package protocol
import (
- "encoding/hex"
- "sort"
- "time"
-
+ "github.com/vapor/consensus"
"github.com/vapor/errors"
- "github.com/vapor/math/checked"
"github.com/vapor/protocol/bc"
"github.com/vapor/protocol/bc/types"
"github.com/vapor/protocol/state"
)
-const (
- numOfConsensusNode = 21
- roundVoteBlockNums = 1000
-
- // BlockTimeInterval indicate product one block per 500 milliseconds
- BlockTimeInterval = 500
- // BlockNumEachNode indicate product three blocks per node in succession
- BlockNumEachNode = 3
-)
-
var (
- errHasNoChanceProductBlock = errors.New("the node has no chance to product a block in this round of voting")
- errNotFoundConsensusNode = errors.New("can not found consensus node")
- errNotFoundBlockNode = errors.New("can not find block node")
+ errNotFoundConsensusNode = errors.New("can not found consensus node")
+ errNotFoundBlockNode = errors.New("can not find block node")
)
-type consensusNode struct {
- pubkey string
- voteNum uint64
- order uint64
-}
-
-type consensusNodeSlice []*consensusNode
-
-func (c consensusNodeSlice) Len() int { return len(c) }
-func (c consensusNodeSlice) Less(i, j int) bool { return c[i].voteNum > c[j].voteNum }
-func (c consensusNodeSlice) Swap(i, j int) { c[i], c[j] = c[j], c[i] }
-
-type consensusNodeManager struct {
- store Store
- blockIndex *state.BlockIndex
-}
-
-func newConsensusNodeManager(store Store, blockIndex *state.BlockIndex) *consensusNodeManager {
- return &consensusNodeManager{
- store: store,
- blockIndex: blockIndex,
- }
-}
-
-func (c *consensusNodeManager) getConsensusNode(blockHash *bc.Hash, pubkey string) (*consensusNode, error) {
- consensusNodeMap, err := c.getConsensusNodesByVoteResult(blockHash)
+func (c *Chain) getConsensusNode(prevBlockHash *bc.Hash, pubkey string) (*state.ConsensusNode, error) {
+ consensusNodeMap, err := c.getConsensusNodes(prevBlockHash)
if err != nil {
return nil, err
}
return node, nil
}
-func (c *consensusNodeManager) isBlocker(blockHash *bc.Hash, pubkey string) (bool, error) {
- blockNode := c.blockIndex.GetNode(blockHash)
- if blockNode == nil {
- return false, errNotFoundBlockNode
- }
-
- consensusNode, err := c.getConsensusNode(blockHash, pubkey)
- if err != nil && err != errNotFoundConsensusNode {
- return false, err
- }
-
- if consensusNode == nil {
- return false, nil
- }
-
- prevVoteRoundLastBlock, err := c.getPrevRoundVoteLastBlock(blockNode)
+// GetBlocker return blocker by specified timestamp
+func (c *Chain) GetBlocker(prevBlockHash *bc.Hash, timeStamp uint64) (string, error) {
+ consensusNodeMap, err := c.getConsensusNodes(prevBlockHash)
if err != nil {
- return false, err
- }
-
- startTimestamp := prevVoteRoundLastBlock.Timestamp + BlockTimeInterval
-
- begin := getLastBlockTimeInTimeRange(startTimestamp, blockNode.Timestamp, consensusNode.order)
- end := begin + BlockNumEachNode*BlockTimeInterval
- return blockNode.Timestamp >= begin && blockNode.Timestamp < end, nil
-}
-
-func (c *consensusNodeManager) nextLeaderTimeRange(pubkey []byte, bestBlockHash *bc.Hash) (uint64, uint64, error) {
- bestBlockNode := c.blockIndex.GetNode(bestBlockHash)
- if bestBlockNode == nil {
- return 0, 0, errNotFoundBlockNode
+ return "", err
}
- consensusNode, err := c.getConsensusNode(bestBlockHash, hex.EncodeToString(pubkey))
+ prevVoteRoundLastBlock, err := c.getPrevRoundLastBlock(prevBlockHash)
if err != nil {
- return 0, 0, err
+ return "", err
}
- prevRoundLastBlock, err := c.getPrevRoundVoteLastBlock(bestBlockNode)
- if err != nil {
- return 0, 0, nil
- }
-
- startTime := prevRoundLastBlock.Timestamp + BlockTimeInterval
- endTime := startTime + roundVoteBlockNums*BlockTimeInterval
-
- nextLeaderTime, err := nextLeaderTimeHelper(startTime, endTime, uint64(time.Now().UnixNano()/1e6), consensusNode.order)
- if err != nil {
- return 0, 0, err
- }
-
- return nextLeaderTime, nextLeaderTime + BlockNumEachNode*BlockTimeInterval, nil
-}
-
-func nextLeaderTimeHelper(startTime, endTime, now, nodeOrder uint64) (uint64, error) {
- nextLeaderTimestamp := getLastBlockTimeInTimeRange(startTime, now, nodeOrder)
- roundBlockTime := uint64(BlockNumEachNode * numOfConsensusNode * BlockTimeInterval)
-
- if int64(now-nextLeaderTimestamp) >= BlockNumEachNode*BlockTimeInterval {
- nextLeaderTimestamp += roundBlockTime
- if nextLeaderTimestamp >= endTime {
- return 0, errHasNoChanceProductBlock
+ startTimestamp := prevVoteRoundLastBlock.Timestamp + consensus.BlockTimeInterval
+ order := getBlockerOrder(startTimestamp, timeStamp, uint64(len(consensusNodeMap)))
+ for xPub, consensusNode := range consensusNodeMap {
+ if consensusNode.Order == order {
+ return xPub, nil
}
}
- return nextLeaderTimestamp, nil
+ // impossible occur
+ return "", errors.New("can not find blocker by given timestamp")
}
-func getLastBlockTimeInTimeRange(startTimestamp, endTimestamp, order uint64) uint64 {
+func getBlockerOrder(startTimestamp, blockTimestamp, numOfConsensusNode uint64) uint64 {
// One round of product block time for all consensus nodes
- roundBlockTime := uint64(BlockNumEachNode * numOfConsensusNode * BlockTimeInterval)
+ roundBlockTime := consensus.BlockNumEachNode * numOfConsensusNode * consensus.BlockTimeInterval
// The start time of the last round of product block
- lastRoundStartTime := startTimestamp + (endTimestamp-startTimestamp)/roundBlockTime*roundBlockTime
- // The time of product block of the consensus in last round
- return lastRoundStartTime + order*(BlockNumEachNode*BlockTimeInterval)
+ lastRoundStartTime := startTimestamp + (blockTimestamp-startTimestamp)/roundBlockTime*roundBlockTime
+ // Order of blocker
+ return (blockTimestamp - lastRoundStartTime) / (consensus.BlockNumEachNode * consensus.BlockTimeInterval)
}
-func (c *consensusNodeManager) getPrevRoundVoteLastBlock(blockNode *state.BlockNode) (*state.BlockNode, error) {
- prevVoteRoundLastBlockHeight := blockNode.Height/roundVoteBlockNums*roundVoteBlockNums - 1
- lastBlockNode := blockNode.GetParent(prevVoteRoundLastBlockHeight)
- if lastBlockNode == nil {
+func (c *Chain) getPrevRoundLastBlock(prevBlockHash *bc.Hash) (*types.BlockHeader, error) {
+ blockHeader, err := c.store.GetBlockHeader(prevBlockHash)
+ if err != nil {
return nil, errNotFoundBlockNode
}
- return lastBlockNode, nil
+
+ for blockHeader.Height%consensus.RoundVoteBlockNums != 0 {
+ blockHeader, err = c.store.GetBlockHeader(&blockHeader.PreviousBlockHash)
+ if err != nil {
+ return nil, err
+ }
+ }
+ return blockHeader, nil
}
-func (c *consensusNodeManager) getConsensusNodesByVoteResult(blockHash *bc.Hash) (map[string]*consensusNode, error) {
- blockNode := c.blockIndex.GetNode(blockHash)
- if blockNode == nil {
+func (c *Chain) getConsensusNodes(prevBlockHash *bc.Hash) (map[string]*state.ConsensusNode, error) {
+ prevBlockHeader, err := c.store.GetBlockHeader(prevBlockHash)
+ if err != nil {
return nil, errNotFoundBlockNode
}
- seq := blockNode.Height / roundVoteBlockNums
- voteResult, err := c.store.GetVoteResult(seq)
- if err != nil {
- // fail to find vote result, try to construct
- voteResult = &state.VoteResult{
- Seq: seq,
- NumOfVote: make(map[string]uint64),
- Finalized: false,
- }
+ bestBlockHeader := c.bestBlockHeader
+ preSeq := state.CalcVoteSeq(prevBlockHeader.Height+1) - 1
+ if bestSeq := state.CalcVoteSeq(bestBlockHeader.Height); preSeq > bestSeq {
+ preSeq = bestSeq
}
- lastBlockNode, err := c.getPrevRoundVoteLastBlock(blockNode)
+ lastBlockHeader, err := c.getPrevRoundLastBlock(prevBlockHash)
if err != nil {
return nil, err
}
- if err := c.reorganizeVoteResult(voteResult, lastBlockNode); err != nil {
+ voteResult, err := c.getVoteResult(preSeq, lastBlockHeader)
+ if err != nil {
return nil, err
}
- var nodes []*consensusNode
- for pubkey, voteNum := range voteResult.NumOfVote {
- nodes = append(nodes, &consensusNode{
- pubkey: pubkey,
- voteNum: voteNum,
- })
- }
- // In principle, there is no need to sort all voting nodes.
- // if there is a performance problem, consider the optimization later.
- // TODO not consider the same number of votes
- sort.Sort(consensusNodeSlice(nodes))
+ return voteResult.ConsensusNodes()
+}
- result := make(map[string]*consensusNode)
- for i := 0; i < numOfConsensusNode; i++ {
- node := nodes[i]
- node.order = uint64(i)
- result[node.pubkey] = node
- }
- return result, nil
+func (c *Chain) getBestVoteResult() (*state.VoteResult, error) {
+ bestBlockHeader := c.bestBlockHeader
+ seq := state.CalcVoteSeq(bestBlockHeader.Height)
+ return c.getVoteResult(seq, bestBlockHeader)
}
-func (c *consensusNodeManager) reorganizeVoteResult(voteResult *state.VoteResult, forkChainNode *state.BlockNode) error {
- var mainChainNode *state.BlockNode
- emptyHash := bc.Hash{}
- if voteResult.LastBlockHash != emptyHash {
- mainChainNode = c.blockIndex.GetNode(&voteResult.LastBlockHash)
- if mainChainNode == nil {
- return errNotFoundBlockNode
- }
+// getVoteResult return the vote result
+// seq represent the sequence of vote
+// blockHeader represent the chain in which the result of the vote is located
+// Voting results need to be adjusted according to the chain
+func (c *Chain) getVoteResult(seq uint64, blockHeader *types.BlockHeader) (*state.VoteResult, error) {
+ voteResult, err := c.store.GetVoteResult(seq)
+ if err != nil {
+ return nil, err
}
- var attachNodes []*state.BlockNode
- var detachNodes []*state.BlockNode
+ if err := c.reorganizeVoteResult(voteResult, blockHeader); err != nil {
+ return nil, err
+ }
- for forkChainNode.Hash != mainChainNode.Hash && forkChainNode.Height >= (voteResult.Seq-1)*roundVoteBlockNums {
- attachNodes = append([]*state.BlockNode{forkChainNode}, attachNodes...)
- forkChainNode = forkChainNode.Parent
+ return voteResult, nil
+}
- if mainChainNode != nil && forkChainNode.Height == mainChainNode.Height {
- detachNodes = append(detachNodes, mainChainNode)
- mainChainNode = mainChainNode.Parent
- }
+func (c *Chain) reorganizeVoteResult(voteResult *state.VoteResult, blockHeader *types.BlockHeader) error {
+ mainChainBlockHeader, err := c.store.GetBlockHeader(&voteResult.BlockHash)
+ if err != nil {
+ return err
}
- for _, node := range detachNodes {
- block, err := c.store.GetBlock(&node.Hash)
- if err != nil {
- return err
- }
-
- if err := c.detachBlock(map[uint64]*state.VoteResult{voteResult.Seq: voteResult}, block); err != nil {
- return err
- }
+ attachBlockHeaders, detachBlockHeaders, err := c.calcReorganizeChain(blockHeader, mainChainBlockHeader)
+ if err != nil {
+ return err
}
- for _, node := range attachNodes {
- block, err := c.store.GetBlock(&node.Hash)
+ for _, bh := range detachBlockHeaders {
+ blockHash := bh.Hash()
+ block, err := c.store.GetBlock(&blockHash)
if err != nil {
return err
}
- if err := c.applyBlock(map[uint64]*state.VoteResult{voteResult.Seq: voteResult}, block); err != nil {
- return err
- }
- }
- return nil
-}
-
-func (c *consensusNodeManager) applyBlock(voteResultMap map[uint64]*state.VoteResult, block *types.Block) (err error) {
- voteSeq := block.Height / roundVoteBlockNums
- voteResult := voteResultMap[voteSeq]
-
- if voteResult == nil {
- voteResult, err = c.store.GetVoteResult(voteSeq)
- if err != nil && err != ErrNotFoundVoteResult {
+ if err := voteResult.DetachBlock(block); err != nil {
return err
}
}
- if voteResult == nil {
- voteResult = &state.VoteResult{
- Seq: voteSeq,
- NumOfVote: make(map[string]uint64),
- LastBlockHash: block.Hash(),
- }
- }
-
- voteResultMap[voteSeq] = voteResult
-
- if voteResult.LastBlockHash != block.PreviousBlockHash {
- return errors.New("bbft append block error, the block parent hash is not equals last block hash 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.SubUint64(voteResult.NumOfVote[pubkey], unVoteInput.Amount)
- if !ok {
- return errVotingOperationOverFlow
- }
- }
- 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
- }
- }
- }
-
- voteResult.Finalized = (block.Height+1)%roundVoteBlockNums == 0
- return nil
-}
-
-func (c *consensusNodeManager) detachBlock(voteResultMap map[uint64]*state.VoteResult, block *types.Block) error {
- voteSeq := block.Height / roundVoteBlockNums
- voteResult := voteResultMap[voteSeq]
-
- if voteResult == nil {
- voteResult, err := c.store.GetVoteResult(voteSeq)
+ for _, bh := range attachBlockHeaders {
+ blockHash := bh.Hash()
+ block, err := c.store.GetBlock(&blockHash)
if err != nil {
return err
}
- voteResultMap[voteSeq] = voteResult
- }
-
- if voteResult.LastBlockHash != block.Hash() {
- return errors.New("bbft detach block error, the block hash is not equals last block hash 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
- }
- }
- 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
- }
+ if err := voteResult.ApplyBlock(block); err != nil {
+ return err
}
}
-
- voteResult.Finalized = false
return nil
}
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