8 log "github.com/sirupsen/logrus"
9 "gopkg.in/fatih/set.v0"
11 "github.com/bytom/consensus"
12 "github.com/bytom/errors"
13 "github.com/bytom/p2p/trust"
14 "github.com/bytom/protocol/bc"
15 "github.com/bytom/protocol/bc/types"
19 maxKnownTxs = 32768 // Maximum transactions hashes to keep in the known list (prevent DOS)
20 maxKnownBlocks = 1024 // Maximum block hashes to keep in the known list (prevent DOS)
21 defaultBanThreshold = uint64(100)
24 //BasePeer is the interface for connection level peer
25 type BasePeer interface {
28 ServiceFlag() consensus.ServiceFlag
29 TrySend(byte, interface{}) bool
32 //BasePeerSet is the intergace for connection level peer manager
33 type BasePeerSet interface {
34 AddBannedPeer(string) error
35 StopPeerGracefully(string)
38 // PeerInfo indicate peer status snap
39 type PeerInfo struct {
40 ID string `json:"peer_id"`
41 RemoteAddr string `json:"remote_addr"`
42 Height uint64 `json:"height"`
43 Delay uint32 `json:"delay"`
49 services consensus.ServiceFlag
52 banScore trust.DynamicBanScore
53 knownTxs *set.Set // Set of transaction hashes known to be known by this peer
54 knownBlocks *set.Set // Set of block hashes known to be known by this peer
55 filterAdds *set.Set // Set of addresses that the spv node cares about.
58 func newPeer(height uint64, hash *bc.Hash, basePeer BasePeer) *peer {
61 services: basePeer.ServiceFlag(),
65 knownBlocks: set.New(),
66 filterAdds: set.New(),
70 func (p *peer) Height() uint64 {
76 func (p *peer) addBanScore(persistent, transient uint64, reason string) bool {
77 score := p.banScore.Increase(persistent, transient)
78 if score > defaultBanThreshold {
79 log.WithFields(log.Fields{"address": p.Addr(), "score": score, "reason": reason}).Errorf("banning and disconnecting")
83 warnThreshold := defaultBanThreshold >> 1
84 if score > warnThreshold {
85 log.WithFields(log.Fields{"address": p.Addr(), "score": score, "reason": reason}).Warning("ban score increasing")
90 func (p *peer) addFilterAddresses(addresses [][]byte) {
94 if (!p.filterAdds.IsEmpty()) {
97 for _, address := range addresses {
98 p.filterAdds.Add(hex.EncodeToString(address))
102 func (p *peer) getBlockByHeight(height uint64) bool {
103 msg := struct{ BlockchainMessage }{&GetBlockMessage{Height: height}}
104 return p.TrySend(BlockchainChannel, msg)
107 func (p *peer) getBlocks(locator []*bc.Hash, stopHash *bc.Hash) bool {
108 msg := struct{ BlockchainMessage }{NewGetBlocksMessage(locator, stopHash)}
109 return p.TrySend(BlockchainChannel, msg)
112 func (p *peer) getHeaders(locator []*bc.Hash, stopHash *bc.Hash) bool {
113 msg := struct{ BlockchainMessage }{NewGetHeadersMessage(locator, stopHash)}
114 return p.TrySend(BlockchainChannel, msg)
117 func (p *peer) getPeerInfo() *PeerInfo {
119 defer p.mtx.RUnlock()
122 RemoteAddr: p.Addr().String(),
127 func (p *peer) isRelatedTx(tx *types.Tx) bool {
128 for _, input := range(tx.Inputs) {
129 switch inp := input.TypedInput.(type) {
130 case *types.SpendInput:
131 if p.filterAdds.Has(hex.EncodeToString(inp.ControlProgram)) {
136 for _, output := range(tx.Outputs) {
137 if p.filterAdds.Has(hex.EncodeToString(output.ControlProgram)) {
144 func (p *peer) isSPVNode() bool {
145 return !p.services.IsEnable(consensus.SFFullNode)
148 func (p *peer) markBlock(hash *bc.Hash) {
152 for p.knownBlocks.Size() >= maxKnownBlocks {
155 p.knownBlocks.Add(hash.String())
158 func (p *peer) markTransaction(hash *bc.Hash) {
162 for p.knownTxs.Size() >= maxKnownTxs {
165 p.knownTxs.Add(hash.String())
168 func (p *peer) sendBlock(block *types.Block) (bool, error) {
169 msg, err := NewBlockMessage(block)
171 return false, errors.Wrap(err, "fail on NewBlockMessage")
174 ok := p.TrySend(BlockchainChannel, struct{ BlockchainMessage }{msg})
176 blcokHash := block.Hash()
177 p.knownBlocks.Add(blcokHash.String())
182 func (p *peer) sendBlocks(blocks []*types.Block) (bool, error) {
183 msg, err := NewBlocksMessage(blocks)
185 return false, errors.Wrap(err, "fail on NewBlocksMessage")
188 if ok := p.TrySend(BlockchainChannel, struct{ BlockchainMessage }{msg}); !ok {
192 for _, block := range blocks {
193 blcokHash := block.Hash()
194 p.knownBlocks.Add(blcokHash.String())
199 func (p *peer) sendHeaders(headers []*types.BlockHeader) (bool, error) {
200 msg, err := NewHeadersMessage(headers)
202 return false, errors.New("fail on NewHeadersMessage")
205 ok := p.TrySend(BlockchainChannel, struct{ BlockchainMessage }{msg})
209 func (p *peer) sendTransactions(txs []*types.Tx) (bool, error) {
210 for _, tx := range txs {
211 if p.isSPVNode() && !p.isRelatedTx(tx) {
214 msg, err := NewTransactionMessage(tx)
216 return false, errors.Wrap(err, "failed to tx msg")
219 if p.knownTxs.Has(tx.ID.String()) {
222 if ok := p.TrySend(BlockchainChannel, struct{ BlockchainMessage }{msg}); !ok {
225 p.knownTxs.Add(tx.ID.String())
230 func (p *peer) setStatus(height uint64, hash *bc.Hash) {
237 type peerSet struct {
240 peers map[string]*peer
243 // newPeerSet creates a new peer set to track the active participants.
244 func newPeerSet(basePeerSet BasePeerSet) *peerSet {
246 BasePeerSet: basePeerSet,
247 peers: make(map[string]*peer),
251 func (ps *peerSet) addBanScore(peerID string, persistent, transient uint64, reason string) {
253 peer := ps.peers[peerID]
259 if ban := peer.addBanScore(persistent, transient, reason); !ban {
262 if err := ps.AddBannedPeer(peer.Addr().String()); err != nil {
263 log.WithField("err", err).Error("fail on add ban peer")
265 ps.removePeer(peerID)
268 func (ps *peerSet) addPeer(peer BasePeer, height uint64, hash *bc.Hash) {
270 defer ps.mtx.Unlock()
272 if _, ok := ps.peers[peer.ID()]; !ok {
273 ps.peers[peer.ID()] = newPeer(height, hash, peer)
276 log.WithField("ID", peer.ID()).Warning("add existing peer to blockKeeper")
279 func (ps *peerSet) bestPeer(flag consensus.ServiceFlag) *peer {
281 defer ps.mtx.RUnlock()
284 for _, p := range ps.peers {
285 if !p.services.IsEnable(flag) {
288 if bestPeer == nil || p.height > bestPeer.height {
295 func (ps *peerSet) broadcastMinedBlock(block *types.Block) error {
296 msg, err := NewMinedBlockMessage(block)
298 return errors.Wrap(err, "fail on broadcast mined block")
302 peers := ps.peersWithoutBlock(&hash)
303 for _, peer := range peers {
304 if ok := peer.TrySend(BlockchainChannel, struct{ BlockchainMessage }{msg}); !ok {
305 ps.removePeer(peer.ID())
308 peer.markBlock(&hash)
313 func (ps *peerSet) broadcastNewStatus(bestBlock, genesisBlock *types.Block) error {
314 genesisHash := genesisBlock.Hash()
315 msg := NewStatusResponseMessage(&bestBlock.BlockHeader, &genesisHash)
316 for _, peer := range ps.peers {
317 if ok := peer.TrySend(BlockchainChannel, struct{ BlockchainMessage }{msg}); !ok {
318 ps.removePeer(peer.ID())
325 func (ps *peerSet) broadcastTx(tx *types.Tx) error {
326 msg, err := NewTransactionMessage(tx)
328 return errors.Wrap(err, "fail on broadcast tx")
331 peers := ps.peersWithoutTx(&tx.ID)
332 for _, peer := range peers {
333 if peer.isSPVNode() && !peer.isRelatedTx(tx) {
336 if ok := peer.TrySend(BlockchainChannel, struct{ BlockchainMessage }{msg}); !ok {
337 ps.removePeer(peer.ID())
340 peer.markTransaction(&tx.ID)
345 func (ps *peerSet) errorHandler(peerID string, err error) {
346 if errors.Root(err) == errPeerMisbehave {
347 ps.addBanScore(peerID, 20, 0, err.Error())
349 ps.removePeer(peerID)
353 // Peer retrieves the registered peer with the given id.
354 func (ps *peerSet) getPeer(id string) *peer {
356 defer ps.mtx.RUnlock()
360 func (ps *peerSet) getPeerInfos() []*PeerInfo {
362 defer ps.mtx.RUnlock()
364 result := []*PeerInfo{}
365 for _, peer := range ps.peers {
366 result = append(result, peer.getPeerInfo())
371 func (ps *peerSet) peersWithoutBlock(hash *bc.Hash) []*peer {
373 defer ps.mtx.RUnlock()
376 for _, peer := range ps.peers {
377 if !peer.knownBlocks.Has(hash.String()) {
378 peers = append(peers, peer)
384 func (ps *peerSet) peersWithoutTx(hash *bc.Hash) []*peer {
386 defer ps.mtx.RUnlock()
389 for _, peer := range ps.peers {
390 if !peer.knownTxs.Has(hash.String()) {
391 peers = append(peers, peer)
397 func (ps *peerSet) removePeer(peerID string) {
399 delete(ps.peers, peerID)
401 ps.StopPeerGracefully(peerID)