fj_timestamp < ' . $dbw->addQuotes( $dbCutoff ) ),
 163                         __METHOD__
 164                 );
 165
 166                 return $status;
 167         }
 168
 169         /**
 170          * Get a master connection to the logging DB
 171          *
 172          * @return DatabaseBase
 173          * @throws DBError
 174          */
 175         protected function getMasterDB() {
 176                 if ( !$this->dbw ) {
 177                         // Get a separate connection in autocommit mode
 178                         $lb = wfGetLBFactory()->newMainLB();
 179                         $this->dbw = $lb->getConnection( DB_MASTER, array(), $this->wiki );
 180                         $this->dbw->clearFlag( DBO_TRX );
 181                 }
 182                 return $this->dbw;
 183         }
 184 }