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<?php
namespace Illuminate\Cache;
use Illuminate\Redis\Connections\PhpRedisConnection;
use Redis;
use UnexpectedValueException;
class PhpRedisLock extends RedisLock
{
/**
* Create a new phpredis lock instance.
*
* @param \Illuminate\Redis\Connections\PhpRedisConnection $redis
* @param string $name
* @param int $seconds
* @param string|null $owner
* @return void
*/
public function __construct(PhpRedisConnection $redis, string $name, int $seconds, ?string $owner = null)
{
parent::__construct($redis, $name, $seconds, $owner);
}
/**
* {@inheritDoc}
*/
public function release()
{
return (bool) $this->redis->eval(
LuaScripts::releaseLock(),
1,
$this->name,
$this->serializedAndCompressedOwner()
);
}
/**
* Get the owner key, serialized and compressed.
*
* @return string
*/
protected function serializedAndCompressedOwner(): string
{
$client = $this->redis->client();
$owner = $client->_serialize($this->owner);
// https://github.com/phpredis/phpredis/issues/1938
if ($this->compressed()) {
if ($this->lzfCompressed()) {
$owner = \lzf_compress($owner);
} elseif ($this->zstdCompressed()) {
$owner = \zstd_compress($owner, $client->getOption(Redis::OPT_COMPRESSION_LEVEL));
} elseif ($this->lz4Compressed()) {
$owner = \lz4_compress($owner, $client->getOption(Redis::OPT_COMPRESSION_LEVEL));
} else {
throw new UnexpectedValueException(sprintf(
'Unknown phpredis compression in use [%d]. Unable to release lock.',
$client->getOption(Redis::OPT_COMPRESSION)
));
}
}
return $owner;
}
/**
* Determine if compression is enabled.
*
* @return bool
*/
protected function compressed(): bool
{
return $this->redis->client()->getOption(Redis::OPT_COMPRESSION) !== Redis::COMPRESSION_NONE;
}
/**
* Determine if LZF compression is enabled.
*
* @return bool
*/
protected function lzfCompressed(): bool
{
return defined('Redis::COMPRESSION_LZF') &&
$this->redis->client()->getOption(Redis::OPT_COMPRESSION) === Redis::COMPRESSION_LZF;
}
/**
* Determine if ZSTD compression is enabled.
*
* @return bool
*/
protected function zstdCompressed(): bool
{
return defined('Redis::COMPRESSION_ZSTD') &&
$this->redis->client()->getOption(Redis::OPT_COMPRESSION) === Redis::COMPRESSION_ZSTD;
}
/**
* Determine if LZ4 compression is enabled.
*
* @return bool
*/
protected function lz4Compressed(): bool
{
return defined('Redis::COMPRESSION_LZ4') &&
$this->redis->client()->getOption(Redis::OPT_COMPRESSION) === Redis::COMPRESSION_LZ4;
}
}