Shared Load Markets

// @NO_AUTO_TRANSPILE
import ccxt from '../../js/ccxt.js';
// ----------------------------------------------------------------------------
// an example of how to load markets for each exchange just once
// in order to save memory and time for initializing multiple exchange instances
// see https://github.com/ccxt/ccxt/issues/7312 for details
// ----------------------------------------------------------------------------
const globalIds = ['binance', 'poloniex', 'kucoin', 'bitstamp'];
const globalExchanges = {};
async function loadExchange(id) {
    try {
        const exchange = new ccxt[id]();
        await exchange.loadMarkets();
        globalExchanges[id] = exchange;
    }
    catch (e) {
        // throw e // uncomment to break the entire program on any error
        // console.log (e) // print the exception and ignore this exchange
    }
}
async function main() {
    // initialize unique global exchange instances first
    await Promise.all(globalIds.map(async (id) => loadExchange(id)));
    console.log('Loaded global exchanges:', Object.keys(globalExchanges));
    // load user exchanges and keys from a database or configure these via JSON
    const users = {
        'user1': {
            'binance': { 'apiKey': 'USER1_BINANCE_API_KEY', 'secret': 'USER1_BINANCE_SECRET' },
            'poloniex': { 'apiKey': 'USER1_POLONIEX_API_KEY', 'secret': 'USER1_POLONIEX_SECRET' }
        },
        'user2': {
            'poloniex': { 'apiKey': 'USER2_POLONIEX_API_KEY', 'secret': 'USER2_POLONIEX_SECRET' },
            'kucoin': { 'apiKey': 'USER2_kucoin_API_KEY', 'secret': 'USER2_kucoin_SECRET' }
        },
        'user3': {
            'kucoin': { 'apiKey': 'USER3_kucoin_API_KEY', 'secret': 'USER3_kucoin_SECRET' },
            'bitstamp': { 'apiKey': 'USER3_BITSTAMP_API_KEY', 'secret': 'USER3_BITSTAMP_SECRET' }
        }
    };
    // initialize local exchanges per user
    const localExchanges = {};
    for (const userId in users) {
        const userExchanges = {};
        for (const exchangeId in users[userId]) {
            if (exchangeId in globalExchanges) {
                const globalExchange = globalExchanges[exchangeId];
                const exchange = new ccxt[exchangeId]({
                    // 'verbose': true, // uncomment for debug output
                    ...users[userId][exchangeId],
                });
                [
                    'ids',
                    'markets',
                    'markets_by_id',
                    'currencies',
                    'currencies_by_id',
                    'baseCurrencies',
                    'quoteCurrencies',
                    'symbols',
                ].forEach((propertyName) => {
                    exchange[propertyName] = globalExchange[propertyName];
                });
                userExchanges[exchangeId] = exchange;
            }
        }
        localExchanges[userId] = userExchanges;
    }
    // print the loaded exchanges per user
    for (const userId in localExchanges) {
        console.log('Loaded', userId, Object.keys(localExchanges[userId]));
    }
}
main();