Add Redis auth support

Author: oraoto

README.md

@@ -66,6 +66,7 @@ Change the Redis options (the example shows the defaults):
     [
         'host' => '127.0.0.1',
         'port' => 6379,
+        'password' => null,
         'timeout' => 0.1, // in seconds
         'read_timeout' => 10, // in seconds
         'persistent_connections' => false

src/Prometheus/Storage/Redis.php

@@ -38,6 +38,9 @@ public function __construct(array $options = array())
         if (!isset(self::$defaultOptions['persistent_connections'])) {
             self::$defaultOptions['persistent_connections'] = false;
         }
+        if (!isset(self::$defaultOptions['password'])) {
+            self::$defaultOptions['password'] = null;
+        }
 
         $this->options = array_merge(self::$defaultOptions, $options);
         $this->redis = new \Redis();
@@ -91,6 +94,9 @@ private function openConnection()
             } else {
                 @$this->redis->connect($this->options['host'], $this->options['port'], $this->options['timeout']);
             }
+            if ($this->options['password']) {
+                $this->redis->auth($this->options['password']);
+            }
             $this->redis->setOption(\Redis::OPT_READ_TIMEOUT, $this->options['read_timeout']);
         } catch (\RedisException $e) {
             throw new StorageException("Can't connect to Redis server", 0, $e);