2025-02-19 09:10:12 +08:00

95 lines
2.8 KiB
Go

package rankings
import (
"context"
"fmt"
"github.com/redis/go-redis/v9"
"strconv"
)
// Ranking 排行榜结构体
type Ranking struct {
c *redis.Client
}
const EcpmRankingsListPrefix = "ecpm:rankings:"
// NewRanking 创建一个新的排行榜实例
func NewRanking(c *redis.Client) *Ranking {
return &Ranking{
c: c,
}
}
func GetRankingsCacheKey(appId uint32, t uint32) string {
return fmt.Sprintf("%sappId:%d:type:%d", EcpmRankingsListPrefix, appId, t)
}
// SetList 向排行榜中添加成员及其分数
func (r *Ranking) SetList(ctx context.Context, key string, data ...redis.Z) {
r.c.ZAdd(ctx, key, data...)
}
// GetList 获取排行榜,按照分数从高到低排序
func (r *Ranking) GetList(ctx context.Context, key string, start, stop int64) (data []redis.Z, err error) {
return r.c.ZRevRangeWithScores(ctx, key, start, stop).Result()
}
// GetRank 获取指定成员在排行榜中的排名(排名从 0 开始,分数越高排名越靠前)
func (r *Ranking) GetRank(ctx context.Context, key, member string) (rank int64, err error) {
return r.c.ZRevRank(ctx, key, member).Result()
}
// GetRankAndScore 获取指定成员在排行榜中的排名(排名从 0 开始,分数越高排名越靠前)
func (r *Ranking) GetRankAndScore(ctx context.Context, key, member string) (rank int64, score float64, err error) {
rankScore := r.c.ZRevRankWithScore(ctx, key, member).Val()
return rankScore.Rank, rankScore.Score, nil
}
// GetScore 获取指定成员在排行榜中的分数
func (r *Ranking) GetScore(ctx context.Context, key, member string) (score float64, err error) {
return r.c.ZScore(ctx, key, member).Result()
}
// IncrScore 增加分数
func (r *Ranking) IncrScore(ctx context.Context, key, member string, increment float64) (score float64, err error) {
return r.c.ZIncrBy(ctx, key, increment, member).Result()
}
// Remove 删除排行榜
func (r *Ranking) Remove(ctx context.Context, key string) (err error) {
return r.c.Del(ctx, key).Err()
}
// 使用 Lua 保证原子性操作
var getHigherByScoreScript = redis.NewScript(`
local members = redis.call('ZRANGEBYSCORE', KEYS[1], ARGV[1],'+inf','LIMIT', 0, 1, 'WITHSCORES')
if #members == 0 then return nil end
return members
`)
// AtomicGetHigherUser 获取排行榜的前一名
func (r *Ranking) AtomicGetHigherUser(ctx context.Context, key string, score float64) (userId uint64, scoreRes uint32, err error) {
s, err := getHigherByScoreScript.Run(ctx, r.c, []string{key}, score).Slice()
if err != nil {
return
}
if s == nil {
return
}
if len(s) != 2 {
return 0, 0, fmt.Errorf("redis type error len(s) !=2")
}
userId, err = strconv.ParseUint(s[0].(string), 10, 64)
if err != nil {
return
}
tmp, err := strconv.ParseUint(s[1].(string), 10, 64)
if err != nil {
return
}
return userId, uint32(tmp >> 32), nil
}