Proxy Load Balancer

Overview

This project implements a load balancer using the Go programming language and the Gin web framework. It forwards incoming requests to a set of backend servers using a round-robin strategy, with health checks to ensure only healthy servers receive traffic. This implementation also includes query parameter tracking for each forwarded request.

---

How It Works

1. Proxies Setup:

   • Backend servers are defined in a list (targetServers).
   • Each server is wrapped in a Proxy object, which includes a reverse proxy and a health-checking mechanism.

2. Health Checks:

   • The HealthChecker runs in a separate goroutine, periodically checking the /health endpoint of each backend server.

3. Request Handling:

   • Incoming requests are routed to the next healthy backend server using a round-robin strategy.
   • A query parameter (reqCounter) is added to track requests.

4. Gin Web Framework:

   • The application is built on the Gin framework, allowing for efficient request handling and routing.

---

Installation and Usage

Prerequisites

• Go (>=1.16)
• Gin web framework (go get -u github.com/gin-gonic/gin)

Steps

1. Clone the repository:

   git clone <repository_url>

2. Navigate to the project directory:

   cd proxy-load-balancer

3. Run the application:

   go run main.go

4. Run the backend servers:

   go run backend/main.go 8080
   go run backend/main.go 8081
   go run backend/main.go 8082
   

5. Send curl command:

       curl http://localhost/ping
   

6. Test using ab

       ab -n 100000 -c 1 http://localhost/ping 
   

7. Test using wrk

       wrk -t1 -c5 -d60 http://localhost/ping
   

---

License

This project is licensed under the MIT License.

---

Acknowledgments

• Inspired the solution from Coding Challenges by John Crickett