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package autonat | ||
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import ( | ||
"context" | ||
"testing" | ||
"time" | ||
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"github.com/libp2p/go-libp2p-core/event" | ||
"github.com/libp2p/go-libp2p-core/host" | ||
"github.com/libp2p/go-libp2p-core/network" | ||
"github.com/libp2p/go-libp2p-core/peer" | ||
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pb "github.com/libp2p/go-libp2p-autonat/pb" | ||
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bhost "github.com/libp2p/go-libp2p-blankhost" | ||
swarmt "github.com/libp2p/go-libp2p-swarm/testing" | ||
"github.com/libp2p/go-msgio/protoio" | ||
ma "github.com/multiformats/go-multiaddr" | ||
"github.com/stretchr/testify/require" | ||
) | ||
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// these are mock service implementations for testing | ||
func makeAutoNATServicePrivate(t *testing.T) host.Host { | ||
h := bhost.NewBlankHost(swarmt.GenSwarm(t)) | ||
h.SetStreamHandler(AutoNATProto, sayPrivateStreamHandler(t)) | ||
return h | ||
} | ||
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func sayPrivateStreamHandler(t *testing.T) network.StreamHandler { | ||
return func(s network.Stream) { | ||
defer s.Close() | ||
r := protoio.NewDelimitedReader(s, network.MessageSizeMax) | ||
if err := r.ReadMsg(&pb.Message{}); err != nil { | ||
t.Error(err) | ||
return | ||
} | ||
w := protoio.NewDelimitedWriter(s) | ||
res := pb.Message{ | ||
Type: pb.Message_DIAL_RESPONSE.Enum(), | ||
DialResponse: newDialResponseError(pb.Message_E_DIAL_ERROR, "no dialable addresses"), | ||
} | ||
w.WriteMsg(&res) | ||
} | ||
} | ||
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func makeAutoNATServicePublic(t *testing.T) host.Host { | ||
h := bhost.NewBlankHost(swarmt.GenSwarm(t)) | ||
h.SetStreamHandler(AutoNATProto, func(s network.Stream) { | ||
defer s.Close() | ||
r := protoio.NewDelimitedReader(s, network.MessageSizeMax) | ||
if err := r.ReadMsg(&pb.Message{}); err != nil { | ||
t.Error(err) | ||
return | ||
} | ||
w := protoio.NewDelimitedWriter(s) | ||
res := pb.Message{ | ||
Type: pb.Message_DIAL_RESPONSE.Enum(), | ||
DialResponse: newDialResponseOK(s.Conn().RemoteMultiaddr()), | ||
} | ||
w.WriteMsg(&res) | ||
}) | ||
return h | ||
} | ||
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func makeAutoNAT(t *testing.T, ash host.Host) (host.Host, AutoNAT) { | ||
h := bhost.NewBlankHost(swarmt.GenSwarm(t)) | ||
h.Peerstore().AddAddrs(ash.ID(), ash.Addrs(), time.Minute) | ||
h.Peerstore().AddProtocols(ash.ID(), AutoNATProto) | ||
a, _ := New(h, WithSchedule(100*time.Millisecond, time.Second), WithoutStartupDelay()) | ||
a.(*AmbientAutoNAT).config.dialPolicy.allowSelfDials = true | ||
a.(*AmbientAutoNAT).config.throttlePeerPeriod = 100 * time.Millisecond | ||
return h, a | ||
} | ||
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func identifyAsServer(server, recip host.Host) { | ||
recip.Peerstore().AddAddrs(server.ID(), server.Addrs(), time.Minute) | ||
recip.Peerstore().AddProtocols(server.ID(), AutoNATProto) | ||
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} | ||
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func connect(t *testing.T, a, b host.Host) { | ||
pinfo := peer.AddrInfo{ID: a.ID(), Addrs: a.Addrs()} | ||
err := b.Connect(context.Background(), pinfo) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
} | ||
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func expectEvent(t *testing.T, s event.Subscription, expected network.Reachability) { | ||
select { | ||
case e := <-s.Out(): | ||
ev, ok := e.(event.EvtLocalReachabilityChanged) | ||
if !ok || ev.Reachability != expected { | ||
t.Fatal("got wrong event type from the bus") | ||
} | ||
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case <-time.After(100 * time.Millisecond): | ||
t.Fatal("failed to get the reachability event from the bus") | ||
} | ||
} | ||
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// tests | ||
func TestAutoNATPrivate(t *testing.T) { | ||
hs := makeAutoNATServicePrivate(t) | ||
defer hs.Close() | ||
hc, an := makeAutoNAT(t, hs) | ||
defer hc.Close() | ||
defer an.Close() | ||
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// subscribe to AutoNat events | ||
s, err := hc.EventBus().Subscribe(&event.EvtLocalReachabilityChanged{}) | ||
if err != nil { | ||
t.Fatalf("failed to subscribe to event EvtLocalReachabilityChanged, err=%s", err) | ||
} | ||
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status := an.Status() | ||
if status != network.ReachabilityUnknown { | ||
t.Fatalf("unexpected NAT status: %d", status) | ||
} | ||
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connect(t, hs, hc) | ||
require.Eventually(t, | ||
func() bool { return an.Status() == network.ReachabilityPrivate }, | ||
2*time.Second, | ||
25*time.Millisecond, | ||
"expected NAT status to be private", | ||
) | ||
expectEvent(t, s, network.ReachabilityPrivate) | ||
} | ||
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func TestAutoNATPublic(t *testing.T) { | ||
hs := makeAutoNATServicePublic(t) | ||
defer hs.Close() | ||
hc, an := makeAutoNAT(t, hs) | ||
defer hc.Close() | ||
defer an.Close() | ||
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// subscribe to AutoNat events | ||
s, err := hc.EventBus().Subscribe(&event.EvtLocalReachabilityChanged{}) | ||
if err != nil { | ||
t.Fatalf("failed to subscribe to event EvtLocalReachabilityChanged, err=%s", err) | ||
} | ||
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status := an.Status() | ||
if status != network.ReachabilityUnknown { | ||
t.Fatalf("unexpected NAT status: %d", status) | ||
} | ||
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connect(t, hs, hc) | ||
require.Eventually(t, | ||
func() bool { return an.Status() == network.ReachabilityPublic }, | ||
2*time.Second, | ||
25*time.Millisecond, | ||
"expected NAT status to be public", | ||
) | ||
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expectEvent(t, s, network.ReachabilityPublic) | ||
} | ||
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func TestAutoNATPublictoPrivate(t *testing.T) { | ||
hs := makeAutoNATServicePublic(t) | ||
defer hs.Close() | ||
hc, an := makeAutoNAT(t, hs) | ||
defer hc.Close() | ||
defer an.Close() | ||
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// subscribe to AutoNat events | ||
s, err := hc.EventBus().Subscribe(&event.EvtLocalReachabilityChanged{}) | ||
if err != nil { | ||
t.Fatalf("failed to subscribe to event EvtLocalRoutabilityPublic, err=%s", err) | ||
} | ||
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if status := an.Status(); status != network.ReachabilityUnknown { | ||
t.Fatalf("unexpected NAT status: %d", status) | ||
} | ||
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connect(t, hs, hc) | ||
require.Eventually(t, | ||
func() bool { return an.Status() == network.ReachabilityPublic }, | ||
2*time.Second, | ||
25*time.Millisecond, | ||
"expected NAT status to be public", | ||
) | ||
expectEvent(t, s, network.ReachabilityPublic) | ||
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hs.SetStreamHandler(AutoNATProto, sayPrivateStreamHandler(t)) | ||
hps := makeAutoNATServicePrivate(t) | ||
connect(t, hps, hc) | ||
identifyAsServer(hps, hc) | ||
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require.Eventually(t, | ||
func() bool { return an.Status() == network.ReachabilityPrivate }, | ||
2*time.Second, | ||
25*time.Millisecond, | ||
"expected NAT status to be private", | ||
) | ||
expectEvent(t, s, network.ReachabilityPrivate) | ||
} | ||
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func TestAutoNATIncomingEvents(t *testing.T) { | ||
hs := makeAutoNATServicePrivate(t) | ||
defer hs.Close() | ||
hc, ani := makeAutoNAT(t, hs) | ||
defer hc.Close() | ||
defer ani.Close() | ||
an := ani.(*AmbientAutoNAT) | ||
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status := an.Status() | ||
if status != network.ReachabilityUnknown { | ||
t.Fatalf("unexpected NAT status: %d", status) | ||
} | ||
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connect(t, hs, hc) | ||
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em, _ := hc.EventBus().Emitter(&event.EvtPeerIdentificationCompleted{}) | ||
em.Emit(event.EvtPeerIdentificationCompleted{Peer: hs.ID()}) | ||
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time.Sleep(10 * time.Millisecond) | ||
if an.Status() == network.ReachabilityUnknown { | ||
t.Fatalf("Expected probe due to identification of autonat service") | ||
} | ||
} | ||
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func TestAutoNATObservationRecording(t *testing.T) { | ||
hs := makeAutoNATServicePublic(t) | ||
defer hs.Close() | ||
hc, ani := makeAutoNAT(t, hs) | ||
defer hc.Close() | ||
defer ani.Close() | ||
an := ani.(*AmbientAutoNAT) | ||
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s, err := hc.EventBus().Subscribe(&event.EvtLocalReachabilityChanged{}) | ||
if err != nil { | ||
t.Fatalf("failed to subscribe to event EvtLocalRoutabilityPublic, err=%s", err) | ||
} | ||
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// pubic observation without address should be ignored. | ||
an.recordObservation(autoNATResult{network.ReachabilityPublic, nil}) | ||
if an.Status() != network.ReachabilityUnknown { | ||
t.Fatalf("unexpected transition") | ||
} | ||
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select { | ||
case <-s.Out(): | ||
t.Fatal("not expecting a public reachability event") | ||
default: | ||
// expected | ||
} | ||
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addr, _ := ma.NewMultiaddr("/ip4/127.0.0.1/udp/1234") | ||
an.recordObservation(autoNATResult{network.ReachabilityPublic, addr}) | ||
if an.Status() != network.ReachabilityPublic { | ||
t.Fatalf("failed to transition to public.") | ||
} | ||
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expectEvent(t, s, network.ReachabilityPublic) | ||
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// a single recording should have confidence still at 0, and transition to private quickly. | ||
an.recordObservation(autoNATResult{network.ReachabilityPrivate, nil}) | ||
if an.Status() != network.ReachabilityPrivate { | ||
t.Fatalf("failed to transition to private.") | ||
} | ||
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expectEvent(t, s, network.ReachabilityPrivate) | ||
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// stronger public confidence should be harder to undo. | ||
an.recordObservation(autoNATResult{network.ReachabilityPublic, addr}) | ||
an.recordObservation(autoNATResult{network.ReachabilityPublic, addr}) | ||
if an.Status() != network.ReachabilityPublic { | ||
t.Fatalf("failed to transition to public.") | ||
} | ||
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expectEvent(t, s, network.ReachabilityPublic) | ||
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an.recordObservation(autoNATResult{network.ReachabilityPrivate, nil}) | ||
if an.Status() != network.ReachabilityPublic { | ||
t.Fatalf("too-extreme private transition.") | ||
} | ||
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} | ||
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func TestStaticNat(t *testing.T) { | ||
_, cancel := context.WithCancel(context.Background()) | ||
defer cancel() | ||
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h := bhost.NewBlankHost(swarmt.GenSwarm(t)) | ||
defer h.Close() | ||
s, _ := h.EventBus().Subscribe(&event.EvtLocalReachabilityChanged{}) | ||
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nat, err := New(h, WithReachability(network.ReachabilityPrivate)) | ||
if err != nil { | ||
t.Fatal(err) | ||
} | ||
if nat.Status() != network.ReachabilityPrivate { | ||
t.Fatalf("should be private") | ||
} | ||
expectEvent(t, s, network.ReachabilityPrivate) | ||
} |
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