Support for APCu caching

.travis.yml

@@ -21,4 +21,5 @@ before_script:
  - mysql -utravis test < database.sql
  - echo "extension=redis.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
  - echo "extension=memcached.so" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
+ - echo "apc.enable_cli = 1" >> ~/.phpenv/versions/$(phpenv version-name)/etc/php.ini
 after_success: bash <(curl -s https://codecov.io/bash)

src/Core/Cache/APCuCache.php

@@ -0,0 +1,154 @@
+<?php
+
+namespace Friendica\Core\Cache;
+
+use Exception;
+use Friendica\Core\Cache;
+
+/**
+ * APCu Cache Driver.
+ *
+ * @author Philipp Holzer <admin@philipp.info>
+ */
+class APCuCache extends AbstractCacheDriver implements IMemoryCacheDriver
+{
+	use TraitCompareSet;
+	use TraitCompareDelete;
+
+	/**
+	 * @throws Exception
+	 */
+	public function __construct()
+	{
+		if (!self::isAvailable()) {
+			throw new Exception('APCu is not available.');
+		}
+	}
+
+	/**
+	 * (@inheritdoc)
+	 */
+	public function getAllKeys($prefix = null)
+	{
+		$ns = $this->getCacheKey($prefix);
+		$ns = preg_quote($ns, '/');
+
+		if (class_exists('\APCIterator')) {
+			$iterator = new \APCIterator('user', '/^' . $ns. '/', APC_ITER_KEY);
+		} else {
+			$iterator = new \APCUIterator('/^' . $ns . '/', APC_ITER_KEY);
+		}
+
+		$keys = [];
+		foreach ($iterator as $item) {
+			array_push($keys, $item['key']);
+		}
+
+		return $this->getOriginalKeys($keys);
+	}
+
+	/**
+	 * (@inheritdoc)
+	 */
+	public function get($key)
+	{
+		$return = null;
+		$cachekey = $this->getCacheKey($key);
+
+		$cached = apcu_fetch($cachekey, $success);
+		if (!$success) {
+			return null;
+		}
+
+		$value = unserialize($cached);
+
+		// Only return a value if the serialized value is valid.
+		// We also check if the db entry is a serialized
+		// boolean 'false' value (which we want to return).
+		if ($cached === serialize(false) || $value !== false) {
+			$return = $value;
+		}
+
+		return $return;
+	}
+
+	/**
+	 * (@inheritdoc)
+	 */
+	public function set($key, $value, $ttl = Cache::FIVE_MINUTES)
+	{
+		$cachekey = $this->getCacheKey($key);
+
+		$cached = serialize($value);
+
+		if ($ttl > 0) {
+			return apcu_store(
+				$cachekey,
+				$cached,
+				$ttl
+			);
+		} else {
+			return apcu_store(
+				$cachekey,
+				$cached
+			);
+		}
+	}
+
+	/**
+	 * (@inheritdoc)
+	 */
+	public function delete($key)
+	{
+		$cachekey = $this->getCacheKey($key);
+		return apcu_delete($cachekey);
+	}
+
+	/**
+	 * (@inheritdoc)
+	 */
+	public function clear($outdated = true)
+	{
+		if ($outdated) {
+			return true;
+		} else {
+			$prefix = $this->getPrefix();
+			$prefix = preg_quote($prefix, '/');
+
+			if (class_exists('\APCIterator')) {
+				$iterator = new \APCIterator('user', '/^' . $prefix . '/', APC_ITER_KEY);
+			} else {
+				$iterator = new \APCUIterator('/^' . $prefix . '/', APC_ITER_KEY);
+			}
+
+			return apcu_delete($iterator);
+		}
+	}
+
+	/**
+	 * (@inheritdoc)
+	 */
+	public function add($key, $value, $ttl = Cache::FIVE_MINUTES)
+	{
+		$cachekey = $this->getCacheKey($key);
+		$cached = serialize($value);
+
+		return apcu_add($cachekey, $cached);
+	}
+
+	public static function isAvailable()
+	{
+		if (!extension_loaded('apcu')) {
+			return false;
+		} elseif (!ini_get('apc.enabled') && !ini_get('apc.enable_cli')) {
+			return false;
+		} elseif (
+			version_compare(phpversion('apc') ?: '0.0.0', '4.0.6') === -1 &&
+			version_compare(phpversion('apcu') ?: '0.0.0', '5.1.0') === -1
+		) {
+			return false;
+		}
+
+		return true;
+	}
+}

src/Core/Cache/AbstractCacheDriver.php

@@ -13,6 +13,18 @@ use Friendica\BaseObject;
  */
 abstract class AbstractCacheDriver extends BaseObject
 {
+	/**
+	 * Returns the prefix (to avoid namespace conflicts)
+	 *
+	 * @return string
+	 * @throws \Exception
+	 */
+	protected function getPrefix()
+	{
+		// We fetch with the hostname as key to avoid problems with other applications
+		return self::getApp()->getHostName();
+	}
+
 	/**
 	 * @param string $key The original key
 	 * @return string        The cache key used for the cache
@@ -20,8 +32,7 @@ abstract class AbstractCacheDriver extends BaseObject
 	 */
 	protected function getCacheKey($key)
 	{
-		// We fetch with the hostname as key to avoid problems with other applications
-		return self::getApp()->getHostName() . ":" . $key;
+		return  $this->getPrefix() . ":" . $key;
 	}
 
 	/**

src/Factory/CacheDriverFactory.php

@@ -45,6 +45,11 @@ class CacheDriverFactory
 
 				return new Cache\RedisCacheDriver($redis_host, $redis_port, $redis_db, $redis_pw);
 				break;
+
+			case 'apcu':
+				return new Cache\APCuCache();
+				break;
+
 			default:
 				return new Cache\DatabaseCacheDriver();
 		}

tests/src/Core/Cache/APCuCacheDriverTest.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace Friendica\Test\src\Core\Cache;
+
+use Friendica\Core\Cache\APCuCache;
+
+class APCuCacheDriverTest extends MemoryCacheTest
+{
+	protected function setUp()
+	{
+		if (!APCuCache::isAvailable()) {
+			$this->markTestSkipped('APCu is not available');
+		}
+
+		parent::setUp();
+	}
+
+	protected function getInstance()
+	{
+		$this->cache = new APCuCache();
+		return $this->cache;
+	}
+
+	public function tearDown()
+	{
+		$this->cache->clear(false);
+		parent::tearDown();
+	}
+}

tests/src/Core/Lock/APCuCacheLockDriverTest.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Friendica\Test\src\Core\Lock;
+
+
+use Friendica\Core\Cache\APCuCache;
+use Friendica\Core\Lock\CacheLockDriver;
+
+class APCuCacheLockDriverTest extends LockTest
+{
+	protected function getInstance()
+	{
+		return new CacheLockDriver(new APCuCache());
+	}
+}