func newPool(server, password string) *redis.Pool {     return &redis.Pool{         MaxIdle: 3,         IdleTimeout: 240 * time.Second,         Dial: func () (redis.Conn, error) {             c, err := redis.Dial("tcp", server)             if err != nil {                 return nil, err             }             if _, err := c.Do("AUTH", password); err != nil {                 c.Close()                 return nil, err             }             return c, err         },         TestOnBorrow: func(c redis.Conn, t time.Time) error {             _, err := c.Do("PING")             return err         },     } } var (     pool *redis.Pool     redisServer = flag.String("redisServer", ":6379", "")     redisPassword = flag.String("redisPassword", "", "") )   func main() {     flag.Parse()     pool = newPool(*redisServer, *redisPassword)     ... }