I am running a contract on a private network in geth, and using web3js. I have the following error when I run a transaction:
web3.min.js:1 Uncaught (in promise) Error: Returned error: gas required exceeds allowance (89459648255865) or always failing transaction
Here is my contract in solidity:
contract Voting {
/* mapping field below is equivalent to an associative array or hash.
The key of the mapping is candidate name stored as type bytes32 and value is
an unsigned integer to store the vote count
*/
mapping (bytes32 => uint256) public votesReceived;
/* Solidity doesn't let you pass in an array of strings in the constructor (yet).
We will use an array of bytes32 instead to store the list of candidates
*/
bytes32[] public candidateList;
/* This is the constructor which will be called once when you
deploy the contract to the blockchain. When we deploy the contract,
we will pass an array of candidates who will be contesting in the election
*/
constructor(bytes32[] memory candidateNames) public {
candidateList = candidateNames;
}
// This function returns the total votes a candidate has received so far
function totalVotesFor(bytes32 candidate) view public returns (uint256) {
require(validCandidate(candidate));
return votesReceived[candidate];
}
// This function increments the vote count for the specified candidate. This
// is equivalent to casting a vote
function voteForCandidate(bytes32 candidate) public {
require(validCandidate(candidate));
votesReceived[candidate] += 1;
}
function validCandidate(bytes32 candidate) view public returns (bool) {
for(uint i = 0; i < candidateList.length; i++) {
if (candidateList[i] == candidate) {
return true;
}
}
return false;
}
}
And my index.js that I call from a index.html file to use it:
web3 = new Web3(new Web3.providers.HttpProvider("http://localhost:8545"))
var account;
web3.eth.getAccounts().then((f) => {
account = f[0];
})
abi = JSON.parse('[{"constant":true,"inputs":[{"name":"candidate","type":"bytes32"}],"name":"totalVotesFor","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"candidate","type":"bytes32"}],"name":"validCandidate","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"bytes32"}],"name":"votesReceived","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"uint256"}],"name":"candidateList","outputs":[{"name":"","type":"bytes32"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"candidate","type":"bytes32"}],"name":"voteForCandidate","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"inputs":[{"name":"candidateNames","type":"bytes32[]"}],"payable":false,"stateMutability":"nonpayable","type":"constructor"}]')
contract = new web3.eth.Contract(abi);
contract.options.address = "0x71789831d83d4C8325b324eA9B5fFB27525480b5";
// update this contract address with your contract address
candidates = {"Rama": "candidate-1", "Nick": "candidate-2", "Jose": "candidate-3"}
function voteForCandidate(candidate) {
candidateName = $("#candidate").val();
console.log(candidateName);
contract.methods.voteForCandidate(web3.utils.asciiToHex(candidateName)).send({from: account}).then((f) => {
let div_id = candidates[candidateName];
contract.methods.totalVotesFor(web3.utils.asciiToHex(candidateName)).call().then((f) => {
$("#" + div_id).html(f);
})
})
}
$(document).ready(function() {
candidateNames = Object.keys(candidates);
for(var i=0; i<candidateNames.length; i++) {
let name = candidateNames[i];
contract.methods.totalVotesFor(web3.utils.asciiToHex(name)).call().then((f) => {
$("#" + candidates[name]).html(f);
})
}
});
Can somebody help me please ? I am pretty new to this. Thank you
