Redis Sorted Set Sample(LastSignin)

main.go

package main

import (
	"fmt"
	"time"

	"github.com/m4rw3r/uuid"
	"gopkg.in/redis.v2"
)

var client = redis.NewTCPClient(&redis.Options{Addr: "127.0.0.1:6379"})
var Location, _ = time.LoadLocation("Asia/Tokyo")

const LastSigninKey = "USER:LASTSIGNIN"


▽
type UserLastSignin struct {

▽

	lastSignedin time.Time
}

type User struct {
	Id string
	UserLastSignin
}

func (u *User) LastSignedin() time.Time {
	if u.lastSignedin.IsZero() {
		result := client.ZScore(LastSigninKey, u.Id)
		return time.Unix(int64(result.Val()), 0).In(Location)
	} else {
		return u.lastSignedin
	}
}

func (u *User) Touch() error {
	now := time.Now()
	u.lastSignedin = now.In(Location)
	result := client.ZAdd(LastSigninKey, redis.Z{Member: u.Id, Score: float64(now.Unix())})
	return result.Err()
}

func main() {
	var ids []string
	for i := 0; i < 10; i++ {
		id, _ := uuid.V4()
		ids = append(ids, id.String())
		u := User{Id: id.String()}
		time.Sleep(time.Second)
		u.Touch()
	}

	for _, id := range ids {
		u := User{Id: id}
		fmt.Println(u.Id, u.LastSignedin())
	}
}