Adding support for custom lambda scripts

[arobie1992]

I'm working on some aws lambdas that we want to forward logging to splunk for. The only thing is we need to customize the transform lambda function script some. I've cloned the repo and made changes that should allow this, but I don't seem to be able to push the changes. Would you be able to give me permission to create a branch and push?

[mlcooper]

What do you need to change in the transform lambda function contained in this repo? If you log your Lambda function to a Cloudwatch log group, then this existing terraform module should be able to be used as-is.

You would push your changes to a branch you create in your own repo and then open a PR with that being the source and the destination being the master branch in this repo.

[arobie1992]

I'd like to set source using the log group of the incoming event and switch to sending logs in json format among a couple other possibilities. Most of it is covered by the new lambda discussed here so I figured easies approach would be to allow swapping out of the lambda source file.

As far as the approach, makes sense. I'll fork the repo and make my changes there.

[loganm27]

In addition to setting the source & sourcetype fields, I also have a use case to add custom (static) fields to the outgoing events. Similar to the format here:

These additional fields help with end user filtering.

If the current lambda could support this, that would be great, but the ability to supply a custom lambda script would also work.