driver: break up cache drivers

inc/Data/Driver/RedisCacheDriver.php

@@ -0,0 +1,48 @@
+<?php
+namespace Vichan\Data\Driver;
+
+defined('TINYBOARD') or exit;
+
+
+class RedisCacheDriver implements CacheDriver {
+	private string $prefix;
+	private \Redis $inner;
+
+	public function __construct(string $prefix, string $host, int $port, ?string $password, string $database) {
+		$this->inner = new \Redis();
+		$this->inner->connect($host, $port);
+		if ($password) {
+			$this->inner->auth($password);
+		}
+		if (!$this->inner->select($database)) {
+			throw new \RuntimeException('Unable to connect to Redis!');
+		}
+
+		$$this->prefix = $prefix;
+	}
+
+	public function get(string $key): mixed {
+		$ret = $this->inner->get($this->prefix . $key);
+		if ($ret === false) {
+			return null;
+		}
+		return \json_decode($ret, true);
+	}
+
+	public function set(string $key, mixed $value, mixed $expires = false): void {
+		if ($expires === false) {
+			$this->inner->set($this->prefix . $key, \json_encode($value));
+		} else {
+			$expires = $expires * 1000; // Seconds to milliseconds.
+			$this->inner->setex($this->prefix . $key, $expires, \json_encode($value));
+		}
+	}
+
+	public function delete(string $key): void {
+		$this->inner->del($this->prefix . $key);
+	}
+
+	public function flush(): void {
+		$this->inner->flushDB();
+	}
+}