ugly but limping along progress

Signed-off-by: Jeff Carr <jcarr@wit.com>

README

@@ -16,8 +16,9 @@ Notes & Goals:
 
 * Be super easy to use.
 * Automatically map access to serial and graphical consoles
+* This is intended for managing Virtual Machines, not for containers
 * This often uses the DO nomenclature 'droplets' instead of 'virtual machines' or 'domU'
-* When possible, use protobuf over the wire
+* When possible, use protobuf
 * Let security be handled externally at the socket layer with other tools
 * Put network, cpu, etc stats in external tools
 * Automatic live migration to decommission nodes

event.go

@@ -0,0 +1,9 @@
+package main
+
+import (
+	"go.wit.com/log"
+)
+
+func (d *DropletT) Start() {
+	log.Info("a new virtual machine is running")
+}

http.go

@@ -5,7 +5,6 @@ import (
 	"net/http"
 	"strings"
 
-	"go.wit.com/lib/gui/shell"
 	"go.wit.com/log"
 )
 
@@ -30,24 +29,8 @@ func okHandler(w http.ResponseWriter, r *http.Request) {
 	}
 
 	if tmp == "/vms" {
-		for _, hostname := range argv.Hosts {
-			url := "http://" + hostname + ":2520/vms"
-			log.Info("wget url =", url)
-			s := shell.Wget(url)
-			if s == nil {
-				continue;
-			}
-			var bytesSplice []byte
-			bytesSplice = s.Bytes()
-			// fmt.Fprintln(w, string(bytesSplice))
-			for _, line := range strings.Split(string(bytesSplice), "\n") {
-				if line == "" {
-					continue
-				}
-				fmt.Fprintln(w, hostname, line)
-				log.Info("LINE: =", hostname, line)
-			}
-			// log.Info("i, s =", hostname, i, s)
+		for _, d := range me.droplets {
+			fmt.Fprintln(w, d.Hostname, d.hname, d.lastpoll)
 		}
 		return
 	}

main.go

@@ -3,9 +3,9 @@
 package main
 
 import (
-	//	"log"
 	"embed"
 	"os"
+	"time"
 
 	"go.wit.com/dev/alexflint/arg"
 	"go.wit.com/log"
@@ -19,15 +19,35 @@ var resources embed.FS
 func main() {
 	pp := arg.MustParse(&argv)
 
-	if ! argv.Uptime {
+	if !argv.Uptime {
 		pp.WriteHelp(os.Stdout)
 		os.Exit(0)
 	}
 
 	log.Info("connect to cluser here", argv.Hosts)
-	for i, s := range argv.Hosts {
-		log.Info("i, s =", i, s)
+	for _, s := range argv.Hosts {
+		me.names = append(me.names, s)
+
+		log.Info("Make a hypervisor struct for", s)
+		var h HyperT
+		h.Hostname = s
+		h.Autoscan = true
+		h.Delay = 3 * time.Second
+		h.Scan = func() {
+			log.Info("scanned farm03?")
+			h.pollHypervisor()
+		}
+		me.hypers = append(me.hypers, h)
+	}
+	go startHTTP()
+
+	log.Info("me.names =", me.names)
+	for _, h := range me.hypers {
+		log.Info("me hostname =", h.Hostname)
+		if h.Hostname == "farm03" {
+			log.Info("should start watchdog here for hostname =", h.Hostname)
+			h.NewWatchdog()
+		}
 	}
 
-	startHTTP()
 }

poll.go

@@ -0,0 +1,57 @@
+package main
+
+import (
+	"strings"
+	"time"
+
+	"go.wit.com/lib/gui/shell"
+	"go.wit.com/log"
+)
+
+func (h HyperT) pollHypervisor() {
+	url := "http://" + h.Hostname + ":2520/vms"
+	log.Info("wget url =", url)
+	s := shell.Wget(url)
+	if s == nil {
+		return
+	}
+	var bytesSplice []byte
+	bytesSplice = s.Bytes()
+	// fmt.Fprintln(w, string(bytesSplice))
+	for _, line := range strings.Split(string(bytesSplice), "\n") {
+		if line == "" {
+			continue
+		}
+		fields := strings.Fields(line)
+		if len(fields) < 2 {
+			continue
+		}
+		state := fields[0]
+		name := fields[1]
+		if state == "ON" {
+			log.Info("POLL", h.Hostname, "STATE:", state, "HOST:", name, "rest:", fields[2:])
+			var found = false
+			for _, d := range me.droplets {
+				if d.Hostname == name {
+					log.Info("ALREADY RECORDED", d.Hostname)
+					found = true
+					d.lastpoll = time.Now()
+					if d.hname != h.Hostname {
+						log.Info("DROPLET", d.Hostname, "MOVED FROM", d.hname, "TO", d.Hostname)
+					}
+
+					d.hname = h.Hostname
+				}
+			}
+			if found {
+				continue
+			}
+			var d DropletT
+			d.Hostname = name
+			d.hname = h.Hostname
+			me.droplets = append(me.droplets, d)
+			log.Info(name, "IS NEW. ADDED ON", h.Hostname)
+		}
+	}
+	// log.Info("i, s =", hostname, i, s)
+}

structs.go

@@ -0,0 +1,39 @@
+package main
+
+import "time"
+
+var me virtigoT
+
+// disable the GUI
+func (b *virtigoT) Disable() {
+	// b.mainbox.Disable()
+}
+
+// enable the GUI
+func (b *virtigoT) Enable() {
+	// b.mainbox.Enable()
+}
+
+// this app's variables
+type virtigoT struct {
+	names    []string
+	hypers   []HyperT
+	droplets []DropletT
+}
+
+// the stuff that is needed for a hypervisor
+type HyperT struct {
+	Hostname string        // the hypervisor hostname
+	Scan     func()        // the function to run to scan the hypervisor
+	Autoscan bool          // to scan or not to scan
+	Delay    time.Duration // how often to poll the hypervisor
+	Dog      *time.Ticker  // the watchdog timer itself
+}
+
+// the stuff that is needed for a hypervisor
+type DropletT struct {
+	Hostname string    // the name of the virtual machine. should be unique (probably enforce this forever)
+	hname    string    // the hypervisor it's currently running on
+	h        *HyperT   // the hypervisor it's currently running on
+	lastpoll time.Time // the last time the droplet was seen running
+}

watchdog.go

@@ -0,0 +1,64 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"time"
+
+	"go.wit.com/log"
+)
+
+// scan hypervisors every i seconds
+func (h *HyperT) NewWatchdog() {
+	var delay int = 99
+	var i int = delay
+	h.MyTicker(h.Delay, "new Watchdog() "+h.Hostname, func() {
+		i += 1
+		// check if the env var is set to autoscan
+		if os.Getenv("WATCHDOG_AUTO_SCAN") != "true" {
+			if i < delay {
+				i = delay
+			}
+			// print every 'delay' seconds
+			if i%delay == 0 {
+				log.Info("Not auto scanning", i, "WATCHDOG_AUTO_SCAN =", os.Getenv("WATCHDOG_AUTO_SCAN"))
+			}
+			return
+		}
+		if i < delay {
+			return
+		}
+		i = 0
+	})
+}
+
+// timeFunction takes a function as an argument and returns the execution time.
+func TimeFunction(f func()) time.Duration {
+	startTime := time.Now()      // Record the start time
+	f()                          // Execute the function
+	return time.Since(startTime) // Calculate the elapsed time
+}
+
+func (h *HyperT) MyTicker(t time.Duration, name string, f func()) {
+	h.Dog = time.NewTicker(t)
+	defer h.Dog.Stop()
+	done := make(chan bool)
+	/*
+		// this example would exit/destroy the ticker in 10 seconds
+		go func() {
+			time.Sleep(10 * time.Second)
+			done <- true
+		}()
+	*/
+	for {
+		select {
+		case <-done:
+			fmt.Println("Done!")
+			return
+		case t := <-h.Dog.C:
+			log.Info(name, "Current time: ", t)
+			h.Scan()
+			// f()
+		}
+	}
+}