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 errVotingOperationOverFlow = errors.New("voting operation result overflow")
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) isIrreversible(blockHeader *types.BlockHeader) bool {
33 consensusNodes, err := c.getConsensusNodes(&blockHeader.PreviousBlockHash)
39 for i := 0; i < len(consensusNodes); i++ {
40 if blockHeader.BlockWitness.Get(uint64(i)) != nil {
45 return signCount > len(consensusNodes)*2/3
48 // GetVoteResultByHash return vote result by block hash
49 func (c *Chain) GetVoteResultByHash(blockHash *bc.Hash) (*state.VoteResult, error) {
50 blockHeader, err := c.store.GetBlockHeader(blockHash)
54 return c.getVoteResult(state.CalcVoteSeq(blockHeader.Height), blockHeader)
57 // IsBlocker returns whether the consensus node is a blocker at the specified time
58 func (c *Chain) IsBlocker(prevBlockHash *bc.Hash, pubKey string, timeStamp uint64) (bool, error) {
59 xPub, err := c.GetBlocker(prevBlockHash, timeStamp)
63 return xPub == pubKey, nil
66 // ProcessBlockSignature process the received block signature messages
67 // return whether a block become irreversible, if so, the chain module must update status
68 func (c *Chain) ProcessBlockSignature(signature, xPub []byte, blockHash *bc.Hash) error {
69 xpubStr := hex.EncodeToString(xPub[:])
70 blockHeader, _ := c.store.GetBlockHeader(blockHash)
72 // save the signature if the block is not exist
73 if blockHeader == nil {
74 cacheKey := signCacheKey(blockHash.String(), xpubStr)
75 c.signatureCache.Add(cacheKey, signature)
79 consensusNode, err := c.getConsensusNode(&blockHeader.PreviousBlockHash, xpubStr)
84 if blockHeader.BlockWitness.Get(consensusNode.Order) != nil {
89 defer c.cond.L.Unlock()
90 if err := c.checkNodeSign(blockHeader, consensusNode, signature); err != nil {
94 if err := c.updateBlockSignature(blockHeader, consensusNode.Order, signature); err != nil {
97 return c.eventDispatcher.Post(event.BlockSignatureEvent{BlockHash: *blockHash, Signature: signature, XPub: xPub})
100 // validateSign verify the signatures of block, and return the number of correct signature
101 // if some signature is invalid, they will be reset to nil
102 // if the block has not the signature of blocker, it will return error
103 func (c *Chain) validateSign(block *types.Block) error {
104 consensusNodeMap, err := c.getConsensusNodes(&block.PreviousBlockHash)
109 hasBlockerSign := false
110 blockHash := block.Hash()
111 for pubKey, node := range consensusNodeMap {
112 if len(block.Witness) <= int(node.Order) {
116 if block.Get(node.Order) == nil {
117 cachekey := signCacheKey(blockHash.String(), pubKey)
118 if signature, ok := c.signatureCache.Get(cachekey); ok {
119 block.Set(node.Order, signature.([]byte))
125 if err := c.checkNodeSign(&block.BlockHeader, node, block.Get(node.Order)); err == errDoubleSignBlock {
126 log.WithFields(log.Fields{"module": logModule, "blockHash": blockHash.String(), "pubKey": pubKey}).Warn("the consensus node double sign the same height of different block")
127 block.Delete(node.Order)
129 } else if err != nil {
133 isBlocker, err := c.IsBlocker(&block.PreviousBlockHash, pubKey, block.Timestamp)
139 hasBlockerSign = true
145 return errors.New("the block has no signature of the blocker")
150 func (c *Chain) checkNodeSign(bh *types.BlockHeader, consensusNode *state.ConsensusNode, signature []byte) error {
151 if !consensusNode.XPub.Verify(bh.Hash().Bytes(), signature) {
152 return errInvalidSignature
155 blockHashes, err := c.store.GetBlockHashesByHeight(bh.Height)
160 for _, blockHash := range blockHashes {
161 if *blockHash == bh.Hash() {
165 blockHeader, err := c.store.GetBlockHeader(blockHash)
170 consensusNode, err := c.getConsensusNode(&blockHeader.PreviousBlockHash, consensusNode.XPub.String())
171 if err != nil && err != errNotFoundConsensusNode {
175 if err == errNotFoundConsensusNode {
179 if blockHeader.BlockWitness.Get(consensusNode.Order) != nil {
180 return errDoubleSignBlock
186 // SignBlock signing the block if current node is consensus node
187 func (c *Chain) SignBlock(block *types.Block) ([]byte, error) {
188 xprv := config.CommonConfig.PrivateKey()
189 xpubStr := xprv.XPub().String()
190 node, err := c.getConsensusNode(&block.PreviousBlockHash, xpubStr)
191 if err == errNotFoundConsensusNode {
193 } else if err != nil {
197 //check double sign in same block height
198 blockHashes, err := c.store.GetBlockHashesByHeight(block.Height)
203 for _, hash := range blockHashes {
204 blockHeader, err := c.store.GetBlockHeader(hash)
209 // Has already signed the same height block
210 if blockHeader.BlockWitness.Get(node.Order) != nil {
215 signature := block.Get(node.Order)
216 if len(signature) == 0 {
217 signature = xprv.Sign(block.Hash().Bytes())
218 block.Set(node.Order, signature)
220 return signature, nil
223 func (c *Chain) updateBlockSignature(blockHeader *types.BlockHeader, nodeOrder uint64, signature []byte) error {
224 blockHeader.Set(nodeOrder, signature)
225 if err := c.store.SaveBlockHeader(blockHeader); err != nil {
229 if c.isIrreversible(blockHeader) && blockHeader.Height > c.bestIrrBlockHeader.Height {
230 if err := c.store.SaveChainStatus(c.bestBlockHeader, blockHeader, []*types.BlockHeader{}, state.NewUtxoViewpoint(), []*state.VoteResult{}); err != nil {
233 c.bestIrrBlockHeader = blockHeader