mirror of
https://github.com/kremalicious/metamask-extension.git
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295 lines
11 KiB
JavaScript
295 lines
11 KiB
JavaScript
import { addHexPrefix } from 'ethereumjs-util';
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import abi from 'human-standard-token-abi';
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import { GAS_LIMITS, MIN_GAS_LIMIT_HEX } from '../../../shared/constants/gas';
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import { calcTokenAmount } from '../../../shared/lib/transactions-controller-utils';
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import { CHAIN_ID_TO_GAS_LIMIT_BUFFER_MAP } from '../../../shared/constants/network';
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import {
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AssetType,
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TransactionEnvelopeType,
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} from '../../../shared/constants/transaction';
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import { readAddressAsContract } from '../../../shared/modules/contract-utils';
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import {
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conversionUtil,
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multiplyCurrencies,
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} from '../../../shared/modules/conversion.utils';
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import { ETH, GWEI } from '../../helpers/constants/common';
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import {
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addGasBuffer,
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generateERC20TransferData,
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generateERC721TransferData,
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getAssetTransferData,
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} from '../../pages/send/send.utils';
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import { getGasPriceInHexWei } from '../../selectors';
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import { estimateGas } from '../../store/actions';
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export async function estimateGasLimitForSend({
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selectedAddress,
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value,
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gasPrice,
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sendToken,
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to,
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data,
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isNonStandardEthChain,
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chainId,
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gasLimit,
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...options
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}) {
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let isSimpleSendOnNonStandardNetwork = false;
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// blockGasLimit may be a falsy, but defined, value when we receive it from
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// state, so we use logical or to fall back to MIN_GAS_LIMIT_HEX. Some
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// network implementations check the gas parameter supplied to
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// eth_estimateGas for validity. For this reason, we set token sends
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// blockGasLimit default to a higher number. Note that the current gasLimit
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// on a BLOCK is 15,000,000 and will be 30,000,000 on mainnet after London.
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// Meanwhile, MIN_GAS_LIMIT_HEX is 0x5208.
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let blockGasLimit = MIN_GAS_LIMIT_HEX;
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if (options.blockGasLimit) {
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blockGasLimit = options.blockGasLimit;
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} else if (sendToken) {
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blockGasLimit = GAS_LIMITS.BASE_TOKEN_ESTIMATE;
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}
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// The parameters below will be sent to our background process to estimate
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// how much gas will be used for a transaction. That background process is
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// located in tx-gas-utils.js in the transaction controller folder.
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const paramsForGasEstimate = { from: selectedAddress, value, gasPrice };
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if (sendToken) {
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if (!to) {
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// If no to address is provided, we cannot generate the token transfer
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// hexData. hexData in a transaction largely dictates how much gas will
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// be consumed by a transaction. We must use our best guess, which is
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// represented in the gas shared constants.
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return GAS_LIMITS.BASE_TOKEN_ESTIMATE;
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}
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paramsForGasEstimate.value = '0x0';
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// We have to generate the erc20/erc721 contract call to transfer tokens in
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// order to get a proper estimate for gasLimit.
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paramsForGasEstimate.data = getAssetTransferData({
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sendToken,
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fromAddress: selectedAddress,
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toAddress: to,
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amount: value,
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});
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paramsForGasEstimate.to = sendToken.address;
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} else {
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if (!data) {
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// eth.getCode will return the compiled smart contract code at the
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// address. If this returns 0x, 0x0 or a nullish value then the address
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// is an externally owned account (NOT a contract account). For these
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// types of transactions the gasLimit will always be 21,000 or 0x5208
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const { isContractAddress } = to
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? await readAddressAsContract(global.eth, to)
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: {};
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if (!isContractAddress && !isNonStandardEthChain) {
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return GAS_LIMITS.SIMPLE;
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} else if (!isContractAddress && isNonStandardEthChain) {
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isSimpleSendOnNonStandardNetwork = true;
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}
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}
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paramsForGasEstimate.data = data;
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if (to) {
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paramsForGasEstimate.to = to;
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}
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if (!value || value === '0') {
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// TODO: Figure out what's going on here. According to eth_estimateGas
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// docs this value can be zero, or undefined, yet we are setting it to a
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// value here when the value is undefined or zero. For more context:
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// https://github.com/MetaMask/metamask-extension/pull/6195
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paramsForGasEstimate.value = '0xff';
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}
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}
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if (!isSimpleSendOnNonStandardNetwork) {
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// If we do not yet have a gasLimit, we must call into our background
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// process to get an estimate for gasLimit based on known parameters.
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paramsForGasEstimate.gas = addHexPrefix(
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multiplyCurrencies(blockGasLimit, 0.95, {
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multiplicandBase: 16,
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multiplierBase: 10,
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roundDown: '0',
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toNumericBase: 'hex',
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}),
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);
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}
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// The buffer multipler reduces transaction failures by ensuring that the
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// estimated gas is always sufficient. Without the multiplier, estimates
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// for contract interactions can become inaccurate over time. This is because
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// gas estimation is non-deterministic. The gas required for the exact same
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// transaction call can change based on state of a contract or changes in the
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// contracts environment (blockchain data or contracts it interacts with).
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// Applying the 1.5 buffer has proven to be a useful guard against this non-
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// deterministic behaviour.
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//
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// Gas estimation of simple sends should, however, be deterministic. As such
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// no buffer is needed in those cases.
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let bufferMultiplier = 1.5;
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if (isSimpleSendOnNonStandardNetwork) {
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bufferMultiplier = 1;
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} else if (CHAIN_ID_TO_GAS_LIMIT_BUFFER_MAP[chainId]) {
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bufferMultiplier = CHAIN_ID_TO_GAS_LIMIT_BUFFER_MAP[chainId];
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}
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try {
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// Call into the background process that will simulate transaction
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// execution on the node and return an estimate of gasLimit
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const estimatedGasLimit = await estimateGas(paramsForGasEstimate);
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const estimateWithBuffer = addGasBuffer(
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estimatedGasLimit,
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blockGasLimit,
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bufferMultiplier,
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);
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return addHexPrefix(estimateWithBuffer);
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} catch (error) {
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const simulationFailed =
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error.message.includes('Transaction execution error.') ||
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error.message.includes(
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'gas required exceeds allowance or always failing transaction',
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) ||
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(CHAIN_ID_TO_GAS_LIMIT_BUFFER_MAP[chainId] &&
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error.message.includes('gas required exceeds allowance'));
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if (simulationFailed) {
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const estimateWithBuffer = addGasBuffer(
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paramsForGasEstimate?.gas ?? gasLimit,
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blockGasLimit,
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bufferMultiplier,
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);
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return addHexPrefix(estimateWithBuffer);
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}
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throw error;
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}
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}
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/**
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* Generates a txParams from the send slice.
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*
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* @param {import('.').SendState} sendState - the state of the send slice
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* @returns {import(
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* '../../../shared/constants/transaction'
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* ).TxParams} A txParams object that can be used to create a transaction or
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* update an existing transaction.
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*/
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export function generateTransactionParams(sendState) {
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const draftTransaction =
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sendState.draftTransactions[sendState.currentTransactionUUID];
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const txParams = {
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// If the fromAccount has been specified we use that, if not we use the
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// selected account.
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from:
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draftTransaction.fromAccount?.address ||
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sendState.selectedAccount.address,
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// gasLimit always needs to be set regardless of the asset being sent
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// or the type of transaction.
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gas: draftTransaction.gas.gasLimit,
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};
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switch (draftTransaction.asset.type) {
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case AssetType.token:
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// When sending a token the to address is the contract address of
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// the token being sent. The value is set to '0x0' and the data
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// is generated from the recipient address, token being sent and
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// amount.
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txParams.to = draftTransaction.asset.details.address;
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txParams.value = '0x0';
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txParams.data = generateERC20TransferData({
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toAddress: draftTransaction.recipient.address,
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amount: draftTransaction.amount.value,
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sendToken: draftTransaction.asset.details,
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});
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break;
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case AssetType.NFT:
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// When sending a token the to address is the contract address of
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// the token being sent. The value is set to '0x0' and the data
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// is generated from the recipient address, token being sent and
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// amount.
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txParams.to = draftTransaction.asset.details.address;
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txParams.value = '0x0';
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txParams.data = generateERC721TransferData({
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toAddress: draftTransaction.recipient.address,
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fromAddress:
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draftTransaction.fromAccount?.address ??
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sendState.selectedAccount.address,
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tokenId: draftTransaction.asset.details.tokenId,
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});
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break;
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case AssetType.native:
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default:
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// When sending native currency the to and value fields use the
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// recipient and amount values and the data key is either null or
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// populated with the user input provided in hex field.
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txParams.to = draftTransaction.recipient.address;
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txParams.value = draftTransaction.amount.value;
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txParams.data = draftTransaction.userInputHexData ?? undefined;
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}
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// We need to make sure that we only include the right gas fee fields
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// based on the type of transaction the network supports. We will also set
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// the type param here.
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if (sendState.eip1559support) {
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txParams.type = TransactionEnvelopeType.feeMarket;
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txParams.maxFeePerGas = draftTransaction.gas.maxFeePerGas;
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txParams.maxPriorityFeePerGas = draftTransaction.gas.maxPriorityFeePerGas;
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if (!txParams.maxFeePerGas || txParams.maxFeePerGas === '0x0') {
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txParams.maxFeePerGas = draftTransaction.gas.gasPrice;
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}
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if (
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!txParams.maxPriorityFeePerGas ||
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txParams.maxPriorityFeePerGas === '0x0'
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) {
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txParams.maxPriorityFeePerGas = txParams.maxFeePerGas;
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}
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} else {
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txParams.gasPrice = draftTransaction.gas.gasPrice;
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txParams.type = TransactionEnvelopeType.legacy;
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}
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return txParams;
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}
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/**
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* This method is used to keep the original logic from the gas.duck.js file
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* after receiving a gasPrice from eth_gasPrice. First, the returned gasPrice
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* was converted to GWEI, then it was converted to a Number, then in the send
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* duck (here) we would use getGasPriceInHexWei to get back to hexWei. Now that
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* we receive a GWEI estimate from the controller, we still need to do this
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* weird conversion to get the proper rounding.
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*
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* @param {string} gasPriceEstimate
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* @returns {string}
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*/
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export function getRoundedGasPrice(gasPriceEstimate) {
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const gasPriceInDecGwei = conversionUtil(gasPriceEstimate, {
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numberOfDecimals: 9,
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toDenomination: GWEI,
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fromNumericBase: 'dec',
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toNumericBase: 'dec',
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fromCurrency: ETH,
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fromDenomination: GWEI,
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});
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const gasPriceAsNumber = Number(gasPriceInDecGwei);
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return getGasPriceInHexWei(gasPriceAsNumber);
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}
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export async function getERC20Balance(token, accountAddress) {
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const contract = global.eth.contract(abi).at(token.address);
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const usersToken = (await contract.balanceOf(accountAddress)) ?? null;
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if (!usersToken) {
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return '0x0';
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}
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const amount = calcTokenAmount(
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usersToken.balance.toString(),
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token.decimals,
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).toString(16);
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return addHexPrefix(amount);
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}
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