feat(builder): add npm and python

Author: sleistner

archive.tf

@@ -0,0 +1,39 @@
+resource "random_uuid" "id" {}
+
+data "null_data_source" "dist" {
+  inputs = {
+    path = abspath("${path.module}/dist/${random_uuid.id.result}")
+  }
+}
+
+data "null_data_source" "archive" {
+  inputs = {
+    path = "${data.null_data_source.dist.outputs.path}.zip"
+  }
+}
+
+resource "null_resource" "build" {
+  triggers = {
+    run = timestamp()
+  }
+
+  provisioner "local-exec" {
+    command = "${path.module}/build.sh"
+    environment = {
+      DIST_DIR     = data.null_data_source.dist.outputs.path
+      SOURCE_DIR   = var.source_dir
+      SOURCE_TYPE  = var.source_type
+      PACKAGE_FILE = var.package_file
+    }
+  }
+}
+
+data "archive_file" "layer" {
+  type        = "zip"
+  source_dir  = data.null_data_source.dist.outputs.path
+  output_path = data.null_data_source.archive.outputs.path
+
+  depends_on = [
+    null_resource.build
+  ]
+}

build.sh

@@ -0,0 +1,76 @@
+#!/usr/bin/env bash
+
+set -e
+set -o pipefail
+set -o xtrace
+
+parse_environment_variables() {
+  DIST_DIR="${DIST_DIR:?'DIST_DIR variable missing.'}"
+}
+
+clean() {
+  rm -rf "$DIST_DIR"
+}
+
+install_dependencies() {
+  case $PACKAGE_FILE in
+
+  *package.json)
+    install_npm_dependencies
+    ;;
+
+  *requirements.txt)
+    install_pip_dependencies
+    ;;
+
+  *Pipfile)
+    install_pipenv_dependencies
+    ;;
+
+  *)
+    build_from_source_dir
+    ;;
+  esac
+}
+
+install_npm_dependencies() {
+  local dist_dir="$DIST_DIR/nodejs"
+  local dist_package_file="$dist_dir/package.json"
+  mkdir -p "$dist_dir"
+
+  cp "$PACKAGE_FILE" "$dist_package_file"
+  npm install --production --prefix "$dist_dir/"
+}
+
+install_pipenv_dependencies() {
+  local dist_dir="$DIST_DIR/python"
+  local dist_requirements_file="$dist_dir/requirement.txt"
+  mkdir -p "$dist_dir"
+
+  pipenv lock --requirements >"$dist_requirements_file"
+  pip install --target "$dist_dir" --requirement="$dist_requirements_file"
+}
+
+install_pip_dependencies() {
+  local dist_dir="$DIST_DIR/python"
+  mkdir -p "$dist_dir"
+
+  pip install --target "$dist_dir" --requirement="$PACKAGE_FILE"
+}
+
+build_from_source_dir() {
+  SOURCE_DIR="${SOURCE_DIR:?'SOURCE_DIR variable missing.'}"
+  SOURCE_TYPE="${SOURCE_TYPE:?'SOURCE_TYPE variable missing.'}"
+
+  local dist_dir="$DIST_DIR/${SOURCE_TYPE}"
+  mkdir -p "$dist_dir"
+
+  pushd "${SOURCE_DIR}" >/dev/null || exit
+  # shellcheck disable=SC2086
+  rsync -Ravz ${RSYNC_PATTERN} --exclude="*" --exclude="*.*" "." "$dist_dir"
+  popd >/dev/null || exit
+}
+
+parse_environment_variables
+clean
+install_dependencies

main.tf

@@ -1,3 +1,6 @@
-resource "null_resource" "default" {
-
+resource "aws_lambda_layer_version" "main" {
+  filename            = data.archive_file.layer.output_path
+  layer_name          = var.layer_name
+  source_code_hash    = data.archive_file.layer.output_base64sha256
+  compatible_runtimes = var.compatible_runtimes
 }

output.tf

@@ -1 +1,24 @@
+output "arn" {
+  value       = aws_lambda_layer_version.main.arn
+  description = "The Amazon Resource Name (ARN) of the Lambda layer with version."
+}
 
+output "layer_arn" {
+  value       = aws_lambda_layer_version.main.layer_arn
+  description = "The Amazon Resource Name (ARN) of the Lambda layer without version."
+}
+
+output "version" {
+  value       = aws_lambda_layer_version.main.layer_arn
+  description = "The Lamba layer version."
+}
+
+output "created_date" {
+  value       = aws_lambda_layer_version.main.created_date
+  description = "The date the layer was created."
+}
+
+output "source_code_size" {
+  value       = aws_lambda_layer_version.main.source_code_size
+  description = "The size in bytes of the layer .zip file."
+}

tests/main.tf

@@ -4,6 +4,12 @@ terraform {
   backend "local" {}
 }
 
-module "module" {
-  source = "../"
+provider "aws" {
+  region = "eu-central-1"
+}
+
+module "layer" {
+  source       = "../"
+  layer_name   = "dependencies"
+  package_file = "Pipfile"
 }

variables.tf

@@ -1,5 +1,48 @@
-variable "enabled" {
-  type        = bool
-  description = "(Optional) Set whether to enable the module. Defaults to true."
-  default     = true
+variable "compatible_runtimes" {
+  type        = list(string)
+  description = "(Optional) A list of Runtimes this layer is compatible with. Up to 5 runtimes can be specified."
+
+  default = null
+}
+
+variable "layer_name" {
+  type        = string
+  description = "(Required) A unique name for the Lambda Layer."
+}
+
+variable "description" {
+  type        = string
+  description = "(Optional) Description of what the Lambda layer does."
+
+  default = null
+}
+
+variable "package_file" {
+  type        = string
+  description = "(Optional) The location of the package manager config file. Can be one of (package.json, requirements.txt, Pipfile)"
+
+  default = null
+}
+
+variable "source_dir" {
+  type        = string
+  description = "(Optional) The location of the Lamvda layer source code. Requires source_type to be defined."
+
+  default = null
+}
+
+variable "source_type" {
+  type        = string
+  description = "(Optional) The location of the Lambda layer source type. Can be one of (nodejs, python)"
+
+  default = null
+}
+
+variable "rsync_pattern" {
+  type        = list(string)
+  description = "(Optional) A list of rsync pattern to include or exclude files and directories."
+
+  default = [
+    "--include=*"
+  ]
 }