InvalidateVarnishObserver.php

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<?php
namespace Magento\CacheInvalidate\Observer;

use Magento\Framework\Event\ObserverInterface;

class InvalidateVarnishObserver implements ObserverInterface
{
    protected $config;

    protected $purgeCache;

    private $tagResolver;

    public function __construct(
        \Magento\PageCache\Model\Config $config,
        \Magento\CacheInvalidate\Model\PurgeCache $purgeCache
    ) {
        $this->config = $config;
        $this->purgeCache = $purgeCache;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $object = $observer->getEvent()->getObject();
        if (!is_object($object)) {
            return;
        }
        if ($this->config->getType() == \Magento\PageCache\Model\Config::VARNISH && $this->config->isEnabled()) {
            $bareTags = $this->getTagResolver()->getTags($object);

            $tags = [];
            $pattern = "((^|,)%s(,|$))";
            foreach ($bareTags as $tag) {
                $tags[] = sprintf($pattern, $tag);
            }
            if (!empty($tags)) {
                $this->purgeCache->sendPurgeRequest(implode('|', array_unique($tags)));
            }
        }
    }

    private function getTagResolver()
    {
        if ($this->tagResolver === null) {
            $this->tagResolver = \Magento\Framework\App\ObjectManager::getInstance()
                ->get(\Magento\Framework\App\Cache\Tag\Resolver::class);
        }
        return $this->tagResolver;
    }
}