waku-org/go-waku

package dnsdisc

import (
    "context"
    "net"
)

// GetResolver returns a *net.Resolver object using a custom nameserver, or
// the default system resolver if no nameserver is specified
func GetResolver(ctx context.Context, nameserver string) *net.Resolver {
    if nameserver == "" {
        return net.DefaultResolver
    }

    return &net.Resolver{
        PreferGo: true,
        Dial: func(_ context.Context, network, address string) (net.Conn, error) {
            d := net.Dialer{}
            return d.DialContext(ctx, network, net.JoinHostPort(nameserver, "53"))
        },
    }
}