Bir DeFi uygulaması oluşturun ve dağıtın

mkdir your-project-name
cd your-project-name
truffle init

npm install @openzeppelin/contracts

1pragma solidity ^0.8.0;
2
3import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
4
5contract MyToken is ERC20 {
6    constructor() public ERC20("MyToken", "MTKN"){
7        _mint(msg.sender, 1000000000000000000000000);
8    }
9}
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 Kopyala

1string private _name;
2string private _symbol;
3uint8 private _decimals;
4
5constructor (string memory name_, string memory symbol_) public {
6    _name = name_;
7    _symbol = symbol_;
8    _decimals = 18;
9}
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 Kopyala

truffle version

1// Configure your compilers
2compilers: {
3  solc: {
4    version: "^0.8.0",    // Fetch exact version from solc-bin (default: truffle's version)
5    // docker: true,        // Use "0.5.1" you've installed locally with docker (default: false)
6    // settings: {          // See the solidity docs for advice about optimization and evmVersion
7    //  optimizer: {
8    //    enabled: false,
9    //    runs: 200
10    //  },
11    //  evmVersion: "byzantium"
12    // }
13  }
14}
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truffle compile

1const MyToken = artifacts.require("MyToken")
2
3module.exports = async function (deployer, network, accounts) {
4  // Deploy MyToken
5  await deployer.deploy(MyToken)
6  const myToken = await MyToken.deployed()
7}

truffle migrate

truffle console

1pragma solidity ^0.6.2;
2
3import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
4import "@openzeppelin/contracts/utils/Address.sol";
5import "@openzeppelin/contracts/token/ERC20/utils/SafeERC20.sol";
6import "@openzeppelin/contracts/token/ERC20/ERC20.sol";
7
8contract FarmToken is ERC20 {
9    using Address for address;
10    using SafeMath for uint256; // As of Solidity v0.8.0, mathematical operations can be done safely without the need for SafeMath
11    using SafeERC20 for IERC20;
12
13    IERC20 public token;
14
15    constructor(address _token)
16        public
17        ERC20("FarmToken", "FRM")
18    {
19        token = IERC20(_token);
20    }
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 Kopyala

1function balance() public view returns (uint256) {
2    return token.balanceOf(address(this));
3}
 Kopyala

1function deposit(uint256 _amount) public {
2    // Amount must be greater than zero
3    require(_amount > 0, "amount cannot be 0");
4
5    // Transfer MyToken to smart contract
6    token.safeTransferFrom(msg.sender, address(this), _amount);
7
8    // Mint FarmToken to msg sender
9    _mint(msg.sender, _amount);
10}
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 Kopyala

1function withdraw(uint256 _amount) public {
2    // Burn FarmTokens from msg sender
3    _burn(msg.sender, _amount);
4
5    // Transfer MyTokens from this smart contract to msg sender
6    token.safeTransfer(msg.sender, _amount);
7}
 Kopyala

1const MyToken = artifacts.require("MyToken")
2const FarmToken = artifacts.require("FarmToken")
3
4module.exports = async function (deployer, network, accounts) {
5  // Deploy MyToken
6  await deployer.deploy(MyToken)
7  const myToken = await MyToken.deployed()
8
9  // Deploy Farm Token
10  await deployer.deploy(FarmToken, myToken.address)
11  const farmToken = await FarmToken.deployed()
12}
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1const MyToken = artifacts.require("MyToken")
2const FarmToken = artifacts.require("FarmToken")
3
4module.exports = async function (callback) {
5  myToken = await MyToken.deployed()
6  farmToken = await FarmToken.deployed()
7  balance = await myToken.balanceOf(farmToken.address)
8  console.log(web3.utils.fromWei(balance.toString()))
9  callback()
10}
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truffle exec .\scripts\getMyTokenBalance.js

1const MyToken = artifacts.require("MyToken")
2const FarmToken = artifacts.require("FarmToken")
3
4module.exports = async function (callback) {
5  const accounts = await new web3.eth.getAccounts()
6  const myToken = await MyToken.deployed()
7  const farmToken = await FarmToken.deployed()
8
9  // Returns the remaining number of tokens that spender will be allowed to spend on behalf of owner through transferFrom.
10  // This is zero by default.
11  const allowanceBefore = await myToken.allowance(
12    accounts[0],
13    farmToken.address
14  )
15  console.log(
16    "Amount of MyToken FarmToken is allowed to transfer on our behalf Before: " +
17      allowanceBefore.toString()
18  )
19
20  // In order to allow the Smart Contract to transfer to MyToken (ERC-20) on the accounts[0] behalf,
21  // we must explicitly allow it.
22  // We allow farmToken to transfer x amount of MyToken on our behalf
23  await myToken.approve(farmToken.address, web3.utils.toWei("100", "ether"))
24
25  // Validate that the farmToken can now move x amount of MyToken on our behalf
26  const allowanceAfter = await myToken.allowance(accounts[0], farmToken.address)
27  console.log(
28    "Amount of MyToken FarmToken is allowed to transfer on our behalf After: " +
29      allowanceAfter.toString()
30  )
31
32  // Verify accounts[0] and farmToken balance of MyToken before and after the transfer
33  balanceMyTokenBeforeAccounts0 = await myToken.balanceOf(accounts[0])
34  balanceMyTokenBeforeFarmToken = await myToken.balanceOf(farmToken.address)
35  console.log("*** My Token ***")
36  console.log(
37    "Balance MyToken Before accounts[0] " +
38      web3.utils.fromWei(balanceMyTokenBeforeAccounts0.toString())
39  )
40  console.log(
41    "Balance MyToken Before TokenFarm " +
42      web3.utils.fromWei(balanceMyTokenBeforeFarmToken.toString())
43  )
44
45  console.log("*** Farm Token ***")
46  balanceFarmTokenBeforeAccounts0 = await farmToken.balanceOf(accounts[0])
47  balanceFarmTokenBeforeFarmToken = await farmToken.balanceOf(farmToken.address)
48  console.log(
49    "Balance FarmToken Before accounts[0] " +
50      web3.utils.fromWei(balanceFarmTokenBeforeAccounts0.toString())
51  )
52  console.log(
53    "Balance FarmToken Before TokenFarm " +
54      web3.utils.fromWei(balanceFarmTokenBeforeFarmToken.toString())
55  )
56  // Call Deposit function from FarmToken
57  console.log("Call Deposit Function")
58  await farmToken.deposit(web3.utils.toWei("100", "ether"))
59  console.log("*** My Token ***")
60  balanceMyTokenAfterAccounts0 = await myToken.balanceOf(accounts[0])
61  balanceMyTokenAfterFarmToken = await myToken.balanceOf(farmToken.address)
62  console.log(
63    "Balance MyToken After accounts[0] " +
64      web3.utils.fromWei(balanceMyTokenAfterAccounts0.toString())
65  )
66  console.log(
67    "Balance MyToken After TokenFarm " +
68      web3.utils.fromWei(balanceMyTokenAfterFarmToken.toString())
69  )
70
71  console.log("*** Farm Token ***")
72  balanceFarmTokenAfterAccounts0 = await farmToken.balanceOf(accounts[0])
73  balanceFarmTokenAfterFarmToken = await farmToken.balanceOf(farmToken.address)
74  console.log(
75    "Balance FarmToken After accounts[0] " +
76      web3.utils.fromWei(balanceFarmTokenAfterAccounts0.toString())
77  )
78  console.log(
79    "Balance FarmToken After TokenFarm " +
80      web3.utils.fromWei(balanceFarmTokenAfterFarmToken.toString())
81  )
82
83  // End function
84  callback()
85}
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1const MyToken = artifacts.require("MyToken")
2const FarmToken = artifacts.require("FarmToken")
3
4module.exports = async function (callback) {
5  const accounts = await new web3.eth.getAccounts()
6  const myToken = await MyToken.deployed()
7  const farmToken = await FarmToken.deployed()
8
9  // Verify accounts[0] and farmToken balance of MyToken before and after the transfer
10  balanceMyTokenBeforeAccounts0 = await myToken.balanceOf(accounts[0])
11  balanceMyTokenBeforeFarmToken = await myToken.balanceOf(farmToken.address)
12  console.log("*** My Token ***")
13  console.log(
14    "Balance MyToken Before accounts[0] " +
15      web3.utils.fromWei(balanceMyTokenBeforeAccounts0.toString())
16  )
17  console.log(
18    "Balance MyToken Before TokenFarm " +
19      web3.utils.fromWei(balanceMyTokenBeforeFarmToken.toString())
20  )
21
22  console.log("*** Farm Token ***")
23  balanceFarmTokenBeforeAccounts0 = await farmToken.balanceOf(accounts[0])
24  balanceFarmTokenBeforeFarmToken = await farmToken.balanceOf(farmToken.address)
25  console.log(
26    "Balance FarmToken Before accounts[0] " +
27      web3.utils.fromWei(balanceFarmTokenBeforeAccounts0.toString())
28  )
29  console.log(
30    "Balance FarmToken Before TokenFarm " +
31      web3.utils.fromWei(balanceFarmTokenBeforeFarmToken.toString())
32  )
33
34  // Call Deposit function from FarmToken
35  console.log("Call Withdraw Function")
36  await farmToken.withdraw(web3.utils.toWei("100", "ether"))
37
38  console.log("*** My Token ***")
39  balanceMyTokenAfterAccounts0 = await myToken.balanceOf(accounts[0])
40  balanceMyTokenAfterFarmToken = await myToken.balanceOf(farmToken.address)
41  console.log(
42    "Balance MyToken After accounts[0] " +
43      web3.utils.fromWei(balanceMyTokenAfterAccounts0.toString())
44  )
45  console.log(
46    "Balance MyToken After TokenFarm " +
47      web3.utils.fromWei(balanceMyTokenAfterFarmToken.toString())
48  )
49
50  console.log("*** Farm Token ***")
51  balanceFarmTokenAfterAccounts0 = await farmToken.balanceOf(accounts[0])
52  balanceFarmTokenAfterFarmToken = await farmToken.balanceOf(farmToken.address)
53  console.log(
54    "Balance FarmToken After accounts[0] " +
55      web3.utils.fromWei(balanceFarmTokenAfterAccounts0.toString())
56  )
57  console.log(
58    "Balance FarmToken After TokenFarm " +
59      web3.utils.fromWei(balanceFarmTokenAfterFarmToken.toString())
60  )
61
62  // End function
63  callback()
64}
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