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<?php
namespace Smush\Core\Modules\Background;
class Mutex {
const REQUIRED_MYSQL_VERSION = '5.7';
/**
* @var string
*/
private $key;
/**
* TRUE: Don't perform the operation if lock couldn't be acquired
* FALSE: Even if lock is not acquired, still perform the operation
*
* @var bool
*/
private $break_on_timeout = false;
/**
* @var int
*/
private $timeout = 10;
/**
* @var string|null
*/
private $mysql_version;
public function __construct( $key ) {
$this->key = $key;
}
public function execute( $operation ) {
if ( $this->is_supported() ) {
$acquired = $this->acquire_lock();
if ( $acquired || ! $this->break_on_timeout() ) {
call_user_func( $operation );
}
$this->release_lock();
} else {
call_user_func( $operation );
}
}
private function acquire_lock() {
global $wpdb;
$lock = $wpdb->get_row(
$wpdb->prepare(
'SELECT GET_LOCK(%s,%d) as lock_set',
array(
$this->get_key(),
$this->get_timeout(),
)
)
);
return 1 === intval( $lock->lock_set );
}
private function release_lock() {
global $wpdb;
$wpdb->get_row(
$wpdb->prepare(
'SELECT RELEASE_LOCK(%s) as lock_released',
array( $this->get_key() )
)
);
}
/**
* @return bool
*/
public function break_on_timeout() {
return $this->break_on_timeout;
}
/**
* @param bool $break_on_timeout
*/
public function set_break_on_timeout( $break_on_timeout ) {
$this->break_on_timeout = $break_on_timeout;
return $this;
}
/**
* @return int
*/
public function get_timeout() {
return $this->timeout;
}
/**
* @param int $timeout
*/
public function set_timeout( $timeout ) {
$this->timeout = $timeout;
return $this;
}
/**
* @return string
*/
public function get_key() {
return $this->key;
}
/**
* @param string $key
*/
public function set_key( $key ) {
$this->key = $key;
return $this;
}
private function is_supported() {
return $this->is_mysql_requirement_met();
}
private function get_actual_mysql_version() {
if ( ! $this->mysql_version ) {
global $wpdb;
/**
* MariaDB version prefix 5.5.5- is not stripped when using $wpdb->db_version() to get the DB version:
* https://github.com/php/php-src/issues/7972
*/
$this->mysql_version = $wpdb->get_var( 'SELECT VERSION()' );
}
return $this->mysql_version;
}
private function is_mysql_requirement_met() {
return version_compare( $this->get_actual_mysql_version(), $this->get_required_mysql_version(), '>=' );
}
private function get_required_mysql_version() {
return self::REQUIRED_MYSQL_VERSION;
}
}