// Copyright 2023 GoEdge CDN goedge.cdn@gmail.com. All rights reserved. Official site: https://goedge.cn .

package fsutils

import (
	"github.com/TeaOSLab/EdgeNode/internal/utils/fasttime"
	"sync"
)

var locker = &sync.RWMutex{}
var cacheMap = map[string]*StatResult{} // path => StatResult

const cacheLife = 3 // seconds

// StatDeviceCache stat device with cache
func StatDeviceCache(path string) (*StatResult, error) {
	locker.RLock()
	stat, ok := cacheMap[path]
	if ok && stat.updatedAt >= fasttime.Now().Unix()-cacheLife {
		locker.RUnlock()
		return stat, nil
	}
	locker.RUnlock()

	locker.Lock()
	defer locker.Unlock()

	stat, err := StatDevice(path)
	if err != nil {
		return nil, err
	}

	cacheMap[path] = stat
	return stat, nil
}