-
Notifications
You must be signed in to change notification settings - Fork 29
/
file_service.go
executable file
·188 lines (163 loc) · 4.28 KB
/
file_service.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
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
package storage
import (
"fmt"
"github.com/pkg/errors"
"github.com/viant/toolbox"
"io"
"io/ioutil"
"net/url"
"os"
"path"
"strings"
)
var fileMode os.FileMode = 0644
var execFileMode os.FileMode = 0755
//Service represents abstract way to accessing local or remote storage
type fileStorageService struct{}
//List returns a list of object for supplied url
func (s *fileStorageService) List(URL string) ([]Object, error) {
file, err := toolbox.OpenFile(URL)
if err != nil {
return nil, err
}
defer file.Close()
stat, err := file.Stat()
if err == nil {
if !stat.IsDir() {
return []Object{
newFileObject(URL, stat),
}, nil
}
}
files, err := file.Readdir(0)
if err != nil {
return nil, err
}
var result = make([]Object, 0)
result = append(result, newFileObject(URL, stat))
var parsedURL, _ = url.Parse(URL)
for _, fileInfo := range files {
var fileName = fileInfo.Name()
if parsedURL != nil {
fileName = strings.Replace(fileName, parsedURL.Path, "", 1)
}
fileURL := toolbox.URLPathJoin(URL, fileName)
result = append(result, newFileObject(fileURL, fileInfo))
}
return result, nil
}
//Exists returns true if resource exists
func (s *fileStorageService) Exists(URL string) (bool, error) {
parsedUrl, err := url.Parse(URL)
if err != nil {
return false, err
}
if parsedUrl.Scheme != "file" {
return false, fmt.Errorf("invalid schema, expected file but had: %v", parsedUrl.Scheme)
}
return toolbox.FileExists(parsedUrl.Path), nil
}
func (s *fileStorageService) Close() error {
return nil
}
//Object returns a Object for supplied url
func (s *fileStorageService) StorageObject(URL string) (Object, error) {
file, err := toolbox.OpenFile(URL)
if err != nil {
return nil, err
}
defer file.Close()
fileInfo, err := os.Stat(file.Name())
if err != nil {
return nil, err
}
return newFileObject(URL, fileInfo), nil
}
//Download returns reader for downloaded storage object
func (s *fileStorageService) Download(object Object) (io.ReadCloser, error) {
return toolbox.OpenFile(object.URL())
}
//DownloadWithURL downloads content for passed in object URL
func (s *fileStorageService) DownloadWithURL(URL string) (io.ReadCloser, error) {
object, err := s.StorageObject(URL)
if err != nil {
return nil, err
}
return s.Download(object)
}
//Upload uploads provided reader content for supplied url.
func (s *fileStorageService) Upload(URL string, reader io.Reader) error {
parsedUrl, err := url.Parse(URL)
if err != nil {
return err
}
if parsedUrl.Scheme != "file" {
return fmt.Errorf("Invalid schema, expected file but had: %v", parsedUrl.Scheme)
}
parentDir, _ := path.Split(parsedUrl.Path)
err = toolbox.CreateDirIfNotExist(parentDir)
if err != nil {
return err
}
data, err := ioutil.ReadAll(reader)
if err != nil {
return err
}
if path.Ext(parsedUrl.Path) == "" {
return ioutil.WriteFile(parsedUrl.Path, data, execFileMode)
}
return ioutil.WriteFile(parsedUrl.Path, data, fileMode)
}
func (s *fileStorageService) Register(schema string, service Service) error {
return errors.New("unsupported")
}
//Delete removes passed in storage object
func (s *fileStorageService) Delete(object Object) error {
if object.IsFolder() {
objects, err := s.List(object.URL())
if err != nil {
return err
}
for _, listedObject := range objects {
if listedObject.URL() == object.URL() {
continue
}
if err := s.Delete(listedObject); err != nil {
return err
}
}
}
fileName := toolbox.Filename(object.URL())
return os.Remove(fileName)
}
type fileStorageObject struct {
*AbstractObject
}
func NewFileStorage() Service {
return &fileStorageService{}
}
func (o *fileStorageObject) Unwrap(target interface{}) error {
if fileInfo, casted := target.(*os.FileInfo); casted {
source, ok := o.Source.(os.FileInfo)
if !ok {
return fmt.Errorf("failed to cast %T into %T", o.Source, target)
}
*fileInfo = source
return nil
}
return fmt.Errorf("unsuported target %T", target)
}
func (o *fileStorageObject) FileInfo() os.FileInfo {
if source, ok := o.Source.(os.FileInfo); ok {
return source
}
return nil
}
func newFileObject(url string, fileInfo os.FileInfo) Object {
abstract := NewAbstractStorageObject(url, fileInfo, fileInfo)
result := &fileStorageObject{
AbstractObject: abstract,
}
result.AbstractObject.Object = result
return result
}