enha: added variable to define arm64 Lambda function (#7)

Author: kfc-manager

README.md

@@ -21,17 +21,18 @@ This module provides a Lambda function which logs to CloudWatch. If no image URI
 
 ## Inputs
 
-| Name          | Description                                                                  | Type           | Default | Required |
-| ------------- | ---------------------------------------------------------------------------- | -------------- | ------- | :------: |
-| identifier    | Unique identifier to differentiate global resources.                         | `string`       | n/a     |   yes    |
-| policies      | List of IAM policy ARNs for the Lambda's IAM role.                           | `list(string)` | []      |    no    |
-| vpc_config    | Object to define the subnets and security groups for the Lambda function.    | `object`       | null    |    no    |
-| log_config    | Object to define logging configuration of the Lambda function to CloudWatch. | `object`       | null    |    no    |
-| image         | Object of the image which will be pulled by the Lambda function to execute.  | `object`       | null    |    no    |
-| memory_size   | Amount of memory in MB the Lambda function can use at runtime.               | `number`       | 128     |    no    |
-| timeout       | Amount of time the Lambda function has to run in seconds.                    | `number`       | 3       |    no    |
-| env_variables | A map of environment variables for the Lambda function at runtime.           | `map(string)`  | {}      |    no    |
-| tags          | A map of tags to add to all resources.                                       | `map(string)`  | {}      |    no    |
+| Name          | Description                                                                                   | Type           | Default  | Required |
+| ------------- | --------------------------------------------------------------------------------------------- | -------------- | -------- | :------: |
+| identifier    | Unique identifier to differentiate global resources.                                          | `string`       | n/a      |   yes    |
+| policies      | List of IAM policy ARNs for the Lambda's IAM role.                                            | `list(string)` | []       |    no    |
+| vpc_config    | Object to define the subnets and security groups for the Lambda function.                     | `object`       | null     |    no    |
+| log_config    | Object to define logging configuration of the Lambda function to CloudWatch.                  | `object`       | null     |    no    |
+| image         | Object of the image which will be pulled by the Lambda function to execute.                   | `object`       | null     |    no    |
+| architecture  | Instruction set architecture for the Lambda function. Valid values are: 'x86_64' and 'arm64'. | `string`       | "x86_64" |    no    |
+| memory_size   | Amount of memory in MB the Lambda function can use at runtime.                                | `number`       | 128      |    no    |
+| timeout       | Amount of time the Lambda function has to run in seconds.                                     | `number`       | 3        |    no    |
+| env_variables | A map of environment variables for the Lambda function at runtime.                            | `map(string)`  | {}       |    no    |
+| tags          | A map of tags to add to all resources.                                                        | `map(string)`  | {}       |    no    |
 
 ### `vpc_config`
 
@@ -67,9 +68,11 @@ This module provides a Lambda function which logs to CloudWatch. If no image URI
 module "function" {
   source = "github.com/custom-terraform-aws-modules/function"
 
-  identifier  = "example-function-dev"
-  memory_size = 128
-  timeout     = 3
+  identifier   = "example-function-dev"
+  architecture = "x86_64"
+  memory_size  = 128
+  timeout      = 3
+
   policies = [
     "arn:aws:iam::aws:policy/aws-service-role/AccessAnalyzerServiceRolePolicy",
     "arn:aws:iam::aws:policy/AdministratorAccess-Amplify"

main.tf

@@ -119,6 +119,7 @@ resource "aws_lambda_function" "main" {
   image_uri     = var.image == null ? "${aws_ecr_repository.main[0].repository_url}:latest" : try(var.image["uri"], null)
   memory_size   = var.memory_size
   timeout       = var.timeout
+  architectures = [var.architecture]
 
   environment {
     variables = var.env_variables

tests/lambda.tftest.hcl

@@ -25,6 +25,26 @@ run "valid_identifier" {
   }
 }
 
+run "invalid_architecture" {
+  command = plan
+
+  variables {
+    identifier   = "abc"
+    architecture = "test_64"
+  }
+
+  expect_failures = [var.architecture]
+}
+
+run "valid_architecture" {
+  command = plan
+
+  variables {
+    identifier   = "abc"
+    architecture = "arm64"
+  }
+}
+
 run "invalid_vpc_subnets" {
   command = plan
 

variables.tf

@@ -57,6 +57,16 @@ variable "image" {
   default = null
 }
 
+variable "architecture" {
+  description = "Instruction set architecture for the Lambda function. Valid values are: 'x86_64' and 'arm64'."
+  type        = string
+  default     = "x86_64"
+  validation {
+    condition     = var.architecture == "x86_64" || var.architecture == "arm64"
+    error_message = "Architecture must be either 'x86_64' or 'arm64'"
+  }
+}
+
 variable "memory_size" {
   description = "Amount of memory in MB the Lambda function can use at runtime."
   type        = number