Ethereum: Ethers.js: getLogs returning empty results despite existing transactions

Ethereum Ethers.js: Displaying Empty Results Despite Existing Transactions

When building decentralized applications, tracking transactions is crucial for auditing smart contracts and ensuring their integrity. A common issue when working with the Ethereum blockchain is getting empty results from getLogs despite existing transactions.

In this article, we will look at why you might experience this behavior and how you can prevent and resolve it using Ethers.js.

The Problem:

getLogs returns a log array containing information about transactions on the Ethereum network. However, if no new or updated transactions have been received for a given address within a certain period of time (also known as last block or block count), getLogs returns an empty array.

Why You Might See Empty Results

There are several reasons why you might see empty results from getLogs. Here are some possible reasons:

• No new transactions: If there are no new USDT transfers to specific wallet addresses within a certain period of time, “getLogs” will not return any logs.

• Old block number: If the last block number is older than the block number you are interested in (e.g. 100 blocks ago), “getLogs” may not return any results because there are no new transactions to retrieve from this block.

• Network congestion or slow transaction processing: On a high-traffic network, some transactions may be delayed or aborted, resulting in empty logs.

Troubleshooting Steps

To resolve this issue, try the following steps:

• Check existing transactions: Verify that there are indeed USDT transfers to specific wallet addresses by checking their balances and transaction history using other APIs or tools (e.g. MetaMask).

• Set a reasonable block limit

  

  : Increase the “blockNumber” parameter when calling “getLogs”. This will force Ethers.js to retrieve logs starting from the specified block number.

• Use paging

  : If there are a lot of transactions within a given time period, consider using paging to retrieve results in blocks. This can help process larger datasets more efficiently.

Sample Code

Here is an example code snippet that demonstrates the use of `getLogs'' with paging:

import * as ethers fromethers'';
const walletAddress = '0x...'; // Replace with the desired wallet address
const blockNumber = 100; // Set a reasonable limit for retrieving logs
async function getLogs() {
const provider = new ethers.providers.Web3Provider(window.ethereum);
try {
const logs = await provider.getLogs({
address: walletAddress,
blockNumber: blockNumber,
fromBlock: blockNumber,
toBlock: Infinity, // Retrieve all transactions in the current block
});
return logs;
} catch (error) {
console.error(error);
return [];
}
}
// Call getLogs with pagination
getLogs().then(logs => console.log(logs));

If you follow these steps and use pagination, you should be able to get empty results from `getLogs” despite existing transactions.

Ethereum Transactions Step Life