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package main
import (
"context"
"fmt"
"math/rand"
"sync"
"time"
"github.com/vbauerster/mpb/v8"
"github.com/vbauerster/mpb/v8/decor"
)
func main() {
ctx, cancel := context.WithTimeout(context.Background(), 3*time.Second)
defer cancel()
var wg sync.WaitGroup
// passed wg will be accounted at p.Wait() call
p := mpb.NewWithContext(ctx, mpb.WithWaitGroup(&wg))
total := 300
numBars := 3
wg.Add(numBars)
for i := 0; i < numBars; i++ {
name := fmt.Sprintf("Bar#%02d: ", i)
bar := p.AddBar(int64(total),
mpb.PrependDecorators(
decor.Name(name, decor.WCSyncWidthR),
decor.EwmaETA(decor.ET_STYLE_GO, 30, decor.WCSyncWidth),
),
mpb.AppendDecorators(
// note that OnComplete will not be fired, because of cancel
decor.OnComplete(decor.Percentage(decor.WC{W: 5}), "done"),
),
)
go func() {
defer wg.Done()
rng := rand.New(rand.NewSource(time.Now().UnixNano()))
max := 100 * time.Millisecond
for bar.IsRunning() {
// start variable is solely for EWMA calculation
// EWMA's unit of measure is an iteration's duration
start := time.Now()
time.Sleep(time.Duration(rng.Intn(10)+1) * max / 10)
// we need to call EwmaIncrement to fulfill ewma decorator's contract
bar.EwmaIncrement(time.Since(start))
}
}()
}
// wait for passed wg and for all bars to complete and flush
p.Wait()
}
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