import ExchangeSocketApi from './api/exchangeSocketApi';
const exchangeSocketApi = new ExchangeSocketApi();

tradingPairs = ['BTC-ETH','BTC-DASH', 'BTC-LTC']

exchangeSocketApi.listenDataFromExchanges(tradingPairs, (data) => {
  console.log('All Exchange data', data);
});
//returns
{
  'BTC-LTC': {
    'All_Prices': {
      Bitfinex: 0.018955,
      Bittrex: 0.01895222,
      Poloniex: '0.01893073',
    },  
    Best_Price: { Exchange: 'Poloniex', Price: 0.01893073 }
  },
  'BTC-ETH':{
    'All_Prices': {
      Bitfinex: 0.081817,
      Bittrex: 0.0822603,
      Poloniex: '0.08176915',
    },
    Best_Price: { Exchange: 'Poloniex', Price: 0.08176915 }
  },
  'BTC-DASH':{
    'All_Prices': {
      Bitfinex: 0.069946,
      Bittrex: 0.06990888,
      Poloniex: '0.06973162',
    },
    Best_Price: { Exchange: 'Poloniex', Price: 0.06973162 }
   }
}

exchangeSocketApi.subscribeToBitfinex(tradingPairs, (data) => {
  console.log('Bitfinex data', data);
});
//returns
{ exchange: 'Bitfinex', pair: 'LTCBTC', price: 0.018952 }

exchangeSocketApi.subscribeToPoloniex(tradingPairs, (data) => {
  console.log('Poloniex data', data);
});
//returns
{ exchange: 'Poloniex', pair: 'LTCBTC', price: 0.018952 }

exchangeSocketApi.subscribeToBittrex(tradingPairs, (data) => {
  console.log('Bittrex data', data);
});
//returns
{ exchange: 'Bittrex', pair: 'LTCBTC', price: 0.018952 }