callable

Polls.js

// Specify signatures of callable/callback functions (with no spaces!)
const CALLABLE = "countVotes(uint,uint[],uint[])";
const CALLBACK = "updatePollStatus(uint,uint,uint)";
 
async enigmaTask(pollID) {
  let poll = await this.props.voting.polls.call(pollID, {
    from: this.props.enigmaSetup.accounts[this.props.curAccount],
    gas: GAS
  });
  let pollCreator = poll[0];
  // Get list of voters from contract given pollID
  let voters = await this.props.voting.getVotersForPoll.call(pollID, {
    from: pollCreator,
    gas: GAS
  });
  // Initialize empty encryptedVotes and weights arrays
  let encryptedVotes = [];
  let weights = [];
  if (voters.length === 0) {
    encryptedVotes.push(getEncryptedValue(0));
    weights.push(0);
  }
  // Loop through all the voters
  for (let i = 0; i < voters.length; i++) {
    // Obtain poll info (encrypted vote and weight) for that voter
    let pollInfoForVoter = await this.props.voting.getPollInfoForVoter.call(
      pollID,
      voters[i],
      {
        from: pollCreator,
        gas: GAS
      }
    );
    // Add encrypted vote to encryptedVotes array
    encryptedVotes.push(pollInfoForVoter[0]);
    let weight = this.props.enigmaSetup.web3.utils.toBN(
      this.props.enigmaSetup.web3.utils.fromWei(
        String(pollInfoForVoter[1].toNumber()),
        "Ether"
      )
    );
    // Add weight to weights array
    weights.push(weight);
  }

  let blockNumber = await this.props.enigmaSetup.web3.eth.getBlockNumber();
  /*
  Take special note of the arguments passed in here (blockNumber, dappContractAddress, 
  callable, callableArgs, callback, fee, preprocessors). This is the critical step for how
  you run the secure computation from your front-end!!!
  */
  let task = await this.props.enigmaSetup.enigma.createTask(
    blockNumber,
    this.props.voting.address,
    CALLABLE,
    [pollID, encryptedVotes, weights],
    CALLBACK,
    ENG_FEE,
    []
  );
  let resultFee = await task.approveFee({
    from: this.props.enigmaSetup.accounts[0],
    gas: GAS
  });
  let result = await task.compute({
    from: this.props.enigmaSetup.accounts[0],
    gas: GAS
  });
  console.log("got tx:", result.tx, "for task:", task.taskId, "");
  console.log("mined on block:", result.receipt.blockNumber);
}