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const axios = require("axios");
const reverse = require("buffer-reverse");
const zmq = require("zeromq");
const { Op } = require("sequelize");
const bitcoin = require("elementsjs-lib");
const zmqRawBlock = zmq.socket("sub");
zmqRawBlock.connect(config.liquid.zmqrawblock);
zmqRawBlock.subscribe("rawblock");
const zmqRawTx = zmq.socket("sub");
zmqRawTx.connect("tcp://127.0.0.1:18603");
zmqRawTx.subscribe("rawtx");
zmqRawTx.on("message", async (topic, message, sequence) => {
const hex = message.toString("hex");
const unblinded = await lq.unblindRawTransaction(hex);
const tx = await lq.decodeRawTransaction(unblinded.hex);
const blinded = await lq.decodeRawTransaction(hex);
if (payments.includes(blinded.txid)) return;
Promise.all(
tx.vout.map(async o => {
if (!(o.scriptPubKey && o.scriptPubKey.addresses)) return;
const { asset } = o;
const value = toSats(o.value);
const address = o.scriptPubKey.addresses[0];
if (Object.keys(addresses).includes(address)) {
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 = 0;
const params = {
user_id: user.id,
asset,
};
const account = await db.Account.findOne({
where: params
});
if (account) {
account.pending += value;
await account.save();
} else {
let assets = await axios.get("https://assets.blockstream.info/");
let { ticker, precision, name } = assets[asset];
params = { ...params, ...{ticker, precision, name }};
params.balance = 0;
params.pending = value;
account = await db.Account.create(params);
}
user.confidential = await lq.getNewAddress();
user.liquid = (await lq.getAddressInfo(
user.confidential
)).unconfidential;
await user.save();
emit(user.username, "user", user);
addresses[user.liquid] = user.username;
const payment = await db.Payment.create({
account_id: account.id,
user_id: user.id,
hash: blinded.txid,
amount: value - tip,
currency,
rate,
received: true,
tip,
confirmed,
address,
asset
});
payments.push(blinded.txid);
l.info("liquid detected", user.username, asset, value);
emit(user.username, "payment", payment);
}
})
);
});
let queue = {};
zmqRawBlock.on("message", async (topic, message, sequence) => {
const payments = await db.Payment.findAll({
where: { confirmed: 0 }
});
const hashes = payments.map(p => p.hash);
const block = bitcoin.Block.fromHex(message.toString("hex"), true);
const hash = await lq.getBlockHash(block.height);
const json = await lq.getBlock(hash, 2);
json.tx.map(tx => {
if (hashes.includes(tx.txid)) queue[tx.txid] = 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, received: 1 }
include: {
model: db.Account,
as: "account",
},
});
p.confirmed = 1;
l.info("account", p.account);
p.account.balance += p.amount + p.tip;
p.account.pending -= Math.min(p.account.pending, p.amount + p.tip);
await p.account.save();
l.info("liquid confirmed", user.username, p.asset, p.amount, p.tip);
await p.save();
user = await getUser(user.username);
emit(user.username, "user", user);
delete queue[hash];
}
}, 1000);
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