import (
"encoding/hex"
- "time"
-
- "github.com/vapor/crypto/ed25519"
- "github.com/vapor/crypto/ed25519/chainkd"
- "github.com/vapor/errors"
- "github.com/vapor/math/checked"
- "github.com/vapor/protocol/bc/types"
- "github.com/vapor/protocol/state"
-)
+ "fmt"
-var (
- errVotingOperationOverFlow = errors.New("voting operation result overflow")
+ log "github.com/sirupsen/logrus"
+
+ "github.com/bytom/vapor/config"
+ "github.com/bytom/vapor/crypto/ed25519/chainkd"
+ "github.com/bytom/vapor/errors"
+ "github.com/bytom/vapor/event"
+ "github.com/bytom/vapor/protocol/bc"
+ "github.com/bytom/vapor/protocol/bc/types"
+ "github.com/bytom/vapor/protocol/state"
)
-type bbft struct {
- consensusNodeManager *consensusNodeManager
-}
+const (
+ maxSignatureCacheSize = 10000
+)
-func newBbft(store Store, blockIndex *state.BlockIndex) *bbft {
- return &bbft{
- consensusNodeManager: newConsensusNodeManager(store, blockIndex),
- }
-}
+var (
+ errDoubleSignBlock = errors.New("the consensus is double sign in same height of different block")
+ errInvalidSignature = errors.New("the signature of block is invalid")
+ errSignForkChain = errors.New("can not sign fork before the irreversible block")
+)
-// IsConsensusPubkey determine whether a public key is a consensus node at a specified height
-func (b *bbft) IsConsensusPubkey(height uint64, pubkey []byte) (bool, error) {
- node, err := b.consensusNodeManager.getConsensusNode(height, hex.EncodeToString(pubkey))
- if err != nil && err != errNotFoundConsensusNode {
- return false, err
- }
- return node != nil, nil
+func signCacheKey(blockHash, pubkey string) string {
+ return fmt.Sprintf("%s:%s", blockHash, pubkey)
}
-func (b *bbft) isIrreversible(block *types.Block) bool {
- signNum, err := b.validateSign(block)
+func (c *Chain) checkDoubleSign(bh *types.BlockHeader, xPub string) error {
+ blockHashes, err := c.store.GetBlockHashesByHeight(bh.Height)
if err != nil {
- return false
+ return err
}
- return signNum > (numOfConsensusNode * 2 / 3)
-}
-
-// NextLeaderTime returns the start time of the specified public key as the next leader node
-func (b *bbft) NextLeaderTime(pubkey []byte, bestBlockTimestamp, bestBlockHeight uint64) (*time.Time, error) {
- return b.consensusNodeManager.nextLeaderTime(pubkey, bestBlockTimestamp, bestBlockHeight)
-}
+ for _, blockHash := range blockHashes {
+ if *blockHash == bh.Hash() {
+ continue
+ }
-func (b *bbft) ApplyBlock(voteResultMap map[uint64]*state.VoteResult, block *types.Block) (err error) {
- voteSeq := block.Height / roundVoteBlockNums
- voteResult := voteResultMap[voteSeq]
+ blockHeader, err := c.store.GetBlockHeader(blockHash)
+ if err != nil {
+ return err
+ }
- if voteResult == nil {
- store := b.consensusNodeManager.store
- voteResult, err = store.GetVoteResult(voteSeq)
- if err != nil && err != ErrNotFoundVoteResult {
+ consensusNode, err := c.getConsensusNode(&blockHeader.PreviousBlockHash, xPub)
+ if err == errNotFoundConsensusNode {
+ continue
+ } else if err != nil {
return err
}
- }
- if voteResult == nil {
- voteResult = &state.VoteResult{
- Seq: voteSeq,
- NumOfVote: make(map[string]uint64),
- LastBlockHeight: block.Height,
+ if blockHeader.BlockWitness.Get(consensusNode.Order) != nil {
+ return errDoubleSignBlock
}
}
+ return nil
+}
- voteResultMap[voteSeq] = voteResult
-
- if voteResult.LastBlockHeight+1 != block.Height {
- return errors.New("bbft append block error, the block height is not equals last block height plus 1 of vote result")
+func (c *Chain) checkNodeSign(bh *types.BlockHeader, consensusNode *state.ConsensusNode, signature []byte) error {
+ if !consensusNode.XPub.Verify(bh.Hash().Bytes(), signature) {
+ return errInvalidSignature
}
- for _, tx := range block.Transactions {
- for _, input := range tx.Inputs {
- unVoteInput, ok := input.TypedInput.(*types.UnvoteInput)
- if !ok {
- continue
- }
-
- pubkey := hex.EncodeToString(unVoteInput.Vote)
- voteResult.NumOfVote[pubkey], ok = checked.SubUint64(voteResult.NumOfVote[pubkey], unVoteInput.Amount)
- if !ok {
- return errVotingOperationOverFlow
- }
- }
- for _, output := range tx.Outputs {
- voteOutput, ok := output.TypedOutput.(*types.VoteTxOutput)
- if !ok {
- continue
- }
+ return c.checkDoubleSign(bh, consensusNode.XPub.String())
+}
- pubkey := hex.EncodeToString(voteOutput.Vote)
- voteResult.NumOfVote[pubkey], ok = checked.AddUint64(voteResult.NumOfVote[pubkey], voteOutput.Amount)
- if !ok {
- return errVotingOperationOverFlow
- }
+func (c *Chain) isIrreversible(blockHeader *types.BlockHeader) bool {
+ consensusNodes, err := c.getConsensusNodes(&blockHeader.PreviousBlockHash)
+ if err != nil {
+ return false
+ }
+
+ signCount := 0
+ for i := 0; i < len(consensusNodes); i++ {
+ if blockHeader.BlockWitness.Get(uint64(i)) != nil {
+ signCount++
}
}
- voteResult.LastBlockHeight++
- voteResult.Finalized = (block.Height+1)%roundVoteBlockNums == 0
- return nil
+ return signCount > len(consensusNodes)*2/3
}
-func (b *bbft) DetachBlock(voteResultMap map[uint64]*state.VoteResult, block *types.Block) error {
- voteSeq := block.Height / roundVoteBlockNums
- voteResult := voteResultMap[voteSeq]
-
- if voteResult == nil {
- store := b.consensusNodeManager.store
- voteResult, err := store.GetVoteResult(voteSeq)
- if err != nil {
- return err
- }
- voteResultMap[voteSeq] = voteResult
+func (c *Chain) updateBlockSignature(blockHeader *types.BlockHeader, nodeOrder uint64, signature []byte) error {
+ blockHeader.Set(nodeOrder, signature)
+ if err := c.store.SaveBlockHeader(blockHeader); err != nil {
+ return err
}
- if voteResult.LastBlockHeight != block.Height {
- return errors.New("bbft detach block error, the block height is not equals last block height of vote result")
+ if !c.isIrreversible(blockHeader) || blockHeader.Height <= c.lastIrrBlockHeader.Height {
+ return nil
}
- for _, tx := range block.Transactions {
- for _, input := range tx.Inputs {
- unVoteInput, ok := input.TypedInput.(*types.UnvoteInput)
- if !ok {
- continue
- }
-
- pubkey := hex.EncodeToString(unVoteInput.Vote)
- voteResult.NumOfVote[pubkey], ok = checked.AddUint64(voteResult.NumOfVote[pubkey], unVoteInput.Amount)
- if !ok {
- return errVotingOperationOverFlow
- }
+ if c.InMainChain(blockHeader.Hash()) {
+ if err := c.store.SaveChainStatus(c.bestBlockHeader, blockHeader, []*types.BlockHeader{}, state.NewUtxoViewpoint(), []*state.ConsensusResult{}); err != nil {
+ return err
}
- for _, output := range tx.Outputs {
- voteOutput, ok := output.TypedOutput.(*types.VoteTxOutput)
- if !ok {
- continue
- }
-
- pubkey := hex.EncodeToString(voteOutput.Vote)
- voteResult.NumOfVote[pubkey], ok = checked.SubUint64(voteResult.NumOfVote[pubkey], voteOutput.Amount)
- if !ok {
- return errVotingOperationOverFlow
- }
+
+ c.lastIrrBlockHeader = blockHeader
+ } else {
+ // block is on a forked chain
+ log.WithFields(log.Fields{"module": logModule}).Info("majority votes received on forked chain")
+ tail, err := c.traceLongestChainTail(blockHeader)
+ if err != nil {
+ return err
}
- }
- voteResult.LastBlockHeight--
- voteResult.Finalized = false
+ return c.reorganizeChain(tail)
+ }
return nil
}
-// ValidateBlock verify whether the block is valid
-func (b *bbft) ValidateBlock(block *types.Block) error {
- signNum, err := b.validateSign(block)
+// validateSign verify the signatures of block, and return the number of correct signature
+// if some signature is invalid, they will be reset to nil
+// if the block does not have the signature of blocker, it will return error
+func (c *Chain) validateSign(block *types.Block) error {
+ consensusNodeMap, err := c.getConsensusNodes(&block.PreviousBlockHash)
if err != nil {
return err
}
- if signNum == 0 {
- return errors.New("no valid signature")
- }
- return nil
-}
-
-// validateSign verify the signatures of block, and return the number of correct signature
-// if some signature is invalid, they will be reset to nil
-// if the block has not the signature of blocker, it will return error
-func (b *bbft) validateSign(block *types.Block) (uint64, error) {
- var correctSignNum uint64
- consensusNodeMap, err := b.consensusNodeManager.getConsensusNodesByVoteResult(block.Height)
+ blocker, err := c.GetBlocker(&block.PreviousBlockHash, block.Timestamp)
if err != nil {
- return 0, err
+ return err
}
hasBlockerSign := false
- for pubkey, node := range consensusNodeMap {
- if len(block.Witness) <= int(node.order) {
- continue
- }
-
- blocks := b.consensusNodeManager.blockIndex.NodesByHeight(block.Height)
- for _, b := range blocks {
- if b.Hash == block.Hash() {
+ blockHash := block.Hash()
+ for pubKey, node := range consensusNodeMap {
+ if block.BlockWitness.Get(node.Order) == nil {
+ cachekey := signCacheKey(blockHash.String(), pubKey)
+ if signature, ok := c.signatureCache.Get(cachekey); ok {
+ block.Set(node.Order, signature.([]byte))
+ c.eventDispatcher.Post(event.BlockSignatureEvent{BlockHash: blockHash, Signature: signature.([]byte), XPub: node.XPub[:]})
+ c.signatureCache.Remove(cachekey)
+ } else {
continue
}
- if ok, err := b.BlockWitness.Test(uint32(node.order)); err != nil && ok {
- // Consensus node is signed twice with the same block height, discard the signature
- block.Witness[node.order] = nil
- break
- }
}
- if ed25519.Verify(ed25519.PublicKey(pubkey), block.Hash().Bytes(), block.Witness[node.order]) {
- correctSignNum++
- isBlocker, err := b.consensusNodeManager.isBlocker(block.Height, block.Timestamp, pubkey)
- if err != nil {
- return 0, err
- }
- if isBlocker {
- hasBlockerSign = true
- }
- } else {
- // discard the invalid signature
- block.Witness[node.order] = nil
+ if err := c.checkNodeSign(&block.BlockHeader, node, block.Get(node.Order)); err == errDoubleSignBlock {
+ log.WithFields(log.Fields{"module": logModule, "blockHash": blockHash.String(), "pubKey": pubKey}).Warn("the consensus node double sign the same height of different block")
+ block.BlockWitness.Delete(node.Order)
+ continue
+ } else if err != nil {
+ return err
+ }
+
+ if blocker == pubKey {
+ hasBlockerSign = true
}
}
+
if !hasBlockerSign {
- return 0, errors.New("the block has no signature of the blocker")
+ return errors.New("the block has no signature of the blocker")
}
- return correctSignNum, nil
+ return nil
}
-// SignBlock signing the block if current node is consensus node
-func (b *bbft) SignBlock(block *types.Block) error {
- var xprv chainkd.XPrv
- xpub := [64]byte(xprv.XPub())
- node, err := b.consensusNodeManager.getConsensusNode(block.Height, hex.EncodeToString(xpub[:]))
- if err != nil && err != errNotFoundConsensusNode {
+// ProcessBlockSignature process the received block signature messages
+// return whether a block become irreversible, if so, the chain module must update status
+func (c *Chain) ProcessBlockSignature(signature, xPub []byte, blockHash *bc.Hash) error {
+ xpubStr := hex.EncodeToString(xPub[:])
+ blockHeader, _ := c.store.GetBlockHeader(blockHash)
+
+ // save the signature if the block is not exist
+ if blockHeader == nil {
+ var xPubKey chainkd.XPub
+ copy(xPubKey[:], xPub[:])
+ if !xPubKey.Verify(blockHash.Bytes(), signature) {
+ return errInvalidSignature
+ }
+
+ cacheKey := signCacheKey(blockHash.String(), xpubStr)
+ c.signatureCache.Add(cacheKey, signature)
+ return nil
+ }
+
+ consensusNode, err := c.getConsensusNode(&blockHeader.PreviousBlockHash, xpubStr)
+ if err != nil {
return err
}
- if node == nil {
+ if blockHeader.BlockWitness.Get(consensusNode.Order) != nil {
return nil
}
- block.Witness[node.order] = xprv.Sign(block.Hash().Bytes())
- return nil
+ c.cond.L.Lock()
+ defer c.cond.L.Unlock()
+ if err := c.checkNodeSign(blockHeader, consensusNode, signature); err != nil {
+ return err
+ }
+
+ if err := c.updateBlockSignature(blockHeader, consensusNode.Order, signature); err != nil {
+ return err
+ }
+ return c.eventDispatcher.Post(event.BlockSignatureEvent{BlockHash: *blockHash, Signature: signature, XPub: xPub})
}
-// UpdateConsensusNodes used to update consensus node after each round of voting
-func (b *bbft) UpdateConsensusNodes(blockHeight uint64) error {
- return b.consensusNodeManager.updateConsensusNodes(blockHeight)
+// SignBlock signing the block if current node is consensus node
+func (c *Chain) SignBlock(block *types.Block) ([]byte, error) {
+ xprv := config.CommonConfig.PrivateKey()
+ xpubStr := xprv.XPub().String()
+ node, err := c.getConsensusNode(&block.PreviousBlockHash, xpubStr)
+ if err == errNotFoundConsensusNode {
+ return nil, nil
+ } else if err != nil {
+ return nil, err
+ }
+
+ if err := c.checkDoubleSign(&block.BlockHeader, node.XPub.String()); err == errDoubleSignBlock {
+ return nil, nil
+ } else if err != nil {
+ return nil, err
+ }
+
+ signature := block.Get(node.Order)
+ if len(signature) == 0 {
+ signature = xprv.Sign(block.Hash().Bytes())
+ block.Set(node.Order, signature)
+ }
+ return signature, nil
}
OSDN Git Service
