-
Notifications
You must be signed in to change notification settings - Fork 0
/
zmq_tx_wesocket_fastify.js
executable file
·153 lines (134 loc) · 4.28 KB
/
zmq_tx_wesocket_fastify.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
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
/**
* Copyright 2024 github.com/st3b1t license: GPL3
* requirements:
* on bitcoin.conf enable this line:
* zmqpubrawtx=tcp://127.0.0.1:28332
*/
const util = require('util');
const exec = util.promisify(require('child_process').exec);
const zmq = require('zeromq'); //https://zeromq.github.io/zeromq.js/
const bitcoin = require('bitcoinjs-lib');
const logger = false;
const fastify = require('fastify')({logger});
const fastifyWs = require('@fastify/websocket');
const EventEmitter = require('node:events');
const eventEmitter = new EventEmitter();
//configurations
const USE_CLI = process.argv[2] === '--bitcoin-tx-cli'; //use bitcoin-tx command
const {HOST='127.0.0.1', PORT=28332} = process.env;
const zmqaddress = `tcp://${HOST}:${PORT}`
const zmqsub = 'rawtx'
const port = 8080; //listen port for browser
function hexToUtf8(hex) {
return Buffer.from(hex,'hex').toString('utf8');
}
const classifyOutputScript = output => {
const isOutput = paymentFn => {
try {
return paymentFn({output})
} catch (e) {}
}
if (isOutput(bitcoin.payments.p2pk)) return 'pubkey'
else if (isOutput(bitcoin.payments.p2pkh)) return 'pubkeyhash'
else if (isOutput(bitcoin.payments.p2ms)) return 'multisig'
else if (isOutput(bitcoin.payments.p2wpkh)) return 'witnesspubkeyhash'
else if (isOutput(bitcoin.payments.p2sh)) return 'scripthash'
else if (isOutput(bitcoin.payments.embed)) return 'nulldata'
return 'nonstandard'
}
async function decodeTx(rawTx) {
const tx = bitcoin.Transaction.fromBuffer(rawTx);
return {
txid: tx.getId(),
version: tx.version,
locktime: tx.locktime,
vin: tx.ins.map(input => ({
txid: Buffer.from(input.hash).reverse().toString('hex'),
vout: input.index,
scriptSig: input.script.toString('hex'),
sequence: input.sequence,
})),
vout: tx.outs.map((output, index) => ({
value: output.value / 1e8, // converti satoshi in bitcoin
n: index,
scriptPubKey: {
asm: bitcoin.script.toASM(output.script),
hex: output.script.toString('hex'),
type: classifyOutputScript(output.script)
}
}))
};
}
async function decodeTxCli(tx) {
const hexTx = tx.toString('hex');
const {stdout, stderr} = await exec(`bitcoin-tx -json ${hexTx}`)
return JSON.parse(stdout.toString('utf8'));
}
//use bitcoinjs-lib or bitcoin-tx
const decodeRawTx = USE_CLI ? decodeTxCli : decodeTx;
console.log('Use:', USE_CLI ? 'bitcoin-tx' : 'bitcoinjs-lib' , 'to decode TXs')
fastify.register(fastifyWs);
fastify.register(async function (fastify) {
fastify.get('/stream', { websocket: true }, (sockws, req) => {
eventEmitter.on('tx', msg => {
sockws.send(msg);
});
});
});
//homepage
fastify.get('/', (req, res) => {
res.type('text/html').send(`
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
</head>
<body>
<textarea rows="20" cols="120"></textarea>
<script>
const ws = new WebSocket('ws://' + location.host + '/stream')
, texta = document.getElementsByTagName('textarea')[0];
ws.onmessage = function(e) {
texta.value += e.data;
texta.scrollTop = texta.scrollHeight;
};
</script>
</body>
</html>
`);
});
const main = async () => {
const TT = {}
const sockz = zmq.socket('sub');
console.log(`ZMQ Connect: ${zmqaddress} Subscribe: ${zmqsub}...`);
sockz
.on('connected', function() {
console.log('ZMQ connected:', arguments)
})
.on('error', async err => {
console.log('ZMQ error', err)
})
.connect(zmqaddress)
.subscribe(zmqsub)
.on('message', async (topic, message) => {
const rawTx = await decodeRawTx(message);
rawTx.vout.forEach(vout => {
const {type} = vout.scriptPubKey
, hex = hexToUtf8(vout.scriptPubKey.hex)
TT[type] = TT[type] ? TT[type]+1 : 1;
//if (type === 'nulldata') { //only op_return timstamps
const msg = `TX: ${rawTx.txid}:${vout.n} TYPE: ${type}\nOP_RETURN: ${hex}\n`
console.log(msg)
eventEmitter.emit('tx', msg)
//}
});
});
process.on('SIGINT', () => {
sockz.close();
fastify.close()
process.exit(0);
});
console.log(`Open Browser on http://localhost:${port}`)
await fastify.listen({port});
};
main();