looper skeleton (#40)

cmd/zrokloop/loop.go

@@ -1,13 +1,17 @@
 package main
 
-import "github.com/spf13/cobra"
+import (
+	"github.com/sirupsen/logrus"
+	"github.com/spf13/cobra"
+)
 
 func init() {
 	rootCmd.AddCommand(newRun().cmd)
 }
 
 type run struct {
-	cmd *cobra.Command
+	cmd     *cobra.Command
+	loopers int
 }
 
 func newRun() *run {
@@ -18,8 +22,36 @@ func newRun() *run {
 	}
 	r := &run{cmd: cmd}
 	cmd.Run = r.run
+	cmd.Flags().IntVarP(&r.loopers, "loopers", "l", 1, "Number of current loopers to start")
 	return r
 }
 
 func (r *run) run(_ *cobra.Command, _ []string) {
+	var loopers []*looper
+	for i := 0; i < r.loopers; i++ {
+		l := newLooper(i)
+		loopers = append(loopers, l)
+		go l.run()
+	}
+	for _, l := range loopers {
+		<-l.done
+	}
+}
+
+type looper struct {
+	id   int
+	done chan struct{}
+}
+
+func newLooper(id int) *looper {
+	return &looper{
+		id:   id,
+		done: make(chan struct{}),
+	}
+}
+
+func (l *looper) run() {
+	logrus.Infof("starting #%d", l.id)
+	defer close(l.done)
+	defer logrus.Infof("stopping #%d", l.id)
 }