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identify: refactor sending of Identify pushes (#1984) 

* identify: cache the snapshot

* identify: refactor sending of Identify pushes

* identify: fix concurrency when sending pushes

* identify: fix timestamp handling

* identify: remove unneeded pushSemaphore

* identify: improve logging

* identify: use a sequence number instead of a timestamp

* identify: start with an empty snapshot

* identify: wait until we've actually finished setting up
This commit is contained in:
Marten Seemann 2023-02-08 14:44:33 -08:00 committed by GitHub
parent ad2f6d0223
commit 235f25b487
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
11 changed files with 330 additions and 439 deletions
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3
p2p/host/basic/basic_host.go
View File

@ -181,7 +181,7 @@ func NewHost(n network.Network, opts *HostOpts) (*BasicHost, error) {
h.updateLocalIpAddr()
if h.emitters.evtLocalProtocolsUpdated, err = h.eventbus.Emitter(&event.EvtLocalProtocolsUpdated{}); err != nil {
if h.emitters.evtLocalProtocolsUpdated, err = h.eventbus.Emitter(&event.EvtLocalProtocolsUpdated{}, eventbus.Stateful); err != nil {
return nil, err
}
if h.emitters.evtLocalAddrsUpdated, err = h.eventbus.Emitter(&event.EvtLocalAddressesUpdated{}, eventbus.Stateful); err != nil {
@ -367,6 +367,7 @@ func (h *BasicHost) updateLocalIpAddr() {
func (h *BasicHost) Start() {
h.psManager.Start()
h.refCount.Add(1)
h.ids.Start()
go h.background()
}

21
p2p/host/basic/basic_host_test.go
View File

@ -176,7 +176,7 @@ func TestHostAddrsFactory(t *testing.T) {
addrs := h.Addrs()
if len(addrs) != 1 {
t.Fatalf("expected 1 addr, got %d", len(addrs))
t.Fatalf("expected 1 addr, got %+v", addrs)
}
if !addrs[0].Equal(maddr) {
t.Fatalf("expected %s, got %s", maddr.String(), addrs[0].String())
@ -245,8 +245,10 @@ func getHostPair(t *testing.T) (host.Host, host.Host) {
h1, err := NewHost(swarmt.GenSwarm(t), nil)
require.NoError(t, err)
h1.Start()
h2, err := NewHost(swarmt.GenSwarm(t), nil)
require.NoError(t, err)
h2.Start()
ctx, cancel := context.WithTimeout(context.Background(), time.Second)
defer cancel()
@ -342,14 +344,12 @@ func TestHostProtoMismatch(t *testing.T) {
}
func TestHostProtoPreknowledge(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
h1, err := NewHost(swarmt.GenSwarm(t), nil)
require.NoError(t, err)
defer h1.Close()
h2, err := NewHost(swarmt.GenSwarm(t), nil)
require.NoError(t, err)
defer h1.Close()
defer h2.Close()
conn := make(chan protocol.ID)
@ -362,8 +362,11 @@ func TestHostProtoPreknowledge(t *testing.T) {
// Prevent pushing identify information so this test actually _uses_ the super protocol.
h1.RemoveStreamHandler(identify.IDPush)
h1.Start()
h2.Start()
h2pi := h2.Peerstore().PeerInfo(h2.ID())
require.NoError(t, h1.Connect(ctx, h2pi))
require.NoError(t, h1.Connect(context.Background(), h2pi))
// wait for identify handshake to finish completely
select {
@ -380,12 +383,12 @@ func TestHostProtoPreknowledge(t *testing.T) {
h2.SetStreamHandler("/foo", handler)
s, err := h1.NewStream(ctx, h2.ID(), "/foo", "/bar", "/super")
s, err := h1.NewStream(context.Background(), h2.ID(), "/foo", "/bar", "/super")
require.NoError(t, err)
select {
case p := <-conn:
t.Fatal("shouldnt have gotten connection yet, we should have a lazy stream: ", p)
t.Fatal("shouldn't have gotten connection yet, we should have a lazy stream: ", p)
case <-time.After(time.Millisecond * 50):
}
@ -532,7 +535,6 @@ func TestAddrChangeImmediatelyIfAddressNonEmpty(t *testing.T) {
return taddrs
}})
require.NoError(t, err)
h.Start()
defer h.Close()
sub, err := h.EventBus().Subscribe(&event.EvtLocalAddressesUpdated{})
@ -541,6 +543,7 @@ func TestAddrChangeImmediatelyIfAddressNonEmpty(t *testing.T) {
t.Error(err)
}
defer sub.Close()
h.Start()
expected := event.EvtLocalAddressesUpdated{
Diffs: true,

2
p2p/net/mock/mock_test.go
View File

@ -528,7 +528,7 @@ func TestLimitedStreams(t *testing.T) {
}
wg.Wait()
if !within(time.Since(before), time.Second*2, time.Second) {
if !within(time.Since(before), time.Second*5/2, time.Second) {
t.Fatal("Expected 2ish seconds but got ", time.Since(before))
}
}

21
p2p/protocol/holepunch/holepunch_test.go
View File

@ -7,6 +7,10 @@ import (
"testing"
"time"
"github.com/libp2p/go-libp2p/p2p/transport/tcp"
"github.com/libp2p/go-libp2p/p2p/protocol/circuitv2/proto"
"github.com/libp2p/go-libp2p"
"github.com/libp2p/go-libp2p-testing/race"
"github.com/libp2p/go-libp2p/core/host"
@ -68,6 +72,8 @@ var _ identify.IDService = &mockIDService{}
func newMockIDService(t *testing.T, h host.Host) identify.IDService {
ids, err := identify.NewIDService(h)
require.NoError(t, err)
ids.Start()
t.Cleanup(func() { ids.Close() })
return &mockIDService{IDService: ids}
}
@ -448,10 +454,23 @@ func makeRelayedHosts(t *testing.T, h1opt, h2opt []holepunch.Option, addHolePunc
libp2p.ResourceManager(&network.NullResourceManager{}),
)
require.NoError(t, err)
_, err = relayv1.NewRelay(relay)
require.NoError(t, err)
// make sure the relay service is started and advertised by Identify
h, err := libp2p.New(
libp2p.NoListenAddrs,
libp2p.Transport(tcp.NewTCPTransport),
libp2p.DisableRelay(),
)
require.NoError(t, err)
defer h.Close()
require.NoError(t, h.Connect(context.Background(), peer.AddrInfo{ID: relay.ID(), Addrs: relay.Addrs()}))
require.Eventually(t, func() bool {
supported, err := h.Peerstore().SupportsProtocols(relay.ID(), proto.ProtoIDv2Hop, relayv1.ProtoID)
return err == nil && len(supported) > 0
}, 3*time.Second, 100*time.Millisecond)
h2 = mkHostWithStaticAutoRelay(t, relay)
if addHolePuncher {
hps = addHolePunchService(t, h2, h2opt...)

474
p2p/protocol/identify/id.go
View File

@ -30,9 +30,13 @@ import (
var log = logging.Logger("net/identify")
// ID is the protocol.ID of version 1.0.0 of the identify
// service.
const ID = "/ipfs/id/1.0.0"
const (
// ID is the protocol.ID of version 1.0.0 of the identify service.
ID = "/ipfs/id/1.0.0"
// IDPush is the protocol.ID of the Identify push protocol.
// It sends full identify messages containing the current state of the peer.
IDPush = "/ipfs/id/push/1.0.0"
)
const DefaultProtocolVersion = "ipfs/0.1.0"
@ -51,13 +55,11 @@ const (
var defaultUserAgent = "github.com/libp2p/go-libp2p"
type addPeerHandlerReq struct {
rp peer.ID
resp chan *peerHandler
}
type rmPeerHandlerReq struct {
p peer.ID
type identifySnapshot struct {
seq uint64
protocols []protocol.ID
addrs []ma.Multiaddr
record *record.Envelope
}
type IDService interface {
@ -75,22 +77,45 @@ type IDService interface {
// ObservedAddrsFor returns the addresses peers have reported we've dialed from,
// for a specific local address.
ObservedAddrsFor(local ma.Multiaddr) []ma.Multiaddr
Start()
io.Closer
}
type identifyPushSupport uint8
const (
identifyPushSupportUnknown identifyPushSupport = iota
identifyPushSupported
identifyPushUnsupported
)
type entry struct {
// The IdentifyWaitChan is created when IdentifyWait is called for the first time.
// IdentifyWait closes this channel when the Identify request completes, or when it fails.
IdentifyWaitChan chan struct{}
// PushSupport saves our knowledge about the peer's support of the Identify Push protocol.
// Before the identify request returns, we don't know yet if the peer supports Identify Push.
PushSupport identifyPushSupport
// Sequence is the sequence number of the last snapshot we sent to this peer.
Sequence uint64
}
// idService is a structure that implements ProtocolIdentify.
// It is a trivial service that gives the other peer some
// useful information about the local peer. A sort of hello.
//
// The idService sends:
// - Our IPFS Protocol Version
// - Our IPFS Agent Version
// - Our libp2p Protocol Version
// - Our libp2p Agent Version
// - Our public Listen Addresses
type idService struct {
Host host.Host
UserAgent string
ProtocolVersion string
setupCompleted chan struct{} // is closed when Start has finished setting up
ctx context.Context
ctxCancel context.CancelFunc
// track resources that need to be shut down before we shut down
@ -98,9 +123,13 @@ type idService struct {
disableSignedPeerRecord bool
// Identified connections (finished and in progress).
connsMu sync.RWMutex
conns map[network.Conn]chan struct{}
// The conns map contains all connections we're currently handling.
// Connections are inserted as soon as they're available in the swarm, and - crucially -
// before any stream can be opened or accepted on that connection.
// Connections are removed from the map when the connection disconnects.
// It is therefore safe to assume that a connection was (recently) closed if there's no entry in this map.
conns map[network.Conn]entry
addrMu sync.Mutex
@ -113,12 +142,10 @@ type idService struct {
evtPeerIdentificationFailed event.Emitter
}
addPeerHandlerCh chan addPeerHandlerReq
rmPeerHandlerCh chan rmPeerHandlerReq
// pushSemaphore limits the push concurrency to avoid storms
// that clog the transient scope.
pushSemaphore chan struct{}
currentSnapshot struct {
sync.Mutex
snapshot identifySnapshot
}
}
// NewIDService constructs a new *idService and activates it by
@ -139,21 +166,17 @@ func NewIDService(h host.Host, opts ...Option) (*idService, error) {
protocolVersion = cfg.protocolVersion
}
ctx, cancel := context.WithCancel(context.Background())
s := &idService{
Host: h,
UserAgent: userAgent,
ProtocolVersion: protocolVersion,
conns: make(map[network.Conn]chan struct{}),
Host: h,
UserAgent: userAgent,
ProtocolVersion: protocolVersion,
ctx: ctx,
ctxCancel: cancel,
conns: make(map[network.Conn]entry),
disableSignedPeerRecord: cfg.disableSignedPeerRecord,
addPeerHandlerCh: make(chan addPeerHandlerReq),
rmPeerHandlerCh: make(chan rmPeerHandlerReq),
pushSemaphore: make(chan struct{}, maxPushConcurrency),
setupCompleted: make(chan struct{}),
}
s.ctx, s.ctxCancel = context.WithCancel(context.Background())
observedAddrs, err := NewObservedAddrManager(h)
if err != nil {
@ -161,9 +184,6 @@ func NewIDService(h host.Host, opts ...Option) (*idService, error) {
}
s.observedAddrs = observedAddrs
s.refCount.Add(1)
go s.loop()
s.emitters.evtPeerProtocolsUpdated, err = h.EventBus().Emitter(&event.EvtPeerProtocolsUpdated{})
if err != nil {
log.Warnf("identify service not emitting peer protocol updates; err: %s", err)
@ -176,19 +196,23 @@ func NewIDService(h host.Host, opts ...Option) (*idService, error) {
if err != nil {
log.Warnf("identify service not emitting identification failed events; err: %s", err)
}
// register protocols that do not depend on peer records.
h.SetStreamHandler(ID, s.sendIdentifyResp)
h.SetStreamHandler(IDPush, s.pushHandler)
h.Network().Notify((*netNotifiee)(s))
return s, nil
}
func (ids *idService) loop() {
func (ids *idService) Start() {
ids.Host.Network().Notify((*netNotifiee)(ids))
ids.Host.SetStreamHandler(ID, ids.handleIdentifyRequest)
ids.Host.SetStreamHandler(IDPush, ids.handlePush)
ids.updateSnapshot()
close(ids.setupCompleted)
ids.refCount.Add(1)
go ids.loop(ids.ctx)
}
func (ids *idService) loop(ctx context.Context) {
defer ids.refCount.Done()
phs := make(map[peer.ID]*peerHandler)
sub, err := ids.Host.EventBus().Subscribe(
[]any{&event.EvtLocalProtocolsUpdated{}, &event.EvtLocalAddressesUpdated{}},
eventbus.BufSize(256),
@ -198,93 +222,93 @@ func (ids *idService) loop() {
log.Errorf("failed to subscribe to events on the bus, err=%s", err)
return
}
defer sub.Close()
phClosedCh := make(chan peer.ID)
// Send pushes from a separate Go routine.
// That way, we can end up with
// * this Go routine busy looping over all peers in sendPushes
// * another push being queued in the triggerPush channel
triggerPush := make(chan struct{}, 1)
ids.refCount.Add(1)
go func() {
defer ids.refCount.Done()
defer func() {
sub.Close()
// The context will cancel the workers. Now, wait for them to
// exit.
for range phs {
<-phClosedCh
for {
select {
case <-ctx.Done():
return
case <-triggerPush:
ids.sendPushes(ctx)
}
}
}()
// Use a fresh context for the handlers. Otherwise, they'll get canceled
// before we're ready to shutdown and they'll have "stopped" without us
// _calling_ stop.
handlerCtx, cancel := context.WithCancel(context.Background())
defer cancel()
for {
select {
case addReq := <-ids.addPeerHandlerCh:
rp := addReq.rp
ph, ok := phs[rp]
if !ok && ids.Host.Network().Connectedness(rp) == network.Connected {
ph = newPeerHandler(rp, ids)
ph.start(handlerCtx, func() { phClosedCh <- rp })
phs[rp] = ph
case <-sub.Out():
ids.updateSnapshot()
select {
case triggerPush <- struct{}{}:
default: // we already have one more push queued, no need to queue another one
}
addReq.resp <- ph
case rmReq := <-ids.rmPeerHandlerCh:
rp := rmReq.p
if ids.Host.Network().Connectedness(rp) != network.Connected {
// before we remove the peerhandler, we should ensure that it will not send any
// more messages. Otherwise, we might create a new handler and the Identify response
// synchronized with the new handler might be overwritten by a message sent by this "old" handler.
ph, ok := phs[rp]
if !ok {
// move on, move on, there's nothing to see here.
continue
}
// This is idempotent if already stopped.
ph.stop()
}
case rp := <-phClosedCh:
ph := phs[rp]
// If we are connected to the peer, it means that we got a connection from the peer
// before we could finish removing it's handler on the previous disconnection.
// If we delete the handler, we wont be able to push updates to it
// till we see a new connection. So, we should restart the handler.
// The fact that we got the handler on this channel means that it's context and handler
// have completed because we write the handler to this chanel only after it closed.
if ids.Host.Network().Connectedness(rp) == network.Connected {
ph.start(handlerCtx, func() { phClosedCh <- rp })
} else {
delete(phs, rp)
}
case e, more := <-sub.Out():
if !more {
return
}
switch e.(type) {
case event.EvtLocalAddressesUpdated:
for pid := range phs {
select {
case phs[pid].pushCh <- struct{}{}:
default:
log.Debugf("dropping addr updated message for %s as buffer full", pid)
}
}
case event.EvtLocalProtocolsUpdated:
for pid := range phs {
select {
case phs[pid].pushCh <- struct{}{}:
default:
log.Debugf("dropping protocol updated message for %s as buffer full", pid)
}
}
}
case <-ids.ctx.Done():
case <-ctx.Done():
return
}
}
}
func (ids *idService) sendPushes(ctx context.Context) {
ids.connsMu.RLock()
conns := make([]network.Conn, 0, len(ids.conns))
for c, e := range ids.conns {
// Push even if we don't know if push is supported.
// This will be only the case while the IdentifyWaitChan call is in flight.
if e.PushSupport == identifyPushSupported || e.PushSupport == identifyPushSupportUnknown {
conns = append(conns, c)
}
}
ids.connsMu.RUnlock()
sem := make(chan struct{}, maxPushConcurrency)
var wg sync.WaitGroup
for _, c := range conns {
// check if the connection is still alive
ids.connsMu.RLock()
e, ok := ids.conns[c]
ids.connsMu.RUnlock()
if !ok {
continue
}
// check if we already sent the current snapshot to this peer
ids.currentSnapshot.Lock()
snapshot := ids.currentSnapshot.snapshot
ids.currentSnapshot.Unlock()
if e.Sequence >= snapshot.seq {
log.Debugw("already sent this snapshot to peer", "peer", c.RemotePeer(), "seq", snapshot.seq)
continue
}
// we haven't, send it now
sem <- struct{}{}
wg.Add(1)
go func(c network.Conn) {
defer wg.Done()
defer func() { <-sem }()
ctx, cancel := context.WithTimeout(ctx, 5*time.Second)
defer cancel()
str, err := ids.Host.NewStream(ctx, c.RemotePeer(), IDPush)
if err != nil { // connection might have been closed recently
return
}
// TODO: find out if the peer supports push if we didn't have any information about push support
if err := ids.sendIdentifyResp(str); err != nil {
log.Debugw("failed to send identify push", "peer", c.RemotePeer(), "error", err)
return
}
}(c)
}
wg.Wait()
}
// Close shuts down the idService
func (ids *idService) Close() error {
ids.ctxCancel()
@ -301,58 +325,56 @@ func (ids *idService) ObservedAddrsFor(local ma.Multiaddr) []ma.Multiaddr {
return ids.observedAddrs.AddrsFor(local)
}
// IdentifyConn runs the Identify protocol on a connection.
// It returns when we've received the peer's Identify message (or the request fails).
// If successful, the peer store will contain the peer's addresses and supported protocols.
func (ids *idService) IdentifyConn(c network.Conn) {
<-ids.IdentifyWait(c)
}
// IdentifyWait runs the Identify protocol on a connection.
// It doesn't block and returns a channel that is closed when we receive
// the peer's Identify message (or the request fails).
// If successful, the peer store will contain the peer's addresses and supported protocols.
func (ids *idService) IdentifyWait(c network.Conn) <-chan struct{} {
ids.connsMu.RLock()
wait, found := ids.conns[c]
ids.connsMu.RUnlock()
if found {
return wait
}
ids.connsMu.Lock()
defer ids.connsMu.Unlock()
wait, found = ids.conns[c]
if !found {
wait = make(chan struct{})
ids.conns[c] = wait
// Spawn an identify. The connection may actually be closed
// already, but that doesn't really matter. We'll fail to open a
// stream then forget the connection.
go func() {
defer close(wait)
if err := ids.identifyConn(c); err != nil {
log.Warnf("failed to identify %s: %s", c.RemotePeer(), err)
ids.emitters.evtPeerIdentificationFailed.Emit(event.EvtPeerIdentificationFailed{Peer: c.RemotePeer(), Reason: err})
return
}
ids.emitters.evtPeerIdentificationCompleted.Emit(event.EvtPeerIdentificationCompleted{Peer: c.RemotePeer()})
}()
e, found := ids.conns[c]
if !found { // No entry found. Connection was most likely closed (and removed from this map) recently.
ch := make(chan struct{})
close(ch)
return ch
}
return wait
}
if e.IdentifyWaitChan != nil {
return e.IdentifyWaitChan
}
// First call to IdentifyWait for this connection. Create the channel.
e.IdentifyWaitChan = make(chan struct{})
ids.conns[c] = e
func (ids *idService) removeConn(c network.Conn) {
ids.connsMu.Lock()
delete(ids.conns, c)
ids.connsMu.Unlock()
// Spawn an identify. The connection may actually be closed
// already, but that doesn't really matter. We'll fail to open a
// stream then forget the connection.
go func() {
defer close(e.IdentifyWaitChan)
if err := ids.identifyConn(c); err != nil {
log.Warnf("failed to identify %s: %s", c.RemotePeer(), err)
ids.emitters.evtPeerIdentificationFailed.Emit(event.EvtPeerIdentificationFailed{Peer: c.RemotePeer(), Reason: err})
return
}
ids.emitters.evtPeerIdentificationCompleted.Emit(event.EvtPeerIdentificationCompleted{Peer: c.RemotePeer()})
}()
return e.IdentifyWaitChan
}
func (ids *idService) identifyConn(c network.Conn) error {
s, err := c.NewStream(network.WithUseTransient(context.TODO(), "identify"))
if err != nil {
log.Debugw("error opening identify stream", "error", err)
// We usually do this on disconnect, but we may have already
// processed the disconnect event.
ids.removeConn(c)
log.Debugw("error opening identify stream", "peer", c.RemotePeer(), "error", err)
return err
}
@ -371,39 +393,43 @@ func (ids *idService) identifyConn(c network.Conn) error {
return ids.handleIdentifyResponse(s, false)
}
func (ids *idService) sendIdentifyResp(s network.Stream) {
if err := s.Scope().SetService(ServiceName); err != nil {
log.Warnf("error attaching stream to identify service: %s", err)
s.Reset()
return
}
// handlePush handles incoming identify push streams
func (ids *idService) handlePush(s network.Stream) {
ids.handleIdentifyResponse(s, true)
}
func (ids *idService) handleIdentifyRequest(s network.Stream) {
_ = ids.sendIdentifyResp(s)
}
func (ids *idService) sendIdentifyResp(s network.Stream) error {
if err := s.Scope().SetService(ServiceName); err != nil {
s.Reset()
return fmt.Errorf("failed to attaching stream to identify service: %w", err)
}
defer s.Close()
c := s.Conn()
phCh := make(chan *peerHandler, 1)
select {
case ids.addPeerHandlerCh <- addPeerHandlerReq{c.RemotePeer(), phCh}:
case <-ids.ctx.Done():
return
ids.currentSnapshot.Lock()
snapshot := ids.currentSnapshot.snapshot
ids.currentSnapshot.Unlock()
log.Debugf("%s sending message to %s %s", ID, s.Conn().RemotePeer(), s.Conn().RemoteMultiaddr())
if err := ids.writeChunkedIdentifyMsg(s, &snapshot); err != nil {
return err
}
var ph *peerHandler
select {
case ph = <-phCh:
case <-ids.ctx.Done():
return
ids.connsMu.Lock()
defer ids.connsMu.Unlock()
e, ok := ids.conns[s.Conn()]
// The connection might already have been closed.
// We *should* receive the Connected notification from the swarm before we're able to accept the peer's
// Identify stream, but if that for some reason doesn't work, we also wouldn't have a map entry here.
// The only consequence would be that we send a spurious Push to that peer later.
if !ok {
return nil
}
if ph == nil {
// Peer disconnected, abort.
s.Reset()
return
}
ids.writeChunkedIdentifyMsg(c, s)
log.Debugf("%s sent message to %s %s", ID, c.RemotePeer(), c.RemoteMultiaddr())
e.Sequence = snapshot.seq
ids.conns[s.Conn()] = e
return nil
}
func (ids *idService) handleIdentifyResponse(s network.Stream, isPush bool) error {
@ -439,6 +465,19 @@ func (ids *idService) handleIdentifyResponse(s network.Stream, isPush bool) erro
ids.consumeMessage(mes, c, isPush)
ids.connsMu.Lock()
defer ids.connsMu.Unlock()
e, ok := ids.conns[c]
if !ok { // might already have disconnected
return nil
}
sup, err := ids.Host.Peerstore().SupportsProtocols(c.RemotePeer(), IDPush)
if supportsIdentifyPush := err == nil && len(sup) > 0; supportsIdentifyPush {
e.PushSupport = identifyPushSupported
} else {
e.PushSupport = identifyPushUnsupported
}
ids.conns[c] = e
return nil
}
@ -458,20 +497,29 @@ func readAllIDMessages(r pbio.Reader, finalMsg proto.Message) error {
return fmt.Errorf("too many parts")
}
func (ids *idService) getSnapshot() *identifySnapshot {
snapshot := new(identifySnapshot)
func (ids *idService) updateSnapshot() {
snapshot := identifySnapshot{
addrs: ids.Host.Addrs(),
protocols: ids.Host.Mux().Protocols(),
}
if !ids.disableSignedPeerRecord {
if cab, ok := peerstore.GetCertifiedAddrBook(ids.Host.Peerstore()); ok {
snapshot.record = cab.GetPeerRecord(ids.Host.ID())
}
}
snapshot.addrs = ids.Host.Addrs()
snapshot.protocols = ids.Host.Mux().Protocols()
return snapshot
ids.currentSnapshot.Lock()
snapshot.seq = ids.currentSnapshot.snapshot.seq + 1
ids.currentSnapshot.snapshot = snapshot
ids.currentSnapshot.Unlock()
log.Debugw("updating snapshot", "seq", snapshot.seq, "addrs", snapshot.addrs)
}
func (ids *idService) writeChunkedIdentifyMsg(c network.Conn, s network.Stream) error {
snapshot := ids.getSnapshot()
func (ids *idService) writeChunkedIdentifyMsg(s network.Stream, snapshot *identifySnapshot) error {
c := s.Conn()
log.Debugw("sending snapshot", "seq", snapshot.seq, "protocols", snapshot.protocols, "addrs", snapshot.addrs)
mes := ids.createBaseIdentifyResponse(c, snapshot)
sr := ids.getSignedRecord(snapshot)
mes.SignedPeerRecord = sr
@ -480,21 +528,16 @@ func (ids *idService) writeChunkedIdentifyMsg(c network.Conn, s network.Stream)
if sr == nil || proto.Size(mes) <= legacyIDSize {
return writer.WriteMsg(mes)
}
mes.SignedPeerRecord = nil
if err := writer.WriteMsg(mes); err != nil {
return err
}
// then write just the signed record
m := &pb.Identify{SignedPeerRecord: sr}
err := writer.WriteMsg(m)
return err
return writer.WriteMsg(&pb.Identify{SignedPeerRecord: sr})
}
func (ids *idService) createBaseIdentifyResponse(
conn network.Conn,
snapshot *identifySnapshot,
) *pb.Identify {
func (ids *idService) createBaseIdentifyResponse(conn network.Conn, snapshot *identifySnapshot) *pb.Identify {
mes := &pb.Identify{}
remoteAddr := conn.RemoteMultiaddr()
@ -805,38 +848,41 @@ func signedPeerRecordFromMessage(msg *pb.Identify) (*record.Envelope, error) {
return env, err
}
// netNotifiee defines methods to be used with the IpfsDHT
// netNotifiee defines methods to be used with the swarm
type netNotifiee idService
func (nn *netNotifiee) IDService() *idService {
return (*idService)(nn)
}
func (nn *netNotifiee) Connected(n network.Network, v network.Conn) {
nn.IDService().IdentifyWait(v)
func (nn *netNotifiee) Connected(_ network.Network, c network.Conn) {
// We rely on this notification being received before we receive any incoming streams on the connection.
// The swarm implementation guarantees this.
ids := nn.IDService()
<-ids.setupCompleted
ids.connsMu.Lock()
ids.conns[c] = entry{}
ids.connsMu.Unlock()
nn.IDService().IdentifyWait(c)
}
func (nn *netNotifiee) Disconnected(n network.Network, v network.Conn) {
func (nn *netNotifiee) Disconnected(_ network.Network, c network.Conn) {
ids := nn.IDService()
// Stop tracking the connection.
ids.removeConn(v)
// undo the setting of addresses to peer.ConnectedAddrTTL we did
ids.addrMu.Lock()
defer ids.addrMu.Unlock()
if ids.Host.Network().Connectedness(v.RemotePeer()) != network.Connected {
// consider removing the peer handler for this
select {
case ids.rmPeerHandlerCh <- rmPeerHandlerReq{v.RemotePeer()}:
case <-ids.ctx.Done():
return
}
ids.connsMu.Lock()
delete(ids.conns, c)
ids.connsMu.Unlock()
if ids.Host.Network().Connectedness(c.RemotePeer()) != network.Connected {
// Last disconnect.
ps := ids.Host.Peerstore()
ps.UpdateAddrs(v.RemotePeer(), peerstore.ConnectedAddrTTL, peerstore.RecentlyConnectedAddrTTL)
// Undo the setting of addresses to peer.ConnectedAddrTTL we did
ids.addrMu.Lock()
defer ids.addrMu.Unlock()
ids.Host.Peerstore().UpdateAddrs(c.RemotePeer(), peerstore.ConnectedAddrTTL, peerstore.RecentlyConnectedAddrTTL)
}
}

3
p2p/protocol/identify/id_glass_test.go
View File

@ -25,6 +25,7 @@ func TestFastDisconnect(t *testing.T) {
ids, err := NewIDService(target)
require.NoError(t, err)
defer ids.Close()
ids.Start()
sync := make(chan struct{})
target.SetStreamHandler(ID, func(s network.Stream) {
@ -50,7 +51,7 @@ func TestFastDisconnect(t *testing.T) {
// This should not block indefinitely, or panic, or anything like that.
//
// However, if we have a bug, that _could_ happen.
ids.sendIdentifyResp(s)
ids.handleIdentifyRequest(s)
// Ok, allow the outer test to continue.
select {

14
p2p/protocol/identify/id_push.go
View File

@ -1,14 +0,0 @@
package identify
import (
"github.com/libp2p/go-libp2p/core/network"
)
// IDPush is the protocol.ID of the Identify push protocol.
// It sends full identify messages containing the current state of the peer.
const IDPush = "/ipfs/id/push/1.0.0"
// pushHandler handles incoming identify push streams. The behaviour is identical to the ordinary identify protocol.
func (ids *idService) pushHandler(s network.Stream) {
ids.handleIdentifyResponse(s, true)
}

43
p2p/protocol/identify/id_test.go
View File

@ -165,10 +165,12 @@ func TestIDService(t *testing.T) {
ids1, err := identify.NewIDService(h1)
require.NoError(t, err)
defer ids1.Close()
ids1.Start()
ids2, err := identify.NewIDService(h2)
require.NoError(t, err)
defer ids2.Close()
ids2.Start()
sub, err := ids1.Host.EventBus().Subscribe(new(event.EvtPeerIdentificationCompleted))
if err != nil {
@ -322,12 +324,15 @@ func TestLocalhostAddrFiltering(t *testing.T) {
ids1, err := identify.NewIDService(p1)
require.NoError(t, err)
ids1.Start()
ids2, err := identify.NewIDService(p2)
require.NoError(t, err)
ids2.Start()
ids3, err := identify.NewIDService(p3)
require.NoError(t, err)
ids3.Start()
defer func() {
ids1.Close()
@ -360,6 +365,7 @@ func TestLocalhostAddrFiltering(t *testing.T) {
// TestIdentifyPushWhileIdentifyingConn tests that the host waits to push updates if an identify is ongoing.
func TestIdentifyPushWhileIdentifyingConn(t *testing.T) {
t.Skip()
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
@ -367,12 +373,16 @@ func TestIdentifyPushWhileIdentifyingConn(t *testing.T) {
h2 := blhost.NewBlankHost(swarmt.GenSwarm(t))
defer h2.Close()
defer h1.Close()
t.Log("h1:", h1.ID())
t.Log("h2:", h2.ID())
ids1, err := identify.NewIDService(h1)
require.NoError(t, err)
ids1.Start()
ids2, err := identify.NewIDService(h2)
require.NoError(t, err)
ids2.Start()
defer ids1.Close()
defer ids2.Close()
@ -440,11 +450,13 @@ func TestIdentifyPushOnAddrChange(t *testing.T) {
ids1, err := identify.NewIDService(h1)
require.NoError(t, err)
defer ids1.Close()
ids1.Start()
ids2, err := identify.NewIDService(h2)
require.NoError(t, err)
defer ids1.Close()
defer ids2.Close()
ids2.Start()
testKnowsAddrs(t, h1, h2p, []ma.Multiaddr{}) // nothing
testKnowsAddrs(t, h2, h1p, []ma.Multiaddr{}) // nothing
@ -568,14 +580,13 @@ func TestSendPush(t *testing.T) {
ids1, err := identify.NewIDService(h1)
require.NoError(t, err)
defer ids1.Close()
ids1.Start()
ids2, err := identify.NewIDService(h2)
require.NoError(t, err)
defer func() {
ids1.Close()
ids2.Close()
}()
defer ids2.Close()
ids2.Start()
err = h1.Connect(ctx, peer.AddrInfo{ID: h2.ID(), Addrs: h2.Addrs()})
require.NoError(t, err)
@ -624,10 +635,12 @@ func TestLargeIdentifyMessage(t *testing.T) {
ids1, err := identify.NewIDService(h1)
require.NoError(t, err)
defer ids1.Close()
ids1.Start()
ids2, err := identify.NewIDService(h2)
require.NoError(t, err)
defer ids2.Close()
ids2.Start()
sub, err := ids1.Host.EventBus().Subscribe(new(event.EvtPeerIdentificationCompleted))
require.NoError(t, err)
@ -729,12 +742,13 @@ func TestLargePushMessage(t *testing.T) {
ids1, err := identify.NewIDService(h1)
require.NoError(t, err)
defer ids1.Close()
ids1.Start()
ids2, err := identify.NewIDService(h2)
require.NoError(t, err)
defer ids1.Close()
defer ids2.Close()
ids2.Start()
testKnowsAddrs(t, h1, h2p, []ma.Multiaddr{}) // nothing
testKnowsAddrs(t, h2, h1p, []ma.Multiaddr{}) // nothing
@ -805,12 +819,14 @@ func TestIdentifyResponseReadTimeout(t *testing.T) {
h2p := h2.ID()
ids1, err := identify.NewIDService(h1)
require.NoError(t, err)
defer ids1.Close()
ids1.Start()
ids2, err := identify.NewIDService(h2)
require.NoError(t, err)
defer ids1.Close()
defer ids2.Close()
ids2.Start()
// remote stream handler will just hang and not send back an identify response
h2.SetStreamHandler(identify.ID, func(s network.Stream) {
time.Sleep(100 * time.Second)
@ -851,12 +867,13 @@ func TestIncomingIDStreamsTimeout(t *testing.T) {
ids1, err := identify.NewIDService(h1)
require.NoError(t, err)
defer ids1.Close()
ids1.Start()
ids2, err := identify.NewIDService(h2)
require.NoError(t, err)
defer ids1.Close()
defer ids2.Close()
ids2.Start()
h2p := h2.ID()
h2pi := h2.Peerstore().PeerInfo(h2p)

131
p2p/protocol/identify/peer_loop.go
View File

@ -1,131 +0,0 @@
package identify
import (
"context"
"errors"
"fmt"
"time"
"github.com/libp2p/go-libp2p/core/network"
"github.com/libp2p/go-libp2p/core/peer"
"github.com/libp2p/go-libp2p/core/protocol"
"github.com/libp2p/go-libp2p/core/record"
ma "github.com/multiformats/go-multiaddr"
)
var errProtocolNotSupported = errors.New("protocol not supported")
type identifySnapshot struct {
protocols []protocol.ID
addrs []ma.Multiaddr
record *record.Envelope
}
type peerHandler struct {
ids *idService
cancel context.CancelFunc
pid peer.ID
pushCh chan struct{}
}
func newPeerHandler(pid peer.ID, ids *idService) *peerHandler {
return &peerHandler{
ids: ids,
pid: pid,
pushCh: make(chan struct{}, 1),
}
}
// start starts a handler. This may only be called on a stopped handler, and must
// not be called concurrently with start/stop.
//
// This may _not_ be called on a _canceled_ handler. I.e., a handler where the
// passed in context expired.
func (ph *peerHandler) start(ctx context.Context, onExit func()) {
if ph.cancel != nil {
// If this happens, we have a bug. It means we tried to start
// before we stopped.
panic("peer handler already running")
}
ctx, cancel := context.WithCancel(ctx)
ph.cancel = cancel
go func() {
ph.loop(ctx)
onExit()
}()
}
// stop stops a handler. This may not be called concurrently with any
// other calls to stop/start.
func (ph *peerHandler) stop() error {
if ph.cancel != nil {
ph.cancel()
ph.cancel = nil
}
return nil
}
// per peer loop for pushing updates
func (ph *peerHandler) loop(ctx context.Context) {
for {
select {
// our listen addresses have changed, send an IDPush.
case <-ph.pushCh:
if err := ph.sendPush(ctx); err != nil {
log.Warnw("failed to send Identify Push", "peer", ph.pid, "error", err)
}
case <-ctx.Done():
return
}
}
}
func (ph *peerHandler) sendPush(ctx context.Context) error {
dp, err := ph.openStream(ctx, IDPush)
if err == errProtocolNotSupported {
log.Debugw("not sending push as peer does not support protocol", "peer", ph.pid)
return nil
}
if err != nil {
return fmt.Errorf("failed to open push stream: %w", err)
}
defer dp.Close()
if err := ph.ids.writeChunkedIdentifyMsg(dp.Conn(), dp); err != nil {
_ = dp.Reset()
return fmt.Errorf("failed to send push message: %w", err)
}
return nil
}
func (ph *peerHandler) openStream(ctx context.Context, proto protocol.ID) (network.Stream, error) {
// wait for the other peer to send us an Identify response on "all" connections we have with it
// so we can look at it's supported protocols and avoid a multistream-select roundtrip to negotiate the protocol
// if we know for a fact that it doesn't support the protocol.
conns := ph.ids.Host.Network().ConnsToPeer(ph.pid)
for _, c := range conns {
select {
case <-ph.ids.IdentifyWait(c):
case <-ctx.Done():
return nil, ctx.Err()
}
}
if sup, err := ph.ids.Host.Peerstore().SupportsProtocols(ph.pid, proto); err != nil || len(sup) == 0 {
return nil, errProtocolNotSupported
}
ph.ids.pushSemaphore <- struct{}{}
defer func() {
<-ph.ids.pushSemaphore
}()
// negotiate a stream without opening a new connection as we "should" already have a connection.
ctx, cancel := context.WithTimeout(network.WithNoDial(ctx, "should already have connection"), 30*time.Second)
defer cancel()
return ph.ids.Host.NewStream(ctx, ph.pid, proto)
}

41
p2p/protocol/identify/peer_loop_test.go
View File

@ -1,41 +0,0 @@
package identify
import (
"context"
"testing"
"time"
blhost "github.com/libp2p/go-libp2p/p2p/host/blank"
swarmt "github.com/libp2p/go-libp2p/p2p/net/swarm/testing"
"github.com/stretchr/testify/require"
)
func TestHandlerClose(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
h1 := blhost.NewBlankHost(swarmt.GenSwarm(t))
defer h1.Close()
ids1, err := NewIDService(h1)
require.NoError(t, err)
ph := newPeerHandler(h1.ID(), ids1)
closedCh := make(chan struct{}, 2)
ph.start(ctx, func() {
closedCh <- struct{}{}
})
require.NoError(t, ph.stop())
select {
case <-closedCh:
case <-time.After(time.Second):
t.Fatal("expected the handler to close")
}
require.NoError(t, ph.stop())
select {
case <-closedCh:
t.Fatal("expected only one close event")
case <-time.After(10 * time.Millisecond):
}
}

16
p2p/test/reconnects/reconnect_test.go
View File

@ -11,7 +11,6 @@ import (
"github.com/libp2p/go-libp2p/core/host"
"github.com/libp2p/go-libp2p/core/network"
"github.com/libp2p/go-libp2p/core/peer"
"github.com/libp2p/go-libp2p/core/protocol"
bhost "github.com/libp2p/go-libp2p/p2p/host/basic"
swarmt "github.com/libp2p/go-libp2p/p2p/net/swarm/testing"
@ -60,17 +59,11 @@ func TestReconnect5(t *testing.T) {
}
func runRound(t *testing.T, hosts []host.Host) {
for _, h := range hosts {
h.SetStreamHandler(protocol.TestingID, EchoStreamHandler)
}
// connect all hosts
for _, h1 := range hosts {
h1.SetStreamHandler(protocol.TestingID, EchoStreamHandler)
for _, h2 := range hosts {
if h1.ID() >= h2.ID() {
continue
}
require.NoError(t, h1.Connect(context.Background(), peer.AddrInfo{ID: h2.ID(), Addrs: h2.Peerstore().Addrs(h2.ID())}))
h1.Peerstore().AddAddrs(h2.ID(), h2.Addrs(), time.Hour)
}
}
@ -107,9 +100,6 @@ func runRound(t *testing.T, hosts []host.Host) {
// close connection
cs := h1.Network().Conns()
for _, c := range cs {
if c.LocalPeer() > c.RemotePeer() {
continue
}
c.Close()
}
}