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 ();