ens-usernames/app/actions/accounts.js

import ERC20Token from 'Embark/contracts/ERC20Token'
import UsernameRegistrar from 'Embark/contracts/UsernameRegistrar'
import TestToken from 'Embark/contracts/TestToken'

import { getDefaultAccount } from '../utils/web3Helpers'
import { actions as accountActions } from '../reducers/accounts'
import { isNil } from 'lodash'

const { receiveAccounts, receiveStatusContactCode } = accountActions
const CONTACT_CODE = 'CONTACT_CODE'
const STATUS_API_REQUEST = 'STATUS_API_REQUEST'
const hasContactCode = () => !isNil(STATUS_API) && !isNil(STATUS_API[CONTACT_CODE])
const statusApiSuccess = event => event.detail.permissions[0] === CONTACT_CODE
const getContactCode = event => event.detail.data[CONTACT_CODE]

export const fetchAndDispatchAccountsWithBalances = (web3, dispatch) => {
  web3.eth.getAccounts((err, addresses) => {
    if (addresses) {
      const defaultAccount = web3.eth.defaultAccount || addresses[0]
      const accounts = addresses.map(async address => {
        const balance = await web3.eth.getBalance(address, 'latest')
        const SNTBalance = await ERC20Token.methods.balanceOf(address).call()
        return { address, balance, SNTBalance }
      })
      Promise.all(accounts).then(accounts => {
        dispatch(receiveAccounts(defaultAccount, accounts))
      })
    }
  })
}
export const checkAndDispatchStatusContactCode = dispatch => {
  window.addEventListener('statusapi', function (event) {
    if (statusApiSuccess(event)) dispatch(receiveStatusContactCode(getContactCode(event)))
  });

  setTimeout(
    () => { window.postMessage({ type: STATUS_API_REQUEST, permissions: ["CONTACT_CODE", "CONTACTS"] }, '*') },
    1000
  )
}

export const fetchAndDispatchSNTAllowance = dispatch => {
  const { methods: { allowance } } = TestToken;
  const { receiveSntAllowance } = accountActions;
  const spender = UsernameRegistrar._address;
  allowance(getDefaultAccount(), spender)
    .call()
    .then(allowance => {
      dispatch(receiveSntAllowance(allowance))
    })
}