mirror of
https://github.com/kremalicious/metamask-extension.git
synced 2024-10-23 03:36:18 +02:00
25 lines
1.0 KiB
JavaScript
25 lines
1.0 KiB
JavaScript
import * as ethers from 'ethers';
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import { getContractFactory } from '@eth-optimism/contracts/dist/contract-defs';
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import { predeploys } from '@eth-optimism/contracts/dist/predeploys';
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import buildUnserializedTransaction from './buildUnserializedTransaction';
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// The code in this file is largely drawn from https://community.optimism.io/docs/developers/l2/new-fees.html#for-frontend-and-wallet-developers
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function buildOVMGasPriceOracleContract(eth) {
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const OVMGasPriceOracle = getContractFactory('OVM_GasPriceOracle').attach(
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predeploys.OVM_GasPriceOracle,
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);
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const abi = JSON.parse(
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OVMGasPriceOracle.interface.format(ethers.utils.FormatTypes.json),
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);
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return eth.contract(abi).at(OVMGasPriceOracle.address);
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}
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export default async function fetchEstimatedL1Fee(eth, txMeta) {
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const contract = buildOVMGasPriceOracleContract(eth);
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const serializedTransaction =
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buildUnserializedTransaction(txMeta).serialize();
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const result = await contract.getL1Fee(serializedTransaction);
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return result?.[0]?.toString(16);
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}
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