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25 lines
997 B
25 lines
997 B
3 years ago
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import * as ethers from 'ethers';
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import * as optimismContracts from '@eth-optimism/contracts';
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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 = optimismContracts
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.getContractFactory('OVM_GasPriceOracle')
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.attach(optimismContracts.predeploys.OVM_GasPriceOracle);
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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 = buildUnserializedTransaction(
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txMeta,
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).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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