Terraform enable or disable a resource conditionally - apache-kafka

Question

My requirement is to create or delete a resource by specifying enable flag true or false (In case of false the resource should get deleted, in case of true the resource should get created)
Kindly refer below code - here I am creating "confluent topic" resource and calling it dynamically using for_each condition.
Confluent Topic creation
topic.tf file:
resource "confluent_kafka_topic" "topic" {
kafka_cluster {
id = confluent_kafka_cluster.dedicated.id
}
for_each = { for t in var.topic_name : t.topic_name => t }
topic_name = each.value["topic_name"]
partitions_count = each.value["partitions_count"]
rest_endpoint = confluent_kafka_cluster.dedicated.rest_endpoint
credentials {
key = confluent_api_key.app-manager-kafka-api-key.id
secret = confluent_api_key.app-manager-kafka-api-key.secret
}
}
Variable declared as:
variable "topic_name" {
type = list(map(string))
default = [{
"topic_name" = "default_topic"
}]
}
And finally executing it through DEV.tfvars file:
topic_name = [
{
topic_name = "avro-topic-1"
partitions_count = "6"
},
{
topic_name = "json-topic-1"
partitions_count = "8"
},
]
The above code execution works fine and I am able to create and delete multiple resources. I want to modify it further and add a flag/toggle to create or delete a resource.
Example as shown below:
topic_name = [
{
topic_name = "avro-topic-1"
partitions_count = "6"
**enable = true #this flag will create the resource**
},
{
topic_name = "json-topic-1"
partitions_count = "8"
**enable = false #this flag will delete the resource**
},
]
Kindly help suggest how it can be achieved and if there is any different approach to follow.

Answer 1

As mentioned in my comment, I think this can be achieved with the following change:
resource "confluent_kafka_topic" "topic" {
for_each = { for t in var.topic_name : t.topic_name => t if t.enable }
kafka_cluster {
id = confluent_kafka_cluster.dedicated.id
}
topic_name = each.value["topic_name"]
partitions_count = each.value["partitions_count"]
rest_endpoint = confluent_kafka_cluster.dedicated.rest_endpoint
credentials {
key = confluent_api_key.app-manager-kafka-api-key.id
secret = confluent_api_key.app-manager-kafka-api-key.secret
}
}
Additionally, for_each should probably be at the top of the resource block to make sure it is visible immediately to the reader. The if t.enable part will make sure that for_each will create a resource only when the variable key has the enabled = true.