[#305] Support checking if accessbox was removed

Signed-off-by: Denis Kirillov <d.kirillov@yadro.com>

api/cache/accessbox.go

@@ -24,6 +24,11 @@ type (
 		Lifetime time.Duration
 		Logger   *zap.Logger
 	}
+
+	AccessBoxCacheValue struct {
+		Box     *accessbox.Box
+		PutTime time.Time
+	}
 )
 
 const (
@@ -42,21 +47,21 @@ func DefaultAccessBoxConfig(logger *zap.Logger) *Config {
 	}
 }
 
-// NewAccessBoxCache creates an object of BucketCache.
+// NewAccessBoxCache creates an object of AccessBoxCache.
 func NewAccessBoxCache(config *Config) *AccessBoxCache {
 	gc := gcache.New(config.Size).LRU().Expiration(config.Lifetime).Build()
 
 	return &AccessBoxCache{cache: gc, logger: config.Logger}
 }
 
-// Get returns a cached object.
-func (o *AccessBoxCache) Get(address oid.Address) *accessbox.Box {
+// Get returns a cached accessbox.
+func (o *AccessBoxCache) Get(address oid.Address) *AccessBoxCacheValue {
 	entry, err := o.cache.Get(address)
 	if err != nil {
 		return nil
 	}
 
-	result, ok := entry.(*accessbox.Box)
+	result, ok := entry.(*AccessBoxCacheValue)
 	if !ok {
 		o.logger.Warn(logs.InvalidCacheEntryType, zap.String("actual", fmt.Sprintf("%T", entry)),
 			zap.String("expected", fmt.Sprintf("%T", result)))
@@ -66,7 +71,16 @@ func (o *AccessBoxCache) Get(address oid.Address) *accessbox.Box {
 	return result
 }
 
-// Put stores an object to cache.
+// Put stores an accessbox to cache.
 func (o *AccessBoxCache) Put(address oid.Address, box *accessbox.Box) error {
-	return o.cache.Set(address, box)
+	val := &AccessBoxCacheValue{
+		Box:     box,
+		PutTime: time.Now(),
+	}
+	return o.cache.Set(address, val)
+}
+
+// Delete removes an accessbox from cache.
+func (o *AccessBoxCache) Delete(address oid.Address) {
+	o.cache.Remove(address)
 }