Warning! Contract bytecode has been changed and doesn't match the verified one. Therefore, interaction with this smart contract may be risky.
- Contract name:
- Lottery
- Optimization enabled
- true
- Compiler version
- v0.5.17+commit.d19bba13
- Optimization runs
- 200
- EVM Version
- default
- Verified at
- 2024-09-26T15:32:31.186653Z
Contract source code
// SPDX-License-Identifier: GPL-3.0
pragma solidity ^0.5.1;
contract Entropy_interface {
function get_entropy() public view returns (uint256);
}
contract Lottery {
address public owner = msg.sender;
address payable public entropy_contract;
address payable public reward_pool_contract; // Token rewards go to the special "staking contract"
uint256 public deposits_phase_duration = 3 days; // The length of a phase when deposits are accepted;
uint256 public entropy_phase_duration = 1 days; // The length of a phase when entropy providers reveal their entropy inputs;
uint256 public entropy_fee = 30; // (will be divided by 1000 during calculations i.e. 1 means 0.1%) | this reward goes to the entropy providers reward pool
uint256 public token_reward_fee = 100; // This reward goes to staked tokens reward pool
uint256 public min_allowed_bet = 1000 ether; // 1K CLO for now
uint8 public max_allowed_deposits = 20; // A user can make 20 bets during a single round
uint256 public current_round;
uint256 public round_start_timestamp;
uint256 public round_reward;
uint256 private nonce = 0;
bool public round_reward_paid = false;
mapping (uint256 => bool) public round_successful; // Allows "refunds" of not succesful rounds.
uint256 public current_interval_end; // Used for winner calculations
struct interval
{
uint256 interval_start;
uint256 interval_end;
}
struct player
{
mapping (uint256 => uint8) num_deposits;
uint256 last_round;
mapping (uint256 => mapping (uint8 => interval)) win_conditions; // This player is considered to be a winner when RNG provides a number that matches this intervals
mapping (uint256 => bool) round_refunded;
}
mapping (address => player) public players;
function() external payable
{
deposit();
}
function get_round() public view returns (uint256)
{
return current_round;
}
function get_phase() public view returns (uint8)
{
// 0 - the lottery is not active / pending reward claim or new round start
// 1 - a lottery round is in progress/ acquiring deposits
// 2 - deposits are acquired / entropy revealing phase
uint8 _status = 0;
if(round_start_timestamp < now && now < round_start_timestamp + deposits_phase_duration)
{
_status = 1;
}
else if (round_start_timestamp < now && now < round_start_timestamp + deposits_phase_duration + entropy_phase_duration)
{
_status = 2;
}
return _status;
}
function deposit() public payable
{
require (msg.value > min_allowed_bet, "Minimum bet condition is not met");
require (players[msg.sender].num_deposits[current_round] < max_allowed_deposits || players[msg.sender].last_round < current_round, "Too much deposits during this round");
require (get_phase() == 1, "Deposits are only allowed during the depositing phase");
if(players[msg.sender].last_round < current_round)
{
players[msg.sender].last_round = current_round;
players[msg.sender].num_deposits[current_round] = 0;
}
else
{
players[msg.sender].num_deposits[current_round]++;
}
// Assign the "winning interval" for the player
players[msg.sender].win_conditions[current_round][players[msg.sender].num_deposits[current_round]].interval_start = current_interval_end;
players[msg.sender].win_conditions[current_round][players[msg.sender].num_deposits[current_round]].interval_end = current_interval_end + msg.value;
current_interval_end += msg.value;
uint256 _reward_with_fees = msg.value;
// TODO: replace it with SafeMath
// TODO: update the contract to only send rewards upon completion of the round
//send_token_reward(msg.value * token_reward_fee / 1000);
_reward_with_fees -= msg.value * token_reward_fee / 1000;
//send_entropy_reward(msg.value * entropy_fee / 1000);
_reward_with_fees -= msg.value * entropy_fee / 1000;
round_reward += _reward_with_fees;
}
function refund(uint256 _round) external
{
require(current_round > _round, "Only refunds of finished rounds are allowed");
require(!round_successful[_round], "Only refunds of FAILED rounds are allowed");
// Calculating the refund amount
uint256 _reward = 0;
for (uint8 i = 0; i < players[msg.sender].num_deposits[_round]; i++)
{
_reward += players[msg.sender].win_conditions[_round][i].interval_end - players[msg.sender].win_conditions[_round][i].interval_start;
}
// Subtract the entropy fee
_reward -= _reward * entropy_fee / 1000;
players[msg.sender].round_refunded[_round] = true;
msg.sender.transfer(_reward);
}
function send_entropy_reward(uint256 _reward) internal
{
//entropy_contract.transfer(msg.value * entropy_fee / 1000);
entropy_contract.transfer(_reward);
}
function send_token_reward(uint256 _reward) internal
{
//reward_pool_contract.transfer(msg.value * token_reward_fee / 1000);
reward_pool_contract.transfer(_reward);
}
function start_new_round() public payable
{
require(current_round == 0 || round_reward_paid, "Cannot start a new round while reward for the previous one is not paid. Call finish_round function");
current_round++;
round_start_timestamp = now;
current_interval_end = 0;
round_reward_paid = false;
//require_entropy_provider(msg.sender); // Request the starter of a new round to also provide initial entropy
// Initiate the first deposit of the round
deposit();
}
function finish_round(address payable _winner) public
{
// Important: finishing an active round does not automatically start a new one
require(now > round_start_timestamp + deposits_phase_duration + entropy_phase_duration, "Round can be finished after the entropy reveal phase only");
//require(check_entropy_criteria(), "There is not enough entropy to ensure a fair winner calculation");
if(check_entropy_criteria())
{
// Round is succsefully completed and there was enough entropy provided
round_successful[current_round] = true;
// Paying the winner
// Safe loop, cannot be more than 20 iterations
for (uint8 i = 0; i<players[_winner].num_deposits[current_round]; i++)
{
if(players[_winner].win_conditions[current_round][i].interval_start < RNG() && players[_winner].win_conditions[current_round][i].interval_end > RNG())
{
_winner.transfer(round_reward);
round_reward_paid = true;
}
}
}
else
{
// Round is completed without sufficient entropy => allow refunds and increase the round counter
// round_successful[current_round] = false; // This values are `false` by default in solidity
round_reward_paid = true;
}
require(round_reward_paid, "The provided address is not a winner of the current round");
}
function pay_fees() internal
{
}
function random(uint256 to) public returns (uint) {
uint randomnumber = uint(keccak256(abi.encodePacked(block.timestamp, msg.sender, nonce))) % to;
nonce++;
return randomnumber;
}
function RNG() public returns (uint256)
{
// Primitive random number generator dependant on both `entropy` and `interval` for testing reasons
uint256 _entropy = Entropy_interface(entropy_contract).get_entropy();
uint256 _result;
// `entropy` is a random value; can be greater or less than `current_interval_end`
uint256 _current_interval_end = random(current_interval_end + 1);
if(_entropy > _current_interval_end)
{
_result = _entropy % _current_interval_end;
}
else
{
_result = _current_interval_end % _entropy;
}
return _result;
}
function check_entropy_criteria() public returns (bool)
{
// Needs to check the sufficiency of entropy for the round reward prizepool size
return true;
}
modifier only_owner
{
require(msg.sender == owner);
_;
}
modifier only_entropy_contract
{
require(msg.sender == entropy_contract);
_;
}
}
Contract ABI
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Contract Creation Code
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ByteCode
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