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?.startsWith('-')
    ? '0x0'
    : 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]
}