added NAT traversal option and constructor test

libp2p.go

@@ -31,6 +31,7 @@ type Config struct {
 	Protector    pnet.Protector
 	Reporter     metrics.Reporter
 	DisableSecio bool
+	EnableNAT    bool
 }
 
 type Option func(cfg *Config) error
@@ -92,6 +93,13 @@ func NoEncryption() Option {
 	return TransportEncryption(EncPlaintext)
 }
 
+func NATPortMap() Option {
+	return func(cfg *Config) error {
+		cfg.EnableNAT = true
+		return nil
+	}
+}
+
 func Muxer(m mux.Transport) Option {
 	return func(cfg *Config) error {
 		if cfg.Muxer != nil {
@@ -199,7 +207,13 @@ func newWithCfg(ctx context.Context, cfg *Config) (host.Host, error) {
 
 	netw := (*swarm.Network)(swrm)
 
-	return bhost.New(netw), nil
+	hostOpts := &bhost.HostOpts{}
+
+	if cfg.EnableNAT {
+		hostOpts.NATManager = bhost.NewNATManager(netw)
+	}
+
+	return bhost.NewHost(ctx, netw, hostOpts)
 }
 
 func DefaultMuxer() mux.Transport {

libp2p_test.go

@@ -0,0 +1,34 @@
+package libp2p
+
+import (
+	"context"
+	"fmt"
+	"testing"
+
+	crypto "github.com/libp2p/go-libp2p-crypto"
+	host "github.com/libp2p/go-libp2p-host"
+)
+
+func TestNewHost(t *testing.T) {
+	_, err := makeRandomHost(t, 9000)
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func makeRandomHost(t *testing.T, port int) (host.Host, error) {
+	ctx := context.Background()
+	priv, _, err := crypto.GenerateKeyPair(crypto.RSA, 2048)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	opts := []Option{
+		ListenAddrStrings(fmt.Sprintf("/ip4/127.0.0.1/tcp/%d", port)),
+		Identity(priv),
+		Muxer(DefaultMuxer()),
+		NATPortMap(),
+	}
+
+	return New(ctx, opts...)
+}