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250 lines
9.2 KiB
250 lines
9.2 KiB
package node
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import (
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"bytes"
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"encoding/gob"
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"fmt"
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"net"
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"sync"
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"time"
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"github.com/simple-rules/harmony-benchmark/blockchain"
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"github.com/simple-rules/harmony-benchmark/client"
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"github.com/simple-rules/harmony-benchmark/consensus"
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"github.com/simple-rules/harmony-benchmark/crypto/pki"
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"github.com/simple-rules/harmony-benchmark/db"
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"github.com/simple-rules/harmony-benchmark/log"
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"github.com/simple-rules/harmony-benchmark/p2p"
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"github.com/simple-rules/harmony-benchmark/pow"
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"github.com/simple-rules/harmony-benchmark/proto/identity"
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"github.com/simple-rules/harmony-benchmark/syncing"
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)
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// Node represents a program (machine) participating in the network
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// TODO(minhdoan, rj): consider using BlockChannel *chan blockchain.Block for efficiency.
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type Node struct {
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Consensus *consensus.Consensus // Consensus object containing all Consensus related data (e.g. committee members, signatures, commits)
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BlockChannel chan blockchain.Block // The channel to receive new blocks from Node
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pendingTransactions []*blockchain.Transaction // All the transactions received but not yet processed for Consensus
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transactionInConsensus []*blockchain.Transaction // The transactions selected into the new block and under Consensus process
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blockchain *blockchain.Blockchain // The blockchain for the shard where this node belongs
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db *db.LDBDatabase // LevelDB to store blockchain.
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UtxoPool *blockchain.UTXOPool // The corresponding UTXO pool of the current blockchain
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CrossTxsInConsensus []*blockchain.CrossShardTxAndProof // The cross shard txs that is under consensus, the proof is not filled yet.
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CrossTxsToReturn []*blockchain.CrossShardTxAndProof // The cross shard txs and proof that needs to be sent back to the user client.
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log log.Logger // Log utility
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pendingTxMutex sync.Mutex
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crossTxToReturnMutex sync.Mutex
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ClientPeer *p2p.Peer // The peer for the benchmark tx generator client, used for leaders to return proof-of-accept
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Client *client.Client // The presence of a client object means this node will also act as a client
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IsWaiting bool
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SelfPeer p2p.Peer // TODO(minhdoan): it could be duplicated with Self below whose is Alok work.
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Self p2p.Peer
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IDCPeer p2p.Peer
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SyncNode bool // TODO(minhdoan): Remove it later.
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}
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// Add new crossTx and proofs to the list of crossTx that needs to be sent back to client
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func (node *Node) addCrossTxsToReturn(crossTxs []*blockchain.CrossShardTxAndProof) {
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node.crossTxToReturnMutex.Lock()
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node.CrossTxsToReturn = append(node.CrossTxsToReturn, crossTxs...)
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node.crossTxToReturnMutex.Unlock()
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node.log.Debug("Got more cross transactions to return", "num", len(crossTxs), len(node.pendingTransactions), "node", node)
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}
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// Add new transactions to the pending transaction list
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func (node *Node) addPendingTransactions(newTxs []*blockchain.Transaction) {
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node.pendingTxMutex.Lock()
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node.pendingTransactions = append(node.pendingTransactions, newTxs...)
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node.pendingTxMutex.Unlock()
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node.log.Debug("Got more transactions", "num", len(newTxs), "totalPending", len(node.pendingTransactions), "node", node)
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}
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// Take out a subset of valid transactions from the pending transaction list
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// Note the pending transaction list will then contain the rest of the txs
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func (node *Node) getTransactionsForNewBlock(maxNumTxs int) ([]*blockchain.Transaction, []*blockchain.CrossShardTxAndProof) {
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node.pendingTxMutex.Lock()
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selected, unselected, invalid, crossShardTxs := node.UtxoPool.SelectTransactionsForNewBlock(node.pendingTransactions, maxNumTxs)
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_ = invalid // invalid txs are discard
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node.log.Debug("Invalid transactions discarded", "number", len(invalid))
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node.pendingTransactions = unselected
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node.pendingTxMutex.Unlock()
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return selected, crossShardTxs
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}
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// StartServer starts a server and process the request by a handler.
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func (node *Node) StartServer(port string) {
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if node.SyncNode {
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node.blockchain = syncing.StartBlockSyncing(node.Consensus.GetValidatorPeers())
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}
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fmt.Println("Hello in server now")
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node.log.Debug("Starting server", "node", node, "port", port)
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node.listenOnPort(port)
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}
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func (node *Node) listenOnPort(port string) {
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addr := net.JoinHostPort("", port)
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listen, err := net.Listen("tcp4", addr)
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if err != nil {
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node.log.Error("Socket listen port failed", "addr", addr, "err", err)
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return
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}
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if listen == nil {
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node.log.Error("Listen returned nil", "addr", addr)
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return
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}
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defer listen.Close()
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backoff := p2p.NewExpBackoff(250*time.Millisecond, 15*time.Second, 2.0)
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for {
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conn, err := listen.Accept()
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if err != nil {
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node.log.Error("Error listening on port.", "port", port,
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"err", err)
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backoff.Sleep()
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continue
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}
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go node.NodeHandler(conn)
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}
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}
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func (node *Node) String() string {
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return node.Consensus.String()
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}
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// Count the total number of transactions in the blockchain
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// Currently used for stats reporting purpose
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func (node *Node) countNumTransactionsInBlockchain() int {
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count := 0
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for _, block := range node.blockchain.Blocks {
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count += len(block.Transactions)
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}
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return count
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}
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//ConnectIdentityChain connects to identity chain
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func (node *Node) ConnectIdentityChain() {
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IDCPeer := node.IDCPeer
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p2p.SendMessage(IDCPeer, identity.ConstructIdentityMessage(identity.ANNOUNCE, node.SerializeWaitNode()))
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return
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}
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//NewWaitNode is a way to initiate a waiting no
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func NewWaitNode(peer, IDCPeer p2p.Peer) *Node {
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node := Node{}
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node.Self = peer
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node.IDCPeer = IDCPeer
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node.log = log.New()
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return &node
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}
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// NewNodefromIDC is the new node for identity chain.
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func NewNodefromIDC(node *Node, consensus *consensus.Consensus, db *db.LDBDatabase) *Node {
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if consensus != nil {
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// Consensus and associated channel to communicate blocks
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node.Consensus = consensus
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node.BlockChannel = make(chan blockchain.Block)
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// Genesis Block
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// TODO(minh): Use or implement new function in blockchain package for this.
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genesisBlock := &blockchain.Blockchain{}
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genesisBlock.Blocks = make([]*blockchain.Block, 0)
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// TODO(RJ): use miner's address as coinbase address
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coinbaseTx := blockchain.NewCoinbaseTX(pki.GetAddressFromInt(1), "0", node.Consensus.ShardID)
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genesisBlock.Blocks = append(genesisBlock.Blocks, blockchain.NewGenesisBlock(coinbaseTx, node.Consensus.ShardID))
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node.blockchain = genesisBlock
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// UTXO pool from Genesis block
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//node.UtxoPool = blockchain.CreateUTXOPoolFromGenesisBlockChain(node.blockchain)
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// Initialize level db.
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node.db = db
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}
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// Logger
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node.log = log.New()
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return node
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}
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func (node *Node) processPOWMessage(message []byte) {
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payload, err := identity.GetIdentityMessagePayload(message)
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if err != nil {
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fmt.Println("Could not read payload")
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}
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IDCPeer := node.IDCPeer
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// 4 byte challengeNonce id
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req := string(payload)
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proof, _ := pow.Fulfil(req, []byte("")) //"This could be blockhasdata"
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buffer := bytes.NewBuffer([]byte{})
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proofBytes := make([]byte, 32) //proof seems to be 32 byte here
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copy(proofBytes[:], proof)
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buffer.Write(proofBytes)
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buffer.Write(node.SerializeWaitNode())
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msgPayload := buffer.Bytes()
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p2p.SendMessage(IDCPeer, identity.ConstructIdentityMessage(identity.REGISTER, msgPayload))
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}
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// SerializeWaitNode serializes the node
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// https://stackoverflow.com/questions/12854125/how-do-i-dump-the-struct-into-the-byte-array-without-reflection/12854659#12854659
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func (node *Node) SerializeWaitNode() []byte {
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//Needs to escape the serialization of unexported fields
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result := new(bytes.Buffer)
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encoder := gob.NewEncoder(result)
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err := encoder.Encode(node.Self)
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if err != nil {
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fmt.Println("Could not serialize node")
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fmt.Println("ERROR", err)
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//node.log.Error("Could not serialize node")
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}
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err = encoder.Encode(node.IDCPeer)
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return result.Bytes()
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}
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// DeserializeWaitNode deserializes the node
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func DeserializeWaitNode(d []byte) *Node {
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var wn Node
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r := bytes.NewBuffer(d)
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decoder := gob.NewDecoder(r)
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err := decoder.Decode(&wn.Self)
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if err != nil {
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log.Error("Could not de-serialize node")
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}
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err = decoder.Decode(&wn.IDCPeer)
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if err != nil {
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log.Error("Could not de-serialize node")
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}
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return &wn
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}
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// New creates a new node.
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func New(consensus *consensus.Consensus, db *db.LDBDatabase) *Node {
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node := Node{}
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if consensus != nil {
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// Consensus and associated channel to communicate blocks
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node.Consensus = consensus
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node.BlockChannel = make(chan blockchain.Block)
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// Genesis Block
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// TODO(minh): Use or implement new function in blockchain package for this.
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genesisBlock := &blockchain.Blockchain{}
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genesisBlock.Blocks = make([]*blockchain.Block, 0)
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// TODO(RJ): use miner's address as coinbase address
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coinbaseTx := blockchain.NewCoinbaseTX(pki.GetAddressFromInt(1), "0", node.Consensus.ShardID)
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genesisBlock.Blocks = append(genesisBlock.Blocks, blockchain.NewGenesisBlock(coinbaseTx, node.Consensus.ShardID))
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node.blockchain = genesisBlock
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// UTXO pool from Genesis block
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node.UtxoPool = blockchain.CreateUTXOPoolFromGenesisBlock(node.blockchain.Blocks[0])
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// Initialize level db.
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node.db = db
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}
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// Logger
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node.log = log.New()
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return &node
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}
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