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<?php
/**
* Lock class.
*
* @package automattic/jetpack-sync
*/
namespace Automattic\Jetpack\Sync;
/**
* Lock class
*/
class Lock {
/**
* Prefix of the blog lock transient.
*
* @access public
*
* @var string
*/
const LOCK_PREFIX = 'jp_sync_lock_';
/**
* Default Lifetime of the lock.
* This is the expiration value as such we are setting it high to handle cases where there are
* long running requests. Short expiration value leads to concurrent requests and performance issues.
*
* @access public
*
* @var int
*/
const LOCK_TRANSIENT_EXPIRY = 180; // Seconds.
/**
* Attempt to lock.
*
* @access public
*
* @param string $name lock name.
* @param int $expiry lock duration in seconds.
*
* @return boolean True if succeeded, false otherwise.
*/
public function attempt( $name, $expiry = self::LOCK_TRANSIENT_EXPIRY ) {
$lock_name = self::LOCK_PREFIX . $name;
$locked_time = get_option( $lock_name );
if ( $locked_time ) {
// If expired update to false but don't send. Send will occurr in new request to avoid race conditions.
if ( microtime( true ) > $locked_time ) {
update_option( $lock_name, false, false );
}
return false;
}
$locked_time = microtime( true ) + $expiry;
update_option( $lock_name, $locked_time, false );
return $locked_time;
}
/**
* Remove the lock.
*
* @access public
*
* @param string $name lock name.
* @param bool|float $lock_expiration lock expiration.
*/
public function remove( $name, $lock_expiration = false ) {
$lock_name = self::LOCK_PREFIX . $name;
// Only remove lock if current value matches our lock.
if ( true === $lock_expiration || (string) get_option( $lock_name ) === (string) $lock_expiration ) {
update_option( $lock_name, false, false );
}
}
}