status.go

package main

import (
	"encoding/json"
	"net/http"
	"os"
	"runtime"
	"time"
)

var COMMIT string
var LASTMOD string

type Status struct {
	Success   bool   `json:"success"`
	Message   string `json:"message"`
	Timestamp string `json:"timestamp"`
	Commit    string `json:"commit"`
	LastMod   string `json:"lastmod"`
	Tech      string `json:"tech"`
	Version   string `json:"version"`
	Getwd     string `json:"os.Getwd()"`
	Hostname  string `json:"os.Hostname()"`
	Seconds   int64  `json:"os.Time.Now().Unix()"`
	TempDir   string `json:"os.TempDir()"`
}

func (status *Status) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	var err error

	status.Success = true
	status.Message = "OK"
	status.Timestamp = time.Now().UTC().Format(time.RFC3339)
	status.Commit = COMMIT
	status.LastMod = LASTMOD
	status.Tech = runtime.Version()

	status.Getwd, err = os.Getwd()
	if err != nil {
		status.Getwd = "ERROR: " + err.Error()
	}

	status.Hostname, err = os.Hostname()
	if err != nil {
		status.Hostname = "ERROR: " + err.Error()
	}

	status.Seconds = time.Now().Unix()
	status.TempDir = os.TempDir()
	status.Version = runtime.Version()

	callback := r.FormValue("callback")

	w.Header().Set("Content-Type", "text/plain; charset=utf8")
	w.Header().Set("Access-Control-Allow-Origin", "*")
	w.Header().Set("Access-Control-Allow-Methods", "POST, GET")
	w.Header().Set("Access-Control-Max-Age", "604800") // 1 week

	var b []byte
	b, err = json.Marshal(status)
	if err != nil {
		//LATER: log
		b = []byte("{\"success\":false,\"err\":\"json.Marshal failed\"}")
	}

	if callback > "" {
		w.Write([]byte(callback))
		w.Write([]byte("("))
		w.Write(b)
		w.Write([]byte(");"))
	} else {
		w.Write(b)
	}
}