/// <summary>
/// 取得计时时间段api调用次数
/// </summary>
public async Task <long> GetApiRecordCountAsync(string api, Policy policy, string policyKey, string policyValue, DateTime now, int duration)
{
var key = FromatApiRecordKey(api, policy, policyKey, policyValue);
return(await _db.ZCountAsync(key, now.Ticks - TimeSpan.FromSeconds(duration).Ticks, now.Ticks));
}
