How to set and get session in magento2.2.3?

Question

I have used below code to set the session in Observer file:

namespace VendorName\ModueleName\Observer;

use Magento\Framework\Event\ObserverInterface;

class ClassName implements ObserverInterface
{
    protected $customerSession;

    public function __construct(
        \Magento\Customer\Model\Session $customerSession
    ){
        $this->customerSession = $customerSession;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $this->customerSession->setIpAddress($_SERVER['REMOTE_ADDR']);
    }
}

I want to access this session at app/code/Magento/Tax/Model/Sales/Total/Quote/Tax.php fetch() action.

I use the below code:

protected $customerSession;

public function __construct(
        \Magento\Customer\Model\Session $customerSession
    ){
        $this->customerSession = $customerSession;
    }

$this->customerSession->getIpAddress();

Please help.

Answer 1

This don't work ? If not, then maybe the event has not happened yet.

protected $customerSession;

public function __construct(
        \Magento\Customer\Model\Session $customerSession
    ){
        $this->customerSession = $customerSession;
    }

public function getValueFromObserver()
{
   return $this->customerSession->getIpAddress();
}