Rename *CacheDriver to *Cache because they don't act as driver anymore

src/Core/Cache/DatabaseCache.php

@@ -0,0 +1,113 @@
+<?php
+
+namespace Friendica\Core\Cache;
+
+use Friendica\Core\Cache;
+use Friendica\Database\Database;
+use Friendica\Util\DateTimeFormat;
+
+/**
+ * Database Cache
+ *
+ * @author Hypolite Petovan <hypolite@mrpetovan.com>
+ */
+class DatabaseCache extends AbstractCache implements ICache
+{
+	/**
+	 * @var Database
+	 */
+	private $dba;
+
+	public function __construct(string $hostname, Database $dba)
+	{
+		parent::__construct($hostname);
+
+		$this->dba = $dba;
+	}
+
+	/**
+	 * (@inheritdoc)
+	 */
+	public function getAllKeys($prefix = null)
+	{
+		if (empty($prefix)) {
+			$where = ['`expires` >= ?', DateTimeFormat::utcNow()];
+		} else {
+			$where = ['`expires` >= ? AND `k` LIKE CONCAT(?, \'%\')', DateTimeFormat::utcNow(), $prefix];
+		}
+
+		$stmt = $this->dba->select('cache', ['k'], $where);
+
+		$keys = [];
+		while ($key = $this->dba->fetch($stmt)) {
+			array_push($keys, $key['k']);
+		}
+		$this->dba->close($stmt);
+
+		return $keys;
+	}
+
+	/**
+	 * (@inheritdoc)
+	 */
+	public function get($key)
+	{
+		$cache = $this->dba->selectFirst('cache', ['v'], ['`k` = ? AND (`expires` >= ? OR `expires` = -1)', $key, DateTimeFormat::utcNow()]);
+
+		if ($this->dba->isResult($cache)) {
+			$cached = $cache['v'];
+			$value = @unserialize($cached);
+
+			// Only return a value if the serialized value is valid.
+			// We also check if the db entry is a serialized
+			// boolean 'false' value (which we want to return).
+			if ($cached === serialize(false) || $value !== false) {
+				return $value;
+			}
+		}
+
+		return null;
+	}
+
+	/**
+	 * (@inheritdoc)
+	 */
+	public function set($key, $value, $ttl = Cache::FIVE_MINUTES)
+	{
+		if ($ttl > 0) {
+			$fields = [
+				'v' => serialize($value),
+				'expires' => DateTimeFormat::utc('now + ' . $ttl . 'seconds'),
+				'updated' => DateTimeFormat::utcNow()
+			];
+		} else {
+			$fields = [
+				'v' => serialize($value),
+				'expires' => -1,
+				'updated' => DateTimeFormat::utcNow()
+			];
+		}
+
+		return $this->dba->update('cache', $fields, ['k' => $key], true);
+	}
+
+	/**
+	 * (@inheritdoc)
+	 */
+	public function delete($key)
+	{
+		return $this->dba->delete('cache', ['k' => $key]);
+	}
+
+	/**
+	 * (@inheritdoc)
+	 */
+	public function clear($outdated = true)
+	{
+		if ($outdated) {
+			return $this->dba->delete('cache', ['`expires` < NOW()']);
+		} else {
+			return $this->dba->delete('cache', ['`k` IS NOT NULL ']);
+		}
+	}
+}