SqliteMaintenance.php

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<?php
use MediaWiki\MediaWikiServices;
 
use Wikimedia\Rdbms\DatabaseSqlite;
 
require_once __DIR__ . '/Maintenance.php';
 
class SqliteMaintenance extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Performs some operations specific to SQLite database backend' );
        $this->addOption(
            'vacuum',
            'Clean up database by removing deleted pages. Decreases database file size'
        );
        $this->addOption( 'integrity', 'Check database for integrity' );
        $this->addOption( 'backup-to', 'Backup database to the given file', false, true );
        $this->addOption( 'check-syntax', 'Check SQL file(s) for syntax errors', false, true );
    }
 
    public function execute() {
        // Should work even if we use a non-SQLite database
        if ( $this->hasOption( 'check-syntax' ) ) {
            $this->checkSyntax();
 
            return;
        }
 
        $lb = MediaWikiServices::getInstance()->getDBLoadBalancer();
        $dbw = $lb->getConnection( DB_PRIMARY );
        if ( !( $dbw instanceof DatabaseSqlite ) ) {
            $this->error( "This maintenance script requires a SQLite database.\n" );
 
            return;
        }
 
        if ( $this->hasOption( 'vacuum' ) ) {
            $this->vacuum( $dbw );
        }
 
        if ( $this->hasOption( 'integrity' ) ) {
            $this->integrityCheck( $dbw );
        }
 
        if ( $this->hasOption( 'backup-to' ) ) {
            $this->backup( $dbw, $this->getOption( 'backup-to' ) );
        }
    }
 
    private function vacuum( DatabaseSqlite $dbw ) {
        $prevSize = filesize( $dbw->getDbFilePath() );
        if ( $prevSize == 0 ) {
            $this->fatalError( "Can't vacuum an empty database.\n" );
        }
 
        $this->output( 'VACUUM: ' );
        if ( $dbw->query( 'VACUUM', __METHOD__ ) ) {
            clearstatcache();
            $newSize = filesize( $dbw->getDbFilePath() );
            $this->output( sprintf( "Database size was %d, now %d (%.1f%% reduction).\n",
                $prevSize, $newSize, ( $prevSize - $newSize ) * 100.0 / $prevSize ) );
        } else {
            $this->output( 'Error\n' );
        }
    }
 
    private function integrityCheck( DatabaseSqlite $dbw ) {
        $this->output( "Performing database integrity checks:\n" );
        $res = $dbw->query( 'PRAGMA integrity_check', __METHOD__ );
 
        if ( !$res || $res->numRows() == 0 ) {
            $this->error( "Error: integrity check query returned nothing.\n" );
 
            return;
        }
 
        foreach ( $res as $row ) {
            $this->output( $row->integrity_check );
        }
    }
 
    private function backup( DatabaseSqlite $dbw, $fileName ) {
        $this->output( "Backing up database:\n   Locking..." );
        $dbw->query( 'BEGIN IMMEDIATE TRANSACTION', __METHOD__ );
        $ourFile = $dbw->getDbFilePath();
        $this->output( "   Copying database file $ourFile to $fileName..." );
        Wikimedia\suppressWarnings();
        if ( !copy( $ourFile, $fileName ) ) {
            $err = error_get_last();
            $this->error( "      {$err['message']}" );
        }
        Wikimedia\restoreWarnings();
        $this->output( "   Releasing lock...\n" );
        $dbw->query( 'COMMIT TRANSACTION', __METHOD__ );
    }
 
    private function checkSyntax() {
        if ( !Sqlite::isPresent() ) {
            $this->error( "Error: SQLite support not found\n" );
        }
        $files = [ $this->getOption( 'check-syntax' ) ];
        $files = array_merge( $files, $this->mArgs );
        $result = Sqlite::checkSqlSyntax( $files );
        if ( $result === true ) {
            $this->output( "SQL syntax check: no errors detected.\n" );
        } else {
            $this->error( "Error: $result\n" );
        }
    }
}
 
$maintClass = SqliteMaintenance::class;
require_once RUN_MAINTENANCE_IF_MAIN;