10 log "github.com/sirupsen/logrus"
11 crypto "github.com/tendermint/go-crypto"
12 cmn "github.com/tendermint/tmlibs/common"
13 dbm "github.com/tendermint/tmlibs/db"
15 cfg "github.com/bytom/config"
16 "github.com/bytom/errors"
17 "github.com/bytom/p2p/trust"
21 bannedPeerKey = "BannedPeer"
22 defaultBanDuration = time.Hour * 1
25 //pre-define errors for connecting fail
27 ErrDuplicatePeer = errors.New("Duplicate peer")
28 ErrConnectSelf = errors.New("Connect self")
29 ErrConnectBannedPeer = errors.New("Connect banned peer")
32 // An AddrBook represents an address book from the pex package, which is used to store peer addresses.
33 type AddrBook interface {
34 AddAddress(*NetAddress, *NetAddress) error
35 AddOurAddress(*NetAddress)
37 RemoveAddress(*NetAddress)
41 //-----------------------------------------------------------------------------
43 // Switch handles peer connections and exposes an API to receive incoming messages
44 // on `Reactors`. Each `Reactor` is responsible for handling incoming messages of one
45 // or more `Channels`. So while sending outgoing messages is typically performed on the peer,
46 // incoming messages are received on the reactor.
51 peerConfig *PeerConfig
53 reactors map[string]Reactor
54 chDescs []*ChannelDescriptor
55 reactorsByCh map[byte]Reactor
58 nodeInfo *NodeInfo // our node info
59 nodePrivKey crypto.PrivKeyEd25519 // our node privkey
61 bannedPeer map[string]time.Time
66 // NewSwitch creates a new Switch with the given config.
67 func NewSwitch(config *cfg.P2PConfig, addrBook AddrBook, trustHistoryDB dbm.DB) *Switch {
70 peerConfig: DefaultPeerConfig(config),
71 reactors: make(map[string]Reactor),
72 chDescs: make([]*ChannelDescriptor, 0),
73 reactorsByCh: make(map[byte]Reactor),
75 dialing: cmn.NewCMap(),
80 sw.BaseService = *cmn.NewBaseService(nil, "P2P Switch", sw)
81 sw.bannedPeer = make(map[string]time.Time)
82 if datajson := sw.db.Get([]byte(bannedPeerKey)); datajson != nil {
83 if err := json.Unmarshal(datajson, &sw.bannedPeer); err != nil {
91 // AddReactor adds the given reactor to the switch.
92 // NOTE: Not goroutine safe.
93 func (sw *Switch) AddReactor(name string, reactor Reactor) Reactor {
94 // Validate the reactor.
95 // No two reactors can share the same channel.
96 reactorChannels := reactor.GetChannels()
97 for _, chDesc := range reactorChannels {
99 if sw.reactorsByCh[chID] != nil {
100 cmn.PanicSanity(fmt.Sprintf("Channel %X has multiple reactors %v & %v", chID, sw.reactorsByCh[chID], reactor))
102 sw.chDescs = append(sw.chDescs, chDesc)
103 sw.reactorsByCh[chID] = reactor
105 sw.reactors[name] = reactor
106 reactor.SetSwitch(sw)
110 // Reactors returns a map of reactors registered on the switch.
111 // NOTE: Not goroutine safe.
112 func (sw *Switch) Reactors() map[string]Reactor {
116 // Reactor returns the reactor with the given name.
117 // NOTE: Not goroutine safe.
118 func (sw *Switch) Reactor(name string) Reactor {
119 return sw.reactors[name]
122 // AddListener adds the given listener to the switch for listening to incoming peer connections.
123 // NOTE: Not goroutine safe.
124 func (sw *Switch) AddListener(l Listener) {
125 sw.listeners = append(sw.listeners, l)
128 // Listeners returns the list of listeners the switch listens on.
129 // NOTE: Not goroutine safe.
130 func (sw *Switch) Listeners() []Listener {
134 // IsListening returns true if the switch has at least one listener.
135 // NOTE: Not goroutine safe.
136 func (sw *Switch) IsListening() bool {
137 return len(sw.listeners) > 0
140 // SetNodeInfo sets the switch's NodeInfo for checking compatibility and handshaking with other nodes.
141 // NOTE: Not goroutine safe.
142 func (sw *Switch) SetNodeInfo(nodeInfo *NodeInfo) {
143 sw.nodeInfo = nodeInfo
146 // NodeInfo returns the switch's NodeInfo.
147 // NOTE: Not goroutine safe.
148 func (sw *Switch) NodeInfo() *NodeInfo {
152 // SetNodePrivKey sets the switch's private key for authenticated encryption.
153 // NOTE: Not goroutine safe.
154 func (sw *Switch) SetNodePrivKey(nodePrivKey crypto.PrivKeyEd25519) {
155 sw.nodePrivKey = nodePrivKey
156 if sw.nodeInfo != nil {
157 sw.nodeInfo.PubKey = nodePrivKey.PubKey().Unwrap().(crypto.PubKeyEd25519)
161 // OnStart implements BaseService. It starts all the reactors, peers, and listeners.
162 func (sw *Switch) OnStart() error {
164 for _, reactor := range sw.reactors {
165 _, err := reactor.Start()
171 for _, listener := range sw.listeners {
172 go sw.listenerRoutine(listener)
177 // OnStop implements BaseService. It stops all listeners, peers, and reactors.
178 func (sw *Switch) OnStop() {
180 for _, listener := range sw.listeners {
185 for _, peer := range sw.peers.List() {
187 sw.peers.Remove(peer)
190 for _, reactor := range sw.reactors {
195 // AddPeer performs the P2P handshake with a peer
196 // that already has a SecretConnection. If all goes well,
197 // it starts the peer and adds it to the switch.
198 // NOTE: This performs a blocking handshake before the peer is added.
199 // CONTRACT: If error is returned, peer is nil, and conn is immediately closed.
200 func (sw *Switch) AddPeer(pc *peerConn) error {
201 peerNodeInfo, err := pc.HandshakeTimeout(sw.nodeInfo, time.Duration(sw.peerConfig.HandshakeTimeout*time.Second))
203 return ErrConnectBannedPeer
205 // Check version, chain id
206 if err := sw.nodeInfo.CompatibleWith(peerNodeInfo); err != nil {
210 peer := newPeer(pc, peerNodeInfo, sw.reactorsByCh, sw.chDescs, sw.StopPeerForError)
213 if err := sw.filterConnByPeer(peer); err != nil {
219 if err := sw.startInitPeer(peer); err != nil {
224 // Add the peer to .peers.
225 // We start it first so that a peer in the list is safe to Stop.
226 // It should not err since we already checked peers.Has()
227 if err := sw.peers.Add(peer); err != nil {
231 log.Info("Added peer:", peer)
235 func (sw *Switch) startInitPeer(peer *Peer) error {
236 peer.Start() // spawn send/recv routines
237 for _, reactor := range sw.reactors {
238 if err := reactor.AddPeer(peer); err != nil {
245 func (sw *Switch) dialSeed(addr *NetAddress) {
246 err := sw.DialPeerWithAddress(addr)
248 log.Info("Error dialing seed:", addr.String())
252 func (sw *Switch) addrBookDelSelf() error {
253 addr, err := NewNetAddressString(sw.nodeInfo.ListenAddr)
257 // remove the given address from the address book if we're added it earlier
258 sw.addrBook.RemoveAddress(addr)
259 // add the given address to the address book to avoid dialing ourselves
260 // again this is our public address
261 sw.addrBook.AddOurAddress(addr)
265 func (sw *Switch) filterConnByIP(ip string) error {
266 if err := sw.checkBannedPeer(ip); err != nil {
267 return ErrConnectBannedPeer
270 if ip == sw.nodeInfo.ListenHost() {
272 return ErrConnectSelf
278 func (sw *Switch) filterConnByPeer(peer *Peer) error {
279 if err := sw.checkBannedPeer(peer.NodeInfo.RemoteAddrHost()); err != nil {
280 return ErrConnectBannedPeer
283 if sw.nodeInfo.PubKey.Equals(peer.PubKey().Wrap()) {
285 return ErrConnectSelf
288 // Check for duplicate peer
289 if sw.peers.Has(peer.Key) {
290 return ErrDuplicatePeer
295 //DialPeerWithAddress dial node from net address
296 func (sw *Switch) DialPeerWithAddress(addr *NetAddress) error {
297 log.Debug("Dialing peer address:", addr)
299 if err := sw.filterConnByIP(addr.IP.String()); err != nil {
303 sw.dialing.Set(addr.IP.String(), addr)
304 defer sw.dialing.Delete(addr.IP.String())
306 pc, err := newOutboundPeerConn(addr, sw.reactorsByCh, sw.chDescs, sw.StopPeerForError, sw.nodePrivKey, sw.peerConfig)
308 log.Debug("Failed to dial peer", " address:", addr, " error:", err)
314 log.Info("Failed to add peer:", addr, " err:", err)
318 log.Info("Dialed and added peer:", addr)
322 //IsDialing prevent duplicate dialing
323 func (sw *Switch) IsDialing(addr *NetAddress) bool {
324 return sw.dialing.Has(addr.IP.String())
327 // NumPeers Returns the count of outbound/inbound and outbound-dialing peers.
328 func (sw *Switch) NumPeers() (outbound, inbound, dialing int) {
329 peers := sw.peers.List()
330 for _, peer := range peers {
337 dialing = sw.dialing.Size()
341 //Peers return switch peerset
342 func (sw *Switch) Peers() *PeerSet {
346 // StopPeerForError disconnects from a peer due to external error.
347 func (sw *Switch) StopPeerForError(peer *Peer, reason interface{}) {
348 log.Info("Stopping peer for error.", " peer:", peer, " err:", reason)
349 sw.stopAndRemovePeer(peer, reason)
352 // StopPeerGracefully disconnect from a peer gracefully.
353 func (sw *Switch) StopPeerGracefully(peer *Peer) {
354 log.Info("Stopping peer gracefully")
355 sw.stopAndRemovePeer(peer, nil)
358 func (sw *Switch) stopAndRemovePeer(peer *Peer, reason interface{}) {
359 for _, reactor := range sw.reactors {
360 reactor.RemovePeer(peer, reason)
362 sw.peers.Remove(peer)
366 func (sw *Switch) listenerRoutine(l Listener) {
368 inConn, ok := <-l.Connections()
373 // disconnect if we alrady have 2 * MaxNumPeers, we do this because we wanna address book get exchanged even if
374 // the connect is full. The pex will disconnect the peer after address exchange, the max connected peer won't
375 // be double of MaxNumPeers
376 if sw.peers.Size() >= sw.Config.MaxNumPeers*2 {
378 log.Info("Ignoring inbound connection: already have enough peers.")
382 // New inbound connection!
383 err := sw.addPeerWithConnection(inConn)
385 log.Info("Ignoring inbound connection: error while adding peer.", " address:", inConn.RemoteAddr().String(), " error:", err)
391 func (sw *Switch) addPeerWithConnection(conn net.Conn) error {
392 peerConn, err := newInboundPeerConn(conn, sw.reactorsByCh, sw.chDescs, sw.StopPeerForError, sw.nodePrivKey, sw.Config)
397 if err = sw.AddPeer(peerConn); err != nil {
405 //AddBannedPeer add peer to blacklist
406 func (sw *Switch) AddBannedPeer(peer *Peer) error {
408 defer sw.mtx.Unlock()
409 key := peer.NodeInfo.RemoteAddrHost()
410 sw.bannedPeer[key] = time.Now().Add(defaultBanDuration)
411 datajson, err := json.Marshal(sw.bannedPeer)
415 sw.db.Set([]byte(bannedPeerKey), datajson)
419 func (sw *Switch) delBannedPeer(addr string) error {
420 delete(sw.bannedPeer, addr)
421 datajson, err := json.Marshal(sw.bannedPeer)
425 sw.db.Set([]byte(bannedPeerKey), datajson)
429 func (sw *Switch) checkBannedPeer(peer string) error {
431 defer sw.mtx.Unlock()
433 if banEnd, ok := sw.bannedPeer[peer]; ok {
434 if time.Now().Before(banEnd) {
435 return ErrConnectBannedPeer
437 sw.delBannedPeer(peer)