Trigger multiple lambda on single S3 object upload event

Question

I have setup a S3 event on my bucket that triggers a lambda to resize images. So every time a file is placed in bucket S3, the lambda function is called, an event with information from the created file will be sent to the lambda function.

Here is an example sample of how to trigger:

exports.handler = (event, context, callback) => {

  var lastCreatedFile = event.Records[0].s3.object.key;
  console.log(lastCreatedFile);

};

But my requirements is to trigger 2 lambda on one S3 event (upload object)- one image resize and another to store images meta data back to RDS.

But currently the S3 event doesn't support multiple lambda trigger. I saw an implementation that uses SNS and then send to multiple lambdas but I don't want to use that coz in that case I need to change my current architecture.

So let me know or show some other implementations or suggestions.

fedonev · Accepted Answer · 2021-12-14 21:51:08Z

7

The recently announced Amazon S3 Event Notifications with Amazon EventBridge lets you use trigger multiple lambdas off bucket events and has goodies like replay and archiving.

Or, you could stick with S3 Notifications and chain the lambda calls: S3 -> lambda1 -> lambda2. Yuck. Or use a Step Function S3 -> lambda -> Sfn -> lambda1 + lambda2. Double yuck. [Edit]: Triple Yuck - S3 -> Lambda1 -> S3 -> Lambda2

edited Dec 14, 2021 at 21:51

answered Dec 14, 2021 at 19:21

fedonev

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1 Comment

Caldazar Over a year ago

In addition to that, there's also an option of sending event notification to the SNS topic and subscribe Lambda functions to that topic. Problem with this approach is that the event is not the same as when it gets directly from S3 event (it has additional layer of SNS message around it)

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