Circuit Breaker in Golang

This repository contains a simple implementation of the Circuit Breaker in Golang.

Overview

The Circuit Breaker pattern is used to protect a system from failures in its external dependencies. It helps to improve the system's resiliency by preventing cascading failures and allowing the system to recover gracefully when a dependency fails.

The Circuit Breaker implementation in this repository has three main states:

• Closed: The external dependency is considered healthy, and all requests are executed as expected.
• Open: The external dependency is considered unhealthy, and no requests are executed to prevent further failures.
• Half-Open: The external dependency is being tested for healthiness, and a limited number of requests are executed to determine if the dependency has recovered.

Installation

go get -u github.com/farzai/breaker-go

Usage

To use the Circuit Breaker, first import the breaker package:

import "breaker"

func main() {
    // Create a new Circuit Breaker instance with the desired failure threshold and reset timeout:
    cb := breaker.NewCircuitBreaker(3, 5*time.Second)

    // Wrap any function that communicates with an external dependency using the Execute method of the Circuit Breaker:
    result, err := cb.Execute(func() (interface{}, error) {
        // Code to interact with the external dependency
    })

    // Handle the result of the function call
}

Testing

Unit tests for the Circuit Breaker can be found in the breaker_test.go file. To run the tests, use the following command:

go test

License

This project is licensed under the MIT License - see the MIT license for details.