libra is a dynamic reverse proxy / load balancer

English document， 中文文档

Feature

• dynamic and multiple reverse proxy server
• dynamic change origin server addr
• dynamic change response header
• rigorous unit testing

You can use this package build a dynamic reverse proxy server faster, now it has three load balance algorithms, random, roundrobin, wroundrobin (round robin with weight)

Getting Started

Installation

To install this package, you need to install Go and setup your Go workspace on your computer. The simplest way to install the library is to run:

go get github.com/zhuCheer/libra

run example

Change directory to libra package and run the example.go, you can start a reverse proxy.

> cd ../src/github.com/zhuCheer/libra/example
> go run example.go

Now,you can open browser to http://127.0.0.1:5000,you will see the reverse proxy, it running with round robin balance to http://127.0.0.1:5001, http://127.0.0.1:5002 and http://127.0.0.1:5003 http server.

How to use

import "github.com/zhuCheer/libra"

    
// create a new reverse proxy，input three params bind ip:port, custom response header;
// then register a site, fill in domain name, balancer algorithm and origin url scheme;
// it has three balancer algorithm random，roundrobin，wroundrobin(round robin with weight)
var srv = libra.NewHttpProxySrv("127.0.0.1:5000", nil)
srv.RegistSite("www.yourappdomain.com", "roundrobin", "http")

// add target domain and ip:port
srv.AddAddr("www.yourappdomain.com", "127.0.0.1:5001", 1)
srv.AddAddr("www.yourappdomain.com", "127.0.0.1:5001", 2)


// start reverse proxy server
srv.Start()

Principles

• The reverse proxy serves as a gateway between users and your application origin server. In so doing it handles all policy management and traffic routing;
• A reverse proxy operates by:
• 1. Receiving a user connection request
• 2. Completing a TCP three-way handshake, terminating the initial connection
• 3. Connecting with the origin server and forwarding the original request

Functions

import "github.com/zhuCheer/libra"
var srv = libra.NewHttpProxySrv("127.0.0.1:5000", nil)
srv.RegistSite("www.yourappdomain.com", "roundrobin", "http")


// set response header
srv.ResetCustomHeader(map[string]string{"X-LIBRA": "the smart ReverseProxy"})

// change balance algorithm
srv.ChangeLoadType("www.yourappdomain.com", "random")


// add origin server addr, dynamic change without restarting
srv.AddAddr("www.yourappdomain.com","192.168.1.100:8081", 1)

// delete origin server addr, dynamic change without restarting
srv.DelAddr("www.yourappdomain.com","192.168.1.100:8081")

Contributors

• @Chase

License

MIT