Agile alerter

Email you the next days' Octopus Agile prices every evening.

This is a serverless application that runs on AWS. It uses AWS EventBridge Scheduler to trigger a Lambda function at 8PM every day. This Lambda calls the Octopus API to get pricing for the next day and sends the message to SNS. The user's email is subscribed to the SNS topic to deliver the alert.

At time of writing (Oct 2024) most resource usage from this application falls within the AWS free tier but this may change at any point. Lambda has no free tier but the compute usage of 31 invocations per month is effectively free. I am not liable for any costs you may incur from using this application.

To help prevent excessive costs, this application also deploys a budget alert for when total spend in a month exceeds $10.

How to deploy

Requirements

• Python
• Terraform
• AWS CLI with appropriate credentials configured

Instructions

Switch to the infra directory

cd infra

Copy example.tfvars to production.auto.tfvars

cp example.tfvars production.auto.tfvars

Then fill in the variables with your email address and account region.

Now you're ready to run Terraform

terraform init
terraform apply

The application subscribes the provided email to an SNS topic. Once deployed you'll be emailed a confirmation link. You must click this link before you receive any emails.

Developing

source venv/bin/activate

Unit tests for the Lambda use Pytest. From the project root run

pytest

TODO

• Make the budget alert optional
• Make the budget alert filter by tag
• Allow users to pick a different timezone