ConsumerListCommand.php

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<?php
namespace Magento\MessageQueue\Console;

use Symfony\Component\Console\Command\Command;
use Magento\Framework\MessageQueue\ConfigInterface as QueueConfig;
use Symfony\Component\Console\Input\InputInterface;
use Symfony\Component\Console\Output\OutputInterface;
use Magento\Framework\MessageQueue\Consumer\ConfigInterface as ConsumerConfig;

class ConsumerListCommand extends Command
{
    const COMMAND_QUEUE_CONSUMERS_LIST = 'queue:consumers:list';

    private $consumerConfig;

    public function __construct(QueueConfig $queueConfig, $name = null)
    {
        parent::__construct($name);
    }

    protected function execute(InputInterface $input, OutputInterface $output)
    {
        $consumers = $this->getConsumers();
        $output->writeln($consumers);
        return \Magento\Framework\Console\Cli::RETURN_SUCCESS;
    }

    protected function configure()
    {
        $this->setName(self::COMMAND_QUEUE_CONSUMERS_LIST);
        $this->setDescription('List of MessageQueue consumers');
        $this->setHelp(
            <<<HELP
This command shows list of MessageQueue consumers.
HELP
        );
        parent::configure();
    }

    private function getConsumers()
    {
        $consumerNames = [];
        foreach ($this->getConsumerConfig()->getConsumers() as $consumer) {
            $consumerNames[] = $consumer->getName();
        }
        return $consumerNames;
    }

    private function getConsumerConfig()
    {
        if ($this->consumerConfig === null) {
            $this->consumerConfig = \Magento\Framework\App\ObjectManager::getInstance()->get(ConsumerConfig::class);
        }
        return $this->consumerConfig;
    }
}