Nasa Image Fetcher utilizing AWS and Serverless framework

Features

The entire program is chained together with AWS Lambda functions that trigger themselves one by one every day at 12PM using cron:

• Fetch picture of the day from NASA APOD API using axios library
• Update DynamoDB tables and create S3 bucket objects
• Generate S3 presigned URLs to download the images
• Send and receive messages with SQS queues using DynamoDB streams
• Use message content to receive and email about APOD every day at a desired time
• Generate and access an HTTP endpoint that displays images from the last 7 days

Installation

Requires Node and npm alongside a few npm packages:

cd nasa-image-fetcher
npm i axios
npm i serverless

To create a Serverless project and deploy it to AWS, run

serverless
sls deploy

Lambda Functions

The code is composed out of 6 Lambda functions that do all the work. All of them are located in the functions/ folder.

Function	Usage
fetchImage	use axios to get image data and insert into dynamoDB
bucketInsert	get dynamoDB record and create s3 bucket object
addColumn	get new s3 bucket object, create presigned url and update dynamoDB record
sqSend	get dynamoDB record and send it to sqs queue
sqsReceive	receive message from sqs queue, create and send an email
endpoint	renders an html with pictures from the last 7 days via API gateway invocation url

Personal usage

You will need to update environment function variables in the $serverless.yml file with your own data before deployment:

• Your own NASA API key
• Your own table and bucket names
• Your own sqs queue url and arn
• Your own email