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
32 //pre-define errors for connecting fail
34 ErrDuplicatePeer = errors.New("Duplicate peer")
35 ErrConnectSelf = errors.New("Connect self")
36 ErrConnectBannedPeer = errors.New("Connect banned peer")
37 ErrConnectSpvPeer = errors.New("Outbound connect spv peer")
40 type discv interface {
41 ReadRandomNodes(buf []*discover.Node) (n int)
44 // Switch handles peer connections and exposes an API to receive incoming messages
45 // on `Reactors`. Each `Reactor` is responsible for handling incoming messages of one
46 // or more `Channels`. So while sending outgoing messages is typically performed on the peer,
47 // incoming messages are received on the reactor.
52 peerConfig *PeerConfig
54 reactors map[string]Reactor
55 chDescs []*connection.ChannelDescriptor
56 reactorsByCh map[byte]Reactor
59 nodeInfo *NodeInfo // our node info
60 nodePrivKey crypto.PrivKeyEd25519 // our node privkey
62 bannedPeer map[string]time.Time
67 // NewSwitch create a new Switch and set discover.
68 func NewSwitch(config *cfg.Config) (*Switch, error) {
72 var discv *discover.Network
74 blacklistDB := dbm.NewDB("trusthistory", config.DBBackend, config.DBDir())
75 config.P2P.PrivateKey, err = config.NodeKey()
80 bytes, err := hex.DecodeString(config.P2P.PrivateKey)
86 copy(newKey[:], bytes)
87 privKey := crypto.PrivKeyEd25519(newKey)
88 if !config.VaultMode {
90 l, listenAddr = GetListener(config.P2P)
91 discv, err = discover.NewDiscover(config, ed25519.PrivateKey(bytes), l.ExternalAddress().Port)
97 return newSwitch(config, discv, blacklistDB, l, privKey, listenAddr)
100 // newSwitch creates a new Switch with the given config.
101 func newSwitch(config *cfg.Config, discv discv, blacklistDB dbm.DB, l Listener, priv crypto.PrivKeyEd25519, listenAddr string) (*Switch, error) {
104 peerConfig: DefaultPeerConfig(config.P2P),
105 reactors: make(map[string]Reactor),
106 chDescs: make([]*connection.ChannelDescriptor, 0),
107 reactorsByCh: make(map[byte]Reactor),
109 dialing: cmn.NewCMap(),
113 nodeInfo: NewNodeInfo(config, priv.PubKey().Unwrap().(crypto.PubKeyEd25519), listenAddr),
114 bannedPeer: make(map[string]time.Time),
116 if err := sw.loadBannedPeers(); err != nil {
121 sw.BaseService = *cmn.NewBaseService(nil, "P2P Switch", sw)
126 // OnStart implements BaseService. It starts all the reactors, peers, and listeners.
127 func (sw *Switch) OnStart() error {
128 for _, reactor := range sw.reactors {
129 if _, err := reactor.Start(); err != nil {
133 for _, listener := range sw.listeners {
134 go sw.listenerRoutine(listener)
136 go sw.ensureOutboundPeersRoutine()
140 // OnStop implements BaseService. It stops all listeners, peers, and reactors.
141 func (sw *Switch) OnStop() {
142 for _, listener := range sw.listeners {
147 for _, peer := range sw.peers.List() {
149 sw.peers.Remove(peer)
152 for _, reactor := range sw.reactors {
157 //AddBannedPeer add peer to blacklist
158 func (sw *Switch) AddBannedPeer(ip string) error {
160 defer sw.mtx.Unlock()
162 sw.bannedPeer[ip] = time.Now().Add(defaultBanDuration)
163 dataJSON, err := json.Marshal(sw.bannedPeer)
168 sw.db.Set([]byte(bannedPeerKey), dataJSON)
172 // AddPeer performs the P2P handshake with a peer
173 // that already has a SecretConnection. If all goes well,
174 // it starts the peer and adds it to the switch.
175 // NOTE: This performs a blocking handshake before the peer is added.
176 // CONTRACT: If error is returned, peer is nil, and conn is immediately closed.
177 func (sw *Switch) AddPeer(pc *peerConn) error {
178 peerNodeInfo, err := pc.HandshakeTimeout(sw.nodeInfo, sw.peerConfig.HandshakeTimeout)
183 if err := version.Status.CheckUpdate(sw.nodeInfo.Version, peerNodeInfo.Version, peerNodeInfo.RemoteAddr); err != nil {
186 if err := sw.nodeInfo.CompatibleWith(peerNodeInfo); err != nil {
190 peer := newPeer(pc, peerNodeInfo, sw.reactorsByCh, sw.chDescs, sw.StopPeerForError)
191 if err := sw.filterConnByPeer(peer); err != nil {
195 if pc.outbound && !peer.ServiceFlag().IsEnable(consensus.SFFullNode) {
196 return ErrConnectSpvPeer
201 if err := sw.startInitPeer(peer); err != nil {
206 return sw.peers.Add(peer)
209 // AddReactor adds the given reactor to the switch.
210 // NOTE: Not goroutine safe.
211 func (sw *Switch) AddReactor(name string, reactor Reactor) Reactor {
212 // Validate the reactor.
213 // No two reactors can share the same channel.
214 for _, chDesc := range reactor.GetChannels() {
216 if sw.reactorsByCh[chID] != nil {
217 cmn.PanicSanity(fmt.Sprintf("Channel %X has multiple reactors %v & %v", chID, sw.reactorsByCh[chID], reactor))
219 sw.chDescs = append(sw.chDescs, chDesc)
220 sw.reactorsByCh[chID] = reactor
222 sw.reactors[name] = reactor
223 reactor.SetSwitch(sw)
227 // AddListener adds the given listener to the switch for listening to incoming peer connections.
228 // NOTE: Not goroutine safe.
229 func (sw *Switch) AddListener(l Listener) {
230 sw.listeners = append(sw.listeners, l)
233 //DialPeerWithAddress dial node from net address
234 func (sw *Switch) DialPeerWithAddress(addr *NetAddress) error {
235 log.Debug("Dialing peer address:", addr)
236 sw.dialing.Set(addr.IP.String(), addr)
237 defer sw.dialing.Delete(addr.IP.String())
238 if err := sw.filterConnByIP(addr.IP.String()); err != nil {
242 pc, err := newOutboundPeerConn(addr, sw.nodePrivKey, sw.peerConfig)
244 log.WithFields(log.Fields{"address": addr, " err": err}).Error("DialPeer fail on newOutboundPeerConn")
248 if err = sw.AddPeer(pc); err != nil {
249 log.WithFields(log.Fields{"address": addr, " err": err}).Error("DialPeer fail on switch AddPeer")
253 log.Debug("DialPeer added peer:", addr)
257 //IsDialing prevent duplicate dialing
258 func (sw *Switch) IsDialing(addr *NetAddress) bool {
259 return sw.dialing.Has(addr.IP.String())
262 // IsListening returns true if the switch has at least one listener.
263 // NOTE: Not goroutine safe.
264 func (sw *Switch) IsListening() bool {
265 return len(sw.listeners) > 0
268 // loadBannedPeers load banned peers from db
269 func (sw *Switch) loadBannedPeers() error {
270 if dataJSON := sw.db.Get([]byte(bannedPeerKey)); dataJSON != nil {
271 if err := json.Unmarshal(dataJSON, &sw.bannedPeer); err != nil {
279 // Listeners returns the list of listeners the switch listens on.
280 // NOTE: Not goroutine safe.
281 func (sw *Switch) Listeners() []Listener {
285 // NumPeers Returns the count of outbound/inbound and outbound-dialing peers.
286 func (sw *Switch) NumPeers() (outbound, inbound, dialing int) {
287 peers := sw.peers.List()
288 for _, peer := range peers {
295 dialing = sw.dialing.Size()
299 // NodeInfo returns the switch's NodeInfo.
300 // NOTE: Not goroutine safe.
301 func (sw *Switch) NodeInfo() *NodeInfo {
305 //Peers return switch peerset
306 func (sw *Switch) Peers() *PeerSet {
310 // StopPeerForError disconnects from a peer due to external error.
311 func (sw *Switch) StopPeerForError(peer *Peer, reason interface{}) {
312 log.WithFields(log.Fields{"peer": peer, " err": reason}).Debug("stopping peer for error")
313 sw.stopAndRemovePeer(peer, reason)
316 // StopPeerGracefully disconnect from a peer gracefully.
317 func (sw *Switch) StopPeerGracefully(peerID string) {
318 if peer := sw.peers.Get(peerID); peer != nil {
319 sw.stopAndRemovePeer(peer, nil)
323 func (sw *Switch) addPeerWithConnection(conn net.Conn) error {
324 peerConn, err := newInboundPeerConn(conn, sw.nodePrivKey, sw.Config.P2P)
326 if err := conn.Close(); err != nil {
327 log.WithFields(log.Fields{"remote peer:": conn.RemoteAddr().String(), " err:": err}).Error("closes connection err")
332 if err = sw.AddPeer(peerConn); err != nil {
333 if err := conn.Close(); err != nil {
334 log.WithFields(log.Fields{"remote peer:": conn.RemoteAddr().String(), " err:": err}).Error("closes connection err")
342 func (sw *Switch) checkBannedPeer(peer string) error {
344 defer sw.mtx.Unlock()
346 if banEnd, ok := sw.bannedPeer[peer]; ok {
347 if time.Now().Before(banEnd) {
348 return ErrConnectBannedPeer
351 if err := sw.delBannedPeer(peer); err != nil {
358 func (sw *Switch) delBannedPeer(addr string) error {
360 defer sw.mtx.Unlock()
362 delete(sw.bannedPeer, addr)
363 datajson, err := json.Marshal(sw.bannedPeer)
368 sw.db.Set([]byte(bannedPeerKey), datajson)
372 func (sw *Switch) filterConnByIP(ip string) error {
373 if ip == sw.nodeInfo.listenHost() {
374 return ErrConnectSelf
376 return sw.checkBannedPeer(ip)
379 func (sw *Switch) filterConnByPeer(peer *Peer) error {
380 if err := sw.checkBannedPeer(peer.remoteAddrHost()); err != nil {
384 if sw.nodeInfo.getPubkey().Equals(peer.PubKey().Wrap()) {
385 return ErrConnectSelf
388 if sw.peers.Has(peer.Key) {
389 return ErrDuplicatePeer
394 func (sw *Switch) listenerRoutine(l Listener) {
396 inConn, ok := <-l.Connections()
401 // disconnect if we alrady have MaxNumPeers
402 if sw.peers.Size() >= sw.Config.P2P.MaxNumPeers {
403 if err := inConn.Close(); err != nil {
404 log.WithFields(log.Fields{"remote peer:": inConn.RemoteAddr().String(), " err:": err}).Error("closes connection err")
406 log.Info("Ignoring inbound connection: already have enough peers.")
410 // New inbound connection!
411 if err := sw.addPeerWithConnection(inConn); err != nil {
412 log.Info("Ignoring inbound connection: error while adding peer.", " address:", inConn.RemoteAddr().String(), " error:", err)
418 func (sw *Switch) dialPeerWorker(a *NetAddress, wg *sync.WaitGroup) {
419 if err := sw.DialPeerWithAddress(a); err != nil {
420 log.WithFields(log.Fields{"addr": a, "err": err}).Error("dialPeerWorker fail on dial peer")
425 func (sw *Switch) ensureOutboundPeers() {
426 numOutPeers, _, numDialing := sw.NumPeers()
427 numToDial := (minNumOutboundPeers - (numOutPeers + numDialing))
428 log.WithFields(log.Fields{"numOutPeers": numOutPeers, "numDialing": numDialing, "numToDial": numToDial}).Debug("ensure peers")
433 connectedPeers := make(map[string]struct{})
434 for _, peer := range sw.Peers().List() {
435 connectedPeers[peer.remoteAddrHost()] = struct{}{}
438 var wg sync.WaitGroup
439 nodes := make([]*discover.Node, numToDial)
440 n := sw.discv.ReadRandomNodes(nodes)
441 for i := 0; i < n; i++ {
442 try := NewNetAddressIPPort(nodes[i].IP, nodes[i].TCP)
443 if sw.NodeInfo().ListenAddr == try.String() {
446 if dialling := sw.IsDialing(try); dialling {
449 if _, ok := connectedPeers[try.IP.String()]; ok {
454 go sw.dialPeerWorker(try, &wg)
459 func (sw *Switch) ensureOutboundPeersRoutine() {
460 sw.ensureOutboundPeers()
462 ticker := time.NewTicker(10 * time.Second)
468 sw.ensureOutboundPeers()
475 func (sw *Switch) startInitPeer(peer *Peer) error {
476 // spawn send/recv routines
477 if _, err := peer.Start(); err != nil {
478 log.WithFields(log.Fields{"remote peer:": peer.RemoteAddr, " err:": err}).Error("init peer err")
481 for _, reactor := range sw.reactors {
482 if err := reactor.AddPeer(peer); err != nil {
489 func (sw *Switch) stopAndRemovePeer(peer *Peer, reason interface{}) {
490 sw.peers.Remove(peer)
491 for _, reactor := range sw.reactors {
492 reactor.RemovePeer(peer, reason)
496 sentStatus, receivedStatus := peer.TrafficStatus()
497 log.WithFields(log.Fields{
498 "address": peer.Addr().String(),
500 "duration": sentStatus.Duration.String(),
501 "total_sent": sentStatus.Bytes,
502 "total_received": receivedStatus.Bytes,
503 "average_sent_rate": sentStatus.AvgRate,
504 "average_received_rate": receivedStatus.AvgRate,
505 }).Info("disconnect with peer")