Distributed API Gateway with Go & gRPC

A distributed API Gateway built in Go. This system acts as a centralized entry point

Key Features

• gRPC Communication: Leverages gRPC binary protocol for ultra-fast communication between the Gateway and internal Auth services.
• Circuit Breaker Implementation: Prevents cascading failures using the gobreaker library, ensuring system stability when internal services are down.
• Distributed Rate Limiting: User-based traffic control using Redis with a fixed-window algorithm to prevent API abuse.
• Real-time Monitoring: A live observability dashboard powered by SSE (Server-Sent Events) to monitor traffic and system health without page refreshes.
• Multi-level Caching: Reduces latency by implementing a local in-memory cache for authentication data at the Gateway level.
• Atomic Metrics: High-performance, lock-free metrics recording using Go's sync/atomic package for minimal overhead under heavy load.

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Tech Stack

• Language: Go (1.21+)
• Communication: gRPC & Protocol Buffers
• Database: PostgreSQL (User Persistence)
• Cache & Rate Limiting: Redis
• Monitoring: HTML5, Chart.js, SSE
• Containerization: Docker & Docker Compose
• Logging: Uber Zap (Structured Logging)

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High-Level Architecture

Incoming requests are captured by the Gateway and passed through a chain of middleware (Logging, Metrics, Authentication, and Rate Limiting) before reaching the final destination.

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Quick Start

1. Prerequisites

Ensure you have Docker and Docker Compose installed on your machine.

2. Clone and Run

# Clone the repository
git clone https://github.com/mohammad-kh1/distributed-gateway.git
cd distributed-gateway

# Spin up all services in containers
docker-compose up --build