<?php
+/**
+ * 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 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( dirname( __FILE__ ) . '/Maintenance.php' );
+
+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 );
+ }
-# Convert from the old links schema (string->ID) to the new schema (ID->ID)
-# This hasn't been tested yet, so expect bugs
+ public function getDbType() {
+ return Maintenance::DB_ADMIN;
+ }
-# The wiki should be put into read-only mode while this script executes
+ public function execute() {
+ $dbw = wfGetDB( DB_MASTER );
-include_once( "commandLine.inc" );
+ $type = $dbw->getType();
+ if ( $type != 'mysql' ) {
+ $this->output( "Link table conversion not necessary for $type\n" );
+ return;
+ }
-# Check if it's already done
+ global $wgContLang;
-$res = wfQuery( "SELECT * FROM links LIMIT 1", DB_WRITE );
-if ( !wfNumRows( $res ) ) {
- print "No rows to convert. Updating schema...\n";
- createTable();
-} else {
- $row = wfFetchObject( $res );
- if ( is_numeric( $row->l_from ) ) {
- print "Schema already converted\n";
- exit;
- }
-
- # Create a title -> cur_id map
+ $numBadLinks = $curRowsRead = 0; # counters etc
+ $totalTuplesInserted = 0; # total tuples INSERTed into links_temp
- print "Loading IDs...";
+ $reportCurReadProgress = true; # whether or not to give progress reports while reading IDs from cur table
+ $curReadReportInterval = 1000; # number of rows between progress reports
- wfBufferSQLResults( false );
- $res = wfQuery( "SELECT cur_namespace,cur_title,cur_id FROM cur", DB_WRITE );
- $ids = array();
+ $reportLinksConvProgress = true; # whether or not to give progress reports during conversion
+ $linksConvInsertInterval = 1000; # number of rows per INSERT
- while ( $row = wfFetchObject( $res ) ) {
- $title = $row->cur_title;
- if ( $row->cur_namespace ) {
- $title = $wgLang->getNsText( $row->cur_namespace ) . ":$title";
- }
- $ids[$title] = $row->cur_id;
- }
- wfFreeResult( $res );
+ $initialRowOffset = 0;
+ # $finalRowOffset = 0; # not used yet; highest row number from links table to process
- print "done\n";
+ $overwriteLinksTable = !$this->hasOption( 'keep-links-table' );
+ $noKeys = $this->hasOption( 'noKeys' );
+ $this->logPerformance = $this->hasOption( 'logperformance' );
+ $perfLogFilename = $this->getArg( 'perfLogFilename', "convLinksPerf.txt" );
- # Now, load in all the links and create a links table in RAM
- print "Processing links...\n";
- $res = wfQuery( "SELECT * FROM links", DB_WRITE );
- $links = array();
- $numBad = 0;
+ # --------------------------------------------------------------------
- while ( $row = wfFetchObject( $res ) ) {
- if ( array_key_exists( $row->l_from, $ids ) ) {
- $links[$row->l_from][$row->l_to] = 1;
- } else {
- $numBad ++;
+ 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;
}
- }
- print "Done, $numBad invalid titles\n";
+ $res = $dbw->query( "SELECT l_from FROM $links LIMIT 1" );
+ if ( $dbw->fieldType( $res, 0 ) == "int" ) {
+ $this->output( "Schema already converted\n" );
+ return;
+ }
- # Save it to a new table
- createTable();
- $sql = "INSERT INTO links_temp(l_from,l_to) VALUES ";
+ $res = $dbw->query( "SELECT COUNT(*) AS count FROM $links" );
+ $row = $dbw->fetchObject( $res );
+ $numRows = $row->count;
+ $dbw->freeResult( $res );
- $first = true;
- foreach( $links as $from => $toArray ) {
- foreach ( $toArray as $to => $one ) {
- if ( $first ) {
- $first = false;
- } else {
- $sql .= ",";
+ 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" );
+ }
}
- $sql .= "($from,$to)";
+ $this->output( "$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" );
}
}
- wfQuery( $sql, DB_WRITE );
-}
+ private function createTempTable() {
+ $dbConn = wfGetDB( DB_MASTER );
-# Swap in the new table
-wfQuery( "RENAME TABLE links TO links_backup, links_temp TO links" );
+ if ( !( $dbConn->isOpen() ) ) {
+ $this->output( "Opening connection to database failed.\n" );
+ return;
+ }
+ $links_temp = $dbConn->tableName( 'links_temp' );
-print "Conversion complete. The old table remains at links_backup, delete at your leisure.\n";
+ $this->output( "Dropping temporary links table if it exists..." );
+ $dbConn->query( "DROP TABLE IF EXISTS $links_temp" );
+ $this->output( " done.\n" );
-function createTable() {
- wfQuery( "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))", DB_WRITE);
+ $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 );
dépôts / lhc / web / wiklou.git / blobdiff