belt-apy.js

const puppeteer = require('puppeteer');

let lastCheck = new Date().getTime()
let cache = {}

async function start(){
  if (new Date().getTime() - lastCheck < 1000 * 60 * 30 && cache.eth){
    return cache;
  } else {
    let text = await getWebsite()
    let btc = await getBTC(text)
    let eth = await getETH(text)
    let stable = await get4BELT(text)
    let getStableRate = await getStableRateFunc(text)

    cache = {
      btc: btc.replace('%', ""),
      eth: eth.replace('%', ""),
      stable: stable.replace('%', ""),
      stableRate: getStableRate
    }
    lastCheck = new Date().getTime()
  }
  return cache;
}

async function getWebsite(){
  try {
    const browser = await puppeteer.launch({
        headless: true,
        args: ['--no-sandbox']
    });
    const page = await browser.newPage();
    await page.goto('https://belt.fi/bsc');
    await page.waitForTimeout(7000);
    let text = await page.content()
    await browser.close();
    return text;
  } catch (err) {
    console.error(err);
    return false
  }
}

async function getBTC(text){
  //let split website, and then lower our search field
  text = text.split("Belt Vaults")
  let x = `BTC"`;
  let y = `beltBTC`;
  let str = text[1]
  let first = str.substring(str.indexOf(x) + x.length, str.lastIndexOf(y))
  let second = first.substring(first.indexOf('APR') + 'APR'.length, first.lastIndexOf('Daily'))
  let third = second.substring(second.indexOf('tvl">') + 'tvl">'.length, second.lastIndexOf('</span></div><div class="apr"><span class'))
  return third;
}

async function getETH(text){
  text = text.split("Belt Vaults")
  let x = `ETH"`;
  let y = `beltETH`;
  let str = text[1]
  let first = str.substring(str.indexOf(x) + x.length, str.lastIndexOf(y))
  let second = first.substring(first.indexOf('APR') + 'APR'.length, first.lastIndexOf('Daily'))
  let third = second.substring(second.indexOf('tvl">') + 'tvl">'.length, second.lastIndexOf('</span></div><div class="apr"><span class'))
  let fourth = third.slice(-5);
  return fourth;
}

async function get4BELT(text){
  text = text.split("Belt LP Staking")
  let x = `4Belt`;
  let y = `4Belt BLP`;
  let str = text[1]
  let first = str.substring(str.indexOf(x) + x.length, str.lastIndexOf(y))
  let second = first.substring(first.indexOf('APR') + 'APR'.length, first.lastIndexOf('Daily'))
  let third = second.substring(second.indexOf('tvl">') + 'tvl">'.length, second.lastIndexOf('</span></div><div class="apr"><span class'))
  let fourth = third.substring(0,6);
  return fourth;
}

async function getStableRateFunc(text){
  text = text.split("Belt LP Staking")
  let x = `1 4Belt BLP`;
  let y = `4Belt BLP`;
  let str = text[1]
  let first = str.substring(str.indexOf(x) + x.length, str.lastIndexOf(y))
  let second = first.substring(first.indexOf('=') + '='.length, first.lastIndexOf('</span><div class="tvl">'))
  let third = second.replace(" ", "").replace("$", "")
  return third;
}

module.exports.get = start