package signal import ( "context" "sync" "time" "github.com/xtls/xray-core/common" "github.com/xtls/xray-core/common/task" ) type ActivityUpdater interface { Update() } type ActivityTimer struct { sync.RWMutex updated chan struct{} checkTask *task.Periodic onTimeout func() } func (t *ActivityTimer) Update() { select { case t.updated <- struct{}{}: default: } } func (t *ActivityTimer) check() error { select { case <-t.updated: default: t.finish() } return nil } func (t *ActivityTimer) finish() { t.Lock() defer t.Unlock() if t.onTimeout != nil { t.onTimeout() t.onTimeout = nil } if t.checkTask != nil { t.checkTask.Close() t.checkTask = nil } } func (t *ActivityTimer) SetTimeout(timeout time.Duration) { if timeout == 0 { t.finish() return } checkTask := &task.Periodic{ Interval: timeout, Execute: t.check, } t.Lock() if t.checkTask != nil { t.checkTask.Close() } t.checkTask = checkTask t.Unlock() t.Update() common.Must(checkTask.Start()) } func CancelAfterInactivity(ctx context.Context, cancel context.CancelFunc, timeout time.Duration) *ActivityTimer { timer := &ActivityTimer{ updated: make(chan struct{}, 1), onTimeout: cancel, } timer.SetTimeout(timeout) return timer }