Implementation of 'Rails.cache.fetch' using Stash PHP Library

stash.php

<?php
use Stash\Driver\Redis; 
use Stash\Pool;

class Cache {
  public static function fetch(String $namespace, String $key, $expiresAfter, $callback) {
    $pool = new Pool(new Redis());

    $item = $pool->getItem($namespace . '/' . hash('sha256', $key));
    $data = $item->get();
    
    if($item->isMiss()) {
      $item->lock();
      $data = $callback();
      $item->set($data);
      $item->expiresAt($expiresAfter);
      $pool->save($item);      
    }

    return $data;
  }
}