main.go

package main

import (
	"fmt"
	"io"
	"log"
	"net/http"
	"os"
	"time"
)

var startup = time.Now()

func main() {
	http.HandleFunc("/healthz", health)
	http.HandleFunc("/", serve)
	log.Fatal(http.ListenAndServe(":8080", nil))
}

func serve(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintf(w, "since startup: %s\n", time.Now().Sub(startup))

	for _, e := range os.Environ() {
		fmt.Fprintln(w, e)
	}
}

func health(w http.ResponseWriter, r *http.Request) {
	if time.Now().After(startup.Add(30 * time.Second)) {
		io.WriteString(w, "ok")
		return
	}
	http.Error(w, "starting up", http.StatusServiceUnavailable)
}