Merge pull request #2118 from nspcc-dev/neopt2

Networking improvements

pkg/network/server.go

@@ -68,11 +68,15 @@ type (
 		chain             blockchainer.Blockchainer
 		bQueue            *blockQueue
 		consensus         consensus.Service
+		mempool           *mempool.Pool
 		notaryRequestPool *mempool.Pool
 		extensiblePool    *extpool.Pool
 		notaryFeer        NotaryFeer
 		notaryModule      *notary.Notary
 
+		txInLock sync.Mutex
+		txInMap  map[util.Uint256]struct{}
+
 		lock  sync.RWMutex
 		peers map[Peer]bool
 
@@ -136,8 +140,10 @@ func newServerFromConstructors(config ServerConfig, chain blockchainer.Blockchai
 		quit:              make(chan struct{}),
 		register:          make(chan Peer),
 		unregister:        make(chan peerDrop),
+		txInMap:           make(map[util.Uint256]struct{}),
 		peers:             make(map[Peer]bool),
 		syncReached:       atomic.NewBool(false),
+		mempool:           chain.GetMemPool(),
 		extensiblePool:    extpool.New(chain, config.ExtensiblePoolSize),
 		log:               log,
 		transactions:      make(chan *transaction.Transaction, 64),
@@ -282,7 +288,7 @@ func (s *Server) Shutdown() {
 	s.transport.Close()
 	s.discovery.Close()
 	s.consensus.Shutdown()
-	for p := range s.Peers() {
+	for _, p := range s.getPeers(nil) {
 		p.Disconnect(errServerShutdown)
 	}
 	s.bQueue.discard()
@@ -425,7 +431,7 @@ func (s *Server) runProto() {
 		case <-pingTimer.C:
 			if s.chain.BlockHeight() == prevHeight {
 				// Get a copy of s.peers to avoid holding a lock while sending.
-				for peer := range s.Peers() {
+				for _, peer := range s.getPeers(nil) {
 					_ = peer.SendPing(NewMessage(CMDPing, payload.NewPing(s.chain.BlockHeight(), s.id)))
 				}
 			}
@@ -483,15 +489,18 @@ func (s *Server) UnsubscribeFromNotaryRequests(ch chan<- mempoolevent.Event) {
 	s.notaryRequestPool.UnsubscribeFromTransactions(ch)
 }
 
-// Peers returns the current list of peers connected to
-// the server.
-func (s *Server) Peers() map[Peer]bool {
+// getPeers returns current list of peers connected to the server filtered by
+// isOK function if it's given.
+func (s *Server) getPeers(isOK func(Peer) bool) []Peer {
 	s.lock.RLock()
 	defer s.lock.RUnlock()
 
-	peers := make(map[Peer]bool, len(s.peers))
-	for k, v := range s.peers {
-		peers[k] = v
+	peers := make([]Peer, 0, len(s.peers))
+	for k := range s.peers {
+		if isOK != nil && !isOK(k) {
+			continue
+		}
+		peers = append(peers, k)
 	}
 
 	return peers
@@ -655,7 +664,7 @@ func (s *Server) handlePong(p Peer, pong *payload.Ping) error {
 func (s *Server) handleInvCmd(p Peer, inv *payload.Inventory) error {
 	reqHashes := make([]util.Uint256, 0)
 	var typExists = map[payload.InventoryType]func(util.Uint256) bool{
-		payload.TXType:    s.chain.HasTransaction,
+		payload.TXType:    s.mempool.ContainsKey,
 		payload.BlockType: s.chain.HasBlock,
 		payload.ExtensibleType: func(h util.Uint256) bool {
 			cp := s.extensiblePool.Get(h)
@@ -688,7 +697,7 @@ func (s *Server) handleInvCmd(p Peer, inv *payload.Inventory) error {
 
 // handleMempoolCmd handles getmempool command.
 func (s *Server) handleMempoolCmd(p Peer) error {
-	txs := s.chain.GetMemPool().GetVerifiedTransactions()
+	txs := s.mempool.GetVerifiedTransactions()
 	hs := make([]util.Uint256, 0, payload.MaxHashesCount)
 	for i := range txs {
 		hs = append(hs, txs[i].Hash())
@@ -874,10 +883,21 @@ func (s *Server) handleExtensibleCmd(e *payload.Extensible) error {
 func (s *Server) handleTxCmd(tx *transaction.Transaction) error {
 	// It's OK for it to fail for various reasons like tx already existing
 	// in the pool.
+	s.txInLock.Lock()
+	_, ok := s.txInMap[tx.Hash()]
+	if ok || s.mempool.ContainsKey(tx.Hash()) {
+		s.txInLock.Unlock()
+		return nil
+	}
+	s.txInMap[tx.Hash()] = struct{}{}
+	s.txInLock.Unlock()
 	if s.verifyAndPoolTX(tx) == nil {
 		s.consensus.OnTransaction(tx)
 		s.broadcastTX(tx, nil)
 	}
+	s.txInLock.Lock()
+	delete(s.txInMap, tx.Hash())
+	s.txInLock.Unlock()
 	return nil
 }
 
@@ -1124,54 +1144,49 @@ func (s *Server) requestTx(hashes ...util.Uint256) {
 // passed, one is to send the message and the other is to filtrate peers (the
 // peer is considered invalid if it returns false).
 func (s *Server) iteratePeersWithSendMsg(msg *Message, send func(Peer, bool, []byte) error, peerOK func(Peer) bool) {
+	var deadN, peerN, sentN int
+
 	// Get a copy of s.peers to avoid holding a lock while sending.
-	peers := s.Peers()
-	if len(peers) == 0 {
+	peers := s.getPeers(peerOK)
+	peerN = len(peers)
+	if peerN == 0 {
 		return
 	}
+	mrand.Shuffle(peerN, func(i, j int) {
+		peers[i], peers[j] = peers[j], peers[i]
+	})
 	pkt, err := msg.Bytes()
 	if err != nil {
 		return
 	}
 
-	success := make(map[Peer]bool, len(peers))
-	okCount := 0
-	sentCount := 0
-	for peer := range peers {
-		if peerOK != nil && !peerOK(peer) {
-			success[peer] = false
-			continue
-		}
-		okCount++
-		if err := send(peer, false, pkt); err != nil {
+	// If true, this node isn't counted any more, either it's dead or we
+	// have already sent an Inv to it.
+	finished := make([]bool, peerN)
+
+	// Try non-blocking sends first and only block if have to.
+	for _, blocking := range []bool{false, true} {
+		for i, peer := range peers {
+			// Send to 2/3 of good peers.
+			if 3*sentN >= 2*(peerN-deadN) {
+				return
+			}
+			if finished[i] {
 				continue
 			}
+			err := send(peer, blocking, pkt)
+			switch err {
+			case nil:
 				if msg.Command == CMDGetAddr {
 					peer.AddGetAddrSent()
 				}
-		success[peer] = true
-		sentCount++
-	}
-
-	// Send to at least 2/3 of good peers.
-	if 3*sentCount >= 2*okCount {
-		return
-	}
-
-	// Perform blocking send now.
-	for peer := range peers {
-		if _, ok := success[peer]; ok || peerOK != nil && !peerOK(peer) {
+				sentN++
+			case errBusy: // Can be retried.
 				continue
+			default:
+				deadN++
 			}
-		if err := send(peer, true, pkt); err != nil {
-			continue
-		}
-		if msg.Command == CMDGetAddr {
-			peer.AddGetAddrSent()
-		}
-		sentCount++
-		if 3*sentCount >= 2*okCount {
-			return
+			finished[i] = true
 		}
 	}
 }
@@ -1247,8 +1262,7 @@ func (s *Server) initStaleMemPools() {
 		threshold = cfg.ValidatorsCount * 2
 	}
 
-	mp := s.chain.GetMemPool()
-	mp.SetResendThreshold(uint32(threshold), s.broadcastTX)
+	s.mempool.SetResendThreshold(uint32(threshold), s.broadcastTX)
 	if s.chain.P2PSigExtensionsEnabled() {
 		s.notaryRequestPool.SetResendThreshold(uint32(threshold), s.broadcastP2PNotaryRequestPayload)
 	}

pkg/network/server_test.go

@@ -694,7 +694,7 @@ func TestInv(t *testing.T) {
 	})
 	t.Run("transaction", func(t *testing.T) {
 		tx := newDummyTx()
-		s.chain.(*fakechain.FakeChain).PutTx(tx)
+		require.NoError(t, s.chain.GetMemPool().Add(tx, s.chain))
 		hs := []util.Uint256{random.Uint256(), tx.Hash(), random.Uint256()}
 		s.testHandleMessage(t, p, CMDInv, &payload.Inventory{
 			Type:   payload.TXType,

pkg/network/tcp_peer.go

@@ -26,6 +26,7 @@ const (
 	requestQueueSize   = 32
 	p2pMsgQueueSize    = 16
 	hpRequestQueueSize = 4
+	incomingQueueSize  = 1 // Each message can be up to 32MB in size.
 )
 
 var (
@@ -57,6 +58,7 @@ type TCPPeer struct {
 	sendQ    chan []byte
 	p2pSendQ chan []byte
 	hpSendQ  chan []byte
+	incoming chan *Message
 
 	// track outstanding getaddr requests.
 	getAddrSent atomic.Int32
@@ -75,6 +77,7 @@ func NewTCPPeer(conn net.Conn, s *Server) *TCPPeer {
 		sendQ:    make(chan []byte, requestQueueSize),
 		p2pSendQ: make(chan []byte, p2pMsgQueueSize),
 		hpSendQ:  make(chan []byte, hpRequestQueueSize),
+		incoming: make(chan *Message, incomingQueueSize),
 	}
 }
 
@@ -158,6 +161,7 @@ func (p *TCPPeer) handleConn() {
 	p.server.register <- p
 
 	go p.handleQueues()
+	go p.handleIncoming()
 	// When a new peer is connected we send out our version immediately.
 	err = p.SendVersion()
 	if err == nil {
@@ -172,14 +176,24 @@ func (p *TCPPeer) handleConn() {
 			} else if err != nil {
 				break
 			}
-			if err = p.server.handleMessage(p, msg); err != nil {
+			p.incoming <- msg
+		}
+	}
+	close(p.incoming)
+	p.Disconnect(err)
+}
+
+func (p *TCPPeer) handleIncoming() {
+	var err error
+	for msg := range p.incoming {
+		err = p.server.handleMessage(p, msg)
+		if err != nil {
 			if p.Handshaked() {
 				err = fmt.Errorf("handling %s message: %w", msg.Command.String(), err)
 			}
 			break
 		}
 	}
-	}
 	p.Disconnect(err)
 }