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<?php |
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namespace BenTools\MercurePHP\Transport\Redis; |
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use BenTools\MercurePHP\Security\TopicMatcher; |
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use BenTools\MercurePHP\Model\Message; |
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use BenTools\MercurePHP\Transport\TransportInterface; |
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use Clue\React\Redis\Client as AsynchronousClient; |
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use React\Promise\PromiseInterface; |
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use Rize\UriTemplate; |
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use function React\Promise\resolve; |
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/** |
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* The Redis client cannot handle subscribe and publish within the same connection. |
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* It actually needs 2 connections for that purpose. |
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*/ |
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final class RedisTransport implements TransportInterface |
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{ |
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private AsynchronousClient $subscriber; |
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private AsynchronousClient $publisher; |
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public function __construct(AsynchronousClient $subscriber, AsynchronousClient $publisher) |
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{ |
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$this->subscriber = $subscriber; |
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$this->publisher = $publisher; |
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} |
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public function publish(string $topic, Message $message): PromiseInterface |
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{ |
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$payload = \json_encode($message, \JSON_THROW_ON_ERROR); |
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/** @phpstan-ignore-next-line */ |
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return $this->publisher |
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->publish($topic, $payload); |
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} |
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public function subscribe(string $topicSelector, callable $callback): PromiseInterface |
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{ |
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// Uri templates |
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if (false !== \strpos($topicSelector, '{')) { |
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return $this->subscribePattern($topicSelector, $callback); |
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} |
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/** @phpstan-ignore-next-line */ |
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$this->subscriber->subscribe($topicSelector); |
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$this->subscriber->on( |
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'message', |
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function (string $topic, string $payload) use ($topicSelector, $callback) { |
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$this->dispatch($topic, $payload, $topicSelector, $callback); |
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} |
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); |
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return resolve($topicSelector); |
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} |
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private function subscribePattern(string $topicSelector, callable $callback): PromiseInterface |
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{ |
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static $uriTemplate; |
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$uriTemplate ??= new UriTemplate(); |
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$keys = \array_keys($uriTemplate->extract($topicSelector, $topicSelector, false)); |
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// Replaces /author/{author}/books/{book} by /author/*/books/* to match Redis' patterns |
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$channel = $uriTemplate->expand( |
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$topicSelector, |
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\array_combine( |
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$keys, |
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\array_fill(0, count($keys), '*') |
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) |
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); |
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$channel = \strtr($channel, ['%2A' => '*']); |
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/** @phpstan-ignore-next-line */ |
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$this->subscriber->psubscribe($channel); |
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$this->subscriber->on( |
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'pmessage', |
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function (string $pattern, string $topic, string $payload) use ($topicSelector, $callback) { |
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$this->dispatch($topic, $payload, $topicSelector, $callback); |
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} |
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); |
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return resolve($topicSelector); |
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} |
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private function dispatch(string $topic, string $payload, string $topicSelector, callable $callback): void |
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{ |
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if (!TopicMatcher::matchesTopicSelectors($topic, [$topicSelector])) { |
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return; |
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} |
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$message = Message::fromArray( |
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\json_decode( |
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$payload, |
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true, |
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512, |
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\JSON_THROW_ON_ERROR |
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) |
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); |
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$callback( |
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$topic, |
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$message |
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); |
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} |
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} |
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bpolaszek /
mercure-php-hub
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