golang net.LookupHost wrapper for timeout's

lookuphost.go

package main

import (
	"net"
	"time"
	"fmt"
	"errors"
)

func main() {
	ipaddr, err := LookupHost("rambler.ru", time.Millisecond * 200)
	fmt.Printf("domain: %s, ipaddr: %v, error: %s\n", "rambler.ru", ipaddr, err)
	
	ipaddr, err = LookupHost("0-0-0.ru", time.Millisecond * 200)
	fmt.Printf("domain: %s, ipaddr: %v, error: %s\n", "rambler.ru", ipaddr, err)
}

func LookupHost(hostname string, timeout time.Duration) ([]string, error) {
	c1 := make(chan []string)
	c2 := make(chan error)

	var ipaddr []string
	var err error

	go func() {
		var ipaddr []string
		ipaddr, err := net.LookupHost(hostname)
		if err != nil {
			c2 <- err
		}

		c1 <- ipaddr
	}()

	select {
	case ipaddr = <-c1:
	case err = <-c2:
	case <-time.After(timeout):
		return ipaddr, errors.New("timeout")
	}

	if err != nil {
		return ipaddr, errors.New("timeout")
	}

	return ipaddr, nil
}

Output

domain: rambler.ru, ipaddr: [81.19.82.9 81.19.82.10 81.19.82.11 81.19.82.8], error: %!s(<nil>)
domain: 0-0-0.ru, ipaddr: [], error: timeout

0-0-0.ru resolve over 3sec, but limit is 0.2s