xdvf.js

const DVF = require('./dvf')
const _ = require('lodash')
const { splitSymbol, prepareAmount, preparePrice } = require('dvf-utils')
const { PRIVATE_KEY, ALCHEMY_URL } = require('./config')
const request = require('request-promise')

const PAIR = 'DVF:xDVF'

let dvf

let lastMidPrice

let tokenQuote
let tokenBase

onStartUp()

let pair, routeBuy, routeSell, buySide, sellSide, midPrice
async function marketMake () {
  periodicReplace()
  setInterval(periodicReplace, 600000)
}

async function periodicReplace() {
    midPrice = await getOraclePrice()
    console.log(midPrice)
    const haveOpenOrders = await checkIfOpenOrders()
    if (midPrice !== lastMidPrice || !haveOpenOrders) {
      lastMidPrice = midPrice
      replaceOrders()
    }
}

async function onStartUp () {
  dvf = await DVF()
  await syncBalances()
  console.log('Starting balances: ', balanceA, balanceB)
  marketMake()
}

// Trading Functions

let balanceA
let balanceB

async function cancelOpenOrders () {
  const orders = await dvf.getOrders()
  orders.forEach(o => {
    if (o.symbol != PAIR) return
    dvf.cancelOrder(o._id)
  })
}

async function checkIfOpenOrders () {
  const orders = await dvf.getOrders()
  return orders.length > 0
}

async function syncBalances () {
  const balances = _.chain(await dvf.getBalance())
    .keyBy('token')
    .mapValues('available')
    .value()
  const [quote, base] = splitSymbol(PAIR)
  balanceA = dvf.token.fromQuantizedAmount(quote, balances[quote])
  balanceB = dvf.token.fromQuantizedAmount(base, balances[base])
  balanceA = balanceA === 'NaN' ? 0 : balanceA
  balanceB = balanceB === 'NaN' ? 0 : balanceB
}

async function replaceOrders () {
  await cancelOpenOrders()
  setTimeout(async() => {
    await syncBalances()
    const balanceToSell = Math.min(0.9 * balanceA, 500000 / lastMidPrice)
    placeOrder(-1 * balanceToSell)
    const balanceToBuy = Math.min(0.9 * balanceB / lastMidPrice, 500000 / lastMidPrice)
    placeOrder(balanceToBuy)
  }, 2000)
}

async function placeOrder (amount) {
  amount = 100 * Math.trunc(prepareAmount(amount, 0) / 100)
  if (amount === '0') return

  const [quote, base] = splitSymbol(PAIR)
  let price
  if (amount > 0) {
    price = preparePrice(lastMidPrice * 0.9999)
    console.log('Place buy at:', price)
  } else {
    price = preparePrice(lastMidPrice * 1.00)
    console.log('Place sell at:', price)
  }
  if (!price) return

console.log(amount, price)

  try {
    await dvf.submitOrder({
      symbol: PAIR,
      amount,
      price,
      starkPrivateKey: PRIVATE_KEY.substring(2)
    })
  } catch (e) {
    const error = (e.error && e.error.details && e.error.details.error) || {}
    console.warn(`Trade not completed: ${error.error}`)
  }
}

let config, quote, base
async function getOraclePrice () {

  // TODO: Call the xDVF contract to get the balance of DVF it holds, and the total balance, and calc exchange rate. Or create an API for this

  console.log('Oracle price: 1')
  return 1
}