🎧 Video to MP3 Converter – Microservices Application

A distributed, cloud-native microservices project that allows users to upload videos and receive their converted MP3s. Built using Docker, Kubernetes, Flask, RabbitMQ, GridFS, and MySQL, the system ensures asynchronous processing, secure authentication, and efficient delivery of audio files.

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🗺️ Architecture Overview

All services run in a Kubernetes cluster and communicate via RabbitMQ and REST APIs.

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⚙️ Tech Stack

Layer	Stack/Tool
API Framework	Flask
Authentication	JWT + MySQL
File Storage	MongoDB + GridFS
Queue	RabbitMQ (video & mp3 queues)
Notification	SMTP (e.g., Gmail/Mailtrap)
Containerization	Docker
Orchestration	Kubernetes via Minikube
Gateway	NGINX
DevOps	K9s (for pod monitoring)

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🚀 How It Works

1. The client uploads a video via the API Gateway.
2. The API Gateway forwards the request to the Auth Service, which:
   • Verifies the JWT token.
   • Checks credentials in the MySQL database.
   • Approves/rejects the request based on authentication result.
3. If authenticated, the API Gateway pushes the request to the video queue in RabbitMQ.
4. The Converter Service (consumer of the video queue):
   • Converts the video to MP3 using ffmpeg.
   • Uploads the MP3 to MongoDB using GridFS.
   • Extracts the MP3's ObjectID and pushes it to the mp3 queue.
5. The Notification Service (consumer of the mp3 queue):
   • Sends an email to the user containing the GridFS ObjectID.
6. The User takes this ObjectID and sends a GET request to the API Gateway.
   • The request is routed via NGINX.
   • The Gateway fetches the MP3 using the ObjectID from GridFS and returns it to the client.

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🧱 Microservices Overview

📌 API Gateway

• Entry point for all user requests.
• Routes traffic to internal services using NGINX.
• Delegates authentication to the auth-service.
• Pushes jobs to RabbitMQ queues.
• Handles video upload and MP3 download logic.

🔐 Auth Service

• Responsible for authentication and authorization.
• Verifies user tokens and credentials.
• Interacts with the MySQL database.
• Used by the API Gateway to validate users.

🎥 Converter Service

• Consumes jobs from the video queue.
• Converts video to MP3 using ffmpeg.
• Uploads MP3 to MongoDB (GridFS).
• Publishes a message to the mp3 queue with the MP3's ObjectID.

📧 Notification Service

• Consumes jobs from the mp3 queue.
• Sends an email containing the MP3's ObjectID.
• Email does not contain a direct download link, but an ID the user can use to fetch the MP3 later.

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🛠️ Setup & Deployment

🔃 Prerequisites

• Docker
• Minikube
• kubectl
• Python 3.9+
• ffmpeg installed locally
• SMTP credentials (Gmail or Mailtrap recommended)

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📦 Clone & Launch

git clone https://github.com/Abzaek/video_to_mp3.git
cd video_to_mp3

# Start Minikube
minikube start

# Deploy all services
cd <service-name>
kubectl apply -f manifests/

# Monitor pods
k9s