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Write

Bạn có thể thực hiện "giao dịch" tương tác với Hợp đồng thông minh khi bạn cần cập nhật một số trạng thái trong hợp đồng.

Import the web3 and @kaiachain/web3js-ext packages to add kaia features on web3

Define sender's address and private key

Set up the provider with the specified kairos testnet URL. A provider in web3 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 account using web3.eth.accounts.privateKeyToAccount

Define contract Abi and address to interact with

Create a contract instance using Web3.eth.Contract with defined contractAbi and address. You can read and write the contract through this instance

Get the number before update

Create a transaction object that increment the number

Sign the transaction with sender account

Send the transaction to network and wait for the receipt

Get the number after update

smartContractWrite.js


const { Web3 } = require("@kaiachain/web3js-ext");
const senderAddr = "0x24e8efd18d65bcb6b3ba15a4698c0b0d69d13ff7";
const senderPriv = "0x4a72b3d09c3d5e28e8652e0111f9c4ce252e8299aad95bb219a38eb0a3f4da49";
const provider = new Web3.providers.HttpProvider("https://public-en-kairos.node.kaia.io");
const web3 = new Web3(provider);
const senderAccount = web3.eth.accounts.privateKeyToAccount(senderPriv);
/* 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 contractAbi = JSON.parse('[{"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 contract = new web3.eth.Contract(contractAbi, contractAddr);
  console.log("number before", (await contract.methods.number().call()).toString());
  const data = contract.methods.increment().encodeABI();
  const tx = {
    from: senderAddr,
    to: contractAddr,
    data: data,
  };
  const signResult = await senderAccount.signTransaction(tx);
  console.log("signedTx", signResult.transactionHash);
  const receipt = await web3.eth.sendSignedTransaction(signResult.rawTransaction);
  console.log("receipt", receipt);
  console.log("number after", (await contract.methods.number().call()).toString());
}
main();

output


❯ node smartContractWrite.js
number before 294
signedTx 0x842b7043b185e1e9506529f4562f27e70d6a4f1bd8fd0971e844f70a2d103eb6
receipt {
  blockHash: '0xa6e2b651bfd1f04ca7711f43eb650363a33fbd626314164bceb9e71ac6c709fa',
  blockNumber: 148743520n,
  cumulativeGasUsed: 28014n,
  effectiveGasPrice: 25000000000n,
  from: '0x24e8efd18d65bcb6b3ba15a4698c0b0d69d13ff7',
  gasUsed: 28014n,
  logs: [
    {
      address: '0x95be48607498109030592c08adc9577c7c2dd505',
      topics: [Array],
      data: '0x0000000000000000000000000000000000000000000000000000000000000127',
      blockNumber: 148743520n,
      transactionHash: '0x842b7043b185e1e9506529f4562f27e70d6a4f1bd8fd0971e844f70a2d103eb6',
      transactionIndex: 0n,
      blockHash: '0xa6e2b651bfd1f04ca7711f43eb650363a33fbd626314164bceb9e71ac6c709fa',
      logIndex: 0n,
      removed: false
    }
  ],
  logsBloom: '0x00000000000040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000000000000001200000002',
  status: 1n,
  to: '0x95be48607498109030592c08adc9577c7c2dd505',
  transactionHash: '0x842b7043b185e1e9506529f4562f27e70d6a4f1bd8fd0971e844f70a2d103eb6',
  transactionIndex: 0n,
  type: 2n
}
number after 295