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")
	flag := r.URL.Query().Get("flag")
	packname := r.URL.Query().Get("package")
	version := r.URL.Query().Get("version")

	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.Log(INFO, "proto.Unmarshal() worked on wire message len", len(msg), "from", m.Hostname)
		b := me.upgrade[m.Hostname]
		switch updateMachine(m) {
		case "upgrade":
			if b {
				fmt.Fprintln(w, "apt update")
				me.upgrade[m.Hostname] = false
			} else {
				fmt.Fprintln(w, "upgrade")
			}
		default:
			fmt.Fprintln(w, "notsure")
		}
		return
	}

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

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

	// list out the machines and thier version of zood
	if route == "/list" {
		log.HttpMode(w)
		defer log.HttpMode(nil)
		loop := me.machines.SortByHostname()
		for loop.Scan() {
			m := loop.Next()
			zood := m.Packages.FindByName("zood")
			v := me.targets["zood"] // this is the target version
			if zood == nil {
				log.Info("machine", m.Hostname, "does not have zood installed")
			} else {
				log.Info("zood version", zood.Version, "vs target version", v, "on machine", m.Hostname)
			}
		}
		return
	}

	// save the config file
	if route == "/save" {
		log.HttpMode(w)
		defer log.HttpMode(nil)
		if err := me.machines.ConfigSave(); err == nil {
			log.Log(NOW, "ConfigSave() ok")
		} else {
			log.Log(NOW, "ConfigSave() failed", err)
		}
		return
	}

	// flag a package to attempt to upgrade
	if route == "/upgrade" {
		log.HttpMode(w)
		defer log.HttpMode(nil)
		me.upgrade[hostname] = true
		log.Log(NOW, "setting package ", packname, " to upgrade")
		return
	}

	// set the target version for a package
	if route == "/target" {
		log.HttpMode(w)
		defer log.HttpMode(nil)
		me.targets[packname] = version
		log.Log(NOW, "setting package/version to ", packname, " ", version)
		return
	}

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