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          *
  38          * @param array $config Includes:
  39          *     'wiki' : wiki name to use for LoadBalancer
  40          */
  41         protected function __construct( array $config ) {
  42                 parent::__construct( $config );
  43
  44                 $this->wiki = $config['wiki'];
  45         }
  46
  47         /**
  48          * @see FileJournal::logChangeBatch()
  49          * @param array $entries
  50          * @param string $batchId
  51          * @return Status
  52          */
  53         protected function doLogChangeBatch( array $entries, $batchId ) {
  54                 $status = Status::newGood();
  55
  56                 try {
  57                         $dbw = $this->getMasterDB();
  58                 } catch ( DBError $e ) {
  59                         $status->fatal( 'filejournal-fail-dbconnect', $this->backend );
  60
  61                         return $status;
  62                 }
  63
  64                 $now = wfTimestamp( TS_UNIX );
  65
  66                 $data = array();
  67                 foreach ( $entries as $entry ) {
  68                         $data[] = array(
  69                                 'fj_batch_uuid' => $batchId,
  70                                 'fj_backend' => $this->backend,
  71                                 'fj_op' => $entry['op'],
  72                                 'fj_path' => $entry['path'],
  73                                 'fj_new_sha1' => $entry['newSha1'],
  74                                 'fj_timestamp' => $dbw->timestamp( $now )
  75                         );
  76                 }
  77
  78                 try {
  79                         $dbw->insert( 'filejournal', $data, __METHOD__ );
  80                         if ( mt_rand( 0, 99 ) == 0 ) {
  81                                 $this->purgeOldLogs(); // occasionally delete old logs
  82                         }
  83                 } catch ( DBError $e ) {
  84                         $status->fatal( 'filejournal-fail-dbquery', $this->backend );
  85
  86                         return $status;
  87                 }
  88
  89                 return $status;
  90         }
  91
  92         /**
  93          * @see FileJournal::doGetCurrentPosition()
  94          * @return bool|mixed The value from the field, or false on failure.
  95          */
  96         protected function doGetCurrentPosition() {
  97                 $dbw = $this->getMasterDB();
  98
  99                 return $dbw->selectField( 'filejournal', 'MAX(fj_id)',
 100                         array( 'fj_backend' => $this->backend ),
 101                         __METHOD__
 102                 );
 103         }
 104
 105         /**
 106          * @see FileJournal::doGetPositionAtTime()
 107          * @param int|string $time Timestamp
 108          * @return bool|mixed The value from the field, or false on failure.
 109          */
 110         protected function doGetPositionAtTime( $time ) {
 111                 $dbw = $this->getMasterDB();
 112
 113                 $encTimestamp = $dbw->addQuotes( $dbw->timestamp( $time ) );
 114
 115                 return $dbw->selectField( 'filejournal', 'fj_id',
 116                         array( 'fj_backend' => $this->backend, "fj_timestamp <= $encTimestamp" ),
 117                         __METHOD__,
 118                         array( 'ORDER BY' => 'fj_timestamp DESC' )
 119                 );
 120         }
 121
 122         /**
 123          * @see FileJournal::doGetChangeEntries()
 124          * @param int $start
 125          * @param int $limit
 126          * @return array
 127          */
 128         protected function doGetChangeEntries( $start, $limit ) {
 129                 $dbw = $this->getMasterDB();
 130
 131                 $res = $dbw->select( 'filejournal', '*',
 132                         array(
 133                                 'fj_backend' => $this->backend,
 134                                 'fj_id >= ' . $dbw->addQuotes( (int)$start ) ), // $start may be 0
 135                         __METHOD__,
 136                         array_merge( array( 'ORDER BY' => 'fj_id ASC' ),
 137                                 $limit ? array( 'LIMIT' => $limit ) : array() )
 138                 );
 139
 140                 $entries = array();
 141                 foreach ( $res as $row ) {
 142                         $item = array();
 143                         foreach ( (array)$row as $key => $value ) {
 144                                 $item[substr( $key, 3 )] = $value; // "fj_op" => "op"
 145                         }
 146                         $entries[] = $item;
 147                 }
 148
 149                 return $entries;
 150         }
 151
 152         /**
 153          * @see FileJournal::purgeOldLogs()
 154          * @return Status
 155          * @throws DBError
 156          */
 157         protected function doPurgeOldLogs() {
 158                 $status = Status::newGood();
 159                 if ( $this->ttlDays <= 0 ) {
 160                         return $status; // nothing to do
 161                 }
 162
 163                 $dbw = $this->getMasterDB();
 164                 $dbCutoff = $dbw->timestamp( time() - 86400 * $this->ttlDays );
 165
 166                 $dbw->delete( 'filejournal',
 167                         array( 'fj_timestamp < ' . $dbw->addQuotes( $dbCutoff ) ),
 168                         __METHOD__
 169                 );
 170
 171                 return $status;
 172         }
 173
 174         /**
 175          * Get a master connection to the logging DB
 176          *
 177          * @return DatabaseBase
 178          * @throws DBError
 179          */
 180         protected function getMasterDB() {
 181                 if ( !$this->dbw ) {
 182                         // Get a separate connection in autocommit mode
 183                         $lb = wfGetLBFactory()->newMainLB();
 184                         $this->dbw = $lb->getConnection( DB_MASTER, array(), $this->wiki );
 185                         $this->dbw->clearFlag( DBO_TRX );
 186                 }
 187
 188                 return $this->dbw;
 189         }
 190 }