I'm looking for a way to trigger AWS CodeBuild only once when multiple files are uploaded to an S3 bucket, rather than for each individual file. I'm working on a project that involves scanning these files with ClamAV. If a file is infected, it gets removed and moved to a quarantine bucket. The challenge is that when I upload several files at once (like 10), I want the scanning process to occur only after all files are fully uploaded, avoiding multiple triggers for each upload. From what I understand, S3 doesn't trigger CodeBuild directly, so I was thinking of setting up a Lambda function triggered by S3 events, which would then initiate the CodeBuild project once all files have been uploaded. I'm interested in any effective patterns or resources that could help me implement this batch upload detection more efficiently.
5 Answers
I've used a similar approach by requiring an index file alongside the actual files. This index could include the names of all the files in the batch or some metadata. Once that index is in place, you can proceed with the scanning process.
If you can control the upload process, consider uploading a manifest file first. This file would list all the files that need scanning. You can trigger the Lambda function once the manifest is uploaded to then handle the scanning for the listed files. It's a neat way to ensure everything’s accounted for!
That's a great idea! But you also need to consider how to determine when all the files are uploaded. Are you basing it on the time frame or a specific count of files? This is crucial for implementing your solution effectively.
Instead of CodeBuild, you might want to consider using GuardDuty, which natively supports virus scanning. Check out the AWS docs for how to implement malware protection for S3. If cost is a concern, SQS and Lambda might still be your best bet.
You could set up S3 to send events to an SQS queue with a Lambda function as a consumer. Adjust the batch size to around 10 (or whatever you prefer) and use a longer batch window. This way, the Lambda function will poll the queue and wait to gather at least 10 messages or until the time expires before invoking your processing logic.
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