@floyddd-vm/ethers-provider-bundle
Version:
This repository contains the `FlashbotsBundleProvider` ethers.js provider, an additional `Provider` to `ethers.js` to enable high-level access to `eth_sendBundle` and `eth_callBundle` rpc endpoint on [mev-relay](https://github.com/flashbots/mev-relay-js).
94 lines • 4.25 kB
JavaScript
;
Object.defineProperty(exports, "__esModule", { value: true });
const ethers_1 = require("ethers");
const index_1 = require("./index");
const FLASHBOTS_AUTH_KEY = process.env.FLASHBOTS_AUTH_KEY;
const GWEI = ethers_1.BigNumber.from(10).pow(9);
const PRIORITY_FEE = GWEI.mul(3);
const LEGACY_GAS_PRICE = GWEI.mul(12);
const BLOCKS_IN_THE_FUTURE = 2;
// ===== Uncomment this for mainnet =======
// const CHAIN_ID = 1
// const provider = new providers.JsonRpcProvider(
// { url: process.env.ETHEREUM_RPC_URL || 'http://127.0.0.1:8545' },
// { chainId: CHAIN_ID, ensAddress: '', name: 'mainnet' }
// )
// const FLASHBOTS_EP = undefined;
// ===== Uncomment this for mainnet =======
// ===== Uncomment this for Goerli =======
const CHAIN_ID = 5;
const provider = new ethers_1.providers.InfuraProvider(CHAIN_ID, process.env.INFURA_API_KEY);
const FLASHBOTS_EP = 'https://relay-goerli.flashbots.net/';
// ===== Uncomment this for Goerli =======
async function main() {
const authSigner = FLASHBOTS_AUTH_KEY ? new ethers_1.Wallet(FLASHBOTS_AUTH_KEY) : ethers_1.Wallet.createRandom();
const wallet = new ethers_1.Wallet(process.env.PRIVATE_KEY || '', provider);
const flashbotsProvider = await index_1.FlashbotsBundleProvider.create(provider, authSigner, FLASHBOTS_EP);
const legacyTransaction = {
to: wallet.address,
gasPrice: LEGACY_GAS_PRICE,
gasLimit: 21000,
data: '0x',
nonce: await provider.getTransactionCount(wallet.address)
};
provider.on('block', async (blockNumber) => {
const block = await provider.getBlock(blockNumber);
let eip1559Transaction;
if (block.baseFeePerGas == null) {
console.warn('This chain is not EIP-1559 enabled, defaulting to two legacy transactions for demo');
eip1559Transaction = { ...legacyTransaction };
// We set a nonce in legacyTransaction above to limit validity to a single landed bundle. Delete that nonce for tx#2, and allow bundle provider to calculate it
delete eip1559Transaction.nonce;
}
else {
const maxBaseFeeInFutureBlock = index_1.FlashbotsBundleProvider.getMaxBaseFeeInFutureBlock(block.baseFeePerGas, BLOCKS_IN_THE_FUTURE);
eip1559Transaction = {
to: wallet.address,
type: 2,
maxFeePerGas: PRIORITY_FEE.add(maxBaseFeeInFutureBlock),
maxPriorityFeePerGas: PRIORITY_FEE,
gasLimit: 21000,
data: '0x',
chainId: CHAIN_ID
};
}
const signedTransactions = await flashbotsProvider.signBundle([
{
signer: wallet,
transaction: legacyTransaction
},
{
signer: wallet,
transaction: eip1559Transaction
}
]);
const targetBlock = blockNumber + BLOCKS_IN_THE_FUTURE;
const simulation = await flashbotsProvider.simulate(signedTransactions, targetBlock);
// Using TypeScript discrimination
if ('error' in simulation) {
console.warn(`Simulation Error: ${simulation.error.message}`);
process.exit(1);
}
else {
console.log(`Simulation Success: ${JSON.stringify(simulation, null, 2)}`);
}
const bundleSubmission = await flashbotsProvider.sendRawBundle(signedTransactions, targetBlock);
console.log('bundle submitted, waiting');
if ('error' in bundleSubmission) {
throw new Error(bundleSubmission.error.message);
}
const waitResponse = await bundleSubmission.wait();
console.log(`Wait Response: ${index_1.FlashbotsBundleResolution[waitResponse]}`);
if (waitResponse === index_1.FlashbotsBundleResolution.BundleIncluded || waitResponse === index_1.FlashbotsBundleResolution.AccountNonceTooHigh) {
process.exit(0);
}
else {
console.log({
bundleStats: await flashbotsProvider.getBundleStats(simulation.bundleHash, targetBlock),
userStats: await flashbotsProvider.getUserStats()
});
}
});
}
main();
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