code: public function getLink()
      {
          if ($this->isConnected() === false) {
              $this->connect();
          }
          if (isset($this->servers['all']) === true) {
              return $this->servers['all']['link'];
          }
          if ($this->transactionLevel >= 1) {
              return $this->servers['write']['link'];
          }
  
          return $this->servers['read']['link'];
      }
docs: Get link.
  
  @return mixed link info