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December 11, 2022 03:24
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Created using remix-ide: Realtime Ethereum Contract Compiler and Runtime. Load this file by pasting this gists URL or ID at https://remix.ethereum.org/#version=soljson-v0.8.7+commit.e28d00a7.js&optimize=false&runs=200&gist=
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| [core] | |
| repositoryformatversion = 0 | |
| filemode = false | |
| bare = false | |
| logallrefupdates = true | |
| symlinks = false | |
| ignorecase = true |
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| ref: refs/heads/main |
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| DIRC | |
| c�L� �C@c�L� �C@ A �� �}�7i��$���IQ��B.� | |
| README.txt c�L�#@c�L�#@ 6 �� +j�2#�=��C��� p��� contracts/1_Storage.sol c�L��G@c�L��G@ 7 �� �I����*̛���>K���?�' contracts/2_Owner.sol c�L�2 c�L�2 8 �� ���l6 l��8Յ�%��+�Z contracts/3_Ballot.sol c�L��@c�L��@ : �� ���!�)?�U���U-u� scripts/deploy_with_ethers.ts c�L� ��c�L� �� ; �� �W�5��XPwK��ئ��| scripts/deploy_with_web3.ts c�L� | |
| _�c�L� | |
| _� < �� ��uۚCl�j��{�f� X�.B scripts/ethers-lib.ts c�L� �@c�L� �@ = �� O���:���V�)��?�(GY� scripts/web3-lib.ts c�L� ��@c�L� ��@ ? �� �In��ˠ/�ds�9���5��[ tests/Ballot_test.sol c�L� �� c�L� �� @ �� ���Z +��>G����`}%w tests/storage.test.js p�h8 s���M���'����G� |
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| a938f2b2e4270f9806871f748d042ce23e7734b0 |
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| REMIX DEFAULT WORKSPACE | |
| Remix default workspace is present when: | |
| i. Remix loads for the very first time | |
| ii. A new workspace is created with 'Default' template | |
| iii. There are no files existing in the File Explorer | |
| This workspace contains 3 directories: | |
| 1. 'contracts': Holds three contracts with increasing levels of complexity. | |
| 2. 'scripts': Contains four typescript files to deploy a contract. It is explained below. | |
| 3. 'tests': Contains one Solidity test file for 'Ballot' contract & one JS test file for 'Storage' contract. | |
| SCRIPTS | |
| The 'scripts' folder has four typescript files which help to deploy the 'Storage' contract using 'web3.js' and 'ethers.js' libraries. | |
| For the deployment of any other contract, just update the contract's name from 'Storage' to the desired contract and provide constructor arguments accordingly | |
| in the file `deploy_with_ethers.ts` or `deploy_with_web3.ts` | |
| In the 'tests' folder there is a script containing Mocha-Chai unit tests for 'Storage' contract. | |
| To run a script, right click on file name in the file explorer and click 'Run'. Remember, Solidity file must already be compiled. | |
| Output from script will appear in remix terminal. | |
| Please note, require/import is supported in a limited manner for Remix supported modules. | |
| For now, modules supported by Remix are ethers, web3, swarmgw, chai, multihashes, remix and hardhat only for hardhat.ethers object/plugin. | |
| For unsupported modules, an error like this will be thrown: '<module_name> module require is not supported by Remix IDE' will be shown. |
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| // SPDX-License-Identifier: GPL-3.0 | |
| pragma solidity >=0.7.0 <0.9.0; | |
| /** | |
| * @title Storage | |
| * @dev Store & retrieve value in a variable | |
| * @custom:dev-run-script ./scripts/deploy_with_ethers.ts | |
| */ | |
| contract Storage { | |
| uint256 number; | |
| /** | |
| * @dev Store value in variable | |
| * @param num value to store | |
| */ | |
| function store(uint256 num) public { | |
| number = num; | |
| } | |
| /** | |
| * @dev Return value | |
| * @return value of 'number' | |
| */ | |
| function retrieve() public view returns (uint256){ | |
| return number; | |
| } | |
| } |
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| // SPDX-License-Identifier: GPL-3.0 | |
| pragma solidity >=0.7.0 <0.9.0; | |
| import "hardhat/console.sol"; | |
| /** | |
| * @title Owner | |
| * @dev Set & change owner | |
| */ | |
| contract Owner { | |
| address private owner; | |
| // event for EVM logging | |
| event OwnerSet(address indexed oldOwner, address indexed newOwner); | |
| // modifier to check if caller is owner | |
| modifier isOwner() { | |
| // If the first argument of 'require' evaluates to 'false', execution terminates and all | |
| // changes to the state and to Ether balances are reverted. | |
| // This used to consume all gas in old EVM versions, but not anymore. | |
| // It is often a good idea to use 'require' to check if functions are called correctly. | |
| // As a second argument, you can also provide an explanation about what went wrong. | |
| require(msg.sender == owner, "Caller is not owner"); | |
| _; | |
| } | |
| /** | |
| * @dev Set contract deployer as owner | |
| */ | |
| constructor() { | |
| console.log("Owner contract deployed by:", msg.sender); | |
| owner = msg.sender; // 'msg.sender' is sender of current call, contract deployer for a constructor | |
| emit OwnerSet(address(0), owner); | |
| } | |
| /** | |
| * @dev Change owner | |
| * @param newOwner address of new owner | |
| */ | |
| function changeOwner(address newOwner) public isOwner { | |
| emit OwnerSet(owner, newOwner); | |
| owner = newOwner; | |
| } | |
| /** | |
| * @dev Return owner address | |
| * @return address of owner | |
| */ | |
| function getOwner() external view returns (address) { | |
| return owner; | |
| } | |
| } |
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| // SPDX-License-Identifier: GPL-3.0 | |
| pragma solidity >=0.7.0 <0.9.0; | |
| /** | |
| * @title Ballot | |
| * @dev Implements voting process along with vote delegation | |
| */ | |
| contract Ballot { | |
| struct Voter { | |
| uint weight; // weight is accumulated by delegation | |
| bool voted; // if true, that person already voted | |
| address delegate; // person delegated to | |
| uint vote; // index of the voted proposal | |
| } | |
| struct Proposal { | |
| // If you can limit the length to a certain number of bytes, | |
| // always use one of bytes1 to bytes32 because they are much cheaper | |
| bytes32 name; // short name (up to 32 bytes) | |
| uint voteCount; // number of accumulated votes | |
| } | |
| address public chairperson; | |
| mapping(address => Voter) public voters; | |
| Proposal[] public proposals; | |
| /** | |
| * @dev Create a new ballot to choose one of 'proposalNames'. | |
| * @param proposalNames names of proposals | |
| */ | |
| constructor(bytes32[] memory proposalNames) { | |
| chairperson = msg.sender; | |
| voters[chairperson].weight = 1; | |
| for (uint i = 0; i < proposalNames.length; i++) { | |
| // 'Proposal({...})' creates a temporary | |
| // Proposal object and 'proposals.push(...)' | |
| // appends it to the end of 'proposals'. | |
| proposals.push(Proposal({ | |
| name: proposalNames[i], | |
| voteCount: 0 | |
| })); | |
| } | |
| } | |
| /** | |
| * @dev Give 'voter' the right to vote on this ballot. May only be called by 'chairperson'. | |
| * @param voter address of voter | |
| */ | |
| function giveRightToVote(address voter) public { | |
| require( | |
| msg.sender == chairperson, | |
| "Only chairperson can give right to vote." | |
| ); | |
| require( | |
| !voters[voter].voted, | |
| "The voter already voted." | |
| ); | |
| require(voters[voter].weight == 0); | |
| voters[voter].weight = 1; | |
| } | |
| /** | |
| * @dev Delegate your vote to the voter 'to'. | |
| * @param to address to which vote is delegated | |
| */ | |
| function delegate(address to) public { | |
| Voter storage sender = voters[msg.sender]; | |
| require(!sender.voted, "You already voted."); | |
| require(to != msg.sender, "Self-delegation is disallowed."); | |
| while (voters[to].delegate != address(0)) { | |
| to = voters[to].delegate; | |
| // We found a loop in the delegation, not allowed. | |
| require(to != msg.sender, "Found loop in delegation."); | |
| } | |
| sender.voted = true; | |
| sender.delegate = to; | |
| Voter storage delegate_ = voters[to]; | |
| if (delegate_.voted) { | |
| // If the delegate already voted, | |
| // directly add to the number of votes | |
| proposals[delegate_.vote].voteCount += sender.weight; | |
| } else { | |
| // If the delegate did not vote yet, | |
| // add to her weight. | |
| delegate_.weight += sender.weight; | |
| } | |
| } | |
| /** | |
| * @dev Give your vote (including votes delegated to you) to proposal 'proposals[proposal].name'. | |
| * @param proposal index of proposal in the proposals array | |
| */ | |
| function vote(uint proposal) public { | |
| Voter storage sender = voters[msg.sender]; | |
| require(sender.weight != 0, "Has no right to vote"); | |
| require(!sender.voted, "Already voted."); | |
| sender.voted = true; | |
| sender.vote = proposal; | |
| // If 'proposal' is out of the range of the array, | |
| // this will throw automatically and revert all | |
| // changes. | |
| proposals[proposal].voteCount += sender.weight; | |
| } | |
| /** | |
| * @dev Computes the winning proposal taking all previous votes into account. | |
| * @return winningProposal_ index of winning proposal in the proposals array | |
| */ | |
| function winningProposal() public view | |
| returns (uint winningProposal_) | |
| { | |
| uint winningVoteCount = 0; | |
| for (uint p = 0; p < proposals.length; p++) { | |
| if (proposals[p].voteCount > winningVoteCount) { | |
| winningVoteCount = proposals[p].voteCount; | |
| winningProposal_ = p; | |
| } | |
| } | |
| } | |
| /** | |
| * @dev Calls winningProposal() function to get the index of the winner contained in the proposals array and then | |
| * @return winnerName_ the name of the winner | |
| */ | |
| function winnerName() public view | |
| returns (bytes32 winnerName_) | |
| { | |
| winnerName_ = proposals[winningProposal()].name; | |
| } | |
| } |
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| // SPDX-License-Identifier: MIT | |
| pragma solidity ^0.8.4; | |
| import "./RealEstateProperty.sol"; | |
| contract RealEstateFactory { | |
| address public owner; // the owner of the contract | |
| uint256 public price; // the price of the property | |
| string public name; // the name of the property | |
| string public description; // the description of the property | |
| RealEstateProperty[] public properties; // the properties | |
| constructor() { | |
| owner = msg.sender; // the owner of the contract is the one who deployed it | |
| } | |
| // create a new property | |
| function createProperty( | |
| string memory _name, // the name of the property | |
| string memory _description, // the description of the property | |
| uint256 _price // the price of the property | |
| ) public { | |
| //_description = "This is a test description"; | |
| RealEstateProperty property = new RealEstateProperty( | |
| _name, // the name of the property | |
| _description, // the description of the property | |
| _price, // the price of the property | |
| msg.sender // the owner of the property | |
| ); | |
| properties.push(property); // add the property to the properties array | |
| } | |
| // get all the properties | |
| function getProperties() public view returns (RealEstateProperty[] memory) { | |
| return properties; | |
| } | |
| } |
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| // SPDX-License-Identifier: MIT | |
| pragma solidity ^0.8.4; | |
| import "@openzeppelin/contracts/token/ERC721/ERC721.sol"; | |
| contract CeloNFT is ERC721 { | |
| constructor() ERC721("CeloNFT", "cNFT") { | |
| // mint 5 NFTs to yourself | |
| for (uint256 i = 0; i < 5; i++) { | |
| _mint(msg.sender, i); | |
| } | |
| } | |
| // Hardcoded token URI will return the same metadata | |
| // for each NFT | |
| function tokenURI(uint256) public pure override returns (string memory) { | |
| return "ipfs://QmTy8w65yBXgyfG2ZBg5TrfB2hPjrDQH3RCQFJGkARStJb"; | |
| } | |
| } | |
| //function to return the NFTs owned by the user | |
| function getNFTs() public view returns (uint256[] memory) { | |
| uint256[] memory result = new uint256[](balanceOf(msg.sender)); | |
| for (uint256 i = 0; i < balanceOf(msg.sender); i++) { | |
| result[i] = tokenOfOwnerByIndex(msg.sender, i); | |
| } | |
| return result; | |
| } |
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| // SPDX-License-Identifier: MIT | |
| pragma solidity ^0.8.4; | |
| import "./RealEstateProperty.sol"; | |
| contract TokenProprety { | |
| //address of the owner of the contract | |
| address public owner; | |
| //amount of tokens stored in the contract | |
| uint256 public tokensStored; | |
| //address of the real estate property contract | |
| RealEstateProperty public realEstateProperty; | |
| //address of the token contract | |
| constructor() { | |
| owner = msg.sender; // the owner of the contract is the one who deployed it | |
| } | |
| //function to change the owner of the property | |
| function changeOwner(address _newOwner) public { | |
| require(msg.sender == owner, "Only the owner can change the owner"); | |
| owner = _newOwner; | |
| } | |
| //function to store ethers tokens in the contract | |
| function storeTokens() public payable { | |
| require(msg.sender == owner, "Only the owner can store tokens"); | |
| tokensStored += msg.value; | |
| } | |
| //send celo tokens to the owner | |
| function sendTokens() public { | |
| require(msg.sender == owner, "Only the owner can send tokens"); | |
| payable(owner).transfer(tokensStored); | |
| tokensStored = 0; | |
| } | |
| } |
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| // This script can be used to deploy the "Storage" contract using ethers.js library. | |
| // Please make sure to compile "./contracts/1_Storage.sol" file before running this script. | |
| // And use Right click -> "Run" from context menu of the file to run the script. Shortcut: Ctrl+Shift+S | |
| import { deploy } from './ethers-lib' | |
| (async () => { | |
| try { | |
| const result = await deploy('Storage', []) | |
| console.log(`address: ${result.address}`) | |
| } catch (e) { | |
| console.log(e.message) | |
| } | |
| })() |
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| // This script can be used to deploy the "Storage" contract using Web3 library. | |
| // Please make sure to compile "./contracts/1_Storage.sol" file before running this script. | |
| // And use Right click -> "Run" from context menu of the file to run the script. Shortcut: Ctrl+Shift+S | |
| import { deploy } from './web3-lib' | |
| (async () => { | |
| try { | |
| const result = await deploy('Storage', []) | |
| console.log(`address: ${result.address}`) | |
| } catch (e) { | |
| console.log(e.message) | |
| } | |
| })() |
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| import { ethers } from 'ethers' | |
| /** | |
| * Deploy the given contract | |
| * @param {string} contractName name of the contract to deploy | |
| * @param {Array<any>} args list of constructor' parameters | |
| * @param {Number} accountIndex account index from the exposed account | |
| * @return {Contract} deployed contract | |
| */ | |
| export const deploy = async (contractName: string, args: Array<any>, accountIndex?: number): Promise<ethers.Contract> => { | |
| console.log(`deploying ${contractName}`) | |
| // Note that the script needs the ABI which is generated from the compilation artifact. | |
| // Make sure contract is compiled and artifacts are generated | |
| const artifactsPath = `browser/contracts/artifacts/${contractName}.json` // Change this for different path | |
| const metadata = JSON.parse(await remix.call('fileManager', 'getFile', artifactsPath)) | |
| // 'web3Provider' is a remix global variable object | |
| const signer = (new ethers.providers.Web3Provider(web3Provider)).getSigner(accountIndex) | |
| const factory = new ethers.ContractFactory(metadata.abi, metadata.data.bytecode.object, signer) | |
| const contract = await factory.deploy(...args) | |
| // The contract is NOT deployed yet; we must wait until it is mined | |
| await contract.deployed() | |
| return contract | |
| } |
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| import Web3 from 'web3' | |
| import { Contract, ContractSendMethod, Options } from 'web3-eth-contract' | |
| /** | |
| * Deploy the given contract | |
| * @param {string} contractName name of the contract to deploy | |
| * @param {Array<any>} args list of constructor' parameters | |
| * @param {string} from account used to send the transaction | |
| * @param {number} gas gas limit | |
| * @return {Options} deployed contract | |
| */ | |
| export const deploy = async (contractName: string, args: Array<any>, from?: string, gas?: number): Promise<Options> => { | |
| const web3 = new Web3(web3Provider) | |
| console.log(`deploying ${contractName}`) | |
| // Note that the script needs the ABI which is generated from the compilation artifact. | |
| // Make sure contract is compiled and artifacts are generated | |
| const artifactsPath = `browser/contracts/artifacts/${contractName}.json` | |
| const metadata = JSON.parse(await remix.call('fileManager', 'getFile', artifactsPath)) | |
| const accounts = await web3.eth.getAccounts() | |
| const contract: Contract = new web3.eth.Contract(metadata.abi) | |
| const contractSend: ContractSendMethod = contract.deploy({ | |
| data: metadata.data.bytecode.object, | |
| arguments: args | |
| }) | |
| const newContractInstance = await contractSend.send({ | |
| from: from || accounts[0], | |
| gas: gas || 1500000 | |
| }) | |
| return newContractInstance.options | |
| } |
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| // SPDX-License-Identifier: GPL-3.0 | |
| pragma solidity >=0.7.0 <0.9.0; | |
| import "remix_tests.sol"; // this import is automatically injected by Remix. | |
| import "hardhat/console.sol"; | |
| import "../contracts/3_Ballot.sol"; | |
| contract BallotTest { | |
| bytes32[] proposalNames; | |
| Ballot ballotToTest; | |
| function beforeAll () public { | |
| proposalNames.push(bytes32("candidate1")); | |
| ballotToTest = new Ballot(proposalNames); | |
| } | |
| function checkWinningProposal () public { | |
| console.log("Running checkWinningProposal"); | |
| ballotToTest.vote(0); | |
| Assert.equal(ballotToTest.winningProposal(), uint(0), "proposal at index 0 should be the winning proposal"); | |
| Assert.equal(ballotToTest.winnerName(), bytes32("candidate1"), "candidate1 should be the winner name"); | |
| } | |
| function checkWinninProposalWithReturnValue () public view returns (bool) { | |
| return ballotToTest.winningProposal() == 0; | |
| } | |
| } |
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| // Right click on the script name and hit "Run" to execute | |
| const { expect } = require("chai"); | |
| const { ethers } = require("hardhat"); | |
| describe("Storage", function () { | |
| it("test initial value", async function () { | |
| const Storage = await ethers.getContractFactory("Storage"); | |
| const storage = await Storage.deploy(); | |
| await storage.deployed(); | |
| console.log('storage deployed at:'+ storage.address) | |
| expect((await storage.retrieve()).toNumber()).to.equal(0); | |
| }); | |
| it("test updating and retrieving updated value", async function () { | |
| const Storage = await ethers.getContractFactory("Storage"); | |
| const storage = await Storage.deploy(); | |
| await storage.deployed(); | |
| const storage2 = await ethers.getContractAt("Storage", storage.address); | |
| const setValue = await storage2.store(56); | |
| await setValue.wait(); | |
| expect((await storage2.retrieve()).toNumber()).to.equal(56); | |
| }); | |
| }); |
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