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package storage
import (	"errors"	"net/url"	"sync"	"time")
type mValue struct {	data      []byte	expiredAt int64}
func (v mValue) isExpired() bool {	return v.expiredAt > 0 && time.Now().UnixNano() > v.expiredAt}
type mCache struct {	lock       sync.RWMutex	gcInterval time.Duration	gcTimer    *time.Timer	storage    map[string]mValue}
func (mc *mCache) Has(key string) (bool, error) {	mc.lock.RLock()	s, ok := mc.storage[key]	mc.lock.RUnlock()
	if ok && s.isExpired() {		go mc.Delete(key)		return false, nil	}
	return ok, nil}
func (mc *mCache) Get(key string) (value []byte, err error) {	mc.lock.RLock()	s, ok := mc.storage[key]	mc.lock.RUnlock()	if !ok {		err = ErrNotFound		return	}
	if s.isExpired() {		mc.Delete(key)		err = ErrExpired		return	}
	value = s.data	return}
func (mc *mCache) Set(key string, value []byte, ttl time.Duration) error {	mc.lock.Lock()	defer mc.lock.Unlock()
	if ttl > 0 {		mc.storage[key] = mValue{value, time.Now().Add(ttl).UnixNano()}	} else {		mc.storage[key] = mValue{value, 0}	}	return nil}
func (mc *mCache) Delete(key string) error {	mc.lock.Lock()	defer mc.lock.Unlock()
	delete(mc.storage, key)	return nil}
func (mc *mCache) Flush() error {	mc.lock.Lock()	defer mc.lock.Unlock()
	mc.storage = map[string]mValue{}	return nil}
func (mc *mCache) gc() {	mc.gcTimer = time.AfterFunc(mc.gcInterval, mc.gc)
	mc.lock.Lock()	defer mc.lock.Unlock()
	for key, d := range mc.storage {		if d.isExpired() {			delete(mc.storage, key)		}	}}
type mcDriver struct{}
func (mcd *mcDriver) Open(region string, options url.Values) (Cache, error) {	gcInterval, err := parseDurationValue(options.Get("gcInterval"), 30*time.Minute)	if err != nil {		return nil, errors.New("invalid gcInterval value")	}
	mc := &mCache{		storage:    map[string]mValue{},		gcInterval: gcInterval,	}	if gcInterval >= time.Second {		mc.gcTimer = time.AfterFunc(gcInterval, mc.gc)	}	return mc, nil}
func init() {	RegisterCache("memory", &mcDriver{})}