<?php

namespace src\Integration;

class DataProvider
{
    private $host;
    private $user;
    private $password;

    /**
     * @param $host
     * @param $user
     * @param $password
     */
    public function __construct($host, $user, $password)
    {
        $this->host = $host;
        $this->user = $user;
        $this->password = $password;
    }

    /**
     * @param array $request
     *
     * @return array
     */
    public function get(array $request)
    {
        // returns a response from external service
    }
}

?>

<?php

namespace src\Decorator;

use DateTime;
use Exception;
use Psr\Cache\CacheItemPoolInterface;
use Psr\Log\LoggerInterface;
use src\Integration\DataProvider;

class DecoratorManager extends DataProvider
{
    private $cache;
    private $logger;

    /**
     * @param string $host
     * @param string $user
     * @param string $password
     * @param CacheItemPoolInterface $cache
     */
    public function __construct($host, $user, $password, CacheItemPoolInterface $cache, LoggerInterface $logger = null)
    {
        parent::__construct($host, $user, $password);
        $this->cache = $cache;

        // Просто дополнительное удобство, что $logger можно сразу передать в конструктор без отдельного вызова setLogger
        // При этом он остается опциональным
        if ($logger instanceof LoggerInterface)
					$this->logger = $logger;
    }

    public function setLogger(LoggerInterface $logger)
    {
        $this->logger = $logger;
    }

    /**
     * {@inheritdoc}
     */
    public function get(array $request)
    {
        try {
            $cacheKey = $this->getCacheKey($request);
            $cacheItem = $this->cache->getItem($cacheKey);
            if ($cacheItem->isHit()) {
                return $cacheItem->get();
            }
        }
        catch (Exception $e) {
						if ($this->logger instanceof LoggerInterface)
							$this->logger->error('Cache error'); // заменил critical на error
        }


        try {
            $result = parent::get($request);
				}
				catch {
					if ($this->logger instanceof LoggerInterface)
							$this->logger->critical('External data source error');

					return [];
				}

				$cacheItem
						->set($result)
						->expiresAt(
								(new DateTime())->modify('+1 day')
						);

				return $result;
    }

    private function getCacheKey(array $request)
    {
        return json_encode($request);
    }
}

?>