Indorse Project

Requirements

1. Lambda to create user profile. User profile will include user_id, name, email, mobile number, address, company, title
2. Lambda to update user profile when the email or mobile number matches in the incoming api request
3. Lambda to update user interests including sports, food, media and more. Come up with relevant fields that can be added to user profile and add the same as parameter for the function
4. All data should go to AWS Dynamo DB
5. Configure AWS API gateway and create relevant APIs for create and update user records. Configure security for the API and configure rate limiting for the APIs
6. Use async/await calls in the Node JS functions
7. Add relevant code comments and modularise the code properly. Create more than one Lambda wherever required and make inter Lambda calls if required
8. Write an automated test for this lambda

DynamoDB:

DynamoDB is Amazon AWS's NoSQL database. Download a local DynamoDB to Start a local instance https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DynamoDBLocal.DownloadingAndRunning.html

Start DynamoDB:

java -Djava.library.path=./DynamoDBLocal_lib -jar DynamoDBLocal.jar -sharedDb

For this project, we need a table TB_USER created in DynamoDB. The table schema is available in config/schemas directory

Drop Table (if already exists)

aws dynamodb delete-table --table-name TB_USER --endpoint-url http://localhost:8000

Creating Table

Go to the config/schemas directory and execute the below command:

aws dynamodb create-table --cli-input-json file://indorse_tb_user.json --endpoint-url http://localhost:8000

List Tables

aws dynamodb list-tables --endpoint-url http://localhost:8000

Node Application

This is NodeJS REST application which is running under Express Server.

To make a NodeJS Express server, AWS Lambda compatible, we need to make few modification in code base. ClaudiaJS is a awesome tool to convert a Node Express application into a AWS Lambda serverless application.

Install ClaudiaJS using npm:

npm install claudia -g

Generate Serverless Express Application using ClaudiaJS

claudia generate-serverless-express-proxy --express-module index

This will generate a file claudia.json which will have AWS Role, Lamdba Function Name and Region information.

Here index is the main script name without the extension (index.js). But this index.js will not work in your local development machine. Which is why index.local.js is created and referred in package.json

Deploy Application in a specific AWS zone

claudia create --handler lambda.handler --deploy-proxy-api --region ap-southeast-1

This will create a AWS Lambda function, provided that you have AWSCLI installed and configured in local system

Test

This Lambda function require few environment variables to be set:

Variable Name	Value
APP_ENV	production
ACCESS_KEY	{ACCESS_KEY}
ACCESS_SECRET	{ACCESS_SECRET}

Publish below command to re-deploy:

claudia update

Sample Payload

{
    "ADDRESS": "Bedok",
    "USER_ID": "user456",
    "TITLE": "Ms",
    "EMAIL": "mariana@dummydomain.com",
    "NAME": "Mariana Khan",
    "MOBILE": "986798590",
    "COMPANY": "CDE",
    "INTEREST": [
        {
            "FOOD": "Tea"
        },
        {
            "SPORTS": "Cricket,Football"
        }
    ]
}

Test API in AWS Lambda:

Get all users:

GET https://fjthw9cb9i.execute-api.ap-southeast-1.amazonaws.com/latest/api/user

Get a particular user

GET https://fjthw9cb9i.execute-api.ap-southeast-1.amazonaws.com/latest/api/user/{user_id}

Save an user

POST https://fjthw9cb9i.execute-api.ap-southeast-1.amazonaws.com/latest/api/user

Update an user

PUT https://fjthw9cb9i.execute-api.ap-southeast-1.amazonaws.com/latest/api/{user_id}

Test API in Local

Get all users:

GET http://localhost:5000/api/user

Get a particular user

GET http://localhost:5000/api/user/{user_id}

Save an user

POST http://localhost:5000/api/user

Update an user

PUT http://localhost:5000/api/{user_id}

Lambda API Gateway

aws apigateway get-resources --rest-api-id tbi0iswybg --region ap-southeast-1