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<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\VarDumper\Caster;

use Symfony\Component\VarDumper\Cloner\Stub;

/**
 * Casts Redis class from ext-redis to array representation.
 *
 * @author Nicolas Grekas <p@tchwork.com>
 *
 * @final
 */
class RedisCaster
{
    private const SERIALIZERS = [
        \Redis::SERIALIZER_NONE => 'NONE',
        \Redis::SERIALIZER_PHP => 'PHP',
        2 => 'IGBINARY', // Optional Redis::SERIALIZER_IGBINARY
    ];

    private const MODES = [
        \Redis::ATOMIC => 'ATOMIC',
        \Redis::MULTI => 'MULTI',
        \Redis::PIPELINE => 'PIPELINE',
    ];

    private const COMPRESSION_MODES = [
        0 => 'NONE', // Redis::COMPRESSION_NONE
        1 => 'LZF',  // Redis::COMPRESSION_LZF
    ];

    private const FAILOVER_OPTIONS = [
        \RedisCluster::FAILOVER_NONE => 'NONE',
        \RedisCluster::FAILOVER_ERROR => 'ERROR',
        \RedisCluster::FAILOVER_DISTRIBUTE => 'DISTRIBUTE',
        \RedisCluster::FAILOVER_DISTRIBUTE_SLAVES => 'DISTRIBUTE_SLAVES',
    ];

    public static function castRedis(\Redis $c, array $a, Stub $stub, bool $isNested)
    {
        $prefix = Caster::PREFIX_VIRTUAL;

        if (!$connected = $c->isConnected()) {
            return $a + [
                $prefix.'isConnected' => $connected,
            ];
        }

        $mode = $c->getMode();

        return $a + [
            $prefix.'isConnected' => $connected,
            $prefix.'host' => $c->getHost(),
            $prefix.'port' => $c->getPort(),
            $prefix.'auth' => $c->getAuth(),
            $prefix.'mode' => isset(self::MODES[$mode]) ? new ConstStub(self::MODES[$mode], $mode) : $mode,
            $prefix.'dbNum' => $c->getDbNum(),
            $prefix.'timeout' => $c->getTimeout(),
            $prefix.'lastError' => $c->getLastError(),
            $prefix.'persistentId' => $c->getPersistentID(),
            $prefix.'options' => self::getRedisOptions($c),
        ];
    }

    public static function castRedisArray(\RedisArray $c, array $a, Stub $stub, bool $isNested)
    {
        $prefix = Caster::PREFIX_VIRTUAL;

        return $a + [
            $prefix.'hosts' => $c->_hosts(),
            $prefix.'function' => ClassStub::wrapCallable($c->_function()),
            $prefix.'lastError' => $c->getLastError(),
            $prefix.'options' => self::getRedisOptions($c),
        ];
    }

    public static function castRedisCluster(\RedisCluster $c, array $a, Stub $stub, bool $isNested)
    {
        $prefix = Caster::PREFIX_VIRTUAL;
        $failover = $c->getOption(\RedisCluster::OPT_SLAVE_FAILOVER);

        $a += [
            $prefix.'_masters' => $c->_masters(),
            $prefix.'_redir' => $c->_redir(),
            $prefix.'mode' => new ConstStub($c->getMode() ? 'MULTI' : 'ATOMIC', $c->getMode()),
            $prefix.'lastError' => $c->getLastError(),
            $prefix.'options' => self::getRedisOptions($c, [
                'SLAVE_FAILOVER' => isset(self::FAILOVER_OPTIONS[$failover]) ? new ConstStub(self::FAILOVER_OPTIONS[$failover], $failover) : $failover,
            ]),
        ];

        return $a;
    }

    /**
     * @param \Redis|\RedisArray|\RedisCluster $redis
     */
    private static function getRedisOptions($redis, array $options = []): EnumStub
    {
        $serializer = $redis->getOption(\Redis::OPT_SERIALIZER);
        if (\is_array($serializer)) {
            foreach ($serializer as &$v) {
                if (isset(self::SERIALIZERS[$v])) {
                    $v = new ConstStub(self::SERIALIZERS[$v], $v);
                }
            }
        } elseif (isset(self::SERIALIZERS[$serializer])) {
            $serializer = new ConstStub(self::SERIALIZERS[$serializer], $serializer);
        }

        $compression = \defined('Redis::OPT_COMPRESSION') ? $redis->getOption(\Redis::OPT_COMPRESSION) : 0;
        if (\is_array($compression)) {
            foreach ($compression as &$v) {
                if (isset(self::COMPRESSION_MODES[$v])) {
                    $v = new ConstStub(self::COMPRESSION_MODES[$v], $v);
                }
            }
        } elseif (isset(self::COMPRESSION_MODES[$compression])) {
            $compression = new ConstStub(self::COMPRESSION_MODES[$compression], $compression);
        }

        $retry = \defined('Redis::OPT_SCAN') ? $redis->getOption(\Redis::OPT_SCAN) : 0;
        if (\is_array($retry)) {
            foreach ($retry as &$v) {
                $v = new ConstStub($v ? 'RETRY' : 'NORETRY', $v);
            }
        } else {
            $retry = new ConstStub($retry ? 'RETRY' : 'NORETRY', $retry);
        }

        $options += [
            'TCP_KEEPALIVE' => \defined('Redis::OPT_TCP_KEEPALIVE') ? $redis->getOption(\Redis::OPT_TCP_KEEPALIVE) : 0,
            'READ_TIMEOUT' => $redis->getOption(\Redis::OPT_READ_TIMEOUT),
            'COMPRESSION' => $compression,
            'SERIALIZER' => $serializer,
            'PREFIX' => $redis->getOption(\Redis::OPT_PREFIX),
            'SCAN' => $retry,
        ];

        return new EnumStub($options);
    }
}
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