GO_REUSEPORT
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() {
listener, err := reuseport.Listen("tcp", "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.