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<?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 );
}
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 );
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