package main

import (
	"flag"
	"io"
	"log"
	"net/http"
	"os"
)

type FileSender struct {
	path string
}

func (s *FileSender) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	f, err := os.Open(s.path)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
	defer f.Close()

	w.Header().Set("Content-Type", "text/plain")
	if _, err := io.Copy(w, f); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}
}

func main() {
	address := flag.String("address", ":8080", "Address to bind")
	web := flag.String("web", "web", "Web directory")

	http.Handle("/proc/stat", &FileSender{"/proc/stat"})
	http.Handle("/proc/meminfo", &FileSender{"/proc/meminfo"})
	http.Handle("/", http.FileServer(http.Dir(*web)))

	log.Println("Listening on", *address)
	http.ListenAndServe(*address, http.DefaultServeMux)
}