forked from mongodb/mongo-tools
/
mongofiles.go
381 lines (319 loc) · 9.92 KB
/
mongofiles.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
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
370
371
372
373
374
375
376
377
378
379
380
381
// Package mongofiles provides an interface to GridFS collections in a MongoDB instance.
package mongofiles
import (
"fmt"
"github.com/mongodb/mongo-tools/common/bsonutil"
"github.com/mongodb/mongo-tools/common/db"
"github.com/mongodb/mongo-tools/common/json"
"github.com/mongodb/mongo-tools/common/log"
"github.com/mongodb/mongo-tools/common/options"
"github.com/mongodb/mongo-tools/common/util"
"gopkg.in/mgo.v2"
"gopkg.in/mgo.v2/bson"
"io"
"os"
"regexp"
"time"
)
// List of possible commands for mongofiles.
const (
List = "list"
Search = "search"
Put = "put"
Get = "get"
GetID = "get_id"
Delete = "delete"
DeleteID = "delete_id"
)
// MongoFiles is a container for the user-specified options and
// internal state used for running mongofiles.
type MongoFiles struct {
// generic mongo tool options
ToolOptions *options.ToolOptions
// mongofiles-specific storage options
StorageOptions *StorageOptions
// for connecting to the db
SessionProvider *db.SessionProvider
// command to run
Command string
// filename in GridFS
FileName string
}
// GFSFile represents a GridFS file.
type GFSFile struct {
Id bson.ObjectId `bson:"_id"`
ChunkSize int `bson:"chunkSize"`
Name string `bson:"filename"`
Length int64 `bson:"length"`
Md5 string `bson:"md5"`
UploadDate time.Time `bson:"uploadDate"`
ContentType string `bson:"contentType,omitempty"`
}
// ValidateCommand ensures the arguments supplied are valid.
func (mf *MongoFiles) ValidateCommand(args []string) error {
// make sure a command is specified and that we don't have
// too many arguments
if len(args) == 0 {
return fmt.Errorf("no command specified")
} else if len(args) > 2 {
return fmt.Errorf("too many positional arguments")
}
var fileName string
switch args[0] {
case List:
if len(args) == 1 {
fileName = ""
} else {
fileName = args[1]
}
case Search, Put, Get, Delete, GetID, DeleteID:
// also make sure the supporting argument isn't literally an
// empty string for example, mongofiles get ""
if len(args) == 1 || args[1] == "" {
return fmt.Errorf("'%v' argument missing", args[0])
}
fileName = args[1]
default:
return fmt.Errorf("'%v' is not a valid command", args[0])
}
if mf.StorageOptions.GridFSPrefix == "" {
return fmt.Errorf("--prefix can not be blank")
}
// set the mongofiles command and file name
mf.Command = args[0]
mf.FileName = fileName
return nil
}
// Query GridFS for files and display the results.
func (mf *MongoFiles) findAndDisplay(gfs *mgo.GridFS, query bson.M) (string, error) {
display := ""
cursor := gfs.Find(query).Iter()
defer cursor.Close()
var file GFSFile
for cursor.Next(&file) {
display += fmt.Sprintf("%s\t%d\n", file.Name, file.Length)
}
if err := cursor.Err(); err != nil {
return "", fmt.Errorf("error retrieving list of GridFS files: %v", err)
}
return display, nil
}
// Return the local filename, as specified by the --local flag. Defaults to
// the GridFile's name if not present. If GridFile is nil, uses the filename
// given on the command line.
func (mf *MongoFiles) getLocalFileName(gridFile *mgo.GridFile) string {
localFileName := mf.StorageOptions.LocalFileName
if localFileName == "" {
if gridFile != nil {
localFileName = gridFile.Name()
} else {
localFileName = mf.FileName
}
}
return localFileName
}
// handle logic for 'get' command
func (mf *MongoFiles) handleGet(gfs *mgo.GridFS) (string, error) {
gFile, err := gfs.Open(mf.FileName)
if err != nil {
return "", fmt.Errorf("error opening GridFS file '%s': %v", mf.FileName, err)
}
defer gFile.Close()
if err = mf.writeFile(gFile); err != nil {
return "", err
}
return fmt.Sprintf("finished writing to %s\n", mf.getLocalFileName(gFile)), nil
}
// handle logic for 'get_id' command
func (mf *MongoFiles) handleGetID(gfs *mgo.GridFS) (string, error) {
id, err := mf.parseID()
if err != nil {
return "", err
}
// with the parsed _id, grab the file and write it to disk
gFile, err := gfs.OpenId(id)
if err != nil {
return "", fmt.Errorf("error opening GridFS file with _id %s: %v", mf.FileName, err)
}
log.Logf(log.Always, "found file '%v' with _id %v", gFile.Name(), mf.FileName)
defer gFile.Close()
if err = mf.writeFile(gFile); err != nil {
return "", err
}
return fmt.Sprintf("finished writing to: %s\n", mf.getLocalFileName(gFile)), nil
}
// logic for deleting a file with 'delete_id'
func (mf *MongoFiles) handleDeleteID(gfs *mgo.GridFS) (string, error) {
id, err := mf.parseID()
if err != nil {
return "", err
}
if err = gfs.RemoveId(id); err != nil {
return "", fmt.Errorf("error while removing file with _id %v from GridFS: %v\n", mf.FileName, err)
}
return fmt.Sprintf("successfully deleted file with _id %v from GridFS\n", mf.FileName), nil
}
// parse and convert extended JSON
func (mf *MongoFiles) parseID() (interface{}, error) {
// parse the id using extended json
var asJSON interface{}
err := json.Unmarshal([]byte(mf.FileName), &asJSON)
if err != nil {
return nil, fmt.Errorf(
"error parsing _id as json: %v; make sure you are properly escaping input", err)
}
id, err := bsonutil.ConvertJSONValueToBSON(asJSON)
if err != nil {
return nil, fmt.Errorf("error converting _id to bson: %v", err)
}
return id, nil
}
// writeFile writes a file from gridFS to stdout or the filesystem.
func (mf *MongoFiles) writeFile(gridFile *mgo.GridFile) (err error) {
localFileName := mf.getLocalFileName(gridFile)
var localFile io.WriteCloser
if localFileName == "-" {
localFile = os.Stdout
} else {
if localFile, err = os.Create(localFileName); err != nil {
return fmt.Errorf("error while opening local file '%v': %v\n", localFileName, err)
}
defer localFile.Close()
log.Logf(log.DebugLow, "created local file '%v'", localFileName)
}
if _, err = io.Copy(localFile, gridFile); err != nil {
return fmt.Errorf("error while writing data into local file '%v': %v\n", localFileName, err)
}
return nil
}
// handle logic for 'put' command.
func (mf *MongoFiles) handlePut(gfs *mgo.GridFS) (string, error) {
localFileName := mf.getLocalFileName(nil)
var output string
// check if --replace flag turned on
if mf.StorageOptions.Replace {
err := gfs.Remove(mf.FileName)
if err != nil {
return "", err
}
output = fmt.Sprintf("removed all instances of '%v' from GridFS\n", mf.FileName)
}
var err error
var localFile io.ReadCloser
if localFileName == "-" {
localFile = os.Stdin
} else {
localFile, err = os.Open(localFileName)
if err != nil {
return "", fmt.Errorf("error while opening local file '%v' : %v\n", localFileName, err)
}
defer localFile.Close()
log.Logf(log.DebugLow, "creating GridFS file '%v' from local file '%v'", mf.FileName, localFileName)
}
gFile, err := gfs.Create(mf.FileName)
if err != nil {
return "", fmt.Errorf("error while creating '%v' in GridFS: %v\n", mf.FileName, err)
}
defer gFile.Close()
// set optional mime type
if mf.StorageOptions.ContentType != "" {
gFile.SetContentType(mf.StorageOptions.ContentType)
}
_, err = io.Copy(gFile, localFile)
if err != nil {
return "", fmt.Errorf("error while storing '%v' into GridFS: %v\n", localFileName, err)
}
output += fmt.Sprintf("added file: %v\n", gFile.Name())
return output, nil
}
// Run the mongofiles utility. If displayHost is true, the connected host/port is
// displayed.
func (mf *MongoFiles) Run(displayHost bool) (string, error) {
connUrl := mf.ToolOptions.Host
if connUrl == "" {
connUrl = util.DefaultHost
}
if mf.ToolOptions.Port != "" {
connUrl = fmt.Sprintf("%s:%s", connUrl, mf.ToolOptions.Port)
}
// get session
session, err := mf.SessionProvider.GetSession()
if err != nil {
return "", err
}
defer session.Close()
// check type of node we're connected to, and fall back to w=1 if standalone (for <= 2.4)
nodeType, err := mf.SessionProvider.GetNodeType()
if err != nil {
return "", fmt.Errorf("error determining type of node connected: %v", err)
}
log.Logf(log.DebugLow, "connected to node type: %v", nodeType)
safety, err := db.BuildWriteConcern(mf.StorageOptions.WriteConcern, nodeType)
if err != nil {
return "", fmt.Errorf("error parsing write concern: %v", err)
}
// configure the session with the appropriate write concern and ensure the
// socket does not timeout
session.SetSafe(safety)
session.SetSocketTimeout(0)
if displayHost {
log.Logf(log.Always, "connected to: %v", connUrl)
}
// first validate the namespaces we'll be using: <db>.<prefix>.files and <db>.<prefix>.chunks
// it's ok to validate only <db>.<prefix>.chunks (the longer one)
err = util.ValidateFullNamespace(fmt.Sprintf("%s.%s.chunks", mf.StorageOptions.DB,
mf.StorageOptions.GridFSPrefix))
if err != nil {
return "", err
}
// get GridFS handle
gfs := session.DB(mf.StorageOptions.DB).GridFS(mf.StorageOptions.GridFSPrefix)
var output string
log.Logf(log.Info, "handling mongofiles '%v' command...", mf.Command)
switch mf.Command {
case List:
query := bson.M{}
if mf.FileName != "" {
regex := bson.M{"$regex": "^" + regexp.QuoteMeta(mf.FileName)}
query = bson.M{"filename": regex}
}
output, err = mf.findAndDisplay(gfs, query)
if err != nil {
return "", err
}
case Search:
regex := bson.M{"$regex": mf.FileName}
query := bson.M{"filename": regex}
output, err = mf.findAndDisplay(gfs, query)
if err != nil {
return "", err
}
case Get:
output, err = mf.handleGet(gfs)
if err != nil {
return "", err
}
case GetID:
output, err = mf.handleGetID(gfs)
if err != nil {
return "", err
}
case Put:
output, err = mf.handlePut(gfs)
if err != nil {
return "", err
}
case Delete:
err = gfs.Remove(mf.FileName)
if err != nil {
return "", fmt.Errorf("error while removing '%v' from GridFS: %v\n", mf.FileName, err)
}
output = fmt.Sprintf("successfully deleted all instances of '%v' from GridFS\n", mf.FileName)
case DeleteID:
output, err = mf.handleDeleteID(gfs)
if err != nil {
return "", err
}
}
return output, nil
}