Created
April 16, 2022 00:12
-
-
Save udenizdemirbilek/6b3deeb18b7e785b6b2628cb083b42ab to your computer and use it in GitHub Desktop.
Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.8.7+commit.e28d00a7.js&optimize=false&runs=200&gist=
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
// SPDX-License-Identifier: GPL-3.0 | |
pragma solidity >=0.7.0 <0.9.0; | |
/** | |
* @title Ballot | |
* @dev Implements voting process along with vote delegation | |
*/ | |
contract Ballot { | |
// This declares a new complex type which will | |
// be used for variables later. | |
// It will represent a single voter. | |
struct Voter { | |
uint weight; // weight is accumulated by delegation | |
bool voted; // if true, that person already voted | |
address delegate; // person delegated to | |
uint vote; // index of the voted proposal | |
} | |
// This is a type for a single proposal. | |
struct Proposal { | |
// If you can limit the length to a certain number of bytes, | |
// always use one of bytes1 to bytes32 because they are much cheaper | |
bytes32 name; // short name (up to 32 bytes) | |
uint voteCount; // number of accumulated votes | |
} | |
address public chairperson; | |
// This declares a state variable that | |
// stores a `Voter` struct for each possible address. | |
mapping(address => Voter) public voters; | |
// A dynamically-sized array of `Proposal` structs. | |
Proposal[] public proposals; | |
/** | |
* @dev Create a new ballot to choose one of 'proposalNames'. | |
* @param proposalNames names of proposals | |
*/ | |
constructor(bytes32[] memory proposalNames) { | |
chairperson = msg.sender; | |
voters[chairperson].weight = 1; | |
// For each of the provided proposal names, | |
// create a new proposal object and add it | |
// to the end of the array. | |
for (uint i = 0; i < proposalNames.length; i++) { | |
// `Proposal({...})` creates a temporary | |
// Proposal object and `proposals.push(...)` | |
// appends it to the end of `proposals`. | |
proposals.push(Proposal({ | |
name: proposalNames[i], | |
voteCount: 0 | |
})); | |
} | |
} | |
/** | |
* @dev Give 'voter' the right to vote on this ballot. May only be called by 'chairperson'. | |
* @param voter address of voter | |
*/ | |
function giveRightToVote(address voter) external { | |
// If the first argument of `require` evaluates | |
// to `false`, execution terminates and all | |
// changes to the state and to Ether balances | |
// are reverted. | |
// This used to consume all gas in old EVM versions, but | |
// not anymore. | |
// It is often a good idea to use `require` to check if | |
// functions are called correctly. | |
// As a second argument, you can also provide an | |
// explanation about what went wrong. | |
require( | |
msg.sender == chairperson, | |
"Only chairperson can give right to vote." | |
); | |
require( | |
!voters[voter].voted, | |
"The voter already voted." | |
); | |
require(voters[voter].weight == 0); | |
voters[voter].weight = 1; | |
} | |
/** | |
* @dev Delegate your vote to the voter 'to'. | |
* @param to address to which vote is delegated | |
*/ | |
function delegate(address to) external { | |
// assigns reference | |
Voter storage sender = voters[msg.sender]; | |
require(!sender.voted, "You already voted."); | |
require(to != msg.sender, "Self-delegation is disallowed."); | |
// Forward the delegation as long as | |
// `to` also delegated. | |
// In general, such loops are very dangerous, | |
// because if they run too long, they might | |
// need more gas than is available in a block. | |
// In this case, the delegation will not be executed, | |
// but in other situations, such loops might | |
// cause a contract to get "stuck" completely. | |
while (voters[to].delegate != address(0)) { | |
to = voters[to].delegate; | |
// We found a loop in the delegation, not allowed. | |
require(to != msg.sender, "Found loop in delegation."); | |
} | |
// Since `sender` is a reference, this | |
// modifies `voters[msg.sender].voted` | |
sender.voted = true; | |
sender.delegate = to; | |
Voter storage delegate_ = voters[to]; | |
if (delegate_.voted) { | |
// If the delegate already voted, | |
// directly add to the number of votes | |
proposals[delegate_.vote].voteCount += sender.weight; | |
} else { | |
// If the delegate did not vote yet, | |
// add to her weight. | |
delegate_.weight += sender.weight; | |
} | |
} | |
uint public startTime = block.timestamp; | |
/** | |
* @dev Check if the voting period of 5 mins is expired or not and forbid vote if it is | |
*/ | |
modifier voteEnded () { | |
require((block.timestamp-startTime) < 5 minutes, "Vote period has ended"); | |
_; | |
} | |
/** | |
* @dev Give your vote (including votes delegated to you) to proposal 'proposals[proposal].name'. | |
* @param proposal index of proposal in the proposals array | |
*/ | |
function vote(uint proposal) external voteEnded (){ | |
Voter storage sender = voters[msg.sender]; | |
require(sender.weight != 0, "Has no right to vote"); | |
require(!sender.voted, "Already voted."); | |
sender.voted = true; | |
sender.vote = proposal; | |
// If `proposal` is out of the range of the array, | |
// this will throw automatically and revert all | |
// changes. | |
proposals[proposal].voteCount += sender.weight; | |
} | |
/** | |
* @dev Computes the winning proposal taking all previous votes into account. | |
* @return winningProposal_ index of winning proposal in the proposals array | |
*/ | |
function winningProposal() public view | |
returns (uint winningProposal_) | |
{ | |
uint winningVoteCount = 0; | |
for (uint p = 0; p < proposals.length; p++) { | |
if (proposals[p].voteCount > winningVoteCount) { | |
winningVoteCount = proposals[p].voteCount; | |
winningProposal_ = p; | |
} | |
} | |
} | |
/** | |
* @dev Calls winningProposal() function to get the index of the winner contained in the proposals array and then | |
* @return winnerName_ the name of the winner | |
*/ | |
function winnerName() external view | |
returns (bytes32 winnerName_) | |
{ | |
winnerName_ = proposals[winningProposal()].name; | |
} | |
} | |
// proposalArray = | |
// ["0x6331000000000000000000000000000000000000000000000000000000000000","0x6332000000000000000000000000000000000000000000000000000000000000","0x6333000000000000000000000000000000000000000000000000000000000000","0x6334000000000000000000000000000000000000000000000000000000000000"] |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Voting for 1st candidate success
![Screenshot 2022-04-16 at 18-08-06 Remix - Ethereum IDE](https://user-images.githubusercontent.com/81304552/163680333-a9e23fc2-c5be-4221-9040-a33cbb739ce7.png)
![Screenshot 2022-04-16 at 18-11-28 Remix - Ethereum IDE](https://user-images.githubusercontent.com/81304552/163680339-8b7779c5-7b7d-49c4-acbe-fa6a3d818f29.png)
Voting for 1st candidate reverted due to voting period end