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382 lines
14 KiB
382 lines
14 KiB
package node
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import (
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"bytes"
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"crypto/ecdsa"
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"encoding/gob"
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"fmt"
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"math/big"
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"math/rand"
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"net"
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"os"
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"strconv"
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"strings"
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"sync"
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"time"
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"github.com/ethereum/go-ethereum/crypto"
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"github.com/ethereum/go-ethereum/params"
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"github.com/harmony-one/harmony/blockchain"
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"github.com/harmony-one/harmony/client"
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bft "github.com/harmony-one/harmony/consensus"
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"github.com/harmony-one/harmony/core"
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"github.com/harmony-one/harmony/core/types"
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"github.com/harmony-one/harmony/core/vm"
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"github.com/harmony-one/harmony/crypto/pki"
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hdb "github.com/harmony-one/harmony/db"
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"github.com/harmony-one/harmony/log"
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"github.com/harmony-one/harmony/node/worker"
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"github.com/harmony-one/harmony/p2p"
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proto_node "github.com/harmony-one/harmony/proto/node"
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"github.com/harmony-one/harmony/syncing/downloader"
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downloader_pb "github.com/harmony-one/harmony/syncing/downloader/proto"
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)
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// State is a state of a node.
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type State byte
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// All constants except the NodeLeader below are for validators only.
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const (
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NodeInit State = iota // Node just started, before contacting BeaconChain
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NodeWaitToJoin // Node contacted BeaconChain, wait to join Shard
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NodeJoinedShard // Node joined Shard, ready for consensus
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NodeOffline // Node is offline
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NodeReadyForConsensus // Node is ready to do consensus
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NodeDoingConsensus // Node is already doing consensus
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NodeLeader // Node is the leader of some shard.
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)
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const (
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// TimeToSleepForSyncing is the time waiting for node transformed into NodeDoingConsensus
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TimeToSleepForSyncing = time.Second * 30
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)
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// NetworkNode ...
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type NetworkNode struct {
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SelfPeer p2p.Peer
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IDCPeer p2p.Peer
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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 *bft.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 *hdb.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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SelfPeer p2p.Peer // TODO(minhdoan): it could be duplicated with Self below whose is Alok work.
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IDCPeer p2p.Peer
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SyncNode bool // TODO(minhdoan): Remove it later.
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chain *core.BlockChain // Account Model
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Neighbors sync.Map // All the neighbor nodes, key is the sha256 of Peer IP/Port, value is the p2p.Peer
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State State // State of the Node
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// Account Model
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pendingTransactionsAccount types.Transactions // TODO: replace with txPool
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pendingTxMutexAccount sync.Mutex
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Chain *core.BlockChain
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TxPool *core.TxPool
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BlockChannelAccount chan *types.Block // The channel to receive new blocks from Node
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Worker *worker.Worker
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// Syncing component.
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downloaderServer *downloader.Server
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// Test only
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TestBankKeys []*ecdsa.PrivateKey
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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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// Add new transactions to the pending transaction list
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func (node *Node) addPendingTransactionsAccount(newTxs types.Transactions) {
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node.pendingTxMutexAccount.Lock()
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node.pendingTransactionsAccount = append(node.pendingTransactionsAccount, newTxs...)
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node.pendingTxMutexAccount.Unlock()
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node.log.Debug("Got more transactions (account model)", "num", len(newTxs), "totalPending", len(node.pendingTransactionsAccount), "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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// 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) getTransactionsForNewBlockAccount(maxNumTxs int) (types.Transactions, []*blockchain.CrossShardTxAndProof) {
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node.pendingTxMutexAccount.Lock()
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selected, unselected, invalid, crossShardTxs := node.pendingTransactionsAccount, types.Transactions{}, types.Transactions{}, []*blockchain.CrossShardTxAndProof{}
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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.pendingTransactionsAccount = unselected
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node.log.Debug("Remaining pending transactions", "number", len(node.pendingTransactionsAccount))
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node.pendingTxMutexAccount.Unlock()
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return selected, crossShardTxs //TODO: replace cross-shard proofs for account model
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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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// Disable this temporarily.
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// node.blockchain = syncing.StartBlockSyncing(node.Consensus.GetValidatorPeers())
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}
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fmt.Println("going to start server on port:", port)
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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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// SetLog sets log for Node.
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func (node *Node) SetLog() *Node {
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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) 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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// 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) countNumTransactionsInBlockchainAccount() int {
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count := 0
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for curBlock := node.Chain.CurrentBlock(); curBlock != nil; {
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count += len(curBlock.Transactions())
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curBlock = node.Chain.GetBlockByHash(curBlock.ParentHash())
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}
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return count
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}
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// SerializeNode 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) SerializeNode(nnode *NetworkNode) []byte {
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//Needs to escape the serialization of unexported fields
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var result bytes.Buffer
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encoder := gob.NewEncoder(&result)
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err := encoder.Encode(nnode)
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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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return result.Bytes()
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}
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// DeserializeNode deserializes the node
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func DeserializeNode(d []byte) *NetworkNode {
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var wn NetworkNode
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r := bytes.NewBuffer(d)
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decoder := gob.NewDecoder(r)
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err := decoder.Decode(&wn)
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if err != nil {
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log.Error("Could not de-serialize node 1")
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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 *bft.Consensus, db *hdb.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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// (account model)
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rand.Seed(0)
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len := 1000000
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bytes := make([]byte, len)
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for i := 0; i < len; i++ {
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bytes[i] = byte(rand.Intn(100))
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}
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reader := strings.NewReader(string(bytes))
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genesisAloc := make(core.GenesisAlloc)
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for i := 0; i < 100; i++ {
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testBankKey, _ := ecdsa.GenerateKey(crypto.S256(), reader)
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testBankAddress := crypto.PubkeyToAddress(testBankKey.PublicKey)
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testBankFunds := big.NewInt(10000000000)
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genesisAloc[testBankAddress] = core.GenesisAccount{Balance: testBankFunds}
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node.TestBankKeys = append(node.TestBankKeys, testBankKey)
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}
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database := hdb.NewMemDatabase()
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chainConfig := params.TestChainConfig
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chainConfig.ChainID = big.NewInt(int64(node.Consensus.ShardID)) // Use ChainId as piggybacked ShardId
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gspec := core.Genesis{
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Config: chainConfig,
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Alloc: genesisAloc,
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ShardId: uint32(node.Consensus.ShardID),
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}
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_ = gspec.MustCommit(database)
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chain, _ := core.NewBlockChain(database, nil, gspec.Config, bft.NewFaker(), vm.Config{}, nil)
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node.Chain = chain
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node.TxPool = core.NewTxPool(core.DefaultTxPoolConfig, params.TestChainConfig, chain)
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node.BlockChannelAccount = make(chan *types.Block)
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node.Worker = worker.New(params.TestChainConfig, chain, bft.NewFaker())
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}
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// Logger
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node.log = log.New()
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if consensus.IsLeader {
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node.State = NodeLeader
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} else {
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node.State = NodeInit
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}
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return &node
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}
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// AddPeers adds neighbors nodes
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func (node *Node) AddPeers(peers []p2p.Peer) int {
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count := 0
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for _, p := range peers {
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key := fmt.Sprintf("%v", p.PubKey)
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_, ok := node.Neighbors.Load(key)
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if !ok {
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node.Neighbors.Store(key, p)
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count++
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}
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}
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if count > 0 {
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node.Consensus.AddPeers(peers)
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}
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return count
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}
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// JoinShard helps a new node to join a shard.
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func (node *Node) JoinShard(leader p2p.Peer) {
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// try to join the shard, with 10 minutes time-out
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backoff := p2p.NewExpBackoff(1*time.Second, 10*time.Minute, 2)
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for node.State == NodeWaitToJoin {
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backoff.Sleep()
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ping := proto_node.NewPingMessage(node.SelfPeer)
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buffer := ping.ConstructPingMessage()
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p2p.SendMessage(leader, buffer)
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}
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}
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// SupportSyncing keeps sleeping until it's doing consensus or it's a leader.
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func (node *Node) SupportSyncing() {
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node.InitSyncingServer()
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node.StartSyncingServer()
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}
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// InitSyncingServer starts downloader server.
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func (node *Node) InitSyncingServer() {
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node.downloaderServer = downloader.NewServer(node)
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}
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// StartSyncingServer starts syncing server.
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func (node *Node) StartSyncingServer() {
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if port, err := strconv.Atoi(node.SelfPeer.Port); err == nil {
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node.downloaderServer.Start(node.SelfPeer.IP, fmt.Sprintf("%d", port-1000))
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} else {
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node.log.Error("Wrong port format provided")
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os.Exit(1)
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}
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}
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// CalculateResponse implements DownloadInterface on Node object.
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func (node *Node) CalculateResponse(request *downloader_pb.DownloaderRequest) (*downloader_pb.DownloaderResponse, error) {
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response := &downloader_pb.DownloaderResponse{}
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if request.Type == downloader_pb.DownloaderRequest_HEADER {
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for _, block := range node.blockchain.Blocks {
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response.Payload = append(response.Payload, block.Hash[:])
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}
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} else {
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for i := range request.Hashes {
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block := node.blockchain.FindBlock(request.Hashes[i])
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response.Payload = append(response.Payload, block.Serialize())
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}
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}
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return response, nil
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}
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