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)
  })