Serverless Web Page Change Notifier

This simple serverless Lambda application, written in Python and Terraform, regularly checks for the changes on a webpage and notifies the user using AWS SNS

📝 Table of Contents

• How it works
• How to Deploy

💭 How it works

• Lambda scraper function runs on a schedule (every 1 hour) and saves page source HTML to DynamoDB
• Using DynamoDB Streams, any changes on the page HTML gets detected. Second (notifier) Lambda function gets triggered
• Notifier Lambda function sends a message to SNS topic
• Notification gets delivered to topic subscribers

🎈 How to Deploy

First, customize the paramaters defined in template.yaml

There are 2 parts to deploy:

• Lambda functions with SAM

  cd sam/app
  

  Build:

  sam build --use-container
  

  Deploy to AWS:

  sam deploy --guided
  

  To configure and customize SAM template, see the documentation

• Other AWS Resources with Terraform

  Terraform is the Infrastructure as code (IaC) tool that I used in this proejct to manage other AWS resources.

  After configuring required backend (see here), customize the prod.tfvars file.

  cd terraform
  

  Plan to see which resources will be created:

  terraform plan --var-file=prod.tfvars
  

  Create all resources on your account:

  terraform apply --var-file=prod.tfvars