adding the functionality to attach a SQS as Dead Letter Queue to Lambda function (#23)

Author: Lexcenture

README.md

@@ -25,6 +25,7 @@ This module will deploy a Lambda function. It supports both Zip and Image deploy
 - `use_default_security_group` - (bool) - Use the default security group for the Lambda function.
 - `vpc_id` - (string) - The VPC ID in which the Lambda runs.
 - `tracing_mode` - (string) - Tracing mode for the Lambda. Valid options: PassThrough (default) and Active.
+- `dead_letter_queue_arn` - (string)- The ARN of the dead letter queue for the Lambda function.
 
 ### Zip deployment variables
 - `runtime` - (string) - **REQUIRED** - The runtime environment for the Lambda function you are uploading.

main.tf

@@ -77,6 +77,13 @@ resource "aws_lambda_function" "lambda_function" {
   tracing_config {
     mode = var.tracing_mode
   }
+
+  dynamic "dead_letter_config" {
+    for_each = var.dead_letter_queue_arn != "" ? [1] : []  
+    content {
+      target_arn = var.dead_letter_queue_arn
+    }
+  }
 }
 
 resource "aws_cloudwatch_log_group" "lambda_loggroup" {

variables.tf

@@ -16,6 +16,12 @@ variable "image_config_entry_point" {
   default     = []
 }
 
+variable "dead_letter_queue_arn" {
+  type        = string
+  description = "The ARN of the dead letter queue for the Lambda function."
+  default     = ""  
+}
+
 variable "image_config_working_directory" {
   type        = string
   description = "Optional override of image's WORKDIR"