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
}