Cancel

TxTypeCancel cancels the execution of the transaction with the same nonce in the transaction pool. This transaction type is useful when a submitted transaction seems unprocessed for a certain amount of time.

Import necessary classes from the Web3j and kaia libraries(web3j-ext).

Create a Web3j instance with the specified BAOBAB_URL

Load credentials for sender and fee payer

Gas price and gas limit settings

Set the sender's from address using credentials.getAddress

Get the chain ID from the network

Getting the nonce for the sender's address

Set the transaction type to FEE_DELEGATED_CANCEL

Create a raw transaction for canceling pending transaction

Signing the transaction as sender using KlayTransactionEncoder.signMessage.

Signing the transaction as fee payer using KlayTransactionEncoder.signMessageAsFeePayer.

Sending the signed transaction to kaia network

Getting the transaction receipt

Shutdown the web3j instance

Decoding the raw transaction to get the transaction type

FeeDelegatedCancel.java

package org.web3j.example.transactions;

import java.io.IOException;

import java.math.BigInteger;

import org.web3j.crypto.KlayCredentials;

import org.web3j.crypto.KlayRawTransaction;

import org.web3j.crypto.KlayTransactionEncoder;

import org.web3j.crypto.transaction.type.TxType;

import org.web3j.crypto.transaction.type.TxTypeFeeDelegatedCancel;

import org.web3j.crypto.transaction.type.TxType.Type;

import org.web3j.tx.response.PollingTransactionReceiptProcessor;

import org.web3j.tx.response.TransactionReceiptProcessor;

import org.web3j.example.keySample;

import org.web3j.protocol.core.DefaultBlockParameterName;

import org.web3j.protocol.core.methods.response.EthChainId;

import org.web3j.protocol.core.methods.response.EthSendTransaction;

import org.web3j.protocol.http.HttpService;

import org.web3j.protocol.kaia.Web3j;

import org.web3j.utils.Numeric;

import org.web3j.protocol.kaia.core.method.response.TransactionReceipt;

/**

*

*/

public class FeeDelegatedCancelExample implements keySample {

/**

*

*/

public static void run() throws Exception {

Web3j web3j = Web3j.build(new HttpService(keySample.BAOBAB_URL));

KlayCredentials credentials = KlayCredentials.create(keySample.LEGACY_KEY_privkey);

KlayCredentials credentials_feepayer = KlayCredentials.create(keySample.LEGACY_KEY_FEEPAYER_privkey);

BigInteger GAS_PRICE = BigInteger.valueOf(50000000000L);

BigInteger GAS_LIMIT = BigInteger.valueOf(6721950);

String from = credentials.getAddress();

EthChainId EthchainId = web3j.ethChainId().send();

long chainId = EthchainId.getChainId().longValue();

BigInteger nonce = web3j.ethGetTransactionCount(from, DefaultBlockParameterName.LATEST).send()

.getTransactionCount();

TxType.Type type = Type.FEE_DELEGATED_CANCEL;

KlayRawTransaction raw = KlayRawTransaction.createTransaction(

type,

nonce,

GAS_PRICE,

GAS_LIMIT,

from);

// Sign as sender

byte[] signedMessage = KlayTransactionEncoder.signMessage(raw, chainId, credentials);

// Sign same message as Fee payer

signedMessage = KlayTransactionEncoder.signMessageAsFeePayer(raw, chainId, credentials_feepayer);

String hexValue = Numeric.toHexString(signedMessage);

EthSendTransaction transactionResponse = web3j.ethSendRawTransaction(hexValue).send();

System.out.println("TxHash : \n " + transactionResponse.getResult());

String txHash = transactionResponse.getResult();

int DEFAULT_POLLING_ATTEMPTS_PER_TX_HASH = 40;

int DEFAULT_BLOCK_TIME = 1 * 1000;

long DEFAULT_POLLING_FREQUENCY = DEFAULT_BLOCK_TIME;

TransactionReceiptProcessor transactionReceiptProcessor = new PollingTransactionReceiptProcessor(web3j,

DEFAULT_POLLING_FREQUENCY, DEFAULT_POLLING_ATTEMPTS_PER_TX_HASH);

org.web3j.protocol.core.methods.response.TransactionReceipt ethReceipt = transactionReceiptProcessor

.waitForTransactionReceipt(txHash);

System.out.println("Receipt from eth_getTransactionReceipt : \n" + ethReceipt);

TransactionReceipt receipt = web3j.klayGetTransactionReceipt(txHash).send().getResult();

System.out.println("Receipt from klay_getTransactionReceipt : \n" + receipt);

web3j.shutdown();

TxTypeFeeDelegatedCancel rawTransaction = TxTypeFeeDelegatedCancel.decodeFromRawTransaction(signedMessage);

System.out.println("TxType : " + rawTransaction.getKlayType());

}

}

output

❯ java FeeDelegatedCancel.java

TxHash :

0x2e9abcc9d23fc32e3a2afb55172e5925b9543b445f1a8fbdb8b7aa50d9bad812

receipt :

class TransactionReceipt {

blockHash: 0xa1985b9c6a7cd8d58ef511915a677e33c5d6029d95f9223fec3febed65500051

blockNumber: 0x8def165

codeFormat: null

contractAddress: null

feePayer: 0xcb0eb737dfda52756495a5e08a9b37aab3b271da

feePayerSignatures: [class TransactionReceiptFeePayerSignaturesInner {

V: 0x7f5

R: 0xed71b68bca8a44a6de168c51d312ea4815d742f779f2a7aaa66f9102a5d03d54

S: 0x16d7e9f7dc05d2a510cfb34a967ea6cb025b793973d116fce51ed83922a8812b

}]

feeRatio: null

from: 0xa2a8854b1802d8cd5de631e690817c253d6a9153

gas: 0x66919e

effectiveGasPrice: 0x5d21dba00

gasPrice: 0xba43b7400

gasUsed: 0x7918

humanReadable: null

key: null

input: null

logs: []

logsBloom: 0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

nonce: 0x3c8

senderTxHash: 0x8800b74af76967feb1229a827416896b1856be65d4178d58b57e247f6b4238c2

signature: []

status: 0x1

txError: null

to: null

transactionHash: 0x2e9abcc9d23fc32e3a2afb55172e5925b9543b445f1a8fbdb8b7aa50d9bad812

transactionIndex: 0x0

type: TxTypeFeeDelegatedCancel

typeInt: 57

value: null

}

TxType : FEE_DELEGATED_CANCEL