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<?php |
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namespace RemotelyLiving\PHPDNS\Resolvers; |
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use RemotelyLiving\PHPDNS\Entities\DNSRecord; |
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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\Observability\Interfaces\Observable; |
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use RemotelyLiving\PHPDNS\Resolvers\Exceptions\QueryFailure; |
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use RemotelyLiving\PHPDNS\Resolvers\Interfaces; |
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use RemotelyLiving\PHPDNS\Resolvers\Interfaces\Resolver; |
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use Symfony\Component\EventDispatcher\EventSubscriberInterface; |
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class Chain extends ResolverAbstract implements Interfaces\Chain |
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{ |
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const STRATEGY_FIRST_TO_FIND = 0; |
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const STRATEGY_ALL_RESULTS = 1; |
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const STRATEGY_CONSENSUS = 2; |
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/** |
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* @var \RemotelyLiving\PHPDNS\Resolvers\Interfaces\Resolver[] |
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*/ |
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private $resolvers; |
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/** |
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* @var int |
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*/ |
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private $callThroughStrategy = self::STRATEGY_FIRST_TO_FIND; |
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public function __construct(array $resolvers = []) |
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{ |
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foreach ($resolvers as $resolver) { |
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$this->pushResolver($resolver); |
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} |
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} |
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public function pushResolver(Resolver...$resolvers): void |
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{ |
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foreach ($resolvers as $resolver) { |
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$this->resolvers[] = $resolver; |
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} |
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} |
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public function withAllResults(): Interfaces\Chain |
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{ |
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$all = new self($this->resolvers); |
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$all->callThroughStrategy = self::STRATEGY_ALL_RESULTS; |
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return $all; |
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} |
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public function withFirstResults(): Interfaces\Chain |
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{ |
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$first = new self($this->resolvers); |
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$first->callThroughStrategy = self::STRATEGY_FIRST_TO_FIND; |
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return $first; |
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} |
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public function withConsensusResults(): Interfaces\Chain |
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{ |
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$consensus = new self($this->resolvers); |
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$consensus->callThroughStrategy = self::STRATEGY_CONSENSUS; |
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return $consensus; |
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} |
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public function randomly(): Interfaces\Chain |
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{ |
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$randomized = clone $this; |
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shuffle($randomized->resolvers); |
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return $randomized; |
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} |
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public function addSubscriber(EventSubscriberInterface $subscriber): void |
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{ |
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foreach ($this->resolvers as $resolver) { |
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if ($resolver instanceof Observable) { |
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$resolver->addSubscriber($subscriber); |
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} |
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} |
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} |
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public function addListener(string $eventName, callable $listener, int $priority = 0): void |
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{ |
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foreach ($this->resolvers as $resolver) { |
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if ($resolver instanceof Observable) { |
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$resolver->addListener($eventName, $listener, $priority); |
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} |
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} |
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} |
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public function hasRecord(DNSRecord $record): bool |
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{ |
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foreach ($this->resolvers as $resolver) { |
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if ($resolver->hasRecord($record)) { |
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return true; |
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} |
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} |
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return false; |
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} |
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protected function doQuery(Hostname $hostname, DNSRecordType $recordType): DNSRecordCollection |
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{ |
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$merged = []; |
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foreach ($this->resolvers as $resolver) { |
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try { |
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$records = $resolver->getRecords($hostname, $recordType); |
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} catch (QueryFailure $e) { |
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continue; |
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} |
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if ($this->callThroughStrategy === self::STRATEGY_FIRST_TO_FIND && !$records->isEmpty()) { |
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return $records; |
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} |
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/** @var DNSRecord $record */ |
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foreach ($records as $record) { |
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$merged[] = $record; |
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} |
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} |
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$collection = new DNSRecordCollection(...$merged); |
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return ($this->callThroughStrategy === self::STRATEGY_CONSENSUS) |
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? $collection->withUniqueValuesExcluded() |
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: $collection->withUniqueValues(); |
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} |
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} |
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remotelyliving /
php-dns
