feat: introduce feature flag lab

2-simple-api/README.md

@@ -9,7 +9,9 @@ In the first lab, we bootstrapped Terraform and created some resources. Finally,
 3. Add the following lines to the JS file:
   ```js
   exports.handler = async () => {
-    return { "message": process.env.RESPONSE };
+    return { 
+      message: "Hello from Lambda! 👋"
+    };
   };
   ```
 4. Now, go back to the `main.tf` file and replace it:
@@ -52,9 +54,6 @@ In the first lab, we bootstrapped Terraform and created some resources. Finally,
     handler       = "helloworld.handler"
     runtime       = "nodejs12.x"
     source_path   = "./functions"
-    environment_variables = {
-      "RESPONSE" = "Hello from Lambda! 👋"
-    }
   }
   ```
 5. Run `terraform init`, then `terraform apply`, and confirm the changes with `yes`.
@@ -111,9 +110,6 @@ So, the Lambda function is in place and we can go to the next component: The API
     handler       = "helloworld.handler"
     runtime       = "nodejs12.x"
     source_path   = "./functions"
-    environment_variables = {
-      "RESPONSE" = "Hello from Lambda! 👋"
-    }
 
     publish = true
     allowed_triggers = {

2-simple-api/functions/helloworld.js

@@ -1,3 +1,5 @@
 exports.handler = async () => {
-  return { "message": process.env.RESPONSE };
+  return { 
+    message: "Hello from Lambda! 👋"
+  };
 };

2-simple-api/main.tf

@@ -36,9 +36,6 @@ module "lambda_function" {
   handler       = "helloworld.handler"
   runtime       = "nodejs12.x"
   source_path   = "./functions"
-  environment_variables = {
-    "RESPONSE" = "Hello from Lambda! 👋"
-  }
 
   publish = true
   allowed_triggers = {

3-environments/modules/api/functions/helloworld.js

@@ -1,3 +1,5 @@
 exports.handler = async () => {
-  return { "message": process.env.RESPONSE };
+  return { 
+    message: "Hello from Lambda! 👋"
+  };
 };

3-environments/modules/api/main.tf

@@ -9,9 +9,6 @@ module "lambda_function" {
   handler       = "helloworld.handler"
   runtime       = "nodejs12.x"
   source_path   = "${path.module}/functions"
-  environment_variables = {
-    "RESPONSE" = var.lambda_function_response
-  }
 
   publish = true
   allowed_triggers = {

3-environments/modules/api/variables.tf

@@ -1,9 +1,3 @@
-variable "lambda_function_response" {
-  type = string
-  description = "Body response of the hello world lambda function"
-  default = "Hello World :)"
-}
-
 variable "environment" {
   type = string
   description = "Identifier for the environment (e.g. staging, development or prod)"

4-feature-flags/modules/api/functions/helloworld.js

@@ -0,0 +1,5 @@
+exports.handler = async () => {
+  return { 
+    message: "Hello from Lambda! 👋"
+  };
+};

5-terragrunt/modules/api/main.tf → 4-feature-flags/modules/api/main.tf

@@ -9,9 +9,6 @@ module "lambda_function" {
   handler       = "helloworld.handler"
   runtime       = "nodejs12.x"
   source_path   = "${path.module}/functions"
-  environment_variables = {
-    "RESPONSE" = var.lambda_function_response
-  }
 
   publish = true
   allowed_triggers = {

4-feature-flags/modules/website/main.tf

@@ -0,0 +1,22 @@
+data "aws_caller_identity" "current" {}
+
+resource "aws_s3_bucket" "website" {
+  bucket = "hello-world-website-${data.aws_caller_identity.current.account_id}-${var.environment}"
+  force_destroy = true
+}
+
+resource "aws_s3_object" "startpage" {
+  bucket       = aws_s3_bucket.website.id
+  key          = "index.html"
+  source       = "${path.module}/index.html"
+  acl          = "public-read"
+  content_type = "text/html"
+}
+
+resource "aws_s3_bucket_website_configuration" "website" {
+  bucket = aws_s3_bucket.website.bucket
+
+  index_document {
+    suffix = "index.html"
+  }
+}

4-feature-flags/prod/main.tf

@@ -0,0 +1,20 @@
+terraform {
+  required_version = "~> 1.1.7"
+}
+
+provider "aws" {
+  region = "eu-west-1"
+}
+
+module "website" {
+  source = "../modules/website"
+
+  environment = "prod"
+}
+
+module "api" {
+  source = "../modules/api"
+
+  lambda_function_response = "Hello from Prod 👋"
+  environment = "prod"
+}

4-feature-flags/staging/main.tf

@@ -0,0 +1,20 @@
+terraform {
+  required_version = "~> 1.1.7"
+}
+
+provider "aws" {
+  region = "eu-west-1"
+}
+
+module "website" {
+  source = "../modules/website"
+
+  environment = "staging"
+}
+
+module "api" {
+  source = "../modules/api"
+
+  lambda_function_response = "Hello from Staging 👋"
+  environment = "staging"
+}

5-remote-backend/modules/api/functions/helloworld.js

@@ -0,0 +1,5 @@
+exports.handler = async () => {
+  return { 
+    message: "Hello from Lambda! 👋"
+  };
+};

4-remote-backend/modules/api/main.tf → 5-remote-backend/modules/api/main.tf

@@ -9,9 +9,6 @@ module "lambda_function" {
   handler       = "helloworld.handler"
   runtime       = "nodejs12.x"
   source_path   = "${path.module}/functions"
-  environment_variables = {
-    "RESPONSE" = var.lambda_function_response
-  }
 
   publish = true
   allowed_triggers = {

5-remote-backend/modules/api/variables.tf

@@ -0,0 +1,4 @@
+variable "environment" {
+  type        = string
+  description = "Identifier for the environment (e.g. staging, development or prod)"
+}

5-remote-backend/modules/website/variables.tf

@@ -0,0 +1,4 @@
+variable "environment" {
+  type = string
+  description = "Identifier for the environment (e.g. staging, development or prod)"
+}

5-remote-backend/prod/outputs.tf

@@ -0,0 +1,9 @@
+output "api_url" {
+  description = "Hello World API URL"
+  value       = module.api.url
+}
+
+output "website_url" {
+  description = "Static Website URL"
+  value       = module.website.url
+}

5-remote-backend/staging/outputs.tf

@@ -0,0 +1,9 @@
+output "api_url" {
+  description = "Hello World API URL"
+  value       = module.api.url
+}
+
+output "website_url" {
+  description = "Static Website URL"
+  value       = module.website.url
+}

6-terragrunt/modules/api/functions/helloworld.js

@@ -0,0 +1,5 @@
+exports.handler = async () => {
+  return { 
+    message: "Hello from Lambda! 👋"
+  };
+};

6-terragrunt/modules/api/main.tf

@@ -0,0 +1,26 @@
+locals {
+  project_name = "hello-world"
+}
+
+module "lambda_function" {
+  source = "terraform-aws-modules/lambda/aws"
+
+  function_name = "${local.project_name}-${var.environment}"
+  handler       = "helloworld.handler"
+  runtime       = "nodejs12.x"
+  source_path   = "${path.module}/functions"
+
+  publish = true
+  allowed_triggers = {
+    AllowExecutionFromAPIGateway = {
+      service    = "apigateway"
+      source_arn = "${aws_apigatewayv2_api.hello_world.execution_arn}/*/*"
+    }
+  }
+}
+
+resource "aws_apigatewayv2_api" "hello_world" {
+  name          = "${local.project_name}-${var.environment}"
+  protocol_type = "HTTP"
+  target        = module.lambda_function.lambda_function_arn
+}

6-terragrunt/modules/api/outputs.tf

@@ -0,0 +1,4 @@
+output "url" {
+  description = "Hello World API URL"
+  value       = aws_apigatewayv2_api.hello_world.api_endpoint
+}

6-terragrunt/modules/api/variables.tf

@@ -0,0 +1,4 @@
+variable "environment" {
+  type = string
+  description = "Identifier for the environment (e.g. staging, development or prod)"
+}

6-terragrunt/modules/website/index.html

@@ -0,0 +1,6 @@
+<!DOCTYPE html>
+<html>
+  <body>
+    <h1>Hello World :)</h1>
+  </body>
+</html>

6-terragrunt/modules/website/outputs.tf

@@ -0,0 +1,3 @@
+output "url" {
+  value = "http://${aws_s3_bucket_website_configuration.website.website_endpoint}"
+}

6-terragrunt/modules/website/variables.tf

@@ -0,0 +1,4 @@
+variable "environment" {
+  type = string
+  description = "Identifier for the environment (e.g. staging, development or prod)"
+}