code: func (p *Pool) addToPoolSet() error {
  	conn := redisPool.Get()
  	defer conn.Close()
  	p.RLock()
  	thisId := p.id
  	p.RUnlock()
  	if _, err := conn.Do("SADD", Keys.ActivePools, thisId); err != nil {
  		return err
  	}
  	return nil
  }
docs: // addToPoolSet adds the id of the worker pool to a set of active pools
  // in the database.