import (
"encoding/hex"
- "time"
+ "fmt"
- "github.com/vapor/crypto/ed25519"
- "github.com/vapor/crypto/ed25519/chainkd"
+ log "github.com/sirupsen/logrus"
+
+ "github.com/vapor/config"
"github.com/vapor/errors"
- "github.com/vapor/math/checked"
+ "github.com/vapor/event"
+ "github.com/vapor/protocol/bc"
"github.com/vapor/protocol/bc/types"
"github.com/vapor/protocol/state"
)
+const (
+ maxSignatureCacheSize = 10000
+)
+
var (
errVotingOperationOverFlow = errors.New("voting operation result overflow")
+ 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")
)
-type bbft struct {
- consensusNodeManager *consensusNodeManager
+func signCacheKey(blockHash, pubkey string) string {
+ return fmt.Sprintf("%s:%s", blockHash, pubkey)
}
-func newBbft(store Store, blockIndex *state.BlockIndex) *bbft {
- return &bbft{
- consensusNodeManager: newConsensusNodeManager(store, blockIndex),
+func (c *Chain) isIrreversible(blockNode *state.BlockNode) bool {
+ consensusNodes, err := c.consensusNodeManager.getConsensusNodes(&blockNode.Parent.Hash)
+ if err != nil {
+ return false
}
-}
-// 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
+ signCount := 0
+ for i := 0; i < len(consensusNodes); i++ {
+ if ok, _ := blockNode.BlockWitness.Test(uint32(i)); ok {
+ signCount++
+ }
}
- return node != nil, nil
+
+ return signCount > len(consensusNodes)*2/3
+}
+
+// GetVoteResultByHash return vote result by block hash
+func (c *Chain) GetVoteResultByHash(blockHash *bc.Hash) (*state.VoteResult, error) {
+ blockNode := c.index.GetNode(blockHash)
+ return c.consensusNodeManager.getVoteResult(state.CalcVoteSeq(blockNode.Height), blockNode)
}
-func (b *bbft) isIrreversible(block *types.Block) bool {
- signNum, err := b.validateSign(block)
+// IsBlocker returns whether the consensus node is a blocker at the specified time
+func (c *Chain) IsBlocker(prevBlockHash *bc.Hash, pubKey string, timeStamp uint64) (bool, error) {
+ xPub, err := c.consensusNodeManager.getBlocker(prevBlockHash, timeStamp)
if err != nil {
- return false
+ return false, err
}
-
- return signNum > (numOfConsensusNode * 2 / 3)
+ return xPub == pubKey, nil
}
-// 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)
+// GetBlock return blocker by specified timestamp
+func (c *Chain) GetBlocker(prevBlockHash *bc.Hash, timestamp uint64) (string, error) {
+ return c.consensusNodeManager.getBlocker(prevBlockHash, timestamp)
}
-func (b *bbft) ApplyBlock(voteResultMap map[uint64]*state.VoteResult, block *types.Block) (err error) {
- voteSeq := block.Height / roundVoteBlockNums
- voteResult := voteResultMap[voteSeq]
+// 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[:])
+ blockNode := c.index.GetNode(blockHash)
+ // save the signature if the block is not exist
+ if blockNode == nil {
+ cacheKey := signCacheKey(blockHash.String(), xpubStr)
+ c.signatureCache.Add(cacheKey, signature)
+ return nil
+ }
- if voteResult == nil {
- store := b.consensusNodeManager.store
- voteResult, err = store.GetVoteResult(voteSeq)
- if err != nil && err != ErrNotFoundVoteResult {
- return err
- }
+ consensusNode, err := c.consensusNodeManager.getConsensusNode(&blockNode.Parent.Hash, xpubStr)
+ if err != nil {
+ return err
}
- if voteResult == nil {
- voteResult = &state.VoteResult{
- Seq: voteSeq,
- NumOfVote: make(map[string]uint64),
- LastBlockHeight: block.Height,
- }
+ if exist, _ := blockNode.BlockWitness.Test(uint32(consensusNode.Order)); exist {
+ return nil
+ }
+
+ c.cond.L.Lock()
+ defer c.cond.L.Unlock()
+ if err := c.checkNodeSign(blockNode.BlockHeader(), consensusNode, signature); err != nil {
+ return err
}
- voteResultMap[voteSeq] = voteResult
+ if err := c.updateBlockSignature(blockNode, consensusNode.Order, signature); err != nil {
+ return err
+ }
+ return c.eventDispatcher.Post(event.BlockSignatureEvent{BlockHash: *blockHash, Signature: signature, XPub: xPub})
+}
- 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")
+// 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 (c *Chain) validateSign(block *types.Block) error {
+ consensusNodeMap, err := c.consensusNodeManager.getConsensusNodes(&block.PreviousBlockHash)
+ if err != nil {
+ return err
}
- 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
- }
+ hasBlockerSign := false
+ blockHash := block.Hash()
+ for pubKey, node := range consensusNodeMap {
+ if len(block.Witness) <= int(node.Order) {
+ continue
}
- for _, output := range tx.Outputs {
- voteOutput, ok := output.TypedOutput.(*types.VoteTxOutput)
- if !ok {
- continue
- }
- pubkey := hex.EncodeToString(voteOutput.Vote)
- voteResult.NumOfVote[pubkey], ok = checked.AddUint64(voteResult.NumOfVote[pubkey], voteOutput.Amount)
- if !ok {
- return errVotingOperationOverFlow
+ if block.Get(node.Order) == nil {
+ cachekey := signCacheKey(blockHash.String(), pubKey)
+ if signature, ok := c.signatureCache.Get(cachekey); ok {
+ block.Set(node.Order, signature.([]byte))
+ } else {
+ continue
}
}
- }
- voteResult.LastBlockHeight++
- voteResult.Finalized = (block.Height+1)%roundVoteBlockNums == 0
- return nil
-}
-
-func (b *bbft) DetachBlock(voteResultMap map[uint64]*state.VoteResult, block *types.Block) error {
- voteSeq := block.Height / roundVoteBlockNums
- voteResult := voteResultMap[voteSeq]
+ 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.Delete(node.Order)
+ continue
+ } else if err != nil {
+ return err
+ }
- if voteResult == nil {
- store := b.consensusNodeManager.store
- voteResult, err := store.GetVoteResult(voteSeq)
+ isBlocker, err := c.IsBlocker(&block.PreviousBlockHash, pubKey, block.Timestamp)
if err != nil {
return err
}
- voteResultMap[voteSeq] = voteResult
- }
- if voteResult.LastBlockHeight != block.Height {
- return errors.New("bbft detach block error, the block height is not equals last block height of vote result")
- }
-
- 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 isBlocker {
+ hasBlockerSign = true
}
- 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
- }
- }
- }
- voteResult.LastBlockHeight--
- voteResult.Finalized = false
- return nil
-}
-
-// ValidateBlock verify whether the block is valid
-func (b *bbft) ValidateBlock(block *types.Block) error {
- signNum, err := b.validateSign(block)
- if err != nil {
- return err
}
- if signNum == 0 {
- return errors.New("no valid signature")
+ if !hasBlockerSign {
+ return errors.New("the block has no signature of the blocker")
}
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)
- if err != nil {
- return 0, err
+func (c *Chain) checkNodeSign(bh *types.BlockHeader, consensusNode *state.ConsensusNode, signature []byte) error {
+ if !consensusNode.XPub.Verify(bh.Hash().Bytes(), signature) {
+ return errInvalidSignature
}
- hasBlockerSign := false
- for pubkey, node := range consensusNodeMap {
- if len(block.Witness) <= int(node.order) {
+ blockNodes := c.consensusNodeManager.blockIndex.NodesByHeight(bh.Height)
+ for _, blockNode := range blockNodes {
+ if blockNode.Hash == bh.Hash() {
continue
}
- blocks := b.consensusNodeManager.blockIndex.NodesByHeight(block.Height)
- for _, b := range blocks {
- if b.Hash == block.Hash() {
- 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
- }
+ consensusNode, err := c.consensusNodeManager.getConsensusNode(&blockNode.Parent.Hash, consensusNode.XPub.String())
+ if err != nil && err != errNotFoundConsensusNode {
+ return err
}
- 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 == errNotFoundConsensusNode {
+ continue
+ }
+
+ if ok, err := blockNode.BlockWitness.Test(uint32(consensusNode.Order)); err == nil && ok {
+ return errDoubleSignBlock
}
}
- if !hasBlockerSign {
- return 0, 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 {
- return err
+func (c *Chain) SignBlock(block *types.Block) ([]byte, error) {
+ xprv := config.CommonConfig.PrivateKey()
+ xpubStr := xprv.XPub().String()
+ node, err := c.consensusNodeManager.getConsensusNode(&block.PreviousBlockHash, xpubStr)
+ if err == errNotFoundConsensusNode {
+ return nil, nil
+ } else if err != nil {
+ return nil, err
+ }
+
+ c.cond.L.Lock()
+ defer c.cond.L.Unlock()
+ //check double sign in same block height
+ blockNodes := c.consensusNodeManager.blockIndex.NodesByHeight(block.Height)
+ for _, blockNode := range blockNodes {
+ // Has already signed the same height block
+ if ok, err := blockNode.BlockWitness.Test(uint32(node.Order)); err == nil && ok {
+ return nil, nil
+ }
}
- if node == nil {
- return nil
+ for blockNode := c.index.GetNode(&block.PreviousBlockHash); !c.index.InMainchain(blockNode.Hash); blockNode = blockNode.Parent {
+ if blockNode.Height <= c.bestIrreversibleNode.Height {
+ return nil, errSignForkChain
+ }
}
- block.Witness[node.order] = xprv.Sign(block.Hash().Bytes())
- return nil
+ signature := block.Get(node.Order)
+ if len(signature) == 0 {
+ signature = xprv.Sign(block.Hash().Bytes())
+ block.Set(node.Order, signature)
+ }
+ return signature, nil
}
-// UpdateConsensusNodes used to update consensus node after each round of voting
-func (b *bbft) UpdateConsensusNodes(blockHeight uint64) error {
- return b.consensusNodeManager.updateConsensusNodes(blockHeight)
+func (c *Chain) updateBlockSignature(blockNode *state.BlockNode, nodeOrder uint64, signature []byte) error {
+ if err := blockNode.BlockWitness.Set(uint32(nodeOrder)); err != nil {
+ return err
+ }
+
+ blockHeader, err := c.store.GetBlockHeader(&blockNode.Hash, blockNode.Height)
+ if err != nil {
+ return err
+ }
+
+ blockHeader.Set(nodeOrder, signature)
+
+ if err := c.store.SaveBlockHeader(blockHeader); err != nil {
+ return err
+ }
+
+ if c.isIrreversible(blockNode) && blockNode.Height > c.bestIrreversibleNode.Height {
+ if err := c.store.SaveChainStatus(c.bestNode, blockNode, state.NewUtxoViewpoint(), []*state.VoteResult{}); err != nil {
+ return err
+ }
+
+ c.bestIrreversibleNode = blockNode
+ }
+ return nil
}