mirror of
https://github.com/YunoHost-Apps/mediawiki_ynh.git
synced 2024-09-03 19:46:05 +02:00
262 lines
9.8 KiB
PHP
262 lines
9.8 KiB
PHP
<?php
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/**
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* Convert from the old links schema (string->ID) to the new schema (ID->ID).
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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* @ingroup Maintenance
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*/
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require_once __DIR__ . '/Maintenance.php';
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/**
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* Maintenance script to convert from the old links schema (string->ID)
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* to the new schema (ID->ID).
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*
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* The wiki should be put into read-only mode while this script executes.
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*
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* @ingroup Maintenance
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*/
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class ConvertLinks extends Maintenance {
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private $logPerformance;
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public function __construct() {
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parent::__construct();
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$this->mDescription = "Convert from the old links schema (string->ID) to the new schema (ID->ID).
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The wiki should be put into read-only mode while this script executes";
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$this->addArg( 'logperformance', "Log performance to perfLogFilename.", false );
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$this->addArg( 'perfLogFilename', "Filename where performance is logged if --logperformance was set (defaults to 'convLinksPerf.txt').", false );
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$this->addArg( 'keep-links-table', "Don't overwrite the old links table with the new one, leave the new table at links_temp.", false );
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$this->addArg( 'nokeys', "Don't create keys, and so allow duplicates in the new links table.\n
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This gives a huge speed improvement for very large links tables which are MyISAM." /* (What about InnoDB?) */, false );
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}
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public function getDbType() {
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return Maintenance::DB_ADMIN;
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}
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public function execute() {
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$dbw = wfGetDB( DB_MASTER );
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$type = $dbw->getType();
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if ( $type != 'mysql' ) {
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$this->output( "Link table conversion not necessary for $type\n" );
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return;
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}
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global $wgContLang;
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$numBadLinks = $curRowsRead = 0; # counters etc
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$totalTuplesInserted = 0; # total tuples INSERTed into links_temp
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$reportCurReadProgress = true; # whether or not to give progress reports while reading IDs from cur table
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$curReadReportInterval = 1000; # number of rows between progress reports
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$reportLinksConvProgress = true; # whether or not to give progress reports during conversion
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$linksConvInsertInterval = 1000; # number of rows per INSERT
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$initialRowOffset = 0;
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# $finalRowOffset = 0; # not used yet; highest row number from links table to process
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$overwriteLinksTable = !$this->hasOption( 'keep-links-table' );
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$noKeys = $this->hasOption( 'noKeys' );
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$this->logPerformance = $this->hasOption( 'logperformance' );
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$perfLogFilename = $this->getArg( 'perfLogFilename', "convLinksPerf.txt" );
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# --------------------------------------------------------------------
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list( $cur, $links, $links_temp, $links_backup ) = $dbw->tableNamesN( 'cur', 'links', 'links_temp', 'links_backup' );
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if ( $dbw->tableExists( 'pagelinks' ) ) {
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$this->output( "...have pagelinks; skipping old links table updates\n" );
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return;
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}
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$res = $dbw->query( "SELECT l_from FROM $links LIMIT 1" );
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if ( $dbw->fieldType( $res, 0 ) == "int" ) {
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$this->output( "Schema already converted\n" );
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return;
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}
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$res = $dbw->query( "SELECT COUNT(*) AS count FROM $links" );
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$row = $dbw->fetchObject( $res );
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$numRows = $row->count;
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$dbw->freeResult( $res );
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if ( $numRows == 0 ) {
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$this->output( "Updating schema (no rows to convert)...\n" );
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$this->createTempTable();
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} else {
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$fh = false;
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if ( $this->logPerformance ) {
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$fh = fopen ( $perfLogFilename, "w" );
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if ( !$fh ) {
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$this->error( "Couldn't open $perfLogFilename" );
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$this->logPerformance = false;
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}
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}
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$baseTime = $startTime = $this->getMicroTime();
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# Create a title -> cur_id map
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$this->output( "Loading IDs from $cur table...\n" );
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$this->performanceLog ( $fh, "Reading $numRows rows from cur table...\n" );
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$this->performanceLog ( $fh, "rows read vs seconds elapsed:\n" );
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$dbw->bufferResults( false );
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$res = $dbw->query( "SELECT cur_namespace,cur_title,cur_id FROM $cur" );
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$ids = array();
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foreach ( $res as $row ) {
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$title = $row->cur_title;
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if ( $row->cur_namespace ) {
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$title = $wgContLang->getNsText( $row->cur_namespace ) . ":$title";
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}
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$ids[$title] = $row->cur_id;
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$curRowsRead++;
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if ( $reportCurReadProgress ) {
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if ( ( $curRowsRead % $curReadReportInterval ) == 0 ) {
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$this->performanceLog( $fh, $curRowsRead . " " . ( $this->getMicroTime() - $baseTime ) . "\n" );
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$this->output( "\t$curRowsRead rows of $cur table read.\n" );
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}
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}
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}
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$dbw->freeResult( $res );
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$dbw->bufferResults( true );
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$this->output( "Finished loading IDs.\n\n" );
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$this->performanceLog( $fh, "Took " . ( $this->getMicroTime() - $baseTime ) . " seconds to load IDs.\n\n" );
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# --------------------------------------------------------------------
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# Now, step through the links table (in chunks of $linksConvInsertInterval rows),
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# convert, and write to the new table.
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$this->createTempTable();
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$this->performanceLog( $fh, "Resetting timer.\n\n" );
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$baseTime = $this->getMicroTime();
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$this->output( "Processing $numRows rows from $links table...\n" );
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$this->performanceLog( $fh, "Processing $numRows rows from $links table...\n" );
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$this->performanceLog( $fh, "rows inserted vs seconds elapsed:\n" );
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for ( $rowOffset = $initialRowOffset; $rowOffset < $numRows; $rowOffset += $linksConvInsertInterval ) {
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$sqlRead = "SELECT * FROM $links ";
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$sqlRead = $dbw->limitResult( $sqlRead, $linksConvInsertInterval, $rowOffset );
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$res = $dbw->query( $sqlRead );
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if ( $noKeys ) {
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$sqlWrite = array( "INSERT INTO $links_temp (l_from,l_to) VALUES " );
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} else {
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$sqlWrite = array( "INSERT IGNORE INTO $links_temp (l_from,l_to) VALUES " );
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}
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$tuplesAdded = 0; # no tuples added to INSERT yet
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foreach ( $res as $row ) {
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$fromTitle = $row->l_from;
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if ( array_key_exists( $fromTitle, $ids ) ) { # valid title
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$from = $ids[$fromTitle];
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$to = $row->l_to;
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if ( $tuplesAdded != 0 ) {
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$sqlWrite[] = ",";
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}
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$sqlWrite[] = "($from,$to)";
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$tuplesAdded++;
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} else { # invalid title
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$numBadLinks++;
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}
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}
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$dbw->freeResult( $res );
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# $this->output( "rowOffset: $rowOffset\ttuplesAdded: $tuplesAdded\tnumBadLinks: $numBadLinks\n" );
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if ( $tuplesAdded != 0 ) {
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if ( $reportLinksConvProgress ) {
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$this->output( "Inserting $tuplesAdded tuples into $links_temp..." );
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}
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$dbw->query( implode( "", $sqlWrite ) );
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$totalTuplesInserted += $tuplesAdded;
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if ( $reportLinksConvProgress ) {
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$this->output( " done. Total $totalTuplesInserted tuples inserted.\n" );
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$this->performanceLog( $fh, $totalTuplesInserted . " " . ( $this->getMicroTime() - $baseTime ) . "\n" );
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}
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}
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}
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$this->output( "$totalTuplesInserted valid titles and $numBadLinks invalid titles were processed.\n\n" );
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$this->performanceLog( $fh, "$totalTuplesInserted valid titles and $numBadLinks invalid titles were processed.\n" );
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$this->performanceLog( $fh, "Total execution time: " . ( $this->getMicroTime() - $startTime ) . " seconds.\n" );
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if ( $this->logPerformance ) {
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fclose ( $fh );
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}
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}
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# --------------------------------------------------------------------
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if ( $overwriteLinksTable ) {
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# Check for existing links_backup, and delete it if it exists.
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$this->output( "Dropping backup links table if it exists..." );
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$dbw->query( "DROP TABLE IF EXISTS $links_backup", __METHOD__ );
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$this->output( " done.\n" );
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# Swap in the new table, and move old links table to links_backup
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$this->output( "Swapping tables '$links' to '$links_backup'; '$links_temp' to '$links'..." );
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$dbw->query( "RENAME TABLE links TO $links_backup, $links_temp TO $links", __METHOD__ );
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$this->output( " done.\n\n" );
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$dbw->close();
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$this->output( "Conversion complete. The old table remains at $links_backup;\n" );
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$this->output( "delete at your leisure.\n" );
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} else {
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$this->output( "Conversion complete. The converted table is at $links_temp;\n" );
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$this->output( "the original links table is unchanged.\n" );
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}
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}
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private function createTempTable() {
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$dbConn = wfGetDB( DB_MASTER );
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if ( !( $dbConn->isOpen() ) ) {
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$this->output( "Opening connection to database failed.\n" );
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return;
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}
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$links_temp = $dbConn->tableName( 'links_temp' );
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$this->output( "Dropping temporary links table if it exists..." );
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$dbConn->query( "DROP TABLE IF EXISTS $links_temp" );
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$this->output( " done.\n" );
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$this->output( "Creating temporary links table..." );
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if ( $this->hasOption( 'noKeys' ) ) {
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$dbConn->query( "CREATE TABLE $links_temp ( " .
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"l_from int(8) unsigned NOT NULL default '0', " .
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"l_to int(8) unsigned NOT NULL default '0')" );
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} else {
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$dbConn->query( "CREATE TABLE $links_temp ( " .
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"l_from int(8) unsigned NOT NULL default '0', " .
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"l_to int(8) unsigned NOT NULL default '0', " .
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"UNIQUE KEY l_from(l_from,l_to), " .
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"KEY (l_to))" );
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}
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$this->output( " done.\n\n" );
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}
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private function performanceLog( $fh, $text ) {
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if ( $this->logPerformance ) {
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fwrite( $fh, $text );
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}
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}
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private function getMicroTime() { # return time in seconds, with microsecond accuracy
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list( $usec, $sec ) = explode( " ", microtime() );
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return ( (float)$usec + (float)$sec );
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}
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}
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$maintClass = "ConvertLinks";
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require_once RUN_MAINTENANCE_IF_MAIN;
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