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<?php declare(strict_types=1); |
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/** |
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* This file is part of the daikon-cqrs/message-bus project. |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace Daikon\MessageBus\Channel\Subscription; |
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use Closure; |
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use Daikon\MessageBus\Channel\Subscription\MessageHandler\MessageHandlerList; |
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use Daikon\MessageBus\Channel\Subscription\Transport\TransportInterface; |
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use Daikon\MessageBus\EnvelopeInterface; |
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use Daikon\MessageBus\Error\EnvelopeNotAcceptable; |
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use Daikon\MessageBus\MessageBusInterface; |
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use Daikon\Metadata\MetadataInterface; |
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use Daikon\Metadata\MetadataEnricherInterface; |
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use Daikon\Metadata\MetadataEnricherList; |
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final class Subscription implements SubscriptionInterface |
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{ |
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private string $key; |
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private TransportInterface $transport; |
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private MessageHandlerList $messageHandlers; |
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private Closure $guard; |
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private MetadataEnricherList $metadataEnrichers; |
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public function __construct( |
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string $key, |
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TransportInterface $transport, |
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MessageHandlerList $messageHandlers, |
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Closure $guard = null, |
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MetadataEnricherList $metadataEnrichers = null |
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) { |
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$this->key = $key; |
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$this->transport = $transport; |
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$this->messageHandlers = $messageHandlers; |
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$this->guard = $guard ?? fn(): bool => true; |
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$metadataEnrichers = $metadataEnrichers ?? new MetadataEnricherList; |
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$this->metadataEnrichers = $metadataEnrichers->prependEnricher(self::METADATA_KEY, $this->key); |
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} |
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public function publish(EnvelopeInterface $envelope, MessageBusInterface $messageBus): void |
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{ |
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$envelope = $this->enrichMetadata($envelope); |
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if ($this->accepts($envelope)) { |
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$this->transport->send($envelope, $messageBus); |
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} |
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} |
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public function receive(EnvelopeInterface $envelope): void |
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{ |
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$this->verify($envelope); |
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foreach ($this->messageHandlers as $messageHandler) { |
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$messageHandler->handle($envelope); |
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} |
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} |
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public function getKey(): string |
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{ |
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return $this->key; |
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} |
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private function enrichMetadata(EnvelopeInterface $envelope): EnvelopeInterface |
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{ |
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return $envelope->withMetadata(array_reduce( |
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$this->metadataEnrichers->unwrap(), |
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function (MetadataInterface $metadata, MetadataEnricherInterface $metadataEnricher): MetadataInterface { |
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return $metadataEnricher->enrich($metadata); |
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}, |
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$envelope->getMetadata() |
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)); |
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} |
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private function accepts(EnvelopeInterface $envelope): bool |
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{ |
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return (bool)call_user_func($this->guard, $envelope); |
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} |
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private function verify(EnvelopeInterface $envelope): void |
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{ |
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$metadata = $envelope->getMetadata(); |
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if (!$metadata->has(self::METADATA_KEY)) { |
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throw new EnvelopeNotAcceptable( |
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"Subscription key '".self::METADATA_KEY."' missing in metadata of Envelope ". |
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"'{$envelope->getUuid()->toString()}' received by subscription '{$this->key}'.", |
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EnvelopeNotAcceptable::SUBSCRIPTION_KEY_MISSING |
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); |
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} |
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$subscriptionKey = $metadata->get(self::METADATA_KEY); |
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if ($subscriptionKey !== $this->key) { |
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throw new EnvelopeNotAcceptable( |
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"Subscription '{$this->key}' inadvertently received Envelope ". |
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"'{$envelope->getUuid()->toString()}' for subscription '$subscriptionKey'.", |
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EnvelopeNotAcceptable::SUBSCRIPTION_KEY_UNEXPECTED |
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); |
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} |
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} |
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} |
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daikon-cqrs /
message-bus
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