7 log "github.com/sirupsen/logrus"
9 "github.com/bytom/vapor/config"
10 "github.com/bytom/vapor/crypto/ed25519/chainkd"
11 "github.com/bytom/vapor/errors"
12 "github.com/bytom/vapor/event"
13 "github.com/bytom/vapor/protocol/bc"
14 "github.com/bytom/vapor/protocol/bc/types"
15 "github.com/bytom/vapor/protocol/state"
19 maxSignatureCacheSize = 10000
23 errDoubleSignBlock = errors.New("the consensus is double sign in same height of different block")
24 errInvalidSignature = errors.New("the signature of block is invalid")
25 errSignForkChain = errors.New("can not sign fork before the irreversible block")
28 func signCacheKey(blockHash, pubkey string) string {
29 return fmt.Sprintf("%s:%s", blockHash, pubkey)
32 func (c *Chain) checkDoubleSign(bh *types.BlockHeader, xPub string) error {
33 blockHashes, err := c.store.GetBlockHashesByHeight(bh.Height)
38 for _, blockHash := range blockHashes {
39 if *blockHash == bh.Hash() {
43 blockHeader, err := c.store.GetBlockHeader(blockHash)
48 consensusNode, err := c.getConsensusNode(&blockHeader.PreviousBlockHash, xPub)
49 if err == errNotFoundConsensusNode {
51 } else if err != nil {
55 if blockHeader.BlockWitness.Get(consensusNode.Order) != nil {
56 return errDoubleSignBlock
62 func (c *Chain) checkNodeSign(bh *types.BlockHeader, consensusNode *state.ConsensusNode, signature []byte) error {
63 if !consensusNode.XPub.Verify(bh.Hash().Bytes(), signature) {
64 return errInvalidSignature
67 return c.checkDoubleSign(bh, consensusNode.XPub.String())
70 func (c *Chain) isIrreversible(blockHeader *types.BlockHeader) bool {
71 consensusNodes, err := c.getConsensusNodes(&blockHeader.PreviousBlockHash)
77 for i := 0; i < len(consensusNodes); i++ {
78 if blockHeader.BlockWitness.Get(uint64(i)) != nil {
83 return signCount > len(consensusNodes)*2/3
86 func (c *Chain) updateBlockSignature(blockHeader *types.BlockHeader, nodeOrder uint64, signature []byte) error {
87 blockHeader.Set(nodeOrder, signature)
88 if err := c.store.SaveBlockHeader(blockHeader); err != nil {
92 if !c.isIrreversible(blockHeader) || blockHeader.Height <= c.lastIrrBlockHeader.Height {
96 if c.InMainChain(blockHeader.Hash()) {
97 if err := c.store.SaveChainStatus(c.bestBlockHeader, blockHeader, []*types.BlockHeader{}, state.NewUtxoViewpoint(), []*state.ConsensusResult{}); err != nil {
101 c.lastIrrBlockHeader = blockHeader
103 // block is on a forked chain
104 log.WithFields(log.Fields{"module": logModule}).Info("majority votes received on forked chain")
105 tail, err := c.traceLongestChainTail(blockHeader)
110 return c.reorganizeChain(tail)
115 // validateSign verify the signatures of block, and return the number of correct signature
116 // if some signature is invalid, they will be reset to nil
117 // if the block does not have the signature of blocker, it will return error
118 func (c *Chain) validateSign(block *types.Block) error {
119 consensusNodeMap, err := c.getConsensusNodes(&block.PreviousBlockHash)
124 blocker, err := c.GetBlocker(&block.PreviousBlockHash, block.Timestamp)
129 hasBlockerSign := false
130 blockHash := block.Hash()
131 for pubKey, node := range consensusNodeMap {
132 if block.BlockWitness.Get(node.Order) == nil {
133 cachekey := signCacheKey(blockHash.String(), pubKey)
134 if signature, ok := c.signatureCache.Get(cachekey); ok {
135 block.Set(node.Order, signature.([]byte))
136 c.eventDispatcher.Post(event.BlockSignatureEvent{BlockHash: blockHash, Signature: signature.([]byte), XPub: node.XPub[:]})
137 c.signatureCache.Remove(cachekey)
143 if err := c.checkNodeSign(&block.BlockHeader, node, block.Get(node.Order)); err == errDoubleSignBlock {
144 log.WithFields(log.Fields{"module": logModule, "blockHash": blockHash.String(), "pubKey": pubKey}).Warn("the consensus node double sign the same height of different block")
145 // if the blocker double sign & become the mainchain, that means
146 // all the side chain will reject the main chain make the chain
147 // fork. All the node will ban each other & can't roll back
148 if blocker != pubKey {
149 block.BlockWitness.Delete(node.Order)
152 } else if err != nil {
156 if blocker == pubKey {
157 hasBlockerSign = true
162 return errors.New("the block has no signature of the blocker")
167 // ProcessBlockSignature process the received block signature messages
168 // return whether a block become irreversible, if so, the chain module must update status
169 func (c *Chain) ProcessBlockSignature(signature, xPub []byte, blockHash *bc.Hash) error {
170 xpubStr := hex.EncodeToString(xPub[:])
171 blockHeader, _ := c.store.GetBlockHeader(blockHash)
173 // save the signature if the block is not exist
174 if blockHeader == nil {
175 var xPubKey chainkd.XPub
176 copy(xPubKey[:], xPub[:])
177 if !xPubKey.Verify(blockHash.Bytes(), signature) {
178 return errInvalidSignature
181 cacheKey := signCacheKey(blockHash.String(), xpubStr)
182 c.signatureCache.Add(cacheKey, signature)
186 consensusNode, err := c.getConsensusNode(&blockHeader.PreviousBlockHash, xpubStr)
191 if blockHeader.BlockWitness.Get(consensusNode.Order) != nil {
196 defer c.cond.L.Unlock()
197 if err := c.checkNodeSign(blockHeader, consensusNode, signature); err != nil {
201 if err := c.updateBlockSignature(blockHeader, consensusNode.Order, signature); err != nil {
204 return c.eventDispatcher.Post(event.BlockSignatureEvent{BlockHash: *blockHash, Signature: signature, XPub: xPub})
207 // SignBlockHeader signing the block if current node is consensus node
208 func (c *Chain) SignBlockHeader(blockHeader *types.BlockHeader) error {
210 defer c.cond.L.Unlock()
212 _, err := c.signBlockHeader(blockHeader)
217 return c.store.SaveBlockHeader(blockHeader)
220 func (c *Chain) applyBlockSign(blockHeader *types.BlockHeader) error {
221 signature, err := c.signBlockHeader(blockHeader)
226 if len(signature) == 0 {
230 if err := c.store.SaveBlockHeader(blockHeader); err != nil {
234 xpub := config.CommonConfig.PrivateKey().XPub()
235 return c.eventDispatcher.Post(event.BlockSignatureEvent{BlockHash: blockHeader.Hash(), Signature: signature, XPub: xpub[:]})
238 func (c *Chain) signBlockHeader(blockHeader *types.BlockHeader) ([]byte, error) {
239 xprv := config.CommonConfig.PrivateKey()
241 node, err := c.getConsensusNode(&blockHeader.PreviousBlockHash, xpub.String())
242 blockHash := blockHeader.Hash()
243 if err == errNotFoundConsensusNode {
244 log.WithFields(log.Fields{"module": logModule, "blockHash": blockHash.String()}).Debug("can't find consensus node of current node")
246 } else if err != nil {
250 if len(blockHeader.Get(node.Order)) != 0 {
254 if err := c.checkDoubleSign(blockHeader, node.XPub.String()); err == errDoubleSignBlock {
255 log.WithFields(log.Fields{"module": logModule, "blockHash": blockHash.String()}).Warn("current node has double sign the block")
257 } else if err != nil {
261 signature := xprv.Sign(blockHeader.Hash().Bytes())
262 blockHeader.Set(node.Order, signature)
263 return signature, nil