friendica-5847 Console Cache List command doesn't work

- filterPrefix => filterArrayKeysByPrefix()
- Logging failed Executions of getAllKeys and get from Memcached

src/Core/Cache/AbstractCacheDriver.php

@@ -44,21 +44,22 @@ abstract class AbstractCacheDriver extends BaseObject
 	}
 
 	/**
-	 * Filters a list for a given prefix
+	 * Filters the keys of an array with a given prefix
+	 * Returns the filtered keys as an new array
 	 *
-	 * @param array $list the list
-	 * @param string|null $prefix the prefix
+	 * @param array $array The array, which should get filtered
+	 * @param string|null $prefix The prefix (if null, all keys will get returned)
 	 *
-	 * @return array the filtered list
+	 * @return array The filtered array with just the keys
 	 */
-	protected function filterPrefix($list, $prefix = null)
+	protected function filterArrayKeysByPrefix($array, $prefix = null)
 	{
 		if (empty($prefix)) {
-			return array_keys($list);
+			return array_keys($array);
 		} else {
 			$result = [];
 
-			foreach (array_keys($list) as $key) {
+			foreach (array_keys($array) as $key) {
 				if (strpos($key, $prefix) === 0) {
 					array_push($result, $key);
 				}

src/Core/Cache/ArrayCache.php

@@ -24,7 +24,7 @@ class ArrayCache extends AbstractCacheDriver implements IMemoryCacheDriver
 	 */
 	public function getAllKeys($prefix = null)
 	{
-		return $this->filterPrefix($this->cachedData, $prefix);
+		return $this->filterArrayKeysByPrefix($this->cachedData, $prefix);
 	}
 
 	/**

src/Core/Cache/MemcacheCacheDriver.php

@@ -45,23 +45,23 @@ class MemcacheCacheDriver extends AbstractCacheDriver implements IMemoryCacheDri
 	 */
 	public function getAllKeys($prefix = null)
 	{
-		$list = [];
+		$keys = [];
 		$allSlabs = $this->memcache->getExtendedStats('slabs');
 		foreach ($allSlabs as $slabs) {
 			foreach (array_keys($slabs) as $slabId) {
 				$cachedump = $this->memcache->getExtendedStats('cachedump', (int)$slabId);
-				foreach ($cachedump as $keys => $arrVal) {
+				foreach ($cachedump as $key => $arrVal) {
 					if (!is_array($arrVal)) {
 						continue;
 					}
-					$list = array_merge($list, array_keys($arrVal));
+					$keys = array_merge($keys, array_keys($arrVal));
 				}
 			}
 		}
 
-		$list = $this->getOriginalKeys($list);
+		$keys = $this->getOriginalKeys($keys);
 
-		return $this->filterPrefix($list, $prefix);
+		return $this->filterArrayKeysByPrefix($keys, $prefix);
 	}
 
 	/**

src/Core/Cache/MemcachedCacheDriver.php

@@ -62,13 +62,14 @@ class MemcachedCacheDriver extends AbstractCacheDriver implements IMemoryCacheDr
 	 */
 	public function getAllKeys($prefix = null)
 	{
-		// Doesn't work because of https://github.com/php-memcached-dev/php-memcached/issues/367
-		// returns everytime an empty array
-		throw new InternalServerErrorException('getAllKeys for Memcached not supported yet');
+		$keys = $this->getOriginalKeys($this->memcached->getAllKeys());
 
-		$list = $this->getOriginalKeys($this->memcached->getAllKeys());
-
-		return $this->filterPrefix($list, $prefix);
+		if ($this->memcached->getResultCode() == Memcached::RES_SUCCESS) {
+			return $this->filterArrayKeysByPrefix($keys, $prefix);
+		} else {
+			logger('Memcached \'getAllKeys\' failed with ' . $this->memcached->getResultMessage(), LOGGER_ALL);
+			return [];
+		}
 	}
 
 	/**
@@ -76,17 +77,17 @@ class MemcachedCacheDriver extends AbstractCacheDriver implements IMemoryCacheDr
 	 */
 	public function get($key)
 	{
-		$return = null;
 		$cachekey = $this->getCacheKey($key);
 
 		// We fetch with the hostname as key to avoid problems with other applications
 		$value = $this->memcached->get($cachekey);
 
 		if ($this->memcached->getResultCode() === Memcached::RES_SUCCESS) {
-			$return = $value;
+			return $value;
+		} else {
+			logger('Memcached \'get\' failed with ' . $this->memcached->getResultMessage(), LOGGER_ALL);
+			return [];
 		}
-
-		return $return;
 	}
 
 	/**
@@ -109,7 +110,6 @@ class MemcachedCacheDriver extends AbstractCacheDriver implements IMemoryCacheDr
 				$value
 			);
 		}
-
 	}
 
 	/**

src/Core/Console/Cache.php

@@ -115,10 +115,7 @@ HELP;
 
 		$count = 0;
 		foreach ($keys as $key) {
-			if (empty($prefix) || strpos($key, $prefix) === 0) {
 			$this->out($key);
-				$count++;
-			}
 		}
 
 		$this->out($count . ' keys found');