feat(feature flag): greeting feature

2-simple-api/README.md

@@ -52,7 +52,7 @@ 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"
   }
   ```
@@ -108,7 +108,7 @@ 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"
 
     publish = true

2-simple-api/main.tf

@@ -34,7 +34,7 @@ module "lambda_function" {
 
   function_name = "hello-world"
   handler       = "helloworld.handler"
-  runtime       = "nodejs12.x"
+  runtime       = "nodejs14.x"
   source_path   = "./functions"
 
   publish = true

3-environments/modules/api/main.tf

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

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

@@ -1,5 +1,12 @@
-exports.handler = async () => {
-  return { 
-    message: "Hello from Lambda! 👋"
-  };
+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-feature-flags/modules/api/main.tf

@@ -7,8 +7,11 @@ module "lambda_function" {
 
   function_name = "${local.project_name}-${var.environment}"
   handler       = "helloworld.handler"
-  runtime       = "nodejs12.x"
+  runtime       = "nodejs14.x"
   source_path   = "${path.module}/functions"
+  environment_variables = {
+    GREETING_ENABLED = "${var.enable_greeting}"
+  }
 
   publish = true
   allowed_triggers = {

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

@@ -2,3 +2,9 @@ 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/prod/main.tf

@@ -8,13 +8,12 @@ provider "aws" {
 
 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

@@ -8,13 +8,13 @@ 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/modules/api/functions/helloworld.js

@@ -1,5 +1,12 @@
-exports.handler = async () => {
-  return { 
-    message: "Hello from Lambda! 👋"
-  };
+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-remote-backend/modules/api/main.tf

@@ -7,8 +7,11 @@ module "lambda_function" {
 
   function_name = "${local.project_name}-${var.environment}"
   handler       = "helloworld.handler"
-  runtime       = "nodejs12.x"
+  runtime       = "nodejs14.x"
   source_path   = "${path.module}/functions"
+  environment_variables = {
+    GREETING_ENABLED = "${var.enable_greeting}"
+  }
 
   publish = true
   allowed_triggers = {

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

@@ -2,3 +2,9 @@ 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
+}

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/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
 }

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

@@ -1,5 +1,12 @@
-exports.handler = async () => {
-  return { 
-    message: "Hello from Lambda! 👋"
-  };
+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 };
 };

6-terragrunt/modules/api/main.tf

@@ -7,8 +7,11 @@ module "lambda_function" {
 
   function_name = "${local.project_name}-${var.environment}"
   handler       = "helloworld.handler"
-  runtime       = "nodejs12.x"
+  runtime       = "nodejs14.x"
   source_path   = "${path.module}/functions"
+  environment_variables = {
+    GREETING_ENABLED = "${var.enable_greeting}"
+  }
 
   publish = true
   allowed_triggers = {

6-terragrunt/modules/api/variables.tf

@@ -1,4 +1,10 @@
 variable "environment" {
-  type = string
+  type        = string
   description = "Identifier for the environment (e.g. staging, development or prod)"
 }
+
+variable "enable_greeting" {
+  type        = bool
+  description = "Enable greeting feature"
+  default     = false
+}

6-terragrunt/prod/api/terragrunt.hcl

@@ -7,6 +7,5 @@ terraform {
 }
 
 inputs = {
-  lambda_function_response = "Hello from Prod 👋"
   environment = "prod"
 }

6-terragrunt/staging/api/terragrunt.hcl

@@ -7,6 +7,6 @@ terraform {
 }
 
 inputs = {
-  lambda_function_response = "Hello from Staging 👋"
   environment = "staging"
+  enable_greeting = true
 }