virtigo/http.go

package main

import (
	"fmt"
	"math/rand"
	"net/http"
	"strings"
	"time"

	"go.wit.com/lib/gui/shell"
	"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) {
	var tmp string
	tmp = cleanURL(r.URL.Path)

	// list all the droplets
	if tmp == "/droplets" {
		log.Info("Handling URL:", tmp)
		for _, d := range me.droplets {
			dur := time.Since(d.lastpoll) // Calculate the elapsed time
			fmt.Fprintln(w, d.Hostname, d.hname, shell.FormatDuration(dur))
		}
		return
	}

	// is the cluster running what it should?
	if tmp == "/droplets" {
		for _, d := range me.droplets {
			if d.State != "ON" {
				continue
			}
			dur := time.Since(d.lastpoll) // Calculate the elapsed time
			if d.CurrentState != "ON" {
				fmt.Fprintln(w, "BAD  STATE   ", d.Hostname, "State =", d.State, "CurrentState =", d.CurrentState, shell.FormatDuration(dur))
			} else {
				dur := time.Since(d.lastpoll) // Calculate the elapsed time
				fmt.Fprintln(w, "GOOD STATE ON", d.Hostname, d.hname, shell.FormatDuration(dur))
			}
		}
		return
	}

	if tmp == "/favicon.ico" {
		writeFile(w, "ipv6.png")
		return
	}
	if tmp == "/uptime" {
		b, s := clusterHealthy()
		if b {
			log.Info("Handling URL:", tmp, "cluster is ok", s)
			fmt.Fprintln(w, s)
		} else {
			log.Info("Handling URL:", tmp, "cluster is not right yet", s)
			fmt.Fprintln(w, s)
		}
		for _, h := range me.hypers {
			url := "http://" + h.Hostname + ":2520/kill"
			dur := time.Since(h.lastpoll) // Calculate the elapsed time
			if dur > 90*time.Second {
				h.RestartDaemon()
				continue
			}
			if h.killcount != 0 {
				log.Info("KILL count =", h.killcount, "FOR", h.Hostname, dur, "curl", url)
			}
			if h.killcount > 10 {
				log.Info("KILL count is greater than 10 for host", h.Hostname, dur, "curl", url)
			}
			// l :=  shell.FormatDuration(dur)
			// log.Warn("HOST =", h.Hostname, "Last poll =", l)
			//if d.State != "ON" {
			//	continue
			//}
			// dur := time.Since(d.lastpoll) // Calculate the elapsed time
		}
		return
	}

	if tmp == "/start" {
		start := r.URL.Query().Get("start")
		log.Info("Handling URL:", tmp, "start droplet", start)
		dur := time.Since(me.unstable) // how long has the cluster been stable?

		fmt.Fprintln(w, "should start droplet here", start, shell.FormatDuration(dur))
		if dur < 17*time.Second {
			fmt.Fprintln(w, "grid is still to unstable")
			return
		}
		d := findDroplet(start)
		if d == nil {
			fmt.Fprintln(w, "can't start unknown droplet", start)
			return
		}

		// make the list of hypervisors that are active and can start new droplets
		var pool []*HyperT
		for _, h := range me.hypers {
			fmt.Fprintln(w, "could start droplet on", start, "on", h.Hostname, h.Active)
			if d.hyperPreferred == h.Hostname {
				// the config file says this droplet should run on this hypervisor
				h.Start(d)
				return
			}
			if h.Active != true {
				continue
			}
			pool = append(pool, h)
		}

		// left here as an example of how to actually do random numbers
		// it's complete mathematical chaos. Randomness is simple when
		// human interaction occurs -- which is exactly what happens most
		// of the time. most random shit is bullshit. all you really need
		// is exactly this to make sure the random functions work as they
		// should. Probably, just use this everywhere in all cases. --jcarr
		rand.Seed(time.Now().UnixNano())
		a := 0
		b := len(pool)
		n := a + rand.Intn(b-a)
		fmt.Fprintln(w, "pool has", len(pool), "members", "rand =", n)
		h := pool[n]
		h.Start(d)
		return
	}

	log.Warn("BAD URL =", tmp)
	fmt.Fprintln(w, "BAD ZOOT")
	// badurl(w, r.URL.String())
	// fmt.Fprintln(w, "BAD", tmp)
}

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)
	}
}