<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <[email protected]>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\Cache\Traits;
use Predis\Command\Redis\UNLINK;
use Predis\Connection\Aggregate\ClusterInterface;
use Predis\Connection\Aggregate\RedisCluster;
use Predis\Connection\Aggregate\ReplicationInterface;
use Predis\Connection\Cluster\ClusterInterface as Predis2ClusterInterface;
use Predis\Connection\Cluster\RedisCluster as Predis2RedisCluster;
use Predis\Response\ErrorInterface;
use Predis\Response\Status;
use Relay\Relay;
use Relay\Sentinel;
use Symfony\Component\Cache\Exception\CacheException;
use Symfony\Component\Cache\Exception\InvalidArgumentException;
use Symfony\Component\Cache\Marshaller\DefaultMarshaller;
use Symfony\Component\Cache\Marshaller\MarshallerInterface;
/**
* @author Aurimas Niekis <[email protected]>
* @author Nicolas Grekas <[email protected]>
*
* @internal
*/
trait RedisTrait
{
private static array $defaultConnectionOptions = [
'class' => null,
'persistent' => 0,
'persistent_id' => null,
'timeout' => 30,
'read_timeout' => 0,
'retry_interval' => 0,
'tcp_keepalive' => 0,
'lazy' => null,
'redis_cluster' => false,
'redis_sentinel' => null,
'dbindex' => 0,
'failover' => 'none',
'ssl' => null, // see https://php.net/context.ssl
];
private \Redis|Relay|\RedisArray|\RedisCluster|\Predis\ClientInterface $redis;
private MarshallerInterface $marshaller;
private function init(\Redis|Relay|\RedisArray|\RedisCluster|\Predis\ClientInterface $redis, string $namespace, int $defaultLifetime, ?MarshallerInterface $marshaller): void
{
parent::__construct($namespace, $defaultLifetime);
if (preg_match('#[^-+_.A-Za-z0-9]#', $namespace, $match)) {
throw new InvalidArgumentException(sprintf('RedisAdapter namespace contains "%s" but only characters in [-+_.A-Za-z0-9] are allowed.', $match[0]));
}
if ($redis instanceof \Predis\ClientInterface && $redis->getOptions()->exceptions) {
$options = clone $redis->getOptions();
\Closure::bind(function () { $this->options['exceptions'] = false; }, $options, $options)();
$redis = new $redis($redis->getConnection(), $options);
}
$this->redis = $redis;
$this->marshaller = $marshaller ?? new DefaultMarshaller();
}
/**
* Creates a Redis connection using a DSN configuration.
*
* Example DSN:
* - redis://localhost
* - redis://example.com:1234
* - redis://[email protected]/13
* - redis:///var/run/redis.sock
* - redis://secret@/var/run/redis.sock/13
*
* @param array $options See self::$defaultConnectionOptions
*
* @throws InvalidArgumentException when the DSN is invalid
*/
public static function createConnection(#[\SensitiveParameter] string $dsn, array $options = []): \Redis|\RedisArray|\RedisCluster|\Predis\ClientInterface|Relay
{
if (str_starts_with($dsn, 'redis:')) {
$scheme = 'redis';
} elseif (str_starts_with($dsn, 'rediss:')) {
$scheme = 'rediss';
} else {
throw new InvalidArgumentException('Invalid Redis DSN: it does not start with "redis[s]:".');
}
if (!\extension_loaded('redis') && !class_exists(\Predis\Client::class)) {
throw new CacheException('Cannot find the "redis" extension nor the "predis/predis" package.');
}
$params = preg_replace_callback('#^'.$scheme.':(//)?(?:(?:(?<user>[^:@]*+):)?(?<password>[^@]*+)@)?#', function ($m) use (&$auth) {
if (isset($m['password'])) {
if (\in_array($m['user'], ['', 'default'], true)) {
$auth = rawurldecode($m['password']);
} else {
$auth = [rawurldecode($m['user']), rawurldecode($m['password'])];
}
if ('' === $auth) {
$auth = null;
}
}
return 'file:'.($m[1] ?? '');
}, $dsn);
if (false === $params = parse_url($params)) {
throw new InvalidArgumentException('Invalid Redis DSN.');
}
$query = $hosts = [];
$tls = 'rediss' === $scheme;
$tcpScheme = $tls ? 'tls' : 'tcp';
if (isset($params['query'])) {
parse_str($params['query'], $query);
if (isset($query['host'])) {
if (!\is_array($hosts = $query['host'])) {
throw new InvalidArgumentException('Invalid Redis DSN: query parameter "host" must be an array.');
}
foreach ($hosts as $host => $parameters) {
if (\is_string($parameters)) {
parse_str($parameters, $parameters);
}
if (false === $i = strrpos($host, ':')) {
$hosts[$host] = ['scheme' => $tcpScheme, 'host' => $host, 'port' => 6379] + $parameters;
} elseif ($port = (int) substr($host, 1 + $i)) {
$hosts[$host] = ['scheme' => $tcpScheme, 'host' => substr($host, 0, $i), 'port' => $port] + $parameters;
} else {
$hosts[$host] = ['scheme' => 'unix', 'path' => substr($host, 0, $i)] + $parameters;
}
}
$hosts = array_values($hosts);
}
}
if (isset($params['host']) || isset($params['path'])) {
if (!isset($params['dbindex']) && isset($params['path'])) {
if (preg_match('#/(\d+)?$#', $params['path'], $m)) {
$params['dbindex'] = $m[1] ?? $query['dbindex'] ?? '0';
$params['path'] = substr($params['path'], 0, -\strlen($m[0]));
} elseif (isset($params['host'])) {
throw new InvalidArgumentException('Invalid Redis DSN: parameter "dbindex" must be a number.');
}
}
if (isset($params['host'])) {
array_unshift($hosts, ['scheme' => $tcpScheme, 'host' => $params['host'], 'port' => $params['port'] ?? 6379]);
} else {
array_unshift($hosts, ['scheme' => 'unix', 'path' => $params['path']]);
}
}
if (!$hosts) {
throw new InvalidArgumentException('Invalid Redis DSN: missing host.');
}
if (isset($params['dbindex'], $query['dbindex']) && $params['dbindex'] !== $query['dbindex']) {
throw new InvalidArgumentException('Invalid Redis DSN: path and query "dbindex" parameters mismatch.');
}
$params += $query + $options + self::$defaultConnectionOptions;
if (isset($params['redis_sentinel']) && !class_exists(\Predis\Client::class) && !class_exists(\RedisSentinel::class) && !class_exists(Sentinel::class)) {
throw new CacheException('Redis Sentinel support requires one of: "predis/predis", "ext-redis >= 5.2", "ext-relay".');
}
if (isset($params['lazy'])) {
$params['lazy'] = filter_var($params['lazy'], \FILTER_VALIDATE_BOOLEAN);
}
$params['redis_cluster'] = filter_var($params['redis_cluster'], \FILTER_VALIDATE_BOOLEAN);
if ($params['redis_cluster'] && isset($params['redis_sentinel'])) {
throw new InvalidArgumentException('Cannot use both "redis_cluster" and "redis_sentinel" at the same time.');
}
$class = $params['class'] ?? match (true) {
$params['redis_cluster'] => \extension_loaded('redis') ? \RedisCluster::class : \Predis\Client::class,
isset($params['redis_sentinel']) => match (true) {
\extension_loaded('redis') => \Redis::class,
\extension_loaded('relay') => Relay::class,
default => \Predis\Client::class,
},
1 < \count($hosts) && \extension_loaded('redis') => 1 < \count($hosts) ? \RedisArray::class : \Redis::class,
\extension_loaded('redis') => \Redis::class,
\extension_loaded('relay') => Relay::class,
default => \Predis\Client::class,
};
if (isset($params['redis_sentinel']) && !is_a($class, \Predis\Client::class, true) && !class_exists(\RedisSentinel::class) && !class_exists(Sentinel::class)) {
throw new CacheException(sprintf('Cannot use Redis Sentinel: class "%s" does not extend "Predis\Client" and neither ext-redis >= 5.2 nor ext-relay have been found.', $class));
}
$isRedisExt = is_a($class, \Redis::class, true);
$isRelayExt = !$isRedisExt && is_a($class, Relay::class, true);
if ($isRedisExt || $isRelayExt) {
$connect = $params['persistent'] || $params['persistent_id'] ? 'pconnect' : 'connect';
$initializer = static function () use ($class, $isRedisExt, $connect, $params, $auth, $hosts, $tls) {
$sentinelClass = $isRedisExt ? \RedisSentinel::class : Sentinel::class;
$redis = new $class();
$hostIndex = 0;
do {
$host = $hosts[$hostIndex]['host'] ?? $hosts[$hostIndex]['path'];
$port = $hosts[$hostIndex]['port'] ?? 0;
$passAuth = isset($params['auth']) && (!$isRedisExt || \defined('Redis::OPT_NULL_MULTIBULK_AS_NULL'));
$address = false;
if (isset($hosts[$hostIndex]['host']) && $tls) {
$host = 'tls://'.$host;
}
if (!isset($params['redis_sentinel'])) {
break;
}
try {
if (version_compare(phpversion('redis'), '6.0.0', '>=') && $isRedisExt) {
$options = [
'host' => $host,
'port' => $port,
'connectTimeout' => (float) $params['timeout'],
'persistent' => $params['persistent_id'],
'retryInterval' => (int) $params['retry_interval'],
'readTimeout' => (float) $params['read_timeout'],
];
if ($passAuth) {
$options['auth'] = $params['auth'];
}
$sentinel = new \RedisSentinel($options);
} else {
$extra = $passAuth ? [$params['auth']] : [];
$sentinel = @new $sentinelClass($host, $port, $params['timeout'], (string) $params['persistent_id'], $params['retry_interval'], $params['read_timeout'], ...$extra);
}
if ($address = @$sentinel->getMasterAddrByName($params['redis_sentinel'])) {
[$host, $port] = $address;
}
} catch (\RedisException|\Relay\Exception $redisException) {
}
} while (++$hostIndex < \count($hosts) && !$address);
if (isset($params['redis_sentinel']) && !$address) {
throw new InvalidArgumentException(sprintf('Failed to retrieve master information from sentinel "%s".', $params['redis_sentinel']), previous: $redisException ?? null);
}
try {
$extra = [
'stream' => $params['ssl'] ?? null,
];
$booleanStreamOptions = [
'allow_self_signed',
'capture_peer_cert',
'capture_peer_cert_chain',
'disable_compression',
'SNI_enabled',
'verify_peer',
'verify_peer_name',
];
foreach ($extra['stream'] ?? [] as $streamOption => $value) {
if (\in_array($streamOption, $booleanStreamOptions, true) && \is_string($value)) {
$extra['stream'][$streamOption] = filter_var($value, \FILTER_VALIDATE_BOOL);
}
}
if (isset($params['auth'])) {
$extra['auth'] = $params['auth'];
}
@$redis->{$connect}($host, $port, (float) $params['timeout'], (string) $params['persistent_id'], $params['retry_interval'], $params['read_timeout'], ...\defined('Redis::SCAN_PREFIX') || !$isRedisExt ? [$extra] : []);
set_error_handler(function ($type, $msg) use (&$error) { $error = $msg; });
try {
$isConnected = $redis->isConnected();
} finally {
restore_error_handler();
}
if (!$isConnected) {
$error = preg_match('/^Redis::p?connect\(\): (.*)/', $error ?? $redis->getLastError() ?? '', $error) ? sprintf(' (%s)', $error[1]) : '';
throw new InvalidArgumentException('Redis connection failed: '.$error.'.');
}
if ((null !== $auth && !$redis->auth($auth))
// Due to a bug in phpredis we must always select the dbindex if persistent pooling is enabled
// @see https://github.com/phpredis/phpredis/issues/1920
// @see https://github.com/symfony/symfony/issues/51578
|| (($params['dbindex'] || ('pconnect' === $connect && '0' !== \ini_get('redis.pconnect.pooling_enabled'))) && !$redis->select($params['dbindex']))
) {
$e = preg_replace('/^ERR /', '', $redis->getLastError());
throw new InvalidArgumentException('Redis connection failed: '.$e.'.');
}
if (0 < $params['tcp_keepalive'] && (!$isRedisExt || \defined('Redis::OPT_TCP_KEEPALIVE'))) {
$redis->setOption($isRedisExt ? \Redis::OPT_TCP_KEEPALIVE : Relay::OPT_TCP_KEEPALIVE, $params['tcp_keepalive']);
}
} catch (\RedisException|\Relay\Exception $e) {
throw new InvalidArgumentException('Redis connection failed: '.$e->getMessage());
}
return $redis;
};
if ($params['lazy']) {
$redis = $isRedisExt ? RedisProxy::createLazyProxy($initializer) : RelayProxy::createLazyProxy($initializer);
} else {
$redis = $initializer();
}
} elseif (is_a($class, \RedisArray::class, true)) {
foreach ($hosts as $i => $host) {
$hosts[$i] = match ($host['scheme']) {
'tcp' => $host['host'].':'.$host['port'],
'tls' => 'tls://'.$host['host'].':'.$host['port'],
default => $host['path'],
};
}
$params['lazy_connect'] = $params['lazy'] ?? true;
$params['connect_timeout'] = $params['timeout'];
try {
$redis = new $class($hosts, $params);
} catch (\RedisClusterException $e) {
throw new InvalidArgumentException('Redis connection failed: '.$e->getMessage());
}
if (0 < $params['tcp_keepalive'] && (!$isRedisExt || \defined('Redis::OPT_TCP_KEEPALIVE'))) {
$redis->setOption($isRedisExt ? \Redis::OPT_TCP_KEEPALIVE : Relay::OPT_TCP_KEEPALIVE, $params['tcp_keepalive']);
}
} elseif (is_a($class, \RedisCluster::class, true)) {
$initializer = static function () use ($isRedisExt, $class, $params, $hosts) {
foreach ($hosts as $i => $host) {
$hosts[$i] = match ($host['scheme']) {
'tcp' => $host['host'].':'.$host['port'],
'tls' => 'tls://'.$host['host'].':'.$host['port'],
default => $host['path'],
};
}
try {
$redis = new $class(null, $hosts, $params['timeout'], $params['read_timeout'], (bool) $params['persistent'], $params['auth'] ?? '', ...\defined('Redis::SCAN_PREFIX') ? [$params['ssl'] ?? null] : []);
} catch (\RedisClusterException $e) {
throw new InvalidArgumentException('Redis connection failed: '.$e->getMessage());
}
if (0 < $params['tcp_keepalive'] && (!$isRedisExt || \defined('Redis::OPT_TCP_KEEPALIVE'))) {
$redis->setOption($isRedisExt ? \Redis::OPT_TCP_KEEPALIVE : Relay::OPT_TCP_KEEPALIVE, $params['tcp_keepalive']);
}
$redis->setOption(\RedisCluster::OPT_SLAVE_FAILOVER, match ($params['failover']) {
'error' => \RedisCluster::FAILOVER_ERROR,
'distribute' => \RedisCluster::FAILOVER_DISTRIBUTE,
'slaves' => \RedisCluster::FAILOVER_DISTRIBUTE_SLAVES,
'none' => \RedisCluster::FAILOVER_NONE,
});
return $redis;
};
$redis = $params['lazy'] ? RedisClusterProxy::createLazyProxy($initializer) : $initializer();
} elseif (is_a($class, \Predis\ClientInterface::class, true)) {
if ($params['redis_cluster']) {
$params['cluster'] = 'redis';
} elseif (isset($params['redis_sentinel'])) {
$params['replication'] = 'sentinel';
$params['service'] = $params['redis_sentinel'];
}
$params += ['parameters' => []];
$params['parameters'] += [
'persistent' => $params['persistent'],
'timeout' => $params['timeout'],
'read_write_timeout' => $params['read_timeout'],
'tcp_nodelay' => true,
];
if ($params['dbindex']) {
$params['parameters']['database'] = $params['dbindex'];
}
if (null !== $auth) {
if (\is_array($auth)) {
// ACL
$params['parameters']['username'] = $auth[0];
$params['parameters']['password'] = $auth[1];
} else {
$params['parameters']['password'] = $auth;
}
}
if (isset($params['ssl'])) {
foreach ($hosts as $i => $host) {
$hosts[$i]['ssl'] ??= $params['ssl'];
}
}
if (1 === \count($hosts) && !($params['redis_cluster'] || $params['redis_sentinel'])) {
$hosts = $hosts[0];
} elseif (\in_array($params['failover'], ['slaves', 'distribute'], true) && !isset($params['replication'])) {
$params['replication'] = true;
$hosts[0] += ['alias' => 'master'];
}
$params['exceptions'] = false;
$redis = new $class($hosts, array_diff_key($params, self::$defaultConnectionOptions));
if (isset($params['redis_sentinel'])) {
$redis->getConnection()->setSentinelTimeout($params['timeout']);
}
} elseif (class_exists($class, false)) {
throw new InvalidArgumentException(sprintf('"%s" is not a subclass of "Redis", "RedisArray", "RedisCluster", "Relay\Relay" nor "Predis\ClientInterface".', $class));
} else {
throw new InvalidArgumentException(sprintf('Class "%s" does not exist.', $class));
}
return $redis;
}
protected function doFetch(array $ids): iterable
{
if (!$ids) {
return [];
}
$result = [];
if ($this->redis instanceof \Predis\ClientInterface && ($this->redis->getConnection() instanceof ClusterInterface || $this->redis->getConnection() instanceof Predis2ClusterInterface)) {
$values = $this->pipeline(function () use ($ids) {
foreach ($ids as $id) {
yield 'get' => [$id];
}
});
} else {
$values = $this->redis->mget($ids);
if (!\is_array($values) || \count($values) !== \count($ids)) {
return [];
}
$values = array_combine($ids, $values);
}
foreach ($values as $id => $v) {
if ($v) {
$result[$id] = $this->marshaller->unmarshall($v);
}
}
return $result;
}
protected function doHave(string $id): bool
{
return (bool) $this->redis->exists($id);
}
protected function doClear(string $namespace): bool
{
if ($this->redis instanceof \Predis\ClientInterface) {
$prefix = $this->redis->getOptions()->prefix ? $this->redis->getOptions()->prefix->getPrefix() : '';
$prefixLen = \strlen($prefix ?? '');
}
$cleared = true;
$hosts = $this->getHosts();
$host = reset($hosts);
if ($host instanceof \Predis\Client && $host->getConnection() instanceof ReplicationInterface) {
// Predis supports info command only on the master in replication environments
$hosts = [$host->getClientFor('master')];
}
foreach ($hosts as $host) {
if (!isset($namespace[0])) {
$cleared = $host->flushDb() && $cleared;
continue;
}
$info = $host->info('Server');
$info = !$info instanceof ErrorInterface ? $info['Server'] ?? $info : ['redis_version' => '2.0'];
if ($host instanceof Relay) {
$prefix = Relay::SCAN_PREFIX & $host->getOption(Relay::OPT_SCAN) ? '' : $host->getOption(Relay::OPT_PREFIX);
$prefixLen = \strlen($host->getOption(Relay::OPT_PREFIX) ?? '');
} elseif (!$host instanceof \Predis\ClientInterface) {
$prefix = \defined('Redis::SCAN_PREFIX') && (\Redis::SCAN_PREFIX & $host->getOption(\Redis::OPT_SCAN)) ? '' : $host->getOption(\Redis::OPT_PREFIX);
$prefixLen = \strlen($host->getOption(\Redis::OPT_PREFIX) ?? '');
}
$pattern = $prefix.$namespace.'*';
if (!version_compare($info['redis_version'], '2.8', '>=')) {
// As documented in Redis documentation (http://redis.io/commands/keys) using KEYS
// can hang your server when it is executed against large databases (millions of items).
// Whenever you hit this scale, you should really consider upgrading to Redis 2.8 or above.
$unlink = version_compare($info['redis_version'], '4.0', '>=') ? 'UNLINK' : 'DEL';
$args = $this->redis instanceof \Predis\ClientInterface ? [0, $pattern] : [[$pattern], 0];
$cleared = $host->eval("local keys=redis.call('KEYS',ARGV[1]) for i=1,#keys,5000 do redis.call('$unlink',unpack(keys,i,math.min(i+4999,#keys))) end return 1", $args[0], $args[1]) && $cleared;
continue;
}
$cursor = null;
do {
$keys = $host instanceof \Predis\ClientInterface ? $host->scan($cursor ?? 0, 'MATCH', $pattern, 'COUNT', 1000) : $host->scan($cursor, $pattern, 1000);
if (isset($keys[1]) && \is_array($keys[1])) {
$cursor = $keys[0];
$keys = $keys[1];
}
if ($keys) {
if ($prefixLen) {
foreach ($keys as $i => $key) {
$keys[$i] = substr($key, $prefixLen);
}
}
$this->doDelete($keys);
}
} while ($cursor);
}
return $cleared;
}
protected function doDelete(array $ids): bool
{
if (!$ids) {
return true;
}
if ($this->redis instanceof \Predis\ClientInterface && ($this->redis->getConnection() instanceof ClusterInterface || $this->redis->getConnection() instanceof Predis2ClusterInterface)) {
static $del;
$del ??= (class_exists(UNLINK::class) ? 'unlink' : 'del');
$this->pipeline(function () use ($ids, $del) {
foreach ($ids as $id) {
yield $del => [$id];
}
})->rewind();
} else {
static $unlink = true;
if ($unlink) {
try {
$unlink = false !== $this->redis->unlink($ids);
} catch (\Throwable) {
$unlink = false;
}
}
if (!$unlink) {
$this->redis->del($ids);
}
}
return true;
}
protected function doSave(array $values, int $lifetime): array|bool
{
if (!$values = $this->marshaller->marshall($values, $failed)) {
return $failed;
}
$results = $this->pipeline(function () use ($values, $lifetime) {
foreach ($values as $id => $value) {
if (0 >= $lifetime) {
yield 'set' => [$id, $value];
} else {
yield 'setEx' => [$id, $lifetime, $value];
}
}
});
foreach ($results as $id => $result) {
if (true !== $result && (!$result instanceof Status || Status::get('OK') !== $result)) {
$failed[] = $id;
}
}
return $failed;
}
private function pipeline(\Closure $generator, ?object $redis = null): \Generator
{
$ids = [];
$redis ??= $this->redis;
if ($redis instanceof \RedisCluster || ($redis instanceof \Predis\ClientInterface && ($redis->getConnection() instanceof RedisCluster || $redis->getConnection() instanceof Predis2RedisCluster))) {
// phpredis & predis don't support pipelining with RedisCluster
// see https://github.com/phpredis/phpredis/blob/develop/cluster.markdown#pipelining
// see https://github.com/nrk/predis/issues/267#issuecomment-123781423
$results = [];
foreach ($generator() as $command => $args) {
$results[] = $redis->{$command}(...$args);
$ids[] = 'eval' === $command ? ($redis instanceof \Predis\ClientInterface ? $args[2] : $args[1][0]) : $args[0];
}
} elseif ($redis instanceof \Predis\ClientInterface) {
$results = $redis->pipeline(static function ($redis) use ($generator, &$ids) {
foreach ($generator() as $command => $args) {
$redis->{$command}(...$args);
$ids[] = 'eval' === $command ? $args[2] : $args[0];
}
});
} elseif ($redis instanceof \RedisArray) {
$connections = $results = $ids = [];
foreach ($generator() as $command => $args) {
$id = 'eval' === $command ? $args[1][0] : $args[0];
if (!isset($connections[$h = $redis->_target($id)])) {
$connections[$h] = [$redis->_instance($h), -1];
$connections[$h][0]->multi(\Redis::PIPELINE);
}
$connections[$h][0]->{$command}(...$args);
$results[] = [$h, ++$connections[$h][1]];
$ids[] = $id;
}
foreach ($connections as $h => $c) {
$connections[$h] = $c[0]->exec();
}
foreach ($results as $k => [$h, $c]) {
$results[$k] = $connections[$h][$c];
}
} else {
$redis->multi($redis instanceof Relay ? Relay::PIPELINE : \Redis::PIPELINE);
foreach ($generator() as $command => $args) {
$redis->{$command}(...$args);
$ids[] = 'eval' === $command ? $args[1][0] : $args[0];
}
$results = $redis->exec();
}
if (!$redis instanceof \Predis\ClientInterface && 'eval' === $command && $redis->getLastError()) {
$e = $redis instanceof Relay ? new \Relay\Exception($redis->getLastError()) : new \RedisException($redis->getLastError());
$results = array_map(fn ($v) => false === $v ? $e : $v, (array) $results);
}
if (\is_bool($results)) {
return;
}
foreach ($ids as $k => $id) {
yield $id => $results[$k];
}
}
private function getHosts(): array
{
$hosts = [$this->redis];
if ($this->redis instanceof \Predis\ClientInterface) {
$connection = $this->redis->getConnection();
if (($connection instanceof ClusterInterface || $connection instanceof Predis2ClusterInterface) && $connection instanceof \Traversable) {
$hosts = [];
foreach ($connection as $c) {
$hosts[] = new \Predis\Client($c);
}
}
} elseif ($this->redis instanceof \RedisArray) {
$hosts = [];
foreach ($this->redis->_hosts() as $host) {
$hosts[] = $this->redis->_instance($host);
}
} elseif ($this->redis instanceof \RedisCluster) {
$hosts = [];
foreach ($this->redis->_masters() as $host) {
$hosts[] = new RedisClusterNodeProxy($host, $this->redis);
}
}
return $hosts;
}
}