81 lines
2.3 KiB
Go
81 lines
2.3 KiB
Go
package repository
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import (
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"context"
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"fmt"
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"time"
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"github.com/Wei-Shaw/sub2api/internal/service"
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"github.com/redis/go-redis/v9"
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)
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const timeoutCounterPrefix = "timeout_count:account:"
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// timeoutCounterIncrScript 使用 Lua 脚本原子性地增加计数并返回当前值
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// 如果 key 不存在，则创建并设置过期时间
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var timeoutCounterIncrScript = redis.NewScript(`
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local key = KEYS[1]
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local ttl = tonumber(ARGV[1])
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local count = redis.call('INCR', key)
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if count == 1 then
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redis.call('EXPIRE', key, ttl)
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end
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return count
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`)
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type timeoutCounterCache struct {
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rdb *redis.Client
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}
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// NewTimeoutCounterCache 创建超时计数器缓存实例
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func NewTimeoutCounterCache(rdb *redis.Client) service.TimeoutCounterCache {
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return &timeoutCounterCache{rdb: rdb}
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}
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// IncrementTimeoutCount 增加账户的超时计数，返回当前计数值
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// windowMinutes 是计数窗口时间（分钟），超过此时间计数器会自动重置
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func (c *timeoutCounterCache) IncrementTimeoutCount(ctx context.Context, accountID int64, windowMinutes int) (int64, error) {
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key := fmt.Sprintf("%s%d", timeoutCounterPrefix, accountID)
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ttlSeconds := windowMinutes * 60
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if ttlSeconds < 60 {
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ttlSeconds = 60 // 最小1分钟
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}
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result, err := timeoutCounterIncrScript.Run(ctx, c.rdb, []string{key}, ttlSeconds).Int64()
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if err != nil {
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return 0, fmt.Errorf("increment timeout count: %w", err)
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}
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return result, nil
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}
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// GetTimeoutCount 获取账户当前的超时计数
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func (c *timeoutCounterCache) GetTimeoutCount(ctx context.Context, accountID int64) (int64, error) {
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key := fmt.Sprintf("%s%d", timeoutCounterPrefix, accountID)
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val, err := c.rdb.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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return 0, fmt.Errorf("get timeout count: %w", err)
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}
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return val, nil
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}
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// ResetTimeoutCount 重置账户的超时计数
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func (c *timeoutCounterCache) ResetTimeoutCount(ctx context.Context, accountID int64) error {
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key := fmt.Sprintf("%s%d", timeoutCounterPrefix, accountID)
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return c.rdb.Del(ctx, key).Err()
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}
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// GetTimeoutCountTTL 获取计数器剩余过期时间
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func (c *timeoutCounterCache) GetTimeoutCountTTL(ctx context.Context, accountID int64) (time.Duration, error) {
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key := fmt.Sprintf("%s%d", timeoutCounterPrefix, accountID)
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return c.rdb.TTL(ctx, key).Result()
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}
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