Listening to RPC and HTTP simultaneously with golang

server.go

package main

import (
	"errors"
	"io"
	"log"
	"net"
	"net/http"
	"net/rpc"
)

const (
	RPC_PORT  = "9876"
	HTTP_PORT = "8008"
)

func main() {
	err1 := make(chan error)
	err2 := make(chan error)
	go listenRpc(err1)
	go listenHttp(err2)

	select {
	case er := <-err1:
		log.Fatalf("Exited rpc with error: %s", er.Error())
	case er := <-err1:
		log.Fatalf("Exited http with error: %s", er.Error())
	}
}

func listenRpc(err_chan chan error) {
	rpc.Register(NewRPC())

	listener, err := net.Listen("tcp", ":"+RPC_PORT)
	if err != nil {
		err_chan <- err
		return
	}

	log.Printf("Listening for RPC requests on port %s...", RPC_PORT)
	rpc.Accept(listener)
	err_chan <- errors.New("stopped listening for RPC requests")
}

func listenHttp(err_chan chan error) {
	http.HandleFunc("/", hello)
	log.Printf("Listening for HTTP requests on port %s...", HTTP_PORT)
	err_chan <- http.ListenAndServe(":8008", nil)
}

func hello(w http.ResponseWriter, r *http.Request) {
	io.WriteString(w, "Hello world!")
}