friendica-github/src/Core/Cache/DatabaseCache.php
2020-02-09 15:45:36 +01:00

138 lines
3.1 KiB
PHP

<?php
/**
* @copyright Copyright (C) 2020, Friendica
*
* @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\Core\Cache;
use Friendica\Database\Database;
use Friendica\Util\DateTimeFormat;
use Friendica\Core\BaseCache;
/**
* Database Cache
*/
class DatabaseCache extends BaseCache 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, $ttl = Duration::FIVE_MINUTES)
{
if ($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 ']);
}
}
/**
* {@inheritDoc}
*/
public function getName()
{
return Type::DATABASE;
}
}