/
decompressor.go
95 lines (86 loc) · 2.24 KB
/
decompressor.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
package decompressor
import (
"context"
"errors"
"fmt"
"io"
"github.com/reearth/reearthx/log"
"github.com/samber/lo"
)
var (
ErrUnsupportedExtension = errors.New("unsupported extension type")
)
type WalkFunc func(name string) (io.WriteCloser, error)
type ProgressFunc func(context.Context, int64) error
type Decompressor struct {
ar Archive
wFn WalkFunc
}
func New(r io.ReaderAt, size int64, ext string, wFn WalkFunc) (*Decompressor, error) {
var a Archive
switch ext {
case "zip":
var err error
a, err = newZipReader(r, size)
if err != nil {
return nil, err
}
case "7z":
var err error
a, err = new7ZipReader(r, size)
if err != nil {
return nil, err
}
default:
return nil, ErrUnsupportedExtension
}
return &Decompressor{
ar: a,
wFn: wFn,
}, nil
}
func (uz *Decompressor) Decompress(ctx context.Context, proceeded int64, progressFunc ProgressFunc) error {
if uz == nil {
return nil
}
archiveFiles := lo.Filter(uz.ar.Files(), func(f File, _ int) bool {
return !f.Skip()
})
log.Infof("archive total entries=%d,proceeded=%d", len(archiveFiles), proceeded)
return uz.read(ctx, archiveFiles, proceeded, progressFunc)
}
func (uz *Decompressor) read(ctx context.Context, zfs []File, proceeded int64, progressFunc ProgressFunc) error {
buf := make([]byte, 16*1024*1024)
for i := proceeded; i < int64(len(zfs)); i++ {
select {
case <-ctx.Done():
return ctx.Err()
default:
}
f := zfs[i]
fn := f.Name()
log.Infof("extracting file Size=%5d File=%s", f.Size(), fn)
x, err := f.Open()
if err != nil {
return fmt.Errorf("failed to open read file File=%s: %w", fn, err)
}
w, err := uz.wFn(fn)
if err != nil {
return fmt.Errorf("failed to invoke walk func File=%s: %w", fn, err)
}
if _, err := io.CopyBuffer(w, x, buf); err != nil {
return fmt.Errorf("failed to copy file to Storage File=%s: %w", fn, err)
}
// NOTE: do not use deffer to close the reader, writer!
if err := x.Close(); err != nil {
return fmt.Errorf("failed to close read file File=%s: %w", fn, err)
}
if err := w.Close(); err != nil {
return fmt.Errorf("failed to close write file File=%s: %w", fn, err)
}
if err := progressFunc(ctx, i+1); err != nil {
return fmt.Errorf("progress: %w", err)
}
}
return nil
}