Specify batch size as variable in sqs_integration module (#3)

modules/sqs_integration/main.tf

@@ -2,6 +2,7 @@ resource "aws_lambda_event_source_mapping" "receive_amount_of_developers" {
   function_name           = var.lambda.function_name
   event_source_arn        = var.queue_arn
   function_response_types = ["ReportBatchItemFailures"]
+  batch_size              = var.batch_size
 }
 
 data "aws_iam_policy_document" "this" {

modules/sqs_integration/variables.tf

@@ -15,3 +15,9 @@ variable "queue_arn" {
   description = "ARN of the SQS queue"
   type        = string
 }
+
+variable "batch_size" {
+  description = "The maximum number of events to retrieve in a single batch in the lambda"
+  type        = number
+  default     = null
+}