104 lines
3.0 KiB
PHP
104 lines
3.0 KiB
PHP
|
<?php
|
||
|
|
/**
|
||
|
|
* @link http://www.yiiframework.com/
|
||
|
|
* @copyright Copyright (c) 2008 Yii Software LLC
|
||
|
|
* @license http://www.yiiframework.com/license/
|
||
|
|
*/
|
||
|
|
|
||
|
|
namespace yii\mutex;
|
||
|
|
|
||
|
|
use yii\base\InvalidArgumentException;
|
||
|
|
use yii\base\InvalidConfigException;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* PgsqlMutex implements mutex "lock" mechanism via PgSQL locks.
|
||
|
|
*
|
||
|
|
* Application configuration example:
|
||
|
|
*
|
||
|
|
* ```
|
||
|
|
* [
|
||
|
|
* 'components' => [
|
||
|
|
* 'db' => [
|
||
|
|
* 'class' => 'yii\db\Connection',
|
||
|
|
* 'dsn' => 'pgsql:host=127.0.0.1;dbname=demo',
|
||
|
|
* ]
|
||
|
|
* 'mutex' => [
|
||
|
|
* 'class' => 'yii\mutex\PgsqlMutex',
|
||
|
|
* ],
|
||
|
|
* ],
|
||
|
|
* ]
|
||
|
|
* ```
|
||
|
|
*
|
||
|
|
* @see Mutex
|
||
|
|
*
|
||
|
|
* @author nineinchnick <janek.jan@gmail.com>
|
||
|
|
* @since 2.0.8
|
||
|
|
*/
|
||
|
|
class PgsqlMutex extends DbMutex
|
||
|
|
{
|
||
|
|
use RetryAcquireTrait;
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Initializes PgSQL specific mutex component implementation.
|
||
|
|
* @throws InvalidConfigException if [[db]] is not PgSQL connection.
|
||
|
|
*/
|
||
|
|
public function init()
|
||
|
|
{
|
||
|
|
parent::init();
|
||
|
|
if ($this->db->driverName !== 'pgsql') {
|
||
|
|
throw new InvalidConfigException('In order to use PgsqlMutex connection must be configured to use PgSQL database.');
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Converts a string into two 16 bit integer keys using the SHA1 hash function.
|
||
|
|
* @param string $name
|
||
|
|
* @return array contains two 16 bit integer keys
|
||
|
|
*/
|
||
|
|
private function getKeysFromName($name)
|
||
|
|
{
|
||
|
|
return array_values(unpack('n2', sha1($name, true)));
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Acquires lock by given name.
|
||
|
|
* @param string $name of the lock to be acquired.
|
||
|
|
* @param int $timeout time (in seconds) to wait for lock to become released.
|
||
|
|
* @return bool acquiring result.
|
||
|
|
* @see http://www.postgresql.org/docs/9.0/static/functions-admin.html
|
||
|
|
*/
|
||
|
|
protected function acquireLock($name, $timeout = 0)
|
||
|
|
{
|
||
|
|
list($key1, $key2) = $this->getKeysFromName($name);
|
||
|
|
|
||
|
|
return $this->retryAcquire($timeout, function () use ($key1, $key2) {
|
||
|
|
return $this->db->useMaster(function ($db) use ($key1, $key2) {
|
||
|
|
/** @var \yii\db\Connection $db */
|
||
|
|
return (bool) $db->createCommand(
|
||
|
|
'SELECT pg_try_advisory_lock(:key1, :key2)',
|
||
|
|
[':key1' => $key1, ':key2' => $key2]
|
||
|
|
)->queryScalar();
|
||
|
|
});
|
||
|
|
});
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Releases lock by given name.
|
||
|
|
* @param string $name of the lock to be released.
|
||
|
|
* @return bool release result.
|
||
|
|
* @see http://www.postgresql.org/docs/9.0/static/functions-admin.html
|
||
|
|
*/
|
||
|
|
protected function releaseLock($name)
|
||
|
|
{
|
||
|
|
list($key1, $key2) = $this->getKeysFromName($name);
|
||
|
|
return $this->db->useMaster(function ($db) use ($key1, $key2) {
|
||
|
|
/** @var \yii\db\Connection $db */
|
||
|
|
return (bool) $db->createCommand(
|
||
|
|
'SELECT pg_advisory_unlock(:key1, :key2)',
|
||
|
|
[':key1' => $key1, ':key2' => $key2]
|
||
|
|
)->queryScalar();
|
||
|
|
});
|
||
|
|
}
|
||
|
|
}
|