Pagecache for frequently fetched pages

src/Protocol/ActivityPub/PageCache.php

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+<?php
+/**
+ * @copyright Copyright (C) 2010-2022, the Friendica project
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace Friendica\Protocol\ActivityPub;
+
+use Friendica\Core\Logger;
+use Friendica\Database\Database;
+use Friendica\Database\DBA;
+use Friendica\DI;
+use Friendica\Util\DateTimeFormat;
+
+/**
+ * This class handles the page cache
+ */
+class PageCache
+{
+	/**
+	 * Add content to the page cache
+	 *
+	 * @param string $page
+	 * @param mixed $content
+	 * @return void
+	 */
+	public static function add(string $page, $content)
+	{
+		if (!DI::config()->get('system', 'pagecache')) {
+			return;
+		}
+
+		DBA::delete('pagecache', ["`fetched` < ?", DateTimeFormat::utc('now - 5 minutes')]);
+		DBA::insert('pagecache', ['page' => $page, 'content' => serialize($content), 'fetched' => DateTimeFormat::utcNow()], Database::INSERT_UPDATE);
+
+		Logger::debug('Page added', ['page' => $page]);
+	}
+
+	/**
+	 * Fetch data from the page cache
+	 *
+	 * @param string $page
+	 * @return mixed
+	 */
+	public static function fetch(string $page)
+	{
+		$pagecache = DBA::selectFirst('pagecache', [], ['page' => $page]);
+		if (empty($pagecache['content'])) {
+			return null;
+		}
+
+		DBA::update('pagecache', ['fetched' => DateTimeFormat::utcNow()], ['page' => $page]);
+
+		Logger::debug('Page fetched', ['page' => $page]);
+
+		return unserialize($pagecache['content']);
+	}
+}