Event Delivery System

This is a simple event delivery system implemented using Node.js, Express, and Redis. The system receives events from an HTTP endpoint, queues them for delivery, and processes the events using retry mechanisms with exponential backoff.

Getting Started

Follow the steps below to set up and run the event delivery system on your local machine.

Prerequisites

• Node.js (14 or later)
• Docker (optional, for containerized deployment)

Installation

1. Clone the repository:

   git clone https://github.com/your-username/event-delivery-system.git
   cd event-delivery-system

2. Install dependencies:

   npm install
   

Usage

1. Start the Node.js server:

   npm start
   
   The server will start on port 3000 by default.
   

2. To receive and queue events:

   Send a POST request with an event payload to http://localhost:3000/api/events. Replace { "userID": "123", "payload": "Event data" } with your event data.

   curl -X POST -H "Content-Type: application/json" -d '{ "userID": "123", "payload": "Event data" }' http://localhost:3000/api/events
   

3. To process events with retries and backoff:

   Send a GET request to http://localhost:3000/api/process-events.

   curl http://localhost:3000/api/process-events
   
   The system will simulate delivery attempts with exponential backoff for failed events.
   

Docker (Optional)

You can also run the system using Docker for containerized deployment.

1. Build the Docker image:

```bash
docker build -t event-delivery-system .
```

2. Run a Docker container:

```bash
docker run -p 3000:3000 event-delivery-system
```