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289 lines
9.3 KiB
289 lines
9.3 KiB
package node
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import (
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"bytes"
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"encoding/gob"
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"harmony-benchmark/blockchain"
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"harmony-benchmark/client"
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"harmony-benchmark/common"
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"harmony-benchmark/consensus"
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"harmony-benchmark/p2p"
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"net"
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"os"
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"time"
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)
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const (
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// The max number of transaction per a block.
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MaxNumberOfTransactionsPerBlock = 3000
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)
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// NodeHandler handles a new incoming connection.
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func (node *Node) NodeHandler(conn net.Conn) {
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defer conn.Close()
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// Read p2p message payload
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content, err := p2p.ReadMessageContent(conn)
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if err != nil {
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node.log.Error("Read p2p data failed", "err", err, "node", node)
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return
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}
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consensusObj := node.Consensus
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msgCategory, err := common.GetMessageCategory(content)
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if err != nil {
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node.log.Error("Read node type failed", "err", err, "node", node)
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return
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}
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msgType, err := common.GetMessageType(content)
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if err != nil {
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node.log.Error("Read action type failed", "err", err, "node", node)
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return
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}
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msgPayload, err := common.GetMessagePayload(content)
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if err != nil {
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node.log.Error("Read message payload failed", "err", err, "node", node)
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return
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}
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switch msgCategory {
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case common.COMMITTEE:
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actionType := consensus.CommitteeMessageType(msgType)
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switch actionType {
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case consensus.CONSENSUS:
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if consensusObj.IsLeader {
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consensusObj.ProcessMessageLeader(msgPayload)
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} else {
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consensusObj.ProcessMessageValidator(msgPayload)
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}
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}
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case common.NODE:
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actionType := NodeMessageType(msgType)
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switch actionType {
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case TRANSACTION:
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node.transactionMessageHandler(msgPayload)
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case BLOCK:
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if node.Client != nil {
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blockMsgType := BlockMessageType(msgPayload[0])
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switch blockMsgType {
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case SYNC:
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decoder := gob.NewDecoder(bytes.NewReader(msgPayload[1:])) // skip the SYNC messge type
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blocks := new([]*blockchain.Block)
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decoder.Decode(blocks)
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if node.Client != nil && blocks != nil {
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node.Client.UpdateBlocks(*blocks)
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}
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}
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}
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case CONTROL:
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controlType := msgPayload[0]
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if ControlMessageType(controlType) == STOP {
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node.log.Debug("Stopping Node", "node", node, "numBlocks", len(node.blockchain.Blocks), "numTxsProcessed", node.countNumTransactionsInBlockchain())
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byteBuffer := bytes.NewBuffer([]byte{})
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encoder := gob.NewEncoder(byteBuffer)
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utxoPool := node.UtxoPool.GetSnapshot()
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encoder.Encode(utxoPool.UtxoMap)
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node.log.Debug("UtxoPool Report", "numEntries", len(node.UtxoPool.UtxoMap), "sizeInBytes", len(byteBuffer.Bytes()))
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avgBlockSizeInBytes := 0
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for _, block := range node.blockchain.Blocks {
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byteBuffer = bytes.NewBuffer([]byte{})
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encoder = gob.NewEncoder(byteBuffer)
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encoder.Encode(block)
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avgBlockSizeInBytes += len(byteBuffer.Bytes())
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}
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avgBlockSizeInBytes = avgBlockSizeInBytes / len(node.blockchain.Blocks)
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node.log.Debug("Blockchain Report", "numBlocks", len(node.blockchain.Blocks), "avgSizeInBytes", avgBlockSizeInBytes)
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os.Exit(0)
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}
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case EXPERIMENT:
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expType := msgPayload[0]
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switch ExperimentMessageType(expType) {
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case UTXO_REQUEST:
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node.log.Debug("Received UTXO request")
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p2p.SendMessage(*node.ClientPeer, ConstructUtxoResponseMessage(node.UtxoPool.GetSnapshot()))
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case UTXO_RESPONSE:
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node.log.Debug("Received UTXO response")
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decoder := gob.NewDecoder(bytes.NewReader(msgPayload[1:])) // skip the UTXO_RESPONSE messge type
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utxoPool := new(blockchain.UTXOPool)
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decoder.Decode(utxoPool)
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if node.Client != nil && utxoPool != nil {
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//node.Client.UpdateUtxoPool(*utxoPool)
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}
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}
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}
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case common.CLIENT:
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actionType := client.ClientMessageType(msgType)
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switch actionType {
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case client.TRANSACTION:
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if node.Client != nil {
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node.Client.TransactionMessageHandler(msgPayload)
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}
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}
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}
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}
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func (node *Node) transactionMessageHandler(msgPayload []byte) {
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txMessageType := TransactionMessageType(msgPayload[0])
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switch txMessageType {
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case SEND:
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txDecoder := gob.NewDecoder(bytes.NewReader(msgPayload[1:])) // skip the SEND messge type
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txList := new([]*blockchain.Transaction)
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err := txDecoder.Decode(&txList)
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if err != nil {
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node.log.Error("Failed deserializing transaction list", "node", node)
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}
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node.addPendingTransactions(*txList)
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case REQUEST:
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reader := bytes.NewBuffer(msgPayload[1:])
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var txIds map[[32]byte]bool
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buf := make([]byte, 32) // 32 byte hash Id
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for {
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_, err := reader.Read(buf)
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if err != nil {
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break
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}
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var txId [32]byte
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copy(txId[:], buf)
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txIds[txId] = true
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}
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var txToReturn []*blockchain.Transaction
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for _, tx := range node.pendingTransactions {
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if txIds[tx.ID] {
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txToReturn = append(txToReturn, tx)
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}
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}
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// TODO: return the transaction list to requester
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case UNLOCK:
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txAndProofDecoder := gob.NewDecoder(bytes.NewReader(msgPayload[1:])) // skip the UNLOCK messge type
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txAndProofs := new([]*blockchain.Transaction)
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err := txAndProofDecoder.Decode(&txAndProofs)
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if err != nil {
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node.log.Error("Failed deserializing transaction and proofs list", "node", node)
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}
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node.log.Debug("RECEIVED UNLOCK MESSAGE", "num", len(*txAndProofs))
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node.addPendingTransactions(*txAndProofs)
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}
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}
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// WaitForConsensusReady ...
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func (node *Node) WaitForConsensusReady(readySignal chan int) {
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node.log.Debug("Waiting for Consensus ready", "node", node)
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var newBlock *blockchain.Block
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timeoutCount := 0
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for { // keep waiting for Consensus ready
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retry := false
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select {
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case <-readySignal:
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time.Sleep(100 * time.Millisecond) // Delay a bit so validator is catched up.
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case <-time.After(8 * time.Second):
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retry = true
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node.Consensus.ResetState()
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timeoutCount++
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node.log.Debug("Consensus timeout, retry!", "count", timeoutCount, "node", node)
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}
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//node.log.Debug("Adding new block", "currentChainSize", len(node.blockchain.Blocks), "numTxs", len(node.blockchain.GetLatestBlock().Transactions), "PrevHash", node.blockchain.GetLatestBlock().PrevBlockHash, "Hash", node.blockchain.GetLatestBlock().Hash)
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if !retry {
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for {
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// Once we have more than 10 transactions pending we will try creating a new block
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if len(node.pendingTransactions) >= 100 {
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selectedTxs, crossShardTxAndProofs := node.getTransactionsForNewBlock(MaxNumberOfTransactionsPerBlock)
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if len(selectedTxs) == 0 {
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node.log.Debug("No valid transactions exist", "pendingTx", len(node.pendingTransactions))
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} else {
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node.log.Debug("Creating new block", "numTxs", len(selectedTxs), "pendingTxs", len(node.pendingTransactions), "currentChainSize", len(node.blockchain.Blocks))
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node.transactionInConsensus = selectedTxs
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node.log.Debug("CROSS SHARD TX", "num", len(crossShardTxAndProofs))
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node.CrossTxsInConsensus = crossShardTxAndProofs
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newBlock = blockchain.NewBlock(selectedTxs, node.blockchain.GetLatestBlock().Hash, node.Consensus.ShardID)
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break
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}
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}
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// If not enough transactions to run Consensus,
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// periodically check whether we have enough transactions to package into block.
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time.Sleep(1 * time.Second)
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}
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}
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// Send the new block to Consensus so it can be confirmed.
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if newBlock != nil {
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node.BlockChannel <- *newBlock
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}
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}
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}
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// This is called by consensus participants to verify the block they are running consensus on
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func (node *Node) SendBackProofOfAcceptOrReject() {
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if node.ClientPeer != nil && len(node.CrossTxsToReturn) != 0 {
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node.crossTxToReturnMutex.Lock()
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proofs := []blockchain.CrossShardTxProof{}
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for _, txAndProof := range node.CrossTxsToReturn {
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proofs = append(proofs, *txAndProof.Proof)
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}
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node.CrossTxsToReturn = nil
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node.crossTxToReturnMutex.Unlock()
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node.log.Debug("SENDING PROOF TO CLIENT", "proofs", len(proofs))
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p2p.SendMessage(*node.ClientPeer, client.ConstructProofOfAcceptOrRejectMessage(proofs))
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}
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}
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// This is called by consensus leader to sync new blocks with other clients/nodes.
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// NOTE: For now, just send to the client (basically not broadcasting)
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func (node *Node) BroadcastNewBlock(newBlock *blockchain.Block) {
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if node.ClientPeer != nil {
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node.log.Debug("SENDING NEW BLOCK TO CLIENT")
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p2p.SendMessage(*node.ClientPeer, ConstructBlocksSyncMessage([]blockchain.Block{*newBlock}))
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}
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}
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// This is called by consensus participants to verify the block they are running consensus on
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func (node *Node) VerifyNewBlock(newBlock *blockchain.Block) bool {
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return node.UtxoPool.VerifyTransactions(newBlock.Transactions)
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}
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// This is called by consensus participants, after consensus is done, to:
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// 1. add the new block to blockchain
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// 2. [leader] move cross shard tx and proof to the list where they wait to be sent to the client
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func (node *Node) PostConsensusProcessing(newBlock *blockchain.Block) {
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node.AddNewBlock(newBlock)
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if node.Consensus.IsLeader {
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// Move crossTx-in-consensus into the list to be returned to client
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for _, crossTxAndProof := range node.CrossTxsInConsensus {
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crossTxAndProof.Proof.BlockHash = newBlock.Hash
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// TODO: fill in the signature proofs
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}
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if len(node.CrossTxsInConsensus) != 0 {
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node.addCrossTxsToReturn(node.CrossTxsInConsensus)
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node.CrossTxsInConsensus = []*blockchain.CrossShardTxAndProof{}
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}
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node.SendBackProofOfAcceptOrReject()
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node.BroadcastNewBlock(newBlock)
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}
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}
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func (node *Node) AddNewBlock(newBlock *blockchain.Block) {
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// Add it to blockchain
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node.blockchain.Blocks = append(node.blockchain.Blocks, newBlock)
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// Update UTXO pool
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node.UtxoPool.Update(newBlock.Transactions)
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// Clear transaction-in-Consensus list
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node.transactionInConsensus = []*blockchain.Transaction{}
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}
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