Ethers.js-learing/read-contract.js at main · LucasToMoon/Ethers.js-learing · GitHub

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import { ethers } from "ethers";
import {} from 'dotenv/config';

const provider = new ethers.providers.JsonRpcProvider(`https://mainnet.infura.io/v3/${process.env.INFURA_ID}`);

const abiWETH = [{"constant":true,"inputs":[],"name":"name","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"guy","type":"address"},{"name":"wad","type":"uint256"}],"name":"approve","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"totalSupply","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"src","type":"address"},{"name":"dst","type":"address"},{"name":"wad","type":"uint256"}],"name":"transferFrom","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[{"name":"wad","type":"uint256"}],"name":"withdraw","outputs":[],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":true,"inputs":[],"name":"decimals","outputs":[{"name":"","type":"uint8"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"}],"name":"balanceOf","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":true,"inputs":[],"name":"symbol","outputs":[{"name":"","type":"string"}],"payable":false,"stateMutability":"view","type":"function"},{"constant":false,"inputs":[{"name":"dst","type":"address"},{"name":"wad","type":"uint256"}],"name":"transfer","outputs":[{"name":"","type":"bool"}],"payable":false,"stateMutability":"nonpayable","type":"function"},{"constant":false,"inputs":[],"name":"deposit","outputs":[],"payable":true,"stateMutability":"payable","type":"function"},{"constant":true,"inputs":[{"name":"","type":"address"},{"name":"","type":"address"}],"name":"allowance","outputs":[{"name":"","type":"uint256"}],"payable":false,"stateMutability":"view","type":"function"},{"payable":true,"stateMutability":"payable","type":"fallback"},{"anonymous":false,"inputs":[{"indexed":true,"name":"src","type":"address"},{"indexed":true,"name":"guy","type":"address"},{"indexed":false,"name":"wad","type":"uint256"}],"name":"Approval","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"src","type":"address"},{"indexed":true,"name":"dst","type":"address"},{"indexed":false,"name":"wad","type":"uint256"}],"name":"Transfer","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"dst","type":"address"},{"indexed":false,"name":"wad","type":"uint256"}],"name":"Deposit","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"name":"src","type":"address"},{"indexed":false,"name":"wad","type":"uint256"}],"name":"Withdrawal","type":"event"}];
const addressWETH = '0xc02aaa39b223fe8d0a0e5c4f27ead9083c756cc2'; // WETH Contract
const contractWETH = new ethers.Contract(addressWETH, abiWETH, provider);

const abiERC20 = [
    "function name() view returns (string)",
    "function symbol() view returns (string)",
    "function totalSupply() view returns (uint256)",
    "function balanceOf(address) view returns (uint)",
];
const addressDAI = '0x6B175474E89094C44Da98b954EedeAC495271d0F' // DAI Contract
const contractDAI = new ethers.Contract(addressDAI, abiERC20, provider)

const main = async () => {
    // 1. Read on-chain information from WETH contracts (WETH abi)
    const nameWETH = await contractWETH.name()
    const symbolWETH = await contractWETH.symbol()
    const totalSupplyWETH = await contractWETH.totalSupply()
    console.log("\n1. Read WETH contract information")
    console.log(`Contract address: ${addressWETH}`)
    console.log(`Name: ${nameWETH}`)
    console.log(`Symbol: ${symbolWETH}`)
    console.log(`TotalSupply: ${ethers.utils.formatEther(totalSupplyWETH)}`)
    const balanceWETH = await contractWETH.balanceOf('vitalik.eth')
    console.log(`Vitalik positions: ${ethers.utils.formatEther(balanceWETH)}\n`)

    // 2. Read on-chain information from DAI contracts (IERC20 interface contract)
    const nameDAI = await contractDAI.name()
    const symbolDAI = await contractDAI.symbol()
    const totalSupplDAI = await contractDAI.totalSupply()
    console.log("\n2. Read DAI  contract information")
    console.log(`Contract address: ${addressDAI}`)
    console.log(`Name: ${nameDAI}`)
    console.log(`Symbol: ${symbolDAI}`)
    console.log(`TotalSupply: ${ethers.utils.formatEther(totalSupplDAI)}`)
    const balanceDAI = await contractDAI.balanceOf('vitalik.eth')
    console.log(`Vitalik positions: ${ethers.utils.formatEther(balanceDAI)}\n`)
}

main()