exchange rates part

exchangeRates.js

async function get(params) {
  const today = new Date().toISOString().split('T')[0];
  const {fromCurrency='AUD', toCurrency='USD', onDate=today} = params;

  let exchangeRates = await db.query(
    `SELECT rate, created_at FROM exchange_rates WHERE from_currency = ? AND to_currency = ? AND on_date = ?`, 
    [fromCurrency, toCurrency, onDate]
  );
    
  if (exchangeRates.length) {
    const rate = Number(exchangeRates[0].rate);
    console.log(`Found exchange rate of ${rate} for ${fromCurrency} to ${toCurrency} of ${onDate} in the db`);
    return {fromCurrency, toCurrency, onDate, rate};
  }
  
  return getExternal(fromCurrency, toCurrency, onDate);
}

module.exports = {
  get
}