6 log "github.com/sirupsen/logrus"
7 "gopkg.in/fatih/set.v0"
9 "github.com/bytom/errors"
10 "github.com/bytom/p2p"
11 "github.com/bytom/p2p/trust"
12 "github.com/bytom/protocol/bc"
13 "github.com/bytom/protocol/bc/types"
17 errClosed = errors.New("peer set is closed")
18 errAlreadyRegistered = errors.New("peer is already registered")
19 errNotRegistered = errors.New("peer is not registered")
24 defaultBanThreshold = uint64(100)
29 version int // Protocol version negotiated
33 banScore trust.DynamicBanScore
37 knownTxs *set.Set // Set of transaction hashes known to be known by this peer
38 knownBlocks *set.Set // Set of block hashes known to be known by this peer
41 func newPeer(height uint64, hash *bc.Hash, Peer *p2p.Peer) *peer {
43 version: defaultVersion,
49 knownBlocks: set.New(),
53 func (p *peer) GetStatus() (height uint64, hash *bc.Hash) {
56 return p.height, p.hash
59 func (p *peer) SetStatus(height uint64, hash *bc.Hash) {
67 func (p *peer) requestBlockByHash(hash *bc.Hash) error {
68 msg := &BlockRequestMessage{RawHash: hash.Byte32()}
69 p.swPeer.TrySend(BlockchainChannel, struct{ BlockchainMessage }{msg})
73 func (p *peer) requestBlockByHeight(height uint64) error {
74 msg := &BlockRequestMessage{Height: height}
75 p.swPeer.TrySend(BlockchainChannel, struct{ BlockchainMessage }{msg})
79 func (p *peer) SendTransactions(txs []*types.Tx) error {
80 for _, tx := range txs {
81 msg, err := NewTransactionNotifyMessage(tx)
83 return errors.New("Failed construction tx msg")
86 p.knownTxs.Add(hash.String())
87 p.swPeer.TrySend(BlockchainChannel, struct{ BlockchainMessage }{msg})
92 func (p *peer) getPeer() *p2p.Peer {
99 // MarkTransaction marks a transaction as known for the peer, ensuring that it
100 // will never be propagated to this particular peer.
101 func (p *peer) MarkTransaction(hash *bc.Hash) {
105 // If we reached the memory allowance, drop a previously known transaction hash
106 for p.knownTxs.Size() >= maxKnownTxs {
109 p.knownTxs.Add(hash.String())
112 // MarkBlock marks a block as known for the peer, ensuring that the block will
113 // never be propagated to this particular peer.
114 func (p *peer) MarkBlock(hash *bc.Hash) {
118 // If we reached the memory allowance, drop a previously known block hash
119 for p.knownBlocks.Size() >= maxKnownBlocks {
122 p.knownBlocks.Add(hash.String())
125 // addBanScore increases the persistent and decaying ban score fields by the
126 // values passed as parameters. If the resulting score exceeds half of the ban
127 // threshold, a warning is logged including the reason provided. Further, if
128 // the score is above the ban threshold, the peer will be banned and
130 func (p *peer) addBanScore(persistent, transient uint64, reason string) bool {
131 warnThreshold := defaultBanThreshold >> 1
132 if transient == 0 && persistent == 0 {
133 // The score is not being increased, but a warning message is still
134 // logged if the score is above the warn threshold.
135 score := p.banScore.Int()
136 if score > warnThreshold {
137 log.Infof("Misbehaving peer %s: %s -- ban score is %d, "+"it was not increased this time", p.id, reason, score)
141 score := p.banScore.Increase(persistent, transient)
142 if score > warnThreshold {
143 log.Infof("Misbehaving peer %s: %s -- ban score increased to %d", p.id, reason, score)
144 if score > defaultBanThreshold {
145 log.Errorf("Misbehaving peer %s -- banning and disconnecting", p.id)
152 type peerSet struct {
153 peers map[string]*peer
158 // newPeerSet creates a new peer set to track the active participants.
159 func newPeerSet() *peerSet {
161 peers: make(map[string]*peer),
165 // Register injects a new peer into the working set, or returns an error if the
166 // peer is already known.
167 func (ps *peerSet) Register(p *peer) error {
169 defer ps.lock.Unlock()
174 if _, ok := ps.peers[p.id]; ok {
175 return errAlreadyRegistered
181 // Unregister removes a remote peer from the active set, disabling any further
182 // actions to/from that particular entity.
183 func (ps *peerSet) Unregister(id string) error {
185 defer ps.lock.Unlock()
187 if _, ok := ps.peers[id]; !ok {
188 return errNotRegistered
194 // Peer retrieves the registered peer with the given id.
195 func (ps *peerSet) Peer(id string) *peer {
197 defer ps.lock.RUnlock()
202 // Len returns if the current number of peers in the set.
203 func (ps *peerSet) Len() int {
205 defer ps.lock.RUnlock()
210 // MarkTransaction marks a transaction as known for the peer, ensuring that it
211 // will never be propagated to this particular peer.
212 func (ps *peerSet) MarkTransaction(peerID string, hash *bc.Hash) {
214 defer ps.lock.RUnlock()
216 if peer, ok := ps.peers[peerID]; ok {
217 peer.MarkTransaction(hash)
221 // MarkBlock marks a block as known for the peer, ensuring that the block will
222 // never be propagated to this particular peer.
223 func (ps *peerSet) MarkBlock(peerID string, hash *bc.Hash) {
225 defer ps.lock.RUnlock()
227 if peer, ok := ps.peers[peerID]; ok {
232 // PeersWithoutBlock retrieves a list of peers that do not have a given block in
233 // their set of known hashes.
234 func (ps *peerSet) PeersWithoutBlock(hash *bc.Hash) []*peer {
236 defer ps.lock.RUnlock()
238 list := make([]*peer, 0, len(ps.peers))
239 for _, p := range ps.peers {
240 if !p.knownBlocks.Has(hash.String()) {
241 list = append(list, p)
247 // PeersWithoutTx retrieves a list of peers that do not have a given transaction
248 // in their set of known hashes.
249 func (ps *peerSet) PeersWithoutTx(hash *bc.Hash) []*peer {
251 defer ps.lock.RUnlock()
253 list := make([]*peer, 0, len(ps.peers))
254 for _, p := range ps.peers {
255 if !p.knownTxs.Has(hash.String()) {
256 list = append(list, p)
262 // BestPeer retrieves the known peer with the currently highest total difficulty.
263 func (ps *peerSet) BestPeer() (*p2p.Peer, uint64) {
265 defer ps.lock.RUnlock()
267 var bestPeer *p2p.Peer
268 var bestHeight uint64
270 for _, p := range ps.peers {
271 if bestPeer == nil || p.height > bestHeight {
272 bestPeer, bestHeight = p.swPeer, p.height
276 return bestPeer, bestHeight
279 // Close disconnects all peers.
280 // No new peers can be registered after Close has returned.
281 func (ps *peerSet) Close() {
283 defer ps.lock.Unlock()
285 for _, p := range ps.peers {
291 func (ps *peerSet) AddPeer(peer *p2p.Peer) {
293 defer ps.lock.Unlock()
295 if _, ok := ps.peers[peer.Key]; !ok {
296 keeperPeer := newPeer(0, nil, peer)
297 ps.peers[peer.Key] = keeperPeer
298 log.WithFields(log.Fields{"ID": peer.Key}).Info("Add new peer to blockKeeper")
301 log.WithField("ID", peer.Key).Warning("Add existing peer to blockKeeper")
304 func (ps *peerSet) RemovePeer(peerID string) {
306 defer ps.lock.Unlock()
308 delete(ps.peers, peerID)
309 log.WithField("ID", peerID).Info("Delete peer from peerset")
312 func (ps *peerSet) SetPeerStatus(peerID string, height uint64, hash *bc.Hash) {
314 defer ps.lock.Unlock()
316 if peer, ok := ps.peers[peerID]; ok {
317 peer.SetStatus(height, hash)
321 func (ps *peerSet) requestBlockByHash(peerID string, hash *bc.Hash) error {
323 defer ps.lock.Unlock()
325 peer, ok := ps.peers[peerID]
327 return errors.New("Can't find peer. ")
329 return peer.requestBlockByHash(hash)
332 func (ps *peerSet) requestBlockByHeight(peerID string, height uint64) error {
334 defer ps.lock.Unlock()
336 peer, ok := ps.peers[peerID]
338 return errors.New("Can't find peer. ")
340 return peer.requestBlockByHeight(height)
343 func (ps *peerSet) BroadcastMinedBlock(block *types.Block) ([]*peer, error) {
344 msg, err := NewMinedBlockMessage(block)
346 return nil, errors.New("Failed construction block msg")
349 peers := ps.PeersWithoutBlock(&hash)
350 abnormalPeers := make([]*peer, 0)
351 for _, peer := range peers {
352 if ok := peer.swPeer.Send(BlockchainChannel, struct{ BlockchainMessage }{msg}); !ok {
353 abnormalPeers = append(abnormalPeers, peer)
356 ps.MarkBlock(peer.swPeer.Key, &hash)
358 return abnormalPeers, nil
361 func (ps *peerSet) BroadcastNewStatus(block *types.Block) ([]*peer, error) {
362 return ps.BroadcastMinedBlock(block)
365 func (ps *peerSet) BroadcastTx(tx *types.Tx) ([]*peer, error) {
366 msg, err := NewTransactionNotifyMessage(tx)
368 return nil, errors.New("Failed construction tx msg")
370 peers := ps.PeersWithoutTx(&tx.ID)
371 abnormalPeers := make([]*peer, 0)
372 for _, peer := range peers {
373 if ok := peer.swPeer.Send(BlockchainChannel, struct{ BlockchainMessage }{msg}); !ok {
374 abnormalPeers = append(abnormalPeers, peer)
377 ps.peers[peer.swPeer.Key].MarkTransaction(&tx.ID)
379 return abnormalPeers, nil