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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创建合约实例，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");

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);

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

}