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|
package decor
import (
"fmt"
"io"
"math"
"time"
"github.com/VividCortex/ewma"
)
// SpeedFormatter is wrapper for SizeB1024 and SizeB1000 to format value as speed/s.
type SpeedFormatter struct {
fmt.Formatter
}
func (self *SpeedFormatter) Format(st fmt.State, verb rune) {
self.Formatter.Format(st, verb)
io.WriteString(st, "/s")
}
// EwmaSpeed exponential-weighted-moving-average based speed decorator.
// Note that it's necessary to supply bar.Incr* methods with incremental
// work duration as second argument, in order for this decorator to
// work correctly. This decorator is a wrapper of MovingAverageSpeed.
func EwmaSpeed(unit int, format string, age float64, wcc ...WC) Decorator {
var average MovingAverage
if age == 0 {
average = ewma.NewMovingAverage()
} else {
average = ewma.NewMovingAverage(age)
}
return MovingAverageSpeed(unit, format, average, wcc...)
}
// MovingAverageSpeed decorator relies on MovingAverage implementation
// to calculate its average.
//
// `unit` one of [0|UnitKiB|UnitKB] zero for no unit
//
// `format` printf compatible verb for value, like "%f" or "%d"
//
// `average` MovingAverage implementation
//
// `wcc` optional WC config
//
// format examples:
//
// unit=UnitKiB, format="%.1f" output: "1.0MiB/s"
// unit=UnitKiB, format="% .1f" output: "1.0 MiB/s"
// unit=UnitKB, format="%.1f" output: "1.0MB/s"
// unit=UnitKB, format="% .1f" output: "1.0 MB/s"
//
func MovingAverageSpeed(unit int, format string, average MovingAverage, wcc ...WC) Decorator {
var wc WC
for _, widthConf := range wcc {
wc = widthConf
}
if format == "" {
format = "%.0f"
}
d := &movingAverageSpeed{
WC: wc.Init(),
average: average,
producer: chooseSpeedProducer(unit, format),
}
return d
}
type movingAverageSpeed struct {
WC
producer func(float64) string
average ewma.MovingAverage
msg string
}
func (d *movingAverageSpeed) Decor(st *Statistics) string {
if !st.Completed {
var speed float64
if v := d.average.Value(); v > 0 {
speed = 1 / v
}
d.msg = d.producer(speed * 1e9)
}
return d.FormatMsg(d.msg)
}
func (d *movingAverageSpeed) NextAmount(n int64, wdd ...time.Duration) {
var workDuration time.Duration
for _, wd := range wdd {
workDuration = wd
}
durPerByte := float64(workDuration) / float64(n)
if math.IsInf(durPerByte, 0) || math.IsNaN(durPerByte) {
return
}
d.average.Add(durPerByte)
}
// AverageSpeed decorator with dynamic unit measure adjustment. It's
// a wrapper of NewAverageSpeed.
func AverageSpeed(unit int, format string, wcc ...WC) Decorator {
return NewAverageSpeed(unit, format, time.Now(), wcc...)
}
// NewAverageSpeed decorator with dynamic unit measure adjustment and
// user provided start time.
//
// `unit` one of [0|UnitKiB|UnitKB] zero for no unit
//
// `format` printf compatible verb for value, like "%f" or "%d"
//
// `startTime` start time
//
// `wcc` optional WC config
//
// format examples:
//
// unit=UnitKiB, format="%.1f" output: "1.0MiB/s"
// unit=UnitKiB, format="% .1f" output: "1.0 MiB/s"
// unit=UnitKB, format="%.1f" output: "1.0MB/s"
// unit=UnitKB, format="% .1f" output: "1.0 MB/s"
//
func NewAverageSpeed(unit int, format string, startTime time.Time, wcc ...WC) Decorator {
var wc WC
for _, widthConf := range wcc {
wc = widthConf
}
if format == "" {
format = "%.0f"
}
d := &averageSpeed{
WC: wc.Init(),
startTime: startTime,
producer: chooseSpeedProducer(unit, format),
}
return d
}
type averageSpeed struct {
WC
startTime time.Time
producer func(float64) string
msg string
}
func (d *averageSpeed) Decor(st *Statistics) string {
if !st.Completed {
speed := float64(st.Current) / float64(time.Since(d.startTime))
d.msg = d.producer(speed * 1e9)
}
return d.FormatMsg(d.msg)
}
func (d *averageSpeed) AverageAdjust(startTime time.Time) {
d.startTime = startTime
}
func chooseSpeedProducer(unit int, format string) func(float64) string {
switch unit {
case UnitKiB:
return func(speed float64) string {
return fmt.Sprintf(format, &SpeedFormatter{SizeB1024(math.Round(speed))})
}
case UnitKB:
return func(speed float64) string {
return fmt.Sprintf(format, &SpeedFormatter{SizeB1000(math.Round(speed))})
}
default:
return func(speed float64) string {
return fmt.Sprintf(format, speed)
}
}
}
|
