/
item.go
107 lines (92 loc) · 2.04 KB
/
item.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
96
97
98
99
100
101
102
103
104
105
106
107
package local
import (
"io"
"net/url"
"os"
"path/filepath"
"sync"
"time"
)
// Metadata constants describe the metadata available
// for a local Item.
const (
MetadataPath = "path"
MetadataIsDir = "is_dir"
MetadataDir = "dir"
MetadataName = "name"
MetadataMode = "mode"
MetadataModeD = "mode_d"
MetadataPerm = "perm"
MetadataINode = "inode"
MetadataSize = "size"
MetadataIsHardlink = "is_hardlink"
MetadataIsSymlink = "is_symlink"
MetadataLink = "link"
)
type item struct {
path string
contPrefixLen int
infoOnce sync.Once // protects info
info os.FileInfo
infoErr error
metadata map[string]interface{}
}
func (i *item) ID() string {
return i.path
}
func (i *item) Name() string {
return filepath.ToSlash(i.path[i.contPrefixLen:])
}
func (i *item) Size() (int64, error) {
err := i.ensureInfo()
if err != nil {
return 0, err
}
return i.info.Size(), nil
}
func (i *item) URL() *url.URL {
return &url.URL{
Scheme: "file",
Path: filepath.Clean(i.path),
}
}
func (i *item) ETag() (string, error) {
err := i.ensureInfo()
if err != nil {
return "", nil
}
return i.info.ModTime().String(), nil
}
// Open opens the file for reading.
func (i *item) Open() (io.ReadCloser, error) {
return os.Open(i.path)
}
func (i *item) LastMod() (time.Time, error) {
err := i.ensureInfo()
if err != nil {
return time.Time{}, nil
}
return i.info.ModTime(), nil
}
func (i *item) ensureInfo() error {
i.infoOnce.Do(func() {
i.info, i.infoErr = os.Lstat(i.path) // retrieve item file info
if i.infoErr != nil {
return
}
i.setMetadata(i.info) // merge file and metadata maps
})
return i.infoErr
}
func (i *item) setMetadata(info os.FileInfo) {
fileMetadata := getFileMetadata(i.path, info) // retrieve file metadata
i.metadata = fileMetadata
}
// Metadata gets stat information for the file.
func (i *item) Metadata() (map[string]interface{}, error) {
err := i.ensureInfo()
if err != nil {
return nil, err
}
return i.metadata, nil
}