GoldVault

GoldVault is a backend service for a gold trading platform, allowing users to buy and sell assets like gold, manage their wallets, and view pricing information. The system is built using microservices with a focus on scalability, reliability, and performance.

Features

• User management with OTP-based authentication.
• Asset trading functionality with real-time price updates.
• Wallet service allowing users to manage multiple asset types.
• Separate microservices for handling users, assets, pricing, and trades.
• Configurable system flag for allowing purchases even when inventory is low.
• High scalability with gRPC, Redis, and PostgreSQL.
• Optimized caching with Redis for handling high traffic on asset price requests.

Architecture

GoldVault is built using a microservices architecture with the following key components:

• User-Service: Manages user profiles, OTP authentication, and roles.
• Wallet-Service: Manages user wallets, asset balances, and transaction histories.
• Asset-Service: Provides up-to-date asset prices and handles price caching.
• Trade-Service: Manages the trading system, including inventory management and transaction logging.

The project follows a hexagonal architecture to separate business logic from infrastructure concerns. It also supports dependency injection using Uber's fx library.

Technologies

• Golang: The primary programming language for backend services.
• PostgreSQL: Used for persistence.
• Redis: Used for caching asset prices and managing rate limits.
• gRPC: Used for communication between microservices.
• Docker: Containerizes the services for easy deployment.
• Uber Fx: Dependency injection framework for Go.
• Swagger: API documentation for the services.

Folder Structure

.
├── cmd
│   ├── app
│   └── clients
├── internal
│   ├── config
│   ├── core
│   │   ├── application
│   │   │   └── services
│   │   └── domain
│   │       └── entities
│   ├── infrastructure
│   │       ├── db
│   │       │    └── migrations
│   │       ├── cache
│   │       └── persistence   
│   ├── interfaces
│   │   ├── api
│   │   └── dto
│   └── server
└── proto

Contributing

If you'd like to contribute to the project, feel free to open a pull request or raise an issue.

License

This project is licensed under the MIT License.