1 files changed, 120 insertions, 0 deletions
diff --git a/www/wiki/includes/libs/objectcache/APCBagOStuff.php b/www/wiki/includes/libs/objectcache/APCBagOStuff.php
new file mode 100644
index 00000000..e41c3a25
--- /dev/null
+++ b/www/wiki/includes/libs/objectcache/APCBagOStuff.php
@@ -0,0 +1,120 @@
+<?php
+/**
+ * Object caching using PHP's APC accelerator.
+ *
+ * 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 Cache
+ */
+
+/**
+ * This is a wrapper for APC's shared memory functions
+ *
+ * @ingroup Cache
+ */
+class APCBagOStuff extends BagOStuff {
+
+	/**
+	 * @var bool If true, trust the APC implementation to serialize and
+	 * deserialize objects correctly. If false, (de-)serialize in PHP.
+	 */
+	protected $nativeSerialize;
+
+	/**
+	 * @var string String to append to each APC key. This may be changed
+	 *  whenever the handling of values is changed, to prevent existing code
+	 *  from encountering older values which it cannot handle.
+	 */
+	const KEY_SUFFIX = ':2';
+
+	/**
+	 * Available parameters are:
+	 *   - nativeSerialize:     If true, pass objects to apc_store(), and trust it
+	 *                          to serialize them correctly. If false, serialize
+	 *                          all values in PHP.
+	 *
+	 * @param array $params
+	 */
+	public function __construct( array $params = [] ) {
+		parent::__construct( $params );
+
+		if ( isset( $params['nativeSerialize'] ) ) {
+			$this->nativeSerialize = $params['nativeSerialize'];
+		} elseif ( extension_loaded( 'apcu' ) && ini_get( 'apc.serializer' ) === 'default' ) {
+			// APCu has a memory corruption bug when the serializer is set to 'default'.
+			// See T120267, and upstream bug reports:
+			//  - https://github.com/krakjoe/apcu/issues/38
+			//  - https://github.com/krakjoe/apcu/issues/35
+			//  - https://github.com/krakjoe/apcu/issues/111
+			$this->logger->warning(
+				'The APCu extension is loaded and the apc.serializer INI setting ' .
+				'is set to "default". This can cause memory corruption! ' .
+				'You should change apc.serializer to "php" instead. ' .
+				'See <https://github.com/krakjoe/apcu/issues/38>.'
+			);
+			$this->nativeSerialize = false;
+		} else {
+			$this->nativeSerialize = true;
+		}
+	}
+
+	protected function doGet( $key, $flags = 0 ) {
+		return $this->getUnserialize(
+			apc_fetch( $key . self::KEY_SUFFIX )
+		);
+	}
+
+	protected function getUnserialize( $value ) {
+		if ( is_string( $value ) && !$this->nativeSerialize ) {
+			$value = $this->isInteger( $value )
+				? intval( $value )
+				: unserialize( $value );
+		}
+		return $value;
+	}
+
+	public function set( $key, $value, $exptime = 0, $flags = 0 ) {
+		apc_store(
+			$key . self::KEY_SUFFIX,
+			$this->setSerialize( $value ),
+			$exptime
+		);
+
+		return true;
+	}
+
+	protected function setSerialize( $value ) {
+		if ( !$this->nativeSerialize && !$this->isInteger( $value ) ) {
+			$value = serialize( $value );
+		}
+		return $value;
+	}
+
+	public function delete( $key ) {
+		apc_delete( $key . self::KEY_SUFFIX );
+
+		return true;
+	}
+
+	public function incr( $key, $value = 1 ) {
+		return apc_inc( $key . self::KEY_SUFFIX, $value );
+	}
+
+	public function decr( $key, $value = 1 ) {
+		return apc_dec( $key . self::KEY_SUFFIX, $value );
+	}
+}