friendica-github/src/Core/Cache/DatabaseCacheDriver.php

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<?php
namespace Friendica\Core\Cache;
use dba;
use Friendica\Core\Cache;
use Friendica\Database\DBM;
use Friendica\Util\DateTimeFormat;
/**
* Database Cache Driver
*
* @author Hypolite Petovan <mrpetovan@gmail.com>
*/
class DatabaseCacheDriver implements ICacheDriver
{
public function get($key)
{
$cache = dba::selectFirst('cache', ['v'], ['`k` = ? AND `expires` >= ?', $key, DateTimeFormat::utcNow()]);
if (DBM::is_result($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 $value;
}
}
return null;
}
public function set($key, $value, $duration = Cache::MONTH)
{
$fields = [
'v' => serialize($value),
'expires' => DateTimeFormat::utc('now + ' . $duration . ' seconds'),
'updated' => DateTimeFormat::utcNow()
];
return dba::update('cache', $fields, ['k' => $key], true);
}
public function delete($key)
{
return dba::delete('cache', ['k' => $key]);
}
public function clear()
{
return dba::delete('cache', ['`expires` < NOW()']);
}
}