refactor event systems

event/stdin.go

@@ -0,0 +1,51 @@
+package event
+
+import (
+	"bufio"
+	"context"
+	"os"
+)
+
+type Stdin struct {
+	Val string
+}
+
+type StdinHandler struct {
+	*Loop
+	stdInChan chan Stdin
+	ctx       context.Context
+	cancel    context.CancelFunc
+}
+
+func (s *StdinHandler) OnTick(_ Tick) (err error) {
+	select {
+	case stdin := <-s.stdInChan:
+		err = s.Fire(Stdin{stdin.Val})
+	default:
+
+	}
+	return
+}
+
+func (s *StdinHandler) ScanJob() {
+	scanner := bufio.NewScanner(os.Stdin)
+	for scanner.Scan() {
+		select {
+		case <-s.ctx.Done():
+			return
+		default:
+			s.stdInChan <- Stdin{scanner.Text()}
+		}
+	}
+}
+func (s *StdinHandler) OnStart(_ Start) (err error) {
+	s.stdInChan = make(chan Stdin)
+	s.ctx, s.cancel = context.WithCancel(context.Background())
+	go s.ScanJob()
+	return
+}
+
+func (s *StdinHandler) OnClose(_ Close) (err error) {
+	s.cancel()
+	return
+}