package swarm import ( "context" "crypto/rand" "errors" "fmt" "math" mrand "math/rand" "reflect" "sort" "sync" "testing" "testing/quick" "time" "github.com/libp2p/go-libp2p/core/crypto" "github.com/libp2p/go-libp2p/core/network" "github.com/libp2p/go-libp2p/core/peer" "github.com/libp2p/go-libp2p/core/peerstore" "github.com/libp2p/go-libp2p/core/sec" "github.com/libp2p/go-libp2p/core/sec/insecure" "github.com/libp2p/go-libp2p/core/test" "github.com/libp2p/go-libp2p/core/transport" "github.com/libp2p/go-libp2p/p2p/host/eventbus" "github.com/libp2p/go-libp2p/p2p/host/peerstore/pstoremem" "github.com/libp2p/go-libp2p/p2p/muxer/yamux" tptu "github.com/libp2p/go-libp2p/p2p/net/upgrader" quic "github.com/libp2p/go-libp2p/p2p/transport/quic" "github.com/libp2p/go-libp2p/p2p/transport/quicreuse" "github.com/libp2p/go-libp2p/p2p/transport/tcp" ma "github.com/multiformats/go-multiaddr" manet "github.com/multiformats/go-multiaddr/net" "github.com/stretchr/testify/require" ) type mockClock struct { *test.MockClock } func (m *mockClock) InstantTimer(when time.Time) InstantTimer { return m.MockClock.InstantTimer(when) } func newMockClock() *mockClock { return &mockClock{test.NewMockClock()} } func newPeer(t *testing.T) (crypto.PrivKey, peer.ID) { priv, _, err := crypto.GenerateEd25519Key(rand.Reader) require.NoError(t, err) id, err := peer.IDFromPrivateKey(priv) require.NoError(t, err) return priv, id } func makeSwarm(t *testing.T) *Swarm { s := makeSwarmWithNoListenAddrs(t, WithDialTimeout(1*time.Second)) if err := s.Listen(ma.StringCast("/ip4/127.0.0.1/tcp/0")); err != nil { t.Fatal(err) } if err := s.Listen(ma.StringCast("/ip4/127.0.0.1/udp/0/quic")); err != nil { t.Fatal(err) } return s } func makeSwarmWithNoListenAddrs(t *testing.T, opts ...Option) *Swarm { priv, id := newPeer(t) ps, err := pstoremem.NewPeerstore() require.NoError(t, err) ps.AddPubKey(id, priv.GetPublic()) ps.AddPrivKey(id, priv) t.Cleanup(func() { ps.Close() }) s, err := NewSwarm(id, ps, eventbus.NewBus(), opts...) require.NoError(t, err) upgrader := makeUpgrader(t, s) var tcpOpts []tcp.Option tcpOpts = append(tcpOpts, tcp.DisableReuseport()) tcpTransport, err := tcp.NewTCPTransport(upgrader, nil, tcpOpts...) require.NoError(t, err) if err := s.AddTransport(tcpTransport); err != nil { t.Fatal(err) } reuse, err := quicreuse.NewConnManager([32]byte{}) if err != nil { t.Fatal(err) } quicTransport, err := quic.NewTransport(priv, reuse, nil, nil, nil) if err != nil { t.Fatal(err) } if err := s.AddTransport(quicTransport); err != nil { t.Fatal(err) } return s } func makeUpgrader(t *testing.T, n *Swarm) transport.Upgrader { id := n.LocalPeer() pk := n.Peerstore().PrivKey(id) st := insecure.NewWithIdentity(insecure.ID, id, pk) u, err := tptu.New([]sec.SecureTransport{st}, []tptu.StreamMuxer{{ID: yamux.ID, Muxer: yamux.DefaultTransport}}, nil, nil, nil) require.NoError(t, err) return u } // makeTCPListener listens on tcp address a. On accepting a connection it notifies recvCh. Sending a message to // channel ch will close an accepted connection func makeTCPListener(t *testing.T, a ma.Multiaddr, recvCh chan struct{}) (list manet.Listener, ch chan struct{}) { t.Helper() list, err := manet.Listen(a) if err != nil { t.Fatal(err) } ch = make(chan struct{}) go func() { for { c, err := list.Accept() if err != nil { break } recvCh <- struct{}{} <-ch err = c.Close() if err != nil { t.Error(err) } } }() return list, ch } func TestDialWorkerLoopBasic(t *testing.T) { s1 := makeSwarm(t) s2 := makeSwarm(t) defer s1.Close() defer s2.Close() // Only pass in a single address here, otherwise we might end up with a TCP and QUIC connection dialed. s1.Peerstore().AddAddrs(s2.LocalPeer(), []ma.Multiaddr{s2.ListenAddresses()[0]}, peerstore.PermanentAddrTTL) reqch := make(chan dialRequest) resch := make(chan dialResponse) worker := newDialWorker(s1, s2.LocalPeer(), reqch, nil) go worker.loop() var conn *Conn reqch <- dialRequest{ctx: context.Background(), resch: resch} select { case res := <-resch: require.NoError(t, res.err) conn = res.conn case <-time.After(10 * time.Second): t.Fatal("dial didn't complete") } s, err := conn.NewStream(context.Background()) require.NoError(t, err) s.Close() var conn2 *Conn reqch <- dialRequest{ctx: context.Background(), resch: resch} select { case res := <-resch: require.NoError(t, res.err) conn2 = res.conn case <-time.After(10 * time.Second): t.Fatal("dial didn't complete") } // can't use require.Equal here, as this does a deep comparison if conn != conn2 { t.Fatalf("expecting the same connection from both dials. %s <-> %s vs. %s <-> %s", conn.LocalMultiaddr(), conn.RemoteMultiaddr(), conn2.LocalMultiaddr(), conn2.RemoteMultiaddr()) } close(reqch) worker.wg.Wait() } func TestDialWorkerLoopConcurrent(t *testing.T) { s1 := makeSwarm(t) s2 := makeSwarm(t) defer s1.Close() defer s2.Close() s1.Peerstore().AddAddrs(s2.LocalPeer(), s2.ListenAddresses(), peerstore.PermanentAddrTTL) reqch := make(chan dialRequest) worker := newDialWorker(s1, s2.LocalPeer(), reqch, nil) go worker.loop() const dials = 100 var wg sync.WaitGroup resch := make(chan dialResponse, dials) for i := 0; i < dials; i++ { wg.Add(1) go func() { defer wg.Done() reschgo := make(chan dialResponse, 1) reqch <- dialRequest{ctx: context.Background(), resch: reschgo} select { case res := <-reschgo: resch <- res case <-time.After(time.Minute): resch <- dialResponse{err: errors.New("timed out!")} } }() } wg.Wait() for i := 0; i < dials; i++ { res := <-resch require.NoError(t, res.err) } t.Log("all concurrent dials done") close(reqch) worker.wg.Wait() } func TestDialWorkerLoopFailure(t *testing.T) { s1 := makeSwarm(t) defer s1.Close() _, p2 := newPeer(t) s1.Peerstore().AddAddrs(p2, []ma.Multiaddr{ma.StringCast("/ip4/11.0.0.1/tcp/1234"), ma.StringCast("/ip4/11.0.0.1/udp/1234/quic")}, peerstore.PermanentAddrTTL) reqch := make(chan dialRequest) resch := make(chan dialResponse) worker := newDialWorker(s1, p2, reqch, nil) go worker.loop() reqch <- dialRequest{ctx: context.Background(), resch: resch} select { case res := <-resch: require.Error(t, res.err) case <-time.After(time.Minute): t.Fatal("dial didn't complete") } close(reqch) worker.wg.Wait() } func TestDialWorkerLoopConcurrentFailure(t *testing.T) { s1 := makeSwarm(t) defer s1.Close() _, p2 := newPeer(t) s1.Peerstore().AddAddrs(p2, []ma.Multiaddr{ma.StringCast("/ip4/11.0.0.1/tcp/1234"), ma.StringCast("/ip4/11.0.0.1/udp/1234/quic")}, peerstore.PermanentAddrTTL) reqch := make(chan dialRequest) worker := newDialWorker(s1, p2, reqch, nil) go worker.loop() const dials = 100 var errTimeout = errors.New("timed out!") var wg sync.WaitGroup resch := make(chan dialResponse, dials) for i := 0; i < dials; i++ { wg.Add(1) go func() { defer wg.Done() reschgo := make(chan dialResponse, 1) reqch <- dialRequest{ctx: context.Background(), resch: reschgo} select { case res := <-reschgo: resch <- res case <-time.After(time.Minute): resch <- dialResponse{err: errTimeout} } }() } wg.Wait() for i := 0; i < dials; i++ { res := <-resch require.Error(t, res.err) if res.err == errTimeout { t.Fatal("dial response timed out") } } t.Log("all concurrent dials done") close(reqch) worker.wg.Wait() } func TestDialWorkerLoopConcurrentMix(t *testing.T) { s1 := makeSwarm(t) s2 := makeSwarm(t) defer s1.Close() defer s2.Close() s1.Peerstore().AddAddrs(s2.LocalPeer(), s2.ListenAddresses(), peerstore.PermanentAddrTTL) s1.Peerstore().AddAddrs(s2.LocalPeer(), []ma.Multiaddr{ma.StringCast("/ip4/11.0.0.1/tcp/1234"), ma.StringCast("/ip4/11.0.0.1/udp/1234/quic")}, peerstore.PermanentAddrTTL) reqch := make(chan dialRequest) worker := newDialWorker(s1, s2.LocalPeer(), reqch, nil) go worker.loop() const dials = 100 var wg sync.WaitGroup resch := make(chan dialResponse, dials) for i := 0; i < dials; i++ { wg.Add(1) go func() { defer wg.Done() reschgo := make(chan dialResponse, 1) reqch <- dialRequest{ctx: context.Background(), resch: reschgo} select { case res := <-reschgo: resch <- res case <-time.After(time.Minute): resch <- dialResponse{err: errors.New("timed out!")} } }() } wg.Wait() for i := 0; i < dials; i++ { res := <-resch require.NoError(t, res.err) } t.Log("all concurrent dials done") close(reqch) worker.wg.Wait() } func TestDialWorkerLoopConcurrentFailureStress(t *testing.T) { s1 := makeSwarm(t) defer s1.Close() _, p2 := newPeer(t) var addrs []ma.Multiaddr for i := 0; i < 16; i++ { addrs = append(addrs, ma.StringCast(fmt.Sprintf("/ip4/11.0.0.%d/tcp/%d", i%256, 1234+i))) } s1.Peerstore().AddAddrs(p2, addrs, peerstore.PermanentAddrTTL) reqch := make(chan dialRequest) worker := newDialWorker(s1, p2, reqch, nil) go worker.loop() const dials = 100 var errTimeout = errors.New("timed out!") var wg sync.WaitGroup resch := make(chan dialResponse, dials) for i := 0; i < dials; i++ { wg.Add(1) go func() { defer wg.Done() reschgo := make(chan dialResponse, 1) reqch <- dialRequest{ctx: context.Background(), resch: reschgo} select { case res := <-reschgo: t.Log("received result") resch <- res case <-time.After(15 * time.Second): resch <- dialResponse{err: errTimeout} } }() } wg.Wait() for i := 0; i < dials; i++ { res := <-resch require.Error(t, res.err) if res.err == errTimeout { t.Fatal("dial response timed out") } } t.Log("all concurrent dials done") close(reqch) worker.wg.Wait() } func TestDialQueueNextBatch(t *testing.T) { addrs := make([]ma.Multiaddr, 0) for i := 0; i < 10; i++ { addrs = append(addrs, ma.StringCast(fmt.Sprintf("/ip4/1.2.3.4/tcp/%d", i))) } testcase := []struct { name string input []network.AddrDelay output [][]ma.Multiaddr }{ { name: "next batch", input: []network.AddrDelay{ {Addr: addrs[0], Delay: 3}, {Addr: addrs[1], Delay: 2}, {Addr: addrs[2], Delay: 1}, {Addr: addrs[3], Delay: 1}, }, output: [][]ma.Multiaddr{ {addrs[2], addrs[3]}, {addrs[1]}, {addrs[0]}, }, }, { name: "priority queue property 2", input: []network.AddrDelay{ {Addr: addrs[0], Delay: 5}, {Addr: addrs[1], Delay: 3}, {Addr: addrs[2], Delay: 2}, {Addr: addrs[3], Delay: 1}, {Addr: addrs[4], Delay: 1}, }, output: [][]ma.Multiaddr{ {addrs[3], addrs[4]}, {addrs[2]}, {addrs[1]}, {addrs[0]}, }, }, { name: "updates", input: []network.AddrDelay{ {Addr: addrs[0], Delay: 3}, // decreasing order {Addr: addrs[1], Delay: 3}, {Addr: addrs[2], Delay: 2}, {Addr: addrs[3], Delay: 2}, {Addr: addrs[4], Delay: 1}, {Addr: addrs[0], Delay: 1}, // increasing order {Addr: addrs[1], Delay: 1}, {Addr: addrs[2], Delay: 2}, {Addr: addrs[3], Delay: 2}, {Addr: addrs[4], Delay: 3}, }, output: [][]ma.Multiaddr{ {addrs[0], addrs[1]}, {addrs[2], addrs[3]}, {addrs[4]}, {}, }, }, { name: "null input", input: []network.AddrDelay{}, output: [][]ma.Multiaddr{ {}, {}, }, }, } for _, tc := range testcase { t.Run(tc.name, func(t *testing.T) { q := newDialQueue() for i := 0; i < len(tc.input); i++ { q.Add(tc.input[i]) } for _, batch := range tc.output { b := q.NextBatch() if len(batch) != len(b) { t.Errorf("expected %d elements got %d", len(batch), len(b)) } sort.Slice(b, func(i, j int) bool { return b[i].Addr.String() < b[j].Addr.String() }) sort.Slice(batch, func(i, j int) bool { return batch[i].String() < batch[j].String() }) for i := 0; i < len(b); i++ { if !b[i].Addr.Equal(batch[i]) { log.Errorf("expected %s got %s", batch[i], b[i].Addr) } } } if q.len() != 0 { t.Errorf("expected queue to be empty at end. got: %d", q.len()) } }) } } // timedDial is a dial to a single address of the peer type timedDial struct { // addr is the address to dial addr ma.Multiaddr // delay is the delay after which this address should be dialed delay time.Duration // success indicates whether the dial should succeed success bool // failAfter is how long this dial should take to fail after it is dialed failAfter time.Duration } // schedulingTestCase is used to test dialWorker loop scheduler logic // a ranker is made according to `input` which provides the addresses to // dial worker loop with the specified delays // checkDialWorkerLoopScheduling then verifies that the different dial calls are // made at the right moments type schedulingTestCase struct { name string input []timedDial maxDuration time.Duration } // schedulingTestCase generates a random test case func (s schedulingTestCase) Generate(rand *mrand.Rand, size int) reflect.Value { if size > 20 { size = 20 } input := make([]timedDial, size) delays := make(map[time.Duration]struct{}) for i := 0; i < size; i++ { input[i] = timedDial{ addr: ma.StringCast(fmt.Sprintf("/ip4/127.0.0.1/tcp/%d", i+10550)), delay: time.Duration(mrand.Intn(100)) * 10 * time.Millisecond, // max 1 second success: false, failAfter: time.Duration(mrand.Intn(100)) * 10 * time.Millisecond, // max 1 second } delays[input[i].delay] = struct{}{} } successIdx := rand.Intn(size) for { // set a unique delay for success. This is required to test the property that // no extra dials are made after success d := time.Duration(rand.Intn(100)) * 10 * time.Millisecond if _, ok := delays[d]; !ok { input[successIdx].delay = d input[successIdx].success = true break } } return reflect.ValueOf(schedulingTestCase{ name: "", input: input, maxDuration: 10 * time.Second, // not tested here }) } // dialState is used to track the dials for testing dialWorker ranking logic type dialState struct { // ch is the chan used to trigger dial failure. ch chan struct{} // addr is the address of the dial addr ma.Multiaddr // delay is the delay after which this address should be dialed delay time.Duration // success indicates whether the dial should succeed success bool // failAfter is how long this dial should take to fail after it is dialed failAfter time.Duration // failAt is the instant at which this dial should fail if success is false failAt time.Time } // checkDialWorkerLoopScheduling verifies whether s1 dials s2 according to the // schedule specified by the test case tc func checkDialWorkerLoopScheduling(t *testing.T, s1, s2 *Swarm, tc schedulingTestCase) error { t.Helper() // failDials is used to track dials which should fail in the future // at appropriate moment a message is sent to dialState.ch to trigger // failure failDials := make(map[ma.Multiaddr]dialState) // recvCh is used to receive dial notifications for dials that will fail recvCh := make(chan struct{}, 100) // allDials tracks all pending dials allDials := make(map[ma.Multiaddr]dialState) // addrs are the peer addresses the swarm will use for dialing addrs := make([]ma.Multiaddr, 0) // create pending dials // we add success cases as a listen address on swarm // failed cases are created using makeTCPListener for _, inp := range tc.input { var failCh chan struct{} if inp.success { // add the address as a listen address if this dial should succeed err := s2.AddListenAddr(inp.addr) if err != nil { return fmt.Errorf("failed to listen on addr: %s: err: %w", inp.addr, err) } } else { // make a listener which will fail on sending a message to ch l, ch := makeTCPListener(t, inp.addr, recvCh) failCh = ch f := func() { err := l.Close() if err != nil { t.Error(err) } } defer f() } addrs = append(addrs, inp.addr) // add to pending dials allDials[inp.addr] = dialState{ ch: failCh, addr: inp.addr, delay: inp.delay, success: inp.success, failAfter: inp.failAfter, } } // setup the peers addresses s1.Peerstore().AddAddrs(s2.LocalPeer(), addrs, peerstore.PermanentAddrTTL) // create worker reqch := make(chan dialRequest) resch := make(chan dialResponse) cl := newMockClock() st := cl.Now() worker1 := newDialWorker(s1, s2.LocalPeer(), reqch, cl) go worker1.loop() defer worker1.wg.Wait() defer close(reqch) // trigger the request reqch <- dialRequest{ctx: context.Background(), resch: resch} connected := false // Advance the clock by 10 ms every iteration // At every iteration: // Check if any dial should fail. if it should, trigger the failure by sending a message on the // listener failCh // If there are no dials in flight check the most urgent dials have been triggered // If there are dials in flight check that the relevant dials have been triggered // Before next iteration ensure that no unexpected dials are received loop: for { // fail any dials that should fail at this instant for a, p := range failDials { if p.failAt.Before(cl.Now()) || p.failAt == cl.Now() { p.ch <- struct{}{} delete(failDials, a) } } // if there are no pending dials, next dial should have been triggered trigger := len(failDials) == 0 // mi is the minimum delay of pending dials // if trigger is true, all dials with miDelay should have been triggered mi := time.Duration(math.MaxInt64) for _, ds := range allDials { if ds.delay < mi { mi = ds.delay } } for a, ds := range allDials { if (trigger && mi == ds.delay) || cl.Now().After(st.Add(ds.delay)) || cl.Now() == st.Add(ds.delay) { if ds.success { // check for success and exit select { case r := <-resch: if r.conn == nil { return errors.New("expected connection to succeed") } // High timeout here is okay. We will exit whenever the other branch // is triggered case <-time.After(10 * time.Second): return errors.New("expected to receive a response") } connected = true break loop } else { // ensure that a failing dial attempt happened but didn't succeed select { case <-recvCh: case <-resch: return errors.New("didn't expect a response") // High timeout here is okay. We will exit whenever the other branch // is triggered case <-time.After(10 * time.Second): return errors.New("didn't receive a dial attempt notification") } failDials[a] = dialState{ ch: ds.ch, failAt: cl.Now().Add(ds.failAfter), addr: a, delay: ds.delay, } } delete(allDials, a) } } // check for unexpected dials select { case <-recvCh: return errors.New("no dial should have succeeded at this instant") default: } // advance the clock cl.AdvanceBy(10 * time.Millisecond) // nothing more to do. exit if len(failDials) == 0 && len(allDials) == 0 { break } } if connected { // ensure we don't receive any extra connections select { case <-recvCh: return errors.New("didn't expect a dial attempt") case <-time.After(100 * time.Millisecond): } } else { // ensure that we do receive the final error response select { case r := <-resch: require.Error(t, r.err) case <-time.After(100 * time.Millisecond): return errors.New("expected to receive response") } } // check if this test didn't take too much time if cl.Now().Sub(st) > tc.maxDuration { return fmt.Errorf("expected test to finish early: expected %d, took: %d", tc.maxDuration, cl.Now().Sub(st)) } return nil } // makeRanker takes a slice of timedDial objects and returns a DialRanker // which will trigger dials to addresses at the specified delays in the timedDials func makeRanker(tc []timedDial) network.DialRanker { return func(addrs []ma.Multiaddr) []network.AddrDelay { res := make([]network.AddrDelay, len(tc)) for i := 0; i < len(tc); i++ { res[i] = network.AddrDelay{Addr: tc[i].addr, Delay: tc[i].delay} } return res } } // TestCheckDialWorkerLoopScheduling will check the checker func TestCheckDialWorkerLoopScheduling(t *testing.T) { addrs := make([]ma.Multiaddr, 0) for i := 0; i < 10; i++ { for { p := 20000 + i addrs = append(addrs, ma.StringCast(fmt.Sprintf("/ip4/127.0.0.1/tcp/%d", p))) break } } tc := schedulingTestCase{ input: []timedDial{ { addr: addrs[1], delay: 0, success: true, }, { addr: addrs[0], delay: 100 * time.Millisecond, success: false, failAfter: 50 * time.Millisecond, }, }, maxDuration: 20 * time.Millisecond, } s1 := makeSwarmWithNoListenAddrs(t) s2 := makeSwarmWithNoListenAddrs(t) // valid ranking logic, so it shouldn't error s1.dialRanker = makeRanker(tc.input) err := checkDialWorkerLoopScheduling(t, s1, s2, tc) require.NoError(t, err) // close swarms to remove address binding s1.Close() s2.Close() s3 := makeSwarmWithNoListenAddrs(t) defer s3.Close() s4 := makeSwarmWithNoListenAddrs(t) defer s4.Close() // invalid ranking logic to trigger an error s3.dialRanker = NoDelayDialRanker err = checkDialWorkerLoopScheduling(t, s3, s4, tc) require.Error(t, err) } func TestDialWorkerLoopRanking(t *testing.T) { addrs := make([]ma.Multiaddr, 0) for i := 0; i < 10; i++ { for { p := 20000 + i addrs = append(addrs, ma.StringCast(fmt.Sprintf("/ip4/127.0.0.1/tcp/%d", p))) break } } testcases := []schedulingTestCase{ { name: "first success", input: []timedDial{ { addr: addrs[1], delay: 0, success: true, }, { addr: addrs[0], delay: 100 * time.Millisecond, success: false, failAfter: 50 * time.Millisecond, }, }, maxDuration: 20 * time.Millisecond, }, { name: "delayed dials", input: []timedDial{ { addr: addrs[0], delay: 0, success: false, failAfter: 200 * time.Millisecond, }, { addr: addrs[1], delay: 100 * time.Millisecond, success: false, failAfter: 100 * time.Millisecond, }, { addr: addrs[2], delay: 300 * time.Millisecond, success: false, failAfter: 100 * time.Millisecond, }, { addr: addrs[3], delay: 2 * time.Second, success: true, }, { addr: addrs[4], delay: 2*time.Second + 1*time.Millisecond, success: false, // this call will never happened failAfter: 100 * time.Millisecond, }, }, maxDuration: 310 * time.Millisecond, }, { name: "failed dials", input: []timedDial{ { addr: addrs[0], delay: 0, success: false, failAfter: 105 * time.Millisecond, }, { addr: addrs[1], delay: 100 * time.Millisecond, success: false, failAfter: 20 * time.Millisecond, }, }, maxDuration: 200 * time.Millisecond, }, } for _, tc := range testcases { t.Run(tc.name, func(t *testing.T) { s1 := makeSwarmWithNoListenAddrs(t) defer s1.Close() s2 := makeSwarmWithNoListenAddrs(t) defer s2.Close() // setup the ranker to trigger dials according to the test case s1.dialRanker = makeRanker(tc.input) err := checkDialWorkerLoopScheduling(t, s1, s2, tc) if err != nil { t.Error(err) } }) } } func TestDialWorkerLoopSchedulingProperty(t *testing.T) { f := func(tc schedulingTestCase) bool { s1 := makeSwarmWithNoListenAddrs(t) defer s1.Close() // ignore limiter delays just check scheduling s1.limiter.perPeerLimit = 10000 s2 := makeSwarmWithNoListenAddrs(t) defer s2.Close() // setup the ranker to trigger dials according to the test case s1.dialRanker = makeRanker(tc.input) err := checkDialWorkerLoopScheduling(t, s1, s2, tc) if err != nil { log.Error(err) } return err == nil } if err := quick.Check(f, &quick.Config{MaxCount: 50}); err != nil { t.Error(err) } } func TestDialWorkerLoopQuicOverTCP(t *testing.T) { tc := schedulingTestCase{ input: []timedDial{ { addr: ma.StringCast("/ip4/127.0.0.1/udp/20000/quic"), delay: 0, success: true, }, { addr: ma.StringCast("/ip4/127.0.0.1/tcp/20000"), delay: 30 * time.Millisecond, success: true, }, }, maxDuration: 20 * time.Millisecond, } s1 := makeSwarmWithNoListenAddrs(t) defer s1.Close() s2 := makeSwarmWithNoListenAddrs(t) defer s2.Close() // we use the default ranker here err := checkDialWorkerLoopScheduling(t, s1, s2, tc) require.NoError(t, err) } func TestDialWorkerLoopHolePunching(t *testing.T) { s1 := makeSwarmWithNoListenAddrs(t) defer s1.Close() s2 := makeSwarmWithNoListenAddrs(t) defer s2.Close() // t1 will accept and keep the other end waiting t1 := ma.StringCast("/ip4/127.0.0.1/tcp/10000") recvCh := make(chan struct{}) list, ch := makeTCPListener(t, t1, recvCh) // ignore ch because we want to hang forever defer list.Close() defer func() { ch <- struct{}{} }() // close listener // t2 will succeed t2 := ma.StringCast("/ip4/127.0.0.1/tcp/10001") err := s2.AddListenAddr(t2) if err != nil { t.Error(err) } s1.dialRanker = func(addrs []ma.Multiaddr) (res []network.AddrDelay) { res = make([]network.AddrDelay, len(addrs)) for i := 0; i < len(addrs); i++ { delay := 10 * time.Second if addrs[i].Equal(t1) { //fire t1 immediately delay = 0 } else if addrs[i].Equal(t2) { // delay t2 by 100ms // without holepunch this call will not happen delay = 100 * time.Millisecond } res[i] = network.AddrDelay{Addr: addrs[i], Delay: delay} } return } s1.Peerstore().AddAddrs(s2.LocalPeer(), []ma.Multiaddr{t1, t2}, peerstore.PermanentAddrTTL) reqch := make(chan dialRequest) resch := make(chan dialResponse, 2) cl := newMockClock() worker := newDialWorker(s1, s2.LocalPeer(), reqch, cl) go worker.loop() defer worker.wg.Wait() defer close(reqch) reqch <- dialRequest{ctx: context.Background(), resch: resch} <-recvCh // received connection on t1 select { case <-resch: t.Errorf("didn't expect connection to succeed") case <-time.After(100 * time.Millisecond): } hpCtx := network.WithSimultaneousConnect(context.Background(), true, "testing") // with holepunch request, t2 will be dialed immediately reqch <- dialRequest{ctx: hpCtx, resch: resch} select { case r := <-resch: require.NoError(t, r.err) case <-time.After(5 * time.Second): t.Errorf("expected conn to succeed") } select { case r := <-resch: require.NoError(t, r.err) case <-time.After(5 * time.Second): t.Errorf("expected conn to succeed") } } func TestDialWorkerLoopAddrDedup(t *testing.T) { s1 := makeSwarm(t) s2 := makeSwarm(t) defer s1.Close() defer s2.Close() t1 := ma.StringCast(fmt.Sprintf("/ip4/127.0.0.1/tcp/%d", 10000)) t2 := ma.StringCast(fmt.Sprintf("/ip4/127.0.0.1/tcp/%d", 10000)) // acceptAndClose accepts a connection and closes it acceptAndClose := func(a ma.Multiaddr, ch chan struct{}, closech chan struct{}) { list, err := manet.Listen(a) if err != nil { t.Error(err) return } go func() { ch <- struct{}{} for { conn, err := list.Accept() if err != nil { return } ch <- struct{}{} conn.Close() } }() <-closech list.Close() } ch := make(chan struct{}, 1) closeCh := make(chan struct{}) go acceptAndClose(t1, ch, closeCh) defer close(closeCh) <-ch // the routine has started listening on addr s1.Peerstore().AddAddrs(s2.LocalPeer(), []ma.Multiaddr{t1}, peerstore.PermanentAddrTTL) reqch := make(chan dialRequest) resch := make(chan dialResponse, 2) worker := newDialWorker(s1, s2.LocalPeer(), reqch, nil) go worker.loop() defer worker.wg.Wait() defer close(reqch) reqch <- dialRequest{ctx: context.Background(), resch: resch} <-ch <-resch // Need to clear backoff otherwise the dial attempt would not be made s1.Backoff().Clear(s2.LocalPeer()) s1.Peerstore().ClearAddrs(s2.LocalPeer()) s1.Peerstore().AddAddrs(s2.LocalPeer(), []ma.Multiaddr{t2}, peerstore.PermanentAddrTTL) reqch <- dialRequest{ctx: context.Background(), resch: resch} select { case r := <-resch: require.Error(t, r.err) case <-ch: t.Errorf("didn't expect a connection attempt") case <-time.After(5 * time.Second): t.Errorf("expected a fail response") } }