snt-voting/app/utils/polls.js

import web3 from "Embark/web3"
import MiniMeTokenInterface from 'Embark/contracts/MiniMeTokenInterface';
import PollManager from 'Embark/contracts/PollManager';
import DappToken from 'Embark/contracts/DappToken';

const excluded = {
 // PROPER_LIGHT_CLIENT_SUPPORT : 3,
};

export const getBalance = async (startBlock) => {
  const { fromWei } = web3.utils;
  const { balanceOfAt } = DappToken.methods;
  const balance = await balanceOfAt(web3.eth.defaultAccount, startBlock - 1).call();
  // TODO: use decimals
  return fromWei(balance);
}
export const getVote = async(idPoll) => {
  const { fromWei } = web3.utils;
  const votes = await PollManager.methods.getVote(idPoll, web3.eth.defaultAccount).call();
  return votes.map(el => Math.floor(Math.sqrt(parseInt(fromWei(el)))));
}

const fetchPollData = async (index, pollMethod) => {
  const poll = await pollMethod(index).call({from: web3.eth.defaultAccount});
  const blockInfo = await web3.eth.getBlock(poll._startBlock);
  return { ...poll, idPoll: index, blockInfo };
}

export const getPolls = (number, pollMethod) => {
    const polls = [];
   for (let i = number-1; i >= 0; i--) {
    polls.push(fetchPollData(i, pollMethod));
   }
  return Promise.all(polls.reverse());
}

const excludedPolls = new Set(Object.values(excluded));
const exclusionFilter = (poll, idx) => !excludedPolls.has(idx);
export const omitPolls = polls => polls.filter(exclusionFilter);