Record requests and display results, in memory

mailhook.go

package main

import (
	"fmt"
	"net/http"
	"os"
	"strings"
)

//History of recent posts
type History struct {
	Recent []string
}

/*
Appends a message to history */
func (h *History) Append(msg string) {
	h.Recent = append(h.Recent, msg)
}

//Displays recent elements
func (h *History) WebList() string {
	return strings.Join(h.Recent, "\n---------\n")
}

func (h *History) Record(w http.ResponseWriter, r *http.Request) {
	msg := r.FormValue("mandrill_events")
	h.Append(msg)
	fmt.Fprint(w, "ok")
}

func (h *History) Index(w http.ResponseWriter, r *http.Request) {
	fmt.Fprint(w, h.WebList())
	if len(h.Recent) == 0 {
		fmt.Fprint(w, "Empty so far")
	}
}

func envOrDef(envVar, def string) string {
	if val := os.Getenv(envVar); len(val) > 0 {
		return val
	}
	return def
}

var (
	port = ":" + envOrDef("PORT", "8211")
)

func main() {
	hist := History{}
	http.HandleFunc("/", hist.Index)
	http.HandleFunc("/record", hist.Record)
	http.ListenAndServe(port, nil)
}