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<?php
/**
* Fills the rev_sha1 and ar_sha1 columns of revision
* and archive tables for revisions created before MW 1.19.
*
* 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 that fills the rev_sha1 and ar_sha1 columns of revision
* and archive tables for revisions created before MW 1.19.
*
* @ingroup Maintenance
*/
class PopulateRevisionSha1 extends LoggedUpdateMaintenance {
public function __construct() {
parent::__construct();
$this->addDescription( 'Populates the rev_sha1 and ar_sha1 fields' );
$this->setBatchSize( 200 );
}
protected function getUpdateKey() {
return 'populate rev_sha1';
}
protected function doDBUpdates() {
$db = $this->getDB( DB_MASTER );
if ( !$db->tableExists( 'revision' ) ) {
$this->error( "revision table does not exist", true );
} elseif ( !$db->tableExists( 'archive' ) ) {
$this->error( "archive table does not exist", true );
} elseif ( !$db->fieldExists( 'revision', 'rev_sha1', __METHOD__ ) ) {
$this->output( "rev_sha1 column does not exist\n\n", true );
return false;
}
$this->output( "Populating rev_sha1 column\n" );
$rc = $this->doSha1Updates( 'revision', 'rev_id', 'rev' );
$this->output( "Populating ar_sha1 column\n" );
$ac = $this->doSha1Updates( 'archive', 'ar_rev_id', 'ar' );
$this->output( "Populating ar_sha1 column legacy rows\n" );
$ac += $this->doSha1LegacyUpdates();
$this->output( "rev_sha1 and ar_sha1 population complete "
. "[$rc revision rows, $ac archive rows].\n" );
return true;
}
/**
* @param string $table
* @param string $idCol
* @param string $prefix
* @return int Rows changed
*/
protected function doSha1Updates( $table, $idCol, $prefix ) {
$db = $this->getDB( DB_MASTER );
$start = $db->selectField( $table, "MIN($idCol)", false, __METHOD__ );
$end = $db->selectField( $table, "MAX($idCol)", false, __METHOD__ );
if ( !$start || !$end ) {
$this->output( "...$table table seems to be empty.\n" );
return 0;
}
$count = 0;
# Do remaining chunk
$end += $this->mBatchSize - 1;
$blockStart = $start;
$blockEnd = $start + $this->mBatchSize - 1;
while ( $blockEnd <= $end ) {
$this->output( "...doing $idCol from $blockStart to $blockEnd\n" );
$cond = "$idCol BETWEEN $blockStart AND $blockEnd
AND $idCol IS NOT NULL AND {$prefix}_sha1 = ''";
$res = $db->select( $table, '*', $cond, __METHOD__ );
$this->beginTransaction( $db, __METHOD__ );
foreach ( $res as $row ) {
if ( $this->upgradeRow( $row, $table, $idCol, $prefix ) ) {
$count++;
}
}
$this->commitTransaction( $db, __METHOD__ );
$blockStart += $this->mBatchSize;
$blockEnd += $this->mBatchSize;
wfWaitForSlaves();
}
return $count;
}
/**
* @return int
*/
protected function doSha1LegacyUpdates() {
$count = 0;
$db = $this->getDB( DB_MASTER );
$res = $db->select( 'archive', '*',
[ 'ar_rev_id IS NULL', 'ar_sha1' => '' ], __METHOD__ );
$updateSize = 0;
$this->beginTransaction( $db, __METHOD__ );
foreach ( $res as $row ) {
if ( $this->upgradeLegacyArchiveRow( $row ) ) {
++$count;
}
if ( ++$updateSize >= 100 ) {
$updateSize = 0;
$this->commitTransaction( $db, __METHOD__ );
$this->output( "Commited row with ar_timestamp={$row->ar_timestamp}\n" );
wfWaitForSlaves();
$this->beginTransaction( $db, __METHOD__ );
}
}
$this->commitTransaction( $db, __METHOD__ );
return $count;
}
/**
* @param stdClass $row
* @param string $table
* @param string $idCol
* @param string $prefix
* @return bool
*/
protected function upgradeRow( $row, $table, $idCol, $prefix ) {
$db = $this->getDB( DB_MASTER );
try {
$rev = ( $table === 'archive' )
? Revision::newFromArchiveRow( $row )
: new Revision( $row );
$text = $rev->getSerializedData();
} catch ( Exception $e ) {
$this->output( "Data of revision with {$idCol}={$row->$idCol} unavailable!\n" );
return false; // bug 22624?
}
if ( !is_string( $text ) ) {
# This should not happen, but sometimes does (bug 20757)
$this->output( "Data of revision with {$idCol}={$row->$idCol} unavailable!\n" );
return false;
} else {
$db->update( $table,
[ "{$prefix}_sha1" => Revision::base36Sha1( $text ) ],
[ $idCol => $row->$idCol ],
__METHOD__
);
return true;
}
}
/**
* @param stdClass $row
* @return bool
*/
protected function upgradeLegacyArchiveRow( $row ) {
$db = $this->getDB( DB_MASTER );
try {
$rev = Revision::newFromArchiveRow( $row );
} catch ( Exception $e ) {
$this->output( "Text of revision with timestamp {$row->ar_timestamp} unavailable!\n" );
return false; // bug 22624?
}
$text = $rev->getSerializedData();
if ( !is_string( $text ) ) {
# This should not happen, but sometimes does (bug 20757)
$this->output( "Data of revision with timestamp {$row->ar_timestamp} unavailable!\n" );
return false;
} else {
# Archive table as no PK, but (NS,title,time) should be near unique.
# Any duplicates on those should also have duplicated text anyway.
$db->update( 'archive',
[ 'ar_sha1' => Revision::base36Sha1( $text ) ],
[
'ar_namespace' => $row->ar_namespace,
'ar_title' => $row->ar_title,
'ar_timestamp' => $row->ar_timestamp,
'ar_len' => $row->ar_len // extra sanity
],
__METHOD__
);
return true;
}
}
}
$maintClass = "PopulateRevisionSha1";
require_once RUN_MAINTENANCE_IF_MAIN;