metamask-extension/ui/app/hooks/useCancelTransaction.js

import { useDispatch, useSelector } from 'react-redux'
import { useCallback } from 'react'
import { showModal } from '../store/actions'
import { isBalanceSufficient } from '../pages/send/send.utils'
import { getHexGasTotal, increaseLastGasPrice } from '../helpers/utils/confirm-tx.util'
import { getConversionRate, getSelectedAccount } from '../selectors'


/**
 * Determine whether a transaction can be cancelled and provide a method to
 * kick off the process of cancellation.
 *
 * Provides a reusable hook that, given a transactionGroup, will return
 * whether or not the account has enough funds to cover the gas cancellation
 * fee, and a method for beginning the cancellation process
 * @param {Object} transactionGroup
 * @return {[boolean, Function]}
 */
export function useCancelTransaction (transactionGroup) {
  const { primaryTransaction, initialTransaction } = transactionGroup
  const gasPrice = primaryTransaction.txParams?.gasPrice
  const { id } = initialTransaction
  const dispatch = useDispatch()
  const selectedAccount = useSelector(getSelectedAccount)
  const conversionRate = useSelector(getConversionRate)
  const cancelTransaction = useCallback((event) => {
    event.stopPropagation()

    return dispatch(showModal({ name: 'CANCEL_TRANSACTION', transactionId: id, originalGasPrice: gasPrice }))
  }, [dispatch, id, gasPrice])


  const hasEnoughCancelGas = primaryTransaction.txParams && isBalanceSufficient({
    amount: '0x0',
    gasTotal: getHexGasTotal({
      gasPrice: increaseLastGasPrice(gasPrice),
      gasLimit: primaryTransaction.txParams.gas,
    }),
    balance: selectedAccount.balance,
    conversionRate,
  })

  return [hasEnoughCancelGas, cancelTransaction]
}