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@@ -1,24 +1,30 @@
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package local
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import (
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+ "github.com/pkg/errors"
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"strings"
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"sync"
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"time"
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)
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+type valueItem struct {
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+ value string
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+ expireStartTime time.Time
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+ expireSec int64
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+ expireDoneChan chan any
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+}
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+
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type Cache struct {
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- namespace string
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- syncMap *sync.Map
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- expireRoutineDoneChannelsMutex *sync.Mutex
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- expireRoutineDoneChannels []chan any
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+ *sync.RWMutex
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+ namespace string
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+ cacheMap map[string]*valueItem
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}
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func New(namespace string) *Cache {
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return &Cache{
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- namespace: namespace,
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- syncMap: new(sync.Map),
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- expireRoutineDoneChannelsMutex: new(sync.Mutex),
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- expireRoutineDoneChannels: make([]chan any, 0),
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+ RWMutex: new(sync.RWMutex),
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+ namespace: namespace,
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+ cacheMap: make(map[string]*valueItem),
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}
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}
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@@ -27,124 +33,194 @@ func Destroy(cache *Cache) {
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return
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}
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- cache.expireRoutineDoneChannelsMutex.Lock()
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+ cache.Lock()
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+ defer cache.Unlock()
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- for _, doneChan := range cache.expireRoutineDoneChannels {
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- doneChan <- nil
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- close(doneChan)
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- doneChan = nil
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+ for _, item := range cache.cacheMap {
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+ if item.expireDoneChan != nil {
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+ item.expireDoneChan <- nil
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+ }
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}
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- cache.expireRoutineDoneChannels = nil
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-
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- cache.expireRoutineDoneChannelsMutex.Unlock()
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-
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- cache.syncMap = nil
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+ cache.cacheMap = nil
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}
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func (cache *Cache) Set(key string, value string, expireSec int64) error {
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- cache.syncMap.Store(cache.key2CacheKey(key), value)
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+ cache.Lock()
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+ defer cache.Unlock()
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+
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+ oldItem, ok := cache.cacheMap[cache.key2CacheKey(key)]
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+ if ok {
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+ cache.stopExpireRoutine(oldItem)
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- if expireSec != 0 {
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- doneChan := make(chan any)
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+ newItem := &valueItem{
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+ value: value,
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+ expireStartTime: time.Now(),
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+ expireSec: expireSec,
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+ }
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- cache.expireRoutineDoneChannelsMutex.Lock()
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+ cache.cacheMap[cache.key2CacheKey(key)] = newItem
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- if cache.expireRoutineDoneChannels != nil {
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- cache.expireRoutineDoneChannels = append(cache.expireRoutineDoneChannels, doneChan)
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+ if expireSec == 0 {
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+ return nil
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}
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- cache.expireRoutineDoneChannelsMutex.Unlock()
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+ cache.startExpireRoutine(key, newItem)
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- go func() {
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- timer := time.NewTimer(time.Second * time.Duration(expireSec))
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+ return nil
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+ }
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- defer func() {
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- timer.Stop()
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+ item := &valueItem{
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+ value: value,
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+ expireStartTime: time.Now(),
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+ expireSec: expireSec,
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+ }
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- cache.expireRoutineDoneChannelsMutex.Lock()
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-
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- if cache.expireRoutineDoneChannels != nil {
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- findIndex := -1
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-
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- for i, savedDoneChan := range cache.expireRoutineDoneChannels {
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- if savedDoneChan == doneChan {
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- findIndex = i
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- close(savedDoneChan)
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- savedDoneChan = nil
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- break
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- }
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- }
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-
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- if findIndex != -1 {
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- cache.expireRoutineDoneChannels =
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- append(cache.expireRoutineDoneChannels[:findIndex], cache.expireRoutineDoneChannels[findIndex+1:]...)
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- }
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- }
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-
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- cache.expireRoutineDoneChannelsMutex.Unlock()
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- }()
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-
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- for {
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- select {
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- case <-timer.C:
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- cache.syncMap.Delete(cache.key2CacheKey(key))
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- return
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- case <-doneChan:
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- return
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- }
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- }
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- }()
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+ cache.cacheMap[cache.key2CacheKey(key)] = item
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+
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+ if item.expireSec != 0 {
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+ cache.startExpireRoutine(key, item)
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}
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return nil
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}
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func (cache *Cache) Get(key string) (string, error) {
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- value, loaded := cache.syncMap.Load(cache.key2CacheKey(key))
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- if !loaded {
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+ cache.RLock()
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+ defer cache.RUnlock()
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+
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+ item, ok := cache.cacheMap[cache.key2CacheKey(key)]
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+ if !ok {
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return "", nil
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}
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- return value.(string), nil
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+ return item.value, nil
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}
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func (cache *Cache) GetMulti(keys []string) (map[string]string, error) {
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+ cache.RLock()
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+ defer cache.RUnlock()
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+
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result := make(map[string]string)
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for _, key := range keys {
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- value, loaded := cache.syncMap.Load(cache.key2CacheKey(key))
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- if !loaded {
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+ item, ok := cache.cacheMap[cache.key2CacheKey(key)]
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+ if !ok {
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result[key] = ""
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}
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- result[key] = value.(string)
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+ result[key] = item.value
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}
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return result, nil
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}
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func (cache *Cache) GetAll() (map[string]string, error) {
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+ cache.RLock()
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+ defer cache.RUnlock()
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+
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result := make(map[string]string)
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- cache.syncMap.Range(func(key any, value any) bool {
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- result[cache.cacheKey2Key(key.(string))] = value.(string)
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- return true
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- })
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+ for key, item := range cache.cacheMap {
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+ result[cache.cacheKey2Key(key)] = item.value
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+ }
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return result, nil
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}
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func (cache *Cache) Delete(key string) error {
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- cache.syncMap.Delete(cache.key2CacheKey(key))
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+ cache.Lock()
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+ defer cache.Unlock()
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+
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+ delete(cache.cacheMap, cache.key2CacheKey(key))
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return nil
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}
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func (cache *Cache) Clear() error {
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- cache.syncMap = new(sync.Map)
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+ cache.Lock()
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+ defer cache.Unlock()
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+
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+ cache.cacheMap = make(map[string]*valueItem)
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+ return nil
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+}
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+
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+func (cache *Cache) Expire(key string, expireSec int64) error {
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+ cache.Lock()
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+ defer cache.Unlock()
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+
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+ oldItem, ok := cache.cacheMap[cache.key2CacheKey(key)]
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+ if !ok {
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+ return errors.New("对应的键不存在: " + key)
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+ }
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+
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+ cache.stopExpireRoutine(oldItem)
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+
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+ newItem := &valueItem{
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+ value: oldItem.value,
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+ expireStartTime: time.Now(),
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+ expireSec: expireSec,
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+ }
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+
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+ cache.cacheMap[cache.key2CacheKey(key)] = newItem
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+
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+ if expireSec == 0 {
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+ return nil
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+ }
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+
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+ cache.startExpireRoutine(key, newItem)
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+
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return nil
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}
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+func (cache *Cache) TTL(key string) (int64, error) {
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+ cache.RLock()
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+ defer cache.RUnlock()
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+
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+ item, ok := cache.cacheMap[cache.key2CacheKey(key)]
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+ if !ok {
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+ return 0, nil
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+ }
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+
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+ remainSec := int64(item.expireStartTime.Add(time.Duration(item.expireSec)*time.Second).Sub(time.Now()).Seconds() + 0.5)
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+ if remainSec <= 0 {
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+ return 0, nil
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+ }
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+
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+ return remainSec, nil
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+}
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+
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+func (cache *Cache) startExpireRoutine(key string, item *valueItem) {
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+ item.expireDoneChan = make(chan any)
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+
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+ go func() {
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+ timer := time.NewTimer(time.Second * time.Duration(item.expireSec))
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+
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+ defer func() {
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+ if item.expireDoneChan != nil {
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+ close(item.expireDoneChan)
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+ item.expireDoneChan = nil
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+ }
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+ }()
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+
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+ for {
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+ select {
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+ case <-timer.C:
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+ delete(cache.cacheMap, cache.key2CacheKey(key))
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+ return
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+ case <-item.expireDoneChan:
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+ timer.Stop()
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+ return
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+ }
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+ }
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+ }()
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+}
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+
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+func (cache *Cache) stopExpireRoutine(item *valueItem) {
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+ if item.expireDoneChan != nil {
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+ item.expireDoneChan <- nil
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+ }
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+}
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+
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func (cache *Cache) key2CacheKey(key string) string {
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return cache.namespace + "::" + key
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}
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