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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 the ethers and @kaiachain/ethers-ext packages to add kaia features on ethers.js

Define sender, fee payer addresses and private keys

Set up the provider with the specified kairos testnet URL. A provider in ethers is a read-only abstraction to access the blockchain data.

Also, you can change the provider URL from kairos to quicknode

Create a sender's wallet with the private key and the provider

Create a fee payer's wallet with the private key and the provider

Declare a transaction with the from field as sender address and the type field as TxType.FeeDelegatedCancel

Sign the transaction with sender wallet and print out the senderTxHashRLP

Send the transaction to blockchain using fee payer's wallet. Function sendTransactionAsFeePayer adds a signature with FeePayer’s private key to the sender’s signature and transmits it to the blockchain network.

The wait function returns the tx receipt if it is completed in the blockchain.

TxFeeDelegatedCancelType.js

const ethers = require("ethers");

const { Wallet, TxType, parseKlay } = require("@kaiachain/ethers-ext/v5");

const senderAddr = "0xa2a8854b1802d8cd5de631e690817c253d6a9153";

const senderPriv = "0x0e4ca6d38096ad99324de0dde108587e5d7c600165ae4cd6c2462c597458c2b8";

const feePayerAddr = "0xcb0eb737dfda52756495a5e08a9b37aab3b271da";

const feePayerPriv = "0x9435261ed483b6efa3886d6ad9f64c12078a0e28d8d80715c773e16fc000cff4";

const provider = new ethers.providers.JsonRpcProvider("https://public-en-kairos.node.kaia.io");

const senderWallet = new Wallet(senderPriv, provider);

const feePayerWallet = new Wallet(feePayerPriv, provider);

async function main() {

const tx = {

type: TxType.FeeDelegatedCancel,

from: senderAddr,

};

// Sign transaction by sender

const populatedTx = await senderWallet.populateTransaction(tx);

const senderTxHashRLP = await senderWallet.signTransaction(populatedTx);

console.log("senderTxHashRLP", senderTxHashRLP);

// Sign and send transaction by fee payer

const sentTx = await feePayerWallet.sendTransactionAsFeePayer(senderTxHashRLP);

console.log("sentTx", sentTx.hash);

const receipt = await sentTx.wait();

console.log("receipt", receipt);

}

main();

output

❯ node TxFeeDelegatedCancelType.js

senderTxHashRLP 0x39f86a8203af850ba43b740082cd1494a2a8854b1802d8cd5de631e690817c253d6a9153f847f8458207f5a06c639b8828bb27b36b2575636b4ec9dd4c7de4820327fe158746d03b28b90d8ba0332b43ec974ecb3ea16593760cb6e139a95d4ce03847681fb053a00143eb91a1

sentTx 0xd81cd9190f2fd40f6b2e6472f91b95a1e09e2ad3dfc41a6b3458274eb5c9175c

receipt {

to: '0xA2a8854b1802D8Cd5De631E690817c253d6a9153',

from: '0xA2a8854b1802D8Cd5De631E690817c253d6a9153',

contractAddress: null,

transactionIndex: 1,

gasUsed: BigNumber { _hex: '0x7918', _isBigNumber: true },

logsBloom: '0x00000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',

blockHash: '0x02d655e716e1a5c8d497f66a6d80683c633d3e4002a9e26026f101983d951c1a',

transactionHash: '0xd81cd9190f2fd40f6b2e6472f91b95a1e09e2ad3dfc41a6b3458274eb5c9175c',

logs: [],

blockNumber: 148732476,

confirmations: 3,

cumulativeGasUsed: BigNumber { _hex: '0x034b1d', _isBigNumber: true },

effectiveGasPrice: BigNumber { _hex: '0x05d21dba00', _isBigNumber: true },

status: 1,

type: 0,

byzantium: true

}