业务需求
- 参赛球队一经设定不可改变,整个活动结束后无法投票;
- 全⺠均可参与,无权限控制;
- 每次投票为 1 ether,且只能选择一支球队;
- 每个人可以投注多次;
- 仅管理员公布最终结果,完成奖金分配,开奖后逻辑:
- winner 共享整个奖金池(一部分是自己的本金,一部分是利润);
- winner 需自行领取奖金(因为有手续费);
- 下一期自行开始
- // SPDX-License-Identifier: GPL-3.0
- pragma solidity >=0.7.0 <0.9.0;
- import "hardhat/console.sol";
- contract WorldCup {
- // 1. 状态变量:管理员、所有玩家、获奖者地址、第几期、参赛球队
- // 2. 核心方法:下注、开奖、兑现
- // 3. 辅助方法:获取奖金池金额、管理员地址、当前期数、参与人数、所有玩家、参赛球队
- // 管理员
- address public admin;
- // 第几期
- uint8 public currRound;
- // 参赛球队
- string[] public countries = ["GERMANY", "FRANCH", "CHINA", "BRIZAL", "KOREA"];
- // 期数 => 玩家
- mapping(uint8 => mapping(address => Player)) players;
- // 期数 => 投注各球队的玩家
- mapping(uint8 => mapping(Country => address[])) public countryToPlayers;
- // 玩家对应赢取的奖金
- mapping(address => uint256) public winnerVaults;
- // 投注截止时间-使用不可变量,可通过构造函数传值,部署后无法改变
- uint256 public immutable deadline;
- // 所有玩家待兑现的奖金
- uint256 public lockedAmts;
- enum Country {
- GERMANY,
- FRANCH,
- CHINA,
- BRAZIL,
- KOREA
- }
- event Play(uint8 _currRound, address _player, Country _country);
- event Finialize(uint8 _currRound, uint256 _country);
- event ClaimReward(address _claimer, uint256 _amt);
- // 验证管理员身份
- modifier onlyAdmin {
- require(msg.sender == admin, "not authorized!");
- _;
- }
- // 玩家投注信息
- struct Player {
- // 是否开奖
- bool isSet;
- // 投注的球队份额
- mapping(Country => uint256) counts;
- }
- constructor(uint256 _deadline) {
- admin = msg.sender;
- require(_deadline > block.timestamp, "WorldCupLottery: invalid deadline!");
- deadline = _deadline;
- }
- // 下注过程
- function play(Country _selected) payable external {
- // 参数校验
- require(msg.value == 1 gwei, "invalid funds provided!");
- require(block.timestamp < deadline, "it's all over!");
- // 更新 countryToPlayers
- countryToPlayers[currRound][_selected].push(msg.sender);
- // 更新 players(storage 是引用传值,修改会同步修改原变量)
- Player storage player = players[currRound][msg.sender];
- // player.isSet = false;
- player.counts[_selected] += 1;
- emit Play(currRound, msg.sender, _selected);
- }
- // 开奖过程
- function finialize(Country _country) onlyAdmin external {
- // 找到 winners
- address[] memory winners = countryToPlayers[currRound][_country];
- // 分发给所有压中玩家的实际奖金
- uint256 distributeAmt;
- // 本期总奖励金额(奖池金额 - 所有玩家待兑现的奖金)
- uint currAvalBalance = getVaultBalance() - lockedAmts;
- console.log("currAvalBalance:", currAvalBalance, "winners count:", winners.length);
- for (uint i = 0; i < winners.length; i++) {
- address currWinner = winners[i];
- // 获取每个地址应该得到的份额
- Player storage winner = players[currRound][currWinner];
- if (winner.isSet) {
- console.log("this winner has been set already, will be skipped!");
- continue;
- }
- winner.isSet = true;
- // 玩家购买的份额
- uint currCounts = winner.counts[_country];
- // (本期总奖励 / 总获奖人数)* 当前地址持有份额
- uint amt = (currAvalBalance / countryToPlayers[currRound][_country].length) * currCounts;
- // 玩家对应赢取的奖金
- winnerVaults[currWinner] += amt;
- distributeAmt += amt;
- // 放入待兑现的奖金池
- lockedAmts += amt;
- console.log("winner:", currWinner, "currCounts:", currCounts);
- console.log("reward amt curr:", amt, "total:", winnerVaults[currWinner]);
- }
- // 未分完的奖励即为平台收益
- uint giftAmt = currAvalBalance - distributeAmt;
- if (giftAmt > 0) {
- winnerVaults[admin] += giftAmt;
- }
- emit Finialize(currRound++, uint256(_country));
- }
- // 奖金兑现
- function claimReward() external {
- uint256 rewards = winnerVaults[msg.sender];
- require(rewards > 0, "nothing to claim!");
- // 玩家领取完奖金置为 0
- winnerVaults[msg.sender] = 0;
- // 从待兑现奖金池中移除该玩家份额
- lockedAmts -= rewards;
- (bool succeed,) = msg.sender.call{value: rewards}("");
- require(succeed, "claim reward failed!");
- console.log("rewards:", rewards);
- emit ClaimReward(msg.sender, rewards);
- }
- // 获取奖池金额
- function getVaultBalance() public view returns(uint256 bal) {
- bal = address(this).balance;
- }
- // 获取当期下注当前球队的人数
- function getCountryPlayers(uint8 _round, Country _country) external view returns(uint256) {
- return countryToPlayers[_round][_country].length;
- }
- // 获取当前玩家当期押注份额
- function getPlayerInfo(uint8 _round, address _player, Country _country) external view returns(uint256 _counts) {
- return players[_round][_player].counts[_country];
- }
- }
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