How to use api_gateway_base_path_mapping with terraform? - amazon-web-services

Question

I'm trying to setup a custom domain name for an api in api gateway on aws. I have setup the api fine using terraform. However when I try to setup the custom domain it fails with the following error.
Error applying plan:
1 error(s) occurred:
module.BillingMetrics.aws_api_gateway_base_path_mapping.billing: 1 error(s) occurred:
aws_api_gateway_base_path_mapping.billing: Error creating Gateway base path mapping: Error creating Gateway base path mapping: BadRequestException: Invalid REST API identifier specified
status code: 400, request id: b14bbd4c-5823-11e7-a4ea-93525a34b321
I can see in the terraform log that it does get the correct api_id. But I don't understand why it's saying the rest api identifier is invalid.
Below is an excerpt of my terraform file showing how I'm configuring the api_gateway_base_path_mapping.
resource "aws_api_gateway_resource" "views_resource" {
provider = "aws.regional"
rest_api_id = "${aws_api_gateway_rest_api.billing_api.id}"
parent_id = "${aws_api_gateway_rest_api.billing_api.root_resource_id}"
path_part = "views"
}
resource "aws_api_gateway_method" "views-get" {
provider = "aws.regional"
rest_api_id = "${aws_api_gateway_rest_api.billing_api.id}"
resource_id = "${aws_api_gateway_resource.views_resource.id}"
http_method = "GET"
authorization = "NONE"
}
resource "aws_api_gateway_method_response" "views_200" {
provider = "aws.regional"
rest_api_id = "${aws_api_gateway_rest_api.billing_api.id}"
resource_id = "${aws_api_gateway_resource.views_resource.id}"
http_method = "${aws_api_gateway_method.views-get.http_method}"
status_code = "200"
}
resource "aws_api_gateway_integration" "views-integration" {
provider = "aws.regional"
rest_api_id = "${aws_api_gateway_rest_api.billing_api.id}"
resource_id = "${aws_api_gateway_resource.views_resource.id}"
http_method = "${aws_api_gateway_method.views-get.http_method}"
type = "AWS"
uri = "arn:aws:apigateway:${var.region}:lambda:path/2015-03-31/functions/arn:aws:lambda:${var.region}:${var.account_id}:function:${aws_lambda_function.get_views.function_name}/invocations"
credentials = "${var.metrics_role_arn}"
http_method = "${aws_api_gateway_method.views-get.http_method}"
integration_http_method = "POST"
}
resource "aws_api_gateway_integration_response" "Views_Get_IntegrationResponse" {
provider = "aws.regional"
rest_api_id = "${aws_api_gateway_rest_api.billing_api.id}"
resource_id = "${aws_api_gateway_resource.views_resource.id}"
http_method = "${aws_api_gateway_method.views-get.http_method}"
status_code = "${aws_api_gateway_method_response.views_200.status_code}"
}
/* Deploy api */
resource "aws_api_gateway_deployment" "metric_deploy" {
provider = "aws.regional"
depends_on = ["aws_api_gateway_integration.metrics-integration", "aws_api_gateway_integration.hours-integration"]
stage_name = "beta"
rest_api_id = "${aws_api_gateway_rest_api.billing_api.id}"
}
resource "aws_api_gateway_domain_name" "billing" {
domain_name = "billing.example.com"
certificate_arn = "arn:aws:acm:us-east-1:6--:certificate/5--"
}
resource "aws_api_gateway_base_path_mapping" "billing" {
api_id = "${aws_api_gateway_rest_api.billing_api.id}"
stage_name = "${aws_api_gateway_deployment.metric_deploy.stage_name}"
domain_name = "${aws_api_gateway_domain_name.billing.domain_name}"
}
resource "aws_route53_record" "billing" {
zone_id = "Z-------"
name = "${aws_api_gateway_domain_name.billing.domain_name}"
type = "A"
alias {
name = "${aws_api_gateway_domain_name.billing.cloudfront_domain_name}"
zone_id = "${aws_api_gateway_domain_name.billing.cloudfront_zone_id}"
evaluate_target_health = true
}
}
Are there any more elements that needed to be configured to have the base_path_mapping apply correctly? Any other hints what I might be doing wrong?
I should also mention I'm on terraform 0.9.7.