/
index.js
76 lines (56 loc) · 1.83 KB
/
index.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
const bodyParser = require('body-parser');
const express = require('express');
const request = require('request');
const Blockchain = require('./blockchain');
const PubSub = require('./app/pubsub');
const TransactionPool = require('./wallet/transaction-pool');
const Wallet = require('./wallet');
const app = express();
const blockchain = new Blockchain();
const transactionPool = new TransactionPool();
const wallet = new Wallet();
const pubsub = new PubSub({ blockchain });
const DEFAULT_PORT = 3000;
const ROOT_NODE_ADDRESS = `http://localhost:${DEFAULT_PORT}`;
app.use(bodyParser.json());
app.get('/api/blocks', (req, res) => {
res.json(blockchain.chain);
});
app.post('/api/mine', (req, res) => {
const { data } = req.body;
blockchain.addBlock({ data });
pubsub.broadcastChain();
res.redirect('/api/blocks');
});
app.post('/api/transact', (req, res) => {
const { amount, recipient } = req.body;
let transaction;
try {
wallet.createTransaction({ recipient, amount });
} catch(error) {
return res.status(400).json({ type: 'error', message: error.message });
}
transactionPool.setTransaction(transaction);
console.log('transactionPool', transactionPool);
res.json({ type: 'success', transaction });
});
const syncChains = () => {
request({ url: `${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);
}
});
};
let PEER_PORT;
if (process.env.GENERATE_PEER_PORT === 'true') {
PEER_PORT = DEFAULT_PORT + Math.ceil(Math.random() * 1000);
}
const PORT = PEER_PORT || DEFAULT_PORT;
app.listen(PORT, () => {
console.log(`listening at localhost:${PORT}`);
if (PORT !== DEFAULT_PORT) {
syncChains();
}
});