feat: terraform deployment alternative

[nitrocode]

It would be nice to have an alternative to cloud formation so this can be easily deployed to aws using terraform.

[alexcasalboni]

Hey @nitrocode, thanks for sharing!

I've been monitoring this issue, which would allow you to use SAR directly: hashicorp/terraform-provider-aws#3981

In the meantime, it looks like you can use aws_cloudformation_stack and deploy this resource (AWS::Serverless::Application).

I admit I haven't tried this as I don't have a lot of experience with Terraform myself. But it'd be great if we could document an official way to deploy Lambda Power Tuning with Terraform. Using the SAR app looks like a much easier mechanism that doesn't require to maintain two independent templates for SAM/CloudFormation and Terraform.

Do you think you could help me look into this?

[nitrocode]

I believe you are referring to something like in this comment.

buildkite/elastic-ci-stack-for-aws#246 (comment)

Not my preference but it should be easy enough. Waiting for the day when we can easily convert between the two.

[alexcasalboni]

@nitrocode, same here!

Check out this comment too, as referencing a SAR application via template_body looks much easier :)

hashicorp/terraform-provider-aws#3981 (comment)

[Clete2]

Terraform supports SAR CF stacks natively now.

Try something like this:

# Deploys a shared Lambda Power Tuning stack
# https://github.com/alexcasalboni/aws-lambda-power-tuning
resource "aws_serverlessapplicationrepository_cloudformation_stack" "lambda-power-tuning" {
  name           = "my-cool-lambda-power-tuner"
  application_id = "arn:aws:serverlessrepo:us-east-1:451282441545:applications/aws-lambda-power-tuning"
  capabilities   = ["CAPABILITY_IAM"]

  parameters = {
    PowerValues           = "128,192,256,512,1024,2048,3072,4096,5120,6144,7168,8192,9216,10240" # These are defaults, you can override when running the step function
    lambdaResource        = "*"
    totalExecutionTimeout = 900
    visualizationURL      = "https://lambda-power-tuning.show/"
  }
}

Terraform Documentation

(PS this is hot off the press: support was added about a week ago)

[alexcasalboni]

Thanks for sharing, @Clete2!

I'm going to document this asap :)

It still sounds a bit odd to deploy a CFN stack with Terraform, but I'm sure it will be useful to a lot of folks.

[Clete2]

@alexcasalboni I'm working on a PR to merge documentation for it.

It is indeed "weird" but it allows us to integrate the stacks with the rest of our Terraform code.

[Clete2]

See #120