1
0
mirror of https://github.com/kremalicious/metamask-extension.git synced 2024-12-04 23:14:56 +01:00
metamask-extension/ui/helpers/utils/optimism/fetchEstimatedL1Fee.js
2022-07-31 13:26:40 -05:00

25 lines
1.0 KiB
JavaScript

import * as ethers from 'ethers';
import { getContractFactory } from '@eth-optimism/contracts/dist/contract-defs';
import { predeploys } from '@eth-optimism/contracts/dist/predeploys';
import buildUnserializedTransaction from './buildUnserializedTransaction';
// The code in this file is largely drawn from https://community.optimism.io/docs/developers/l2/new-fees.html#for-frontend-and-wallet-developers
function buildOVMGasPriceOracleContract(eth) {
const OVMGasPriceOracle = getContractFactory('OVM_GasPriceOracle').attach(
predeploys.OVM_GasPriceOracle,
);
const abi = JSON.parse(
OVMGasPriceOracle.interface.format(ethers.utils.FormatTypes.json),
);
return eth.contract(abi).at(OVMGasPriceOracle.address);
}
export default async function fetchEstimatedL1Fee(eth, txMeta) {
const contract = buildOVMGasPriceOracleContract(eth);
const serializedTransaction =
buildUnserializedTransaction(txMeta).serialize();
const result = await contract.getL1Fee(serializedTransaction);
return result?.[0]?.toString(16);
}