Improve redis configuration

- basic authentication
- switch database (0 - 15)

src/Core/Cache/RedisCacheDriver.php

@@ -20,11 +20,13 @@ class RedisCacheDriver extends AbstractCacheDriver implements IMemoryCacheDriver
 	private $redis;
 
 	/**
-	 * @param string $redis_host
-	 * @param int    $redis_port
+	 * @param string  $redis_host
+	 * @param int     $redis_port
+	 * @param int     $redis_db (Default = 0, maximum is 15)
+	 * @param string? $redis_pw
 	 * @throws Exception
 	 */
-	public function __construct($redis_host, $redis_port)
+	public function __construct($redis_host, $redis_port, $redis_db = 0, $redis_pw = null)
 	{
 		if (!class_exists('Redis', false)) {
 			throw new Exception('Redis class isn\'t available');
@@ -35,6 +37,14 @@ class RedisCacheDriver extends AbstractCacheDriver implements IMemoryCacheDriver
 		if (!$this->redis->connect($redis_host, $redis_port)) {
 			throw new Exception('Expected Redis server at ' . $redis_host . ':' . $redis_port . ' isn\'t available');
 		}
+
+		if (isset($redis_pw) && !$this->redis->auth($redis_pw)) {
+			throw new Exception('Cannot authenticate redis server at ' . $redis_host . ':' . $redis_port);
+		}
+
+		if ($redis_db !== 0 && !$this->redis->select($redis_db)) {
+			throw new Exception('Cannot switch to redis db ' . $redis_db . ' at ' . $redis_host . ':' . $redis_port);
+		}
 	}
 
 	/**

src/Factory/CacheDriverFactory.php

@@ -2,9 +2,9 @@
 
 namespace Friendica\Factory;
 
+use Friendica\Core\Cache;
 use Friendica\Core\Cache\ICacheDriver;
 use Friendica\Core\Config;
-use Friendica\Core\Cache;
 
 /**
  * Class CacheDriverFactory
@@ -40,8 +40,10 @@ class CacheDriverFactory
 			case 'redis':
 				$redis_host = Config::get('system', 'redis_host');
 				$redis_port = Config::get('system', 'redis_port');
+				$redis_pw   = Config::get('system', 'redis_password');
+				$redis_db   = Config::get('system', 'redis_db', 0);
 
-				return new Cache\RedisCacheDriver($redis_host, $redis_port);
+				return new Cache\RedisCacheDriver($redis_host, $redis_port, $redis_db, $redis_pw);
 				break;
 			default:
 				return new Cache\DatabaseCacheDriver();

tests/src/Core/Cache/RedisCacheDriverTest.php

@@ -22,6 +22,16 @@ class RedisCacheDriverTest extends MemoryCacheTest
 			->with('system', 'redis_port')
 			->andReturn(null);
 
+		$this->configMock
+			->shouldReceive('get')
+			->with('system', 'redis_db')
+			->andReturn(3);
+
+		$this->configMock
+			->shouldReceive('get')
+			->with('system', 'redis_password')
+			->andReturn(null);
+
 		$this->cache = CacheDriverFactory::create('redis');
 		return $this->cache;
 	}