Storage 和redis 有什么关系啊，我的redis 是nil
log.Printf("connect to redis (addr: %s password: %s db: %d)", addr, passwd, db)
r := NewRedisCli(addr, passwd, db)
return &Env{S: r}type Storage interface {
Shorten(url string, exp int64) (string, error)
ShortlinkInfo(eid string) (interface{}, error)
Unshorten(eid string) (string, error)
}type Env struct {
S Storage
}
