본문으로 건너뛰기
이 페이지는 영어로 된 기계 번역을 사용하므로 오류나 불명확한 언어가 포함될 수 있습니다. 가장 정확한 정보는 영어 원문을 참조하시기 바랍니다. 잦은 업데이트로 인해 일부 콘텐츠는 원래 영어로 되어 있을 수 있습니다. Crowdin에서 이 페이지의 번역을 개선하는 데 동참하여 도움을 주세요. (Crowdin translation page, Contributing guide)

Write

You can make a "transaction" interacting with a Smart Contract when you **need to update some state ** in the contract.

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

Define sender address and private key

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 wallet from sender private key and web3 provider

Set the Abi generated from solidity code

Define contract address to interact with

Create a contract instance with ethers.Contract, fill in params contractAddr, abi, provider. You can read and write the contract through this instance

Get the number value before updated by using method counter.number()

Create a transaction data to update the number value

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

Get the updated value number by using method counter.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

페이지를 개선해 주세요