Load All Symbols At Once

import ccxt from '../../js/ccxt.js';
import asTable from 'as-table';
import ololog from 'ololog';
import ansicolor from 'ansicolor';
const log       = ololog.configure ({ locate: false })

ansicolor.nice

//-----------------------------------------------------------------------------

process.on ('uncaughtException',  e => { log.bright.red.error (e); process.exit (1) })
process.on ('unhandledRejection', e => { log.bright.red.error (e); process.exit (1) })

//-----------------------------------------------------------------------------

let test = async function (exchange) {

    try {

        await exchange.loadMarkets ()
        log (exchange.id.green, 'loaded', exchange.symbols.length.toString ().bright.green, 'symbols')

    } catch (e) {

        if (e instanceof ccxt.DDoSProtection) {
            log.bright.yellow (exchange.id, '[DDoS Protection] ' + e.message)
        } else if (e instanceof ccxt.RequestTimeout) {
            log.bright.yellow (exchange.id, '[Request Timeout] ' + e.message)
        } else if (e instanceof ccxt.AuthenticationError) {
            log.bright.yellow (exchange.id, '[Authentication Error] ' + e.message)
        } else if (e instanceof ccxt.ExchangeNotAvailable) {
            log.bright.yellow (exchange.id, '[Exchange Not Available] ' + e.message)
        } else if (e instanceof ccxt.ExchangeError) {
            log.bright.yellow (exchange.id, '[Exchange Error] ' + e.message)
        } else if (e instanceof ccxt.NetworkError) {
            log.bright.yellow (exchange.id, '[Network Error] ' + e.message)
        } else {
            throw e
        }
    }
}

//-----------------------------------------------------------------------------

let exchanges = []

async function main () {

    // instantiate all exchanges
    await Promise.all (ccxt.exchanges.map (async id => {
        let exchange = new (ccxt)[id] ()
        exchanges.push (exchange)
        await test (exchange)
    }))

    let succeeded = exchanges.filter (exchange => exchange.markets ? true : false).length.toString ().bright.green
    let failed = exchanges.filter (exchange => exchange.markets ? false : true).length
    let total = ccxt.exchanges.length.toString ().bright.white
    let numSymbols = 0;
    exchanges.map (exchange => {
        numSymbols += exchange.symbols ? exchange.symbols.length : 0;
    })
    log (numSymbols, 'symbols from', succeeded, 'of', total, 'exchanges loaded', ('(' + failed + ' errors)').red)

}

main ()