feat(runners): make the scale-up SQS event source mapping optional

main.tf

@@ -224,6 +224,7 @@ module "runners" {
   lambda_runtime                                                 = var.lambda_runtime
   lambda_architecture                                            = var.lambda_architecture
   lambda_event_source_mapping_batch_size                         = var.lambda_event_source_mapping_batch_size
+  enable_scale_up_event_source_mapping                           = var.enable_scale_up_event_source_mapping
   lambda_event_source_mapping_maximum_batching_window_in_seconds = var.lambda_event_source_mapping_maximum_batching_window_in_seconds
   lambda_zip                                                     = var.runners_lambda_zip
   lambda_scale_up_memory_size                                    = var.runners_scale_up_lambda_memory_size

modules/runners/scale-up.tf

@@ -98,6 +98,7 @@ resource "aws_lambda_event_source_mapping" "scale_up" {
   function_response_types            = ["ReportBatchItemFailures"]
   batch_size                         = var.lambda_event_source_mapping_batch_size
   maximum_batching_window_in_seconds = var.lambda_event_source_mapping_maximum_batching_window_in_seconds
+  enabled                            = var.enable_scale_up_event_source_mapping
   tags                               = var.tags
 }
 

modules/runners/variables.tf

@@ -855,6 +855,12 @@ variable "lambda_event_source_mapping_batch_size" {
   }
 }
 
+variable "enable_scale_up_event_source_mapping" {
+  description = "Enable the SQS event source mapping that invokes the scale-up lambda. Disable to drive scale-up from an external consumer of the build queue, for example a rate limiter that paces CreateFleet calls. When disabled, nothing consumes the build queue unless you provide your own consumer."
+  type        = bool
+  default     = true
+}
+
 variable "lambda_event_source_mapping_maximum_batching_window_in_seconds" {
   description = "Maximum amount of time to gather records before invoking the lambda function, in seconds. AWS requires this to be greater than 0 if batch_size is greater than 10. Defaults to 0."
   type        = number

variables.tf

@@ -1152,6 +1152,12 @@ variable "lambda_event_source_mapping_batch_size" {
   default     = 10
 }
 
+variable "enable_scale_up_event_source_mapping" {
+  description = "Enable the SQS event source mapping that invokes the scale-up lambda. Disable to drive scale-up from an external consumer of the build queue, for example a rate limiter that paces CreateFleet calls. When disabled, nothing consumes the build queue unless you provide your own consumer."
+  type        = bool
+  default     = true
+}
+
 variable "lambda_event_source_mapping_maximum_batching_window_in_seconds" {
   description = "Maximum amount of time to gather records before invoking the lambda function, in seconds. AWS requires this to be greater than 0 if batch_size is greater than 10. Defaults to 0."
   type        = number