7 log "github.com/sirupsen/logrus"
9 "github.com/vapor/config"
10 "github.com/vapor/crypto/ed25519/chainkd"
11 "github.com/vapor/errors"
12 "github.com/vapor/event"
13 "github.com/vapor/protocol/bc"
14 "github.com/vapor/protocol/bc/types"
15 "github.com/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 block.BlockWitness.Delete(node.Order)
147 } else if err != nil {
151 if blocker == pubKey {
152 hasBlockerSign = true
157 return errors.New("the block has no signature of the blocker")
162 // ProcessBlockSignature process the received block signature messages
163 // return whether a block become irreversible, if so, the chain module must update status
164 func (c *Chain) ProcessBlockSignature(signature, xPub []byte, blockHash *bc.Hash) error {
165 xpubStr := hex.EncodeToString(xPub[:])
166 blockHeader, _ := c.store.GetBlockHeader(blockHash)
168 // save the signature if the block is not exist
169 if blockHeader == nil {
170 var xPubKey chainkd.XPub
171 copy(xPubKey[:], xPub[:])
172 if !xPubKey.Verify(blockHash.Bytes(), signature) {
173 return errInvalidSignature
176 cacheKey := signCacheKey(blockHash.String(), xpubStr)
177 c.signatureCache.Add(cacheKey, signature)
181 consensusNode, err := c.getConsensusNode(&blockHeader.PreviousBlockHash, xpubStr)
186 if blockHeader.BlockWitness.Get(consensusNode.Order) != nil {
191 defer c.cond.L.Unlock()
192 if err := c.checkNodeSign(blockHeader, consensusNode, signature); err != nil {
196 if err := c.updateBlockSignature(blockHeader, consensusNode.Order, signature); err != nil {
199 return c.eventDispatcher.Post(event.BlockSignatureEvent{BlockHash: *blockHash, Signature: signature, XPub: xPub})
202 // SignBlock signing the block if current node is consensus node
203 func (c *Chain) SignBlock(block *types.Block) ([]byte, error) {
204 xprv := config.CommonConfig.PrivateKey()
205 xpubStr := xprv.XPub().String()
206 node, err := c.getConsensusNode(&block.PreviousBlockHash, xpubStr)
207 if err == errNotFoundConsensusNode {
209 } else if err != nil {
213 if err := c.checkDoubleSign(&block.BlockHeader, node.XPub.String()); err == errDoubleSignBlock {
215 } else if err != nil {
219 signature := block.Get(node.Order)
220 if len(signature) == 0 {
221 signature = xprv.Sign(block.Hash().Bytes())
222 block.Set(node.Order, signature)
224 return signature, nil