mirror of
https://github.com/kremalicious/metamask-extension.git
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116 lines
4.5 KiB
JavaScript
116 lines
4.5 KiB
JavaScript
import BigNumber from 'bignumber.js';
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import { addHexPrefix } from 'ethereumjs-util';
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import { useMemo } from 'react';
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import { multiplyCurrencies } from '../../shared/modules/conversion.utils';
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import { isEIP1559Transaction } from '../../shared/modules/transaction.utils';
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import { decGWEIToHexWEI } from '../helpers/utils/conversions.util';
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import { useGasFeeEstimates } from './useGasFeeEstimates';
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/**
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* Simple helper to save on duplication to multiply the supplied wei hex string
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* by 1.10 to get bare minimum new gas fee.
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*
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* @param {string} hexStringValue - hex value in wei to be incremented
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* @returns {string} - hex value in WEI 10% higher than the param.
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*/
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function addTenPercent(hexStringValue) {
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return addHexPrefix(
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multiplyCurrencies(hexStringValue, 1.1, {
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toNumericBase: 'hex',
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multiplicandBase: 16,
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multiplierBase: 10,
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}),
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);
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}
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/**
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* Helper that returns the higher of two options for a new gas fee:
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* The original fee + 10% or
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* the current medium suggested fee from our gas estimation api
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*
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* @param {string} originalFee - hexWei vale of the original fee (maxFee or maxPriority)
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* @param {string} currentEstimate - decGwei value of the current medium gasFee estimate (maxFee or maxPriorityfee)
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* @returns {string} - hexWei value of the higher of the two inputs.
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*/
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function getHighestIncrementedFee(originalFee, currentEstimate) {
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const buffedOriginalHexWei = addTenPercent(originalFee);
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const currentEstimateHexWei = decGWEIToHexWEI(currentEstimate);
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return new BigNumber(buffedOriginalHexWei, 16).greaterThan(
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new BigNumber(currentEstimateHexWei, 16),
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)
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? buffedOriginalHexWei
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: currentEstimateHexWei;
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}
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/**
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* When initializing cancellations or speed ups we need to set the baseline
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* gas fees to be 10% higher, which is the bare minimum that the network will
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* accept for transactions of the same nonce. Anything lower than this will be
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* discarded by the network to avoid DoS attacks. This hook returns an object
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* that either has gasPrice or maxFeePerGas/maxPriorityFeePerGas specified. In
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* addition the gasLimit will also be included.
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* @param {} transactionGroup
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* @returns {import(
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* '../../app/scripts/controllers/transactions'
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* ).CustomGasSettings} - Gas settings for cancellations/speed ups
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*/
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export function useIncrementedGasFees(transactionGroup) {
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const { primaryTransaction } = transactionGroup;
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const { gasFeeEstimates = {} } = useGasFeeEstimates();
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// We memoize this value so that it can be relied upon in other hooks.
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const customGasSettings = useMemo(() => {
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// This hook is called indiscriminantly on all transactions appearing in
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// the activity list. This includes transitional items such as signature
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// requests. These types of "transactions" are not really transactions and
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// do not have txParams. This is why we use optional chaining on the
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// txParams object in this hook.
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const temporaryGasSettings = {
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gasLimit: primaryTransaction.txParams?.gas,
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gas: primaryTransaction.txParams?.gas,
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};
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const suggestedMaxFeePerGas =
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gasFeeEstimates?.medium?.suggestedMaxFeePerGas ?? '0';
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const suggestedMaxPriorityFeePerGas =
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gasFeeEstimates?.medium?.suggestedMaxPriorityFeePerGas ?? '0';
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if (isEIP1559Transaction(primaryTransaction)) {
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const transactionMaxFeePerGas = primaryTransaction.txParams?.maxFeePerGas;
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const transactionMaxPriorityFeePerGas =
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primaryTransaction.txParams?.maxPriorityFeePerGas;
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temporaryGasSettings.maxFeePerGas =
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transactionMaxFeePerGas === undefined ||
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transactionMaxFeePerGas.startsWith('-')
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? '0x0'
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: getHighestIncrementedFee(
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transactionMaxFeePerGas,
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suggestedMaxFeePerGas,
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);
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temporaryGasSettings.maxPriorityFeePerGas =
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transactionMaxPriorityFeePerGas === undefined ||
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transactionMaxPriorityFeePerGas.startsWith('-')
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? '0x0'
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: getHighestIncrementedFee(
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transactionMaxPriorityFeePerGas,
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suggestedMaxPriorityFeePerGas,
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);
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} else {
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const transactionGasPrice = primaryTransaction.txParams?.gasPrice;
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temporaryGasSettings.gasPrice =
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transactionGasPrice === undefined || transactionGasPrice.startsWith('-')
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? '0x0'
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: getHighestIncrementedFee(
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transactionGasPrice,
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suggestedMaxFeePerGas,
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);
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}
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return temporaryGasSettings;
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}, [primaryTransaction, gasFeeEstimates]);
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return customGasSettings;
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}
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