11 log "github.com/sirupsen/logrus"
12 crypto "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/errors"
18 "github.com/bytom/p2p/trust"
22 bannedPeerKey = "BannedPeer"
23 defaultBanDuration = time.Hour * 1
27 ErrDuplicatePeer = errors.New("Duplicate peer")
28 ErrConnectSelf = errors.New("Connect self")
29 ErrConnectBannedPeer = errors.New("Connect banned peer")
32 //-----------------------------------------------------------------------------
34 // Switch handles peer connections and exposes an API to receive incoming messages
35 // on `Reactors`. Each `Reactor` is responsible for handling incoming messages of one
36 // or more `Channels`. So while sending outgoing messages is typically performed on the peer,
37 // incoming messages are received on the reactor.
42 peerConfig *PeerConfig
44 reactors map[string]Reactor
45 chDescs []*ChannelDescriptor
46 reactorsByCh map[byte]Reactor
49 nodeInfo *NodeInfo // our node info
50 nodePrivKey crypto.PrivKeyEd25519 // our node privkey
52 bannedPeer map[string]time.Time
57 // NewSwitch creates a new Switch with the given config.
58 func NewSwitch(config *cfg.P2PConfig, trustHistoryDB dbm.DB) *Switch {
61 peerConfig: DefaultPeerConfig(config),
62 reactors: make(map[string]Reactor),
63 chDescs: make([]*ChannelDescriptor, 0),
64 reactorsByCh: make(map[byte]Reactor),
66 dialing: cmn.NewCMap(),
70 sw.BaseService = *cmn.NewBaseService(nil, "P2P Switch", sw)
72 // Optionally, start the pex reactor
73 if config.PexReactor {
74 sw.addrBook = NewAddrBook(config.AddrBookFile(), config.AddrBookStrict)
75 pexReactor := NewPEXReactor(sw.addrBook, sw)
76 sw.AddReactor("PEX", pexReactor)
79 sw.bannedPeer = make(map[string]time.Time)
80 if datajson := sw.db.Get([]byte(bannedPeerKey)); datajson != nil {
81 if err := json.Unmarshal(datajson, &sw.bannedPeer); err != nil {
89 // AddReactor adds the given reactor to the switch.
90 // NOTE: Not goroutine safe.
91 func (sw *Switch) AddReactor(name string, reactor Reactor) Reactor {
92 // Validate the reactor.
93 // No two reactors can share the same channel.
94 reactorChannels := reactor.GetChannels()
95 for _, chDesc := range reactorChannels {
97 if sw.reactorsByCh[chID] != nil {
98 cmn.PanicSanity(fmt.Sprintf("Channel %X has multiple reactors %v & %v", chID, sw.reactorsByCh[chID], reactor))
100 sw.chDescs = append(sw.chDescs, chDesc)
101 sw.reactorsByCh[chID] = reactor
103 sw.reactors[name] = reactor
104 reactor.SetSwitch(sw)
108 // Reactors returns a map of reactors registered on the switch.
109 // NOTE: Not goroutine safe.
110 func (sw *Switch) Reactors() map[string]Reactor {
114 // Reactor returns the reactor with the given name.
115 // NOTE: Not goroutine safe.
116 func (sw *Switch) Reactor(name string) Reactor {
117 return sw.reactors[name]
120 // AddListener adds the given listener to the switch for listening to incoming peer connections.
121 // NOTE: Not goroutine safe.
122 func (sw *Switch) AddListener(l Listener) {
123 sw.listeners = append(sw.listeners, l)
126 // Listeners returns the list of listeners the switch listens on.
127 // NOTE: Not goroutine safe.
128 func (sw *Switch) Listeners() []Listener {
132 // IsListening returns true if the switch has at least one listener.
133 // NOTE: Not goroutine safe.
134 func (sw *Switch) IsListening() bool {
135 return len(sw.listeners) > 0
138 // SetNodeInfo sets the switch's NodeInfo for checking compatibility and handshaking with other nodes.
139 // NOTE: Not goroutine safe.
140 func (sw *Switch) SetNodeInfo(nodeInfo *NodeInfo) {
141 sw.nodeInfo = nodeInfo
144 // NodeInfo returns the switch's NodeInfo.
145 // NOTE: Not goroutine safe.
146 func (sw *Switch) NodeInfo() *NodeInfo {
150 // SetNodeKey sets the switch's private key for authenticated encryption.
151 // NOTE: Not goroutine safe.
152 func (sw *Switch) SetNodePrivKey(nodePrivKey crypto.PrivKeyEd25519) {
153 sw.nodePrivKey = nodePrivKey
154 if sw.nodeInfo != nil {
155 sw.nodeInfo.PubKey = nodePrivKey.PubKey().Unwrap().(crypto.PubKeyEd25519)
159 // OnStart implements BaseService. It starts all the reactors, peers, and listeners.
160 func (sw *Switch) OnStart() error {
162 for _, reactor := range sw.reactors {
163 _, err := reactor.Start()
169 for _, listener := range sw.listeners {
170 go sw.listenerRoutine(listener)
175 // OnStop implements BaseService. It stops all listeners, peers, and reactors.
176 func (sw *Switch) OnStop() {
178 for _, listener := range sw.listeners {
183 for _, peer := range sw.peers.List() {
185 sw.peers.Remove(peer)
188 for _, reactor := range sw.reactors {
193 // addPeer performs the P2P handshake with a peer
194 // that already has a SecretConnection. If all goes well,
195 // it starts the peer and adds it to the switch.
196 // NOTE: This performs a blocking handshake before the peer is added.
197 // CONTRACT: If error is returned, peer is nil, and conn is immediately closed.
198 func (sw *Switch) AddPeer(pc *peerConn) error {
199 peerNodeInfo, err := pc.HandshakeTimeout(sw.nodeInfo, time.Duration(sw.peerConfig.HandshakeTimeout*time.Second))
201 return ErrConnectBannedPeer
203 // Check version, chain id
204 if err := sw.nodeInfo.CompatibleWith(peerNodeInfo); err != nil {
208 peer := newPeer(pc, peerNodeInfo, sw.reactorsByCh, sw.chDescs, sw.StopPeerForError)
211 if err := sw.filterConnByPeer(peer); err != nil {
217 if err := sw.startInitPeer(peer); err != nil {
222 // Add the peer to .peers.
223 // We start it first so that a peer in the list is safe to Stop.
224 // It should not err since we already checked peers.Has()
225 if err := sw.peers.Add(peer); err != nil {
229 log.Info("Added peer:", peer)
233 func (sw *Switch) startInitPeer(peer *Peer) error {
234 peer.Start() // spawn send/recv routines
235 for _, reactor := range sw.reactors {
236 if err := reactor.AddPeer(peer); err != nil {
243 // Dial a list of seeds asynchronously in random order
244 func (sw *Switch) DialSeeds(seeds []string) error {
245 netAddrs, err := NewNetAddressStrings(seeds)
250 if sw.addrBook != nil {
251 // add seeds to `addrBook`
252 ourAddr, _ := NewNetAddressString(sw.nodeInfo.ListenAddr)
253 for _, netAddr := range netAddrs {
254 // do not add ourselves
255 if netAddr.Equals(ourAddr) {
258 sw.addrBook.AddAddress(netAddr, ourAddr)
264 //permute the list, dial them in random order.
265 perm := rand.Perm(len(netAddrs))
266 for i := 0; i < len(perm); i += 2 {
268 sw.dialSeed(netAddrs[j])
274 func (sw *Switch) dialSeed(addr *NetAddress) {
275 err := sw.DialPeerWithAddress(addr)
277 log.Info("Error dialing seed:", addr.String())
281 func (sw *Switch) addrBookDelSelf() error {
282 addr, err := NewNetAddressString(sw.nodeInfo.ListenAddr)
286 // remove the given address from the address book if we're added it earlier
287 sw.addrBook.RemoveAddress(addr)
288 // add the given address to the address book to avoid dialing ourselves
289 // again this is our public address
290 sw.addrBook.AddOurAddress(addr)
294 func (sw *Switch) filterConnByIP(ip string) error {
295 if err := sw.checkBannedPeer(ip); err != nil {
296 return ErrConnectBannedPeer
299 if ip == sw.nodeInfo.ListenHost() {
301 return ErrConnectSelf
307 func (sw *Switch) filterConnByPeer(peer *Peer) error {
308 if err := sw.checkBannedPeer(peer.NodeInfo.RemoteAddrHost()); err != nil {
309 return ErrConnectBannedPeer
312 if sw.nodeInfo.PubKey.Equals(peer.PubKey().Wrap()) {
314 return ErrConnectSelf
317 // Check for duplicate peer
318 if sw.peers.Has(peer.Key) {
319 return ErrDuplicatePeer
324 func (sw *Switch) DialPeerWithAddress(addr *NetAddress) error {
325 log.Debug("Dialing peer address:", addr)
327 if err := sw.filterConnByIP(addr.IP.String()); err != nil {
331 sw.dialing.Set(addr.IP.String(), addr)
332 defer sw.dialing.Delete(addr.IP.String())
334 pc, err := newOutboundPeerConn(addr, sw.reactorsByCh, sw.chDescs, sw.StopPeerForError, sw.nodePrivKey, sw.peerConfig)
336 log.Debug("Failed to dial peer", " address:", addr, " error:", err)
342 log.Info("Failed to add peer:", addr, " err:", err)
346 log.Info("Dialed and added peer:", addr)
350 func (sw *Switch) IsDialing(addr *NetAddress) bool {
351 return sw.dialing.Has(addr.IP.String())
354 // Returns the count of outbound/inbound and outbound-dialing peers.
355 func (sw *Switch) NumPeers() (outbound, inbound, dialing int) {
356 peers := sw.peers.List()
357 for _, peer := range peers {
364 dialing = sw.dialing.Size()
368 func (sw *Switch) Peers() *PeerSet {
372 // StopPeerForError disconnects from a peer due to external error.
373 func (sw *Switch) StopPeerForError(peer *Peer, reason interface{}) {
374 log.Info("Stopping peer for error.", " peer:", peer, " err:", reason)
375 sw.stopAndRemovePeer(peer, reason)
378 // Disconnect from a peer gracefully.
379 func (sw *Switch) StopPeerGracefully(peer *Peer) {
380 log.Info("Stopping peer gracefully")
381 sw.stopAndRemovePeer(peer, nil)
384 func (sw *Switch) stopAndRemovePeer(peer *Peer, reason interface{}) {
385 for _, reactor := range sw.reactors {
386 reactor.RemovePeer(peer, reason)
388 sw.peers.Remove(peer)
392 func (sw *Switch) listenerRoutine(l Listener) {
394 inConn, ok := <-l.Connections()
399 // disconnect if we alrady have 2 * MaxNumPeers, we do this because we wanna address book get exchanged even if
400 // the connect is full. The pex will disconnect the peer after address exchange, the max connected peer won't
401 // be double of MaxNumPeers
402 if sw.peers.Size() >= sw.config.MaxNumPeers*2 {
404 log.Info("Ignoring inbound connection: already have enough peers.")
408 // New inbound connection!
409 err := sw.addPeerWithConnection(inConn)
411 log.Info("Ignoring inbound connection: error while adding peer.", " address:", inConn.RemoteAddr().String(), " error:", err)
417 func (sw *Switch) addPeerWithConnection(conn net.Conn) error {
418 peerConn, err := newInboundPeerConn(conn, sw.reactorsByCh, sw.chDescs, sw.StopPeerForError, sw.nodePrivKey, sw.config)
423 if err = sw.AddPeer(peerConn); err != nil {
431 func (sw *Switch) AddBannedPeer(peer *Peer) error {
433 defer sw.mtx.Unlock()
434 key := peer.NodeInfo.RemoteAddrHost()
435 sw.bannedPeer[key] = time.Now().Add(defaultBanDuration)
436 datajson, err := json.Marshal(sw.bannedPeer)
440 sw.db.Set([]byte(bannedPeerKey), datajson)
444 func (sw *Switch) delBannedPeer(addr string) error {
445 delete(sw.bannedPeer, addr)
446 datajson, err := json.Marshal(sw.bannedPeer)
450 sw.db.Set([]byte(bannedPeerKey), datajson)
454 func (sw *Switch) checkBannedPeer(peer string) error {
456 defer sw.mtx.Unlock()
458 if banEnd, ok := sw.bannedPeer[peer]; ok {
459 if time.Now().Before(banEnd) {
460 return ErrConnectBannedPeer
462 sw.delBannedPeer(peer)