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<?php |
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/** |
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* @author: jiangyi |
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* @date: 下午2:55 2019/2/28 |
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*/ |
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namespace EasyRedis; |
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class Lock |
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{ |
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protected $redis; |
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public function __construct(Connection $connection) |
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{ |
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$this->redis = $connection; |
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} |
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/** |
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* 获取锁 |
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* @param string $lockName |
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* @param int|float $acquireTimeout |
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* @param int|float $lockTimeout |
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* @return bool|string |
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*/ |
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public function acquireLock(string $lockName, $acquireTimeout = 10, $lockTimeout = 10) |
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{ |
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$lockName = 'lock:' . $lockName; |
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$identifier = $this->getIdentifier(); |
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$end = time() + $acquireTimeout; |
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while (time() < $end) { |
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if ($this->redis->setnx($lockName, $identifier)) { |
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$this->redis->expire($lockName, $lockTimeout); |
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return $identifier; |
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} elseif (!$this->redis->ttl($lockName)) { |
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$this->redis->expire($lockName, $lockTimeout); |
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} |
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usleep(1000); |
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} |
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return false; |
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} |
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/** |
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* 释放锁 |
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* @param string $lockName |
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* @param string $identifier |
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* @return bool |
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*/ |
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public function releaseLock(string $lockName, string $identifier) |
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{ |
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$lockName = 'lock:' . $lockName; |
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while (true) { |
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$this->redis->watch($lockName); |
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if ($this->redis->get($lockName) == $identifier) { |
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$this->redis->multi(); |
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$this->redis->del($lockName); |
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if (!$this->redis->exec()) { |
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continue; |
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} |
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return true; |
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} |
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$this->redis->unwatch(); |
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break; |
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} |
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return false; |
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} |
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/** |
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* 获取公平信号量锁 |
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* @param $semname |
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* @param $limit |
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* @param int $timeout |
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* @return bool|string |
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*/ |
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public function acquireFairSemaphore($semname, $limit, $timeout = 10) |
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{ |
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$identifier = $this->getIdentifier(); |
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$microTime = $this->microTimeFloat(); |
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$ownerZset = $semname . ':owner'; |
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$counterStr = $semname . ':counter'; |
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// 清理过期的信号量持有者 |
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$this->redis->zremrangebyscore($semname, '-inf', $microTime + $timeout); |
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// 计数器自增 |
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$counter = $this->redis->incr($counterStr); |
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// 加入超时有序集合 |
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$this->redis->zadd($semname, $microTime, $identifier); |
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// 加入信号量拥有者 |
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$this->redis->zadd($ownerZset, $counter, $identifier); |
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// 交集 |
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$this->redis->zinterstore($ownerZset, 2, $ownerZset, $semname, 'WEIGHTS', 1, 0); |
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$rank = $this->redis->zrank($ownerZset, $identifier); |
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if ($rank < $limit) { |
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return $identifier; |
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} |
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// 获取失败，删除添加的信号量 |
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$this->redis->zrem($semname, $identifier); |
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$this->redis->zrem($ownerZset, $identifier); |
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return false; |
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} |
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/** |
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* 释放公平信号量 |
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* @param $semname |
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* @param $identifier |
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* @return bool |
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*/ |
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public function releaseFairSemaphore($semname, $identifier) |
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{ |
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$this->redis->zrem($semname, $identifier); |
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$ownerZset = $semname . ':owner'; |
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return (bool)$this->redis->zrem($ownerZset, $identifier); |
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} |
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/** |
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* 刷新信号量 |
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* @param $semname |
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* @param $identifier |
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* @return bool |
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*/ |
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public function refreshFairSemaphore($semname, $identifier) |
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{ |
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$microTime = $this->microTimeFloat(); |
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// 更新客户端持有的信号量 |
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if ($this->redis->zadd($semname, $microTime, $identifier)) { |
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// 告知调用者，客户端已经失去信号量 |
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$this->releaseFairSemaphore($semname, $identifier); |
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return false; |
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} |
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return true; |
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} |
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/** |
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* 公平信号量加锁，消除竞争条件 |
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* @param $semname |
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* @param $limit |
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* @param int $timeout |
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* @return bool|string |
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*/ |
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public function acquireSemaphoreWithLock($semname, $limit, $timeout = 10) |
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{ |
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if ($identifier = $this->acquireLock($semname, 0.01)) { |
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try { |
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return $this->acquireFairSemaphore($semname, $limit, $timeout); |
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} catch (\Exception $e) { |
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} finally { |
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$this->releaseLock($semname, $identifier); |
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} |
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} |
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return false; |
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} |
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protected function microTimeFloat() |
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{ |
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list($usec, $sec) = explode(' ', microtime()); |
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return ((float)$usec + (float)$sec); |
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} |
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protected function getIdentifier() |
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{ |
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return self::uuidV4(); |
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} |
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public static function uuidV4() |
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{ |
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return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x', |
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// 32 bits for "time_low" |
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mt_rand(0, 0xffff), mt_rand(0, 0xffff), |
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// 16 bits for "time_mid" |
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mt_rand(0, 0xffff), |
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// 16 bits for "time_hi_and_version", |
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// four most significant bits holds version number 4 |
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mt_rand(0, 0x0fff) | 0x4000, |
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// 16 bits, 8 bits for "clk_seq_hi_res", |
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// 8 bits for "clk_seq_low", |
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// two most significant bits holds zero and one for variant DCE1.1 |
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mt_rand(0, 0x3fff) | 0x8000, |
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// 48 bits for "node" |
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mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff) |
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); |
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} |
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} |
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wenjy /
php-redis
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