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index.js
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index.js
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const bodyParser = require('body-parser');
const express = require('express');
const request = require('request');
const path = require('path');
const Blockchain = require('./blockchain');
const PubSub = require('./app/pubsub');
const TransactionPool = require('./wallet/transaction-pool');
const Wallet = require('./wallet');
const TransactionMiner = require('./app/transaction-miner');
const isDevelopment = process.env.ENV === 'development';
const REDIS_URL = isDevelopment ?
'redis://127.0.0.1:6379' :
'redis://h:p05f9a274bd0e2414e52cb9516f8cbcead154d7d61502d32d9750180836a7cc05@ec2-34-225-229-4.compute-1.amazonaws.com:19289'
const DEFAULT_PORT = 3000;
const ROOT_NODE_ADDRESS = `http://localhost:${DEFAULT_PORT}`;
const app = express();
const blockchain = new Blockchain();
const transactionPool = new TransactionPool();
const wallet = new Wallet();
const pubsub = new PubSub({ blockchain, transactionPool, redisUrl: REDIS_URL });
// const pubsub = new PubSub({ blockchain, transactionPool, wallet }); // for PubNub
const transactionMiner = new TransactionMiner({ blockchain, transactionPool, wallet, pubsub });
app.use(bodyParser.json());
app.use(express.static(path.join(__dirname, 'client/dist')));
app.get('/api/blocks', (req, res) => {
res.json(blockchain.chain);
});
app.get('/api/blocks/length', (req, res) => {
res.json(blockchain.chain.length);
});
app.get('/api/blocks/:id', (req, res) => {
const { id } = req.params;
const { length } = blockchain.chain;
const blocksReversed = blockchain.chain.slice().reverse();
let startIndex = (id-1) * 5;
let endIndex = id * 5;
startIndex = startIndex < length ? startIndex : length;
endIndex = endIndex < length ? endIndex : length;
res.json(blocksReversed.slice(startIndex, endIndex));
});
app.post('/api/mine', (req, res) => {
const { data } = req.body;
blockchain.addBlock({ data });
pubsub.broadcastChain();
res.redirect('/api/blocks');
});
app.post('/api/transact', (req, res) => {
const { amount, recipient } = req.body;
let transaction = transactionPool
.existingTransaction({ inputAddress: wallet.publicKey });
try {
if (transaction) {
transaction.update({ senderWallet: wallet, recipient, amount });
} else {
transaction = wallet.createTransaction({
recipient,
amount,
chain: blockchain.chain
});
}
} catch(error) {
return res.status(400).json({ type: 'error', message: error.message });
}
transactionPool.setTransaction(transaction);
pubsub.broadcastTransaction(transaction);
res.json({ type: 'success', transaction });
});
app.get('/api/transaction-pool-map', (req, res) => {
res.json(transactionPool.transactionMap);
});
app.get('/api/mine-transactions', (req, res) => {
transactionMiner.mineTransactions();
res.redirect('/api/blocks');
});
app.get('/api/wallet-info', (req, res) => {
const address = wallet.publicKey;
res.json({
address,
balance: Wallet.calculateBalance({ chain: blockchain.chain, address })
});
});
app.get('/api/known-addresses', (req, res) => {
const addressMap = {};
for (let block of blockchain.chain) {
for (let transaction of block.data) {
const recipient = Object.keys(transaction.outputMap);
recipient.forEach(recipient => addressMap[recipient] = recipient);
}
}
res.json(Object.keys(addressMap));
});
app.get('*', (req, res) => {
res.sendFile(path.join(__dirname, 'client/dist/index.html'));
});
const syncWithRootState = () => {
request({ url: `${ROOT_NODE_ADDRESS}/api/blocks` }, (error, response, body) => {
if (!error && response.statusCode === 200) {
const rootChain = JSON.parse(body);
console.log('replace chain on a sync with', rootChain);
blockchain.replaceChain(rootChain);
}
});
request({ url: `${ROOT_NODE_ADDRESS}/api/transaction-pool-map` }, (error, response, body) => {
if (!error && response.statusCode === 200) {
const rootTransactionPoolMap = JSON.parse(body);
console.log('replace transaction pool map on a sync with', rootTransactionPoolMap);
transactionPool.setMap(rootTransactionPoolMap);
}
});
};
if (isDevelopment) {
const walletFoo = new Wallet();
const walletBar = new Wallet();
const generateWalletTransaction = ({ wallet, recipient, amount }) => {
const transaction = wallet.createTransaction({
recipient, amount, chain: blockchain.chain
});
transactionPool.setTransaction(transaction);
};
const walletAction = () => generateWalletTransaction({
wallet, recipient: walletFoo.publicKey, amount: 5
});
const walletFooAction = () => generateWalletTransaction({
wallet: walletFoo, recipient: walletBar.publicKey, amount: 10
});
const walletBarAction = () => generateWalletTransaction({
wallet: walletBar, recipient: wallet.publicKey, amount: 15
});
for (let i=0; i<20; i++) {
if (i%3 === 0) {
walletAction();
walletFooAction();
} else if (i%3 === 1) {
walletAction();
walletBarAction();
} else {
walletFooAction();
walletBarAction();
}
transactionMiner.mineTransactions();
}
}
let PEER_PORT;
if (process.env.GENERATE_PEER_PORT === 'true') {
PEER_PORT = DEFAULT_PORT + Math.ceil(Math.random() * 1000);
}
const PORT = process.env.PORT || PEER_PORT || DEFAULT_PORT;
app.listen(PORT, () => {
console.log(`listening at localhost:${PORT}`);
if (PORT !== DEFAULT_PORT) {
syncWithRootState();
}
});