The code gets as param a country name and a desired status. It checks for the Australian immigration portal around that country status (closed or open). If the current status == desired status, then it notifies the email set in the config of this repo.

This project uses a simple DynamoDB table to keep track of the last status update. This means the code will send the alert after status change ONCE. After that, the state table will already have the latest status and the alert will only be sent when there is a status change again. This was implemented to prevent triggering an immense quantity of alerts, as this lambda is meant to be run many times per day.

A template for the config file will be found in cdk/config. Use this template and create a config.ts in the same folder with the following information:

• URL: This is already populated with the Australian Immigration portal
• DESIRED_COUNTRY: The name of the country to be monitored (as it is in the portal)
• DESIRED_STATUS: open or closed

Disclamer: This code does not support other types of status

• ACCOUNT_ID and REGION: The id and region of AWS account
• EMAIL: The email of the receiver of the notifications
• SCHEDULE_MINUTES: An integer number representing the amount of minutes between every check

1. Create an AWS Account
2. Inside your AWS Account, setup a new user with programmatic access
3. Install AWS CLI
4. Run aws configure --profile <given_profile_name> to login with your created user. If unsure, use https://docs.aws.amazon.com/cli/v1/userguide/cli-authentication-user.html as guide
5. Depending on the auth method you choose to use (role, user...) you might need to generate a user token and update your .aws/credentials file
6. Update the config.ts file with the account id and region you wish the deploy

1. Make sure node and npm are correctly installed in your environment. You will need npm to install and build the stack generated by AWS CDK

Use this as guide: https://docs.aws.amazon.com/cdk/v2/guide/prerequisites.html

1. Make sure you update the config.ts file with all the needed variables
2. npm install
3. npm build && npm test
4. npx cdk synth --profile <given_profile_name> --> just to check for any AWS auth errors
5. npx cdk deploy --profile <given_profile_name>

• Lambda: 1 million free requests per month. Considering a month of 31 days (44640 minutes). If you run the schedule every 5min, you do almost 9 thousand requests in the month. Still plenty left
• DynamoDB: 25 provisioned read and write capacity for free. Each request only requires 2 read capacity and maybe more for write if it gets updated
• SNS: Up until 1k email deliveries and publishes for free
• Eventbridge: 14 million schedule invocations free per month

https://aws.amazon.com/free/