Скачать или смотреть Resolving Issues with async Functions in AWS Lambda Using Redis

Learn how to fix the issue where your AWS Lambda function isn't running an `async` function properly due to promise handling when using Redis.
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Troubleshooting AWS Lambda: Handling Async Functions with Redis

If you're working with AWS Lambda, you might encounter issues when dealing with asynchronous functions, especially when using packages like Redis. A common scenario involves an async function that fails to execute correctly, leading to frustrating behavior in your code.

In this guide, we're going to dive into a specific problem: how to ensure that your Lambda function runs properly when trying to use await with Redis operations. We'll provide a clear solution to help you troubleshoot and resolve these issues effectively.

The Problem: Lambda Function Not Running Async Effectively

Imagine you have a Lambda function set up to load data into Redis. You might expect that using await in front of your asynchronous function would allow it to execute properly. However, it's common to run into a situation where your Lambda function logs success but does not return the expected results.

Here's a snippet of code illustrating the problem:

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In the above code, the function loadRedis is declared as async, but it doesn't return a promise. Therefore, when using await loadRedis(message), there’s nothing being awaited because nothing is being returned.

The Solution: Properly Return a Promise

To ensure your async function works correctly in AWS Lambda, you need to return a promise from your asynchronous function. Here's the revised implementation:

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Key Changes Made:

Return a Promise: The main change is wrapping the Redis call in a Promise. This allows you to use resolve and reject to handle the asynchronous nature of your call correctly.

Handle Results and Errors: The revised code gracefully handles both errors and successful responses within the promise.

Conclusion

By restructuring your async function to return a promise, you can ensure that your AWS Lambda function executes correctly with Redis. This adjustment allows the await keyword to function as expected, leading to cleaner and more reliable code.

If you continue to experience issues, consider checking any other asynchronous operations within your Lambda function, ensuring that they are managed and awaited appropriately.

With these adjustments, you can confidently handle async operations in AWS Lambda using Redis, leading to more robust and effective serverless applications.