virtigo/config.go

package main

/*
	All the information is defined by protobuf files

	The config files written out by default into
	~/.config/virtigo/

	protobuf definitions are by nature non-relational
	so each protobuf is written out as a seperate file.

	This seems like the simpilist way to handle this.
*/

import (
	"errors"
	"fmt"
	"os"
	"path/filepath"
	"time"

	pb "go.wit.com/lib/protobuf/virtbuf"
	"go.wit.com/log"
)

var ErrorNoFile error = errors.New("missing file")
var ErrorParseJSON error = errors.New("invalid json")
var ErrorParseXML error = errors.New("invalid xml")

// something is wrong somewhere and sometimes the
// protobuf json files get written out with garbage
func cfgfile() {
	err := readConfigFile("virtigo.json")
	if err == nil {
		return
	}
	if err == ErrorParseJSON {
		os.Exit(-1)
	}
	err = readConfigFile("virtigo.json.last")
	if err == nil {
		log.Info("read json failed", err)
		os.Exit(-1)
	}
	if err == ErrorNoFile {
		log.Info("no config file created yet", err)
		os.Exit(-1)
	}
}

func readConfigFile(filename string) error {
	me.cluster = new(pb.Cluster)
	fullname := filepath.Join(os.Getenv("VIRTIGO_HOME"), filename)
	pfile, err := os.ReadFile(fullname)
	if err != nil {
		log.Info("open config file :", err)
		return err
	}
	err = me.cluster.UnmarshalJSON(pfile)
	if err != nil {
		log.Info("read json failed", err)
		os.Exit(-1)
		return err
	}

	// initialize each hypervisor
	for _, pbh := range me.cluster.Hypervisors {
		h := findHypervisor(pbh.Hostname)
		if h != nil {
			continue
		}
		// this is a new unknown droplet (not in the config file)
		h = new(HyperT)
		h.pb = pbh

		h.lastpoll = time.Now()

		me.hypers = append(me.hypers, h)
		log.Log(EVENT, "config new hypervisors", h.pb.Hostname)
	}

	// initialize values for each droplet
	for _, pbd := range me.cluster.Droplets {
		d := findDroplet(pbd.Hostname)
		if d != nil {
			continue
		}
		// this is a new unknown droplet (not in the config file)
		d = new(DropletT)
		d.pb = pbd
		me.droplets = append(me.droplets, d)
		log.Log(EVENT, "config new droplet", d.pb.Hostname, d.pb.StartState, d.pb.PreferredHypervisor)
	}

	return nil
}

func writeConfigFile() {
	// Get the current time
	now := time.Now()

	// Format the time to match your desired format: YYYY.MM.DD.HHMMSS
	timestamp := now.Format("2006.01.02.150405")

	filename := "virtigo.json.new." + timestamp
	if !writeConfigFileTmp(filename) {
		log.Println("config file write error")
		os.Exit(-1)
	}

	origname := filepath.Join(os.Getenv("VIRTIGO_HOME"), "virtigo.json")
	newname := filepath.Join(os.Getenv("VIRTIGO_HOME"), "virtigo.json.old")
	err := os.Rename(origname, newname)
	if err != nil {
		log.Printf("rename fail: %s", err)
		os.Exit(-1)
	}

	if !writeConfigFileTmp("virtigo.json") {
		log.Println("config file write error")
		os.Exit(-1)
	}

	if me.events.WriteConfigJSON() {
		os.Exit(-1)
	}
	if me.events.WriteConfigTEXT() {
		os.Exit(-1)
	}

	/*
	if me.cluster.Droplets.WriteConfigJSON() {
		os.Exit(-1)
	}
	if me.cluster.Droplets.WriteConfigTEXT() {
		os.Exit(-1)
	}
	*/
}

func writeConfigFileTmp(filename string) bool {
	fullname := filepath.Join(os.Getenv("VIRTIGO_HOME"), filename)
	cfgfile, err := os.OpenFile(fullname, os.O_RDWR|os.O_CREATE, 0666)
	defer cfgfile.Close()
	if err != nil {
		log.Info("open config file :", err)
		return false
	}
	json := me.cluster.FormatJSON()
	fmt.Fprintln(cfgfile, json)
	log.Info("Write:", fullname, "OK")
	return true
}

func writeConfigFileDroplets() {
	fullname := filepath.Join(os.Getenv("VIRTIGO_HOME"), "droplets.text")
	cfgfile, err := os.OpenFile(fullname, os.O_RDWR|os.O_CREATE, 0666)
	defer cfgfile.Close()
	if err != nil {
		log.Info("open config file :", err)
		return
	}
	// text := me.cluster.Droplets.FormatTEXT()
	text := me.cluster.FormatTEXT()
	fmt.Fprintln(cfgfile, text)
	log.Info("Write:", fullname, "OK")
}