Add class MD_STD_CACHE

MD_STD_CACHE.php

@@ -0,0 +1,64 @@
+<?PHP
+/**
+ * Provides static functions for simple caching.
+ *
+ * @author Joshua Ramon Enslin <joshua@museum-digital.de>
+ */
+declare(strict_types = 1);
+
+/**
+ * Provides caching functions.
+ */
+final class MD_STD_CACHE {
+
+    /** @var string */
+    public static string $redis_host = '127.0.0.1';
+    /** @var string */
+    public static int $redis_port = 6379;
+
+    /**
+     * Caches and serves a page through redis. Should be called at the start
+     * of the script generating a page.
+     *
+     * @param string  $redisKey Key to cache by in redis.
+     * @param integer $expiry   Expiration time in seconds.
+     *
+     * @return boolean
+     */
+    public static function serve_page_through_redis_cache(string $redisKey, int $expiry = 3600):bool {
+
+        $redis = new Redis();
+        $redis->connect(self::$redis_host, self::$redis_port, 1, NULL, 0, 0, ['auth' => [MD_CONF::$redis_pw]]);
+        if ($redis->ping() !== false) {
+
+            ob_start();
+
+            if (($redisResult = $redis->get($redisKey))) {
+                echo $redisResult;
+                $redis->close();
+                return true;
+            }
+            else {
+
+                register_shutdown_function(function(string $redisKey, int $expiry = 3600) :void {
+
+                    $outputT = MD_STD::minimizeHTMLString(MD_STD::ob_get_clean());
+                    echo $outputT;
+
+                    $redis = new Redis();
+                    $redis->connect(self::$redis_host, self::$redis_port, 1, NULL, 0, 0, ['auth' => [MD_CONF::$redis_pw]]);
+                    $redis->set($redisKey, $outputT);
+                    $redis->expire($redisKey, $expiry);
+                    $redis->close();
+                }, $redisKey);
+
+            }
+
+            $redis->close();
+        }
+        $redis->close();
+
+        return false;
+
+    }
+}