exit-eth.js

/*
  Copyright 2019 OmiseGO Pte Ltd

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
*/

const Web3 = require('web3')
const RootChain = require('../packages/omg-js-rootchain/src/rootchain')
const ChildChain = require('../packages/omg-js-childchain/src/childchain')
const { transaction, waitForRootchainTransaction } = require('../packages/omg-js-util/src')

const config = require('./config.js')
const wait = require('./wait.js')
const getFlags = require('./parse-args')

const web3 = new Web3(new Web3.providers.HttpProvider(config.eth_node), null, { transactionConfirmationBlocks: 1 })
const rootChain = new RootChain({ web3, plasmaContractAddress: config.plasmaframework_contract_address })
const childChain = new ChildChain({ watcherUrl: config.watcher_url, watcherProxyUrl: config.watcher_proxy_url, plasmaContractAddress: config.plasmaframework_contract_address })

async function logBalances (address) {
  const rootchainBalance = await web3.eth.getBalance(address)
  const childchainBalanceArray = await childChain.getBalance(address)
  const ethObject = childchainBalanceArray.find(i => i.currency === transaction.ETH_CURRENCY)
  const childchainEthBalance = ethObject
    ? `${web3.utils.fromWei(String(ethObject.amount))} ETH`
    : '0 ETH'

  console.log(`Rootchain balance: ${web3.utils.fromWei(String(rootchainBalance), 'ether')} ETH`)
  console.log(`Childchain balance: ${childchainEthBalance}`)
}

async function exitEth () {
  try {
    const { owner } = getFlags('owner')
    const address = config[`${owner}_eth_address`]
    const pk = config[`${owner}_eth_address_private_key`]

    const rootchainBalance = await web3.eth.getBalance(address)
    const etherBalance = web3.utils.fromWei(String(rootchainBalance), 'ether')
    if (etherBalance < 0.001) {
      console.log(`${owner} does not have enough ETH on the rootchain to start an exit`)
      return
    }
    await logBalances(address)
    console.log('-----')

    // get ETH UTXO and exit data
    const utxos = await childChain.getUtxos(address)
    const utxoToExit = utxos.find(i => i.currency === transaction.ETH_CURRENCY)
    if (!utxoToExit) {
      console.log(`${owner} doesnt have any ETH UTXOs to exit`)
      return
    }

    console.log(`${owner} wants to exit ${web3.utils.fromWei(String(utxoToExit.amount), 'ether')} ETH with this UTXO:\n${JSON.stringify(utxoToExit, undefined, 2)}`)

    // check if queue exists for this token
    const hasToken = await rootChain.hasToken(transaction.ETH_CURRENCY)
    if (!hasToken) {
      console.log(`Adding a ${transaction.ETH_CURRENCY} exit queue`)
      await rootChain.addToken({
        token: transaction.ETH_CURRENCY,
        txOptions: { from: address, privateKey: pk }
      })
    }

    // start a standard exit
    const exitData = await childChain.getExitData(utxoToExit)

    const standardExitReceipt = await rootChain.startStandardExit({
      utxoPos: exitData.utxo_pos,
      outputTx: exitData.txbytes,
      inclusionProof: exitData.proof,
      txOptions: {
        privateKey: pk,
        from: address
      }
    })
    console.log('Started a standard exit: ', standardExitReceipt.transactionHash)

    const exitId = await rootChain.getStandardExitId({
      txBytes: exitData.txbytes,
      utxoPos: exitData.utxo_pos,
      isDeposit: utxoToExit.blknum % 1000 !== 0
    })
    console.log('Exit id: ', exitId)

    const { msUntilFinalization } = await rootChain.getExitTime({
      exitRequestBlockNumber: standardExitReceipt.blockNumber,
      submissionBlockNumber: utxoToExit.blknum
    })

    await wait.wait(msUntilFinalization)
    const processExitReceipt = await rootChain.processExits({
      token: transaction.ETH_CURRENCY,
      exitId: 0,
      maxExitsToProcess: 20,
      txOptions: {
        privateKey: pk,
        from: address
      }
    })
    if (processExitReceipt) {
      console.log(`ETH exits processing: ${processExitReceipt.transactionHash}`)
      await waitForRootchainTransaction({
        web3,
        transactionHash: processExitReceipt.transactionHash,
        checkIntervalMs: config.millis_to_wait_for_next_block,
        blocksToWait: config.blocks_to_wait_for_txn,
        onCountdown: (remaining) => console.log(`${remaining} blocks remaining before confirmation`)
      })
    }
    console.log('Exits processed')

    console.log('-----')
    await logBalances(address)
  } catch (error) {
    console.log('Error: ', error.message)
  }
}

exitEth()