Split up Socket and Rcon classes to be engine specific extensions.

SourceQuery/Rcon/AbstractRcon.php

@@ -0,0 +1,28 @@
+<?php
+
+declare(strict_types=1);
+
+namespace xPaw\SourceQuery\Rcon;
+
+use xPaw\SourceQuery\Buffer;
+use xPaw\SourceQuery\Exception\AuthenticationException;
+use xPaw\SourceQuery\Exception\InvalidPacketException;
+
+abstract class AbstractRcon implements RconInterface
+{
+    /**
+     * @param int|null $header
+     * @param string $string
+     *
+     * @return bool
+     */
+    abstract protected function write(?int $header, string $string = ''): bool;
+
+    /**
+     * @throws AuthenticationException
+     * @throws InvalidPacketException
+     *
+     * @return Buffer
+     */
+    abstract protected function read(): Buffer;
+}