Newsletter Sign-Up Microservice and CLI

Overview

This project consists of a microservice (newsletter_service.py) and a command-line interface (CLI) program (newsletter_cli.py) that allows users to manage their subscription to a newsletter. Users can add or remove their email addresses from the newsletter list, which is stored in a text file for persistence.

Microservice: newsletter_service.py

Description

The newsletter_service.py microservice handles requests to add or remove email addresses from a newsletter subscription list. The service listens on a specified port and interacts with a text file that stores the list of subscribed email addresses.

Features

• Add Email: Users can add their email address to the subscription list.
• Remove Email: Users can remove their email address from the subscription list.
• Persistent Storage: The list of email addresses is stored in a text file to ensure data persistence across sessions.

Requirements

• Python 3.x
• ZeroMQ library (pyzmq)

Usage

1. Running the Microservice:

   • Ensure you have Python 3.x and the ZeroMQ library installed.
   • Run the microservice using the command: python newsletter_service.py.
   • The service will start listening on port 5556 for incoming requests.

2. Request Format:

   • The service expects a JSON object with the following format:

     {
       "action": "add" | "remove",
       "email": "[email protected]"
     }

   • The action field specifies whether the email should be added or removed from the list.
   • The email field contains the user's email address.

3. Response:

   • The service responds with a confirmation message indicating the success or failure of the action.

Example

{
  "action": "add",
  "email": "[email protected]"
}