terraform-provider-aws: Lambda Provisioned Concurrency bug and caveat

What can be done to get some movement on this issue? It’s been open for over a year, has a PR (with tests) against it that hasn’t been merged.

In the mean time this is the workaround we’ve used to avoid this:

resource "aws_lambda_provisioned_concurrency_config" "lambda_concurrency" {
  function_name                     = aws_lambda_function.lambda.function_name # this is the important bit, use the lambda name instead of the alias
  provisioned_concurrent_executions = var.provisioned_concurrency
  qualifier                         = aws_lambda_alias.lambda_alias.name
}

The function_name in the alias definition should be the lambda function name and not the arn. Give it a try

function_name = aws_lambda_function.lambda.arn ==> function_name = aws_lambda_function.lambda.function_name

The function_name in the alias definition should be the lambda function name and not the arn. Give it a try

function_name = aws_lambda_function.lambda.arn ==> function_name = aws_lambda_function.lambda.function_name

Yeah, that’s exactly what I suggested in this comment: https://github.com/hashicorp/terraform-provider-aws/issues/11152#issuecomment-816152381

But the fact of the matter is both the AWS docs here: https://docs.aws.amazon.com/lambda/latest/dg/API_PutProvisionedConcurrencyConfig.html

And the terraform docs here: https://registry.terraform.io/providers/hashicorp/aws/latest/docs/resources/lambda_provisioned_concurrency_config

Both permit using an arn, so like angelarosario suggested, the docs should be updated or this PR merged.

Should we at least update the Example usage in the documentation in the mean time so that others won’t get this error?

I have some ideas about how I might go about fixing the first problem. I’ll see if I can submit a PR in the next few days. To add some additional flavor to the original bug report, the lambda put-provisioned-concurrency docs support the following values for the function name parameter:

• Function name, e.g., my-function
• Function ARN, e.g., arn:aws:lambda:us-west-2:123456789012:function:my-function
• Partial ARN, e.g., 123456789012:function:my-function

The resource is persisted into state via the following invocation:

d.SetId(fmt.Sprintf("%s:%s", functionName, qualifier))

The func that parses the id from the state file uses the following code:

func resourceAwsLambdaProvisionedConcurrencyConfigParseId(id string) (string, string, error) {
	parts := strings.SplitN(id, ":", 2)

	if len(parts) != 2 || parts[0] == "" || parts[1] == "" {
		return "", "", fmt.Errorf("unexpected format of ID (%s), expected FUNCTION_NAME:QUALIFIER", id)
	}

	return parts[0], parts[1], nil
}

For each of the valid function name values noted in the API documentation, the function name, qualifier arn that this method returns are as follows:

In the case of the two latter items in the table, the qualifier must match the pattern “(|[a-zA-Z0-9$_-]+)”, which the presence of the “:” character does not satisfy.