3manuek / maestro

Maestro HTTP load balancer for Golang

Maestro HTTP load balancer

Maestro is a fast HTTP load balancer.It uses [Go's SingleHostReverseProxy] (http://golang.org/pkg/net/http/httputil/#NewSingleHostReverseProxy) to takes an incoming request and sends it to another server.

Use

For instance, to send incoming requests on port 8080 to hosts 1.1.1.1 and 2.2.2.2:

package main

import (
	"maestro/balancer"
	"net/http"
	"net/url"
)

func main() {
	u1, _ := url.Parse("http://1.1.1.1:8080/")
	u2, _ := url.Parse("http://2.2.2.2:8080/")
	targets := []*url.URL{u1, u2}
	lb := balancer.NewLoadBalancer(targets)
	log.Fatal(http.ListenAndServe(":8080", lb))
}

You can also change the target hosts dinamically:

package main

import (
	"maestro/balancer"
	"net/http"
	"net/url"
)

u1, _ := url.Parse("http://1.1.1.1:8080/")
u2, _ := url.Parse("http://2.2.2.2:8080/")

targets := []*url.URL{u1, u2}

lb := balancer.NewLoadBalancer(targets)

go func() {
	// Adding and removing a new host dinamically every 6 seconds
	for {
		time.Sleep(6 * time.Second)
		u, _ := url.Parse("http://3.3.3.3:8080/")
		lb.AddTarget(u)
		time.Sleep(6 * time.Second)
		lb.RemoveTarget(u)
	}
}()

log.Fatal(http.ListenAndServe(":8080", lb))