sql.php

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<?php
// @codeCoverageIgnoreStart
require_once __DIR__ . '/Maintenance.php';
// @codeCoverageIgnoreEnd
 
use MediaWiki\Installer\DatabaseUpdater;
use MediaWiki\Maintenance\Maintenance;
use Wikimedia\Rdbms\DBQueryError;
use Wikimedia\Rdbms\IDatabase;
use Wikimedia\Rdbms\IResultWrapper;
use Wikimedia\Rdbms\ServerInfo;
 
class MwSql extends Maintenance {
    public function __construct() {
        parent::__construct();
        $this->addDescription( 'Send SQL queries to a MediaWiki database. ' .
            'Takes a file name containing SQL as argument or runs interactively.' );
        $this->addOption( 'query',
            'Run a single query instead of running interactively', false, true );
        $this->addOption( 'json', 'Output the results as JSON instead of PHP objects' );
        $this->addOption( 'status', 'Return successful exit status only if the query succeeded '
            . '(selected or altered rows), otherwise 1 for errors, 2 for no rows' );
        $this->addOption( 'cluster', 'Use an external cluster by name', false, true );
        $this->addOption( 'wikidb',
            'The database wiki ID to use if not the current one', false, true );
        $this->addOption( 'replicadb',
            'Replica DB server to use instead of the primary DB (can be "any")', false, true );
        $this->setBatchSize( 100 );
    }
 
    public function execute() {
        global $IP;
 
        // We want to allow "" for the wikidb, meaning don't call select_db()
        $wiki = $this->hasOption( 'wikidb' ) ? $this->getOption( 'wikidb' ) : false;
        // Get the appropriate load balancer (for this wiki)
        $lbFactory = $this->getServiceContainer()->getDBLoadBalancerFactory();
        if ( $this->hasOption( 'cluster' ) ) {
            $lb = $lbFactory->getExternalLB( $this->getOption( 'cluster' ) );
        } else {
            $lb = $lbFactory->getMainLB( $wiki );
        }
        // Figure out which server to use
        $replicaDB = $this->getOption( 'replicadb', '' );
        if ( $replicaDB === 'any' ) {
            $index = DB_REPLICA;
        } elseif ( $replicaDB !== '' ) {
            $index = null;
            $serverCount = $lb->getServerCount();
            for ( $i = 0; $i < $serverCount; ++$i ) {
                if ( $lb->getServerName( $i ) === $replicaDB ) {
                    $index = $i;
                    break;
                }
            }
            // @phan-suppress-next-line PhanSuspiciousValueComparison
            if ( $index === null || $index === ServerInfo::WRITER_INDEX ) {
                $this->fatalError( "No replica DB server configured with the name '$replicaDB'." );
            }
        } else {
            $index = DB_PRIMARY;
        }
 
        $db = $lb->getMaintenanceConnectionRef( $index, [], $wiki );
        if ( $replicaDB != '' && $db->getLBInfo( 'master' ) !== null ) {
            $this->fatalError( "Server {$db->getServerName()} is not a replica DB." );
        }
 
        if ( $index === DB_PRIMARY ) {
            $updater = DatabaseUpdater::newForDB( $db, true, $this );
            $db->setSchemaVars( $updater->getSchemaVars() );
        }
 
        if ( $this->hasArg( 0 ) ) {
            $file = fopen( $this->getArg( 0 ), 'r' );
            if ( !$file ) {
                $this->fatalError( "Unable to open input file" );
            }
 
            $error = $db->sourceStream( $file, null, [ $this, 'sqlPrintResult' ], __METHOD__ );
            if ( $error !== true ) {
                $this->fatalError( $error );
            }
            return;
        }
 
        if ( $this->hasOption( 'query' ) ) {
            $query = $this->getOption( 'query' );
            $res = $this->sqlDoQuery( $db, $query, /* dieOnError */ true );
            $this->waitForReplication();
            if ( $this->hasOption( 'status' ) && !$res ) {
                $this->fatalError( 'Failed.', 2 );
            }
            return;
        }
 
        if (
            function_exists( 'readline_add_history' ) &&
            Maintenance::posix_isatty( 0 /*STDIN*/ )
        ) {
            $home = getenv( 'HOME' );
            $historyFile = $home ?
                "$home/.mwsql_history" : "$IP/maintenance/.mwsql_history";
            readline_read_history( $historyFile );
        } else {
            $historyFile = null;
        }
 
        $wholeLine = '';
        $newPrompt = '> ';
        $prompt = $newPrompt;
        $doDie = !Maintenance::posix_isatty( 0 );
        $res = 1;
        $batchCount = 0;
        // phpcs:ignore Generic.CodeAnalysis.AssignmentInCondition.FoundInWhileCondition
        while ( ( $line = Maintenance::readconsole( $prompt ) ) !== false ) {
            if ( !$line ) {
                # User simply pressed return key
                continue;
            }
            $done = $db->streamStatementEnd( $wholeLine, $line );
 
            $wholeLine .= $line;
 
            if ( !$done ) {
                $wholeLine .= ' ';
                $prompt = '    -> ';
                continue;
            }
            if ( $historyFile ) {
                # Delimiter is eaten by streamStatementEnd, we add it
                # up in the history (T39020)
                readline_add_history( $wholeLine . ';' );
                readline_write_history( $historyFile );
            }
            // @phan-suppress-next-line SecurityCheck-SQLInjection
            $res = $this->sqlDoQuery( $db, $wholeLine, $doDie );
            if ( $this->getBatchSize() && ++$batchCount >= $this->getBatchSize() ) {
                $batchCount = 0;
                $this->waitForReplication();
            }
            $prompt = $newPrompt;
            $wholeLine = '';
        }
        $this->waitForReplication();
        if ( $this->hasOption( 'status' ) && !$res ) {
            $this->fatalError( 'Failed.', 2 );
        }
    }
 
    protected function sqlDoQuery( IDatabase $db, $line, $dieOnError ) {
        try {
            $res = $db->query( $line, __METHOD__ );
            return $this->sqlPrintResult( $res, $db );
        } catch ( DBQueryError $e ) {
            if ( $dieOnError ) {
                $this->fatalError( (string)$e );
            } else {
                $this->error( (string)$e );
            }
        }
        return null;
    }
 
    public function sqlPrintResult( $res, $db ) {
        if ( !$res ) {
            // Do nothing
            return null;
        } elseif ( is_object( $res ) ) {
            $out = '';
            $rows = [];
            foreach ( $res as $row ) {
                $out .= print_r( $row, true );
                $rows[] = $row;
            }
            if ( $this->hasOption( 'json' ) ) {
                $out = json_encode( $rows, JSON_PRETTY_PRINT );
            } elseif ( !$rows ) {
                $out = 'Query OK, 0 row(s) affected';
            }
            $this->output( $out . "\n" );
            return count( $rows );
        } else {
            $affected = $db->affectedRows();
            if ( $this->hasOption( 'json' ) ) {
                $this->output( json_encode( [ 'affected' => $affected ], JSON_PRETTY_PRINT ) . "\n" );
            } else {
                $this->output( "Query OK, $affected row(s) affected\n" );
            }
            return $affected;
        }
    }
 
    public function getDbType() {
        return Maintenance::DB_ADMIN;
    }
}
 
// @codeCoverageIgnoreStart
$maintClass = MwSql::class;
require_once RUN_MAINTENANCE_IF_MAIN;
// @codeCoverageIgnoreEnd