token crawl script.js

const _ = require('lodash')
const whitelist = require('assets/blockchains/ethereum/whitelist.json').map(address => address.toLowerCase())
const { getERC20Name, getERC20Decimals, getERC20Symbol } = require('airswap.js/src/erc20/contractFunctions')
const fs = require('fs')

// package.json
//
// {
//   "name": "token-crawl",
//   "version": "1.0.0",
//   "main": "index.js",
//   "license": "MIT",
//   "dependencies": {
//   "airswap.js": "^0.1.130",
//     "assets": "https://github.com/trustwallet/assets.git",
//     "lodash": "^4.17.15"
//   }
// }

function sleep (time) {
  return new Promise((resolve) => setTimeout(resolve, time));
}

const tokens =[]

whitelist.map(async (address, i) => {
  try {
    await sleep(100 * i)
    const name = await getERC20Name(address)
    const symbol = await getERC20Symbol(address)
    const decimals = (await getERC20Decimals(address)).toString()
    tokens.push({
      name,
      symbol,
      decimals,
      address,
    })
  } catch (e) {
    const { code } = e
    console.log(address, code)
    return
  }

  if(i + 1 === whitelist.length) {
    finish()
  }
})

function finish() {
  console.log(tokens)
  fs.writeFileSync('./tokens.json', JSON.stringify(tokens, null, 2))
}