ExpenseTracker

A microservices-based, event-driven and event sourcing application for tracking financial transactions.

ExpenseTracker is built with modularity, scalability, and observability in mind. It enables users to create accounts, track income/expenses, and audit every transaction using Event Sourcing and Event-Driven Architecture.

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Table of Contents

• Features
• Technologies Used
• Installation
• Usage
• API Reference
• Tests
• Deployment
• Contributing
• License
• Contact and Acknowledgments

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Features

• 🧾 Account creation and lifecycle management
• 💸 Deposit and withdrawal tracking
• 📜 Event-sourced audit logs
• 🧠 Projections using Marten for read models
• 🚀 Asynchronous communication with RabbitMQ and Wolverine
• 🔒 Health checks and diagnostics endpoints
• 📦 Containerized using Docker Compose
• 🛡️ API Gateway via Kong

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Technologies Used

• Backend: .NET 8, C#
• Messaging: RabbitMQ, Wolverine
• Event Store & Projections: Marten (PostgreSQL)
• API Gateway: Kong
• Cache: Redis
• Infrastructure: Docker, Docker Compose
• Tests: xUnit, Testcontainers

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Installation

Prerequisites

• Docker + Docker Compose
• .NET 8 SDK
• Git

Steps

# Clone the repository
git clone https://github.com/aekoky/ExpenseTracker.git
cd ExpenseTracker

# Start the system
docker-compose up --build

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Usage

• Kong Gateway Proxy: http://localhost:8000
• AuditService Swagger: http://localhost:8000/audit/api/docs
• ExpenseService Swagger: http://localhost:8000/expense/api/docs

Health endpoints:

GET /health

Run services manually if needed:

dotnet run --project src/Services/ExpenseService
dotnet run --project src/Services/AuditService

API Reference

ExpenseService

• POST /expense/api/accounts
• PUT /expense/api/accounts/{id}/deposit
• PUT /expense/api/accounts/{id}/withdraw
• DELETE /expense/api/accounts/{id}

AuditService

• GET /audit/api/accounts
• GET /audit/api/accounts/{id}/events

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Tests

dotnet test

Test projects are located in /tests:

• ExpenseService.IntegrationTests
• ExpenseService.UnitTests
• AuditService.IntegrationTests
• AuditService.UnitTests

Uses Testcontainers for ephemeral PostgreSQL and RabbitMQ setup.

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Deployment

• Deploy via Docker Compose or Kubernetes
• Customize .env and docker-compose.override.yml for production settings
• Ensure external databases, queues, and cache systems are configured properly

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Contributing

We welcome contributions!

1. Fork the repo
2. Create your feature branch (git checkout -b feature/AmazingFeature)
3. Commit your changes (git commit -m 'Add AmazingFeature')
4. Push to the branch (git push origin feature/AmazingFeature)
5. Open a pull request

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License

This project is licensed under the MIT License.

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Contact and Acknowledgments

Developed by Reda AEKOKY

Special thanks to the open-source community and libraries like:

• JasperFx Ecosystem (Marten, Wolverine)
• Testcontainers
• Kong Gateway