Add RedisConnection class for managing Redis connections

src/FederationServer/Classes/RedisConnection.php

@@ -0,0 +1,43 @@
+<?php
+
+    namespace FederationServer\Classes;
+
+    use Redis;
+    use FederationServer\Classes\Configuration;
+    use FederationServer\Classes\Configuration\RedisConfiguration;
+
+    class RedisConnection
+    {
+        private static ?Redis $redis = null;
+
+        /**
+         * Get the Redis connection instance. If it does not exist, create it using the configuration.
+         *
+         * @return Redis|null Returns Redis instance if enabled, otherwise null.
+         * @throws \RedisException
+         */
+        public static function getConnection(): ?Redis
+        {
+            if (self::$redis === null)
+            {
+                $redisConfig = Configuration::getRedisConfiguration();
+
+                if (!$redisConfig->isEnabled())
+                {
+                    return null;
+                }
+
+                $redis = new Redis();
+                $redis->connect($redisConfig->getHost(), $redisConfig->getPort());
+                if ($redisConfig->getPassword() !== null)
+                {
+                    $redis->auth($redisConfig->getPassword());
+                }
+                $redis->select($redisConfig->getDatabase());
+
+                self::$redis = $redis;
+            }
+
+            return self::$redis;
+        }
+    }