add incrementing counter in goroutine

Signed-off-by: Jakub Sokołowski <jakub@status.im>

main.go

@@ -4,12 +4,16 @@ import (
 	"fmt"
 	"github.com/jroimartin/gocui"
 	"log"
+	"time"
 )
 
 type rcpResp map[string]interface{}
 
 const host = "127.0.0.1"
 const port = 8545
+const interval = 3
+
+var threadDone = make(chan struct{})
 
 func main() {
 	g, err := gocui.NewGui(gocui.OutputNormal)
@@ -20,27 +24,73 @@ func main() {
 
 	g.SetManagerFunc(layout)
 
-	if err := g.SetKeybinding("", gocui.KeyCtrlC, gocui.ModNone, quit); err != nil {
+	if err := keybindings(g); err != nil {
 		log.Panicln(err)
 	}
 
+	url := fmt.Sprintf("http://%s:%d", host, port)
+	c, err := newClient(url)
+	if err != nil {
+		log.Panicln(err)
+	}
+
+	// Start RPC calling routine
+	go fetchPeers(c, g)
+
 	if err := g.MainLoop(); err != nil && err != gocui.ErrQuit {
 		log.Panicln(err)
 	}
 }
 
+func fetchPeers(c *client, g *gocui.Gui) {
+	for {
+		select {
+		case <-threadDone:
+			return
+		case <-time.After(interval * time.Second):
+			peers, err := c.getPeers()
+			if err != nil {
+				log.Panicln(err)
+			}
+			writePeers(g, peers)
+		}
+	}
+}
+
+var idx int
+
+func writePeers(g *gocui.Gui, peers interface{}) {
+	g.Update(func(g *gocui.Gui) error {
+		v, err := g.View("main")
+		if err != nil {
+			return err
+		}
+		v.Clear()
+		idx++
+		fmt.Fprintf(v, "idx: %v\n", idx)
+		return nil
+	})
+}
+
+func keybindings(g *gocui.Gui) error {
+	if err := g.SetKeybinding("", gocui.KeyCtrlC, gocui.ModNone, quit); err != nil {
+		return err
+	}
+	return nil
+}
+
 func layout(g *gocui.Gui) error {
 	maxX, maxY := g.Size()
-	if v, err := g.SetView("hello", 0, 0, maxX-1, maxY-1); err != nil {
+	if v, err := g.SetView("main", 0, 0, maxX-1, maxY-1); err != nil {
 		if err != gocui.ErrUnknownView {
 			return err
 		}
-		fmt.Fprintln(v, "Hello world!")
-		fmt.Fprintln(v, "Hello world!")
+		fmt.Fprintln(v, "Loading peers...")
 	}
 	return nil
 }
 
 func quit(g *gocui.Gui, v *gocui.View) error {
+	close(threadDone)
 	return gocui.ErrQuit
 }