graceful shutdown

'use strict';
import ccxt from '../../js/ccxt.js';
console.log('CCXT Version:', ccxt.version); // eslint-disable-line import/no-named-as-default-member
let stop = false;
async function shutdown(milliseconds) {
    await ccxt.sleep(milliseconds);
    stop = true;
}
async function watchOrderBook(exchangeId, symbol) {
    const exchange = new ccxt.pro[exchangeId](); // eslint-disable-line import/no-named-as-default-member
    await exchange.loadMarkets();
    // exchange.verbose = true
    while (!stop) {
        try {
            const orderbook = await exchange.watchOrderBook(symbol);
            console.log(new Date(), exchange.id, symbol, orderbook['asks'][0], orderbook['bids'][0]);
        }
        catch (e) {
            console.log(symbol, e);
            stop = true;
            break;
        }
    }
    await exchange.close();
}
async function main() {
    const streams = {
        'binance': 'BTC/USDT',
        'okx': 'BTC/USDT',
    };
    await Promise.all([
        shutdown(10000),
        ...Object.entries(streams).map(([exchangeId, symbol]) => watchOrderBook(exchangeId, symbol)),
    ]);
}
main();