forked from rclone/rclone
-
Notifications
You must be signed in to change notification settings - Fork 0
/
object.go
235 lines (203 loc) · 6.23 KB
/
object.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
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
package fs
import (
"bytes"
"errors"
"io"
"io/ioutil"
"time"
)
// NewStaticObjectInfo returns a static ObjectInfo
// If hashes is nil and fs is not nil, the hash map will be replaced with
// empty hashes of the types supported by the fs.
func NewStaticObjectInfo(remote string, modTime time.Time, size int64, storable bool, hashes map[HashType]string, fs Info) ObjectInfo {
info := &staticObjectInfo{
remote: remote,
modTime: modTime,
size: size,
storable: storable,
hashes: hashes,
fs: fs,
}
if fs != nil && hashes == nil {
set := fs.Hashes().Array()
info.hashes = make(map[HashType]string)
for _, ht := range set {
info.hashes[ht] = ""
}
}
return info
}
type staticObjectInfo struct {
remote string
modTime time.Time
size int64
storable bool
hashes map[HashType]string
fs Info
}
func (i *staticObjectInfo) Fs() Info { return i.fs }
func (i *staticObjectInfo) Remote() string { return i.remote }
func (i *staticObjectInfo) String() string { return i.remote }
func (i *staticObjectInfo) ModTime() time.Time { return i.modTime }
func (i *staticObjectInfo) Size() int64 { return i.size }
func (i *staticObjectInfo) Storable() bool { return i.storable }
func (i *staticObjectInfo) Hash(h HashType) (string, error) {
if len(i.hashes) == 0 {
return "", ErrHashUnsupported
}
if hash, ok := i.hashes[h]; ok {
return hash, nil
}
return "", ErrHashUnsupported
}
// MemoryFs is an in memory Fs, it only supports FsInfo and Put
var MemoryFs memoryFs
// memoryFs is an in memory fs
type memoryFs struct{}
// Name of the remote (as passed into NewFs)
func (memoryFs) Name() string { return "memory" }
// Root of the remote (as passed into NewFs)
func (memoryFs) Root() string { return "" }
// String returns a description of the FS
func (memoryFs) String() string { return "memory" }
// Precision of the ModTimes in this Fs
func (memoryFs) Precision() time.Duration { return time.Nanosecond }
// Returns the supported hash types of the filesystem
func (memoryFs) Hashes() HashSet { return SupportedHashes }
// Features returns the optional features of this Fs
func (memoryFs) Features() *Features { return &Features{} }
// List the objects and directories in dir into entries. The
// entries can be returned in any order but should be for a
// complete directory.
//
// dir should be "" to list the root, and should not have
// trailing slashes.
//
// This should return ErrDirNotFound if the directory isn't
// found.
func (memoryFs) List(dir string) (entries DirEntries, err error) {
return nil, nil
}
// NewObject finds the Object at remote. If it can't be found
// it returns the error ErrorObjectNotFound.
func (memoryFs) NewObject(remote string) (Object, error) {
return nil, ErrorObjectNotFound
}
// Put in to the remote path with the modTime given of the given size
//
// May create the object even if it returns an error - if so
// will return the object and the error, otherwise will return
// nil and the error
func (memoryFs) Put(in io.Reader, src ObjectInfo, options ...OpenOption) (Object, error) {
o := NewMemoryObject(src.Remote(), src.ModTime(), nil)
return o, o.Update(in, src, options...)
}
// Mkdir makes the directory (container, bucket)
//
// Shouldn't return an error if it already exists
func (memoryFs) Mkdir(dir string) error {
return errors.New("memoryFs: can't make directory")
}
// Rmdir removes the directory (container, bucket) if empty
//
// Return an error if it doesn't exist or isn't empty
func (memoryFs) Rmdir(dir string) error {
return ErrorDirNotFound
}
var _ Fs = MemoryFs
// MemoryObject is an in memory object
type MemoryObject struct {
remote string
modTime time.Time
content []byte
}
// NewMemoryObject returns an in memory Object with the modTime and content passed in
func NewMemoryObject(remote string, modTime time.Time, content []byte) *MemoryObject {
return &MemoryObject{
remote: remote,
modTime: modTime,
content: content,
}
}
// Content returns the underlying buffer
func (o *MemoryObject) Content() []byte {
return o.content
}
// Fs returns read only access to the Fs that this object is part of
func (o *MemoryObject) Fs() Info {
return MemoryFs
}
// Remote returns the remote path
func (o *MemoryObject) Remote() string {
return o.remote
}
// String returns a description of the Object
func (o *MemoryObject) String() string {
return o.remote
}
// ModTime returns the modification date of the file
func (o *MemoryObject) ModTime() time.Time {
return o.modTime
}
// Size returns the size of the file
func (o *MemoryObject) Size() int64 {
return int64(len(o.content))
}
// Storable says whether this object can be stored
func (o *MemoryObject) Storable() bool {
return true
}
// Hash returns the requested hash of the contents
func (o *MemoryObject) Hash(h HashType) (string, error) {
hash, err := NewMultiHasherTypes(HashSet(h))
if err != nil {
return "", err
}
_, err = hash.Write(o.content)
if err != nil {
return "", err
}
return hash.Sums()[h], nil
}
// SetModTime sets the metadata on the object to set the modification date
func (o *MemoryObject) SetModTime(modTime time.Time) error {
o.modTime = modTime
return nil
}
// Open opens the file for read. Call Close() on the returned io.ReadCloser
func (o *MemoryObject) Open(options ...OpenOption) (io.ReadCloser, error) {
content := o.content
for _, option := range options {
switch x := option.(type) {
case *RangeOption:
content = o.content[x.Start:x.End]
case *SeekOption:
content = o.content[x.Offset:]
default:
if option.Mandatory() {
Logf(o, "Unsupported mandatory option: %v", option)
}
}
}
return ioutil.NopCloser(bytes.NewBuffer(content)), nil
}
// Update in to the object with the modTime given of the given size
//
// This re-uses the internal buffer if at all possible.
func (o *MemoryObject) Update(in io.Reader, src ObjectInfo, options ...OpenOption) (err error) {
size := src.Size()
if size == 0 {
o.content = nil
} else if size < 0 || int64(cap(o.content)) < size {
o.content, err = ioutil.ReadAll(in)
} else {
o.content = o.content[:size]
_, err = io.ReadFull(in, o.content)
}
o.modTime = src.ModTime()
return err
}
// Remove this object
func (o *MemoryObject) Remove() error {
return errors.New("memoryObject.Remove not supported")
}