zood/http.go

package main

import (
	"fmt"
	"io/ioutil"
	"net/http"
	"os"
	"strings"

	"go.wit.com/log"
)

// remove '?' part and trailing '/'
func cleanURL(url string) string {
	url = "/" + strings.Trim(url, "/")
	return url
}

func okHandler(w http.ResponseWriter, r *http.Request) {
	log.Info("Got URL Path: ", r.URL.Path)
	route := cleanURL(r.URL.Path)

	domname := r.URL.Query().Get("domain")
	flag := r.URL.Query().Get("flag")

	msg, err := ioutil.ReadAll(r.Body) // Read the body as []byte
	if err != nil {
		fmt.Fprintln(w, "ReadAll() error =", err)
		return
	}

	log.Info("Got URL msg:", string(msg))
	if route == "/" {
		fmt.Fprintln(w, "OK")
		return
	}

	// exit the virtigo daemon & have systemd restart it
	// this can happen & when it does, access to
	// to libvirtd will hang (aka: virsh list will hang)
	// One way to trigger this is to not properly close
	// domain sockets opened from go-qemu/hypervisor
	// it's a good idea in any case so leave it here
	if route == "/kill" {
		log.Warn("KILLED")
		fmt.Fprintln(w, "KILLED")
		os.Exit(-1)
		return
	}

	// curl http://localhost:2520/import?domain=foo.bar.com
	if route == "/import" {
		fmt.Fprint(w, "import domain:", domname)

		return
	}

	// toggle logging flags
	if route == "/flag" {
		log.HttpMode(w)
		defer log.HttpMode(nil)
		log.Info("going to toggle flag:", flag)
		switch flag {
		case "PING":
			if PING.Bool() {
				log.Log(NOW, "toogle PING false")
				PING.SetBool(false)
			} else {
				log.Log(NOW, "toogle PING true")
				PING.SetBool(true)
			}
		default:
			log.Info("unknown looging flag:", flag)
		}
		return
	}

	if route == "/favicon.ico" {
		writeFile(w, "ipv6.png")
		return
	}

	log.Warn("BAD URL =", route)
}

func writeFile(w http.ResponseWriter, filename string) {
	// fmt.Fprintln(w, "GOT TEST?")
	fullname := "resources/" + filename
	pfile, err := resources.ReadFile(fullname)
	if err != nil {
		log.Println("ERROR:", err)
		// w.Write(pfile)
		return
	}

	var repohtml string
	repohtml = string(pfile)
	if filename == "goReference.svg" {
		w.Header().Set("Content-Type", "image/svg+xml")
	}
	fmt.Fprintln(w, repohtml)
	log.Println("writeFile() found internal file:", filename)
}

// starts and sits waiting for HTTP requests
func startHTTP() {
	http.HandleFunc("/", okHandler)

	p := fmt.Sprintf(":%d", argv.Port)
	log.Println("Running on port", p)

	err := http.ListenAndServe(p, nil)
	if err != nil {
		log.Println("Error starting server:", err)
	}
}