package main
import (
 "fmt"
 "time"
 "strings"
 nt "./network"
)
const (
 TO_UPPER = iota + 1
 TO_LOWER
)
const (
 ADDRESS = ":8080"
)
func main() {
 var (
  res = new(nt.Package)
  msg = "Hello, World!"
 )
 go nt.Listen(ADDRESS, handleServer)
 time.Sleep(500 * time.Millisecond)
 // send «Hello, World!»
 // receive «HELLO, WORLD!»
 res = nt.Send(ADDRESS, &nt.Package{
  Option: TO_UPPER,
  Data: msg,
 })
 fmt.Println(res.Data)
 // send «HELLO, WORLD!»
 // receive «hello, world!»
 res = nt.Send(ADDRESS, &nt.Package{
  Option: TO_LOWER,
  Data: res.Data,
 })
 fmt.Println(res.Data)
}
func handleServer(conn nt.Conn, pack *nt.Package) {
 nt.Handle(TO_UPPER, conn, pack, handleToUpper)
 nt.Handle(TO_LOWER, conn, pack, handleToLower)
}
func handleToUpper(pack *nt.Package) string {
 return strings.ToUpper(pack.Data)
}
func handleToLower(pack *nt.Package) string {
 return strings.ToLower(pack.Data)
}