ceremonyclient/go-libp2p/p2p/net/swarm/dial_test.go

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2023-08-21 03:50:38 +00:00
package swarm_test
import (
"context"
"net"
"sync"
"testing"
"time"
"github.com/libp2p/go-libp2p/core/network"
"github.com/libp2p/go-libp2p/core/peer"
"github.com/libp2p/go-libp2p/core/peerstore"
testutil "github.com/libp2p/go-libp2p/core/test"
"github.com/libp2p/go-libp2p/p2p/net/swarm"
swarmt "github.com/libp2p/go-libp2p/p2p/net/swarm/testing"
"github.com/libp2p/go-libp2p-testing/ci"
ma "github.com/multiformats/go-multiaddr"
madns "github.com/multiformats/go-multiaddr-dns"
manet "github.com/multiformats/go-multiaddr/net"
"github.com/stretchr/testify/require"
)
func closeSwarms(swarms []*swarm.Swarm) {
for _, s := range swarms {
s.Close()
}
}
func TestBasicDialPeer(t *testing.T) {
swarms := makeSwarms(t, 2)
defer closeSwarms(swarms)
s1 := swarms[0]
s2 := swarms[1]
s1.Peerstore().AddAddrs(s2.LocalPeer(), s2.ListenAddresses(), peerstore.PermanentAddrTTL)
c, err := s1.DialPeer(context.Background(), s2.LocalPeer())
require.NoError(t, err)
s, err := c.NewStream(context.Background())
require.NoError(t, err)
s.Close()
}
func TestBasicDialPeerWithResolver(t *testing.T) {
mockResolver := madns.MockResolver{IP: make(map[string][]net.IPAddr)}
ipaddr, err := net.ResolveIPAddr("ip4", "127.0.0.1")
require.NoError(t, err)
mockResolver.IP["example.com"] = []net.IPAddr{*ipaddr}
resolver, err := madns.NewResolver(madns.WithDomainResolver("example.com", &mockResolver))
require.NoError(t, err)
swarms := makeSwarms(t, 2, swarmt.WithSwarmOpts(swarm.WithMultiaddrResolver(resolver)))
defer closeSwarms(swarms)
s1 := swarms[0]
s2 := swarms[1]
// Change the multiaddr from /ip4/127.0.0.1/... to /dns4/example.com/... so
// that the resovler has to resolve this
var s2Addrs []ma.Multiaddr
for _, a := range s2.ListenAddresses() {
_, rest := ma.SplitFunc(a, func(c ma.Component) bool {
return c.Protocol().Code == ma.P_TCP || c.Protocol().Code == ma.P_UDP
},
)
if rest != nil {
s2Addrs = append(s2Addrs, ma.StringCast("/dns4/example.com").Encapsulate(rest))
}
}
s1.Peerstore().AddAddrs(s2.LocalPeer(), s2Addrs, peerstore.PermanentAddrTTL)
c, err := s1.DialPeer(context.Background(), s2.LocalPeer())
require.NoError(t, err)
s, err := c.NewStream(context.Background())
require.NoError(t, err)
s.Close()
}
func TestDialWithNoListeners(t *testing.T) {
s1 := makeDialOnlySwarm(t)
swarms := makeSwarms(t, 1)
defer closeSwarms(swarms)
s2 := swarms[0]
s1.Peerstore().AddAddrs(s2.LocalPeer(), s2.ListenAddresses(), peerstore.PermanentAddrTTL)
c, err := s1.DialPeer(context.Background(), s2.LocalPeer())
require.NoError(t, err)
s, err := c.NewStream(context.Background())
require.NoError(t, err)
s.Close()
}
func acceptAndHang(l net.Listener) {
conns := make([]net.Conn, 0, 10)
for {
c, err := l.Accept()
if err != nil {
break
}
if c != nil {
conns = append(conns, c)
}
}
for _, c := range conns {
c.Close()
}
}
func TestSimultDials(t *testing.T) {
ctx := context.Background()
swarms := makeSwarms(t, 2, swarmt.OptDisableReuseport)
defer closeSwarms(swarms)
// connect everyone
{
var wg sync.WaitGroup
errs := make(chan error, 20) // 2 connect calls in each of the 10 for-loop iterations
connect := func(s *swarm.Swarm, dst peer.ID, addr ma.Multiaddr) {
// copy for other peer
log.Debugf("TestSimultOpen: connecting: %s --> %s (%s)", s.LocalPeer(), dst, addr)
s.Peerstore().AddAddr(dst, addr, peerstore.TempAddrTTL)
if _, err := s.DialPeer(ctx, dst); err != nil {
errs <- err
}
wg.Done()
}
ifaceAddrs0, err := swarms[0].InterfaceListenAddresses()
if err != nil {
t.Fatal(err)
}
ifaceAddrs1, err := swarms[1].InterfaceListenAddresses()
if err != nil {
t.Fatal(err)
}
log.Info("Connecting swarms simultaneously.")
for i := 0; i < 10; i++ { // connect 10x for each.
wg.Add(2)
go connect(swarms[0], swarms[1].LocalPeer(), ifaceAddrs1[0])
go connect(swarms[1], swarms[0].LocalPeer(), ifaceAddrs0[0])
}
wg.Wait()
close(errs)
for err := range errs {
if err != nil {
t.Fatal("error swarm dialing to peer", err)
}
}
}
// should still just have 1, at most 2 connections :)
c01l := len(swarms[0].ConnsToPeer(swarms[1].LocalPeer()))
if c01l > 2 {
t.Error("0->1 has", c01l)
}
c10l := len(swarms[1].ConnsToPeer(swarms[0].LocalPeer()))
if c10l > 2 {
t.Error("1->0 has", c10l)
}
}
func newSilentPeer(t *testing.T) (peer.ID, ma.Multiaddr, net.Listener) {
dst := testutil.RandPeerIDFatal(t)
lst, err := net.Listen("tcp4", "localhost:0")
if err != nil {
t.Fatal(err)
}
addr, err := manet.FromNetAddr(lst.Addr())
if err != nil {
t.Fatal(err)
}
addrs, err := manet.ResolveUnspecifiedAddresses([]ma.Multiaddr{addr}, nil)
if err != nil {
t.Fatal(err)
}
t.Log("new silent peer:", dst, addrs[0])
return dst, addrs[0], lst
}
func TestDialWait(t *testing.T) {
const dialTimeout = 5 * time.Second
swarms := makeSwarms(t, 1, swarmt.WithSwarmOpts(swarm.WithDialTimeout(dialTimeout)))
s1 := swarms[0]
defer s1.Close()
// dial to a non-existent peer.
s2p, s2addr, s2l := newSilentPeer(t)
go acceptAndHang(s2l)
defer s2l.Close()
s1.Peerstore().AddAddr(s2p, s2addr, peerstore.PermanentAddrTTL)
before := time.Now()
if c, err := s1.DialPeer(context.Background(), s2p); err == nil {
defer c.Close()
t.Fatal("error swarm dialing to unknown peer worked...", err)
} else {
t.Log("correctly got error:", err)
}
duration := time.Since(before)
if duration < dialTimeout*swarm.DialAttempts {
t.Error("< dialTimeout * DialAttempts not being respected", duration, dialTimeout*swarm.DialAttempts)
}
if duration > 2*dialTimeout*swarm.DialAttempts {
t.Error("> 2*dialTimeout * DialAttempts not being respected", duration, 2*dialTimeout*swarm.DialAttempts)
}
if !s1.Backoff().Backoff(s2p, s2addr) {
t.Error("s2 should now be on backoff")
}
}
func TestDialBackoff(t *testing.T) {
if ci.IsRunning() {
t.Skip("travis will never have fun with this test")
}
const dialTimeout = 100 * time.Millisecond
ctx := context.Background()
swarms := makeSwarms(t, 2, swarmt.WithSwarmOpts(swarm.WithDialTimeout(dialTimeout)))
defer closeSwarms(swarms)
s1 := swarms[0]
s2 := swarms[1]
s2addrs, err := s2.InterfaceListenAddresses()
require.NoError(t, err)
s1.Peerstore().AddAddrs(s2.LocalPeer(), s2addrs, peerstore.PermanentAddrTTL)
// dial to a non-existent peer.
s3p, s3addr, s3l := newSilentPeer(t)
go acceptAndHang(s3l)
defer s3l.Close()
s1.Peerstore().AddAddr(s3p, s3addr, peerstore.PermanentAddrTTL)
// in this test we will:
// 1) dial 10x to each node.
// 2) all dials should hang
// 3) s1->s2 should succeed.
// 4) s1->s3 should not (and should place s3 on backoff)
// 5) disconnect entirely
// 6) dial 10x to each node again
// 7) s3 dials should all return immediately (except 1)
// 8) s2 dials should all hang, and succeed
// 9) last s3 dial ends, unsuccessful
dialOnlineNode := func(dst peer.ID, times int) <-chan bool {
ch := make(chan bool)
for i := 0; i < times; i++ {
go func() {
if _, err := s1.DialPeer(ctx, dst); err != nil {
t.Error("error dialing", dst, err)
ch <- false
} else {
ch <- true
}
}()
}
return ch
}
dialOfflineNode := func(dst peer.ID, times int) <-chan bool {
ch := make(chan bool)
for i := 0; i < times; i++ {
go func() {
if c, err := s1.DialPeer(ctx, dst); err != nil {
ch <- false
} else {
t.Error("succeeded in dialing", dst)
ch <- true
c.Close()
}
}()
}
return ch
}
{
// 1) dial 10x to each node.
N := 10
s2done := dialOnlineNode(s2.LocalPeer(), N)
s3done := dialOfflineNode(s3p, N)
// when all dials should be done by:
dialTimeout1x := time.After(dialTimeout)
dialTimeout10Ax := time.After(dialTimeout * 2 * 10) // DialAttempts * 10)
// 2) all dials should hang
select {
case <-s2done:
t.Error("s2 should not happen immediately")
case <-s3done:
t.Error("s3 should not happen yet")
case <-time.After(time.Millisecond):
// s2 may finish very quickly, so let's get out.
}
// 3) s1->s2 should succeed.
for i := 0; i < N; i++ {
select {
case r := <-s2done:
if !r {
t.Error("s2 should not fail")
}
case <-s3done:
t.Error("s3 should not happen yet")
case <-dialTimeout1x:
t.Error("s2 took too long")
}
}
select {
case <-s2done:
t.Error("s2 should have no more")
case <-s3done:
t.Error("s3 should not happen yet")
case <-dialTimeout1x: // let it pass
}
// 4) s1->s3 should not (and should place s3 on backoff)
// N-1 should finish before dialTimeout1x * 2
for i := 0; i < N; i++ {
select {
case <-s2done:
t.Error("s2 should have no more")
case r := <-s3done:
if r {
t.Error("s3 should not succeed")
}
case <-(dialTimeout1x):
if i < (N - 1) {
t.Fatal("s3 took too long")
}
t.Log("dialTimeout1x * 1.3 hit for last peer")
case <-dialTimeout10Ax:
t.Fatal("s3 took too long")
}
}
// check backoff state
if s1.Backoff().Backoff(s2.LocalPeer(), s2addrs[0]) {
t.Error("s2 should not be on backoff")
}
if !s1.Backoff().Backoff(s3p, s3addr) {
t.Error("s3 should be on backoff")
}
// 5) disconnect entirely
for _, c := range s1.Conns() {
c.Close()
}
for i := 0; i < 100 && len(s1.Conns()) > 0; i++ {
<-time.After(time.Millisecond)
}
if len(s1.Conns()) > 0 {
t.Fatal("s1 conns must exit")
}
}
{
// 6) dial 10x to each node again
N := 10
s2done := dialOnlineNode(s2.LocalPeer(), N)
s3done := dialOfflineNode(s3p, N)
// when all dials should be done by:
dialTimeout1x := time.After(dialTimeout)
dialTimeout10Ax := time.After(dialTimeout * 2 * 10) // DialAttempts * 10)
// 7) s3 dials should all return immediately (except 1)
for i := 0; i < N-1; i++ {
select {
case <-s2done:
t.Error("s2 should not succeed yet")
case r := <-s3done:
if r {
t.Error("s3 should not succeed")
}
case <-dialTimeout1x:
t.Fatal("s3 took too long")
}
}
// 8) s2 dials should all hang, and succeed
for i := 0; i < N; i++ {
select {
case r := <-s2done:
if !r {
t.Error("s2 should succeed")
}
// case <-s3done:
case <-(dialTimeout1x):
t.Fatal("s3 took too long")
}
}
// 9) the last s3 should return, failed.
select {
case <-s2done:
t.Error("s2 should have no more")
case r := <-s3done:
if r {
t.Error("s3 should not succeed")
}
case <-dialTimeout10Ax:
t.Fatal("s3 took too long")
}
// check backoff state (the same)
if s1.Backoff().Backoff(s2.LocalPeer(), s2addrs[0]) {
t.Error("s2 should not be on backoff")
}
if !s1.Backoff().Backoff(s3p, s3addr) {
t.Error("s3 should be on backoff")
}
}
}
func TestDialBackoffClears(t *testing.T) {
const dialTimeout = 3 * time.Second
swarms := makeSwarms(t, 2, swarmt.WithSwarmOpts(swarm.WithDialTimeout(dialTimeout)))
defer closeSwarms(swarms)
s1 := swarms[0]
s2 := swarms[1]
// use another address first, that accept and hang on conns
_, s2bad, s2l := newSilentPeer(t)
go acceptAndHang(s2l)
defer s2l.Close()
// phase 1 -- dial to non-operational addresses
s1.Peerstore().AddAddr(s2.LocalPeer(), s2bad, peerstore.PermanentAddrTTL)
before := time.Now()
_, err := s1.DialPeer(context.Background(), s2.LocalPeer())
require.Error(t, err, "dialing to broken addr worked...")
duration := time.Since(before)
if duration < dialTimeout*swarm.DialAttempts {
t.Error("< dialTimeout * DialAttempts not being respected", duration, dialTimeout*swarm.DialAttempts)
}
if duration > 2*dialTimeout*swarm.DialAttempts {
t.Error("> 2*dialTimeout * DialAttempts not being respected", duration, 2*dialTimeout*swarm.DialAttempts)
}
require.True(t, s1.Backoff().Backoff(s2.LocalPeer(), s2bad), "s2 should now be on backoff")
// phase 2 -- add the working address. dial should succeed.
ifaceAddrs1, err := s2.InterfaceListenAddresses()
require.NoError(t, err)
s1.Peerstore().AddAddrs(s2.LocalPeer(), ifaceAddrs1, peerstore.PermanentAddrTTL)
// backoffs are per address, not peer
c, err := s1.DialPeer(context.Background(), s2.LocalPeer())
require.NoError(t, err)
defer c.Close()
require.False(t, s1.Backoff().Backoff(s2.LocalPeer(), s2bad), "s2 should no longer be on backoff")
}
func TestDialPeerFailed(t *testing.T) {
swarms := makeSwarms(t, 2, swarmt.WithSwarmOpts(swarm.WithDialTimeout(100*time.Millisecond)))
defer closeSwarms(swarms)
testedSwarm, targetSwarm := swarms[0], swarms[1]
const expectedErrorsCount = 5
for i := 0; i < expectedErrorsCount; i++ {
_, silentPeerAddress, silentPeerListener := newSilentPeer(t)
go acceptAndHang(silentPeerListener)
defer silentPeerListener.Close()
testedSwarm.Peerstore().AddAddr(targetSwarm.LocalPeer(), silentPeerAddress, peerstore.PermanentAddrTTL)
}
_, err := testedSwarm.DialPeer(context.Background(), targetSwarm.LocalPeer())
require.Error(t, err)
// dial_test.go:508: correctly get a combined error: failed to dial PEER: all dials failed
// * [/ip4/127.0.0.1/tcp/46485] failed to negotiate security protocol: context deadline exceeded
// * [/ip4/127.0.0.1/tcp/34881] failed to negotiate security protocol: context deadline exceeded
// ...
dialErr, ok := err.(*swarm.DialError)
if !ok {
t.Fatalf("expected *DialError, got %T", err)
}
if len(dialErr.DialErrors) != expectedErrorsCount {
t.Errorf("expected %d errors, got %d", expectedErrorsCount, len(dialErr.DialErrors))
}
}
func TestDialExistingConnection(t *testing.T) {
swarms := makeSwarms(t, 2)
defer closeSwarms(swarms)
s1 := swarms[0]
s2 := swarms[1]
// Only use one of the addresses here.
// Otherwise, we might dial TCP and QUIC simultaneously here, and end up with two connections,
// if the handshake latencies line up exactly.
s1.Peerstore().AddAddrs(s2.LocalPeer(), s2.ListenAddresses()[:1], peerstore.PermanentAddrTTL)
c1, err := s1.DialPeer(context.Background(), s2.LocalPeer())
require.NoError(t, err)
c2, err := s1.DialPeer(context.Background(), s2.LocalPeer())
require.NoError(t, err)
// can't use require.Equal here, as this does a deep comparison
if c1 != c2 {
t.Fatalf("expecting the same connection from both dials, got %s <-> %s vs %s <-> %s", c1.LocalMultiaddr(), c1.RemoteMultiaddr(), c2.LocalMultiaddr(), c2.RemoteMultiaddr())
}
}
func newSilentListener(t *testing.T) ([]ma.Multiaddr, net.Listener) {
lst, err := net.Listen("tcp4", "localhost:0")
if err != nil {
t.Fatal(err)
}
addr, err := manet.FromNetAddr(lst.Addr())
if err != nil {
t.Fatal(err)
}
addrs, err := manet.ResolveUnspecifiedAddresses([]ma.Multiaddr{addr}, nil)
if err != nil {
t.Fatal(err)
}
return addrs, lst
}
func TestDialSimultaneousJoin(t *testing.T) {
const dialTimeout = 3 * time.Second
swarms := makeSwarms(t, 2, swarmt.WithSwarmOpts(swarm.WithDialTimeout(dialTimeout)))
defer closeSwarms(swarms)
s1 := swarms[0]
s2 := swarms[1]
s2silentAddrs, s2silentListener := newSilentListener(t)
go acceptAndHang(s2silentListener)
connch := make(chan network.Conn, 512)
errs := make(chan error, 2)
// start a dial to s2 through the silent addr
go func() {
s1.Peerstore().AddAddrs(s2.LocalPeer(), s2silentAddrs, peerstore.PermanentAddrTTL)
c, err := s1.DialPeer(context.Background(), s2.LocalPeer())
if err != nil {
errs <- err
connch <- nil
return
}
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t.Logf("first dial succeeded; conn: %+v", c)
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connch <- c
errs <- nil
}()
// wait a bit for the dial to take hold
time.Sleep(100 * time.Millisecond)
// start a second dial to s2 that uses the real s2 addrs
go func() {
s2addrs, err := s2.InterfaceListenAddresses()
if err != nil {
errs <- err
return
}
s1.Peerstore().AddAddrs(s2.LocalPeer(), s2addrs[:1], peerstore.PermanentAddrTTL)
c, err := s1.DialPeer(context.Background(), s2.LocalPeer())
if err != nil {
errs <- err
connch <- nil
return
}
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t.Logf("second dial succeeded; conn: %+v", c)
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connch <- c
errs <- nil
}()
// wait for the second dial to finish
c2 := <-connch
// start a third dial to s2, this should get the existing connection from the successful dial
go func() {
c, err := s1.DialPeer(context.Background(), s2.LocalPeer())
if err != nil {
errs <- err
connch <- nil
return
}
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t.Logf("third dial succeeded; conn: %+v", c)
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connch <- c
errs <- nil
}()
c3 := <-connch
// raise any errors from the previous goroutines
for i := 0; i < 3; i++ {
require.NoError(t, <-errs)
}
if c2 != c3 {
t.Fatal("expected c2 and c3 to be the same")
}
// next, the first dial to s2, using the silent addr should timeout; at this point the dial
// will error but the last chance check will see the existing connection and return it
select {
case c1 := <-connch:
if c1 != c2 {
t.Fatal("expected c1 and c2 to be the same")
}
case <-time.After(2 * dialTimeout):
t.Fatal("no connection from first dial")
}
}
func TestDialSelf(t *testing.T) {
swarms := makeSwarms(t, 2)
defer closeSwarms(swarms)
s1 := swarms[0]
_, err := s1.DialPeer(context.Background(), s1.LocalPeer())
require.ErrorIs(t, err, swarm.ErrDialToSelf, "expected error from self dial")
}
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func TestDialQUICDraft29(t *testing.T) {
s := makeDialOnlySwarm(t)
id := testutil.RandPeerIDFatal(t)
s.Peerstore().AddAddr(id, ma.StringCast("/ip4/127.0.0.1/udp/1234/quic"), time.Hour)
_, err := s.DialPeer(context.Background(), id)
require.ErrorIs(t, err, swarm.ErrQUICDraft29)
require.ErrorIs(t, err, swarm.ErrNoTransport)
}