DatabaseUpdater.php

Go to the documentation of this file.

<?php
require_once( __DIR__ . '/../../maintenance/Maintenance.php' );

abstract class DatabaseUpdater {

        protected $updates = array();

        protected $updatesSkipped = array();

        protected $extensionUpdates = array();

        protected $db;

        protected $shared = false;

        protected $postDatabaseUpdateMaintenance = array(
                'DeleteDefaultMessages',
                'PopulateRevisionLength',
                'PopulateRevisionSha1',
                'PopulateImageSha1',
                'FixExtLinksProtocolRelative',
                'PopulateFilearchiveSha1',
        );

        protected $fileHandle = null;

        protected $skipSchema = false;

        protected $wgContentHandlerUseDB = true;

        protected function __construct( DatabaseBase &$db, $shared, Maintenance $maintenance = null ) {
                $this->db = $db;
                $this->db->setFlag( DBO_DDLMODE ); // For Oracle's handling of schema files
                $this->shared = $shared;
                if ( $maintenance ) {
                        $this->maintenance = $maintenance;
                        $this->fileHandle = $maintenance->fileHandle;
                } else {
                        $this->maintenance = new FakeMaintenance;
                }
                $this->maintenance->setDB( $db );
                $this->initOldGlobals();
                $this->loadExtensions();
                wfRunHooks( 'LoadExtensionSchemaUpdates', array( $this ) );
        }

        private function initOldGlobals() {
                global $wgExtNewTables, $wgExtNewFields, $wgExtPGNewFields,
                        $wgExtPGAlteredFields, $wgExtNewIndexes, $wgExtModifiedFields;

                # For extensions only, should be populated via hooks
                # $wgDBtype should be checked to specifiy the proper file
                $wgExtNewTables = array(); // table, dir
                $wgExtNewFields = array(); // table, column, dir
                $wgExtPGNewFields = array(); // table, column, column attributes; for PostgreSQL
                $wgExtPGAlteredFields = array(); // table, column, new type, conversion method; for PostgreSQL
                $wgExtNewIndexes = array(); // table, index, dir
                $wgExtModifiedFields = array(); // table, index, dir
        }

        private function loadExtensions() {
                if ( !defined( 'MEDIAWIKI_INSTALL' ) ) {
                        return; // already loaded
                }
                $vars = Installer::getExistingLocalSettings();
                if ( !$vars ) {
                        return; // no LocalSettings found
                }
                if ( !isset( $vars['wgHooks'] ) || !isset( $vars['wgHooks']['LoadExtensionSchemaUpdates'] ) ) {
                        return;
                }
                global $wgHooks, $wgAutoloadClasses;
                $wgHooks['LoadExtensionSchemaUpdates'] = $vars['wgHooks']['LoadExtensionSchemaUpdates'];
                $wgAutoloadClasses = $wgAutoloadClasses + $vars['wgAutoloadClasses'];
        }

        public static function newForDB( &$db, $shared = false, $maintenance = null ) {
                $type = $db->getType();
                if( in_array( $type, Installer::getDBTypes() ) ) {
                        $class = ucfirst( $type ) . 'Updater';
                        return new $class( $db, $shared, $maintenance );
                } else {
                        throw new MWException( __METHOD__ . ' called for unsupported $wgDBtype' );
                }
        }

        public function getDB() {
                return $this->db;
        }

        public function output( $str ) {
                if ( $this->maintenance->isQuiet() ) {
                        return;
                }
                global $wgCommandLineMode;
                if( !$wgCommandLineMode ) {
                        $str = htmlspecialchars( $str );
                }
                echo $str;
                flush();
        }

        public function addExtensionUpdate( array $update ) {
                $this->extensionUpdates[] = $update;
        }

        public function addExtensionTable( $tableName, $sqlPath ) {
                $this->extensionUpdates[] = array( 'addTable', $tableName, $sqlPath, true );
        }

        public function addExtensionIndex( $tableName, $indexName, $sqlPath ) {
                $this->extensionUpdates[] = array( 'addIndex', $tableName, $indexName, $sqlPath, true );
        }

        public function addExtensionField( $tableName, $columnName, $sqlPath ) {
                $this->extensionUpdates[] = array( 'addField', $tableName, $columnName, $sqlPath, true );
        }

        public function dropExtensionField( $tableName, $columnName, $sqlPath ) {
                $this->extensionUpdates[] = array( 'dropField', $tableName, $columnName, $sqlPath, true );
        }

        public function dropExtensionIndex( $tableName, $indexName, $sqlPath ) {
                $this->extensionUpdates[] = array( 'dropIndex', $tableName, $indexName, $sqlPath, true );
        }

        public function dropExtensionTable( $tableName, $sqlPath ) {
                $this->extensionUpdates[] = array( 'dropTable', $tableName, $sqlPath, true );
        }

        public function renameExtensionIndex( $tableName, $oldIndexName, $newIndexName, $sqlPath, $skipBothIndexExistWarning = false ) {
                $this->extensionUpdates[] = array( 'renameIndex', $tableName, $oldIndexName, $newIndexName, $skipBothIndexExistWarning, $sqlPath, true );
        }

        public function modifyExtensionField( $tableName, $fieldName, $sqlPath) {
                $this->extensionUpdates[] = array( 'modifyField', $tableName, $fieldName, $sqlPath, true );
        }

        public function tableExists( $tableName ) {
                return ( $this->db->tableExists( $tableName, __METHOD__ ) );
        }

        public function addPostDatabaseUpdateMaintenance( $class ) {
                $this->postDatabaseUpdateMaintenance[] = $class;
        }

        protected function getExtensionUpdates() {
                return $this->extensionUpdates;
        }

        public function getPostDatabaseUpdateMaintenance() {
                return $this->postDatabaseUpdateMaintenance;
        }

        private function writeSchemaUpdateFile( $schemaUpdate = array() ) {
                $updates = $this->updatesSkipped;
                $this->updatesSkipped = array();

                foreach( $updates as $funcList ) {
                        $func = $funcList[0];
                        $arg = $funcList[1];
                        $origParams = $funcList[2];
                        call_user_func_array( $func, $arg );
                        flush();
                        $this->updatesSkipped[] = $origParams;
                }
        }

        public function doUpdates( $what = array( 'core', 'extensions', 'stats' ) ) {
                global $wgVersion, $wgLocalisationCacheConf;

                $this->db->begin( __METHOD__ );
                $what = array_flip( $what );
                $this->skipSchema = isset( $what['noschema'] ) || $this->fileHandle !== null;
                if ( isset( $what['core'] ) ) {
                        $this->runUpdates( $this->getCoreUpdateList(), false );
                }
                if ( isset( $what['extensions'] ) ) {
                        $this->runUpdates( $this->getOldGlobalUpdates(), false );
                        $this->runUpdates( $this->getExtensionUpdates(), true );
                }

                if ( isset( $what['stats'] ) ) {
                        $this->checkStats();
                }

                if ( isset( $what['purge'] ) ) {
                        $this->purgeCache();

                        if ( $wgLocalisationCacheConf['manualRecache'] ) {
                                $this->rebuildLocalisationCache();
                        }
                }

                $this->setAppliedUpdates( $wgVersion, $this->updates );

                if( $this->fileHandle ) {
                        $this->skipSchema = false;
                        $this->writeSchemaUpdateFile();
                        $this->setAppliedUpdates( "$wgVersion-schema", $this->updatesSkipped );
                }

                $this->db->commit( __METHOD__ );
        }

        private function runUpdates( array $updates, $passSelf ) {
                $updatesDone = array();
                $updatesSkipped = array();
                foreach ( $updates as $params ) {
                        $origParams = $params;
                        $func = array_shift( $params );
                        if( !is_array( $func ) && method_exists( $this, $func ) ) {
                                $func = array( $this, $func );
                        } elseif ( $passSelf ) {
                                array_unshift( $params, $this );
                        }
                        $ret = call_user_func_array( $func, $params );
                        flush();
                        if( $ret !== false ) {
                                $updatesDone[] = $origParams;
                        } else {
                                $updatesSkipped[] = array( $func, $params, $origParams );
                        }
                }
                $this->updatesSkipped = array_merge( $this->updatesSkipped, $updatesSkipped );
                $this->updates = array_merge( $this->updates, $updatesDone );
        }

        protected function setAppliedUpdates( $version, $updates = array() ) {
                $this->db->clearFlag( DBO_DDLMODE );
                if( !$this->canUseNewUpdatelog() ) {
                        return;
                }
                $key = "updatelist-$version-" . time();
                $this->db->insert( 'updatelog',
                        array( 'ul_key' => $key, 'ul_value' => serialize( $updates ) ),
                        __METHOD__ );
                $this->db->setFlag( DBO_DDLMODE );
        }

        public function updateRowExists( $key ) {
                $row = $this->db->selectRow(
                        'updatelog',
                        '1',
                        array( 'ul_key' => $key ),
                        __METHOD__
                );
                return (bool)$row;
        }

        public function insertUpdateRow( $key, $val = null ) {
                $this->db->clearFlag( DBO_DDLMODE );
                $values = array( 'ul_key' => $key );
                if( $val && $this->canUseNewUpdatelog() ) {
                        $values['ul_value'] = $val;
                }
                $this->db->insert( 'updatelog', $values, __METHOD__, 'IGNORE' );
                $this->db->setFlag( DBO_DDLMODE );
        }

        protected function canUseNewUpdatelog() {
                return $this->db->tableExists( 'updatelog', __METHOD__ ) &&
                        $this->db->fieldExists( 'updatelog', 'ul_value', __METHOD__ );
        }

        protected function doTable( $name ) {
                global $wgSharedDB, $wgSharedTables;

                // Don't bother to check $wgSharedTables if there isn't a shared database
                // or the user actually also wants to do updates on the shared database.
                if ( $wgSharedDB === null || $this->shared ) {
                        return true;
                }

                return !in_array( $name, $wgSharedTables );
        }

        protected function getOldGlobalUpdates() {
                global $wgExtNewFields, $wgExtNewTables, $wgExtModifiedFields,
                        $wgExtNewIndexes;

                $updates = array();

                foreach ( $wgExtNewTables as $tableRecord ) {
                        $updates[] = array(
                                'addTable', $tableRecord[0], $tableRecord[1], true
                        );
                }

                foreach ( $wgExtNewFields as $fieldRecord ) {
                        $updates[] = array(
                                'addField', $fieldRecord[0], $fieldRecord[1],
                                        $fieldRecord[2], true
                        );
                }

                foreach ( $wgExtNewIndexes as $fieldRecord ) {
                        $updates[] = array(
                                'addIndex', $fieldRecord[0], $fieldRecord[1],
                                        $fieldRecord[2], true
                        );
                }

                foreach ( $wgExtModifiedFields as $fieldRecord ) {
                        $updates[] = array(
                                'modifyField', $fieldRecord[0], $fieldRecord[1],
                                        $fieldRecord[2], true
                        );
                }

                return $updates;
        }

        abstract protected function getCoreUpdateList();

        public function copyFile( $filename ) {
                $this->db->sourceFile( $filename, false, false, false,
                        array( $this, 'appendLine' )
                );
        }

        public function appendLine( $line ) {
                $line = rtrim( $line ) . ";\n";
                if( fwrite( $this->fileHandle, $line ) === false ) {
                        throw new MWException( "trouble writing file" );
                }
                return false;
        }

        protected function applyPatch( $path, $isFullPath = false, $msg = null ) {
                if ( $msg === null ) {
                        $msg = "Applying $path patch";
                }
                if ( $this->skipSchema ) {
                        $this->output( "...skipping schema change ($msg).\n" );
                        return false;
                }

                $this->output( "$msg ..." );

                if ( !$isFullPath ) {
                        $path = $this->db->patchPath( $path );
                }
                if( $this->fileHandle !== null ) {
                        $this->copyFile( $path );
                } else {
                        $this->db->sourceFile( $path );
                }
                $this->output( "done.\n" );
                return true;
        }

        protected function addTable( $name, $patch, $fullpath = false ) {
                if ( !$this->doTable( $name ) ) {
                        return true;
                }

                if ( $this->db->tableExists( $name, __METHOD__ ) ) {
                        $this->output( "...$name table already exists.\n" );
                } else {
                        return $this->applyPatch( $patch, $fullpath, "Creating $name table" );
                }
                return true;
        }

        protected function addField( $table, $field, $patch, $fullpath = false ) {
                if ( !$this->doTable( $table ) ) {
                        return true;
                }

                if ( !$this->db->tableExists( $table, __METHOD__ ) ) {
                        $this->output( "...$table table does not exist, skipping new field patch.\n" );
                } elseif ( $this->db->fieldExists( $table, $field, __METHOD__ ) ) {
                        $this->output( "...have $field field in $table table.\n" );
                } else {
                        return $this->applyPatch( $patch, $fullpath, "Adding $field field to table $table" );
                }
                return true;
        }

        protected function addIndex( $table, $index, $patch, $fullpath = false ) {
                if ( !$this->doTable( $table ) ) {
                        return true;
                }

                if ( !$this->db->tableExists( $table, __METHOD__ ) ) {
                        $this->output( "...skipping: '$table' table doesn't exist yet.\n" );
                } else if ( $this->db->indexExists( $table, $index, __METHOD__ ) ) {
                        $this->output( "...index $index already set on $table table.\n" );
                } else {
                        return $this->applyPatch( $patch, $fullpath, "Adding index $index to table $table" );
                }
                return true;
        }

        protected function dropField( $table, $field, $patch, $fullpath = false ) {
                if ( !$this->doTable( $table ) ) {
                        return true;
                }

                if ( $this->db->fieldExists( $table, $field, __METHOD__ ) ) {
                        return $this->applyPatch( $patch, $fullpath, "Table $table contains $field field. Dropping" );
                } else {
                        $this->output( "...$table table does not contain $field field.\n" );
                }
                return true;
        }

        protected function dropIndex( $table, $index, $patch, $fullpath = false ) {
                if ( !$this->doTable( $table ) ) {
                        return true;
                }

                if ( $this->db->indexExists( $table, $index, __METHOD__ ) ) {
                        return $this->applyPatch( $patch, $fullpath, "Dropping $index index from table $table" );
                } else {
                        $this->output( "...$index key doesn't exist.\n" );
                }
                return true;
        }

        protected function renameIndex( $table, $oldIndex, $newIndex, $skipBothIndexExistWarning, $patch, $fullpath = false ) {
                if ( !$this->doTable( $table ) ) {
                        return true;
                }

                // First requirement: the table must exist
                if ( !$this->db->tableExists( $table, __METHOD__ ) ) {
                        $this->output( "...skipping: '$table' table doesn't exist yet.\n" );
                        return true;
                }

                // Second requirement: the new index must be missing
                if ( $this->db->indexExists( $table, $newIndex, __METHOD__ ) ) {
                        $this->output( "...index $newIndex already set on $table table.\n" );
                        if ( !$skipBothIndexExistWarning && $this->db->indexExists( $table, $oldIndex, __METHOD__ ) ) {
                                $this->output( "...WARNING: $oldIndex still exists, despite it has been renamed into $newIndex (which also exists).\n" .
                                        "            $oldIndex should be manually removed if not needed anymore.\n" );
                        }
                        return true;
                }

                // Third requirement: the old index must exist
                if ( !$this->db->indexExists( $table, $oldIndex, __METHOD__ ) ) {
                        $this->output( "...skipping: index $oldIndex doesn't exist.\n" );
                        return true;
                }

                // Requirements have been satisfied, patch can be applied
                return $this->applyPatch( $patch, $fullpath, "Renaming index $oldIndex into $newIndex to table $table" );
        }

        public function dropTable( $table, $patch = false, $fullpath = false ) {
                if ( !$this->doTable( $table ) ) {
                        return true;
                }

                if ( $this->db->tableExists( $table, __METHOD__ ) ) {
                        $msg = "Dropping table $table";

                        if ( $patch === false ) {
                                $this->output( "$msg ..." );
                                $this->db->dropTable( $table, __METHOD__ );
                                $this->output( "done.\n" );
                        }
                        else {
                                return $this->applyPatch( $patch, $fullpath, $msg );
                        }
                } else {
                        $this->output( "...$table doesn't exist.\n" );
                }
                return true;
        }

        public function modifyField( $table, $field, $patch, $fullpath = false ) {
                if ( !$this->doTable( $table ) ) {
                        return true;
                }

                $updateKey = "$table-$field-$patch";
                if ( !$this->db->tableExists( $table, __METHOD__ ) ) {
                        $this->output( "...$table table does not exist, skipping modify field patch.\n" );
                } elseif ( !$this->db->fieldExists( $table, $field, __METHOD__ ) ) {
                        $this->output( "...$field field does not exist in $table table, skipping modify field patch.\n" );
                } elseif( $this->updateRowExists( $updateKey ) ) {
                        $this->output( "...$field in table $table already modified by patch $patch.\n" );
                } else {
                        $this->insertUpdateRow( $updateKey );
                        return $this->applyPatch( $patch, $fullpath, "Modifying $field field of table $table" );
                }
                return true;
        }

        public function purgeCache() {
                global $wgLocalisationCacheConf;
                # We can't guarantee that the user will be able to use TRUNCATE,
                # but we know that DELETE is available to us
                $this->output( "Purging caches..." );
                $this->db->delete( 'objectcache', '*', __METHOD__ );
                if ( $wgLocalisationCacheConf['manualRecache'] ) {
                        $this->rebuildLocalisationCache();
                }
                MessageBlobStore::clear();
                $this->output( "done.\n" );
        }

        protected function checkStats() {
                $this->output( "...site_stats is populated..." );
                $row = $this->db->selectRow( 'site_stats', '*', array( 'ss_row_id' => 1 ), __METHOD__ );
                if ( $row === false ) {
                        $this->output( "data is missing! rebuilding...\n" );
                } elseif ( isset( $row->site_stats ) && $row->ss_total_pages == -1 ) {
                        $this->output( "missing ss_total_pages, rebuilding...\n" );
                } else {
                        $this->output( "done.\n" );
                        return;
                }
                SiteStatsInit::doAllAndCommit( $this->db );
        }

        # Common updater functions

        protected function doActiveUsersInit() {
                $activeUsers = $this->db->selectField( 'site_stats', 'ss_active_users', false, __METHOD__ );
                if ( $activeUsers == -1 ) {
                        $activeUsers = $this->db->selectField( 'recentchanges',
                                'COUNT( DISTINCT rc_user_text )',
                                array( 'rc_user != 0', 'rc_bot' => 0, "rc_log_type != 'newusers'" ), __METHOD__
                        );
                        $this->db->update( 'site_stats',
                                array( 'ss_active_users' => intval( $activeUsers ) ),
                                array( 'ss_row_id' => 1 ), __METHOD__, array( 'LIMIT' => 1 )
                        );
                }
                $this->output( "...ss_active_users user count set...\n" );
        }

        protected function doLogUsertextPopulation() {
                if ( !$this->updateRowExists( 'populate log_usertext' ) ) {
                        $this->output(
                        "Populating log_user_text field, printing progress markers. For large\n" .
                        "databases, you may want to hit Ctrl-C and do this manually with\n" .
                        "maintenance/populateLogUsertext.php.\n" );

                        $task = $this->maintenance->runChild( 'PopulateLogUsertext' );
                        $task->execute();
                        $this->output( "done.\n" );
                }
        }

        protected function doLogSearchPopulation() {
                if ( !$this->updateRowExists( 'populate log_search' ) ) {
                        $this->output(
                                "Populating log_search table, printing progress markers. For large\n" .
                                "databases, you may want to hit Ctrl-C and do this manually with\n" .
                                "maintenance/populateLogSearch.php.\n" );

                        $task = $this->maintenance->runChild( 'PopulateLogSearch' );
                        $task->execute();
                        $this->output( "done.\n" );
                }
        }

        protected function doUpdateTranscacheField() {
                if ( $this->updateRowExists( 'convert transcache field' ) ) {
                        $this->output( "...transcache tc_time already converted.\n" );
                        return true;
                }

                return $this->applyPatch( 'patch-tc-timestamp.sql', false,
                        "Converting tc_time from UNIX epoch to MediaWiki timestamp" );
        }

        protected function doCollationUpdate() {
                global $wgCategoryCollation;
                if ( $this->db->fieldExists( 'categorylinks', 'cl_collation', __METHOD__ ) ) {
                        if ( $this->db->selectField(
                                'categorylinks',
                                'COUNT(*)',
                                'cl_collation != ' . $this->db->addQuotes( $wgCategoryCollation ),
                                __METHOD__
                                ) == 0 ) {
                                        $this->output( "...collations up-to-date.\n" );
                                        return;
                        }

                        $this->output( "Updating category collations..." );
                        $task = $this->maintenance->runChild( 'UpdateCollation' );
                        $task->execute();
                        $this->output( "...done.\n" );
                }
        }

        protected function doMigrateUserOptions() {
                if( $this->db->tableExists( 'user_properties' ) ) {
                        $cl = $this->maintenance->runChild( 'ConvertUserOptions', 'convertUserOptions.php' );
                        $cl->execute();
                        $this->output( "done.\n" );
                }
        }

        protected function rebuildLocalisationCache() {
                $cl = $this->maintenance->runChild( 'RebuildLocalisationCache', 'rebuildLocalisationCache.php' );
                $this->output( "Rebuilding localisation cache...\n" );
                $cl->setForce();
                $cl->execute();
                $this->output( "done.\n" );
        }

        protected function disableContentHandlerUseDB() {
                global $wgContentHandlerUseDB;

                if( $wgContentHandlerUseDB ) {
                        $this->output( "Turning off Content Handler DB fields for this part of upgrade.\n" );
                        $this->holdContentHandlerUseDB = $wgContentHandlerUseDB;
                        $wgContentHandlerUseDB = false;
                }
        }

        protected function enableContentHandlerUseDB() {
                global $wgContentHandlerUseDB;

                if( $this->holdContentHandlerUseDB ) {
                        $this->output( "Content Handler DB fields should be usable now.\n" );
                        $wgContentHandlerUseDB = $this->holdContentHandlerUseDB;
                }
        }
}