ID) to the new schema (ID->ID). * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. * http://www.gnu.org/copyleft/gpl.html * * @file * @ingroup Maintenance */ require_once __DIR__ . '/Maintenance.php'; /** * Maintenance script to convert from the old links schema (string->ID) * to the new schema (ID->ID). * * The wiki should be put into read-only mode while this script executes. * * @ingroup Maintenance */ class ConvertLinks extends Maintenance { private $logPerformance; public function __construct() { parent::__construct(); $this->mDescription = "Convert from the old links schema (string->ID) to the new schema (ID->ID). The wiki should be put into read-only mode while this script executes"; $this->addArg( 'logperformance', "Log performance to perfLogFilename.", false ); $this->addArg( 'perfLogFilename', "Filename where performance is logged if --logperformance was set (defaults to 'convLinksPerf.txt').", false ); $this->addArg( 'keep-links-table', "Don't overwrite the old links table with the new one, leave the new table at links_temp.", false ); $this->addArg( 'nokeys', "Don't create keys, and so allow duplicates in the new links table.\n This gives a huge speed improvement for very large links tables which are MyISAM." /* (What about InnoDB?) */, false ); } public function getDbType() { return Maintenance::DB_ADMIN; } public function execute() { $dbw = wfGetDB( DB_MASTER ); $type = $dbw->getType(); if ( $type != 'mysql' ) { $this->output( "Link table conversion not necessary for $type\n" ); return; } global $wgContLang; $numBadLinks = $curRowsRead = 0; # counters etc $totalTuplesInserted = 0; # total tuples INSERTed into links_temp $reportCurReadProgress = true; # whether or not to give progress reports while reading IDs from cur table $curReadReportInterval = 1000; # number of rows between progress reports $reportLinksConvProgress = true; # whether or not to give progress reports during conversion $linksConvInsertInterval = 1000; # number of rows per INSERT $initialRowOffset = 0; # $finalRowOffset = 0; # not used yet; highest row number from links table to process $overwriteLinksTable = !$this->hasOption( 'keep-links-table' ); $noKeys = $this->hasOption( 'noKeys' ); $this->logPerformance = $this->hasOption( 'logperformance' ); $perfLogFilename = $this->getArg( 'perfLogFilename', "convLinksPerf.txt" ); # -------------------------------------------------------------------- list( $cur, $links, $links_temp, $links_backup ) = $dbw->tableNamesN( 'cur', 'links', 'links_temp', 'links_backup' ); if ( $dbw->tableExists( 'pagelinks' ) ) { $this->output( "...have pagelinks; skipping old links table updates\n" ); return; } $res = $dbw->query( "SELECT l_from FROM $links LIMIT 1" ); if ( $dbw->fieldType( $res, 0 ) == "int" ) { $this->output( "Schema already converted\n" ); return; } $res = $dbw->query( "SELECT COUNT(*) AS count FROM $links" ); $row = $dbw->fetchObject( $res ); $numRows = $row->count; $dbw->freeResult( $res ); if ( $numRows == 0 ) { $this->output( "Updating schema (no rows to convert)...\n" ); $this->createTempTable(); } else { $fh = false; if ( $this->logPerformance ) { $fh = fopen ( $perfLogFilename, "w" ); if ( !$fh ) { $this->error( "Couldn't open $perfLogFilename" ); $this->logPerformance = false; } } $baseTime = $startTime = $this->getMicroTime(); # Create a title -> cur_id map $this->output( "Loading IDs from $cur table...\n" ); $this->performanceLog ( $fh, "Reading $numRows rows from cur table...\n" ); $this->performanceLog ( $fh, "rows read vs seconds elapsed:\n" ); $dbw->bufferResults( false ); $res = $dbw->query( "SELECT cur_namespace,cur_title,cur_id FROM $cur" ); $ids = array(); foreach ( $res as $row ) { $title = $row->cur_title; if ( $row->cur_namespace ) { $title = $wgContLang->getNsText( $row->cur_namespace ) . ":$title"; } $ids[$title] = $row->cur_id; $curRowsRead++; if ( $reportCurReadProgress ) { if ( ( $curRowsRead % $curReadReportInterval ) == 0 ) { $this->performanceLog( $fh, $curRowsRead . " " . ( $this->getMicroTime() - $baseTime ) . "\n" ); $this->output( "\t$curRowsRead rows of $cur table read.\n" ); } } } $dbw->freeResult( $res ); $dbw->bufferResults( true ); $this->output( "Finished loading IDs.\n\n" ); $this->performanceLog( $fh, "Took " . ( $this->getMicroTime() - $baseTime ) . " seconds to load IDs.\n\n" ); # -------------------------------------------------------------------- # Now, step through the links table (in chunks of $linksConvInsertInterval rows), # convert, and write to the new table. $this->createTempTable(); $this->performanceLog( $fh, "Resetting timer.\n\n" ); $baseTime = $this->getMicroTime(); $this->output( "Processing $numRows rows from $links table...\n" ); $this->performanceLog( $fh, "Processing $numRows rows from $links table...\n" ); $this->performanceLog( $fh, "rows inserted vs seconds elapsed:\n" ); for ( $rowOffset = $initialRowOffset; $rowOffset < $numRows; $rowOffset += $linksConvInsertInterval ) { $sqlRead = "SELECT * FROM $links "; $sqlRead = $dbw->limitResult( $sqlRead, $linksConvInsertInterval, $rowOffset ); $res = $dbw->query( $sqlRead ); if ( $noKeys ) { $sqlWrite = array( "INSERT INTO $links_temp (l_from,l_to) VALUES " ); } else { $sqlWrite = array( "INSERT IGNORE INTO $links_temp (l_from,l_to) VALUES " ); } $tuplesAdded = 0; # no tuples added to INSERT yet foreach ( $res as $row ) { $fromTitle = $row->l_from; if ( array_key_exists( $fromTitle, $ids ) ) { # valid title $from = $ids[$fromTitle]; $to = $row->l_to; if ( $tuplesAdded != 0 ) { $sqlWrite[] = ","; } $sqlWrite[] = "($from,$to)"; $tuplesAdded++; } else { # invalid title $numBadLinks++; } } $dbw->freeResult( $res ); # $this->output( "rowOffset: $rowOffset\ttuplesAdded: $tuplesAdded\tnumBadLinks: $numBadLinks\n" ); if ( $tuplesAdded != 0 ) { if ( $reportLinksConvProgress ) { $this->output( "Inserting $tuplesAdded tuples into $links_temp..." ); } $dbw->query( implode( "", $sqlWrite ) ); $totalTuplesInserted += $tuplesAdded; if ( $reportLinksConvProgress ) { $this->output( " done. Total $totalTuplesInserted tuples inserted.\n" ); $this->performanceLog( $fh, $totalTuplesInserted . " " . ( $this->getMicroTime() - $baseTime ) . "\n" ); } } } $this->output( "$totalTuplesInserted valid titles and $numBadLinks invalid titles were processed.\n\n" ); $this->performanceLog( $fh, "$totalTuplesInserted valid titles and $numBadLinks invalid titles were processed.\n" ); $this->performanceLog( $fh, "Total execution time: " . ( $this->getMicroTime() - $startTime ) . " seconds.\n" ); if ( $this->logPerformance ) { fclose ( $fh ); } } # -------------------------------------------------------------------- if ( $overwriteLinksTable ) { # Check for existing links_backup, and delete it if it exists. $this->output( "Dropping backup links table if it exists..." ); $dbw->query( "DROP TABLE IF EXISTS $links_backup", __METHOD__ ); $this->output( " done.\n" ); # Swap in the new table, and move old links table to links_backup $this->output( "Swapping tables '$links' to '$links_backup'; '$links_temp' to '$links'..." ); $dbw->query( "RENAME TABLE links TO $links_backup, $links_temp TO $links", __METHOD__ ); $this->output( " done.\n\n" ); $dbw->close(); $this->output( "Conversion complete. The old table remains at $links_backup;\n" ); $this->output( "delete at your leisure.\n" ); } else { $this->output( "Conversion complete. The converted table is at $links_temp;\n" ); $this->output( "the original links table is unchanged.\n" ); } } private function createTempTable() { $dbConn = wfGetDB( DB_MASTER ); if ( !( $dbConn->isOpen() ) ) { $this->output( "Opening connection to database failed.\n" ); return; } $links_temp = $dbConn->tableName( 'links_temp' ); $this->output( "Dropping temporary links table if it exists..." ); $dbConn->query( "DROP TABLE IF EXISTS $links_temp" ); $this->output( " done.\n" ); $this->output( "Creating temporary links table..." ); if ( $this->hasOption( 'noKeys' ) ) { $dbConn->query( "CREATE TABLE $links_temp ( " . "l_from int(8) unsigned NOT NULL default '0', " . "l_to int(8) unsigned NOT NULL default '0')" ); } else { $dbConn->query( "CREATE TABLE $links_temp ( " . "l_from int(8) unsigned NOT NULL default '0', " . "l_to int(8) unsigned NOT NULL default '0', " . "UNIQUE KEY l_from(l_from,l_to), " . "KEY (l_to))" ); } $this->output( " done.\n\n" ); } private function performanceLog( $fh, $text ) { if ( $this->logPerformance ) { fwrite( $fh, $text ); } } private function getMicroTime() { # return time in seconds, with microsecond accuracy list( $usec, $sec ) = explode( " ", microtime() ); return ( (float)$usec + (float)$sec ); } } $maintClass = "ConvertLinks"; require_once RUN_MAINTENANCE_IF_MAIN;