[#165] Cancel context in outdated list session

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

api/cache/listsession.go

@@ -55,7 +55,9 @@ func NewListSessionCache(config *Config) *ListSessionCache {
 				zap.String("expected", fmt.Sprintf("%T", session)))
 		}
 
-		// todo session.Cancel()
+		if !session.Acquired.Load() {
+			session.Cancel()
+		}
 	}).Build()
 	return &ListSessionCache{cache: gc, logger: config.Logger}
 }
@@ -79,6 +81,12 @@ func (l *ListSessionCache) GetListSession(key ListSessionKey) *data.ListSession
 
 // PutListSession puts a list of object versions to cache.
 func (l *ListSessionCache) PutListSession(key ListSessionKey, session *data.ListSession) error {
+	s := l.GetListSession(key)
+	if s != nil && s != session {
+		if !s.Acquired.Load() {
+			s.Cancel()
+		}
+	}
 	return l.cache.Set(key, session)
 }