1 files changed, 96 insertions, 0 deletions
diff --git a/www/wiki/maintenance/fetchText.php b/www/wiki/maintenance/fetchText.php
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+++ b/www/wiki/maintenance/fetchText.php
@@ -0,0 +1,96 @@
+<?php
+/**
+ * Communications protocol.
+ * This is used by dumpTextPass.php when the --spawn option is present.
+ *
+ * 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';
+
+use Wikimedia\Rdbms\IDatabase;
+
+/**
+ * Maintenance script used to fetch page text in a subprocess.
+ *
+ * @ingroup Maintenance
+ */
+class FetchText extends Maintenance {
+	public function __construct() {
+		parent::__construct();
+		$this->addDescription( "Fetch the raw revision blob from an old_id.\n" .
+			"NOTE: Export transformations are NOT applied. " .
+			"This is left to backupTextPass.php"
+		);
+	}
+
+	/**
+	 * returns a string containing the following in order:
+	 *   textid
+	 *   \n
+	 *   length of text (-1 on error = failure to retrieve/unserialize/gunzip/etc)
+	 *   \n
+	 *   text  (may be empty)
+	 *
+	 * note that the text string itself is *not* followed by newline
+	 */
+	public function execute() {
+		$db = $this->getDB( DB_REPLICA );
+		$stdin = $this->getStdin();
+		while ( !feof( $stdin ) ) {
+			$line = fgets( $stdin );
+			if ( $line === false ) {
+				// We appear to have lost contact...
+				break;
+			}
+			$textId = intval( $line );
+			$text = $this->doGetText( $db, $textId );
+			if ( $text === false ) {
+				# actual error, not zero-length text
+				$textLen = "-1";
+			} else {
+				$textLen = strlen( $text );
+			}
+			$this->output( $textId . "\n" . $textLen . "\n" . $text );
+		}
+	}
+
+	/**
+	 * May throw a database error if, say, the server dies during query.
+	 * @param IDatabase $db
+	 * @param int $id The old_id
+	 * @return string
+	 */
+	private function doGetText( $db, $id ) {
+		$id = intval( $id );
+		$row = $db->selectRow( 'text',
+			[ 'old_text', 'old_flags' ],
+			[ 'old_id' => $id ],
+			__METHOD__ );
+		$text = Revision::getRevisionText( $row );
+		if ( $text === false ) {
+			return false;
+		}
+
+		return $text;
+	}
+}
+
+$maintClass = FetchText::class;
+require_once RUN_MAINTENANCE_IF_MAIN;