feat: Support arm64 lambda functions (#2121)

* feat: Support arm64 lambda functions

* chore: Default to existing behavior, update readme

* chore: terraform fmt, add validation to lambda architecture, update description

* feat: Add arm64 support to pool lambda

* fix: Wrong variable name in the lambda function

* fix: var.config.lambda_architecture instead of var.lambda_architecture in lambda pool

* fix: It should have been lambda.architecture not lambda_architecture.

* chore: Change default to x86_64

Co-authored-by: Niek Palm <[email protected]>

* chore: Change default to x86_64

Co-authored-by: Niek Palm <[email protected]>

* chore: Change default to x86_64

Co-authored-by: Niek Palm <[email protected]>

* chore: Change default to x86_64

Co-authored-by: Niek Palm <[email protected]>

Co-authored-by: Niek Palm <[email protected]>

Author: dylanmtaylor

Diff for: README.md

@@ -428,6 +428,7 @@ In case the setup does not work as intended follow the trace of events:
 | <a name="input_kms_key_arn"></a> [kms\_key\_arn](#input\_kms\_key\_arn) | Optional CMK Key ARN to be used for Parameter Store. This key must be in the current account. | `string` | `null` | no |
 | <a name="input_lambda_principals"></a> [lambda\_principals](#input\_lambda\_principals) | (Optional) add extra principals to the role created for execution of the lambda, e.g. for local testing. | <pre>list(object({<br>    type        = string<br>    identifiers = list(string)<br>  }))</pre> | `[]` | no |
 | <a name="input_lambda_runtime"></a> [lambda\_runtime](#input\_lambda\_runtime) | AWS Lambda runtime. | `string` | `"nodejs14.x"` | no |
+| <a name="input_lambda_architecture"></a> [lambda\_architecture](#input\_lambda\_architecture) | AWS Lambda architecture. | `string` | `"x86_64"` | no |
 | <a name="input_lambda_s3_bucket"></a> [lambda\_s3\_bucket](#input\_lambda\_s3\_bucket) | S3 bucket from which to specify lambda functions. This is an alternative to providing local files directly. | `any` | `null` | no |
 | <a name="input_lambda_security_group_ids"></a> [lambda\_security\_group\_ids](#input\_lambda\_security\_group\_ids) | List of security group IDs associated with the Lambda function. | `list(string)` | `[]` | no |
 | <a name="input_lambda_subnet_ids"></a> [lambda\_subnet\_ids](#input\_lambda\_subnet\_ids) | List of subnets in which the action runners will be launched, the subnets needs to be subnets in the `vpc_id`. | `list(string)` | `[]` | no |

Diff for: main.tf

@@ -103,6 +103,7 @@ module "webhook" {
   webhook_lambda_s3_key            = var.webhook_lambda_s3_key
   webhook_lambda_s3_object_version = var.webhook_lambda_s3_object_version
   lambda_runtime                   = var.lambda_runtime
+  lambda_architecture              = var.lambda_architecture
   lambda_zip                       = var.webhook_lambda_zip
   lambda_timeout                   = var.webhook_lambda_timeout
   logging_retention_in_days        = var.logging_retention_in_days
@@ -169,6 +170,7 @@ module "runners" {
   runners_lambda_s3_key            = var.runners_lambda_s3_key
   runners_lambda_s3_object_version = var.runners_lambda_s3_object_version
   lambda_runtime                   = var.lambda_runtime
+  lambda_architecture              = var.lambda_architecture
   lambda_zip                       = var.runners_lambda_zip
   lambda_timeout_scale_up          = var.runners_scale_up_lambda_timeout
   lambda_timeout_scale_down        = var.runners_scale_down_lambda_timeout
@@ -229,6 +231,7 @@ module "runner_binaries" {
   syncer_lambda_s3_key            = var.syncer_lambda_s3_key
   syncer_lambda_s3_object_version = var.syncer_lambda_s3_object_version
   lambda_runtime                  = var.lambda_runtime
+  lambda_architecture             = var.lambda_architecture
   lambda_zip                      = var.runner_binaries_syncer_lambda_zip
   lambda_timeout                  = var.runner_binaries_syncer_lambda_timeout
   logging_retention_in_days       = var.logging_retention_in_days

Diff for: modules/runner-binaries-syncer/runner-binaries-syncer.tf

@@ -19,6 +19,7 @@ resource "aws_lambda_function" "syncer" {
   runtime           = var.lambda_runtime
   timeout           = var.lambda_timeout
   memory_size       = 256
+  architectures     = [var.lambda_architecture]
 
   environment {
     variables = {

Diff for: modules/runner-binaries-syncer/variables.tf

@@ -187,3 +187,13 @@ variable "lambda_runtime" {
   type        = string
   default     = "nodejs14.x"
 }
+
+variable "lambda_architecture" {
+  description = "AWS Lambda architecture. Lambda functions using Graviton processors ('arm64') tend to have better price/performance than 'x86_64' functions. "
+  type        = string
+  default     = "x86_64"
+  validation {
+    condition     = contains(["arm64", "x86_64"], var.lambda_architecture)
+    error_message = "`lambda_architecture` value is not valid, valid values are: `arm64` and `x86_64`."
+  }
+}

Diff for: modules/runners/pool.tf

@@ -26,6 +26,7 @@ module "pool" {
       s3_object_version              = var.runners_lambda_s3_object_version
       security_group_ids             = var.lambda_security_group_ids
       subnet_ids                     = var.lambda_subnet_ids
+      architecture                   = var.lambda_architecture
       runtime                        = var.lambda_runtime
       timeout                        = var.pool_lambda_timeout
       zip                            = local.lambda_zip

Diff for: modules/runners/pool/main.tf

@@ -8,6 +8,7 @@ resource "aws_lambda_function" "pool" {
   function_name                  = "${var.config.prefix}-pool"
   role                           = aws_iam_role.pool.arn
   handler                        = "index.adjustPool"
+  architectures                  = [var.config.lambda.architecture]
   runtime                        = var.config.lambda.runtime
   timeout                        = var.config.lambda.timeout
   reserved_concurrent_executions = var.config.lambda.reserved_concurrent_executions

Diff for: modules/runners/pool/variables.tf

@@ -11,6 +11,7 @@ variable "config" {
       s3_object_version              = string
       security_group_ids             = list(string)
       runtime                        = string
+      architecture                   = string
       timeout                        = number
       zip                            = string
       subnet_ids                     = list(string)

Diff for: modules/runners/scale-down.tf

@@ -18,6 +18,7 @@ resource "aws_lambda_function" "scale_down" {
   timeout           = var.lambda_timeout_scale_down
   tags              = local.tags
   memory_size       = 512
+  architectures     = [var.lambda_architecture]
 
   environment {
     variables = {

Diff for: modules/runners/scale-up.tf

@@ -12,6 +12,7 @@ resource "aws_lambda_function" "scale_up" {
   reserved_concurrent_executions = var.scale_up_reserved_concurrent_executions
   memory_size                    = 512
   tags                           = local.tags
+  architectures                  = [var.lambda_architecture]
 
   environment {
     variables = {

Diff for: modules/runners/variables.tf

@@ -551,3 +551,13 @@ variable "lambda_runtime" {
   type        = string
   default     = "nodejs14.x"
 }
+
+variable "lambda_architecture" {
+  description = "AWS Lambda architecture. Lambda functions using Graviton processors ('arm64') tend to have better price/performance than 'x86_64' functions. "
+  type        = string
+  default     = "x86_64"
+  validation {
+    condition     = contains(["arm64", "x86_64"], var.lambda_architecture)
+    error_message = "`lambda_architecture` value is not valid, valid values are: `arm64` and `x86_64`."
+  }
+}

Diff for: modules/webhook/variables.tf

@@ -162,3 +162,13 @@ variable "lambda_runtime" {
   type        = string
   default     = "nodejs14.x"
 }
+
+variable "lambda_architecture" {
+  description = "AWS Lambda architecture. Lambda functions using Graviton processors ('arm64') tend to have better price/performance than 'x86_64' functions. "
+  type        = string
+  default     = "x86_64"
+  validation {
+    condition     = contains(["arm64", "x86_64"], var.lambda_architecture)
+    error_message = "`lambda_architecture` value is not valid, valid values are: `arm64` and `x86_64`."
+  }
+}

Diff for: modules/webhook/webhook.tf

@@ -9,6 +9,7 @@ resource "aws_lambda_function" "webhook" {
   handler           = "index.githubWebhook"
   runtime           = var.lambda_runtime
   timeout           = var.lambda_timeout
+  architectures     = [var.lambda_architecture]
 
   environment {
     variables = {

Diff for: variables.tf

@@ -641,3 +641,13 @@ variable "lambda_runtime" {
   type        = string
   default     = "nodejs14.x"
 }
+
+variable "lambda_architecture" {
+  description = "AWS Lambda architecture. Lambda functions using Graviton processors ('arm64') tend to have better price/performance than 'x86_64' functions. "
+  type        = string
+  default     = "x86_64"
+  validation {
+    condition     = contains(["arm64", "x86_64"], var.lambda_architecture)
+    error_message = "`lambda_architecture` value is not valid, valid values are: `arm64` and `x86_64`."
+  }
+}