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tvd12 Enlightened
tvd12 Enlightened
Ý tưởng về trò chơi lời hứa - 001: định nghĩa contract
Mình có ý tưởng về 1 game blockchain: giữ lời hứa, và đây là Contract sơ bộ: <p> </p> <pre> // contracts/KeepPromise.sol // SPDX-License-Identifier: MIT pragma solidity ^0.8.0; import "./ERC721.sol"; import "./../../utils/Counters.sol"; struct Promise { uint256 _id; string _promise; string _deadline; string _punishment; address _punisher; } contract KeepPromise is ERC721 { using Counters for Counters.Counter; Counters.Counter private _promiseIds; mapping(uint256 =&gt; Promise) private _promises; mapping(address =&gt; string) private _playerNickNames; constructor() public ERC721("Promise", "PRM") {} function join(string memory pNickName) public returns(string memory) { address player = msg.sender; require(_notJoined(player), "KeepPromise: you've already joined game"); _playerNickNames[player] = pNickName; return string(abi.encodePacked("SUCCESS: ", pNickName)); } function submitPromise( string memory pPromise, string memory pDeadline, string memory pPunishment, address pPunisher ) public returns (uint256) { address player = msg.sender; require(_joined(player), "KeepPromise: you've not joined game yet"); require(_joined(pPunisher), "KeepPromise: the Punisher's not joined game yet"); _promiseIds.increment(); uint256 newPromiseId = _promiseIds.current(); _mint(player, newPromiseId); Promise memory prom = Promise(newPromiseId, pPromise, pDeadline, pPunishment, pPunisher); _addPromise(newPromiseId, prom); return newPromiseId; } function getPromise(uint256 pPromiseId) public view returns(Promise memory) { address player = msg.sender; require(_joined(player), "KeepPromise: you've not joined game yet"); return _promises[pPromiseId]; } function getNickName() public view returns(string memory) { address player = msg.sender; return _playerNickNames[player]; } function getPlayerNickName(address pPlayer) public view returns(string memory) { return _playerNickNames[pPlayer]; } function _addPromise(uint256 pPromiseId, Promise memory pPromise) internal virtual { _promises[pPromiseId] = pPromise; } function _joined(address pPlayer) internal view virtual returns (bool) { return bytes(_playerNickNames[pPlayer]).length != 0; } function _notJoined(address pPlayer) internal view virtual returns (bool) { return bytes(_playerNickNames[pPlayer]).length == 0; } } </pre> <p> </p> <p> Chạy lệnh sẽ thế này: </p> <p> </p> <pre> let contract = await KeepPromise.deployed() contract.join("Dzung") contract.getNickName(); contract.submitPromise("Love myself", "2021-12-12", "Love Her", "0x3c31b4b9d6c24bad29498f99aaa6914231362c7f") contract.getPromise(1); </pre>
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