package peers import ( "encoding/json" "fmt" "net" "strconv" "testing" "time" "github.com/ethereum/go-ethereum/common" "github.com/ethereum/go-ethereum/crypto" "github.com/ethereum/go-ethereum/p2p" "github.com/ethereum/go-ethereum/p2p/discv5" "github.com/ethereum/go-ethereum/p2p/enode" lcrypto "github.com/libp2p/go-libp2p-crypto" ma "github.com/multiformats/go-multiaddr" "github.com/stretchr/testify/assert" "github.com/stretchr/testify/require" "github.com/stretchr/testify/suite" "github.com/syndtr/goleveldb/leveldb" "github.com/syndtr/goleveldb/leveldb/storage" "github.com/status-im/rendezvous/server" "github.com/status-im/status-go/discovery" "github.com/status-im/status-go/params" "github.com/status-im/status-go/signal" whisper "github.com/status-im/whisper/whisperv6" ) type PeerPoolSimulationSuite struct { suite.Suite bootnode *p2p.Server peers []*p2p.Server discovery []discovery.Discovery port uint16 rendezvousServer *server.Server } func TestPeerPoolSimulationSuite(t *testing.T) { s := new(PeerPoolSimulationSuite) s.port = 33731 suite.Run(t, s) } func (s *PeerPoolSimulationSuite) nextPort() uint16 { s.port++ return s.port } func (s *PeerPoolSimulationSuite) SetupTest() { bootnodePort := s.nextPort() key, _ := crypto.GenerateKey() name := common.MakeName("bootnode", "1.0") // 127.0.0.1 is invalidated by discovery v5 s.bootnode = &p2p.Server{ Config: p2p.Config{ MaxPeers: 10, Name: name, ListenAddr: fmt.Sprintf("0.0.0.0:%d", bootnodePort), PrivateKey: key, DiscoveryV5: true, NoDiscovery: true, }, } s.Require().NoError(s.bootnode.Start()) bootnodeV5 := discv5.NewNode(s.bootnode.DiscV5.Self().ID, net.ParseIP("127.0.0.1"), bootnodePort, bootnodePort) // 1 peer to initiate connection, 1 peer as a first candidate, 1 peer - for failover s.peers = make([]*p2p.Server, 3) s.discovery = make([]discovery.Discovery, 3) for i := range s.peers { key, _ := crypto.GenerateKey() whisper := whisper.New(nil) peer := &p2p.Server{ Config: p2p.Config{ MaxPeers: 10, Name: common.MakeName("peer-"+strconv.Itoa(i), "1.0"), ListenAddr: fmt.Sprintf("0.0.0.0:%d", s.nextPort()), PrivateKey: key, NoDiscovery: true, BootstrapNodesV5: []*discv5.Node{bootnodeV5}, Protocols: whisper.Protocols(), }, } s.NoError(peer.Start()) s.peers[i] = peer } } func (s *PeerPoolSimulationSuite) setupEthV5() { for i := range s.peers { peer := s.peers[i] d := discovery.NewDiscV5(peer.PrivateKey, peer.ListenAddr, peer.BootstrapNodesV5) s.NoError(d.Start()) s.discovery[i] = d } } func (s *PeerPoolSimulationSuite) setupRendezvous() { priv, _, err := lcrypto.GenerateKeyPair(lcrypto.Secp256k1, 0) s.Require().NoError(err) laddr, err := ma.NewMultiaddr(fmt.Sprintf("/ip4/127.0.0.1/tcp/7777")) s.Require().NoError(err) db, err := leveldb.Open(storage.NewMemStorage(), nil) s.Require().NoError(err) s.rendezvousServer = server.NewServer(laddr, priv, server.NewStorage(db)) s.Require().NoError(s.rendezvousServer.Start()) for i := range s.peers { peer := s.peers[i] d, err := discovery.NewRendezvous([]ma.Multiaddr{s.rendezvousServer.Addr()}, peer.PrivateKey, peer.Self()) s.NoError(err) s.NoError(d.Start()) s.discovery[i] = d } } func (s *PeerPoolSimulationSuite) TearDown() { s.bootnode.Stop() for i := range s.peers { s.peers[i].Stop() s.NoError(s.discovery[i].Stop()) } if s.rendezvousServer != nil { s.rendezvousServer.Stop() } } func (s *PeerPoolSimulationSuite) getPeerFromEvent(events <-chan *p2p.PeerEvent, etype p2p.PeerEventType) (nodeID enode.ID) { select { case ev := <-events: if ev.Type == etype { return ev.Peer } s.Failf("invalid event", "expected %s but got %s for peer %s", etype, ev.Type, ev.Peer) case <-time.After(10 * time.Second): s.Fail("timed out waiting for a peer") return } return } func (s *PeerPoolSimulationSuite) getPoolEvent(events <-chan string) string { select { case ev := <-events: return ev case <-time.After(10 * time.Second): s.FailNow("timed out waiting a pool event") return "" } } func (s *PeerPoolSimulationSuite) TestPeerPoolCacheEthV5() { s.setupEthV5() var err error topic := discv5.Topic("cap=test") config := map[discv5.Topic]params.Limits{ topic: params.NewLimits(1, 1), } peerPoolOpts := &Options{100 * time.Millisecond, 100 * time.Millisecond, 0, true, 100 * time.Millisecond, nil, ""} cache, err := newInMemoryCache() s.Require().NoError(err) peerPool := NewPeerPool(s.discovery[1], config, cache, peerPoolOpts) // start peer pool s.Require().NoError(peerPool.Start(s.peers[1], nil)) defer peerPool.Stop() // check if cache is passed to topic pools for _, topicPool := range peerPool.topics { tp := topicPool.(*TopicPool) s.Equal(cache, tp.cache) } } func (s *PeerPoolSimulationSuite) TestSingleTopicDiscoveryWithFailoverEthV5() { s.T().Skip("Skipping due to being flaky") s.setupEthV5() s.singleTopicDiscoveryWithFailover() } func (s *PeerPoolSimulationSuite) TestSingleTopicDiscoveryWithFailoverRendezvous() { s.setupRendezvous() s.singleTopicDiscoveryWithFailover() } func (s *PeerPoolSimulationSuite) singleTopicDiscoveryWithFailover() { var err error // Buffered channels must be used because we expect the events // to be in the same order. Use a buffer length greater than // the expected number of events to avoid deadlock. poolEvents := make(chan string, 10) summaries := make(chan []*p2p.PeerInfo, 10) signal.SetDefaultNodeNotificationHandler(func(jsonEvent string) { var envelope struct { Type string Event json.RawMessage } s.NoError(json.Unmarshal([]byte(jsonEvent), &envelope)) switch typ := envelope.Type; typ { case signal.EventDiscoveryStarted, signal.EventDiscoveryStopped: poolEvents <- envelope.Type case signal.EventDiscoverySummary: poolEvents <- envelope.Type var summary []*p2p.PeerInfo s.NoError(json.Unmarshal(envelope.Event, &summary)) summaries <- summary } }) defer signal.ResetDefaultNodeNotificationHandler() topic := discv5.Topic("cap=test") // simulation should only rely on fast sync config := map[discv5.Topic]params.Limits{ topic: params.NewLimits(1, 1), // limits are chosen for simplicity of the simulation } peerPoolOpts := &Options{100 * time.Millisecond, 100 * time.Millisecond, 0, true, 0, nil, ""} cache, err := newInMemoryCache() s.Require().NoError(err) peerPool := NewPeerPool(s.discovery[1], config, cache, peerPoolOpts) // create and start topic registry register := NewRegister(s.discovery[0], topic) s.Require().NoError(register.Start()) // subscribe for peer events before starting the peer pool events := make(chan *p2p.PeerEvent, 20) subscription := s.peers[1].SubscribeEvents(events) defer subscription.Unsubscribe() // start the peer pool s.Require().NoError(peerPool.Start(s.peers[1], nil)) defer peerPool.Stop() s.Equal(signal.EventDiscoveryStarted, s.getPoolEvent(poolEvents)) // wait for the peer to be found and connected connectedPeer := s.getPeerFromEvent(events, p2p.PeerEventTypeAdd) s.Equal(s.peers[0].Self().ID(), connectedPeer) // as the upper limit was reached, Discovery should be stoped s.Equal(signal.EventDiscoverySummary, s.getPoolEvent(poolEvents)) s.Equal(signal.EventDiscoveryStopped, s.getPoolEvent(poolEvents)) s.Len(<-summaries, 1) // stop topic register and the connected peer register.Stop() s.peers[0].Stop() disconnectedPeer := s.getPeerFromEvent(events, p2p.PeerEventTypeDrop) s.Equal(connectedPeer, disconnectedPeer) s.Equal(signal.EventDiscoverySummary, s.getPoolEvent(poolEvents)) s.Len(<-summaries, 0) // Discovery should be restarted because the number of peers dropped // below the lower limit. s.Equal(signal.EventDiscoveryStarted, s.getPoolEvent(poolEvents)) // register the second peer register = NewRegister(s.discovery[2], topic) s.Require().NoError(register.Start()) defer register.Stop() s.Equal(s.peers[2].Self().ID(), s.getPeerFromEvent(events, p2p.PeerEventTypeAdd)) // Discovery can be stopped again. s.Require().Equal(signal.EventDiscoverySummary, s.getPoolEvent(poolEvents)) s.Equal(signal.EventDiscoveryStopped, s.getPoolEvent(poolEvents)) s.Len(<-summaries, 1) } // TestPeerPoolMaxPeersOverflow verifies that following scenario will not occur: // - found peer A and B in the same kademlia cycle // - process peer A // - max limit is reached -> closed discv5 and set it to nil // - process peer B // - panic because discv5 is nil!!! func TestPeerPoolMaxPeersOverflow(t *testing.T) { maxCachedPeersMultiplier = 0 signals := make(chan string, 10) signal.SetDefaultNodeNotificationHandler(func(jsonEvent string) { var envelope struct { Type string } require.NoError(t, json.Unmarshal([]byte(jsonEvent), &envelope)) signals <- envelope.Type }) defer signal.ResetDefaultNodeNotificationHandler() key, err := crypto.GenerateKey() require.NoError(t, err) peer := &p2p.Server{ Config: p2p.Config{ PrivateKey: key, NoDiscovery: true, }, } require.NoError(t, peer.Start()) defer peer.Stop() discovery := discovery.NewDiscV5(key, peer.ListenAddr, nil) require.NoError(t, discovery.Start()) defer func() { assert.NoError(t, discovery.Stop()) }() require.True(t, discovery.Running()) poolOpts := &Options{DefaultFastSync, DefaultSlowSync, 0, true, 100 * time.Millisecond, nil, ""} pool := NewPeerPool(discovery, nil, nil, poolOpts) require.NoError(t, pool.Start(peer, nil)) require.Equal(t, signal.EventDiscoveryStarted, <-signals) // without config, it will stop the discovery because all topic pools are satisfied pool.events <- &p2p.PeerEvent{Type: p2p.PeerEventTypeAdd} require.Equal(t, signal.EventDiscoverySummary, <-signals) require.Equal(t, signal.EventDiscoveryStopped, <-signals) require.False(t, discovery.Running()) // another peer added after discovery is stopped should not panic pool.events <- &p2p.PeerEvent{Type: p2p.PeerEventTypeAdd} } func TestPeerPoolDiscV5Timeout(t *testing.T) { signals := make(chan string) signal.SetDefaultNodeNotificationHandler(func(jsonEvent string) { var envelope struct { Type string Event json.RawMessage } require.NoError(t, json.Unmarshal([]byte(jsonEvent), &envelope)) // Send signal asynchronously to avoid blocking. // It's better than sending to a buffered channel because // it won't ever block, for example, if two events were expected // but received more. // In this case, a strange PeerEventTypeDrop event was emitted. go func() { switch typ := envelope.Type; typ { case signal.EventDiscoveryStarted, signal.EventDiscoveryStopped: signals <- envelope.Type } }() }) defer signal.ResetDefaultNodeNotificationHandler() // start server key, err := crypto.GenerateKey() require.NoError(t, err) server := &p2p.Server{ Config: p2p.Config{ PrivateKey: key, NoDiscovery: true, }, } require.NoError(t, server.Start()) defer server.Stop() discovery := discovery.NewDiscV5(key, server.ListenAddr, nil) require.NoError(t, discovery.Start()) defer func() { assert.NoError(t, discovery.Stop()) }() require.True(t, discovery.Running()) // start PeerPool poolOpts := &Options{DefaultFastSync, DefaultSlowSync, time.Millisecond * 100, true, 100 * time.Millisecond, nil, ""} pool := NewPeerPool(discovery, nil, nil, poolOpts) require.NoError(t, pool.Start(server, nil)) require.Equal(t, signal.EventDiscoveryStarted, <-signals) // timeout after finding no peers select { case sig := <-signals: require.Equal(t, signal.EventDiscoveryStopped, sig) case <-time.After(pool.opts.DiscServerTimeout * 2): t.Fatal("timed out") } require.False(t, discovery.Running()) // timeout after discovery restart require.NoError(t, pool.restartDiscovery(server)) require.Equal(t, signal.EventDiscoveryStarted, <-signals) require.True(t, discovery.Running()) pool.events <- &p2p.PeerEvent{Type: p2p.PeerEventTypeDrop} // required to turn the loop and pick up new timeout select { case sig := <-signals: require.Equal(t, signal.EventDiscoveryStopped, sig) case <-time.After(pool.opts.DiscServerTimeout * 2): t.Fatal("timed out") } require.False(t, discovery.Running()) } func TestPeerPoolNotAllowedStopping(t *testing.T) { // create and start server key, err := crypto.GenerateKey() require.NoError(t, err) server := &p2p.Server{ Config: p2p.Config{ PrivateKey: key, NoDiscovery: true, }, } require.NoError(t, server.Start()) defer server.Stop() discovery := discovery.NewDiscV5(key, server.ListenAddr, nil) require.NoError(t, discovery.Start()) defer func() { assert.NoError(t, discovery.Stop()) }() require.True(t, discovery.Running()) // start PeerPool poolOpts := &Options{DefaultFastSync, DefaultSlowSync, time.Millisecond * 100, false, 100 * time.Millisecond, nil, ""} pool := NewPeerPool(discovery, nil, nil, poolOpts) require.NoError(t, pool.Start(server, nil)) // wait 2x timeout duration <-time.After(pool.opts.DiscServerTimeout * 2) require.True(t, discovery.Running()) } func (s *PeerPoolSimulationSuite) TestUpdateTopicLimits() { s.setupEthV5() var err error topic := discv5.Topic("cap=test") config := map[discv5.Topic]params.Limits{ topic: params.NewLimits(1, 1), } peerPoolOpts := &Options{100 * time.Millisecond, 100 * time.Millisecond, 0, true, 100 * time.Millisecond, nil, ""} cache, err := newInMemoryCache() s.Require().NoError(err) peerPool := NewPeerPool(s.discovery[1], config, cache, peerPoolOpts) // start peer pool s.Require().NoError(peerPool.Start(s.peers[1], nil)) defer peerPool.Stop() for _, topicPool := range peerPool.topics { tp := topicPool.(*TopicPool) s.Equal(1, tp.limits.Max) s.Equal(1, tp.limits.Min) } // Updating TopicPool's limits err = peerPool.UpdateTopic("cap=test", params.NewLimits(5, 10)) s.Require().NoError(err) time.Sleep(1 * time.Millisecond) for _, topicPool := range peerPool.topics { tp := topicPool.(*TopicPool) tp.mu.RLock() defer tp.mu.RUnlock() s.Equal(10, tp.limits.Max) s.Equal(5, tp.limits.Min) } } func (s *PeerPoolSimulationSuite) TestMailServerPeersDiscovery() { s.setupEthV5() // eliminate peer we won't use s.peers[2].Stop() // Buffered channels must be used because we expect the events // to be in the same order. Use a buffer length greater than // the expected number of events to avoid deadlock. poolEvents := make(chan string, 10) summaries := make(chan []*p2p.PeerInfo, 10) signal.SetDefaultNodeNotificationHandler(func(jsonEvent string) { var envelope struct { Type string Event json.RawMessage } s.NoError(json.Unmarshal([]byte(jsonEvent), &envelope)) switch typ := envelope.Type; typ { case signal.EventDiscoverySummary: poolEvents <- envelope.Type var summary []*p2p.PeerInfo s.NoError(json.Unmarshal(envelope.Event, &summary)) summaries <- summary } }) defer signal.ResetDefaultNodeNotificationHandler() // subscribe for peer events before starting the peer pool events := make(chan *p2p.PeerEvent, 20) subscription := s.peers[1].SubscribeEvents(events) defer subscription.Unsubscribe() // create and start topic registry register := NewRegister(s.discovery[0], MailServerDiscoveryTopic) s.Require().NoError(register.Start()) // create and start peer pool config := map[discv5.Topic]params.Limits{ MailServerDiscoveryTopic: params.NewLimits(1, 1), } cache, err := newInMemoryCache() s.Require().NoError(err) peerPoolOpts := &Options{ 100 * time.Millisecond, 100 * time.Millisecond, 0, true, 100 * time.Millisecond, []enode.ID{s.peers[0].Self().ID()}, "", } peerPool := NewPeerPool(s.discovery[1], config, cache, peerPoolOpts) s.Require().NoError(peerPool.Start(s.peers[1], nil)) defer peerPool.Stop() // wait for and verify the mail server peer connectedPeer := s.getPeerFromEvent(events, p2p.PeerEventTypeAdd) s.Equal(s.peers[0].Self().ID().String(), connectedPeer.String()) // wait for a summary event to be sure that ConfirmAdded() was called s.Equal(signal.EventDiscoverySummary, s.getPoolEvent(poolEvents)) s.Equal(s.peers[0].Self().ID().String(), (<-summaries)[0].ID) // check cache cachedPeers := peerPool.cache.GetPeersRange(MailServerDiscoveryTopic, 5) s.Require().Len(cachedPeers, 1) s.Equal(discv5.PubkeyID(s.peers[0].Self().Pubkey()), cachedPeers[0].ID) // wait for another event as the peer should be removed disconnectedPeer := s.getPeerFromEvent(events, p2p.PeerEventTypeDrop) s.Equal(s.peers[0].Self().ID().String(), disconnectedPeer.String()) s.Equal(signal.EventDiscoverySummary, s.getPoolEvent(poolEvents)) }