feat: Support deployment package via S3

Author: baolsen

main.tf

@@ -137,6 +137,10 @@ resource "aws_lambda_function" "this" {
   # configuration and Terraform will show a perpetual difference of adding the key.
   kms_key_arn = var.environment == null ? null : var.lambda_kms_key_arn
 
+  s3_bucket         = var.s3_bucket
+  s3_key            = var.s3_key
+  s3_object_version = var.s3_object_version
+
   tags = var.tags
 
   lifecycle {

s3.tf

@@ -0,0 +1,15 @@
+locals {
+  create_s3_object = (
+    !(var.s3_bucket == null || var.s3_key == null || var.output_path == null)
+  )
+}
+
+resource "aws_s3_object" "this" {
+  count = var.create_s3_object ? 1 : 0
+
+  bucket = var.s3_bucket
+  key    = var.s3_key
+  source = var.output_path
+
+  etag = filemd5(var.output_path)
+}

variables.tf

@@ -27,18 +27,38 @@ variable "build_triggers" {
 }
 
 variable "source_dir" {
-  description = "A path to the directory which contains source files to be archived. If set to `null`, then no archive file is created."
+  description = "A path to the directory which contains source files to be archived into a deployment package. If set to `null`, then no archive file is created."
   type        = string
+  default     = null
 }
 
 variable "output_path" {
-  description = "A path to the archive file which will be uploaded to AWS. If `source_dir` is not `null`, then a file is created at `output_path` containing the archived contents of `source_dir`."
+  description = "A path to the deployment archive which will be uploaded to AWS. If `source_dir` is not `null`, then a file is created at `output_path` containing the archived contents of `source_dir`."
+  type        = string
+  default     = null
+}
+
+variable "s3_bucket" {
+  description = "An existing S3 bucket, containing the function's deployment package. If `output_path` is also specified, the archive will be uploaded here."
+  type        = string
+  default     = null
+}
+
+variable "s3_key" {
+  description = "S3 key of an object containing the function's deployment package. If `output_path` is also specified, the archive will be uploaded here."
   type        = string
+  default     = null
+}
+
+variable "s3_object_version" {
+  description = "S3 object version containing the function's deployment package."
+  type        = string
+  default     = null
 }
 
 variable "exclude_files" {
   description = <<DESC
-A list of directories or folders to ignore, e.g.
+A list of source directories or folders to ignore when creating the archive, e.g.
 exclude_files = ["test", "src/**/*.ts"]
 DESC
   type        = list(string)