Problem

using AWS’s open api integration is hard, esspially since you need to add your lambda arn’s to your swagger doc. No real good examples are shown of how to do this efficantly in Terraform

Outcome

using Terraform’s templating system, and a local array, I created a nice format for pushing all of your arns into swagger into a nice and easy to read format

resource "aws_lambda_function" "health" {
  //...
}

locals {
  lambdas = [
    aws_lambda_function.health
  ]

}

resource "aws_api_gateway_rest_api" "example_api" {
  //...
  body = templatefile("./api.yaml",
    { for lambda in local.lambdas : lambda.handler 
        => lambda.invoke_arn }
  )
}

and then in the swagger doc

openapi: 3.0.3
#...
paths:
  "/health/{name}":
    get:
      x-amazon-apigateway-integration:
        # and when deployed your lambda automatically is setup
        uri: "${health}"
        httpMethod: "POST"
        passthroughBehavior: "when_no_match"
        type: "aws_proxy"
#...

Conclusion

at the time this code was great, but I was looking for a backend solution a solo dev could fully maintain, and several hundreds of lines of swagger didnt match the team size at SaySo, So I eneded up pivioting to WebGRPC, but thought this trick was really cool and someday maybe we can spread syntax (this issue)