How to Retrieve Transaction History and Logs for a Deployed Smart Contract on Local Devnet Using Hardhat?

[doukhahmed]

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Issue Description

I have successfully deployed a smart contract on a local devnet using Hardhat Ignition. Now, I want to retrieve the logs or transaction history related to this contract. Could someone guide me on the best practices or methods to check the transaction history and logs of a smart contract on a local devnet.

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[joohhnnn]

if you are using hardhat(I don't know how you did that cause the deploy script is all under foundry modules), you can use web3.js/ ethers.js to subscribe the log and set the filter rules to get the data you want.

[Chomtana]

You need to use getLogs

For ethers

import { ethers } from 'ethers';

// Connect to an local devnet RPC
const provider = new ethers.JsonRpcProvider('http://127.0.0.1:8545');

// The contract address you want to query logs from
const contractAddress = '0xYourContractAddress';

// The event/topic hash (use a specific event signature)
const eventSignature = ethers.id('Transfer(address,address,uint256)');

// Define the filter object
const filter = {
  address: contractAddress,   // Address of the contract
  topics: [eventSignature],   // Event signature or topic hash
  fromBlock: 1,        // Block number to start from (optional)
  toBlock: 'latest',          // Block number to end at (optional)
};

// Fetch logs from the provider
async function fetchLogs() {
  try {
    const logs = await provider.getLogs(filter);
    console.log('Logs:', logs);
  } catch (error) {
    console.error('Error fetching logs:', error);
  }
}

fetchLogs();

Viem

import { createPublicClient, http, parseAbiItem } from 'viem';
import { hardhat } from 'viem/chains';

// Create a client to connect to the local devnet network
const client = createPublicClient({
  chain: hardhat,
  transport: http('http://127.0.0.1:8545'),
});

// Define the contract address you want to query logs from
const contractAddress = '0xYourContractAddress';

// Define the ABI of the event you want to query (Transfer event as an example)
const transferEventAbi = parseAbiItem('event Transfer(address indexed from, address indexed to, uint256 value)');

// Set up the filter for fetching logs
const filter = {
  address: contractAddress,       // The contract address
  event: transferEventAbi,        // The ABI of the event to query
  fromBlock: 1n,           // Block number to start from (in BigInt format)
  toBlock: 'latest',              // Block number to end at
};

// Fetch logs using the filter
async function fetchLogs() {
  try {
    const logs = await client.getLogs({ ...filter });
    console.log('Logs:', logs);
  } catch (error) {
    console.error('Error fetching logs:', error);
  }
}

fetchLogs();

You can run this code outside of Hardhat. However, if you are using Hardhat, you can place the script inside the scripts folder and execute it with npx hardhat run scripts/... --network ... to deploy it on a specific network. In this case, you will need to update the provider from a hardcoded RPC to the Hardhat configuration style.

If you want to use hardhat ignition with these scripts, refer to this document: https://hardhat.org/ignition/docs/guides/scripts