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package main
import (
"errors"
"fmt"
"math"
"math/rand"
"sync"
"time"
"github.com/vbauerster/mpb/v8"
"github.com/vbauerster/mpb/v8/decor"
)
func main() {
p := mpb.New()
total, numBars := 100, 3
err := new(errorWrapper)
timer := time.AfterFunc(2*time.Second, func() {
err.set(errors.New("timeout"), rand.Intn(numBars))
})
defer timer.Stop()
for i := 0; i < numBars; i++ {
msgCh := make(chan string, 1)
bar := p.AddBar(int64(total),
mpb.PrependDecorators(newTitleDecorator(fmt.Sprintf("Bar#%d:", i), msgCh, 16)),
mpb.AppendDecorators(decor.Percentage(decor.WCSyncWidth)),
)
// simulating some work
barID := i
go func() {
max := 100 * time.Millisecond
for i := 0; i < total; i++ {
if err.check(barID) {
msgCh <- fmt.Sprintf("%s at %d, retrying...", err.Error(), i)
err.reset()
i--
bar.SetRefill(int64(i))
continue
}
time.Sleep(time.Duration(rand.Intn(10)+1) * max / 10)
bar.Increment()
}
}()
}
p.Wait()
}
type errorWrapper struct {
sync.RWMutex
err error
barID int
}
func (ew *errorWrapper) Error() string {
ew.RLock()
defer ew.RUnlock()
return ew.err.Error()
}
func (ew *errorWrapper) check(barID int) bool {
ew.RLock()
defer ew.RUnlock()
return ew.err != nil && ew.barID == barID
}
func (ew *errorWrapper) set(err error, barID int) {
ew.Lock()
ew.err = err
ew.barID = barID
ew.Unlock()
}
func (ew *errorWrapper) reset() {
ew.Lock()
ew.err = nil
ew.Unlock()
}
type title struct {
decor.Decorator
name string
msgCh <-chan string
msg string
count int
limit int
}
func (d *title) Decor(stat decor.Statistics) (string, int) {
if d.count == 0 {
select {
case msg := <-d.msgCh:
d.count = d.limit
d.msg = msg
default:
return d.Decorator.Decor(stat)
}
}
d.count--
_, _ = d.Format("")
return fmt.Sprintf("%s %s", d.name, d.msg), math.MaxInt
}
func newTitleDecorator(name string, msgCh <-chan string, limit int) decor.Decorator {
return &title{
Decorator: decor.Name(name),
name: name,
msgCh: msgCh,
limit: limit,
}
}
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