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Solidity Contract for Hackathon.
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pragma solidity ^0.4.0; | |
contract Contest{ | |
struct Participant { | |
string email; | |
address account; | |
bool participated; | |
} | |
Participant[] participants; | |
string public company_name; | |
uint public prize_amount = 0; | |
uint public expiry_time; | |
address public creator; | |
address public beneficiary; | |
bool ended; | |
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 { | |
// TODO: 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() public { | |
require(!ended); | |
require(msg.sender != creator); | |
// require(participants[]); | |
participants.push(Participant({ | |
email: 'charu@gmail.com', | |
account: msg.sender, | |
participated: true | |
})); | |
} | |
function end() public { | |
require(!ended); | |
beneficiary = choose_winner(); | |
transfer_money(); | |
} | |
// randomly picking a winner and calling the function `transfer_money` | |
function choose_winner() public view returns (address winner) { | |
require(!ended); | |
// 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; | |
winner = participants[random_winner_index].account; | |
ended = true; | |
} | |
// transfer the money from the wallet to either the winner(participant) or the creeator conditionally | |
function transfer_money() public { | |
require(!ended); | |
beneficiary.transfer(prize_amount); | |
} | |
// Not working | |
// function get_participants() public view returns (address[] _participants) { | |
// for(uint p = 0; p < participants.length; p++) { | |
// _participants.push( participants[p].account ); | |
// } | |
// } | |
function kill() public { | |
require(msg.sender == creator); | |
selfdestruct(creator); | |
} | |
} |
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https://gist.github.com/raghavgarg1257/65679c9e80c778b7d21f1922a7e5c303