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Learn how to efficiently copy files from one S3 bucket to another based on specific suffixes using Python and AWS Lambda.
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How to Easily Copy Files Between S3 Buckets Based on File Suffix

Managing files across multiple Amazon S3 buckets can be a daunting task, especially when you need to sort and copy files based on their extensions. In this post, we explore a simple yet effective solution to copy CSV and JSON files from a common bucket to designated folders based on their suffixes.

The Scenario

Imagine you have three S3 buckets:

commonfolder: This bucket contains both CSV and JSON files.

jsonfolder: This is where you want all the JSON files to go.

csvfolder: This is where you want all the CSV files to go.

You need a way to copy every JSON file from the commonfolder to the jsonfolder and every CSV file to the csvfolder. Fortunately, using Python and AWS's boto3 library in an AWS Lambda function, this task becomes straightforward.

The Solution

We will create a function that iterates over all objects in the commonfolder, checks the file suffix for each object, and copies them to their respective buckets accordingly.

Step 1: Setting Up Boto3

Before we dive into the code, ensure you have the boto3 library available in your environment. You can set it up by running:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Writing the Lambda Function

Here’s how you can write the Lambda function to perform the file copying.

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Testing the Function

After deploying the function, you can log the output to verify that the files are copying correctly. Here is an illustrative output you might see:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

With just a few lines of Python code, you can efficiently manage your S3 buckets, ensuring the right files end up in the right folders based on their extensions. This approach not only saves time but also reduces the potential for human error when moving files manually.

With AWS and Python, automating tasks like this becomes quick and streamlined, letting you focus on other important aspects of your project.



By following the solution provided, you now have a clear understanding of how to copy files from one S3 bucket to another based on the file suffix. Whether you're dealing with CSV or JSON files, the method described above will help you manage your data more effectively.