Added custom support for task definition

main.tf

@@ -29,14 +29,9 @@ resource "aws_cloudwatch_event_target" "default" {
   # Contains the Amazon ECS task definition and task count to be used, if the event target is an Amazon ECS task.
   # https://docs.aws.amazon.com/AmazonCloudWatchEvents/latest/APIReference/API_EcsParameters.html
   ecs_target {
-    launch_type         = "FARGATE"
+    launch_type         = var.launch_type
     task_count          = var.task_count
-    task_definition_arn = aws_ecs_task_definition.default[0].arn
-
-    # Specifies the platform version for the task. Specify only the numeric portion of the platform version, such as 1.1.0.
-    # This structure is used only if LaunchType is FARGATE.
-    # https://docs.aws.amazon.com/AmazonECS/latest/developerguide/platform_versions.html
-    platform_version = var.platform_version
+    task_definition_arn = var.create_ecs_task_definition ? aws_ecs_task_definition.default[0].arn : var.ecs_task_definition_arn
 
     # This structure specifies the VPC subnets and security groups for the task, and whether a public IP address is to be used.
     # This structure is relevant only for ECS tasks that use the awsvpc network mode.
@@ -115,7 +110,7 @@ locals {
 
 # https://www.terraform.io/docs/providers/aws/r/ecs_task_definition.html
 resource "aws_ecs_task_definition" "default" {
-  count = var.enabled ? 1 : 0
+  count = var.enabled && var.create_ecs_task_definition ? 1 : 0
 
   # A unique name for your task definition.
   family = var.name

variables.tf

@@ -21,6 +21,7 @@ variable "subnets" {
 variable "container_definitions" {
   type        = string
   description = "A list of valid container definitions provided as a single valid JSON document."
+  default     = null
 }
 
 variable "is_enabled" {
@@ -65,6 +66,12 @@ variable "memory" {
   description = "The amount (in MiB) of memory used by the task."
 }
 
+variable "launch_type" {
+  default     = "FARGATE"
+  type        = string
+  description = "Launch type to use for ecs task"
+}
+
 variable "requires_compatibilities" {
   default     = ["FARGATE"]
   type        = list(string)
@@ -118,3 +125,15 @@ variable "ecs_task_execution_role_arn" {
   type        = string
   description = "The ARN of the ECS Task Execution IAM Role."
 }
+
+variable "create_ecs_task_definition" {
+  default     = true
+  type        = string
+  description = "Specify true to indicate that Task Definition creation."
+}
+
+variable "ecs_task_definition_arn" {
+  default     = ""
+  type        = string
+  description = "Specify true to indicate that Task Definition creation."
+}