includes/installer/DatabaseUpdater.php

   1 <?php
   2 /**
   3  * DBMS-specific updater helper.
   4  *
   5  * @file
   6  * @ingroup Deployment
   7  */
   8
   9 require_once( dirname(__FILE__) . '/../../maintenance/Maintenance.php' );
  10
  11 /*
  12  * Class for handling database updates. Roughly based off of updaters.inc, with
  13  * a few improvements :)
  14  *
  15  * @ingroup Deployment
  16  * @since 1.17
  17  */
  18 abstract class DatabaseUpdater {
  19
  20         /**
  21          * Array of updates to perform on the database
  22          *
  23          * @var array
  24          */
  25         protected $updates = array();
  26
  27         /**
  28          * List of extension-provided database updates
  29          * @var array
  30          */
  31         protected $extensionUpdates = array();
  32
  33         /**
  34          * Handle to the database subclass
  35          *
  36          * @var DatabaseBase
  37          */
  38         protected $db;
  39
  40         protected $shared = false;
  41
  42         protected $postDatabaseUpdateMaintenance = array(
  43                 'DeleteDefaultMessages'
  44         );
  45
  46         /**
  47          * Constructor
  48          *
  49          * @param $db DatabaseBase object to perform updates on
  50          * @param $shared bool Whether to perform updates on shared tables
  51          * @param $maintenance Maintenance Maintenance object which created us
  52          */
  53         protected function __construct( DatabaseBase &$db, $shared, Maintenance $maintenance = null ) {
  54                 $this->db = $db;
  55                 $this->db->setFlag( DBO_DDLMODE ); // For Oracle's handling of schema files
  56                 $this->shared = $shared;
  57                 if ( $maintenance ) {
  58                         $this->maintenance = $maintenance;
  59                 } else {
  60                         $this->maintenance = new FakeMaintenance;
  61                 }
  62                 $this->maintenance->setDB( $db );
  63                 $this->initOldGlobals();
  64                 $this->loadExtensions();
  65                 wfRunHooks( 'LoadExtensionSchemaUpdates', array( $this ) );
  66         }
  67
  68         /**
  69          * Initialize all of the old globals. One day this should all become
  70          * something much nicer
  71          */
  72         private function initOldGlobals() {
  73                 global $wgExtNewTables, $wgExtNewFields, $wgExtPGNewFields,
  74                         $wgExtPGAlteredFields, $wgExtNewIndexes, $wgExtModifiedFields;
  75
  76                 # For extensions only, should be populated via hooks
  77                 # $wgDBtype should be checked to specifiy the proper file
  78                 $wgExtNewTables = array(); // table, dir
  79                 $wgExtNewFields = array(); // table, column, dir
  80                 $wgExtPGNewFields = array(); // table, column, column attributes; for PostgreSQL
  81                 $wgExtPGAlteredFields = array(); // table, column, new type, conversion method; for PostgreSQL
  82                 $wgExtNewIndexes = array(); // table, index, dir
  83                 $wgExtModifiedFields = array(); // table, index, dir
  84         }
  85
  86         /**
  87          * Loads LocalSettings.php, if needed, and initialises everything needed for LoadExtensionSchemaUpdates hook
  88          */
  89         private function loadExtensions() {
  90                 if ( !defined( 'MEDIAWIKI_INSTALL' ) ) {
  91                         return; // already loaded
  92                 }
  93                 $vars = Installer::getExistingLocalSettings();
  94                 if ( !$vars ) {
  95                         return; // no LocalSettings found
  96                 }
  97                 if ( !isset( $vars['wgHooks'] ) || !isset( $vars['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
  98                         return;
  99                 }
 100                 global $wgHooks, $wgAutoloadClasses;
 101                 $wgHooks['LoadExtensionSchemaUpdates'] = $vars['wgHooks']['LoadExtensionSchemaUpdates'];
 102                 $wgAutoloadClasses = $wgAutoloadClasses + $vars['wgAutoloadClasses'];
 103         }
 104
 105         /**
 106          * @throws MWException
 107          * @param DatabaseBase $db
 108          * @param bool $shared
 109          * @param null $maintenance
 110          * @return DatabaseUpdater
 111          */
 112         public static function newForDB( &$db, $shared = false, $maintenance = null ) {
 113                 $type = $db->getType();
 114                 if( in_array( $type, Installer::getDBTypes() ) ) {
 115                         $class = ucfirst( $type ) . 'Updater';
 116                         return new $class( $db, $shared, $maintenance );
 117                 } else {
 118                         throw new MWException( __METHOD__ . ' called for unsupported $wgDBtype' );
 119                 }
 120         }
 121
 122         /**
 123          * Get a database connection to run updates
 124          *
 125          * @return DatabaseBase
 126          */
 127         public function getDB() {
 128                 return $this->db;
 129         }
 130
 131         /**
 132          * Output some text. If we're running from web, escape the text first.
 133          *
 134          * @param $str String: Text to output
 135          */
 136         public function output( $str ) {
 137                 if ( $this->maintenance->isQuiet() ) {
 138                         return;
 139                 }
 140                 global $wgCommandLineMode;
 141                 if( !$wgCommandLineMode ) {
 142                         $str = htmlspecialchars( $str );
 143                 }
 144                 echo $str;
 145                 flush();
 146         }
 147
 148         /**
 149          * Add a new update coming from an extension. This should be called by
 150          * extensions while executing the LoadExtensionSchemaUpdates hook.
 151          *
 152          * @param $update Array: the update to run. Format is the following:
 153          *                first item is the callback function, it also can be a
 154          *                simple string with the name of a function in this class,
 155          *                following elements are parameters to the function.
 156          *                Note that callback functions will receive this object as
 157          *                first parameter.
 158          */
 159         public function addExtensionUpdate( Array $update ) {
 160                 $this->extensionUpdates[] = $update;
 161         }
 162
 163         /**
 164          * Convenience wrapper for addExtensionUpdate() when adding a new table (which
 165          * is the most common usage of updaters in an extension)
 166          * @param $tableName String Name of table to create
 167          * @param $sqlPath String Full path to the schema file
 168          */
 169         public function addExtensionTable( $tableName, $sqlPath ) {
 170                 $this->extensionUpdates[] = array( 'addTable', $tableName, $sqlPath, true );
 171         }
 172
 173         /**
 174          * Get the list of extension-defined updates
 175          *
 176          * @return Array
 177          */
 178         protected function getExtensionUpdates() {
 179                 return $this->extensionUpdates;
 180         }
 181
 182         public function getPostDatabaseUpdateMaintenance() {
 183                 return $this->postDatabaseUpdateMaintenance;
 184         }
 185
 186         /**
 187          * Do all the updates
 188          *
 189          * @param $what Array: what updates to perform
 190          */
 191         public function doUpdates( $what = array( 'core', 'extensions', 'purge' ) ) {
 192                 global $wgVersion;
 193
 194                 $what = array_flip( $what );
 195                 if ( isset( $what['core'] ) ) {
 196                         $this->runUpdates( $this->getCoreUpdateList(), false );
 197                 }
 198                 if ( isset( $what['extensions'] ) ) {
 199                         $this->runUpdates( $this->getOldGlobalUpdates(), false );
 200                         $this->runUpdates( $this->getExtensionUpdates(), true );
 201                 }
 202
 203                 $this->setAppliedUpdates( $wgVersion, $this->updates );
 204
 205                 if( isset( $what['purge'] ) ) {
 206                         $this->purgeCache();
 207                 }
 208                 if ( isset( $what['core'] ) ) {
 209                         $this->checkStats();
 210                 }
 211         }
 212
 213         /**
 214          * Helper function for doUpdates()
 215          *
 216          * @param $updates Array of updates to run
 217          * @param $passSelf Boolean: whether to pass this object we calling external
 218          *                  functions
 219          */
 220         private function runUpdates( array $updates, $passSelf ) {
 221                 foreach ( $updates as $params ) {
 222                         $func = array_shift( $params );
 223                         if( !is_array( $func ) && method_exists( $this, $func ) ) {
 224                                 $func = array( $this, $func );
 225                         } elseif ( $passSelf ) {
 226                                 array_unshift( $params, $this );
 227                         }
 228                         call_user_func_array( $func, $params );
 229                         flush();
 230                 }
 231                 $this->updates = array_merge( $this->updates, $updates );
 232         }
 233
 234         protected function setAppliedUpdates( $version, $updates = array() ) {
 235                 $this->db->clearFlag( DBO_DDLMODE );
 236                 if( !$this->canUseNewUpdatelog() ) {
 237                         return;
 238                 }
 239                 $key = "updatelist-$version-" . time();
 240                 $this->db->insert( 'updatelog',
 241                         array( 'ul_key' => $key, 'ul_value' => serialize( $updates ) ),
 242                          __METHOD__ );
 243                 $this->db->setFlag( DBO_DDLMODE );
 244         }
 245
 246         /**
 247          * Helper function: check if the given key is present in the updatelog table.
 248          * Obviously, only use this for updates that occur after the updatelog table was
 249          * created!
 250          * @param $key String Name of the key to check for
 251          */
 252         public function updateRowExists( $key ) {
 253                 $row = $this->db->selectRow(
 254                         'updatelog',
 255                         '1',
 256                         array( 'ul_key' => $key ),
 257                         __METHOD__
 258                 );
 259                 return (bool)$row;
 260         }
 261
 262         /**
 263          * Helper function: Add a key to the updatelog table
 264          * Obviously, only use this for updates that occur after the updatelog table was
 265          * created!
 266          * @param $key String Name of key to insert
 267          * @param $val String [optional] value to insert along with the key
 268          */
 269         public function insertUpdateRow( $key, $val = null ) {
 270                 $this->db->clearFlag( DBO_DDLMODE );
 271                 $values = array( 'ul_key' => $key );
 272                 if( $val && $this->canUseNewUpdatelog() ) {
 273                         $values['ul_value'] = $val;
 274                 }
 275                 $this->db->insert( 'updatelog', $values, __METHOD__, 'IGNORE' );
 276                 $this->db->setFlag( DBO_DDLMODE );
 277         }
 278
 279         /**
 280          * Updatelog was changed in 1.17 to have a ul_value column so we can record
 281          * more information about what kind of updates we've done (that's what this
 282          * class does). Pre-1.17 wikis won't have this column, and really old wikis
 283          * might not even have updatelog at all
 284          *
 285          * @return boolean
 286          */
 287         protected function canUseNewUpdatelog() {
 288                 return $this->db->tableExists( 'updatelog' ) &&
 289                         $this->db->fieldExists( 'updatelog', 'ul_value' );
 290         }
 291
 292         /**
 293          * Before 1.17, we used to handle updates via stuff like
 294          * $wgExtNewTables/Fields/Indexes. This is nasty :) We refactored a lot
 295          * of this in 1.17 but we want to remain back-compatible for a while. So
 296          * load up these old global-based things into our update list.
 297          */
 298         protected function getOldGlobalUpdates() {
 299                 global $wgExtNewFields, $wgExtNewTables, $wgExtModifiedFields,
 300                         $wgExtNewIndexes, $wgSharedDB, $wgSharedTables;
 301
 302                 $doUser = $this->shared ?
 303                         $wgSharedDB && in_array( 'user', $wgSharedTables ) :
 304                         !$wgSharedDB || !in_array( 'user', $wgSharedTables );
 305
 306                 $updates = array();
 307
 308                 foreach ( $wgExtNewTables as $tableRecord ) {
 309                         $updates[] = array(
 310                                 'addTable', $tableRecord[0], $tableRecord[1], true
 311                         );
 312                 }
 313
 314                 foreach ( $wgExtNewFields as $fieldRecord ) {
 315                         if ( $fieldRecord[0] != 'user' || $doUser ) {
 316                                 $updates[] = array(
 317                                         'addField', $fieldRecord[0], $fieldRecord[1],
 318                                                 $fieldRecord[2], true
 319                                 );
 320                         }
 321                 }
 322
 323                 foreach ( $wgExtNewIndexes as $fieldRecord ) {
 324                         $updates[] = array(
 325                                 'addIndex', $fieldRecord[0], $fieldRecord[1],
 326                                         $fieldRecord[2], true
 327                         );
 328                 }
 329
 330                 foreach ( $wgExtModifiedFields as $fieldRecord ) {
 331                         $updates[] = array(
 332                                 'modifyField', $fieldRecord[0], $fieldRecord[1],
 333                                         $fieldRecord[2], true
 334                         );
 335                 }
 336
 337                 return $updates;
 338         }
 339
 340         /**
 341          * Get an array of updates to perform on the database. Should return a
 342          * multi-dimensional array. The main key is the MediaWiki version (1.12,
 343          * 1.13...) with the values being arrays of updates, identical to how
 344          * updaters.inc did it (for now)
 345          *
 346          * @return Array
 347          */
 348         protected abstract function getCoreUpdateList();
 349
 350         /**
 351          * Applies a SQL patch
 352          * @param $path String Path to the patch file
 353          * @param $isFullPath Boolean Whether to treat $path as a relative or not
 354          */
 355         protected function applyPatch( $path, $isFullPath = false ) {
 356                 if ( $isFullPath ) {
 357                         $this->db->sourceFile( $path );
 358                 } else {
 359                         $this->db->sourceFile( $this->db->patchPath( $path ) );
 360                 }
 361         }
 362
 363         /**
 364          * Add a new table to the database
 365          * @param $name String Name of the new table
 366          * @param $patch String Path to the patch file
 367          * @param $fullpath Boolean Whether to treat $patch path as a relative or not
 368          */
 369         protected function addTable( $name, $patch, $fullpath = false ) {
 370                 if ( $this->db->tableExists( $name ) ) {
 371                         $this->output( "...$name table already exists.\n" );
 372                 } else {
 373                         $this->output( "Creating $name table..." );
 374                         $this->applyPatch( $patch, $fullpath );
 375                         $this->output( "ok\n" );
 376                 }
 377         }
 378
 379         /**
 380          * Add a new field to an existing table
 381          * @param $table String Name of the table to modify
 382          * @param $field String Name of the new field
 383          * @param $patch String Path to the patch file
 384          * @param $fullpath Boolean Whether to treat $patch path as a relative or not
 385          */
 386         protected function addField( $table, $field, $patch, $fullpath = false ) {
 387                 if ( !$this->db->tableExists( $table ) ) {
 388                         $this->output( "...$table table does not exist, skipping new field patch\n" );
 389                 } elseif ( $this->db->fieldExists( $table, $field ) ) {
 390                         $this->output( "...have $field field in $table table.\n" );
 391                 } else {
 392                         $this->output( "Adding $field field to table $table..." );
 393                         $this->applyPatch( $patch, $fullpath );
 394                         $this->output( "ok\n" );
 395                 }
 396         }
 397
 398         /**
 399          * Add a new index to an existing table
 400          * @param $table String Name of the table to modify
 401          * @param $index String Name of the new index
 402          * @param $patch String Path to the patch file
 403          * @param $fullpath Boolean Whether to treat $patch path as a relative or not
 404          */
 405         protected function addIndex( $table, $index, $patch, $fullpath = false ) {
 406                 if ( $this->db->indexExists( $table, $index ) ) {
 407                         $this->output( "...$index key already set on $table table.\n" );
 408                 } else {
 409                         $this->output( "Adding $index key to table $table... " );
 410                         $this->applyPatch( $patch, $fullpath );
 411                         $this->output( "ok\n" );
 412                 }
 413         }
 414
 415         /**
 416          * Drop a field from an existing table
 417          *
 418          * @param $table String Name of the table to modify
 419          * @param $field String Name of the old field
 420          * @param $patch String Path to the patch file
 421          * @param $fullpath Boolean Whether to treat $patch path as a relative or not
 422          */
 423         protected function dropField( $table, $field, $patch, $fullpath = false ) {
 424                 if ( $this->db->fieldExists( $table, $field ) ) {
 425                         $this->output( "Table $table contains $field field. Dropping... " );
 426                         $this->applyPatch( $patch, $fullpath );
 427                         $this->output( "ok\n" );
 428                 } else {
 429                         $this->output( "...$table table does not contain $field field.\n" );
 430                 }
 431         }
 432
 433         /**
 434          * Drop an index from an existing table
 435          *
 436          * @param $table String: Name of the table to modify
 437          * @param $index String: Name of the old index
 438          * @param $patch String: Path to the patch file
 439          * @param $fullpath Boolean: Whether to treat $patch path as a relative or not
 440          */
 441         protected function dropIndex( $table, $index, $patch, $fullpath = false ) {
 442                 if ( $this->db->indexExists( $table, $index ) ) {
 443                         $this->output( "Dropping $index from table $table... " );
 444                         $this->applyPatch( $patch, $fullpath );
 445                         $this->output( "ok\n" );
 446                 } else {
 447                         $this->output( "...$index key doesn't exist.\n" );
 448                 }
 449         }
 450
 451         /**
 452          * Modify an existing field
 453          *
 454          * @param $table String: name of the table to which the field belongs
 455          * @param $field String: name of the field to modify
 456          * @param $patch String: path to the patch file
 457          * @param $fullpath Boolean: whether to treat $patch path as a relative or not
 458          */
 459         public function modifyField( $table, $field, $patch, $fullpath = false ) {
 460                 $updateKey = "$table-$field-$patch";
 461                 if ( !$this->db->tableExists( $table ) ) {
 462                         $this->output( "...$table table does not exist, skipping modify field patch\n" );
 463                 } elseif ( !$this->db->fieldExists( $table, $field ) ) {
 464                         $this->output( "...$field field does not exist in $table table, skipping modify field patch\n" );
 465                 } elseif( $this->updateRowExists( $updateKey ) ) {
 466                         $this->output( "...$field in table $table already modified by patch $patch\n" );
 467                 } else {
 468                         $this->output( "Modifying $field field of table $table..." );
 469                         $this->applyPatch( $patch, $fullpath );
 470                         $this->insertUpdateRow( $updateKey );
 471                         $this->output( "ok\n" );
 472                 }
 473         }
 474
 475         /**
 476          * Purge the objectcache table
 477          */
 478         protected function purgeCache() {
 479                 # We can't guarantee that the user will be able to use TRUNCATE,
 480                 # but we know that DELETE is available to us
 481                 $this->output( "Purging caches..." );
 482                 $this->db->delete( 'objectcache', '*', __METHOD__ );
 483                 $this->output( "done.\n" );
 484         }
 485
 486         /**
 487          * Check the site_stats table is not properly populated.
 488          */
 489         protected function checkStats() {
 490                 $this->output( "Checking site_stats row..." );
 491                 $row = $this->db->selectRow( 'site_stats', '*', array( 'ss_row_id' => 1 ), __METHOD__ );
 492                 if ( $row === false ) {
 493                         $this->output( "data is missing! rebuilding...\n" );
 494                 } elseif ( isset( $row->site_stats ) && $row->ss_total_pages == -1 ) {
 495                         $this->output( "missing ss_total_pages, rebuilding...\n" );
 496                 } else {
 497                         $this->output( "done.\n" );
 498                         return;
 499                 }
 500                 SiteStatsInit::doAllAndCommit( false );
 501         }
 502
 503         # Common updater functions
 504
 505         protected function doActiveUsersInit() {
 506                 $activeUsers = $this->db->selectField( 'site_stats', 'ss_active_users', false, __METHOD__ );
 507                 if ( $activeUsers == -1 ) {
 508                         $activeUsers = $this->db->selectField( 'recentchanges',
 509                                 'COUNT( DISTINCT rc_user_text )',
 510                                 array( 'rc_user != 0', 'rc_bot' => 0, "rc_log_type != 'newusers'" ), __METHOD__
 511                         );
 512                         $this->db->update( 'site_stats',
 513                                 array( 'ss_active_users' => intval( $activeUsers ) ),
 514                                 array( 'ss_row_id' => 1 ), __METHOD__, array( 'LIMIT' => 1 )
 515                         );
 516                 }
 517                 $this->output( "...ss_active_users user count set...\n" );
 518         }
 519
 520         protected function doLogUsertextPopulation() {
 521                 if ( $this->updateRowExists( 'populate log_usertext' ) ) {
 522                         $this->output( "...log_user_text field already populated.\n" );
 523                         return;
 524                 }
 525
 526                 $this->output(
 527                         "Populating log_user_text field, printing progress markers. For large\n" .
 528                         "databases, you may want to hit Ctrl-C and do this manually with\n" .
 529                         "maintenance/populateLogUsertext.php.\n" );
 530                 $task = $this->maintenance->runChild( 'PopulateLogUsertext' );
 531                 $task->execute();
 532                 $this->output( "Done populating log_user_text field.\n" );
 533         }
 534
 535         protected function doLogSearchPopulation() {
 536                 if ( $this->updateRowExists( 'populate log_search' ) ) {
 537                         $this->output( "...log_search table already populated.\n" );
 538                         return;
 539                 }
 540
 541                 $this->output(
 542                         "Populating log_search table, printing progress markers. For large\n" .
 543                         "databases, you may want to hit Ctrl-C and do this manually with\n" .
 544                         "maintenance/populateLogSearch.php.\n" );
 545                 $task = $this->maintenance->runChild( 'PopulateLogSearch' );
 546                 $task->execute();
 547                 $this->output( "Done populating log_search table.\n" );
 548         }
 549
 550         protected function doUpdateTranscacheField() {
 551                 if ( $this->updateRowExists( 'convert transcache field' ) ) {
 552                         $this->output( "...transcache tc_time already converted.\n" );
 553                         return;
 554                 }
 555
 556                 $this->output( "Converting tc_time from UNIX epoch to MediaWiki timestamp... " );
 557                 $this->applyPatch( 'patch-tc-timestamp.sql' );
 558                 $this->output( "ok\n" );
 559         }
 560
 561         protected function doCollationUpdate() {
 562                 global $wgCategoryCollation;
 563                 if ( $this->db->selectField(
 564                         'categorylinks',
 565                         'COUNT(*)',
 566                         'cl_collation != ' . $this->db->addQuotes( $wgCategoryCollation ),
 567                         __METHOD__
 568                 ) == 0 ) {
 569                         $this->output( "...collations up-to-date.\n" );
 570                         return;
 571                 }
 572
 573                 $task = $this->maintenance->runChild( 'UpdateCollation' );
 574                 $task->execute();
 575         }
 576 }