80 lines
2.4 KiB
Go
80 lines
2.4 KiB
Go
package redisdao
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import (
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"context"
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"fmt"
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"time"
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"git.lzcwy.cn/zhengchiliu/zt-closet-backend/global"
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"git.lzcwy.cn/zhengchiliu/zt-closet-backend/internal/redismodel"
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"github.com/redis/go-redis/v9"
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)
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// likeSetTTL 点赞集合 key 的过期时间，避免长期驻留导致与 MySQL 弱一致漂移。
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const likeSetTTL = 7 * 24 * time.Hour
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// LikeAdd 用户点赞（like_type + target_id 分桶，成员为 user_id）
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func LikeAdd(ctx context.Context, likeType int8, targetID, userID int64) error {
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ctx, span := global.Tracer.Start(ctx, "redisdao.LikeAdd")
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defer span.End()
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key := fmt.Sprintf(redismodel.KeyLikeSet, likeType, targetID)
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if err := global.RedisEngine.SAdd(ctx, key, userID).Err(); err != nil {
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span.RecordError(err)
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return err
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}
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// 设置 TTL（best-effort）。
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_ = global.RedisEngine.Expire(ctx, key, likeSetTTL).Err()
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return nil
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}
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// LikeRemove 用户取消点赞
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func LikeRemove(ctx context.Context, likeType int8, targetID, userID int64) error {
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ctx, span := global.Tracer.Start(ctx, "redisdao.LikeRemove")
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defer span.End()
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key := fmt.Sprintf(redismodel.KeyLikeSet, likeType, targetID)
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if err := global.RedisEngine.SRem(ctx, key, userID).Err(); err != nil {
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span.RecordError(err)
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return err
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}
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return nil
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}
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// LikeIsMember 判断用户是否已点赞；集合 key 不存在（缓存过期/冷启动）时返回 redis.Nil，
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// 由调用方回落 MySQL 以区分「未命中」与「确实未点赞」。
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func LikeIsMember(ctx context.Context, likeType int8, targetID, userID int64) (bool, error) {
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ctx, span := global.Tracer.Start(ctx, "redisdao.LikeIsMember")
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defer span.End()
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key := fmt.Sprintf(redismodel.KeyLikeSet, likeType, targetID)
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exists, err := global.RedisEngine.Exists(ctx, key).Result()
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if err != nil {
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span.RecordError(err)
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return false, err
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}
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if exists == 0 {
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return false, redis.Nil
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}
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ok, err := global.RedisEngine.SIsMember(ctx, key, userID).Result()
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if err != nil {
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span.RecordError(err)
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return false, err
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}
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return ok, nil
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}
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// LikeCount 获取点赞总数
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func LikeCount(ctx context.Context, likeType int8, targetID int64) (int64, error) {
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ctx, span := global.Tracer.Start(ctx, "redisdao.LikeCount")
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defer span.End()
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key := fmt.Sprintf(redismodel.KeyLikeSet, likeType, targetID)
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cnt, err := global.RedisEngine.SCard(ctx, key).Result()
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if err != nil {
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span.RecordError(err)
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return 0, err
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}
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return cnt, nil
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}
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