func NewStream(w io.Writer, r io.Reader) *stream {
s := &stream{
Reader: r,
Writer: w,
toDeliver: make(chan *transportObject),
}
s.proc = process.WithTeardown(s.teardown)
s.proc.Go(s.transport)
return s
}
func newConn(ln, rn *peernet, l *link) *conn {
c := &conn{net: ln, link: l}
c.local = ln.peer
c.remote = rn.peer
c.localAddr = ln.ps.Addrs(ln.peer)[0]
c.remoteAddr = rn.ps.Addrs(rn.peer)[0]
c.localPrivKey = ln.ps.PrivKey(ln.peer)
c.remotePubKey = rn.ps.PubKey(rn.peer)
c.proc = process.WithTeardown(c.teardown)
return c
}
// NewMapping attemps to construct a mapping on protocol and internal port
// It will also periodically renew the mapping until the returned Mapping
// -- or its parent NAT -- is Closed.
//
// May not succeed, and mappings may change over time;
// NAT devices may not respect our port requests, and even lie.
// Clients should not store the mapped results, but rather always
// poll our object for the latest mappings.
func (nat *NAT) NewMapping(maddr ma.Multiaddr) (Mapping, error) {
if nat == nil {
return nil, fmt.Errorf("no nat available")
}
network, addr, err := manet.DialArgs(maddr)
if err != nil {
return nil, fmt.Errorf("DialArgs failed on addr:", maddr.String())
}
switch network {
case "tcp", "tcp4", "tcp6":
network = "tcp"
case "udp", "udp4", "udp6":
network = "udp"
default:
return nil, fmt.Errorf("transport not supported by NAT: %s", network)
}
intports := strings.Split(addr, ":")[1]
intport, err := strconv.Atoi(intports)
if err != nil {
return nil, err
}
m := &mapping{
nat: nat,
proto: network,
intport: intport,
intaddr: maddr,
}
m.proc = goprocess.WithTeardown(func() error {
nat.rmMapping(m)
return nil
})
nat.addMapping(m)
m.proc.AddChild(periodic.Every(MappingDuration/3, func(worker goprocess.Process) {
nat.establishMapping(m)
}))
// do it once synchronously, so first mapping is done right away, and before exiting,
// allowing users -- in the optimistic case -- to use results right after.
nat.establishMapping(m)
return m, nil
}
// New constructs and sets up a new *BasicHost with given Network
func New(net inet.Network, opts ...interface{}) *BasicHost {
h := &BasicHost{
network: net,
mux: msmux.NewMultistreamMuxer(),
bwc: metrics.NewBandwidthCounter(),
}
h.proc = goprocess.WithTeardown(func() error {
if h.natmgr != nil {
h.natmgr.Close()
}
return h.Network().Close()
})
// setup host services
h.ids = identify.NewIDService(h)
muxh := h.Mux().Handle
handle := func(s inet.Stream) {
muxh(s)
}
h.relay = relay.NewRelayService(h, handle)
for _, o := range opts {
switch o := o.(type) {
case Option:
switch o {
case NATPortMap:
h.natmgr = newNatManager(h)
}
case metrics.Reporter:
h.bwc = o
}
}
net.SetConnHandler(h.newConnHandler)
net.SetStreamHandler(h.newStreamHandler)
return h
}
func newNatManager(host *BasicHost) *natManager {
nmgr := &natManager{
host: host,
ready: make(chan struct{}),
proc: goprocess.WithParent(host.proc),
}
// teardown
nmgr.proc = goprocess.WithTeardown(func() error {
// on closing, unregister from network notifications.
host.Network().StopNotify((*nmgrNetNotifiee)(nmgr))
return nil
})
// host is our parent. close when host closes.
host.proc.AddChild(nmgr.proc)
// discover the nat.
nmgr.discoverNAT()
return nmgr
}
// WithContextAndTeardown is a helper function to set teardown at initiation
// of WithContext
func WithContextAndTeardown(ctx context.Context, tf goprocess.TeardownFunc) goprocess.Process {
p := goprocess.WithTeardown(tf)
CloseAfterContext(p, ctx)
return p
}