The S3 event

In the previous chapter, we configured S3 to trigger a Lambda function when a new file is added to a bucket and its name matches certain rules. The same configuration can be applied here using the following configuration in our serverless.yml file:

    functions:
      processLog:
        handler: handler.processLog
        events:
          - s3:
              bucket: my-bucket-name
              event: s3:ObjectCreated:*
              rules:
                - prefix: logs/
                - suffix: .txt

The bucket name needs to be a new one. Due to limitations, you can't add events to an existing bucket.