Telegram bot logic that sends daily notifications about current costs of the AWS infrastructure.

The setup is being deployed into AWS using CloudFormation. Deployed resources are:

• EventBridge rule
• SNS topic
• Lambda function that fetches current costs from AWS and publishes a message to the SNS
• Lambda function subscribed to SNS that parses the message and sends it to the telegram chat
• IAM rules for both lambdas

how to use

Follow these steps to deploy the setup:

1. Create a bot in telegram using BotFather
2. Create a chat in telegram and add the bot as an admin
3. aws cloudformation create-stack --stack-name tg-billing --template-body file://template.yaml --parameters ParameterKey=BotToken,ParameterValue='xxx:yyy' ParameterKey=TgChatId,ParameterValue='-10xxx'

Where BotToken is a token you received from BotFather and TgChatId is id of the chat. You can also change time when billing lambda is triggered by overriding CronExpression parameter. By default, it is 18 PM UTC.