Terraform resource inheritance - terraform

Question

Is there a way to declare an abstract resource to inherit from?
Example:
resource "digitalocean_droplet" "worker_abstract" {
abstract = true // ???
name = "swarm-worker-${count.index}"
tags = [
"${digitalocean_tag.swarm_worker.id}"
]
// other config stuff
provisioner "remote-exec" {
//...
}
}
And then use declared resource with overridden variables:
resource "worker_abstract" "worker_foo" {
count = 2
name = "swarm-worker-foo-${count.index}"
tags = [
"${digitalocean_tag.swarm_worker.id}",
"${digitalocean_tag.foo.id}"
]
}
resource "worker_abstract" "worker_bar" {
count = 5
name = "swarm-worker-bar-${count.index}"
tags = [
"${digitalocean_tag.swarm_worker.id}"
"${digitalocean_tag.bar.id}"
]
}

Answer 1

This might be a little more "verbose" of a solution than what you're proposing, but this sounds like a perfect use-case for modules in 0.12.
You could create a module, say in the file worker/main.tf
variable "instances" {
type = number
}
variable "name" {
type = string
}
variable "tags" {
type = list(string)
default = []
}
resource "digitalocean_droplet" "worker" {
count = var.instances
name = "swarm-worker-${var.name}-${count.index}"
tags = var.tags
// other config stuff
provisioner "remote-exec" {
//...
}
}
then you could consume your module almost exactly like your example (let's say from the directory above worker)
module "worker_foo" {
source = "./worker"
instances = 2
name = "foo"
tags = [
"${digitalocean_tag.swarm_worker.id}",
"${digitalocean_tag.foo.id}"
]
}
module "worker_bar" {
source = "./worker"
instances = 5
name = "bar"
tags = [
"${digitalocean_tag.swarm_worker.id}"
"${digitalocean_tag.bar.id}"
]
}