Request for an example of Lambda pulling from SQS and provisioning all the involved resources.

[ezeql]

Hello,

Thanks for this useful component.

I would like to request an example of https://github.com/spring-media/terraform-aws-lambda/tree/master/examples/example-with-sqs-event involving the creation of the required SQS queue instead of hard-coding the ARN on it.

[moritzzimmer]

Hi @ezeql,

you can include the SQS resource directly in your module like this:

resource "aws_sqs_queue" "example" {
  name = "example"
}

module "issue-63" {
  source  = "spring-media/lambda/aws"
  version = "5.2.0"

  filename      = "${path.module}/../bin/issue-63.zip"
  function_name = "tf-issue-63"
  handler       = "issue-63"
  runtime       = "go1.x"

  event = {
    type             = "sqs"
    event_source_arn = aws_sqs_queue.example.arn
  }
}

This module relies heavily on count to determine which resources should be created. So if you just run

$ terraform apply -var region=us-west-2

which works when using a hard-coded ARN or a data source, you'll get those errors:

The "count" value depends on resource attributes that cannot be determined
until apply, so Terraform cannot predict how many instances will be created.
To work around this, use the -target argument to first apply only the
resources that the count depends on.

Like described in the error message, just add an intermediate terraform command:

$ terraform apply -var region=us-west-2 -target aws_sqs_queue.example 
$ terraform apply -var region=us-west-2

Let me know if this answers your question.

[ezeql]

Thank you @moritzzimmer