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<?php
/**
* Convert history stubs that point to an external row to direct external
* pointers.
*
* 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 ExternalStorage
*/
if ( !defined( 'MEDIAWIKI' ) ) {
$optionsWithArgs = array( 'm' );
require_once __DIR__ . '/../commandLine.inc';
resolveStubs();
}
/**
* Convert history stubs that point to an external row to direct
* external pointers
*/
function resolveStubs() {
$fname = 'resolveStubs';
$dbr = wfGetDB( DB_SLAVE );
$maxID = $dbr->selectField( 'text', 'MAX(old_id)', false, $fname );
$blockSize = 10000;
$numBlocks = intval( $maxID / $blockSize ) + 1;
for ( $b = 0; $b < $numBlocks; $b++ ) {
wfWaitForSlaves();
printf( "%5.2f%%\n", $b / $numBlocks * 100 );
$start = intval( $maxID / $numBlocks ) * $b + 1;
$end = intval( $maxID / $numBlocks ) * ( $b + 1 );
$res = $dbr->select( 'text', array( 'old_id', 'old_text', 'old_flags' ),
"old_id>=$start AND old_id<=$end " .
"AND old_flags LIKE '%object%' AND old_flags NOT LIKE '%external%' " .
'AND LOWER(CONVERT(LEFT(old_text,22) USING latin1)) = \'o:15:"historyblobstub"\'',
$fname );
foreach ( $res as $row ) {
resolveStub( $row->old_id, $row->old_text, $row->old_flags );
}
}
print "100%\n";
}
/**
* Resolve a history stub
* @param int $id
* @param string $stubText
* @param string $flags
*/
function resolveStub( $id, $stubText, $flags ) {
$fname = 'resolveStub';
$stub = unserialize( $stubText );
$flags = explode( ',', $flags );
$dbr = wfGetDB( DB_SLAVE );
$dbw = wfGetDB( DB_MASTER );
if ( strtolower( get_class( $stub ) ) !== 'historyblobstub' ) {
print "Error found object of class " . get_class( $stub ) . ", expecting historyblobstub\n";
return;
}
# Get the (maybe) external row
$externalRow = $dbr->selectRow(
'text',
array( 'old_text' ),
array(
'old_id' => $stub->mOldId,
'old_flags' . $dbr->buildLike( $dbr->anyString(), 'external', $dbr->anyString() )
),
$fname
);
if ( !$externalRow ) {
# Object wasn't external
return;
}
# Preserve the legacy encoding flag, but switch from object to external
if ( in_array( 'utf-8', $flags ) ) {
$newFlags = 'external,utf-8';
} else {
$newFlags = 'external';
}
# Update the row
# print "oldid=$id\n";
$dbw->update( 'text',
array( /* SET */
'old_flags' => $newFlags,
'old_text' => $externalRow->old_text . '/' . $stub->mHash
),
array( /* WHERE */
'old_id' => $id
), $fname
);
}
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