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Account Update

費用委託

從 Web3j 和 kaia 庫（web3j-ext）中導入必要的類。

使用 Web3j 連接到 kaia 區塊鏈並指定 URL

使用私鑰創建發送方和付費方證書。

確定交易的gas價格和gas限額

從 credentials.getAddress() 獲取發件人地址

從 Kaia 網絡獲取鏈 ID

獲取發件人地址的 nonce

為賬戶更新生成新賬戶密鑰

為賬戶更新創建原始交易

使用 "KlayTransactionEncoder.signMessage "以**發送方的身份簽署交易。

使用 "KlayTransactionEncoder.signMessageAsFeePayer "將交易簽署為付費方。

向 kaia 網絡發送已簽署的交易

獲取交易收據

關閉 Web3j 實例

解碼原始交易以獲取交易類型

FeeDelegatedAccountUpdateExample.java

package org.web3j.example.transactions;

import org.web3j.tx.response.PollingTransactionReceiptProcessor;

import org.web3j.tx.response.TransactionReceiptProcessor;

import org.web3j.example.keySample;

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.account.AccountKeyPublic;

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

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

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

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 FeeDelegatedAccountUpdateExample implements keySample {

public static void run(KlayCredentials credentials) throws Exception {

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

KlayCredentials new_credentials = KlayCredentials.create(PUBLIC_KEY_privkey, PUBLIC_KEY_address);

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();

BigInteger newPubkey = new_credentials.getEcKeyPair().getPublicKey();

AccountKeyPublic accountkey = AccountKeyPublic.create(newPubkey);

TxType.Type type = Type.FEE_DELEGATED_ACCOUNT_UPDATE;

KlayRawTransaction raw = KlayRawTransaction.createTransaction(

type,

nonce,

GAS_PRICE,

GAS_LIMIT,

from,

accountkey);

// 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();

TxTypeFeeDelegatedAccountUpdate rawTransaction = TxTypeFeeDelegatedAccountUpdate

.decodeFromRawTransaction(signedMessage);

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

}

}

output

❯ java FeeDelegatedAccountUpdateExample.java

TxHash :

0xdc81bb3ae59a0fdbb9a6616aeaf1b05f7252681edcf71b121ebc0d43d7dde024

receipt :

class TransactionReceipt {

blockHash: 0x350799aaabe33fa8e1ee69a680aca014deb7b2d75562a3181342aafd5a477905

blockNumber: 0x8def123

codeFormat: null

contractAddress: null

feePayer: 0xcb0eb737dfda52756495a5e08a9b37aab3b271da

feePayerSignatures: [class TransactionReceiptFeePayerSignaturesInner {

V: 0x7f5

R: 0x2d805d33598b288d17fea47d2610a0ae16d9ad8cdd21d348366c51b8b3fa4d4f

S: 0x99ac39df17853a3d267040c2701616be38bc3c19d328c12bb74cf2f53268646

}]

feeRatio: null

from: 0xa2a8854b1802d8cd5de631e690817c253d6a9153

gas: 0x66919e

effectiveGasPrice: 0x5d21dba00

gasPrice: 0xba43b7400

gasUsed: 0xc738

humanReadable: null

key: 0x02a103dc9dccbd788c00fa98f7f4082f2f714e799bc0c29d63f04d48b54fe6250453cd

input: null

logs: []

logsBloom: 0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

nonce: 0x3c7

senderTxHash: 0xae469dc5bd4ae1eddcabebc9a15d523025aaeab4c95fbdf94e744f9965222bb0

signature: []

status: 0x1

txError: null

to: null

transactionHash: 0xdc81bb3ae59a0fdbb9a6616aeaf1b05f7252681edcf71b121ebc0d43d7dde024

transactionIndex: 0x3

type: TxTypeFeeDelegatedAccountUpdate

typeInt: 33

value: null

}

TxType : FEE_DELEGATED_ACCOUNT_UPDATE