-
-
Save raghavgarg1257/65679c9e80c778b7d21f1922a7e5c303 to your computer and use it in GitHub Desktop.
Solidity Contract for Hackathon.
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
pragma solidity ^0.4.0; | |
contract Contest{ | |
struct Participant { | |
string email; | |
address account; | |
bool participated; | |
} | |
Participant[] participants; | |
address[] public participantsAccts; | |
string public company_name; | |
uint public prize_amount = 0; // need to change it to accept the float | |
uint public expiry_time; | |
address public creator; | |
address public beneficiary; | |
bool public ended = false; | |
function Contest(string _company_name, uint _expiry_time) public { | |
require(now <= _expiry_time); | |
creator = msg.sender; | |
beneficiary = msg.sender; | |
company_name = _company_name; | |
expiry_time = _expiry_time; | |
} | |
// get money from creator and add it to the global wallet. | |
function load_wallet() public payable { | |
// only owner of contract can load the wallet | |
require(msg.sender == creator); | |
require(msg.value > 0); | |
prize_amount = msg.value; | |
} | |
// adding the particant to the array | |
function participate(string _email) public { | |
// require(!ended); | |
require(msg.sender != creator); | |
// TODO: every participant can participate only once | |
participants.push(Participant({ | |
email: _email, | |
account: msg.sender, | |
participated: true | |
})); | |
participantsAccts.push(msg.sender) -1; | |
} | |
function end() public { | |
// require(!ended); | |
beneficiary = choose_winner(); | |
transfer_money(beneficiary); | |
} | |
// randomly picking a winner and calling the function `transfer_money` | |
function choose_winner() public view returns (address) { | |
require(!ended); | |
// TODO: if expiry is greater than now | |
// require(expiry_time < now); | |
require(participants.length != 0); | |
uint total_participant = participants.length; | |
uint random_winner_index = uint(block.blockhash(block.number-1))%total_participant; | |
address winner = participants[random_winner_index].account; | |
ended = true; | |
return winner; | |
} | |
// transfer the money from the wallet to either the winner(participant) or the creeator conditionally | |
function transfer_money(address winner_account) public { | |
require(!ended); | |
require(msg.sender == creator); | |
winner_account.transfer(prize_amount-1); | |
} | |
// to get all the participants | |
function get_participants() view public returns (address[]) { | |
return participantsAccts; | |
} | |
function kill() public { | |
require(msg.sender == creator); | |
selfdestruct(creator); | |
} | |
} |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment