8 "github.com/anacrolix/missinggo"
9 "github.com/anacrolix/missinggo/perf"
10 "github.com/pkg/errors"
13 type Listener interface {
17 type socket interface {
22 func listen(n network, addr string, f firewallCallback) (socket, error) {
25 return listenTcp(n.String(), addr)
27 return listenUtp(n.String(), addr, f)
33 func listenTcp(network, address string) (s socket, err error) {
34 l, err := net.Listen(network, address)
43 type tcpSocket struct {
48 func listenAll(networks []network, getHost func(string) string, port int, f firewallCallback) ([]socket, error) {
49 if len(networks) == 0 {
52 var nahs []networkAndHost
53 for _, n := range networks {
54 nahs = append(nahs, networkAndHost{n, getHost(n.String())})
57 ss, retry, err := listenAllRetry(nahs, port, f)
64 type networkAndHost struct {
69 func listenAllRetry(nahs []networkAndHost, port int, f firewallCallback) (ss []socket, retry bool, err error) {
70 ss = make([]socket, 1, len(nahs))
71 portStr := strconv.FormatInt(int64(port), 10)
72 ss[0], err = listen(nahs[0].Network, net.JoinHostPort(nahs[0].Host, portStr), f)
74 return nil, false, errors.Wrap(err, "first listen")
77 if err != nil || retry {
78 for _, s := range ss {
84 portStr = strconv.FormatInt(int64(missinggo.AddrPort(ss[0].Addr())), 10)
85 for _, nah := range nahs[1:] {
86 s, err := listen(nah.Network, net.JoinHostPort(nah.Host, portStr), f)
89 missinggo.IsAddrInUse(err) && port == 0,
90 errors.Wrap(err, "subsequent listen")
97 type firewallCallback func(net.Addr) bool
99 func listenUtp(network, addr string, fc firewallCallback) (socket, error) {
100 us, err := NewUtpSocket(network, addr, fc)
101 return utpSocketSocket{us, network}, err
104 type utpSocketSocket struct {
109 func (me utpSocketSocket) Dial(ctx context.Context, addr string) (conn net.Conn, err error) {
110 defer perf.ScopeTimerErr(&err)()
111 return me.utpSocket.DialContext(ctx, me.network, addr)