github.com/ma6174/go_reuseport

Brings SO_REUSEPORT into your Go server


Install
go get github.com/ma6174/go_reuseport

Documentation

GO_REUSEPORT

Build Status GoDoc

GO_REUSEPORT is a little expirement to create a net.Listener that supports SO_REUSEPORT socket option.

For now, Darwin and Linux (from 3.9) systems are supported. I'll be pleased if you'll test other systems and tell me the results. documentation on godoc.org.

Example

package main

import (
  "fmt"
  "html"
  "net/http"
  "os"
  "runtime"
  "github.com/kavu/go_reuseport"
)

func main() {
  runtime.GOMAXPROCS(runtime.NumCPU())

  listener, err := reuseport.NewReusablePortListener("tcp4", "localhost:8881")
  if err != nil {
    panic(err)
  }
  defer listener.Close()

  server := &http.Server{}
  http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
    fmt.Println(os.Getgid())
    fmt.Fprintf(w, "Hello, %q\n", html.EscapeString(r.URL.Path))
  })

  panic(server.Serve(listener))
}

Now you can run several instances of this tiny server without Address already in use errors.

Thanks

Inspired by Artur Siekielski post about SO_REUSEPORT.