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RpcMevSendBundle.java

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package bundle;

import java.io.IOException;

import java.math.BigInteger;

import java.nio.file.Paths;

import java.util.List;

import java.util.concurrent.CompletableFuture;

import java.util.concurrent.ExecutionException;

import io.github.cdimascio.dotenv.Dotenv;

import io.reactivex.disposables.Disposable;

import net.flashbots.MevShareClient;

import net.flashbots.models.bundle.BundleItemType;

import net.flashbots.models.bundle.BundleParams;

import net.flashbots.models.bundle.Inclusion;

import net.flashbots.models.bundle.SendBundleResponse;

import net.flashbots.models.common.Network;

import net.flashbots.models.event.MevShareEvent;

import org.web3j.crypto.Credentials;

import org.web3j.crypto.RawTransaction;

import org.web3j.crypto.TransactionEncoder;

import org.web3j.protocol.Web3j;

import org.web3j.protocol.core.DefaultBlockParameterName;

import org.web3j.protocol.http.HttpService;

import org.web3j.tx.gas.DefaultGasProvider;

import org.web3j.utils.Convert;

import org.web3j.utils.Numeric;

/**

* Rpc mev_sendBundle method example

*

* @author kaichen

* @since 0.1.0

*/

public class RpcMevSendBundle {

public static void main(String[] args) throws ExecutionException, InterruptedException, IOException {

Dotenv dotenv = Dotenv.configure()

.directory(Paths.get("", "example").toAbsolutePath().toString())

.filename(".env")

.load();

Credentials authSigner = Credentials.create(dotenv.get("AUTH_PRIVATE_KEY"));

Web3j web3j = Web3j.build(new HttpService(dotenv.get("PROVIDER_URL")));

var mevShareClient = new MevShareClient(Network.GOERLI, authSigner, web3j);

CompletableFuture<MevShareEvent> future = new CompletableFuture<>();

Disposable eventSource = mevShareClient.subscribe(mevShareEvent -> {

if (mevShareEvent.getHash() != null) {

future.complete(mevShareEvent);

}

});

MevShareEvent mevShareEvent = future.get();

eventSource.dispose();

BigInteger number = web3j.ethGetBlockByNumber(DefaultBlockParameterName.LATEST, false)

.send()

.getBlock()

.getNumber();

Inclusion inclusion =

new Inclusion().setBlock(number.add(BigInteger.ONE)).setMaxBlock(number.add(BigInteger.valueOf(4)));

BundleItemType.HashItem bundleItem = new BundleItemType.HashItem().setHash(mevShareEvent.getHash());

Credentials signer = Credentials.create(dotenv.get("SENDER_PRIVATE_KEY"));

BigInteger nonce = web3j.ethGetTransactionCount(signer.getAddress(), DefaultBlockParameterName.PENDING)

.send()

.getTransactionCount();

BigInteger gasPrice = web3j.ethGasPrice().send().getGasPrice();

BigInteger gasLimit = DefaultGasProvider.GAS_LIMIT;

final String to = "0x56EdF679B0C80D528E17c5Ffe514dc9a1b254b9c";

final String amount = "0.001";

RawTransaction rawTransaction = RawTransaction.createEtherTransaction(

nonce,

gasPrice,

gasLimit,

to,

Convert.toWei(amount, Convert.Unit.ETHER).toBigInteger());

byte[] signedMessage = TransactionEncoder.signMessage(rawTransaction, signer);

String hexValue = Numeric.toHexString(signedMessage);

BundleItemType.TxItem txItem =

new BundleItemType.TxItem().setTx(hexValue).setCanRevert(true);

// body must include a tx

BundleParams bundleParams = new BundleParams().setInclusion(inclusion).setBody(List.of(bundleItem, txItem));

CompletableFuture<SendBundleResponse> res = mevShareClient.sendBundle(bundleParams);

System.out.println(res.get().getBundleHash());

mevShareClient.close();

}

}