includes/installer/DatabaseUpdater.php

   1 <?php
   2
   3 /*
   4  * Class for handling database updates. Roughly based off of updaters.inc, with
   5  * a few improvements :)
   6  *
   7  * @ingroup Deployment
   8  * @since 1.17
   9  */
  10 abstract class DatabaseUpdater {
  11
  12         /**
  13          * Array of updates to perform on the database
  14          *
  15          * @var array
  16          */
  17         protected $updates = array();
  18
  19         protected $db;
  20
  21         protected $shared = false;
  22
  23         protected $postDatabaseUpdateMaintenance = array(
  24                 'DeleteDefaultMessages'
  25         );
  26
  27         protected function __construct( $db, $shared ) {
  28                 $this->db = $db;
  29                 $this->shared = $shared;
  30         }
  31
  32         public static function newForDB( $db, $shared ) {
  33                 $type = $db->getType();
  34                 if( in_array( $type, Installer::getDBTypes() ) ) {
  35                         $class = ucfirst( $type ) . 'Updater';
  36                         return new $class( $db, $shared );
  37                 } else {
  38                         throw new MWException( __METHOD__ . ' called for unsupported $wgDBtype' );
  39                 }
  40         }
  41
  42         public function getDB() { return $this->db; }
  43
  44         public function getPostDatabaseUpdateMaintenance() {
  45                 return $this->postDatabaseUpdateMaintenance;
  46         }
  47
  48         public function doUpdates() {
  49                 global $IP, $wgVersion;
  50                 require_once( "$IP/maintenance/updaters.inc" );
  51                 $this->updates = array_merge( $this->getCoreUpdateList(),
  52                         $this->getOldGlobalUpdates() );
  53                 foreach ( $this->updates as $params ) {
  54                         $func = array_shift( $params );
  55                         if( method_exists( $this, $func ) ) {
  56                                 $func = array( $this, $func );
  57                         }
  58                         call_user_func_array( $func, $params );
  59                         flush();
  60                 }
  61                 $this->setAppliedUpdates( $wgVersion, $this->updates );
  62         }
  63
  64         protected function setAppliedUpdates( $version, $updates = array() ) {
  65                 if( !$this->canUseNewUpdatelog() ) {
  66                         return;
  67                 }
  68                 $key = "updatelist-$version-" . time();
  69                 $this->db->insert( 'updatelog',
  70                         array( 'ul_key' => $key, 'ul_value' => serialize( $updates ) ),
  71                          __METHOD__ );
  72         }
  73
  74         /**
  75          * Updatelog was changed in 1.17 to have a ul_value column so we can record
  76          * more information about what kind of updates we've done (that's what this
  77          * class does). Pre-1.17 wikis won't have this column, and really old wikis
  78          * might not even have updatelog at all
  79          *
  80          * @return boolean
  81          */
  82         protected function canUseNewUpdatelog() {
  83                 return $this->db->tableExists( 'updatelog' ) &&
  84                         $this->db->fieldExists( 'updatelog', 'ul_value' );
  85         }
  86
  87         /**
  88          * Before 1.17, we used to handle updates via stuff like $wgUpdates,
  89          * $wgExtNewTables/Fields/Indexes. This is nasty :) We refactored a lot
  90          * of this in 1.17 but we want to remain back-compatible for awhile. So
  91          * load up these old global-based things into our update list. We can't
  92          * version these like we do with our core updates, so they have to go
  93          * in 'always'
  94          */
  95         private function getOldGlobalUpdates() {
  96                 global $wgUpdates, $wgExtNewFields, $wgExtNewTables,
  97                         $wgExtModifiedFields, $wgExtNewIndexes, $wgSharedDB, $wgSharedTables;
  98
  99                 $doUser = $this->shared ?
 100                         $wgSharedDB && in_array( 'user', $wgSharedTables ) :
 101                         !$wgSharedDB || !in_array( 'user', $wgSharedTables );
 102
 103                 $updates = array();
 104
 105                 if( isset( $wgUpdates[ $this->db->getType() ] ) ) {
 106                         foreach( $wgUpdates[ $this->db->getType() ] as $upd ) {
 107                                 $updates[] = $upd;
 108                         }
 109                 }
 110
 111                 foreach ( $wgExtNewTables as $tableRecord ) {
 112                         $updates[] = array(
 113                                 'addTable', $tableRecord[0], $tableRecord[1], true
 114                         );
 115                 }
 116
 117                 foreach ( $wgExtNewFields as $fieldRecord ) {
 118                         if ( $fieldRecord[0] != 'user' || $doUser ) {
 119                                 $updates[] = array(
 120                                         'add_field', $fieldRecord[0], $fieldRecord[1],
 121                                                 $fieldRecord[2], true
 122                                 );
 123                         }
 124                 }
 125
 126                 foreach ( $wgExtNewIndexes as $fieldRecord ) {
 127                         $updates[] = array(
 128                                 'add_index', $fieldRecord[0], $fieldRecord[1],
 129                                         $fieldRecord[2], true
 130                         );
 131                 }
 132
 133                 foreach ( $wgExtModifiedFields as $fieldRecord ) {
 134                         $updates[] = array(
 135                                 'modify_field', $fieldRecord[0], $fieldRecord[1],
 136                                         $fieldRecord[2], true
 137                         );
 138                 }
 139
 140                 return $updates;
 141         }
 142
 143         /**
 144          * Get an array of updates to perform on the database. Should return a
 145          * mutli-dimensional array. The main key is the MediaWiki version (1.12,
 146          * 1.13...) with the values being arrays of updates, identical to how
 147          * updaters.inc did it (for now)
 148          *
 149          * @return Array
 150          */
 151         protected abstract function getCoreUpdateList();
 152
 153         /**
 154          * Add a new table to the database
 155          * @param $name String Name of the new table
 156          * @param $patch String Path to the patch file
 157          * @param $fullpath Boolean Whether to treat $fullPath as a relative or not
 158          */
 159         protected function addTable( $name, $patch, $fullpath = false ) {
 160                 if ( $this->db->tableExists( $name ) ) {
 161                         wfOut( "...$name table already exists.\n" );
 162                 } else {
 163                         wfOut( "Creating $name table..." );
 164                         if ( $fullpath ) {
 165                                 $this->db->sourceFile( $patch );
 166                         } else {
 167                                 $this->db->sourceFile( archive( $patch ) );
 168                         }
 169                         wfOut( "ok\n" );
 170                 }
 171         }
 172 }
 173
 174 class OracleUpdater extends DatabaseUpdater {
 175         protected function getCoreUpdateList() {
 176                 return array();
 177         }
 178 }