Overview

The notification-scheduler is a lambda-function that is invoked using a cloud-watch schedule that triggers every 1 minute.

• All notifications created by the clients are stored in the PostgreSQL notifications-database by the event-service with all the information required to send the notification to the client.
• When the notification-scheduler is invoked it retrieves the notification from the notification-database that are to be delivered in the next minute and forward them to the notification-sns-topic as notificaton-messages.
• The notification-sqs-queue subscribed to the notification-sns-topic recieves the notification-message as soon as it is published to the sns-topic.
• The notification-service continuously polls the notification-sqs-queue and send the incoming notification to the clients.

Operating Instructions

Fork

• Fork this repository
  • "Forking" adds a copy of adisakshya/custom-scheduler repository to your GitHub account as https://github.com/YourGitHubUserName/custom-scheduler
• Or you can download or clone this repository
  • You can clone the repository executing below command in a location of your choice in your system
  • $ git clone https://github.com/adisakshya/custom-scheduler.git
• Source code for the custom-scheduler can be found at /src
• Serverless configuration is defined at /src/serverless.yml

Local Development

Prerequisites

• Make sure you have
  • Installed the severless framework
  • PostgreSQL notification-database running and is accessible using host-url, username and password
  • AWS SNS notification-topic setup and is accessible using ARN

Starting the scheduler

• In source directory src/ run the following command
  • $ yarn install - install required dependencies
  • $ yarn build - build source code
  • $ yarn test - run test (optional)
  • $ yarn start - start the scheduler
• On successful start, the scheduler will be invoked every 1 minute and will start forwarding the notifications in the notification-database to the notification-sns-topic.

Contributing

There are multiple ways to contribute to this project, read about them here.

License

All versions of the app are open-sourced, read more about this LICENSE.