main.go

package main

import (
	"fmt"
	"net"
	"net/http"
	"os"
	"os/signal"
	"path/filepath"
	"syscall"

	"github.com/apex/log"
	"github.com/oklog/run"
)

const addr string = ":3000"

func main() {
	log.SetLevel(log.DebugLevel)
	var g run.Group

	fs := http.FileServer(http.Dir(filepath.Dir(os.Args[0])))

	{
		ln, err := net.Listen("tcp", addr)
		if err != nil {
			panic(err)
		}
		log.WithField("address", addr).Info("listening...")
		g.Add(func() error {
			if err := http.Serve(ln, fs); err != nil {
				return err
			}
			return nil
		}, func(error) {
			ln.Close()
			log.Warn("stopped listening")
		})
	}

	{
		g.Add(func() error {
			var sigchan = make(chan os.Signal)
			signal.Notify(sigchan, syscall.SIGTERM, syscall.SIGHUP, syscall.SIGINT)
			for {
				select {
				case s := <-sigchan:
					return fmt.Errorf("received signal %v", s)
				}
			}
		}, func(error) {})
	}

	err := g.Run()
	log.WithField("cause", err.Error()).Warn("shutting down...")
}