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 ()