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main.go
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main.go
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package main
import (
"io"
"math/rand"
"time"
"github.com/mikewiacek/mpb"
"github.com/mikewiacek/mpb/decor"
)
func init() {
rand.Seed(time.Now().UnixNano())
}
func main() {
p := mpb.New(mpb.WithWidth(64))
var total int64
bar := p.AddBar(total,
mpb.PrependDecorators(decor.Counters(decor.UnitKiB, "% .1f / % .1f")),
mpb.AppendDecorators(decor.Percentage()),
)
maxSleep := 100 * time.Millisecond
read := makeStream(200)
for {
n, err := read()
total += int64(n)
if err == io.EOF {
break
}
// while total is unknown,
// set it to a positive number which is greater than current total,
// to make sure no complete event is triggered by next IncrBy call.
bar.SetTotal(total+2048, false)
bar.IncrBy(n)
time.Sleep(time.Duration(rand.Intn(10)+1) * maxSleep / 10)
}
// force bar complete event, note true flag
bar.SetTotal(total, true)
p.Wait()
}
func makeStream(limit int) func() (int, error) {
return func() (int, error) {
if limit <= 0 {
return 0, io.EOF
}
limit--
return rand.Intn(1024) + 1, nil
}
}