Merge pull request #2 from superluminar-io/feature-flags

feat: 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:
@@ -50,11 +52,8 @@ In the first lab, we bootstrapped Terraform and created some resources. Finally,
 
     function_name = "hello-world"
     handler       = "helloworld.handler"
-    runtime       = "nodejs12.x"
+    runtime       = "nodejs14.x"
     source_path   = "./functions"
-    environment_variables = {
-      "RESPONSE" = "Hello from Lambda! 👋"
-    }
   }
   ```
 5. Run `terraform init`, then `terraform apply`, and confirm the changes with `yes`.
@@ -109,11 +108,8 @@ So, the Lambda function is in place and we can go to the next component: The API
 
     function_name = "hello-world"
     handler       = "helloworld.handler"
-    runtime       = "nodejs12.x"
+    runtime       = "nodejs14.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

@@ -34,11 +34,8 @@ module "lambda_function" {
 
   function_name = "hello-world"
   handler       = "helloworld.handler"
-  runtime       = "nodejs12.x"
+  runtime       = "nodejs14.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

@@ -7,11 +7,8 @@ module "lambda_function" {
 
   function_name = "${local.project_name}-${var.environment}"
   handler       = "helloworld.handler"
-  runtime       = "nodejs12.x"
+  runtime       = "nodejs14.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 +1,12 @@
+const greetingEnabled = process.env.GREETING_ENABLED === "true";
+
+exports.handler = async (event) => {  
+  let message = "Hello from Lambda! 👋";
+  const name = event.queryStringParameters?.name;
+
+  if (greetingEnabled && name) {
+    message = `Hello ${name}! 👋`;
+  }
+
+  return { message };
+};

4-remote-backend/modules/api/main.tf → 4-feature-flags/modules/api/main.tf

@@ -7,10 +7,10 @@ module "lambda_function" {
 
   function_name = "${local.project_name}-${var.environment}"
   handler       = "helloworld.handler"
-  runtime       = "nodejs12.x"
+  runtime       = "nodejs14.x"
   source_path   = "${path.module}/functions"
   environment_variables = {
-    "RESPONSE" = var.lambda_function_response
+    GREETING_ENABLED = "${var.enable_greeting}"
   }
 
   publish = true

4-feature-flags/modules/api/variables.tf

@@ -0,0 +1,10 @@
+variable "environment" {
+  type = string
+  description = "Identifier for the environment (e.g. staging, development or prod)"
+}
+
+variable "enable_greeting" {
+  type = bool
+  description = "Enable greeting feature"
+  default = false
+}

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 +1,19 @@
+terraform {
+  required_version = "~> 1.1.7"
+}
+
+provider "aws" {
+  region = "eu-west-1"
+}
+
+module "website" {
+  source = "../modules/website"
+
+  environment = "prod"
+}
+
+module "api" {
+  source = "../modules/api"
+
+  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"
+
+  environment = "staging"
+  enable_greeting = true
+}

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

@@ -0,0 +1,12 @@
+const greetingEnabled = process.env.GREETING_ENABLED === "true";
+
+exports.handler = async (event) => {  
+  let message = "Hello from Lambda! 👋";
+  const name = event.queryStringParameters?.name;
+
+  if (greetingEnabled && name) {
+    message = `Hello ${name}! 👋`;
+  }
+
+  return { message };
+};

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

@@ -7,10 +7,10 @@ module "lambda_function" {
 
   function_name = "${local.project_name}-${var.environment}"
   handler       = "helloworld.handler"
-  runtime       = "nodejs12.x"
+  runtime       = "nodejs14.x"
   source_path   = "${path.module}/functions"
   environment_variables = {
-    "RESPONSE" = var.lambda_function_response
+    GREETING_ENABLED = "${var.enable_greeting}"
   }
 
   publish = true

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

@@ -0,0 +1,10 @@
+variable "environment" {
+  type        = string
+  description = "Identifier for the environment (e.g. staging, development or prod)"
+}
+
+variable "enable_greeting" {
+  type = bool
+  description = "Enable greeting feature"
+  default = false
+}

4-remote-backend/prod/main.tf → 5-remote-backend/prod/main.tf

@@ -21,6 +21,5 @@ module "website" {
 module "api" {
   source = "../modules/api"
 
-  lambda_function_response = "Hello from Prod 👋"
-  environment              = "prod"
+  environment = "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
+}

4-remote-backend/staging/main.tf → 5-remote-backend/staging/main.tf

@@ -14,13 +14,13 @@ provider "aws" {
 
 module "website" {
   source = "../modules/website"
-  
+
   environment = "staging"
 }
 
 module "api" {
   source = "../modules/api"
-
-  lambda_function_response = "Hello from Staging 👋"
+
   environment = "staging"
+  enable_greeting = true
 }

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 +1,12 @@
+const greetingEnabled = process.env.GREETING_ENABLED === "true";
+
+exports.handler = async (event) => {  
+  let message = "Hello from Lambda! 👋";
+  const name = event.queryStringParameters?.name;
+
+  if (greetingEnabled && name) {
+    message = `Hello ${name}! 👋`;
+  }
+
+  return { message };
+};