zookeeper/http.go

package main

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

	"go.wit.com/lib/protobuf/zoopb"
	"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)

	hostname := r.URL.Query().Get("hostname")

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

	if route == "/" {
		return
	}

	if route == "/machine" {
		var m *zoopb.Machine
		m = new(zoopb.Machine)
		if err := m.Unmarshal(msg); err != nil {
			log.Info("proto.Unmarshal() failed on wire message len", len(msg))
			log.Info("error =", err)
			return
		}
		log.Info("proto.Unmarshal() worked on wire message len", len(msg), "from", m.Hostname)
		switch updateMachine(m) {
		case "upgrade":
			fmt.Fprintln(w, "upgrade")
		default:
			fmt.Fprintln(w, "notsure")
		}
		return
	}

	if route == "/status" {
		if hostname == "" {
			// ignore junk
			log.Info("hostname was blank")
			return
		}
		var packs *zoopb.Packages
		packs = new(zoopb.Packages)
		if err := packs.Unmarshal(msg); err != nil {
			log.Info("proto.Unmarshal() failed on wire message len", len(msg), "from", hostname)
			return
		}

		log.Info("Unmarshal worked with msg len", len(msg), "from", hostname)
		log.Info(hostname, "has", packs.Len(), "packages installed")
		fmt.Fprintln(w, "upgrade")
		return
	}

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

// 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)
	}
}