Create and start http server in go

main.go

package main

import (
  "github.com/pkg/errors"
  "github.com/gorilla/mux"
  "time"
  "net/http"
  "net"
  "log"
  "fmt"
  "os"
)

func NewRouter() (http.Handler) {
  r := mux.NewRouter()

  r.Path("/").
         Methods("GET").
         HandlerFunc(HTTPRoot())

  return r
}

func StartHTTPServer(addr *net.TCPAddr) (*http.Server, error) {
  server := &http.Server{
    WriteTimeout: 5 * time.Second,
    ReadTimeout: 5 * time.Second,
    Handler: NewRouter(),
  }

  l, err := net.ListenTCP(addr.Network(), addr)
  if err != nil {
    return nil, errors.Wrapf(err, "Error listening on address: %s", addr)
  }

  server.Addr = l.Addr().String()

  go func(server *http.Server, l net.Listener) {
    server.Serve(l)
  }(server, l)

  return server, nil
}

func HTTPRoot() (http.HandlerFunc) {
  v1 := HTTPRootV1()

  return func(w http.ResponseWriter, r *http.Request) {
    // Route the request to the right handler's version
    v1(w, r)
  }
}

func HTTPRootV1() (http.HandlerFunc) {
  return func(w http.ResponseWriter, r *http.Request) {
    w.Write([]byte("hello"))
  }
}

func main() {
  // ensure address is correct, remove hardcoded value here
  addr, err := net.ResolveTCPAddr("tcp", "127.0.0.1:12344")
  if err != nil {
    log.Fatal(err)
  }

  // you can pass more variables if you need to pass them to handlers
  server, err := StartHTTPServer(addr/*, users */)
  if err != nil {
    fmt.Fprintf(os.Stderr, err.Error())
    os.Exit(1)
  }

  log.Printf("HTTP Server listeing on: %s\n", server.Addr)

  select{}
}