Example #1
0
File: dial.go Project: rht/ipget
func reuseDial(dialer net.Dialer, laddr, raddr ma.Multiaddr) (conn net.Conn, retry bool, err error) {
	if laddr == nil {
		// if we're given no local address no sense in using reuseport to dial, dial out as usual.
		return nil, true, reuseport.ErrReuseFailed
	}

	// give reuse.Dialer the manet.Dialer's Dialer.
	// (wow, Dialer should've so been an interface...)
	rd := reuseport.Dialer{dialer}

	// get the local net.Addr manually
	rd.D.LocalAddr, err = manet.ToNetAddr(laddr)
	if err != nil {
		return nil, true, err // something wrong with laddr. retry without.
	}

	// get the raddr dial args for rd.dial
	network, netraddr, err := manet.DialArgs(raddr)
	if err != nil {
		return nil, true, err // something wrong with laddr. retry without.
	}

	// rd.Dial gets us a net.Conn with SO_REUSEPORT and SO_REUSEADDR set.
	conn, err = rd.Dial(network, netraddr)
	return conn, reuseErrShouldRetry(err), err // hey! it worked!
}
Example #2
0
File: main.go Project: rht/ipget
func main() {

	l1, err := reuse.Listen("tcp", "0.0.0.0:11111")
	maybeDie(err)
	fmt.Printf("listening on %s\n", l1.Addr())

	l2, err := reuse.Listen("tcp", "0.0.0.0:22222")
	maybeDie(err)
	fmt.Printf("listening on %s\n", l2.Addr())

	a1, err := resolve.ResolveAddr("dial", "tcp", "127.0.0.1:11111")
	maybeDie(err)

	a3, err := resolve.ResolveAddr("dial", "tcp", "127.0.0.1:33333")
	maybeDie(err)

	d1 := reuse.Dialer{net.Dialer{LocalAddr: a1}}
	d2 := reuse.Dialer{net.Dialer{LocalAddr: a3}}

	go func() {
		l2to1foo, err := l2.Accept()
		maybeDie(err)
		fmt.Printf("%s accepted conn from %s\n", addrStr(l2.Addr()), addrStr(l2to1foo.RemoteAddr()))

		fmt.Println("safe")

		l1to2bar, err := l1.Accept()
		maybeDie(err)
		fmt.Printf("%s accepted conn from %s\n", addrStr(l1.Addr()), addrStr(l1to2bar.RemoteAddr()))

		io.Copy(l1to2bar, l2to1foo)
	}()

	d1to2foo, err := d1.Dial("tcp4", "127.0.0.1:22222")
	maybeDie(err)
	fmt.Printf("dialing from %s to %s\n", d1.D.LocalAddr, "127.0.0.1:22222")

	d2to1bar, err := d2.Dial("tcp4", "127.0.0.1:11111")
	maybeDie(err)
	fmt.Printf("dialing from %s to %s\n", d2.D.LocalAddr, "127.0.0.1:11111")

	go io.Copy(d1to2foo, os.Stdin)
	io.Copy(os.Stdout, d2to1bar)
}