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const reverse = require("buffer-reverse");
const zmq = require("zeromq");
const { Op } = require("sequelize");
const bitcoin = require("bitcoinjs-lib");
const zmqRawBlock = zmq.socket("sub");
zmqRawBlock.connect(config.bitcoin.zmqrawblock);
zmqRawBlock.subscribe("rawblock");
const zmqRawTx = zmq.socket("sub");
zmqRawTx.connect(config.bitcoin.zmqrawtx);
zmqRawTx.subscribe("rawtx");
const asset = "BTC";
const network =
bitcoin.networks[
config.bitcoin.network === "mainnet" ? "bitcoin" : config.bitcoin.network
];
zmqRawTx.on("message", async (topic, message, sequence) => {
const hex = message.toString("hex");
let tx = bitcoin.Transaction.fromHex(message);
let hash = reverse(tx.getHash()).toString("hex");
if (payments.includes(hash)) return;
Promise.all(
tx.outs.map(async o => {
const { value } = o;
let address;
try {
address = bitcoin.address.fromOutputScript(o.script, network);
} catch (e) {
return;
}
if (Object.keys(addresses).includes(address)) {
payments.push(hash);
let user = await db.User.findOne({
where: {
username: addresses[address]
}
});
const invoice = await db.Invoice.findOne({
where: {
user_id: user.id,
asset
},
order: [["id", "DESC"]]
});
const currency = invoice ? invoice.currency : user.currency;
const rate = invoice ? invoice.rate : app.get("rates")[user.currency];
const tip = invoice ? invoice.tip : null;
let confirmed = false;
user.address = await bc.getNewAddress("", "bech32");
user.pending += value;
await user.save();
emit(user.username, "user", user);
addresses[user.address] = user.username;
const payment = await db.Payment.create({
user_id: user.id,
hash,
amount: value - tip,
currency,
rate,
received: true,
tip,
confirmed,
address,
asset,
});
l.info("bitcoin detected", user.username, o.value);
emit(user.username, "payment", payment);
}
})
);
});
let queue = {};
zmqRawBlock.on("message", async (topic, message, sequence) => {
const payments = await db.Payment.findAll({
where: { confirmed: false }
});
const hashes = payments.map(p => p.hash);
let block = bitcoin.Block.fromHex(message.toString("hex"));
block.transactions.map(tx => {
let hash = reverse(tx.getHash()).toString("hex");
if (hashes.includes(hash)) queue[hash] = 1;
});
});
setInterval(async () => {
let arr = Object.keys(queue);
for (let i = 0; i < arr.length; i++) {
let hash = arr[i];
let p = await db.Payment.findOne({
where: { hash, confirmed: 0 }
});
p.confirmed = 1;
const user = await getUserById(p.user_id);
user.balance += p.amount + p.tip;
user.pending -= Math.min(user.pending, p.amount + p.tip);
emit(user.username, "user", user);
await user.save();
await p.save();
let payments = await db.Payment.findAll({
where: {
user_id: user.id,
received: {
[Op.ne]: null
}
},
order: [["id", "DESC"]],
limit: 12
});
l.info("bitcoin confirmed", user.username, p.amount, p.tip);
emit(user.username, "payments", payments);
delete queue[hash];
}
}, 1000);
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