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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; |
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use Closure; |
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use Daikon\MessageBus\EnvelopeInterface; |
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use Daikon\MessageBus\MessageBusInterface; |
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use Daikon\MessageBus\Channel\Subscription\SubscriptionInterface; |
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use Daikon\MessageBus\Channel\Subscription\SubscriptionMap; |
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use Daikon\MessageBus\Exception\EnvelopeNotAcceptable; |
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use Daikon\MessageBus\Exception\SubscriptionUnknown; |
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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 Channel implements ChannelInterface |
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{ |
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private string $key; |
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private SubscriptionMap $subscriptions; |
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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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SubscriptionMap $subscriptions, |
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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->subscriptions = $subscriptions; |
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$this->guard = $guard ?? fn(): bool => true; |
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$metadataEnrichers = $metadataEnrichers ?? new MetadataEnricherList; |
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$this->metadataEnrichers = $metadataEnrichers->enrichWith(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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foreach ($this->subscriptions as $subscription) { |
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$subscription->publish($envelope, $messageBus); |
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} |
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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($envelope); |
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$subscriptionKey = (string)$envelope->getMetadata()->get(SubscriptionInterface::METADATA_KEY); |
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if (!$this->subscriptions->has($subscriptionKey)) { |
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throw new SubscriptionUnknown( |
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"Channel '{$this->key}' has no subscription '$subscriptionKey' and thus ". |
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"Envelope '{$envelope->getUuid()->toString()}' cannot be handled." |
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); |
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} |
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/** @var SubscriptionInterface $subscription */ |
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$subscription = $this->subscriptions->get($subscriptionKey); |
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$subscription->receive($envelope); |
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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 $envelope): bool |
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{ |
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return (bool)($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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"Channel key '".self::METADATA_KEY."' missing in metadata of Envelope ". |
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"'{$envelope->getUuid()->toString()}' received on channel '{$this->key}'.", |
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EnvelopeNotAcceptable::CHANNEL_KEY_MISSING |
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); |
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} |
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$channelKey = $metadata->get(self::METADATA_KEY); |
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if ($channelKey !== $this->key) { |
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throw new EnvelopeNotAcceptable( |
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"Channel '{$this->key}' inadvertently received Envelope ". |
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"'{$envelope->getUuid()->toString()}' for channel '$channelKey'.", |
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EnvelopeNotAcceptable::CHANNEL_KEY_UNEXPECTED |
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); |
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} |
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if (!$metadata->has(SubscriptionInterface::METADATA_KEY)) { |
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throw new EnvelopeNotAcceptable( |
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"Subscription key '".SubscriptionInterface::METADATA_KEY."' missing in metadata of ". |
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"Envelope '{$envelope->getUuid()->toString()}' received on channel '{$this->key}'.", |
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EnvelopeNotAcceptable::SUBSCRIPTION_KEY_MISSING |
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); |
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} |
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} |
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} |
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daikon-cqrs /
message-bus
