Merge pull request #398 from libp2p/feat/no-default-listen

add options for disabling the default listen address/transports

libp2p_test.go

@@ -9,6 +9,7 @@ import (
 
 	crypto "github.com/libp2p/go-libp2p-crypto"
 	host "github.com/libp2p/go-libp2p-host"
+	pstore "github.com/libp2p/go-libp2p-peerstore"
 	"github.com/libp2p/go-tcp-transport"
 )
 
@@ -32,6 +33,41 @@ func TestBadTransportConstructor(t *testing.T) {
 	}
 }
 
+func TestNoListenAddrs(t *testing.T) {
+	ctx := context.Background()
+	h, err := New(ctx, NoListenAddrs)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer h.Close()
+	if len(h.Addrs()) != 0 {
+		t.Fatal("expected no addresses")
+	}
+}
+
+func TestNoTransports(t *testing.T) {
+	ctx := context.Background()
+	a, err := New(ctx, NoTransports)
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer a.Close()
+
+	b, err := New(ctx, ListenAddrStrings("/ip4/127.0.0.1/tcp/0"))
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer b.Close()
+
+	err = a.Connect(ctx, pstore.PeerInfo{
+		ID:    b.ID(),
+		Addrs: b.Addrs(),
+	})
+	if err == nil {
+		t.Error("dial should have failed as no transports have been configured")
+	}
+}
+
 func TestInsecure(t *testing.T) {
 	ctx := context.Background()
 	h, err := New(ctx, NoSecurity)

options.go

@@ -241,3 +241,21 @@ func NATManager(nm config.NATManagerC) Option {
 		return nil
 	}
 }
+
+// NoListenAddrs will configure libp2p to not listen by default.
+//
+// This will both clear any configured listen addrs and prevent libp2p from
+// applying the default listen address option.
+var NoListenAddrs = func(cfg *Config) error {
+	cfg.ListenAddrs = []ma.Multiaddr{}
+	return nil
+}
+
+// NoTransports will configure libp2p to not enable any transports.
+//
+// This will both clear any configured transports (specified in prior libp2p
+// options) and prevent libp2p from applying the default transports.
+var NoTransports = func(cfg *Config) error {
+	cfg.Transports = []config.TptC{}
+	return nil
+}