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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\Cache\Adapter;
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 Rob Frawley 2nd <rmf@src.run>
* @author Nicolas Grekas <p@tchwork.com>
*/
class MemcachedAdapter extends AbstractAdapter
{
/**
* We are replacing characters that are illegal in Memcached keys with reserved characters from
* {@see \Symfony\Contracts\Cache\ItemInterface::RESERVED_CHARACTERS} that are legal in Memcached.
* Note: don’t use {@see \Symfony\Component\Cache\Adapter\AbstractAdapter::NS_SEPARATOR}.
*/
private const RESERVED_MEMCACHED = " \n\r\t\v\f\0";
private const RESERVED_PSR6 = '@()\{}/';
protected $maxIdLength = 250;
private MarshallerInterface $marshaller;
private \Memcached $client;
private \Memcached $lazyClient;
/**
* Using a MemcachedAdapter with a TagAwareAdapter for storing tags is discouraged.
* Using a RedisAdapter is recommended instead. If you cannot do otherwise, be aware that:
* - the Memcached::OPT_BINARY_PROTOCOL must be enabled
* (that's the default when using MemcachedAdapter::createConnection());
* - tags eviction by Memcached's LRU algorithm will break by-tags invalidation;
* your Memcached memory should be large enough to never trigger LRU.
*
* Using a MemcachedAdapter as a pure items store is fine.
*/
public function __construct(\Memcached $client, string $namespace = '', int $defaultLifetime = 0, MarshallerInterface $marshaller = null)
{
if (!static::isSupported()) {
throw new CacheException('Memcached > 3.1.5 is required.');
}
if ('Memcached' === $client::class) {
$opt = $client->getOption(\Memcached::OPT_SERIALIZER);
if (\Memcached::SERIALIZER_PHP !== $opt && \Memcached::SERIALIZER_IGBINARY !== $opt) {
throw new CacheException('MemcachedAdapter: "serializer" option must be "php" or "igbinary".');
}
$this->maxIdLength -= \strlen($client->getOption(\Memcached::OPT_PREFIX_KEY));
$this->client = $client;
} else {
$this->lazyClient = $client;
}
parent::__construct($namespace, $defaultLifetime);
$this->enableVersioning();
$this->marshaller = $marshaller ?? new DefaultMarshaller();
}
/**
* @return bool
*/
public static function isSupported()
{
return \extension_loaded('memcached') && version_compare(phpversion('memcached'), '3.1.6', '>=');
}
/**
* Creates a Memcached instance.
*
* By default, the binary protocol, no block, and libketama compatible options are enabled.
*
* Examples for servers:
* - 'memcached://user:pass@localhost?weight=33'
* - [['localhost', 11211, 33]]
*
* @param array[]|string|string[] $servers An array of servers, a DSN, or an array of DSNs
*
* @throws \ErrorException When invalid options or servers are provided
*/
public static function createConnection(#[\SensitiveParameter] array|string $servers, array $options = []): \Memcached
{
if (\is_string($servers)) {
$servers = [$servers];
}
if (!static::isSupported()) {
throw new CacheException('Memcached > 3.1.5 is required.');
}
set_error_handler(function ($type, $msg, $file, $line) { throw new \ErrorException($msg, 0, $type, $file, $line); });
try {
$client = new \Memcached($options['persistent_id'] ?? null);
$username = $options['username'] ?? null;
$password = $options['password'] ?? null;
// parse any DSN in $servers
foreach ($servers as $i => $dsn) {
if (\is_array($dsn)) {
continue;
}
if (!str_starts_with($dsn, 'memcached:')) {
throw new InvalidArgumentException('Invalid Memcached DSN: it does not start with "memcached:".');
}
$params = preg_replace_callback('#^memcached:(//)?(?:([^@]*+)@)?#', function ($m) use (&$username, &$password) {
if (!empty($m[2])) {
[$username, $password] = explode(':', $m[2], 2) + [1 => null];
}
return 'file:'.($m[1] ?? '');
}, $dsn);
if (false === $params = parse_url($params)) {
throw new InvalidArgumentException('Invalid Memcached DSN.');
}
$query = $hosts = [];
if (isset($params['query'])) {
parse_str($params['query'], $query);
if (isset($query['host'])) {
if (!\is_array($hosts = $query['host'])) {
throw new InvalidArgumentException('Invalid Memcached DSN: query parameter "host" must be an array.');
}
foreach ($hosts as $host => $weight) {
if (false === $port = strrpos($host, ':')) {
$hosts[$host] = [$host, 11211, (int) $weight];
} else {
$hosts[$host] = [substr($host, 0, $port), (int) substr($host, 1 + $port), (int) $weight];
}
}
$hosts = array_values($hosts);
unset($query['host']);
}
if ($hosts && !isset($params['host']) && !isset($params['path'])) {
unset($servers[$i]);
$servers = array_merge($servers, $hosts);
continue;
}
}
if (!isset($params['host']) && !isset($params['path'])) {
throw new InvalidArgumentException('Invalid Memcached DSN: missing host or path.');
}
if (isset($params['path']) && preg_match('#/(\d+)$#', $params['path'], $m)) {
$params['weight'] = $m[1];
$params['path'] = substr($params['path'], 0, -\strlen($m[0]));
}
$params += [
'host' => $params['host'] ?? $params['path'],
'port' => isset($params['host']) ? 11211 : null,
'weight' => 0,
];
if ($query) {
$params += $query;
$options = $query + $options;
}
$servers[$i] = [$params['host'], $params['port'], $params['weight']];
if ($hosts) {
$servers = array_merge($servers, $hosts);
}
}
// set client's options
unset($options['persistent_id'], $options['username'], $options['password'], $options['weight'], $options['lazy']);
$options = array_change_key_case($options, \CASE_UPPER);
$client->setOption(\Memcached::OPT_BINARY_PROTOCOL, true);
$client->setOption(\Memcached::OPT_NO_BLOCK, true);
$client->setOption(\Memcached::OPT_TCP_NODELAY, true);
if (!\array_key_exists('LIBKETAMA_COMPATIBLE', $options) && !\array_key_exists(\Memcached::OPT_LIBKETAMA_COMPATIBLE, $options)) {
$client->setOption(\Memcached::OPT_LIBKETAMA_COMPATIBLE, true);
}
foreach ($options as $name => $value) {
if (\is_int($name)) {
continue;
}
if ('HASH' === $name || 'SERIALIZER' === $name || 'DISTRIBUTION' === $name) {
$value = \constant('Memcached::'.$name.'_'.strtoupper($value));
}
unset($options[$name]);
if (\defined('Memcached::OPT_'.$name)) {
$options[\constant('Memcached::OPT_'.$name)] = $value;
}
}
$client->setOptions($options + [\Memcached::OPT_SERIALIZER => \Memcached::SERIALIZER_PHP]);
// set client's servers, taking care of persistent connections
if (!$client->isPristine()) {
$oldServers = [];
foreach ($client->getServerList() as $server) {
$oldServers[] = [$server['host'], $server['port']];
}
$newServers = [];
foreach ($servers as $server) {
if (1 < \count($server)) {
$server = array_values($server);
unset($server[2]);
$server[1] = (int) $server[1];
}
$newServers[] = $server;
}
if ($oldServers !== $newServers) {
$client->resetServerList();
$client->addServers($servers);
}
} else {
$client->addServers($servers);
}
if (null !== $username || null !== $password) {
if (!method_exists($client, 'setSaslAuthData')) {
trigger_error('Missing SASL support: the memcached extension must be compiled with --enable-memcached-sasl.');
}
$client->setSaslAuthData($username, $password);
}
return $client;
} finally {
restore_error_handler();
}
}
protected function doSave(array $values, int $lifetime): array|bool
{
if (!$values = $this->marshaller->marshall($values, $failed)) {
return $failed;
}
if ($lifetime && $lifetime > 30 * 86400) {
$lifetime += time();
}
$encodedValues = [];
foreach ($values as $key => $value) {
$encodedValues[self::encodeKey($key)] = $value;
}
return $this->checkResultCode($this->getClient()->setMulti($encodedValues, $lifetime)) ? $failed : false;
}
protected function doFetch(array $ids): iterable
{
try {
$encodedIds = array_map([__CLASS__, 'encodeKey'], $ids);
$encodedResult = $this->checkResultCode($this->getClient()->getMulti($encodedIds));
$result = [];
foreach ($encodedResult as $key => $value) {
$result[self::decodeKey($key)] = $this->marshaller->unmarshall($value);
}
return $result;
} catch (\Error $e) {
throw new \ErrorException($e->getMessage(), $e->getCode(), \E_ERROR, $e->getFile(), $e->getLine());
}
}
protected function doHave(string $id): bool
{
return false !== $this->getClient()->get(self::encodeKey($id)) || $this->checkResultCode(\Memcached::RES_SUCCESS === $this->client->getResultCode());
}
protected function doDelete(array $ids): bool
{
$ok = true;
$encodedIds = array_map([__CLASS__, 'encodeKey'], $ids);
foreach ($this->checkResultCode($this->getClient()->deleteMulti($encodedIds)) as $result) {
if (\Memcached::RES_SUCCESS !== $result && \Memcached::RES_NOTFOUND !== $result) {
$ok = false;
}
}
return $ok;
}
protected function doClear(string $namespace): bool
{
return '' === $namespace && $this->getClient()->flush();
}
private function checkResultCode(mixed $result): mixed
{
$code = $this->client->getResultCode();
if (\Memcached::RES_SUCCESS === $code || \Memcached::RES_NOTFOUND === $code) {
return $result;
}
throw new CacheException('MemcachedAdapter client error: '.strtolower($this->client->getResultMessage()));
}
private function getClient(): \Memcached
{
if (isset($this->client)) {
return $this->client;
}
$opt = $this->lazyClient->getOption(\Memcached::OPT_SERIALIZER);
if (\Memcached::SERIALIZER_PHP !== $opt && \Memcached::SERIALIZER_IGBINARY !== $opt) {
throw new CacheException('MemcachedAdapter: "serializer" option must be "php" or "igbinary".');
}
if ('' !== $prefix = (string) $this->lazyClient->getOption(\Memcached::OPT_PREFIX_KEY)) {
throw new CacheException(sprintf('MemcachedAdapter: "prefix_key" option must be empty when using proxified connections, "%s" given.', $prefix));
}
return $this->client = $this->lazyClient;
}
private static function encodeKey(string $key): string
{
return strtr($key, self::RESERVED_MEMCACHED, self::RESERVED_PSR6);
}
private static function decodeKey(string $key): string
{
return strtr($key, self::RESERVED_PSR6, self::RESERVED_MEMCACHED);
}
}
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