token sale ES5 UI scripting serverless loading data from infura or backup

fetch-stats.js

(function () {
  'use strict';
  var RPC = 'https://mainnet.infura.io/aR7WPNCrZhhnYRnn8yRT';
  RPC = 'http://159.203.127.98:9176';
  var saleAddress = '0x0d845706DdC11f181303a80828219c714ceb3687';
  var dvipAddress = '0xadc46ff5434910bd17b24ffb429e585223287d7f';
  var beneficiaryAddress = '0x532cc8b8AA6d61Da69c17E7C6197B0e43862a468';
  var auraPerDvip = '50000';
  var totalSaleDvip = '1600';
  var pollInterval = 10000;
  var figureDecimals = 2;
  var lodash = _;
  
  var bindKey = lodash.bindKey;
  var promisify = Promise.promisify;
  var noop = lodash.noop;
  var BN = BigNumber;
  BN.config({
    DECIMAL_PLACES: 100,
    ERRORS: false
  });
  var RPC = 'https://mainnet.infura.io/aR7WPNCrZhhnYRnn8yRT';
  RPC = 'http://159.203.127.98:9176';
  var web3 = new Web3(new Web3.providers.HttpProvider(RPC));
  var call = promisify(bindKey(web3.eth, 'call'));
  var encodeFunctionCall = bindKey(web3.eth.abi, 'encodeFunctionCall');
  var getBlockNumber = promisify(bindKey(web3.eth, 'getBlockNumber'));
  var getBalance = promisify(bindKey(web3.eth, 'getBalance'));
  var map = Promise.map;
  var mapSeries = Promise.mapSeries;

  var blockSubscribers = [];

  function subscribeToBlock(fn) {
    blockSubscribers.push(fn);
    return function () {
      blockSubscribers = blockSubscribers.filter(function (v) {
        return v !== fn;
      });
    };
  }

  function timeout(n) {
    return new Promise(function (resolve, reject) {
       setTimeout(resolve, n);
    });
  }

  subscribeToBlock(function () {
    call({
      to: saleAddress,
      data: encodeFunctionCall({
        name: 'price',
        inputs: []
      }, [])
    }).then(function (price) {
      var pricePerDvip = new BN(price).div(new BN(10).pow(10)).toPrecision();
      var dvipPerEth = new BN(1).div(pricePerDvip).toPrecision();
      var auraPerEth = new BN(dvipPerEth).mul(auraPerDvip).toPrecision();
      var pricePerDvipRounded = new BN(pricePerDvip).mul(new BN(10).pow(figureDecimals)).floor().div(new BN(10).pow(figureDecimals)).toPrecision();
      var dvipPerEthRounded = new BN(dvipPerEth).mul(new BN(10).pow(figureDecimals)).floor().div(new BN(10).pow(figureDecimals)).toPrecision();
      var auraPerEthRounded = new BN(auraPerEth).mul(new BN(10).pow(figureDecimals)).floor().div(new BN(10).pow(figureDecimals)).toPrecision();
      // do something with rounded values
      $('#price-per-dvip').html(pricePerDvipRounded + " ETH per DVIP");
      $('#dvip-per-eth').html(dvipPerEthRounded);
      $('#aura-per-eth').html(auraPerEthRounded);

      console.log(pricePerDvipRounded);
    });
  });

  subscribeToBlock(function () {
    call({
      to: dvipAddress,
      data: encodeFunctionCall({
        name: 'balanceOf',
        inputs: [{
          type: 'address',
          name: 'owner'
        }]
      }, [ saleAddress ])
    }).then(function (amount) {
      var amountString = new BN(new BN(totalSaleDvip).mul(new BN(10).pow(8))).minus(new BN(amount)).div(new BN(10).pow(8 - figureDecimals)).floor().div(new BN(10).pow(figureDecimals)).toPrecision();
      $('.figures').children().eq(0).text(amountString + ' DVIP Sold');
      $('.figures').children().eq(1).text(new BN(totalSaleDvip).minus(amountString).toPrecision() + ' DVIP Left');
      var percentComplete = new BN(amountString).div(totalSaleDvip).mul(10000).floor().div(100).toPrecision();
      var percentCompleteAdjusted = new BN(percentComplete).mul(0.99-0.21).add('21').toPrecision();
      var percentCompleteAdjustedProgress = new BN(percentComplete).mul(1-0.20).add('20').toPrecision();
      var auraGivenString = new BN(auraPerDvip).mul(amountString).toPrecision();
      $('.figures').children().eq(2).text(auraGivenString + ' AURA Given');

      $('.progress-bar--002').eq(0).css({
        width: percentCompleteAdjusted + '%'
      });
      $('#progress-percent').text(percentCompleteAdjustedProgress + '%');
      // After the green bar has grown enough move the text into the bar
      if (percentCompleteAdjusted > 33) {
          $('.progress-bar--002').removeClass('pivot');
      }
    });
  });

  subscribeToBlock(function () {
    getBalance(beneficiaryAddress).then(function (balance) {
      var eth = new BN(balance).div(new BN(10).pow(18 - figureDecimals)).floor().div(new BN(10).pow(figureDecimals)).toPrecision();
      $('.figures').children().eq(3).text(eth + ' ETH Raised');
    });
  });

  (function startPollingBlocks() {
    var block = 0;
    (function pollOne() {
      function next() {
        return timeout(pollInterval).then(pollOne);
      }
      return getBlockNumber().then((number) => {
        if (number !== block) {
          block = number;
          blockSubscribers.forEach(function (v) {
            v(number);
          });
        }
      }).catch(noop).then(next);
    })();
  })();
})();