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<?php |
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/** |
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* This file is part of ninja-mutex. |
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* |
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* (C) Kamil Dziedzic <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace NinjaMutex\Lock; |
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use PDO; |
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/** |
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* Lock implementor using MySql |
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* |
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* @author Kamil Dziedzic <[email protected]> |
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*/ |
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class MySqlLock extends LockAbstract |
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{ |
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/** |
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* MySql connections |
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* |
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* @var PDO[] |
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*/ |
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protected $pdo = array(); |
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protected $user; |
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protected $password; |
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protected $host; |
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protected $port; |
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protected $classname; |
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protected $ssl_ca_cert; |
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/** |
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* Provide data for PDO connection |
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* |
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* @param string $user |
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* @param string $password |
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* @param string $host |
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* @param int $port |
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* @param string $classname class name to create as PDO connection |
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* @param string $ssl_ca_cert Path to a file containing the SSL CA certificate(s), if you'd like to connect using SSL |
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*/ |
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public function __construct($user, $password, $host, $port = 3306, $classname = 'PDO', $ssl_ca_cert = NULL) |
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{ |
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parent::__construct(); |
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$this->user = $user; |
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$this->password = $password; |
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$this->host = $host; |
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$this->port = $port; |
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$this->classname = $classname; |
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$this->ssl_ca_cert = $ssl_ca_cert; |
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} |
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public function __clone() |
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{ |
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parent::__clone(); |
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$this->pdo = array(); |
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} |
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/** |
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* Acquire lock |
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* |
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* @param string $name name of lock |
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* @param null|int $timeout 1. null if you want blocking lock |
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* 2. 0 if you want just lock and go |
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* 3. $timeout > 0 if you want to wait for lock some time (in milliseconds) |
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* @return bool |
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*/ |
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public function acquireLock($name, $timeout = null) |
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{ |
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if (!$this->setupPDO($name)) { |
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return false; |
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} |
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return parent::acquireLock($name, $timeout); |
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} |
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/** |
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* @param string $name |
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* @param bool $blocking |
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* @return bool |
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*/ |
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protected function getLock($name, $blocking) |
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{ |
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return !$this->isLocked($name) && $this->pdo[$name]->query( |
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sprintf( |
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'SELECT GET_LOCK("%s", %d)', |
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$name, |
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0 |
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), |
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PDO::FETCH_COLUMN, |
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0 |
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)->fetch(); |
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} |
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/** |
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* Release lock |
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* |
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* @param string $name name of lock |
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* @return bool |
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*/ |
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public function releaseLock($name) |
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{ |
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if (!$this->setupPDO($name)) { |
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return false; |
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} |
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$released = (bool) $this->pdo[$name]->query( |
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sprintf( |
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'SELECT RELEASE_LOCK("%s")', |
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$name |
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), |
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PDO::FETCH_COLUMN, |
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0 |
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)->fetch(); |
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if (!$released) { |
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return false; |
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} |
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unset($this->pdo[$name]); |
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unset($this->locks[$name]); |
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return true; |
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} |
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/** |
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* Check if lock is locked |
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* |
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* @param string $name name of lock |
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* @return bool |
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*/ |
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public function isLocked($name) |
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{ |
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if (empty($this->pdo) && !$this->setupPDO($name)) { |
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return false; |
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} |
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return !current($this->pdo)->query( |
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sprintf( |
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'SELECT IS_FREE_LOCK("%s")', |
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$name |
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), |
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PDO::FETCH_COLUMN, |
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0 |
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)->fetch(); |
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} |
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/** |
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* @param string $name |
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* @return bool |
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*/ |
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protected function setupPDO($name) |
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{ |
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if (isset($this->pdo[$name])) { |
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return true; |
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} |
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$dsn = sprintf('mysql:host=%s;port=%d', $this->host, $this->port); |
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$opts = array(); |
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if (!empty($this->ssl_ca_cert)) { |
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if (file_exists($this->ssl_ca_cert)) { |
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$opts[\PDO::MYSQL_ATTR_SSL_CA] = $this->ssl_ca_cert; |
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} else { |
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error_log("Warning: specified SSL CA Certificate file doesn't exist."); |
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} |
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} |
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$this->pdo[$name] = new $this->classname($dsn, $this->user, $this->password, $opts); |
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return true; |
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} |
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public function __destruct() |
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{ |
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parent::__destruct(); |
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foreach($this->pdo as $name => $pdo) { |
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unset($this->pdo[$name]); |
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} |
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} |
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} |
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arvenil /
ninja-mutex
