optimism-bridge-snt/index.js

const contracts = require("./contracts.json");
const ethers = require("ethers");
const optimismSDK = require("@eth-optimism/sdk");
require("dotenv").config();

const l1Url = `https://eth-goerli.g.alchemy.com/v2/${process.env.GOERLI_ALCHEMY_KEY}`;
const l2Url = `https://opt-goerli.g.alchemy.com/v2/${process.env.GOERLI_OPT_ALCHEMY_KEY}`;
const mnemonic = process.env.GOERLI_MNEMONIC;

const words = mnemonic.match(/[a-zA-Z]+/g).length;
validLength = [12, 15, 18, 24];
if (!validLength.includes(words)) {
  console.log(`The mnemonic (${mnemonic}) is the wrong number of words`);
  process.exit(-1);
}

const erc20Addrs = {
  l1Addr: contracts.goerli.l1.token,
  l2Addr: contracts.goerli.l2.token,
};
const faucetAddr = contracts.goerli.l2.controller;

let crossChainMessenger;
let l1ERC20, l2ERC20; // OUTb contracts to show ERC-20
let faucet;
let ourAddr; // The address of the signer we use.

// Get signers on L1 and L2 (for the same address). Note that
// this address needs to have ETH on it, both on Optimism and
// Optimism Georli
const getSigners = async () => {
  const l1RpcProvider = new ethers.providers.JsonRpcProvider(l1Url);
  const l2RpcProvider = new ethers.providers.JsonRpcProvider(l2Url);
  const hdNode = ethers.utils.HDNode.fromMnemonic(mnemonic);
  const privateKey = hdNode.derivePath(ethers.utils.defaultPath).privateKey;
  const l1Wallet = new ethers.Wallet(privateKey, l1RpcProvider);
  const l2Wallet = new ethers.Wallet(privateKey, l2RpcProvider);

  return [l1Wallet, l2Wallet];
}; // getSigners

// The ABI fragment for the contract. We only need to know how to do two things:
// 1. Get an account's balance
// 2. Call the faucet to get more (only works on L1). Of course, production
//    ERC-20 tokens tend to be a bit harder to acquire.
const erc20ABI = [
  // balanceOf
  {
    constant: true,
    inputs: [{ name: "_owner", type: "address" }],
    name: "balanceOf",
    outputs: [{ name: "balance", type: "uint256" }],
    type: "function",
  },
]; // erc20ABI
const faucetABI = [
  // faucet
  {
    inputs: [
      {
        internalType: "uint256",
        name: "_amount",
        type: "uint256",
      },
    ],
    name: "mint",
    outputs: [],
    stateMutability: "nonpayable",
    type: "function",
  },
];

const setup = async () => {
  const [l1Signer, l2Signer] = await getSigners();
  ourAddr = l1Signer.address;
  crossChainMessenger = new optimismSDK.CrossChainMessenger({
    l1ChainId: 5, // Goerli value, 1 for mainnet
    l2ChainId: 420, // Goerli value, 10 for mainnet
    l1SignerOrProvider: l1Signer,
    l2SignerOrProvider: l2Signer,
  });
  l1ERC20 = new ethers.Contract(erc20Addrs.l1Addr, erc20ABI, l1Signer);
  l2ERC20 = new ethers.Contract(erc20Addrs.l2Addr, erc20ABI, l2Signer);
  faucet = new ethers.Contract(faucetAddr, faucetABI, l1Signer);
};

const reportERC20Balances = async () => {
  const l1Balance = (await l1ERC20.balanceOf(ourAddr)).toString().slice(0, -18);
  const l2Balance = (await l2ERC20.balanceOf(ourAddr)).toString().slice(0, -18);
  console.log(`OUTb on L1:${l1Balance}     OUTb on L2:${l2Balance}`);

  if (l1Balance != 0) {
    return;
  }

  console.log(`You don't have enough OUTb on L1. Let's call the faucet to fix that`);
  const tx = await faucet.mint("10000000000000000000000");
  console.log(`Faucet tx: ${tx.hash}`);
  console.log(`\tMore info: https://goerli.etherscan.io/tx/${tx.hash}`);
  await tx.wait();
  const newBalance = (await l1ERC20.balanceOf(ourAddr)).toString().slice(0, -18);
  console.log(`New L1 OUTb balance: ${newBalance}`);
};

const oneToken = BigInt(1e18);

const depositERC20 = async () => {
  console.log("Deposit ERC20");
  await reportERC20Balances();
  const start = new Date();

  // Need the l2 address to know which bridge is responsible
  const allowanceResponse = await crossChainMessenger.approveERC20(erc20Addrs.l1Addr, erc20Addrs.l2Addr, oneToken);
  await allowanceResponse.wait();
  console.log(`Allowance given by tx ${allowanceResponse.hash}`);
  console.log(`\tMore info: https://goerli.etherscan.io/tx/${allowanceResponse.hash}`);
  console.log(`Time so far ${(new Date() - start) / 1000} seconds`);

  const response = await crossChainMessenger.depositERC20(erc20Addrs.l1Addr, erc20Addrs.l2Addr, oneToken);
  console.log(`Deposit transaction hash (on L1): ${response.hash}`);
  console.log(`\tMore info: https://goerli.etherscan.io/tx/${response.hash}`);
  await response.wait();
  console.log("Waiting for status to change to RELAYED");
  console.log(`Time so far ${(new Date() - start) / 1000} seconds`);
  await crossChainMessenger.waitForMessageStatus(response.hash, optimismSDK.MessageStatus.RELAYED);

  await reportERC20Balances();
  console.log(`depositERC20 took ${(new Date() - start) / 1000} seconds\n\n`);
}; // depositERC20()

const withdrawERC20 = async () => {
  console.log("Withdraw ERC20");
  const start = new Date();
  await reportERC20Balances();

  const response = await crossChainMessenger.withdrawERC20(erc20Addrs.l1Addr, erc20Addrs.l2Addr, oneToken);
  console.log(`Transaction hash (on L2): ${response.hash}`);
  console.log(`\tFor more information: https://goerli-optimism.etherscan.io/tx/${response.hash}`);
  await response.wait();

  console.log("Waiting for status to be READY_TO_PROVE");
  console.log(`Time so far ${(new Date() - start) / 1000} seconds`);
  await crossChainMessenger.waitForMessageStatus(response.hash, optimismSDK.MessageStatus.READY_TO_PROVE);
  console.log(`Time so far ${(new Date() - start) / 1000} seconds`);
  await crossChainMessenger.proveMessage(response.hash);

  console.log("In the challenge period, waiting for status READY_FOR_RELAY");
  console.log(`Time so far ${(new Date() - start) / 1000} seconds`);
  await crossChainMessenger.waitForMessageStatus(response.hash, optimismSDK.MessageStatus.READY_FOR_RELAY);
  console.log("Ready for relay, finalizing message now");
  console.log(`Time so far ${(new Date() - start) / 1000} seconds`);
  await crossChainMessenger.finalizeMessage(response.hash);

  console.log("Waiting for status to change to RELAYED");
  console.log(`Time so far ${(new Date() - start) / 1000} seconds`);
  await crossChainMessenger.waitForMessageStatus(response, optimismSDK.MessageStatus.RELAYED);
  await reportERC20Balances();
  console.log(`withdrawERC20 took ${(new Date() - start) / 1000} seconds\n\n\n`);
}; // withdrawERC20()

const main = async () => {
  await setup();
  await depositERC20();
  await withdrawERC20();
}; // main

main()
  .then(() => process.exit(0))
  .catch((error) => {
    console.error(error);
    process.exit(1);
  });