example of how to configure a lambda with a s3 event

serverless.yml

service: my-pipeline

provider:
  name: aws
  region: eu-central-1
  runtime: python3.7

functions:
  extract:
    handler: lambda_function/extract.handler
    events:
      - s3:
          bucket: some-bucket
          event: s3:ObjectCreated:*
          rules:
            - prefix: raw/
            - suffix: .msg
    environment:
        DEST_BUCKET: some-bucket
        DEST_KEY: stg/extract/