query-logs

query-logs

This example shows how to query logs for smart contracts, transactions, or blocks. It is comprised of a single example script that queries logs with the Transfer method event signature of a QRC20 token contract.

Dependencies

• Node.js - JavaScript runtime
• quais - Quai JavaScript SDK

Usage

To install dependencies, navigate to this directory (quais-by-example/query-logs) and run:

npm install

Use nodejs to run the example script:

node index.js

Example Breakdown

The index.js script takes in a filter object with instructions on block ranges and event signatures to query for. To run the script, you'll need to edit the filter variable.

const filter = {
	fromBlock: -10, // start query at block 10 from latest
	toBlock: 'latest', // end query at latest block
	topics: [quais.utils.id('Transfer(address,address,uint256)')], // Transfer event signature
}

Ensure that the rpcURL you provide is for the chain you want to query logs for. Once you've done that, you can run the script with:

node index.js

This script will output any log data that matches your filter params in JSON format.