From c60b1d890d203cf719f62c8e8674445d9cf20554 Mon Sep 17 00:00:00 2001
From: Alexander Ebert <ebert@woltlab.com>
Date: Sun, 23 Jun 2013 20:31:40 +0200
Subject: [PATCH] Fixed wildcard clearing for memcached

---
 .../source/MemcachedCacheSource.class.php     | 32 +++++++++++++++++--
 1 file changed, 30 insertions(+), 2 deletions(-)

diff --git a/wcfsetup/install/files/lib/system/cache/source/MemcachedCacheSource.class.php b/wcfsetup/install/files/lib/system/cache/source/MemcachedCacheSource.class.php
index 540c9b04dd..3ae545ed6a 100644
--- a/wcfsetup/install/files/lib/system/cache/source/MemcachedCacheSource.class.php
+++ b/wcfsetup/install/files/lib/system/cache/source/MemcachedCacheSource.class.php
@@ -93,9 +93,12 @@ class MemcachedCacheSource implements ICacheSource {
 	 */
 	public function flush($cacheName, $useWildcard) {
 		$cacheName = $this->prefix . $cacheName;
-		$this->memcached->delete($cacheName);
 		
-		$this->updateMaster(null, $cacheName);
+		$resources = ($useWildcard) ? $this->getResources('~^' .  $cacheName. '(-[a-f0-9]+)?$~') : array($cacheName);
+		foreach ($resources as $resource) {
+			$this->memcached->delete($resource);
+			$this->updateMaster(null, $resource);
+		}
 	}
 	
 	/**
@@ -238,4 +241,29 @@ class MemcachedCacheSource implements ICacheSource {
 		// default TTL: 3 days
 		return (60 * 60 * 24 * 3);
 	}
+	
+	/**
+	 * Gets a list of resources matching given pattern.
+	 * 
+	 * @param	string		$pattern
+	 * @return	array<string>
+	 */
+	protected function getResources($pattern) {
+		$resources = array();
+		$master = $this->memcached->get($this->prefix . 'master');
+		
+		if ($master !== false) {
+			$master = @unserialize($master);
+			
+			if ($master !== false) {
+				foreach ($master as $index => $key) {
+					if (preg_match($pattern, $key)) {
+						$resources[] = $key;
+					}
+				}
+			}
+		}
+		
+		return $resources;
+	}
 }
-- 
2.20.1