11 log "github.com/sirupsen/logrus"
12 "github.com/tendermint/go-crypto"
13 cmn "github.com/tendermint/tmlibs/common"
14 dbm "github.com/tendermint/tmlibs/db"
16 cfg "github.com/bytom/config"
17 "github.com/bytom/consensus"
18 "github.com/bytom/crypto/ed25519"
19 "github.com/bytom/errors"
20 "github.com/bytom/p2p/connection"
21 "github.com/bytom/p2p/discover"
22 "github.com/bytom/p2p/trust"
23 "github.com/bytom/version"
27 bannedPeerKey = "BannedPeer"
28 defaultBanDuration = time.Hour * 1
29 minNumOutboundPeers = 3
33 //pre-define errors for connecting fail
35 ErrDuplicatePeer = errors.New("Duplicate peer")
36 ErrConnectSelf = errors.New("Connect self")
37 ErrConnectBannedPeer = errors.New("Connect banned peer")
38 ErrConnectSpvPeer = errors.New("Outbound connect spv peer")
41 type discv interface {
42 ReadRandomNodes(buf []*discover.Node) (n int)
45 // Switch handles peer connections and exposes an API to receive incoming messages
46 // on `Reactors`. Each `Reactor` is responsible for handling incoming messages of one
47 // or more `Channels`. So while sending outgoing messages is typically performed on the peer,
48 // incoming messages are received on the reactor.
53 peerConfig *PeerConfig
55 reactors map[string]Reactor
56 chDescs []*connection.ChannelDescriptor
57 reactorsByCh map[byte]Reactor
60 nodeInfo *NodeInfo // our node info
61 nodePrivKey crypto.PrivKeyEd25519 // our node privkey
63 bannedPeer map[string]time.Time
68 // NewSwitch create a new Switch and set discover.
69 func NewSwitch(config *cfg.Config) (*Switch, error) {
73 var discv *discover.Network
75 blacklistDB := dbm.NewDB("trusthistory", config.DBBackend, config.DBDir())
76 config.P2P.PrivateKey, err = config.NodeKey()
81 bytes, err := hex.DecodeString(config.P2P.PrivateKey)
87 copy(newKey[:], bytes)
88 privKey := crypto.PrivKeyEd25519(newKey)
89 if !config.VaultMode {
91 l, listenAddr = GetListener(config.P2P)
92 discv, err = discover.NewDiscover(config, ed25519.PrivateKey(bytes), l.ExternalAddress().Port)
98 return newSwitch(config, discv, blacklistDB, l, privKey, listenAddr)
101 // newSwitch creates a new Switch with the given config.
102 func newSwitch(config *cfg.Config, discv discv, blacklistDB dbm.DB, l Listener, priv crypto.PrivKeyEd25519, listenAddr string) (*Switch, error) {
105 peerConfig: DefaultPeerConfig(config.P2P),
106 reactors: make(map[string]Reactor),
107 chDescs: make([]*connection.ChannelDescriptor, 0),
108 reactorsByCh: make(map[byte]Reactor),
110 dialing: cmn.NewCMap(),
114 nodeInfo: NewNodeInfo(config, priv.PubKey().Unwrap().(crypto.PubKeyEd25519), listenAddr),
115 bannedPeer: make(map[string]time.Time),
117 if err := sw.loadBannedPeers(); err != nil {
122 sw.BaseService = *cmn.NewBaseService(nil, "P2P Switch", sw)
127 // OnStart implements BaseService. It starts all the reactors, peers, and listeners.
128 func (sw *Switch) OnStart() error {
129 for _, reactor := range sw.reactors {
130 if _, err := reactor.Start(); err != nil {
134 for _, listener := range sw.listeners {
135 go sw.listenerRoutine(listener)
137 go sw.ensureOutboundPeersRoutine()
141 // OnStop implements BaseService. It stops all listeners, peers, and reactors.
142 func (sw *Switch) OnStop() {
143 for _, listener := range sw.listeners {
148 for _, peer := range sw.peers.List() {
150 sw.peers.Remove(peer)
153 for _, reactor := range sw.reactors {
158 //AddBannedPeer add peer to blacklist
159 func (sw *Switch) AddBannedPeer(ip string) error {
161 defer sw.mtx.Unlock()
163 sw.bannedPeer[ip] = time.Now().Add(defaultBanDuration)
164 dataJSON, err := json.Marshal(sw.bannedPeer)
169 sw.db.Set([]byte(bannedPeerKey), dataJSON)
173 // AddPeer performs the P2P handshake with a peer
174 // that already has a SecretConnection. If all goes well,
175 // it starts the peer and adds it to the switch.
176 // NOTE: This performs a blocking handshake before the peer is added.
177 // CONTRACT: If error is returned, peer is nil, and conn is immediately closed.
178 func (sw *Switch) AddPeer(pc *peerConn) error {
179 peerNodeInfo, err := pc.HandshakeTimeout(sw.nodeInfo, sw.peerConfig.HandshakeTimeout)
184 if err := version.Status.CheckUpdate(sw.nodeInfo.Version, peerNodeInfo.Version, peerNodeInfo.RemoteAddr); err != nil {
187 if err := sw.nodeInfo.CompatibleWith(peerNodeInfo); err != nil {
191 peer := newPeer(pc, peerNodeInfo, sw.reactorsByCh, sw.chDescs, sw.StopPeerForError)
192 if err := sw.filterConnByPeer(peer); err != nil {
196 if pc.outbound && !peer.ServiceFlag().IsEnable(consensus.SFFullNode) {
197 return ErrConnectSpvPeer
202 if err := sw.startInitPeer(peer); err != nil {
207 return sw.peers.Add(peer)
210 // AddReactor adds the given reactor to the switch.
211 // NOTE: Not goroutine safe.
212 func (sw *Switch) AddReactor(name string, reactor Reactor) Reactor {
213 // Validate the reactor.
214 // No two reactors can share the same channel.
215 for _, chDesc := range reactor.GetChannels() {
217 if sw.reactorsByCh[chID] != nil {
218 cmn.PanicSanity(fmt.Sprintf("Channel %X has multiple reactors %v & %v", chID, sw.reactorsByCh[chID], reactor))
220 sw.chDescs = append(sw.chDescs, chDesc)
221 sw.reactorsByCh[chID] = reactor
223 sw.reactors[name] = reactor
224 reactor.SetSwitch(sw)
228 // AddListener adds the given listener to the switch for listening to incoming peer connections.
229 // NOTE: Not goroutine safe.
230 func (sw *Switch) AddListener(l Listener) {
231 sw.listeners = append(sw.listeners, l)
234 //DialPeerWithAddress dial node from net address
235 func (sw *Switch) DialPeerWithAddress(addr *NetAddress) error {
236 log.WithFields(log.Fields{"module": logModule, "address": addr}).Debug("Dialing peer")
237 sw.dialing.Set(addr.IP.String(), addr)
238 defer sw.dialing.Delete(addr.IP.String())
239 if err := sw.filterConnByIP(addr.IP.String()); err != nil {
243 pc, err := newOutboundPeerConn(addr, sw.nodePrivKey, sw.peerConfig)
245 log.WithFields(log.Fields{"module": logModule, "address": addr, " err": err}).Error("DialPeer fail on newOutboundPeerConn")
249 if err = sw.AddPeer(pc); err != nil {
250 log.WithFields(log.Fields{"module": logModule, "address": addr, " err": err}).Error("DialPeer fail on switch AddPeer")
254 log.WithFields(log.Fields{"module": logModule, "address": addr, "peer num": sw.peers.Size()}).Debug("DialPeer added peer")
258 //IsDialing prevent duplicate dialing
259 func (sw *Switch) IsDialing(addr *NetAddress) bool {
260 return sw.dialing.Has(addr.IP.String())
263 // IsListening returns true if the switch has at least one listener.
264 // NOTE: Not goroutine safe.
265 func (sw *Switch) IsListening() bool {
266 return len(sw.listeners) > 0
269 // loadBannedPeers load banned peers from db
270 func (sw *Switch) loadBannedPeers() error {
271 if dataJSON := sw.db.Get([]byte(bannedPeerKey)); dataJSON != nil {
272 if err := json.Unmarshal(dataJSON, &sw.bannedPeer); err != nil {
280 // Listeners returns the list of listeners the switch listens on.
281 // NOTE: Not goroutine safe.
282 func (sw *Switch) Listeners() []Listener {
286 // NumPeers Returns the count of outbound/inbound and outbound-dialing peers.
287 func (sw *Switch) NumPeers() (outbound, inbound, dialing int) {
288 peers := sw.peers.List()
289 for _, peer := range peers {
296 dialing = sw.dialing.Size()
300 // NodeInfo returns the switch's NodeInfo.
301 // NOTE: Not goroutine safe.
302 func (sw *Switch) NodeInfo() *NodeInfo {
306 //Peers return switch peerset
307 func (sw *Switch) Peers() *PeerSet {
311 // StopPeerForError disconnects from a peer due to external error.
312 func (sw *Switch) StopPeerForError(peer *Peer, reason interface{}) {
313 log.WithFields(log.Fields{"module": logModule, "peer": peer, " err": reason}).Debug("stopping peer for error")
314 sw.stopAndRemovePeer(peer, reason)
317 // StopPeerGracefully disconnect from a peer gracefully.
318 func (sw *Switch) StopPeerGracefully(peerID string) {
319 if peer := sw.peers.Get(peerID); peer != nil {
320 sw.stopAndRemovePeer(peer, nil)
324 func (sw *Switch) addPeerWithConnection(conn net.Conn) error {
325 peerConn, err := newInboundPeerConn(conn, sw.nodePrivKey, sw.Config.P2P)
327 if err := conn.Close(); err != nil {
328 log.WithFields(log.Fields{"module": logModule, "remote peer:": conn.RemoteAddr().String(), " err:": err}).Error("closes connection err")
333 if err = sw.AddPeer(peerConn); err != nil {
334 if err := conn.Close(); err != nil {
335 log.WithFields(log.Fields{"module": logModule, "remote peer:": conn.RemoteAddr().String(), " err:": err}).Error("closes connection err")
340 log.WithFields(log.Fields{"module": logModule, "address": conn.RemoteAddr().String(), "peer num": sw.peers.Size()}).Debug("add inbound peer")
344 func (sw *Switch) checkBannedPeer(peer string) error {
346 defer sw.mtx.Unlock()
348 if banEnd, ok := sw.bannedPeer[peer]; ok {
349 if time.Now().Before(banEnd) {
350 return ErrConnectBannedPeer
353 if err := sw.delBannedPeer(peer); err != nil {
360 func (sw *Switch) delBannedPeer(addr string) error {
362 defer sw.mtx.Unlock()
364 delete(sw.bannedPeer, addr)
365 datajson, err := json.Marshal(sw.bannedPeer)
370 sw.db.Set([]byte(bannedPeerKey), datajson)
374 func (sw *Switch) filterConnByIP(ip string) error {
375 if ip == sw.nodeInfo.listenHost() {
376 return ErrConnectSelf
378 return sw.checkBannedPeer(ip)
381 func (sw *Switch) filterConnByPeer(peer *Peer) error {
382 if err := sw.checkBannedPeer(peer.remoteAddrHost()); err != nil {
386 if sw.nodeInfo.getPubkey().Equals(peer.PubKey().Wrap()) {
387 return ErrConnectSelf
390 if sw.peers.Has(peer.Key) {
391 return ErrDuplicatePeer
396 func (sw *Switch) listenerRoutine(l Listener) {
398 inConn, ok := <-l.Connections()
403 // disconnect if we alrady have MaxNumPeers
404 if sw.peers.Size() >= sw.Config.P2P.MaxNumPeers {
405 if err := inConn.Close(); err != nil {
406 log.WithFields(log.Fields{"module": logModule, "remote peer:": inConn.RemoteAddr().String(), " err:": err}).Error("closes connection err")
408 log.Info("Ignoring inbound connection: already have enough peers.")
412 // New inbound connection!
413 if err := sw.addPeerWithConnection(inConn); err != nil {
414 log.Info("Ignoring inbound connection: error while adding peer.", " address:", inConn.RemoteAddr().String(), " error:", err)
420 func (sw *Switch) dialPeerWorker(a *NetAddress, wg *sync.WaitGroup) {
421 if err := sw.DialPeerWithAddress(a); err != nil {
422 log.WithFields(log.Fields{"module": logModule, "addr": a, "err": err}).Error("dialPeerWorker fail on dial peer")
427 func (sw *Switch) ensureOutboundPeers() {
428 numOutPeers, _, numDialing := sw.NumPeers()
429 numToDial := (minNumOutboundPeers - (numOutPeers + numDialing))
430 log.WithFields(log.Fields{"module": logModule, "numOutPeers": numOutPeers, "numDialing": numDialing, "numToDial": numToDial}).Debug("ensure peers")
435 connectedPeers := make(map[string]struct{})
436 for _, peer := range sw.Peers().List() {
437 connectedPeers[peer.remoteAddrHost()] = struct{}{}
440 var wg sync.WaitGroup
441 nodes := make([]*discover.Node, numToDial)
442 n := sw.discv.ReadRandomNodes(nodes)
443 for i := 0; i < n; i++ {
444 try := NewNetAddressIPPort(nodes[i].IP, nodes[i].TCP)
445 if sw.NodeInfo().ListenAddr == try.String() {
448 if dialling := sw.IsDialing(try); dialling {
451 if _, ok := connectedPeers[try.IP.String()]; ok {
456 go sw.dialPeerWorker(try, &wg)
461 func (sw *Switch) ensureOutboundPeersRoutine() {
462 sw.ensureOutboundPeers()
464 ticker := time.NewTicker(10 * time.Second)
470 sw.ensureOutboundPeers()
477 func (sw *Switch) startInitPeer(peer *Peer) error {
478 // spawn send/recv routines
479 if _, err := peer.Start(); err != nil {
480 log.WithFields(log.Fields{"module": logModule, "remote peer:": peer.RemoteAddr, " err:": err}).Error("init peer err")
483 for _, reactor := range sw.reactors {
484 if err := reactor.AddPeer(peer); err != nil {
491 func (sw *Switch) stopAndRemovePeer(peer *Peer, reason interface{}) {
492 sw.peers.Remove(peer)
493 for _, reactor := range sw.reactors {
494 reactor.RemovePeer(peer, reason)
498 sentStatus, receivedStatus := peer.TrafficStatus()
499 log.WithFields(log.Fields{
501 "address": peer.Addr().String(),
503 "duration": sentStatus.Duration.String(),
504 "total_sent": sentStatus.Bytes,
505 "total_received": receivedStatus.Bytes,
506 "average_sent_rate": sentStatus.AvgRate,
507 "average_received_rate": receivedStatus.AvgRate,
508 "peer num": sw.peers.Size(),
509 }).Info("disconnect with peer")