AWS Serverless Feedback Demo

Introduction

AWS Demo using S3, API Gateway, NodeJS, Lambda and DynamoDB Also uses Terraform to Create the web site on AWS

This demo shows how to host a Dynamic Web Site on static AWS Simple Storage Service (S3) using jQuery .getJSON function to call API Gateway. The API Gateway uses Lambda functions written on node.js to store feedback in DynamoDB.

• No Servers to build
• No Build or Build Pipeline

Author

Keith Johnson

URL

Manual: http://demo-feedback.s3-website-eu-west-1.amazonaws.com/ Terraform: http://demo-feedback3.s3-website-eu-west-1.amazonaws.com/

Status

In Progress

To Do

1. The API Gateway require Enables CORS to prevent access control problems.

Technology

Uses AWS Serverless Technology DynamoDB, Lambda, API Gateway, S3 and IAM for Roles. NodeJS for implementation of Lambda Functions HTML, Javascript, JQuery and JQuery Mobile Terraform for automated deployment into AWS

DynamoDB

Lambda

API Gateway

S3

IAM Roles

Notes (Below are Notes still to be written up)

AWS Feedback Site

Create Lambda

Name: FeedbackLambda Runtime: NodeJS Handler: feedback.handler Role: lambda_basic_execution Description: Code: /lambda-functions/feedback-lambda/app.js

Test JSON { "score": 5, "feedback": "excellent" }

API Gateway

New API

API Name: FeedbackAPI Description Feedback API

Model

Model Name: FeedbackModel Content Type: application/json Description: Feedback Model Model Schema: /api-gateway/feedback-model.txt

Stage

Stage: feedback Invoke URL: https://eajybqsd7b.execute-api.eu-west-1.amazonaws.com/feedback/?score=1&feedback=Hello

GET

Resources: Integration Request Content Type: application/json Input Mapping: /api-gateway/input-mapping.txt

Chrome Postman Post: https://eajybqsd7b.execute-api.eu-west-1.amazonaws.com/feedback Body: raw JSON(application/json)

POST Setup

Integration Type: Lambda Function Lambda Region: eu-west-1 Lambda function: FeedbackHandler

POST - Method Request

Request Models: Add Model: ContentType: application/json ModelName: FeedbackModel

Aggregate Lambda Name: FeedbackAggregatesLambda Code: /lambda-functions/feedback-aggregates-lambda/app.js

DynamoDB

Feedback feedbackScore FeedbackAggregates feedbackScore

DynamoDB Scan Example Name: FeedbackAggregatesScanAllLambda Code: /lambda-functions/feedback-aggregates-scan-all-lambda/app.js

https://eajybqsd7b.execute-api.eu-west-1.amazonaws.com/feedback/totals http://demo-feedback.s3-website-eu-west-1.amazonaws.com/

S3 Files

/html/index.html

Reference

AWS Labs Project https://github.com/keithsjohnson/lambda-refarch-webapp

https://github.com/awslabs/lambda-apigateway-twilio-tutorial

https://github.com/awslabs/lambda-refarch-fileprocessing

Creating Lambda Zip Files

See: https://docs.aws.amazon.com/lambda/latest/dg/nodejs-create-deployment-pkg.html

Install nodejs and npm from https://nodejs.org/en/download/

cd C:\Users\Keith\git\AWSServerlessFeedbackDemo\lambda-functions\feedback-lambda npm install async

cd C:\Users\Keith\git\AWSServerlessFeedbackDemo\lambda-functions\feedback-aggregates-lambda npm install async

cd C:\Users\Keith\git\AWSServerlessFeedbackDemo\lambda-functions\feedback-aggregates-scan-all-lambda npm install async

Terraform Links

AWS Modules Link https://www.terraform.io/docs/providers/aws/index.html

Terraform GitHub Community Modules Link https://github.com/terraform-community-modules