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Write

当您需要更新合约中的某些状态时,可以与智能合约进行**"事务 "**交互。

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

定义发件人地址私人密钥

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

用发件人私钥Web3 提供商创建钱包

设置由 solidity 代码生成的 Abi

定义与之交互的合约地址

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

使用方法counter.number()获取更新前的数字

创建事务数据以更新编号

如果已在区块链中完成发送,wait函数将返回发送回执。

使用方法 counter.number() 获取更新值 number

smartContractWrite.js

const ethers = require("ethers");
const { Wallet } = require("@kaiachain/ethers-ext");
const senderAddr = "0x24e8efd18d65bcb6b3ba15a4698c0b0d69d13ff7";
const senderPriv = "0x4a72b3d09c3d5e28e8652e0111f9c4ce252e8299aad95bb219a38eb0a3f4da49";
const provider = new ethers.providers.JsonRpcProvider("https://public-en-kairos.node.kaia.io");
const wallet = new Wallet(senderPriv, provider);
/* compiled in remix.ethereum.org (compiler: 0.8.18, optimizer: false)
// SPDX-License-Identifier: UNLICENSED
pragma solidity ^0.8.13;
contract Counter {
uint256 public number;
event SetNumber(uint256 number);
constructor(uint256 initNumber) {
number = initNumber;
}
function setNumber(uint256 newNumber) public {
number = newNumber;
emit SetNumber(number);
}
function increment() public {
number++;
emit SetNumber(number);
}
}
*/
const abi = '[{"inputs":[{"internalType":"uint256","name":"initNumber","type":"uint256"}],"stateMutability":"nonpayable","type":"constructor"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"uint256","name":"number","type":"uint256"}],"name":"SetNumber","type":"event"},{"inputs":[],"name":"increment","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"number","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"uint256","name":"newNumber","type":"uint256"}],"name":"setNumber","outputs":[],"stateMutability":"nonpayable","type":"function"}]';
const contractAddr = "0x95Be48607498109030592C08aDC9577c7C2dD505";
async function main() {
const counter = new ethers.Contract(contractAddr, abi, wallet);
console.log("number before", (await counter.number()).toString());
const sentTx = await counter.increment();
const receipt = await sentTx.wait();
console.log("receipt", receipt);
console.log("number after", (await counter.number()).toString());
}
main();

output

❯ node smartContractWrite.js
number before 291
receipt {
to: '0x95Be48607498109030592C08aDC9577c7C2dD505',
from: '0x24e8eFD18D65bCb6b3Ba15a4698c0b0d69d13fF7',
contractAddress: null,
transactionIndex: 0,
gasUsed: BigNumber { _hex: '0x6d6e', _isBigNumber: true },
logsBloom: '0x00000000000040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000001200000002',
blockHash: '0xbc6486ec825cf2388917f6c5c250af3f811bc838ea3f83382c1786d31b1eaaac',
transactionHash: '0x07c87084001218f66e260cb63c207c676eae3bb4a338b7384457f6a4fdebd5da',
logs: [
{
transactionIndex: 0,
blockNumber: 148740640,
transactionHash: '0x07c87084001218f66e260cb63c207c676eae3bb4a338b7384457f6a4fdebd5da',
address: '0x95Be48607498109030592C08aDC9577c7C2dD505',
topics: [Array],
data: '0x0000000000000000000000000000000000000000000000000000000000000124',
logIndex: 0,
blockHash: '0xbc6486ec825cf2388917f6c5c250af3f811bc838ea3f83382c1786d31b1eaaac'
}
],
blockNumber: 148740640,
confirmations: 1,
cumulativeGasUsed: BigNumber { _hex: '0x6d6e', _isBigNumber: true },
effectiveGasPrice: BigNumber { _hex: '0x05d21dba00', _isBigNumber: true },
status: 1,
type: 2,
byzantium: true,
events: [
{
transactionIndex: 0,
blockNumber: 148740640,
transactionHash: '0x07c87084001218f66e260cb63c207c676eae3bb4a338b7384457f6a4fdebd5da',
address: '0x95Be48607498109030592C08aDC9577c7C2dD505',
topics: [Array],
data: '0x0000000000000000000000000000000000000000000000000000000000000124',
logIndex: 0,
blockHash: '0xbc6486ec825cf2388917f6c5c250af3f811bc838ea3f83382c1786d31b1eaaac',
args: [Array],
decode: [Function (anonymous)],
event: 'SetNumber',
eventSignature: 'SetNumber(uint256)',
removeListener: [Function (anonymous)],
getBlock: [Function (anonymous)],
getTransaction: [Function (anonymous)],
getTransactionReceipt: [Function (anonymous)]
}
]
}
number after 292

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