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();