You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
344 lines
10 KiB
344 lines
10 KiB
package consensus
|
|
|
|
import (
|
|
"bytes"
|
|
"crypto/sha256"
|
|
"encoding/binary"
|
|
"encoding/gob"
|
|
"harmony-benchmark/blockchain"
|
|
"harmony-benchmark/p2p"
|
|
"runtime"
|
|
"strings"
|
|
"time"
|
|
)
|
|
|
|
var (
|
|
startTime time.Time
|
|
)
|
|
|
|
// WaitForNewBlock waits for a new block.
|
|
func (consensus *Consensus) WaitForNewBlock(blockChannel chan blockchain.Block) {
|
|
consensus.Log.Debug("Waiting for block", "consensus", consensus)
|
|
for { // keep waiting for new blocks
|
|
newBlock := <-blockChannel
|
|
// TODO: think about potential race condition
|
|
consensus.Log.Debug("STARTING CONSENSUS", "consensus", consensus)
|
|
for consensus.state == FINISHED {
|
|
time.Sleep(500 * time.Millisecond)
|
|
consensus.startConsensus(&newBlock)
|
|
break
|
|
}
|
|
}
|
|
}
|
|
|
|
// ProcessMessageLeader is the leader's consensus message dispatcher
|
|
func (consensus *Consensus) ProcessMessageLeader(message []byte) {
|
|
msgType, err := GetConsensusMessageType(message)
|
|
if err != nil {
|
|
consensus.Log.Error("Failed to get consensus message type.", "err", err, "consensus", consensus)
|
|
}
|
|
|
|
payload, err := GetConsensusMessagePayload(message)
|
|
if err != nil {
|
|
consensus.Log.Error("Failed to get consensus message payload.", "err", err, "consensus", consensus)
|
|
}
|
|
|
|
switch msgType {
|
|
case ANNOUNCE:
|
|
consensus.Log.Error("Unexpected message type", "msgType", msgType, "consensus", consensus)
|
|
case COMMIT:
|
|
consensus.processCommitMessage(payload)
|
|
case CHALLENGE:
|
|
consensus.Log.Error("Unexpected message type", "msgType", msgType, "consensus", consensus)
|
|
case RESPONSE:
|
|
consensus.processResponseMessage(payload)
|
|
case START_CONSENSUS:
|
|
consensus.processStartConsensusMessage(payload)
|
|
default:
|
|
consensus.Log.Error("Unexpected message type", "msgType", msgType, "consensus", consensus)
|
|
}
|
|
}
|
|
|
|
// Handler for message which triggers consensus process
|
|
func (consensus *Consensus) processStartConsensusMessage(payload []byte) {
|
|
startTime = time.Now()
|
|
tx := blockchain.NewCoinbaseTX("x", "y", 0)
|
|
consensus.startConsensus(blockchain.NewGenesisBlock(tx, 0))
|
|
}
|
|
|
|
func (consensus *Consensus) startConsensus(newBlock *blockchain.Block) {
|
|
// Copy over block hash and block header data
|
|
copy(consensus.blockHash[:], newBlock.Hash[:])
|
|
|
|
// prepare message and broadcast to validators
|
|
byteBuffer := bytes.NewBuffer([]byte{})
|
|
encoder := gob.NewEncoder(byteBuffer)
|
|
encoder.Encode(newBlock)
|
|
consensus.blockHeader = byteBuffer.Bytes()
|
|
|
|
msgToSend := consensus.constructAnnounceMessage()
|
|
p2p.BroadcastMessage(consensus.validators, msgToSend)
|
|
// Set state to ANNOUNCE_DONE
|
|
consensus.state = ANNOUNCE_DONE
|
|
}
|
|
|
|
// Construct the announce message to send to validators
|
|
func (consensus *Consensus) constructAnnounceMessage() []byte {
|
|
buffer := bytes.NewBuffer([]byte{})
|
|
|
|
// 4 byte consensus id
|
|
fourBytes := make([]byte, 4)
|
|
binary.BigEndian.PutUint32(fourBytes, consensus.consensusId)
|
|
buffer.Write(fourBytes)
|
|
|
|
// 32 byte block hash
|
|
buffer.Write(consensus.blockHash[:])
|
|
|
|
// 2 byte leader id
|
|
twoBytes := make([]byte, 2)
|
|
binary.BigEndian.PutUint16(twoBytes, consensus.nodeId)
|
|
buffer.Write(twoBytes)
|
|
|
|
// n byte of block header
|
|
buffer.Write(consensus.blockHeader)
|
|
|
|
// 4 byte of payload size
|
|
sizeOfPayload := uint32(len(consensus.blockHeader))
|
|
binary.BigEndian.PutUint32(fourBytes, sizeOfPayload)
|
|
buffer.Write(fourBytes)
|
|
|
|
// 64 byte of signature on previous data
|
|
signature := signMessage(buffer.Bytes())
|
|
buffer.Write(signature)
|
|
|
|
return consensus.ConstructConsensusMessage(ANNOUNCE, buffer.Bytes())
|
|
}
|
|
|
|
func signMessage(message []byte) []byte {
|
|
// TODO: implement real ECC signature
|
|
mockSignature := sha256.Sum256(message)
|
|
return append(mockSignature[:], mockSignature[:]...)
|
|
}
|
|
|
|
func (consensus *Consensus) processCommitMessage(payload []byte) {
|
|
//#### Read payload data
|
|
offset := 0
|
|
// 4 byte consensus id
|
|
consensusId := binary.BigEndian.Uint32(payload[offset : offset+4])
|
|
offset += 4
|
|
|
|
// 32 byte block hash
|
|
blockHash := payload[offset : offset+32]
|
|
offset += 32
|
|
|
|
// 2 byte validator id
|
|
validatorId := string(payload[offset : offset+2])
|
|
offset += 2
|
|
|
|
// 33 byte commit
|
|
commit := payload[offset : offset+33]
|
|
offset += 33
|
|
|
|
// 64 byte of signature on previous data
|
|
signature := payload[offset : offset+64]
|
|
offset += 64
|
|
//#### END: Read payload data
|
|
|
|
// TODO: make use of the data. This is just to avoid the unused variable warning
|
|
_ = commit
|
|
_ = signature
|
|
|
|
// check consensus Id
|
|
consensus.mutex.Lock()
|
|
defer consensus.mutex.Unlock()
|
|
if consensusId != consensus.consensusId {
|
|
consensus.Log.Warn("Received COMMIT with wrong consensus Id", "myConsensusId", consensus.consensusId, "theirConsensusId", consensusId, "consensus", consensus)
|
|
return
|
|
}
|
|
|
|
if bytes.Compare(blockHash, consensus.blockHash[:]) != 0 {
|
|
consensus.Log.Warn("Received COMMIT with wrong blockHash", "myConsensusId", consensus.consensusId, "theirConsensusId", consensusId, "consensus", consensus)
|
|
return
|
|
}
|
|
|
|
// proceed only when the message is not received before
|
|
_, ok := consensus.commits[validatorId]
|
|
shouldProcess := !ok
|
|
if shouldProcess {
|
|
consensus.commits[validatorId] = validatorId
|
|
//consensus.Log.Debug("Number of commits received", "consensusId", consensus.consensusId, "count", len(consensus.commits))
|
|
}
|
|
|
|
if !shouldProcess {
|
|
return
|
|
}
|
|
|
|
if len(consensus.commits) >= (2*len(consensus.validators))/3+1 && consensus.state < CHALLENGE_DONE {
|
|
consensus.Log.Debug("Enough commits received with signatures", "numOfSignatures", len(consensus.commits))
|
|
|
|
// Broadcast challenge
|
|
msgToSend := consensus.constructChallengeMessage()
|
|
p2p.BroadcastMessage(consensus.validators, msgToSend)
|
|
|
|
// Set state to CHALLENGE_DONE
|
|
consensus.state = CHALLENGE_DONE
|
|
}
|
|
}
|
|
|
|
// Construct the challenge message to send to validators
|
|
func (consensus *Consensus) constructChallengeMessage() []byte {
|
|
buffer := bytes.NewBuffer([]byte{})
|
|
|
|
// 4 byte consensus id
|
|
fourBytes := make([]byte, 4)
|
|
binary.BigEndian.PutUint32(fourBytes, consensus.consensusId)
|
|
buffer.Write(fourBytes)
|
|
|
|
// 32 byte block hash
|
|
buffer.Write(consensus.blockHash[:])
|
|
|
|
// 2 byte leader id
|
|
twoBytes := make([]byte, 2)
|
|
binary.BigEndian.PutUint16(twoBytes, consensus.nodeId)
|
|
buffer.Write(twoBytes)
|
|
|
|
// 33 byte aggregated commit
|
|
buffer.Write(getAggregatedCommit(consensus.commits))
|
|
|
|
// 33 byte aggregated key
|
|
buffer.Write(getAggregatedKey(consensus.commits))
|
|
|
|
// 32 byte challenge
|
|
buffer.Write(getChallenge())
|
|
|
|
// 64 byte of signature on previous data
|
|
signature := signMessage(buffer.Bytes())
|
|
buffer.Write(signature)
|
|
|
|
return consensus.ConstructConsensusMessage(CHALLENGE, buffer.Bytes())
|
|
}
|
|
|
|
func getAggregatedCommit(commits map[string]string) []byte {
|
|
// TODO: implement actual commit aggregation
|
|
var commitArray []string
|
|
for _, val := range commits {
|
|
commitArray = append(commitArray, val)
|
|
}
|
|
var commit [32]byte
|
|
commit = sha256.Sum256([]byte(strings.Join(commitArray, "")))
|
|
return append(commit[:], byte(0))
|
|
}
|
|
|
|
func getAggregatedKey(commits map[string]string) []byte {
|
|
// TODO: implement actual key aggregation
|
|
var commitArray []string
|
|
for key := range commits {
|
|
commitArray = append(commitArray, key)
|
|
}
|
|
var commit [32]byte
|
|
commit = sha256.Sum256([]byte(strings.Join(commitArray, "")))
|
|
return append(commit[:], byte(0))
|
|
}
|
|
|
|
func getChallenge() []byte {
|
|
// TODO: implement actual challenge data
|
|
return make([]byte, 32)
|
|
}
|
|
|
|
func (consensus *Consensus) processResponseMessage(payload []byte) {
|
|
//#### Read payload data
|
|
offset := 0
|
|
// 4 byte consensus id
|
|
consensusId := binary.BigEndian.Uint32(payload[offset : offset+4])
|
|
offset += 4
|
|
|
|
// 32 byte block hash
|
|
blockHash := payload[offset : offset+32]
|
|
offset += 32
|
|
|
|
// 2 byte validator id
|
|
validatorId := string(payload[offset : offset+2])
|
|
offset += 2
|
|
|
|
// 32 byte response
|
|
response := payload[offset : offset+32]
|
|
offset += 32
|
|
|
|
// 64 byte of signature on previous data
|
|
signature := payload[offset : offset+64]
|
|
offset += 64
|
|
//#### END: Read payload data
|
|
|
|
// TODO: make use of the data. This is just to avoid the unused variable warning
|
|
_ = consensusId
|
|
_ = blockHash
|
|
_ = response
|
|
_ = signature
|
|
|
|
shouldProcess := true
|
|
consensus.mutex.Lock()
|
|
// check consensus Id
|
|
if consensusId != consensus.consensusId {
|
|
shouldProcess = false
|
|
consensus.Log.Warn("Received RESPONSE with wrong consensus Id", "myConsensusId", consensus.consensusId, "theirConsensusId", consensusId, "consensus", consensus)
|
|
}
|
|
|
|
if bytes.Compare(blockHash, consensus.blockHash[:]) != 0 {
|
|
consensus.Log.Warn("Received RESPONSE with wrong blockHash", "myConsensusId", consensus.consensusId, "theirConsensusId", consensusId, "consensus", consensus)
|
|
return
|
|
}
|
|
|
|
// proceed only when the message is not received before
|
|
_, ok := consensus.responses[validatorId]
|
|
shouldProcess = shouldProcess && !ok
|
|
if shouldProcess {
|
|
consensus.responses[validatorId] = validatorId
|
|
//consensus.Log.Debug("Number of responses received", "consensusId", consensus.consensusId, "count", len(consensus.responses))
|
|
}
|
|
consensus.mutex.Unlock()
|
|
|
|
if !shouldProcess {
|
|
return
|
|
}
|
|
|
|
//consensus.Log.Debug("RECEIVED RESPONSE", "consensusId", consensusId)
|
|
if len(consensus.responses) >= (2*len(consensus.validators))/3+1 && consensus.state != FINISHED {
|
|
consensus.mutex.Lock()
|
|
if len(consensus.responses) >= (2*len(consensus.validators))/3+1 && consensus.state != FINISHED {
|
|
consensus.Log.Debug("Consensus reached with signatures.", "numOfSignatures", len(consensus.responses))
|
|
// Reset state to FINISHED, and clear other data.
|
|
consensus.ResetState()
|
|
consensus.consensusId++
|
|
consensus.Log.Debug("HOORAY!!! CONSENSUS REACHED!!!", "consensusId", consensus.consensusId)
|
|
|
|
// TODO: reconstruct the whole block from header and transactions
|
|
// For now, we used the stored whole block already stored in consensus.blockHeader
|
|
txDecoder := gob.NewDecoder(bytes.NewReader(consensus.blockHeader))
|
|
var blockHeaderObj blockchain.Block
|
|
err := txDecoder.Decode(&blockHeaderObj)
|
|
if err != nil {
|
|
consensus.Log.Debug("failed to construct the new block after consensus")
|
|
}
|
|
consensus.OnConsensusDone(&blockHeaderObj)
|
|
|
|
// TODO: @ricl these logic are irrelevant to consensus, move them to another file, say profiler.
|
|
endTime := time.Now()
|
|
timeElapsed := endTime.Sub(startTime)
|
|
numOfTxs := blockHeaderObj.NumTransactions
|
|
consensus.Log.Info("TPS Report", "numOfTXs", numOfTxs, "timeElapsed", timeElapsed, "TPS", float64(numOfTxs)/timeElapsed.Seconds())
|
|
|
|
var m runtime.MemStats
|
|
runtime.ReadMemStats(&m)
|
|
consensus.Log.Info("Mem Report", "Alloc", bToMb(m.Alloc), "TotalAlloc", bToMb(m.TotalAlloc),
|
|
"Sys", bToMb(m.Sys), "NumGC", m.NumGC)
|
|
|
|
// Send signal to Node so the new block can be added and new round of consensus can be triggered
|
|
consensus.ReadySignal <- 1
|
|
}
|
|
consensus.mutex.Unlock()
|
|
}
|
|
}
|
|
|
|
func bToMb(b uint64) uint64 {
|
|
return b / 1024 / 1024
|
|
}
|
|
|