Get account balances in XRP for Ripple Trade competition

leaderboard.js

var fs       = require('fs');
var Remote   = require('ripple-lib').Remote;

var remote = new Remote({
  trusted:        true,
  local_signing:  true,
  local_fee:      true,
  fee_cushion:     1.5, 
  servers: [
    {
        host:    's1.ripple.com'
      , port:    443
      , secure:  true
    }
  ]
});

var currencies = new Array();

function sortTraders(a, b) {
  return b.balance - a.balance;
}

function updateLeaderboard() {
  traders.sort(sortTraders);
  console.log(traders);
}

function ConvertCurrencyToXrp(trader, currency, issuer, balance) {
  if (!currencies.hasOwnProperty(currency)) {
    currencies[currency] = new Array();
  }
  if (currencies[currency].hasOwnProperty(issuer)) {
    trader.balance += currencies[currency][issuer];
  } else {
    // console.log('currency: ', currency);
    // console.log('issuer:', issuer);
    remote.requestBookOffers({
      'currency':currency,
      'issuer':  issuer
    }, {
      'currency':'XRP'
    }, function(err, res) {
      if (err) {
        console.log(err);
      } else {
        if (!res.hasOwnProperty('offers') || !res.offers.length || !res.offers[0].hasOwnProperty('quality')) {
          console.log(trader);
          console.log(res);
          console.log(currency + issuer);
          return;
        }
        var price = parseFloat(res.offers[0].quality)/1000000;
        currencies[currency][issuer] = price;
        trader.balance += balance * price;
        updateLeaderboard();
      }
    });
  }
}

function GetAccountBalance(trader) {
  trader.balance=0;
  remote.requestAccountInfo(trader.address, function(err, res){
    if (err) {
      console.log(err.remote.error);
      if (err.remote.error==='tooBusy') {}
    } else {
      trader.balance += parseInt(res.account_data.Balance)/1000000;
      updateLeaderboard();
    }
  });

  remote.requestAccountLines(trader.address, function(err, res){
    if (err) {
      console.log(err);
    } else {
      for (var i=0; i<res.lines.length; i++) {
        var balance = parseFloat(res.lines[i].balance);
        if (balance>0) {
          ConvertCurrencyToXrp(trader, res.lines[i].currency,
                               res.lines[i].account,
                               parseFloat(res.lines[i].balance));        
        }
      }
    }
  });
}

var traders;
remote.connect(function() {
  var file = fs.readFileSync('traders.json');
  traders = JSON.parse(file);
  for (var i=0; i<traders.length; i++) {
    GetAccountBalance(traders[i]);
  }
});