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<?php |
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namespace RemotelyLiving\PHPDNS\Resolvers; |
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use Psr\Cache\CacheItemPoolInterface; |
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use RemotelyLiving\PHPDNS\Entities\DNSRecordCollection; |
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use RemotelyLiving\PHPDNS\Entities\DNSRecordType; |
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use RemotelyLiving\PHPDNS\Entities\Hostname; |
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use RemotelyLiving\PHPDNS\Resolvers\Interfaces\Resolver; |
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class Cached extends ResolverAbstract |
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{ |
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protected const DEFAULT_CACHE_TTL = 300; |
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private const CACHE_KEY_TEMPLATE = '%s:%s:%s'; |
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/** |
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* @var \Psr\Cache\CacheItemPoolInterface |
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*/ |
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private $cache; |
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/** |
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* @var \RemotelyLiving\PHPDNS\Resolvers\Interfaces\Resolver |
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*/ |
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private $resolver; |
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/** |
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* @var string |
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*/ |
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private $namespace = 'php-dns'; |
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/** |
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* @var int|null |
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*/ |
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private $ttlSeconds; |
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public function __construct(CacheItemPoolInterface $cache, Resolver $resolver, int $ttlSeconds = null) |
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{ |
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$this->cache = $cache; |
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$this->resolver = $resolver; |
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$this->ttlSeconds = $ttlSeconds; |
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} |
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public function flush(): void |
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{ |
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$this->cache->clear(); |
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} |
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protected function doQuery(Hostname $hostname, DNSRecordType $recordType): DNSRecordCollection |
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{ |
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$cachedResult = $this->cache->getItem($this->buildCacheKey($hostname, $recordType)); |
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if ($cachedResult->isHit()) { |
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return $cachedResult->get(); |
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} |
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$dnsRecords = $this->resolver->getRecords((string)$hostname, (string)$recordType); |
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$ttlSeconds = $this->ttlSeconds ?? $this->extractLowestTTL($dnsRecords); |
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$cachedResult->expiresAfter($ttlSeconds); |
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$cachedResult->set($dnsRecords); |
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$this->cache->save($cachedResult); |
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return $dnsRecords; |
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} |
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private function buildCacheKey(Hostname $hostname, DNSRecordType $recordType): string |
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{ |
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return md5(sprintf(self::CACHE_KEY_TEMPLATE, $this->namespace, (string)$hostname, (string)$recordType)); |
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} |
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private function extractLowestTTL(DNSRecordCollection $recordCollection): int |
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{ |
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$ttls = []; |
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if ($recordCollection->isEmpty()) { |
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return self::DEFAULT_CACHE_TTL; |
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} |
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/** @var \RemotelyLiving\PHPDNS\Entities\DNSRecord $record */ |
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foreach ($recordCollection as $record) { |
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/** @scrutinizer ignore-call */ |
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$ttls[] = $record->getTTL(); |
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} |
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return min($ttls); |
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} |
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} |
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remotelyliving /
php-dns
