Repository navigation
Expand file tree
/
Copy pathfs-object.go
More file actions
369 lines (332 loc) · 10.7 KB
/
Copy pathfs-object.go
File metadata and controls
369 lines (332 loc) · 10.7 KB
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
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
/*
* Minio Cloud Storage, (C) 2015 Minio, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package main
import (
"bytes"
"crypto/md5"
"io"
"os"
"path/filepath"
"strings"
"encoding/hex"
"runtime"
"github.com/minio/minio/pkg/atomic"
"github.com/minio/minio/pkg/disk"
"github.com/minio/minio/pkg/mimedb"
"github.com/minio/minio/pkg/probe"
)
/// Object Operations
// GetObject - GET object
func (fs Filesystem) GetObject(bucket, object string, startOffset int64) (io.ReadCloser, *probe.Error) {
// Input validation.
if !IsValidBucketName(bucket) {
return nil, probe.NewError(BucketNameInvalid{Bucket: bucket})
}
if !IsValidObjectName(object) {
return nil, probe.NewError(ObjectNameInvalid{Bucket: bucket, Object: object})
}
// normalize buckets.
bucket = getActualBucketname(fs.path, bucket)
objectPath := filepath.Join(fs.path, bucket, object)
file, e := os.Open(objectPath)
if e != nil {
// If the object doesn't exist, the bucket might not exist either. Stat for
// the bucket and give a better error message if that is true.
if os.IsNotExist(e) {
_, e = os.Stat(filepath.Join(fs.path, bucket))
if os.IsNotExist(e) {
return nil, probe.NewError(BucketNotFound{Bucket: bucket})
}
return nil, probe.NewError(ObjectNotFound{Bucket: bucket, Object: object})
}
return nil, probe.NewError(e)
}
// Initiate a cached stat operation on the file handler.
st, e := file.Stat()
if e != nil {
return nil, probe.NewError(e)
}
// Object path is a directory prefix, return object not found error.
if st.IsDir() {
return nil, probe.NewError(ObjectNotFound{Bucket: bucket, Object: object})
}
// Seet to a starting offset.
_, e = file.Seek(startOffset, os.SEEK_SET)
if e != nil {
// When the "handle is invalid", the file might be a directory on Windows.
if runtime.GOOS == "windows" && strings.Contains(e.Error(), "handle is invalid") {
return nil, probe.NewError(ObjectNotFound{Bucket: bucket, Object: object})
}
return nil, probe.NewError(e)
}
// Return successfully seeked file handler.
return file, nil
}
// GetObjectInfo - get object info.
func (fs Filesystem) GetObjectInfo(bucket, object string) (ObjectInfo, *probe.Error) {
// Input validation.
if !IsValidBucketName(bucket) {
return ObjectInfo{}, probe.NewError(BucketNameInvalid{Bucket: bucket})
}
if !IsValidObjectName(object) {
return ObjectInfo{}, probe.NewError(ObjectNameInvalid{Bucket: bucket, Object: object})
}
// Normalize buckets.
bucket = getActualBucketname(fs.path, bucket)
bucketPath := filepath.Join(fs.path, bucket)
if _, e := os.Stat(bucketPath); e != nil {
if os.IsNotExist(e) {
return ObjectInfo{}, probe.NewError(BucketNotFound{Bucket: bucket})
}
return ObjectInfo{}, probe.NewError(e)
}
info, err := getObjectInfo(fs.path, bucket, object)
if err != nil {
if os.IsNotExist(err.ToGoError()) {
return ObjectInfo{}, probe.NewError(ObjectNotFound{Bucket: bucket, Object: object})
}
return ObjectInfo{}, err.Trace(bucket, object)
}
if info.IsDir {
return ObjectInfo{}, probe.NewError(ObjectNotFound{Bucket: bucket, Object: object})
}
return info, nil
}
// getObjectInfo - get object stat info.
func getObjectInfo(rootPath, bucket, object string) (ObjectInfo, *probe.Error) {
// Do not use filepath.Join() since filepath.Join strips off any
// object names with '/', use them as is in a static manner so
// that we can send a proper 'ObjectNotFound' reply back upon os.Stat().
var objectPath string
// For windows use its special os.PathSeparator == "\\"
if runtime.GOOS == "windows" {
objectPath = rootPath + string(os.PathSeparator) + bucket + string(os.PathSeparator) + object
} else {
objectPath = rootPath + string(os.PathSeparator) + bucket + string(os.PathSeparator) + object
}
stat, e := os.Stat(objectPath)
if e != nil {
return ObjectInfo{}, probe.NewError(e)
}
contentType := "application/octet-stream"
if runtime.GOOS == "windows" {
object = filepath.ToSlash(object)
}
if objectExt := filepath.Ext(object); objectExt != "" {
content, ok := mimedb.DB[strings.ToLower(strings.TrimPrefix(objectExt, "."))]
if ok {
contentType = content.ContentType
}
}
metadata := ObjectInfo{
Bucket: bucket,
Name: object,
ModifiedTime: stat.ModTime(),
Size: stat.Size(),
ContentType: contentType,
IsDir: stat.Mode().IsDir(),
}
return metadata, nil
}
// isMD5SumEqual - returns error if md5sum mismatches, success its `nil`
func isMD5SumEqual(expectedMD5Sum, actualMD5Sum string) bool {
// Verify the md5sum.
if expectedMD5Sum != "" && actualMD5Sum != "" {
// Decode md5sum to bytes from their hexadecimal
// representations.
expectedMD5SumBytes, err := hex.DecodeString(expectedMD5Sum)
if err != nil {
return false
}
actualMD5SumBytes, err := hex.DecodeString(actualMD5Sum)
if err != nil {
return false
}
// Verify md5sum bytes are equal after successful decoding.
if !bytes.Equal(expectedMD5SumBytes, actualMD5SumBytes) {
return false
}
return true
}
return false
}
// PutObject - create an object.
func (fs Filesystem) PutObject(bucket string, object string, size int64, data io.Reader, metadata map[string]string) (ObjectInfo, *probe.Error) {
di, e := disk.GetInfo(fs.path)
if e != nil {
return ObjectInfo{}, probe.NewError(e)
}
// Remove 5% from total space for cumulative disk space used for
// journalling, inodes etc.
availableDiskSpace := (float64(di.Free) / (float64(di.Total) - (0.05 * float64(di.Total)))) * 100
if int64(availableDiskSpace) <= fs.minFreeDisk {
return ObjectInfo{}, probe.NewError(RootPathFull{Path: fs.path})
}
// Check bucket name valid.
if !IsValidBucketName(bucket) {
return ObjectInfo{}, probe.NewError(BucketNameInvalid{Bucket: bucket})
}
bucket = getActualBucketname(fs.path, bucket)
bucketPath := filepath.Join(fs.path, bucket)
if _, e = os.Stat(bucketPath); e != nil {
if os.IsNotExist(e) {
return ObjectInfo{}, probe.NewError(BucketNotFound{Bucket: bucket})
}
return ObjectInfo{}, probe.NewError(e)
}
// Verify object path legal.
if !IsValidObjectName(object) {
return ObjectInfo{}, probe.NewError(ObjectNameInvalid{Bucket: bucket, Object: object})
}
// Get object path.
objectPath := filepath.Join(bucketPath, object)
// md5Hex representation.
var md5Hex string
if len(metadata) != 0 {
md5Hex = metadata["md5Sum"]
}
// Write object.
file, e := atomic.FileCreateWithPrefix(objectPath, md5Hex+"$tmpobject")
if e != nil {
switch e := e.(type) {
case *os.PathError:
if e.Op == "mkdir" {
if strings.Contains(e.Error(), "not a directory") {
return ObjectInfo{}, probe.NewError(ObjectExistsAsPrefix{Bucket: bucket, Prefix: object})
}
}
return ObjectInfo{}, probe.NewError(e)
default:
return ObjectInfo{}, probe.NewError(e)
}
}
defer file.Close()
// Initialize md5 writer.
md5Writer := md5.New()
// Instantiate a new multi writer.
multiWriter := io.MultiWriter(md5Writer, file)
// Instantiate checksum hashers and create a multiwriter.
if size > 0 {
if _, e = io.CopyN(multiWriter, data, size); e != nil {
file.CloseAndPurge()
return ObjectInfo{}, probe.NewError(e)
}
} else {
if _, e = io.Copy(multiWriter, data); e != nil {
file.CloseAndPurge()
return ObjectInfo{}, probe.NewError(e)
}
}
newMD5Hex := hex.EncodeToString(md5Writer.Sum(nil))
if md5Hex != "" {
if newMD5Hex != md5Hex {
return ObjectInfo{}, probe.NewError(BadDigest{md5Hex, newMD5Hex})
}
}
// Set stat again to get the latest metadata.
st, e := os.Stat(file.Name())
if e != nil {
return ObjectInfo{}, probe.NewError(e)
}
contentType := "application/octet-stream"
if objectExt := filepath.Ext(objectPath); objectExt != "" {
content, ok := mimedb.DB[strings.ToLower(strings.TrimPrefix(objectExt, "."))]
if ok {
contentType = content.ContentType
}
}
newObject := ObjectInfo{
Bucket: bucket,
Name: object,
ModifiedTime: st.ModTime(),
Size: st.Size(),
MD5Sum: newMD5Hex,
ContentType: contentType,
}
return newObject, nil
}
// deleteObjectPath - delete object path if its empty.
func deleteObjectPath(basePath, deletePath, bucket, object string) *probe.Error {
if basePath == deletePath {
return nil
}
// Verify if the path exists.
pathSt, e := os.Stat(deletePath)
if e != nil {
if os.IsNotExist(e) {
return probe.NewError(ObjectNotFound{Bucket: bucket, Object: object})
}
return probe.NewError(e)
}
if pathSt.IsDir() {
// Verify if directory is empty.
empty, e := isDirEmpty(deletePath)
if e != nil {
return probe.NewError(e)
}
if !empty {
return nil
}
}
// Attempt to remove path.
if e := os.Remove(deletePath); e != nil {
return probe.NewError(e)
}
// Recursively go down the next path and delete again.
if err := deleteObjectPath(basePath, filepath.Dir(deletePath), bucket, object); err != nil {
return err.Trace(basePath, deletePath, bucket, object)
}
return nil
}
// DeleteObject - delete object.
func (fs Filesystem) DeleteObject(bucket, object string) *probe.Error {
// Check bucket name valid
if !IsValidBucketName(bucket) {
return probe.NewError(BucketNameInvalid{Bucket: bucket})
}
bucket = getActualBucketname(fs.path, bucket)
bucketPath := filepath.Join(fs.path, bucket)
// Check bucket exists
if _, e := os.Stat(bucketPath); e != nil {
if os.IsNotExist(e) {
return probe.NewError(BucketNotFound{Bucket: bucket})
}
return probe.NewError(e)
}
// Verify object path legal
if !IsValidObjectName(object) {
return probe.NewError(ObjectNameInvalid{Bucket: bucket, Object: object})
}
// Do not use filepath.Join() since filepath.Join strips off any
// object names with '/', use them as is in a static manner so
// that we can send a proper 'ObjectNotFound' reply back upon
// os.Stat().
var objectPath string
if runtime.GOOS == "windows" {
objectPath = fs.path + string(os.PathSeparator) + bucket + string(os.PathSeparator) + object
} else {
objectPath = fs.path + string(os.PathSeparator) + bucket + string(os.PathSeparator) + object
}
// Delete object path if its empty.
err := deleteObjectPath(bucketPath, objectPath, bucket, object)
if err != nil {
if os.IsNotExist(err.ToGoError()) {
return probe.NewError(ObjectNotFound{Bucket: bucket, Object: object})
}
return err.Trace(bucketPath, objectPath, bucket, object)
}
return nil
}