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Diffstat (limited to 'maintenance/populateRevisionSha1.php')
| -rw-r--r-- | maintenance/populateRevisionSha1.php | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/maintenance/populateRevisionSha1.php b/maintenance/populateRevisionSha1.php new file mode 100644 index 00000000..55e2a93d --- /dev/null +++ b/maintenance/populateRevisionSha1.php @@ -0,0 +1,185 @@ +<?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 + * + * @ingroup Maintenance + */ + +require_once( dirname( __FILE__ ) . '/Maintenance.php' ); + +class PopulateRevisionSha1 extends LoggedUpdateMaintenance { + public function __construct() { + parent::__construct(); + $this->mDescription = "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 ); + } + + $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 $table string + * @param $idCol + * @param $prefix string + * @return Integer 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__ ); + + $db->begin(); + foreach ( $res as $row ) { + if ( $this->upgradeRow( $row, $table, $idCol, $prefix ) ) { + $count++; + } + } + $db->commit(); + + $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', '*', array( 'ar_rev_id IS NULL' ), __METHOD__ ); + + $updateSize = 0; + $db->begin(); + foreach ( $res as $row ) { + if ( $this->upgradeLegacyArchiveRow( $row ) ) { + ++$count; + } + if ( ++$updateSize >= 100 ) { + $updateSize = 0; + $db->commit(); + $this->output( "Commited row with ar_timestamp={$row->ar_timestamp}\n" ); + wfWaitForSlaves(); + $db->begin(); + } + } + $db->commit(); + return $count; + } + + /** + * @param $row + * @param $table + * @param $idCol + * @param $prefix + * @return bool + */ + protected function upgradeRow( $row, $table, $idCol, $prefix ) { + $db = $this->getDB( DB_MASTER ); + if ( $table === 'archive' ) { + $rev = Revision::newFromArchiveRow( $row ); + } else { + $rev = new Revision( $row ); + } + $text = $rev->getRawText(); + if ( !is_string( $text ) ) { + # This should not happen, but sometimes does (bug 20757) + $this->output( "Text of revision with {$idCol}={$row->$idCol} unavailable!\n" ); + return false; + } else { + $db->update( $table, + array( "{$prefix}_sha1" => Revision::base36Sha1( $text ) ), + array( $idCol => $row->$idCol ), + __METHOD__ + ); + return true; + } + } + + /** + * @param $row + * @return bool + */ + protected function upgradeLegacyArchiveRow( $row ) { + $db = $this->getDB( DB_MASTER ); + $rev = Revision::newFromArchiveRow( $row ); + $text = $rev->getRawText(); + if ( !is_string( $text ) ) { + # This should not happen, but sometimes does (bug 20757) + $this->output( "Text of revision with timestamp {$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', + array( 'ar_sha1' => Revision::base36Sha1( $text ) ), + array( + '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 ); |