Watch Fetch Many Exchanges Many Ordersbooks

'use strict';

import ccxt from '../../js/ccxt.js';

console.log ('CCXT Version:', ccxt.version); // eslint-disable-line import/no-named-as-default-member

async function watchOrderBook (exchange, symbol) {
    while (true) { // eslint-disable-line no-constant-condition
        try {
            const method = exchange.has.watchOrderBook ? 'watchOrderBook' : 'fetchOrderBook';
            const orderbook = await exchange[method] (symbol);
            console.log (new Date (), exchange.id, symbol, orderbook['asks'][0], orderbook['bids'][0]);
        } catch (e) {
            console.log (symbol, e);
            process.exit ();
        }
    }
}

async function watchExchange (exchangeId, symbols) {
    const exchange = new ccxt.pro[exchangeId] (); // eslint-disable-line import/no-named-as-default-member
    await exchange.loadMarkets ();
    await Promise.all (symbols.map ((symbol) => watchOrderBook (exchange, symbol)));
}

async function main () {
    const streams = {
        'okx': [
            'BTC/USDT',
            'ETH/BTC',
        ],
        'coinex': [
            'BTC/USDT',
            'ETH/BTC',
        ],
    };

    const entries = Object.entries (streams);
    await Promise.all (entries.map (([ exchangeId, symbols ]) => watchExchange (exchangeId, symbols)));
}

main ();