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Blockchain.js
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/**
iZ³ | Izzzio blockchain - https://izzz.io
@author: Andrey Nedobylsky (admin@twister-vl.ru)
*/
'use strict';
/**
* Blockchain constructor
* @param {object} config
* @constructor
*/
function Blockchain(config) {
const logger = new (require('./modules/logger'))();
let blockchainObject = null;
const fs = require('fs-extra');
const getid = require('./modules/getid');
const genesisTiemstamp = config.genesisTiemstamp;
const CryptoJS = require("crypto-js");
const express = require("express");
const auth = require('http-auth');
const bodyParser = require('body-parser');
const WebSocket = require("ws");
const levelup = require('level');
const Sync = require('sync');
const moment = require('moment');
const url = require('url');
const Block = require('./modules/block');
const Signable = require('./modules/blocks/signable');
const Wallet = require('./modules/wallet');
const BlockHandler = require('./modules/blockHandler');
const Transactor = require('./modules/transactor');
const MessagesDispatcher = require('./modules/messagesDispatcher');
const Frontend = require('./modules/frontend');
const app = express();
const storj = require('./modules/instanceStorage');
storj.put('app', app);
storj.put('config', config);
const blockController = new (require('./modules/blockchain'))();
const basic = auth.basic({
realm: "RPC Auth"
}, (username, password, callback) => {
if(config.rpcPassword.length === 0) {
callback(true);
return;
}
callback(password === config.rpcPassword);
}
);
if(config.rpcPassword.length !== 0) {
app.use(auth.connect(basic));
}
app.use(bodyParser.urlencoded({ // to support URL-encoded bodies
extended: false
}));
app.use(bodyParser.json());
console.log('Initialize...');
console.log('');
console.log('Message bus address: ' + config.recieverAddress);
console.log('');
let wallet = Wallet(config.walletFile, config).init();
storj.put('wallet', wallet);
logger.info('Wallet address ' + wallet.getAddress(false));
if(wallet.block !== -1) {
logger.info('Tiny address ' + wallet.getAddress(true));
wallet.block = -1;
}
console.log('');
/**
* База данных блоков
*/
// let blockchain = levelup(config.workDir + '/blocks');
let blockchain = blockController;
storj.put('blocks', blockchain);
/**
* Типы сообщений в p2p сети
* @type {{QUERY_LATEST: number, QUERY_ALL: number, RESPONSE_BLOCKCHAIN: number, MY_PEERS: number, BROADCAST: number}}
*/
const MessageType = {
QUERY_LATEST: 0,
QUERY_ALL: 1,
RESPONSE_BLOCKCHAIN: 2,
MY_PEERS: 3,
BROADCAST: 4
};
let maxBlock = -1;
let lastKnownBlock = -1;
let peers = config.initialPeers;
let peersBlackList = [];
let lastMsgIndex = 0;
let messagesHandlers = [];
/**
* Модуль, работающий с блоками разных типов
* @type {BlockHandler}
*/
const blockHandler = new BlockHandler(wallet, blockchain, blockchainObject, config, {acceptCount: config.blockAcceptCount});
storj.put('blockHandler', blockHandler);
/**
* Модуль, следящий за прохождением транзакций
* @type {Transactor}
*/
const transactor = new Transactor(wallet, blockchain, {
acceptCount: config.blockAcceptCount,
blockHandler: blockHandler
}, blockchainObject);
storj.put('transactor', transactor);
/**
* Фронтенд с интерфейсом и RPC
* @type {Frontend}
*/
const frontend = new Frontend(
wallet,
blockchain,
transactor,
blockHandler,
app,
blockchainObject,
{
blocksToAccept: config.blockAcceptCount,
genesisTiemstamp: genesisTiemstamp,
precision: config.precision
},
/**
* Позволяет фронтенду получить инфу о последнем блоке
* @param {Function} cb
*/
function getLastBlock(cb) {
getLatestBlock(function (lastestBlock) {
cb(lastestBlock, lastKnownBlock);
});
},
/**
* Просто передаёт всякую информацию во фронтенд
* @param {Function} cb
*/
function getSomeInfo(cb) {
cb(miningNow, miningForce, getCurrentPeers());
},
/**
* Запускает выполнение транзакции перевода
* @param {string} reciever
* @param {float} amount
* @param {function} transactCallback
* @return {boolean}
*/
function transact(reciever, amount, fromTimestamp, transactCallback) {
wallet.transanctions = [];
if(!wallet.transact(reciever, amount, fromTimestamp)) {
return false;
}
let blockData = wallet.transanctions.pop();
transactor.transact(blockData, function (blockData, cb) {
generateNextBlockAuto(blockData, function (generatedBlock) {
addBlock(generatedBlock);
broadcastLastBlock();
cb(generatedBlock);
transactCallback(generatedBlock);
});
}, function () {
logger.info('Transaction accepted');
});
return true;
},
/**
* Запускает принудительную пересинхронизацию сети
*/
function hardResync() {
//Hard resync
logger.warning('Hard synchronization started!');
blockchain.close(function () {
fs.removeSync(config.workDir + '/blocks');
blockchain = levelup(config.workDir + '/blocks');
blockHandler.clearDb(function () {
maxBlock = -1;
addBlockToChain(getGenesisBlock());
process.exit();
});
});
}
);
blockHandler.transactor = transactor;
blockHandler.frontend = frontend;
storj.put('frontend', frontend);
blockHandler.index.registerRPCMethods();
//************************************************************************************
const sockets = [];
let miningNow = 0;
let miningForce = '';
/**
* Порождающий блок
* @returns {Block}
*/
function getGenesisBlock() {
let data = "New epoch begins here! *solemn music on the background* *loud applause*";
let hash = calculateHash(0, 0, genesisTiemstamp, data);
let genesisBlock = new Block(0, "0", genesisTiemstamp, data, hash, genesisTiemstamp, '');
if(Math.round(new Date().getTime()) <= genesisTiemstamp) {
logger.error('Whoops! Check the clock');
process.exit();
}
return genesisBlock
}
/**
* Добавляет блок в определенное место цепочки
* @param index
* @param block
* @param {Boolean} noHandle
* @param cb
*/
function addBlockToChainIndex(index, block, noHandle, cb) {
if(block.index > maxBlock) {
maxBlock = block.index;
blockchain.put('maxBlock', maxBlock);
storj.put('maxBlock', maxBlock);
}
blockHandler.changeMaxBlock(maxBlock);
transactor.changeMaxBlock(maxBlock);
blockchain.put(Number(index), JSON.stringify(block), function () {
if(!noHandle) {
blockHandler.handleBlock(block, cb);
} else {
if(cb) {
cb();
}
}
});
}
/**
* Добавляет блок в конец цепочки
* @param block
* @param {Boolean} noHandle
* @param {Function} cb
*/
function addBlockToChain(block, noHandle, cb) {
if(block.index > maxBlock) {
maxBlock = block.index;
blockchain.put('maxBlock', maxBlock);
storj.put('maxBlock', maxBlock);
}
if(!noHandle) {
noHandle = false;
}
addBlockToChainIndex(maxBlock, block, noHandle, cb);
}
//Врапперы для модуля Sync, а то он любит портить this объекта
function exBlockhainGet(index, callback) {
blockchain.get(index, callback);
}
function exBlockHandler(result, callback) {
blockHandler.handleBlock(JSON.parse(result), callback)
}
/**
* Запуск ноды
*/
function startNode(cb) {
//Запуск новой цепочки
blockchain.get(0, function (err, value) {
if(err) {
let genesisBlock = getGenesisBlock();
if(!config.validators[0].isValidHash(genesisBlock.hash)) {
logger.error('Invalid genesis hash: ' + genesisBlock.hash);
process.exit();
}
addBlockToChain(getGenesisBlock());
logger.info('New blockchain fork started');
setTimeout(startBlockchainServers, 1000);
cb();
} else {
logger.info('Loading saved chain...');
blockchain.get('maxBlock', function (err, value) {
if(err) {
logger.error('Database failure. Repair or resync database!');
return;
}
maxBlock = Number(value);
storj.put('maxBlock', maxBlock);
lastKnownBlock = maxBlock;
logger.info('Block count: ' + maxBlock);
blockHandler.changeMaxBlock(maxBlock);
transactor.changeMaxBlock(maxBlock);
blockHandler.enableLogging = false;
wallet.enableLogging = false;
if(config.program.fastLoad) {
blockHandler.enableLogging = true;
wallet.enableLogging = true;
wallet.update();
setTimeout(startBlockchainServers, 1000);
logger.info('Blocks database opened');
cb();
} else {
blockHandler.playBlockchain(0, function () {
logger.info('Blocks loaded!\n');
blockHandler.enableLogging = true;
wallet.enableLogging = true;
wallet.update();
setTimeout(startBlockchainServers, 1000);
cb();
});
}
});
}
});
}
/**
* Запуск сервера интерфейса
*/
function initHttpServer() {
app.get('/blocks', (req, res) => {
Sync(function () {
res.writeHead(200, {
'Content-Type': 'application/json',
'Content-Disposition': 'attachment; filename="blockchain.json"'
});
res.write('[');
for (let i = 0; i < maxBlock + 1; i++) {
let result;
try {
result = exBlockhainGet.sync(null, i);
} catch (e) {
continue;
}
res.write(JSON.stringify(result) + ',');
}
res.write(']');
res.end();
});
});
app.get('/peers', (req, res) => {
res.send(getCurrentPeers());
});
app.post('/addPeer', (req, res) => {
connectToPeers([req.body.peer]);
res.send();
});
app.get('/broadcastPeers', (req, res) => {
broadcastConnectedPeers();
res.send('');
});
let server = app.listen(config.httpPort, config.httpServer, () => logger.init('Listening http on: ' + config.httpServer + ':' + config.httpPort + '@' + config.rpcPassword));
server.timeout = 0;
}
/**
* Запуск P2P сервера
*/
function initP2PServer() {
let wss = null;
if(config.sslMode) {
const https = require('https');
const server = https.createServer().listen(config.p2pPort);
wss = new WebSocket.Server({server});
console.log("\n!!!Warning: Node running in SSL mode. This mode can be used only by public nodes with correct certeficate.\n")
} else {
wss = new WebSocket.Server({port: config.p2pPort, perMessageDeflate: false});
}
wss.on('connection', function (ws) {
if(config.program.verbose) {
logger.info('Input connection ' + ws._socket.remoteAddress);
}
initConnection(ws)
});
logger.init('Listening p2p port on: ' + config.p2pPort);
}
let connections = 0;
/**
* Инициализация p2p соединения
* @param ws
*/
function initConnection(ws) {
if(peersBlackList.indexOf(ws._socket.remoteAddress) !== -1) {
if(config.program.verbose) {
logger.info('Blacklisted peer ' + ws._socket.remoteAddress);
}
ws.close();
return;
}
for (let i in sockets) {
if(sockets.hasOwnProperty(i)) {
if(
sockets[i]._socket.remoteAddress === ws._socket.remoteAddress &&
sockets[i]._socket.remotePort === ws._socket.remotePort &&
sockets[i].readyState === 1 &&
!sockets[i]._isServer &&
!config.program.ignoreDoubleConnections
) {
if(config.program.verbose) {
logger.info('Dublicated peer ' + ws._socket.remoteAddress);
}
ws.close();
return;
}
if(sockets[i].readyState !== 1) {
if(config.program.verbose) {
logger.info('Connection Not ready. Peer ' + ws._socket.remoteAddress);
}
ws.close();
return;
}
}
}
p2pErrorHandler(ws);
sockets.push(ws);
initMessageHandler(ws);
write(ws, queryChainLengthMsg());
write(ws, queryChainLengthMsg());
sendAllBlockchain(ws, maxBlock - 1);
/*write(ws, createMessage({
address: config.recieverAddress,
version: '1.0'
}, config.recieverAddress, config.recieverAddress, 'VITAMIN_META', lastMsgIndex, config.TTL + 1));*/
}
/**
* Обработчик сообщений P2P
* @param ws
*/
function initMessageHandler(ws) {
ws.on('message', (data) => {
if(data.length > config.maximumInputSize) {
if(config.program.verbose) {
logger.error('Input message exceeds maximum input size (' + data.length + ' > ' + config.maximumInputSize + ')');
}
data = null;
return;
}
let message;
try {
message = JSON.parse(data);
} catch (e) {
logger.error('' + e)
}
//console.log(message);
switch (message.type) {
case MessageType.QUERY_LATEST:
responseLatestMsg(function (msg) {
write(ws, msg);
});
break;
case MessageType.QUERY_ALL:
sendAllBlockchain(ws, message.data, message.limit);
break;
case MessageType.RESPONSE_BLOCKCHAIN:
handleBlockchainResponse(message);
break;
case MessageType.MY_PEERS:
if(!storj.get('peerExchangeMutex')) { //Блокируем получение списка пиров на таймаут обмена
storj.put('peerExchangeMutex', true);
setTimeout(function () {
storj.put('peerExchangeMutex', false);
}, config.peerExchangeInterval);
connectToPeers(message.data);
}
break;
case MessageType.BROADCAST:
/**
* Проходимся по обработчикам входящих сообщений
*/
for (let a in messagesHandlers) {
if(messagesHandlers.hasOwnProperty(a)) {
if(messagesHandlers[a].handle(message)) {
lastMsgIndex = message.index;
break; //Если сообщение обработано, выходим
}
}
}
if(message.reciver !== config.recieverAddress && config.enableMessaging && message.TTL <= config.messagingMaxTTL /*&& lastMsgIndex < message.index*/) {
if(isNaN(message.TTL)) {
message.TTL = 1;
}
if(typeof message.ttlList === 'undefined') {
message.ttlList = [];
}
message.ttlList.push({TTL: message.TTL, host: config.recieverAddress + ':' + 'NODE'});
message.TTL++;
broadcast(message, ws._socket.remoteAddress);
message.data = '';
} else {
if(message.id === 'VITAMIN_META' && message.reciver !== config.recieverAddress && typeof message.yourIp === 'undefined') {
message.yourIp = ws._socket.remoteAddress;
message.modifer = 'iZ3 node ' + config.recieverAddress;
message.TTL++;
//broadcast(message);
} else if(message.reciver === config.recieverAddress && message.id === 'VITAMIN_META' && typeof message.yourIp !== 'undefined') {
if(peersBlackList.indexOf(message.yourIp) === -1 && config.blacklisting) {
logger.info('Add ip to blacklist ' + message.yourIp);
peersBlackList.push(message.yourIp);
}
} else {
/* if(lastMsgIndex >= message.index) {
console.log(message);
}*/
}
}
lastMsgIndex = message.index;
break;
}
});
}
/**
* Добавляет обработчик сообщения
* @param {string} id
* @param {Function} handler
*/
function registerMessageHandler(id, handler) {
messagesHandlers.push({id: id, handle: handler});
}
/**
* Собирает из базы всю цепь блоков и отправляет её тому, кто запросил
* @param ws
* @param fromBlock
* @param limit
*/
function sendAllBlockchain(ws, fromBlock, limit) {
/**
* Если запрос идет с блока меньше 5, то разрешаем синхронизацию по 1 блоку
* для корректной обработки блока с выпуском ключей
* @type {number}
*/
fromBlock = (typeof fromBlock === 'undefined' ? 0 : Number(fromBlock));
if(fromBlock < 5) {
limit = 3;
}
getAllChain(fromBlock, limit, function (blockchain) {
write(ws, responseChainMsg(blockchain));
});
}
/**
* Собираем всю цепочку воедино
* @param fromBlock
* @param limit
* @param cb
*/
function getAllChain(fromBlock, limit, cb) {
limit = typeof limit === 'undefined' ? maxBlock : fromBlock + limit;
let blockchain = [];
Sync(function () {
let limiter = 0;
for (let i = fromBlock; i < limit + 1; i++) {
let result;
try {
result = exBlockhainGet.sync(null, i);
} catch (e) {
continue;
}
blockchain.push(JSON.parse(result));
limiter++;
if(limiter > config.maxBlockSend) {
break;
}
}
cb(blockchain);
});
}
/**
* Отлов ошибок сети
* @param ws
*/
function p2pErrorHandler(ws) {
let closeConnection = (ws) => {
sockets.splice(sockets.indexOf(ws), 1);
ws.close();
};
ws.on('close', () => closeConnection(ws));
ws.on('error', () => closeConnection(ws));
}
/**
* Считает хеш для объекта блока
* @param block
* @returns {*|string|a}
*/
function calculateHashForBlock(block) {
return calculateHash(block.index, block.previousHash, block.timestamp, block.data, block.startTimestamp, '');
}
/**
* Хеш блоков
* @param index
* @param previousHash
* @param timestamp
* @param startTimestamp
* @param sign
* @param data
* @returns {*|string|a}
*/
function calculateHash(index, previousHash, timestamp, data, startTimestamp, sign) {
return CryptoJS.SHA256(String(index) + previousHash + String(timestamp) + String(startTimestamp) + String(sign) + JSON.stringify(data)).toString();
}
/**
* Добавляет блок в цепочку с проверкой
* @param newBlock
* @param cb
*/
function addBlock(newBlock, cb) {
getLatestBlock(function (lastestBlock) {
if(isValidNewBlock(newBlock, lastestBlock)) {
addBlockToChain(newBlock, false, cb);
} else {
logger.error("Trying add invalid block");
if(cb) {
cb();
}
}
});
}
/**
* Проверка нового блока на соответствие требованиям
* @param {Block} newBlock
* @param {Block} previousBlock
* @returns {boolean}
*/
function isValidNewBlock(newBlock, previousBlock) {
let validatorReversed = config.validators;
/**
* Модули консенсусов изначально расположены в порядке повышения приоритета.
* Выбор консенсуса должен идти в порядке убывания приоритета
*/
validatorReversed.reverse();
try {
for (let a in validatorReversed) {
if(validatorReversed.hasOwnProperty(a)) {
if(validatorReversed[a].isValidNewBlock(newBlock, previousBlock)) {
validatorReversed.reverse();
return true;
}
}
}
} catch (e) {
validatorReversed.reverse();
throw e;
}
validatorReversed.reverse();
return false;
}
/**
* Подключаемся к пирам
* @param newPeers
*/
function connectToPeers(newPeers) {
let peers = getCurrentPeers();
if(peers.length >= config.maxPeers) {
return;
}
newPeers = newPeers.filter((v, i, a) => a.indexOf(v) === i);
newPeers.forEach((peer) => {
if(peers.indexOf(peer) !== -1) {
return;
}
try {
if(peersBlackList.indexOf(url.parse(peer).hostname) !== -1) {
return;
}
let ws = new WebSocket(peer, {perMessageDeflate: false});
ws.on('open', function () {
initConnection(ws);
});
ws.on('error', (error) => {
ws.close();
});
} catch (e) {
}
});
}
/**
* Получили новую цепочку блоков
* @param message
*/
function handleBlockchainResponse(message) {
//We can't handle new blockchain while sync in progress
if(blockHandler.syncInProgress) {
return;
}
//Now we process some chain
if(storj.get('chainResponseMutex')) {
return;
}
//Set block for new chain responses
storj.put('chainResponseMutex', true);
let receivedBlocks = JSON.parse(message.data);
if(receivedBlocks.length === 0 || receivedBlocks[0] === false) {
storj.put('chainResponseMutex', false);
return;
}
receivedBlocks = receivedBlocks.sort((b1, b2) => (b1.index - b2.index));
/**
* @type {Block}
*/
const latestBlockReceived = receivedBlocks[receivedBlocks.length - 1];
getLatestBlock(function (latestBlockHeld) {
if(!latestBlockHeld) {
if(config.program.autofix) {
maxBlock--;
logger.autofix('Reset blockchain height to ' + (maxBlock));
} else {
logger.error('Can\'t receive last block. Maybe database busy?');
}
storj.put('chainResponseMutex', false);
return;
}
try {
if(latestBlockReceived.timestamp > moment().utc().valueOf() + 60000) {
if(config.program.verbose) {
logger.error('Incorrect received block timestamp or local time ' + latestBlockReceived.timestamp + ' current ' + moment().utc().valueOf());
}
storj.put('chainResponseMutex', false);
return;
}
if(latestBlockReceived.index > latestBlockHeld.index || (blockHandler.keyring.length === 0 && latestBlockReceived.index < 5 && latestBlockReceived.index !== 0)) {
lastKnownBlock = latestBlockReceived.index;
if(receivedBlocks.length === 1) {
if(lastKnownBlock !== latestBlockReceived.index) {
logger.info('Synchronize: Recived last chain block ' + latestBlockReceived.index);
}
} else {
if(config.program.verbose) {
logger.info('Synchronize: Recived ' + latestBlockHeld.index + ' of ' + latestBlockReceived.index);
}
}
if(latestBlockHeld.hash === latestBlockReceived.previousHash && latestBlockHeld.index > 5) { //когда получен один блок от того который у нас есть
if(isValidChain(receivedBlocks) && (receivedBlocks[0].index <= maxBlock || receivedBlocks.length === 1)) {
addBlockToChain(latestBlockReceived, /*true*/ false); //Ранее была правка которая отключала синхронизацию этого блока. Хз зачем, пока убрал
responseLatestMsg(function (msg) {
storj.put('chainResponseMutex', false);
broadcast(msg);
});
}
} else if(receivedBlocks.length === 1) {
let getBlockFrom = latestBlockHeld.index - config.blockQualityCheck;
if(getBlockFrom < 0) {
getBlockFrom = maxBlock;
lastKnownBlock = maxBlock;
}
if(!blockHandler.syncInProgress) {
broadcast(queryAllMsg(getBlockFrom));
}
storj.put('chainResponseMutex', false);
} else {
if(receivedBlocks[0].index <= maxBlock && receivedBlocks.length > 1) {
replaceChain(receivedBlocks, function () {
storj.put('chainResponseMutex', false);
});
} else {
storj.put('chainResponseMutex', false);
}
}
} else {
//console.log('received blockchain is not longer than received blockchain. Do nothing');
storj.put('chainResponseMutex', false);
}
} catch (e) {
logger.info('Received chain corrupted error');
storj.put('chainResponseMutex', false);
}
});
}
let replaceChainTimer = null;
/**
* Производим замену цепочки на обновлённую
* @param {Block[]} newBlocks
* @param {function} cb
*/
function replaceChain(newBlocks, cb) {
let maxIndex = maxBlock - config.limitedConfidenceBlockZone;
if(maxIndex < 0) {
maxIndex = 0;
}
const validChain = isValidChain(newBlocks);
if(!(newBlocks[0].index >= maxIndex)) {//ограничение доверия принимаемой цепочки блоков
if(config.program.verbose) {
logger.error('LimitedConfidence: Invalid chain');
}
if(typeof cb !== 'undefined') {
cb();
}
return;
}
if(
validChain // && newBlocks[0].index >= maxIndex
/*&& newBlocks.length >= maxBlock*/
) {
//console.log(newBlocks);
//logger.info('Received blockchain is valid.');
logger.info('Synchronize: ' + newBlocks[0].index + ' of ' + newBlocks[newBlocks.length - 1].index);
Sync(function () {
for (let i of newBlocks) {
addBlockToChainIndex.sync(null, i.index, i, true);
}
responseLatestMsg(function (msg) {
broadcast(msg);
});
clearTimeout(replaceChainTimer);
replaceChainTimer = setTimeout(function () {
//If receiving chain, no syncing
if(storj.get('chainResponseMutex')) {
return;
}
blockHandler.resync();
}, config.peerExchangeInterval + 2000);
if(typeof cb !== 'undefined') {
cb();
}
});
} else {
if(typeof cb !== 'undefined') {
cb();
}
logger.error('Received blockchain corrupted');
}
}
/**
* Проверяет корректность цепочки
* @param {Array} blockchainToValidate
* @returns {boolean}
*/
function isValidChain(blockchainToValidate) {
/*if(JSON.stringify(blockchainToValidate[0]) !== JSON.stringify(getGenesisBlock())) {
return false;
}*/
try {
const tempBlocks = [blockchainToValidate[0]];
for (let i = 1; i < blockchainToValidate.length; i++) {
if(isValidNewBlock(blockchainToValidate[i], tempBlocks[i - 1])) {
try {
tempBlocks.push(blockchainToValidate[i]);
} catch (e) {
console.log(e);
return false;
}
} else {
return false;
}
}
} catch (e) {
console.log(e);
return false;
}
return true;
}
/**
* Получаем последний загруженный блок цепочки
* @param callback
*/
function getLatestBlock(callback) {
blockchain.get(maxBlock, function (err, val) {
if(!err) {
callback(JSON.parse(val));
} else {
callback(false);
}
});
}
/**
* Запрос последнего блока цепочки
* @returns {{type: number}}
*/
function queryChainLengthMsg() {
return {'type': MessageType.QUERY_LATEST}
}
/**
* Запрос всех блоков цепочки
* @returns {{type: number}}