package main

import (

	"errors"

	"fmt"

	"time"

)

func RPCClient(ch chan string, req string) (string, error) {

	ch <- req

	select {

	case ack := <-ch:

		return ack, nil

	case <-time.After(time.Second):

		return "", errors.New("Time out")

	}

}

func RPCServer(ch chan string) {

	for {

		data := <-ch

		fmt.Println("server received:", data)

		//time.Sleep(time.Second * 2)

		ch <- "roger"

	}

}

func main() {

	ch := make(chan string)

	go RPCServer(ch)

	recv, err := RPCClient(ch, "hi")

	if err != nil {

		fmt.Println(err)

	} else {

		fmt.Println("client received", recv)

	}

}