로컬 네트워크에 erc20 토큰 배포(truffle)

ganache-cli 로 로컬 네트워크 생성

ganache-cli --db ~/dev/blockchain/ganacheDB -m "stereo consider quality wild fat farm symptom bundle laundry side one lemon" -i 1640314894363

• ganache를 재실행하면 이전에 배포해놓은 컨트랙트들이 리셋되는 것을 방지하고자 db와 chain id 옵션을 주었다.
• 지갑 주소를 고정하기 위해서 mnemonic 옵션을 사용했다.

truffle을 이용해서 erc20 토큰 배포

• truffle init 으로 트러플 프로젝트 생성

// erc20 토큰 컨트랙트 코드
// contracts/SimpleToken.sol

// SPDX-License-Identifier: GPL-3.0
pragma solidity 0.8.10;

interface ERC20Interface {
    function totalSupply() external view returns (uint256);

    function balanceOf(address account) external view returns (uint256);

    function transfer(address recipient, uint256 amount)
        external
        returns (bool);

    function approve(address spender, uint256 amount) external returns (bool);

    function allowance(address owner, address spender)
        external
        view
        returns (uint256);

    function transferFrom(
        address spender,
        address recipient,
        uint256 amount
    ) external returns (bool);

    event Transfer(address indexed from, address indexed to, uint256 amount);
    event Transfer(
        address indexed spender,
        address indexed from,
        address indexed to,
        uint256 amount
    );
    event Approval(
        address indexed owner,
        address indexed spender,
        uint256 oldAmount,
        uint256 amount
    );
}

contract SimpleToken is ERC20Interface {
    mapping(address => uint256) private _balances;
    mapping(address => mapping(address => uint256)) public _allowances;

    uint256 public _totalSupply;
    string public _name;
    string public _symbol;
    uint8 public _decimals;

    constructor(string memory getName, string memory getSymbol) {
        _name = getName;
        _symbol = getSymbol;
        _decimals = 18;
        _totalSupply = 100000000e18;
        _balances[msg.sender] = _totalSupply;
    }

    function name() public view returns (string memory) {
        return _name;
    }

    function symbol() public view returns (string memory) {
        return _symbol;
    }

    function decimals() public view returns (uint8) {
        return _decimals;
    }

    function totalSupply() external view virtual override returns (uint256) {
        return _totalSupply;
    }

    function balanceOf(address account)
        external
        view
        virtual
        override
        returns (uint256)
    {
        return _balances[account];
    }

    function transfer(address recipient, uint256 amount)
        public
        virtual
        override
        returns (bool)
    {
        _transfer(msg.sender, recipient, amount);
        emit Transfer(msg.sender, recipient, amount);
        return true;
    }

    function allowance(address owner, address spender)
        external
        view
        override
        returns (uint256)
    {
        return _allowances[owner][spender];
    }

    function approve(address spender, uint256 amount)
        external
        virtual
        override
        returns (bool)
    {
        uint256 currentAllownace = _allowances[msg.sender][spender];
        require(
            currentAllownace >= amount,
            "ERC20: Transfer amount exceeds allowance"
        );
        _approve(msg.sender, spender, currentAllownace, amount);
        return true;
    }

    function transferFrom(
        address sender,
        address recipient,
        uint256 amount
    ) external virtual override returns (bool) {
        _transfer(sender, recipient, amount);
        emit Transfer(msg.sender, sender, recipient, amount);
        uint256 currentAllowance = _allowances[sender][msg.sender];
        require(
            currentAllowance >= amount,
            "ERC20: transfer amount exceeds allowance"
        );
        _approve(
            sender,
            msg.sender,
            currentAllowance,
            currentAllowance - amount
        );
        return true;
    }

    function _transfer(
        address sender,
        address recipient,
        uint256 amount
    ) internal virtual {
        require(sender != address(0), "ERC20: transfer from the zero address");
        require(recipient != address(0), "ERC20: transfer to the zero address");
        uint256 senderBalance = _balances[sender];
        require(
            senderBalance >= amount,
            "ERC20: transfer amount exceeds balance"
        );
        _balances[sender] = senderBalance - amount;
        _balances[recipient] += amount;
    }

    function _approve(
        address owner,
        address spender,
        uint256 currentAmount,
        uint256 amount
    ) internal virtual {
        require(owner != address(0), "ERC20: approve from the zero address");
        require(spender != address(0), "ERC20: approve to the zero address");
        require(
            currentAmount == _allowances[owner][spender],
            "ERC20: invalid currentAmount"
        );
        _allowances[owner][spender] = amount;
        emit Approval(owner, spender, currentAmount, amount);
    }
}

• truffle compile 명령어로 컨트랙트 컴파일 => build 디렉토리 생성

// 배포 스크립트
// scripts/2_deploy_contracts.js

var simpleToken = artifacts.require("SimpleToken");
module.exports = function (deployer) {
  deployer.deploy(simpleToken, "SimpleToken", "SMT");
};

// truffle-config.js
module.exports = { 
  networks: {
    development: {
      host: "127.0.0.1",
      port: 8545,
      network_id: "*",
    }
  }
};

• truffle migrate 명령어로 development 네트워크(ganache 네트워크)에 컨트랙트 배포

truffle 콘솔에서 배포된 erc20 토큰 확인

• truffle console --network development 명령어로 네트워크 접속

let tokenContract = await SimpleToken.deployed()

• tokenContract.address로 컨트랙트 주소를 얻을 수 있다.