7 log "github.com/sirupsen/logrus"
9 "github.com/vapor/config"
10 "github.com/vapor/errors"
11 "github.com/vapor/event"
12 "github.com/vapor/protocol/bc"
13 "github.com/vapor/protocol/bc/types"
14 "github.com/vapor/protocol/state"
18 maxSignatureCacheSize = 10000
22 errDoubleSignBlock = errors.New("the consensus is double sign in same height of different block")
23 errInvalidSignature = errors.New("the signature of block is invalid")
24 errSignForkChain = errors.New("can not sign fork before the irreversible block")
27 func signCacheKey(blockHash, pubkey string) string {
28 return fmt.Sprintf("%s:%s", blockHash, pubkey)
31 func (c *Chain) isIrreversible(blockHeader *types.BlockHeader) bool {
32 consensusNodes, err := c.getConsensusNodes(&blockHeader.PreviousBlockHash)
38 for i := 0; i < len(consensusNodes); i++ {
39 if blockHeader.BlockWitness.Get(uint64(i)) != nil {
44 return signCount > len(consensusNodes)*2/3
47 // GetConsensusResultByHash return vote result by block hash
48 func (c *Chain) GetConsensusResultByHash(blockHash *bc.Hash) (*state.ConsensusResult, error) {
49 blockHeader, err := c.store.GetBlockHeader(blockHash)
53 return c.getConsensusResult(state.CalcVoteSeq(blockHeader.Height), blockHeader)
56 // IsBlocker returns whether the consensus node is a blocker at the specified time
57 func (c *Chain) IsBlocker(prevBlockHash *bc.Hash, pubKey string, timeStamp uint64) (bool, error) {
58 xPub, err := c.GetBlocker(prevBlockHash, timeStamp)
62 return xPub == pubKey, nil
65 // ProcessBlockSignature process the received block signature messages
66 // return whether a block become irreversible, if so, the chain module must update status
67 func (c *Chain) ProcessBlockSignature(signature, xPub []byte, blockHash *bc.Hash) error {
68 xpubStr := hex.EncodeToString(xPub[:])
69 blockHeader, _ := c.store.GetBlockHeader(blockHash)
71 // save the signature if the block is not exist
72 if blockHeader == nil {
73 cacheKey := signCacheKey(blockHash.String(), xpubStr)
74 c.signatureCache.Add(cacheKey, signature)
78 consensusNode, err := c.getConsensusNode(&blockHeader.PreviousBlockHash, xpubStr)
83 if blockHeader.BlockWitness.Get(consensusNode.Order) != nil {
88 defer c.cond.L.Unlock()
89 if err := c.checkNodeSign(blockHeader, consensusNode, signature); err != nil {
93 if err := c.updateBlockSignature(blockHeader, consensusNode.Order, signature); err != nil {
96 return c.eventDispatcher.Post(event.BlockSignatureEvent{BlockHash: *blockHash, Signature: signature, XPub: xPub})
99 // validateSign verify the signatures of block, and return the number of correct signature
100 // if some signature is invalid, they will be reset to nil
101 // if the block does not have the signature of blocker, it will return error
102 func (c *Chain) validateSign(block *types.Block) error {
103 consensusNodeMap, err := c.getConsensusNodes(&block.PreviousBlockHash)
108 hasBlockerSign := false
109 blockHash := block.Hash()
110 for pubKey, node := range consensusNodeMap {
111 if len(block.Witness) <= int(node.Order) {
115 if block.Get(node.Order) == nil {
116 cachekey := signCacheKey(blockHash.String(), pubKey)
117 if signature, ok := c.signatureCache.Get(cachekey); ok {
118 block.Set(node.Order, signature.([]byte))
124 if err := c.checkNodeSign(&block.BlockHeader, node, block.Get(node.Order)); err == errDoubleSignBlock {
125 log.WithFields(log.Fields{"module": logModule, "blockHash": blockHash.String(), "pubKey": pubKey}).Warn("the consensus node double sign the same height of different block")
126 block.Delete(node.Order)
128 } else if err != nil {
132 isBlocker, err := c.IsBlocker(&block.PreviousBlockHash, pubKey, block.Timestamp)
138 hasBlockerSign = true
144 return errors.New("the block has no signature of the blocker")
149 func (c *Chain) checkNodeSign(bh *types.BlockHeader, consensusNode *state.ConsensusNode, signature []byte) error {
150 if !consensusNode.XPub.Verify(bh.Hash().Bytes(), signature) {
151 return errInvalidSignature
154 blockHashes, err := c.store.GetBlockHashesByHeight(bh.Height)
159 for _, blockHash := range blockHashes {
160 if *blockHash == bh.Hash() {
164 blockHeader, err := c.store.GetBlockHeader(blockHash)
169 consensusNode, err := c.getConsensusNode(&blockHeader.PreviousBlockHash, consensusNode.XPub.String())
170 if err != nil && err != errNotFoundConsensusNode {
174 if err == errNotFoundConsensusNode {
178 if blockHeader.BlockWitness.Get(consensusNode.Order) != nil {
179 return errDoubleSignBlock
185 // SignBlock signing the block if current node is consensus node
186 func (c *Chain) SignBlock(block *types.Block) ([]byte, error) {
187 xprv := config.CommonConfig.PrivateKey()
188 xpubStr := xprv.XPub().String()
189 node, err := c.getConsensusNode(&block.PreviousBlockHash, xpubStr)
190 if err == errNotFoundConsensusNode {
192 } else if err != nil {
196 //check double sign in same block height
197 blockHashes, err := c.store.GetBlockHashesByHeight(block.Height)
202 for _, hash := range blockHashes {
203 blockHeader, err := c.store.GetBlockHeader(hash)
208 // Has already signed the same height block
209 if blockHeader.BlockWitness.Get(node.Order) != nil {
214 signature := block.Get(node.Order)
215 if len(signature) == 0 {
216 signature = xprv.Sign(block.Hash().Bytes())
217 block.Set(node.Order, signature)
219 return signature, nil
222 func (c *Chain) updateBlockSignature(blockHeader *types.BlockHeader, nodeOrder uint64, signature []byte) error {
223 blockHeader.Set(nodeOrder, signature)
224 if err := c.store.SaveBlockHeader(blockHeader); err != nil {
228 if !c.isIrreversible(blockHeader) || blockHeader.Height <= c.lastIrrBlockHeader.Height {
232 if c.InMainChain(blockHeader.Hash()) {
233 if err := c.store.SaveChainStatus(c.bestBlockHeader, blockHeader, []*types.BlockHeader{}, state.NewUtxoViewpoint(), []*state.ConsensusResult{}); err != nil {
237 c.lastIrrBlockHeader = blockHeader
239 // block is on a forked chain
240 log.WithFields(log.Fields{"module": logModule}).Info("majority votes received on forked chain")
241 tail, err := c.traceLongestChainTail(blockHeader)
246 return c.reorganizeChain(tail)