releasble user validator

common/signal/close.go

@@ -0,0 +1,29 @@
+package signal
+
+type CancelSignal struct {
+	cancel chan struct{}
+	done   chan struct{}
+}
+
+func NewCloseSignal() *CancelSignal {
+	return &CancelSignal{
+		cancel: make(chan struct{}),
+		done:   make(chan struct{}),
+	}
+}
+
+func (this *CancelSignal) Cancel() {
+	close(this.cancel)
+}
+
+func (this *CancelSignal) WaitForCancel() <-chan struct{} {
+	return this.cancel
+}
+
+func (this *CancelSignal) Done() {
+	close(this.done)
+}
+
+func (this *CancelSignal) WaitForDone() <-chan struct{} {
+	return this.done
+}