|
0 |
package main
|
|
1 |
|
|
2 |
import (
|
|
3 |
"fmt"
|
|
4 |
"io"
|
|
5 |
"math/rand"
|
|
6 |
"time"
|
|
7 |
|
|
8 |
"github.com/vbauerster/mpb/v4"
|
|
9 |
"github.com/vbauerster/mpb/v4/decor"
|
|
10 |
)
|
|
11 |
|
|
12 |
func main() {
|
|
13 |
p := mpb.New()
|
|
14 |
|
|
15 |
total := 100
|
|
16 |
msgCh := make(chan string)
|
|
17 |
filler, nextCh := makeCustomFiller(15, msgCh)
|
|
18 |
bar := p.Add(int64(total), filler,
|
|
19 |
mpb.PrependDecorators(
|
|
20 |
decor.Name("my bar:"),
|
|
21 |
),
|
|
22 |
mpb.AppendDecorators(
|
|
23 |
newCustomPercentage(decor.Percentage(), nextCh),
|
|
24 |
),
|
|
25 |
)
|
|
26 |
// simulating some work
|
|
27 |
go func() {
|
|
28 |
rng := rand.New(rand.NewSource(time.Now().UnixNano()))
|
|
29 |
max := 100 * time.Millisecond
|
|
30 |
for i := 0; i < total; i++ {
|
|
31 |
time.Sleep(time.Duration(rng.Intn(10)+1) * max / 10)
|
|
32 |
if i == 33 {
|
|
33 |
msgCh <- "some error, retrying..."
|
|
34 |
}
|
|
35 |
bar.Increment()
|
|
36 |
}
|
|
37 |
}()
|
|
38 |
|
|
39 |
p.Wait()
|
|
40 |
}
|
|
41 |
|
|
42 |
func makeCustomFiller(maxFlash int, ch <-chan string) (mpb.FillerFunc, <-chan struct{}) {
|
|
43 |
type refiller interface {
|
|
44 |
SetRefill(int64)
|
|
45 |
}
|
|
46 |
filler := mpb.NewBarFiller()
|
|
47 |
nextCh := make(chan struct{}, 1)
|
|
48 |
var msg string
|
|
49 |
var count int
|
|
50 |
return func(w io.Writer, width int, st *decor.Statistics) {
|
|
51 |
if count != 0 {
|
|
52 |
nextCh <- struct{}{}
|
|
53 |
limitFmt := fmt.Sprintf("%%.%ds", width)
|
|
54 |
fmt.Fprintf(w, limitFmt, msg)
|
|
55 |
count--
|
|
56 |
return
|
|
57 |
}
|
|
58 |
select {
|
|
59 |
case msg = <-ch:
|
|
60 |
nextCh <- struct{}{}
|
|
61 |
if f, ok := filler.(refiller); ok {
|
|
62 |
defer f.SetRefill(st.Current)
|
|
63 |
}
|
|
64 |
count = maxFlash
|
|
65 |
default:
|
|
66 |
}
|
|
67 |
filler.Fill(w, width, st)
|
|
68 |
}, nextCh
|
|
69 |
}
|
|
70 |
|
|
71 |
type myPercentageDecorator struct {
|
|
72 |
decor.Decorator
|
|
73 |
ch <-chan struct{}
|
|
74 |
}
|
|
75 |
|
|
76 |
func (d *myPercentageDecorator) Decor(st *decor.Statistics) string {
|
|
77 |
select {
|
|
78 |
case <-d.ch:
|
|
79 |
return ""
|
|
80 |
default:
|
|
81 |
return d.Decorator.Decor(st)
|
|
82 |
}
|
|
83 |
}
|
|
84 |
|
|
85 |
func newCustomPercentage(base decor.Decorator, ch <-chan struct{}) decor.Decorator {
|
|
86 |
return &myPercentageDecorator{
|
|
87 |
Decorator: base,
|
|
88 |
ch: ch,
|
|
89 |
}
|
|
90 |
}
|