mirror of
https://github.com/kremalicious/metamask-extension.git
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48 lines
1.5 KiB
JavaScript
48 lines
1.5 KiB
JavaScript
import { Contract } from '@ethersproject/contracts';
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import { Web3Provider } from '@ethersproject/providers';
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import buildUnserializedTransaction from './buildUnserializedTransaction';
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// Snippet of the ABI that we need
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// Should we need more of it at some point, the full ABI can be found here:
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// https://github.com/ethereum-optimism/optimism/blob/develop/gas-oracle/abis/OVM_GasPriceOracle.json
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const OPTIMISM_GAS_PRICE_ORACLE_ABI = [
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{
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inputs: [{ internalType: 'bytes', name: '_data', type: 'bytes' }],
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name: 'getL1Fee',
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outputs: [{ internalType: 'uint256', name: '', type: 'uint256' }],
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stateMutability: 'view',
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type: 'function',
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},
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];
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// BlockExplorer link: https://optimistic.etherscan.io/address/0x420000000000000000000000000000000000000f#code
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const OPTIMISM_GAS_PRICE_ORACLE_ADDRESS =
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'0x420000000000000000000000000000000000000F';
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export default async function fetchEstimatedL1Fee(
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chainId,
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txMeta,
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ethersProvider,
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) {
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const networkId = Number(chainId);
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const provider = global.ethereumProvider
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? new Web3Provider(global.ethereumProvider, networkId)
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: ethersProvider;
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if (process.env.IN_TEST) {
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provider.detectNetwork = async () => ({
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name: 'optimism',
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chainId: networkId,
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});
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}
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const contract = new Contract(
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OPTIMISM_GAS_PRICE_ORACLE_ADDRESS,
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OPTIMISM_GAS_PRICE_ORACLE_ABI,
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provider,
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);
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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?.toHexString();
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}
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