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<?php
/**
* Generic class to cleanup a database table.
*
* 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' );
/**
* Generic class to cleanup a database table. Already subclasses Maintenance.
*
* @ingroup Maintenance
*/
class TableCleanup extends Maintenance {
protected $defaultParams = array(
'table' => 'page',
'conds' => array(),
'index' => 'page_id',
'callback' => 'processRow',
);
protected $dryrun = false;
protected $maxLag = 10; # if slaves are lagged more than 10 secs, wait
public $batchSize = 100;
public $reportInterval = 100;
public function __construct() {
parent::__construct();
$this->addOption( 'dry-run', 'Perform a dry run' );
}
public function execute() {
global $wgUser;
$wgUser = User::newFromName( 'Conversion script' );
$this->dryrun = $this->hasOption( 'dry-run' );
if ( $this->dryrun ) {
$this->output( "Checking for bad titles...\n" );
} else {
$this->output( "Checking and fixing bad titles...\n" );
}
$this->runTable( $this->defaultParams );
}
protected function init( $count, $table ) {
$this->processed = 0;
$this->updated = 0;
$this->count = $count;
$this->startTime = microtime( true );
$this->table = $table;
}
protected function progress( $updated ) {
$this->updated += $updated;
$this->processed++;
if ( $this->processed % $this->reportInterval != 0 ) {
return;
}
$portion = $this->processed / $this->count;
$updateRate = $this->updated / $this->processed;
$now = microtime( true );
$delta = $now - $this->startTime;
$estimatedTotalTime = $delta / $portion;
$eta = $this->startTime + $estimatedTotalTime;
$this->output(
sprintf( "%s %s: %6.2f%% done on %s; ETA %s [%d/%d] %.2f/sec <%.2f%% updated>\n",
wfWikiID(),
wfTimestamp( TS_DB, intval( $now ) ),
$portion * 100.0,
$this->table,
wfTimestamp( TS_DB, intval( $eta ) ),
$this->processed,
$this->count,
$this->processed / $delta,
$updateRate * 100.0
)
);
flush();
}
public function runTable( $params ) {
$dbr = wfGetDB( DB_SLAVE );
if ( array_diff( array_keys( $params ),
array( 'table', 'conds', 'index', 'callback' ) ) )
{
throw new MWException( __METHOD__ . ': Missing parameter ' . implode( ', ', $params ) );
}
$table = $params['table'];
// count(*) would melt the DB for huge tables, we can estimate here
$count = $dbr->estimateRowCount( $table, '*', '', __METHOD__ );
$this->init( $count, $table );
$this->output( "Processing $table...\n" );
$index = (array)$params['index'];
$indexConds = array();
$options = array(
'ORDER BY' => implode( ',', $index ),
'LIMIT' => $this->batchSize
);
$callback = array( $this, $params['callback'] );
while ( true ) {
$conds = array_merge( $params['conds'], $indexConds );
$res = $dbr->select( $table, '*', $conds, __METHOD__, $options );
if ( !$res->numRows() ) {
// Done
break;
}
foreach ( $res as $row ) {
call_user_func( $callback, $row );
}
if ( $res->numRows() < $this->batchSize ) {
// Done
break;
}
// Update the conditions to select the next batch.
// Construct a condition string by starting with the least significant part
// of the index, and adding more significant parts progressively to the left
// of the string.
$nextCond = '';
foreach ( array_reverse( $index ) as $field ) {
$encValue = $dbr->addQuotes( $row->$field );
if ( $nextCond === '' ) {
$nextCond = "$field > $encValue";
} else {
$nextCond = "$field > $encValue OR ($field = $encValue AND ($nextCond))";
}
}
$indexConds = array( $nextCond );
}
$this->output( "Finished $table... $this->updated of $this->processed rows updated\n" );
}
protected function hexChar( $matches ) {
return sprintf( "\\x%02x", ord( $matches[1] ) );
}
}
class TableCleanupTest extends TableCleanup {
function processRow( $row ) {
$this->progress( mt_rand( 0, 1 ) );
}
}
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