Add validation on ecs task size variable

terraform/modules/services/nwp_consumer/variables.tf

@@ -86,6 +86,68 @@ variable ecs-task_type {
   default = "task"
 }
 
+variable ecs-task_size {
+
+  type = object({
+    cpu = number
+    memory = number
+  })
+
+  description = <<EOT
+    ecs-task_size = {
+      cpu : "CPU units for the ECS task"
+      memory : "Memory units (MB) for the ECS task"
+    }
+    ecs-task_size: "Size of the ECS task in terms of compute and memory"
+  EOT
+
+  default = {
+    cpu = 1024
+    memory = 5120
+  }
+
+  validation {
+    condition = length(keys(var.ecs-task_size)) == 2
+    error_message = "Variable ecs-task_size must have exactly two keys: cpu and memory."
+  }
+  // See https://docs.aws.amazon.com/AmazonECS/latest/developerguide/task_definition_parameters.html#data
+  // for valid CPU and memory values.
+  validation {
+    condition = contains(["256", "512", "1024", "2048", "4096", "8192"], var.ecs-task_size.cpu)
+    error_message = "CPU must be one of 256, 512, 1024, 2048, 4096, or 8192."
+  }
+  validation {
+    // If the CPU is 256, the memory must be 0.5, 1, or 2 * 1024 MiB. 
+    condition = var.ecs-task_size.cpu == "256" && contains(["512", "1024", "2048"], var.ecs-task_size.memory)
+    error_message = "For CPU 256, memory must be one of 512, 1024, or 2048."
+  }
+  validation {
+    // If the CPU is 512, the memory must be between 1 and 4 GiB, in 1 GiB increments.
+    condition = var.ecs-task_size.cpu == "512" && contains(range(1024, 4096, 1024), var.ecs-task_size.memory)
+    error_message = "Fo CPU 512, memory must be one of 1024, 2048, 3072, or 4096."
+  }
+  validation {
+    // If the CPU is 1024, the memory must be between 2 and 8 GiB, in 1 GiB increments.
+    condition = var.ecs-task_size.cpu == "1024" && contains(range(2048, 8192, 1024), var.ecs-task_size.memory)
+    error_message = "For CPU 1024, memory must be one of 2048 and 8192 in 1024 increments."
+  }
+  validation {
+    // If the CPU is 2048, the memory must be between 4 and 16 GiB, in 1 GiB increments.
+    condition = var.ecs-task_size.cpu == "2048" && contains(range(4096, 16384, 1024), var.ecs-task_size.memory)
+    error_message = "Memory must be between 4096 and 16384 in 1024 increments."
+  }
+  validation {
+    // If the CPU is 4096, the memory must be between 8 and 30 GiB, in 1 GiB increments.
+    condition = var.ecs-task_size.cpu == "4096" && contains(range(8192, 30720, 1024), var.ecs-task_size.memory)
+    error_message = "Memory must be between 8192 and 30720 in 1024 increments."
+  }
+  validation {
+    // If the CPU is 8192, the memory must be between 16 and 60 GiB, in 4 GiB increments.
+    condition = var.ecs-task_size.cpu == "8192" && contains(range(16384, 61440, 4096), var.ecs-task_size.memory)
+    error_message = "Memory must be between 16384 and 61440 in 4096 increments."
+  }
+}
+
 variable ecs-task_cpu {
   type = number
   description = "CPU units for the ECS task"
@@ -95,6 +157,6 @@ variable ecs-task_cpu {
 variable ecs-task_memory {
   type = number
   description = "Memory units (MB) for the ECS task"
-  default = 5012
+  default = 5120
 }