virtbuf/human.go

package virtbuf

// mostly just functions related to making STDOUT
// more readable by us humans

// also function shortcuts the do limited formatting (haha, who remembers COBOL?)
// so reporting tables of the status of what droplets and hypervisors
// are in text columns and rows that can be easily read in a terminal

import (
	"errors"
	"fmt"
	"net/http"
	"strings"
	"time"

	"go.wit.com/log"
)

func oldGetDurationStamp(t time.Time) string {
	// Get the current time
	currentTime := time.Now()

	// Calculate the duration between t current time
	duration := currentTime.Sub(t)

	return FormatDuration(duration)
}

// This isn't for the marketing department
// so this isn't going to use 'MiB' and 'GiB'
func HumanFormatBytes(b int64) string {
	if b < 2000 {
		return fmt.Sprintf("%d B", b)
	}

	kb := int(b / 1024)
	if kb < 2000 {
		return fmt.Sprintf("%d KB", kb)
	}

	mb := int(b / (1024 * 1024))
	if mb < 2000 {
		return fmt.Sprintf("%d MB", mb)
	}

	gb := int(b / (1024 * 1024 * 1024))
	if gb < 2000 {
		return fmt.Sprintf("%d GB", gb)
	}

	tb := int(b / (1024 * 1024 * 1024 * 1024))
	return fmt.Sprintf("%d TB", tb)
}

func FormatDuration(d time.Duration) string {
	result := ""

	// check if it's more than a year
	years := int(d.Hours()) / (24 * 365)
	if years > 0 {
		result += fmt.Sprintf("%dy", years)
		return result
	}

	// check if it's more than a day
	days := int(d.Hours()) / 24
	if days > 0 {
		result += fmt.Sprintf("%dd", days)
		return result
	}

	// check if it's more than an hour
	hours := int(d.Hours()) % 24
	if hours > 0 {
		result += fmt.Sprintf("%dh", hours)
		return result
	}

	// check if it's more than a minute
	minutes := int(d.Minutes()) % 60
	if minutes > 0 {
		result += fmt.Sprintf("%dm", minutes)
		return result
	}

	// check if it's more than a second
	seconds := int(d.Seconds()) % 60
	if seconds > 0 {
		result += fmt.Sprintf("%ds", seconds)
		return result
	}

	// report in milliseconds
	ms := int(d.Milliseconds())
	if ms > 100 {
		// todo: print .3s, etc ?
		return fmt.Sprintf("%1.2fs", seconds/1000)
	}
	if ms > 0 {
		result += fmt.Sprintf("%dms", ms)
	}

	// totally not necessary but wth
	var t time.Duration
	t = time.Duration(ms) * time.Millisecond
	nanos := d - t
	result += fmt.Sprintf("%dnanos", nanos)
	return result
}

func (d *Droplet) SprintHeader() string {
	if d.Current == nil {
		d.Current = new(Current)
	}
	header := fmt.Sprintf("%-3.3s %-9.9s %-20.20s", d.Current.State, d.Current.Hypervisor, d.Hostname)

	switch d.Current.State {
	case DropletState_ON:
		var dur string
		if d.Current.OnSince != nil {
			dur = ""
		} else {
			t := time.Since(d.Current.OnSince.AsTime()) // time since 'OFF'
			dur = FormatDuration(t)
		}
		header += fmt.Sprintf(" (on :%3s)", dur)
	case DropletState_OFF:
		var dur string
		if d.Current.OffSince != nil {
			dur = ""
		} else {
			t := time.Since(d.Current.OffSince.AsTime()) // time since 'OFF'
			dur = FormatDuration(t)
		}
		header += fmt.Sprintf(" (off:%3s)", dur)
	default:
		header += fmt.Sprintf(" (?? :%3s)", "")
	}
	return header
}

func (d *Droplet) SprintDumpHeader() string {
	var macs []string
	for _, n := range d.Networks {
		macs = append(macs, n.Mac)
	}

	// this line in golang could replace 80 lines of COBOL
	header := fmt.Sprintf("%-4.4s%20s %-8s", d.Current.State, strings.Join(macs, " "), d.Current.Hypervisor)

	if d.Current == nil {
		d.Current = new(Current)
	}

	switch d.Current.State {
	case DropletState_ON:
		var dur string
		if d.Current.OnSince != nil {
			dur = ""
		} else {
			t := time.Since(d.Current.OnSince.AsTime()) // time since 'ON'
			dur = FormatDuration(t)
		}
		header += fmt.Sprintf(" (on :%3s)", dur)
	case DropletState_OFF:
		var dur string
		if d.Current.OffSince != nil {
			dur = ""
		} else {
			t := time.Since(d.Current.OffSince.AsTime()) // time since 'OFF'
			dur = FormatDuration(t)
		}
		header += fmt.Sprintf(" (off:%3s)", dur)
	default:
		header += fmt.Sprintf(" (?? :%3s)", "")
	}
	return header
}

func (d *Droplet) DumpDroplet(w http.ResponseWriter, r *http.Request) (string, error) {
	if d == nil {
		reason := "DumpDroplet() got d == nil"
		log.Warn(reason)
		fmt.Fprintln(w, reason)
		return "", errors.New(reason)
	}
	t := d.FormatTEXT()
	log.Info(t)
	fmt.Fprintln(w, t)
	return t, nil
}

func (c *Cluster) DumpDroplet(w http.ResponseWriter, r *http.Request) (string, error) {
	hostname := r.URL.Query().Get("hostname")
	d := c.FindDropletByName(hostname)
	if d == nil {
		result := "can not find droplet hostname=" + hostname
		log.Info(result)
		fmt.Fprintln(w, result)
		return result, errors.New(result)
	}
	return d.DumpDroplet(w, r)
}