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Smart Contract Execution

TxTypeSmartContractExecution 使用给定数据执行智能合约。只有当 "to "是智能合约账户时，才接受TxTypeSmartContractExecution。

导入 ethers 和 @kaiachain/ethers-ext 模块，在 ethers.js 上添加 kaia 功能。

定义发送方和付费方地址和私人密钥

使用指定的 kairos 测试网 URL 设置提供程序。以太坊中的提供者是访问区块链数据的只读抽象。

此外，您还可以将提供商 URL 从 kairos 更改为 quicknode

使用发件人的私人密钥和提供商创建发件人钱包

使用发送者的私人密钥和提供者的私人密钥创建付费者钱包

在至字段中设置要执行的合约地址，并设置ABI

使用 ethers.Contract创建合同实例，填写参数 contractAddr、abi、provider。您可以通过该实例读写合约

使用 encodeFunctionData 函数对函数名和参数进行编码

以FeeDelegatedSmartContractExecution类型创建交易对象

在交易中输入必要的详细信息

通过发送人的钱包签署交易

使用付费者的钱包将交易发送到区块链上。函数 "sendTransactionAsFeePayer "会在发送者的签名上添加一个带有 FeePayer 私钥的签名，并将其传输到区块链网络。

如果 tx 已成功发送到区块链，wait 函数将返回 tx 收据。

FeeDelegatedSmartContractExecution.js

const ethers = require("ethers");

const { Wallet, TxType } = require("@kaiachain/ethers-ext/v6");

const senderAddr = "0xa2a8854b1802d8cd5de631e690817c253d6a9153";

const senderPriv = "0x0e4ca6d38096ad99324de0dde108587e5d7c600165ae4cd6c2462c597458c2b8";

const feePayerAddr = "0xcb0eb737dfda52756495a5e08a9b37aab3b271da";

const feePayerPriv = "0x9435261ed483b6efa3886d6ad9f64c12078a0e28d8d80715c773e16fc000cff4";

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

const senderWallet = new Wallet(senderPriv, provider);

const feePayerWallet = new Wallet(feePayerPriv, provider);

const contractAddr = "0x95Be48607498109030592C08aDC9577c7C2dD505";

const abi = ["function setNumber(uint256 newNumber)"];

async function main() {

const contract = new ethers.Contract(contractAddr, abi, provider);

const data = contract.interface.encodeFunctionData("setNumber", ["0x123"]);

const tx = {

type: TxType.FeeDelegatedSmartContractExecution,

from: senderAddr,

to: contractAddr,

value: 0,

data: data,

};

// 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 FeeDelegatedSmartContractExecution.js

senderTxHashRLP 0x31f8a68203ad850ba43b7400830116379495be48607498109030592c08adc9577c7c2dd5058094a2a8854b1802d8cd5de631e690817c253d6a9153a43fb5c1cb0000000000000000000000000000000000000000000000000000000000000123f847f8458207f6a0f23531b148298b6b686af71c9722702732bed89202dd2a22adf9880b716ed205a074c31ec53da203c1421ae71e36e3b720f9550a00771784562b68c1cfa23e19e8

sentTx 0x8ddf463d1e2d5745b9ba71abce52eb02b6680d9699298c463c72180a7dd2c539

receipt {

to: '0x95Be48607498109030592C08aDC9577c7C2dD505',

from: '0xA2a8854b1802D8Cd5De631E690817c253d6a9153',

contractAddress: null,

transactionIndex: 4,

gasUsed: BigNumber { _hex: '0x9659', _isBigNumber: true },

logsBloom: '0x00000000000040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000001200000002',

blockHash: '0xa466ec90d778b7ea3e2c2cd3ec2a707fcf31a8c5f44d29d1e85f4c690af8ddb4',

transactionHash: '0x8ddf463d1e2d5745b9ba71abce52eb02b6680d9699298c463c72180a7dd2c539',

logs: [

{

transactionIndex: 4,

blockNumber: 148732388,

transactionHash: '0x8ddf463d1e2d5745b9ba71abce52eb02b6680d9699298c463c72180a7dd2c539',

address: '0x95Be48607498109030592C08aDC9577c7C2dD505',

topics: [Array],

data: '0x0000000000000000000000000000000000000000000000000000000000000123',

logIndex: 14,

blockHash: '0xa466ec90d778b7ea3e2c2cd3ec2a707fcf31a8c5f44d29d1e85f4c690af8ddb4'

}

],

blockNumber: 148732388,

confirmations: 3,

cumulativeGasUsed: BigNumber { _hex: '0x0b61a0', _isBigNumber: true },

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

status: 1,

type: 0,

byzantium: true

}