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) getRelatedTxAndStatus(txs []*types.Tx, txStatuses *bc.TransactionStatus) ([]*types.Tx, []*bc.TxVerifyResult) {
128 var relatedTxs []*types.Tx
129 var relatedStatuses []*bc.TxVerifyResult
130 for i, tx := range txs {
131 if p.isRelatedTx(tx) {
132 relatedTxs = append(relatedTxs, tx)
133 relatedStatuses = append(relatedStatuses, txStatuses.VerifyStatus[i])
136 return relatedTxs, relatedStatuses
139 func (p *peer) isRelatedTx(tx *types.Tx) bool {
140 for _, input := range tx.Inputs {
141 switch inp := input.TypedInput.(type) {
142 case *types.SpendInput:
143 if p.filterAdds.Has(hex.EncodeToString(inp.ControlProgram)) {
148 for _, output := range tx.Outputs {
149 if p.filterAdds.Has(hex.EncodeToString(output.ControlProgram)) {
156 func (p *peer) isSPVNode() bool {
157 return !p.services.IsEnable(consensus.SFFullNode)
160 func (p *peer) markBlock(hash *bc.Hash) {
164 for p.knownBlocks.Size() >= maxKnownBlocks {
167 p.knownBlocks.Add(hash.String())
170 func (p *peer) markTransaction(hash *bc.Hash) {
174 for p.knownTxs.Size() >= maxKnownTxs {
177 p.knownTxs.Add(hash.String())
180 func (p *peer) sendBlock(block *types.Block) (bool, error) {
181 msg, err := NewBlockMessage(block)
183 return false, errors.Wrap(err, "fail on NewBlockMessage")
186 ok := p.TrySend(BlockchainChannel, struct{ BlockchainMessage }{msg})
188 blcokHash := block.Hash()
189 p.knownBlocks.Add(blcokHash.String())
194 func (p *peer) sendBlocks(blocks []*types.Block) (bool, error) {
195 msg, err := NewBlocksMessage(blocks)
197 return false, errors.Wrap(err, "fail on NewBlocksMessage")
200 if ok := p.TrySend(BlockchainChannel, struct{ BlockchainMessage }{msg}); !ok {
204 for _, block := range blocks {
205 blcokHash := block.Hash()
206 p.knownBlocks.Add(blcokHash.String())
211 func (p *peer) sendHeaders(headers []*types.BlockHeader) (bool, error) {
212 msg, err := NewHeadersMessage(headers)
214 return false, errors.New("fail on NewHeadersMessage")
217 ok := p.TrySend(BlockchainChannel, struct{ BlockchainMessage }{msg})
221 func (p *peer) sendMerkleBlock(block *types.Block, txStatuses *bc.TransactionStatus) (bool, error) {
222 msg := NewMerkleBlockMessage()
223 if err := msg.setRawBlockHeader(block.BlockHeader); err != nil {
227 relatedTxs, relatedStatuses := p.getRelatedTxAndStatus(block.Transactions, txStatuses)
229 txHashes, txFlags := types.GetTxMerkleTreeProof(block.Transactions, relatedTxs)
230 if err := msg.setTxInfo(txHashes, txFlags, relatedTxs); err != nil {
234 statusHashes := types.GetStatusMerkleTreeProof(txStatuses.VerifyStatus, txFlags)
235 if err := msg.setStatusInfo(statusHashes, relatedStatuses); err != nil {
239 ok := p.TrySend(BlockchainChannel, struct{ BlockchainMessage }{msg})
243 func (p *peer) sendTransactions(txs []*types.Tx) (bool, error) {
244 for _, tx := range txs {
245 if p.isSPVNode() && !p.isRelatedTx(tx) {
248 msg, err := NewTransactionMessage(tx)
250 return false, errors.Wrap(err, "failed to tx msg")
253 if p.knownTxs.Has(tx.ID.String()) {
256 if ok := p.TrySend(BlockchainChannel, struct{ BlockchainMessage }{msg}); !ok {
259 p.knownTxs.Add(tx.ID.String())
264 func (p *peer) setStatus(height uint64, hash *bc.Hash) {
271 type peerSet struct {
274 peers map[string]*peer
277 // newPeerSet creates a new peer set to track the active participants.
278 func newPeerSet(basePeerSet BasePeerSet) *peerSet {
280 BasePeerSet: basePeerSet,
281 peers: make(map[string]*peer),
285 func (ps *peerSet) addBanScore(peerID string, persistent, transient uint64, reason string) {
287 peer := ps.peers[peerID]
293 if ban := peer.addBanScore(persistent, transient, reason); !ban {
296 if err := ps.AddBannedPeer(peer.Addr().String()); err != nil {
297 log.WithField("err", err).Error("fail on add ban peer")
299 ps.removePeer(peerID)
302 func (ps *peerSet) addPeer(peer BasePeer, height uint64, hash *bc.Hash) {
304 defer ps.mtx.Unlock()
306 if _, ok := ps.peers[peer.ID()]; !ok {
307 ps.peers[peer.ID()] = newPeer(height, hash, peer)
310 log.WithField("ID", peer.ID()).Warning("add existing peer to blockKeeper")
313 func (ps *peerSet) bestPeer(flag consensus.ServiceFlag) *peer {
315 defer ps.mtx.RUnlock()
318 for _, p := range ps.peers {
319 if !p.services.IsEnable(flag) {
322 if bestPeer == nil || p.height > bestPeer.height {
329 func (ps *peerSet) broadcastMinedBlock(block *types.Block) error {
330 msg, err := NewMinedBlockMessage(block)
332 return errors.Wrap(err, "fail on broadcast mined block")
336 peers := ps.peersWithoutBlock(&hash)
337 for _, peer := range peers {
338 if peer.isSPVNode() {
341 if ok := peer.TrySend(BlockchainChannel, struct{ BlockchainMessage }{msg}); !ok {
342 ps.removePeer(peer.ID())
345 peer.markBlock(&hash)
350 func (ps *peerSet) broadcastNewStatus(bestBlock, genesisBlock *types.Block) error {
351 genesisHash := genesisBlock.Hash()
352 msg := NewStatusResponseMessage(&bestBlock.BlockHeader, &genesisHash)
353 for _, peer := range ps.peers {
354 if ok := peer.TrySend(BlockchainChannel, struct{ BlockchainMessage }{msg}); !ok {
355 ps.removePeer(peer.ID())
362 func (ps *peerSet) broadcastTx(tx *types.Tx) error {
363 msg, err := NewTransactionMessage(tx)
365 return errors.Wrap(err, "fail on broadcast tx")
368 peers := ps.peersWithoutTx(&tx.ID)
369 for _, peer := range peers {
370 if peer.isSPVNode() && !peer.isRelatedTx(tx) {
373 if ok := peer.TrySend(BlockchainChannel, struct{ BlockchainMessage }{msg}); !ok {
374 ps.removePeer(peer.ID())
377 peer.markTransaction(&tx.ID)
382 func (ps *peerSet) errorHandler(peerID string, err error) {
383 if errors.Root(err) == errPeerMisbehave {
384 ps.addBanScore(peerID, 20, 0, err.Error())
386 ps.removePeer(peerID)
390 // Peer retrieves the registered peer with the given id.
391 func (ps *peerSet) getPeer(id string) *peer {
393 defer ps.mtx.RUnlock()
397 func (ps *peerSet) getPeerInfos() []*PeerInfo {
399 defer ps.mtx.RUnlock()
401 result := []*PeerInfo{}
402 for _, peer := range ps.peers {
403 result = append(result, peer.getPeerInfo())
408 func (ps *peerSet) peersWithoutBlock(hash *bc.Hash) []*peer {
410 defer ps.mtx.RUnlock()
413 for _, peer := range ps.peers {
414 if !peer.knownBlocks.Has(hash.String()) {
415 peers = append(peers, peer)
421 func (ps *peerSet) peersWithoutTx(hash *bc.Hash) []*peer {
423 defer ps.mtx.RUnlock()
426 for _, peer := range ps.peers {
427 if !peer.knownTxs.Has(hash.String()) {
428 peers = append(peers, peer)
434 func (ps *peerSet) removePeer(peerID string) {
436 delete(ps.peers, peerID)
438 ps.StopPeerGracefully(peerID)