90 lines
2.8 KiB
Go
90 lines
2.8 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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// notificationUnreadTTL 未读数 key 的过期时间，避免长期驻留与 MySQL 弱一致漂移。
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const notificationUnreadTTL = 7 * 24 * time.Hour
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// notificationUnreadIncrScript 首次自增时设置过期时间，保证 INCR 与 EXPIRE 原子执行。
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var notificationUnreadIncrScript = redis.NewScript(`
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local v = redis.call('INCR', KEYS[1])
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if v == 1 then
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redis.call('EXPIRE', KEYS[1], ARGV[1])
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end
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return v
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`)
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// notificationUnreadDecrScript 未读数 -1，保证结果不低于 0
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var notificationUnreadDecrScript = redis.NewScript(`
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local v = redis.call('GET', KEYS[1])
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if v and tonumber(v) > 0 then
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return redis.call('DECRBY', KEYS[1], 1)
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end
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return 0
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`)
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// NotificationUnreadIncr 用户未读消息数 +1，返回最新值
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func NotificationUnreadIncr(ctx context.Context, userID int64) (int64, error) {
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ctx, span := global.Tracer.Start(ctx, "redisdao.NotificationUnreadIncr")
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defer span.End()
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key := fmt.Sprintf(redismodel.KeyNotificationUnread, userID)
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val, err := notificationUnreadIncrScript.Run(ctx, global.RedisEngine, []string{key}, int(notificationUnreadTTL.Seconds())).Int64()
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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 val, nil
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}
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// NotificationUnreadDecr 用户未读消息数 -1，返回扣减后的值（不低于 0）
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func NotificationUnreadDecr(ctx context.Context, userID int64) (int64, error) {
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ctx, span := global.Tracer.Start(ctx, "redisdao.NotificationUnreadDecr")
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defer span.End()
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key := fmt.Sprintf(redismodel.KeyNotificationUnread, userID)
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val, err := notificationUnreadDecrScript.Run(ctx, global.RedisEngine, []string{key}).Int64()
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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 val, nil
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}
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// NotificationUnreadGet 获取用户未读消息数，不存在时返回 0
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func NotificationUnreadGet(ctx context.Context, userID int64) (int64, error) {
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ctx, span := global.Tracer.Start(ctx, "redisdao.NotificationUnreadGet")
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defer span.End()
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key := fmt.Sprintf(redismodel.KeyNotificationUnread, userID)
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v, err := global.RedisEngine.Get(ctx, key).Int64()
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if err == redis.Nil {
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return 0, nil
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}
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if err != nil {
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span.RecordError(err)
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}
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return v, err
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}
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// NotificationUnreadSet 回填未读数缓存（DB 对账回源后使用），避免 key 过期导致后续扣减被吞。
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func NotificationUnreadSet(ctx context.Context, userID int64, cnt int64) error {
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ctx, span := global.Tracer.Start(ctx, "redisdao.NotificationUnreadSet")
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defer span.End()
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key := fmt.Sprintf(redismodel.KeyNotificationUnread, userID)
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if err := global.RedisEngine.Set(ctx, key, cnt, notificationUnreadTTL).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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