From fea503b8e14587835ae6da1611cb92be62bc4e51 Mon Sep 17 00:00:00 2001
From: Ilmari Karonen <vyznev@users.mediawiki.org>
Date: Wed, 3 Mar 2010 20:23:42 +0000
Subject: [PATCH] (bug 18881) add maintenance script to populate rev_len field
 for old revisions

---
 maintenance/populateRevisionLength.php | 92 ++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 maintenance/populateRevisionLength.php

diff --git a/maintenance/populateRevisionLength.php b/maintenance/populateRevisionLength.php
new file mode 100644
index 0000000000..b0c1d04e3a
--- /dev/null
+++ b/maintenance/populateRevisionLength.php
@@ -0,0 +1,92 @@
+<?php
+/*
+ * Makes the required database updates for rev_len
+ * to be of any use. It can be used for some simple tracking
+ * and to find new page edits by users.
+ *
+ * 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 PopulateRevisionLength extends Maintenance {
+	public function __construct() {
+		parent::__construct();
+		$this->mDescription = "Populates rev_len";
+		$this->setBatchSize( 200 );
+	}
+
+	public function execute() {
+		$db = wfGetDB( DB_MASTER );
+		if ( !$db->tableExists( 'revision' ) ) {
+			$this->error( "revision table does not exist", true );
+		}
+		$this->output( "Populating rev_len column\n" );
+		$start = $db->selectField( 'revision', 'MIN(rev_id)', false, __FUNCTION__ );
+		$end = $db->selectField( 'revision', 'MAX(rev_id)', false, __FUNCTION__ );
+		if( is_null( $start ) || is_null( $end ) ){
+			$this->output( "...revision table seems to be empty.\n" );
+			$db->insert( 'updatelog',
+				array( 'ul_key' => 'populate rev_len' ),
+				__METHOD__,
+				'IGNORE' );
+			return;
+		}
+		# Do remaining chunks
+		$blockStart = intval( $start );
+		$blockEnd = intval( $start ) + $this->mBatchSize - 1;
+		$count = 0;
+		while( $blockStart <= $end ) {
+			$this->output( "...doing rev_id from $blockStart to $blockEnd\n" );
+			$res = $db->select( 'revision',
+					    Revision::selectFields(),
+					    array( "rev_id >= $blockStart",
+						   "rev_id <= $blockEnd",
+						   "rev_len IS NULL" ),
+					    __METHOD__ );
+			# Go through and update rev_len from these rows.
+			foreach( $res as $row ) {
+				$rev = new Revision( $row );
+				$text = $rev->getRawText();
+				# Update the row...
+				$db->update( 'revision',
+					     array( 'rev_len' => strlen( $text ) ),
+					     array( 'rev_id' => $row->rev_id ),
+					     __METHOD__ );
+				$count++;
+			}
+			$blockStart += $this->mBatchSize;
+			$blockEnd += $this->mBatchSize;
+			wfWaitForSlaves( 5 );
+		}
+		$logged = $db->insert( 'updatelog',
+			array( 'ul_key' => 'populate rev_len' ),
+			__METHOD__,
+			'IGNORE' );
+		if( $logged ) {
+			$this->output( "rev_len population complete ... {$count} rows changed\n" );
+			return true;
+		} else {
+			$this->output( "Could not insert rev_len population row.\n" );
+			return false;
+		}
+	}
+}
+
+$maintClass = "PopulateRevisionLength";
+require_once( DO_MAINTENANCE );
-- 
2.20.1