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 ();