/usr/share/gocode/src/github.com/minio/minio-go/api-put-object-multipart.go is in golang-github-minio-minio-go-dev 2.0.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 | /*
* Minio Go Library for Amazon S3 Compatible Cloud Storage (C) 2015, 2016 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 minio
import (
"bytes"
"crypto/md5"
"crypto/sha256"
"encoding/hex"
"encoding/xml"
"fmt"
"hash"
"io"
"io/ioutil"
"net/http"
"net/url"
"os"
"sort"
"strconv"
"strings"
)
// Comprehensive put object operation involving multipart resumable uploads.
//
// Following code handles these types of readers.
//
// - *os.File
// - *minio.Object
// - Any reader which has a method 'ReadAt()'
//
// If we exhaust all the known types, code proceeds to use stream as
// is where each part is re-downloaded, checksummed and verified
// before upload.
func (c Client) putObjectMultipart(bucketName, objectName string, reader io.Reader, size int64, contentType string, progress io.Reader) (n int64, err error) {
if size > 0 && size > minPartSize {
// Verify if reader is *os.File, then use file system functionalities.
if isFile(reader) {
return c.putObjectMultipartFromFile(bucketName, objectName, reader.(*os.File), size, contentType, progress)
}
// Verify if reader is *minio.Object or io.ReaderAt.
// NOTE: Verification of object is kept for a specific purpose
// while it is going to be duck typed similar to io.ReaderAt.
// It is to indicate that *minio.Object implements io.ReaderAt.
// and such a functionality is used in the subsequent code
// path.
if isObject(reader) || isReadAt(reader) {
return c.putObjectMultipartFromReadAt(bucketName, objectName, reader.(io.ReaderAt), size, contentType, progress)
}
}
// For any other data size and reader type we do generic multipart
// approach by staging data in temporary files and uploading them.
return c.putObjectMultipartStream(bucketName, objectName, reader, size, contentType, progress)
}
// putObjectStream uploads files bigger than 5MiB, and also supports
// special case where size is unknown i.e '-1'.
func (c Client) putObjectMultipartStream(bucketName, objectName string, reader io.Reader, size int64, contentType string, progress io.Reader) (n int64, err error) {
// Input validation.
if err := isValidBucketName(bucketName); err != nil {
return 0, err
}
if err := isValidObjectName(objectName); err != nil {
return 0, err
}
// Total data read and written to server. should be equal to 'size' at the end of the call.
var totalUploadedSize int64
// Complete multipart upload.
var complMultipartUpload completeMultipartUpload
// A map of all previously uploaded parts.
var partsInfo = make(map[int]objectPart)
// getUploadID for an object, initiates a new multipart request
// if it cannot find any previously partially uploaded object.
uploadID, isNew, err := c.getUploadID(bucketName, objectName, contentType)
if err != nil {
return 0, err
}
// If This session is a continuation of a previous session fetch all
// previously uploaded parts info and as a special case only fetch partsInfo
// for only known upload size.
if !isNew {
// Fetch previously uploaded parts and maximum part size.
partsInfo, err = c.listObjectParts(bucketName, objectName, uploadID)
if err != nil {
return 0, err
}
}
// Calculate the optimal parts info for a given size.
totalPartsCount, partSize, _, err := optimalPartInfo(size)
if err != nil {
return 0, err
}
// Part number always starts with '1'.
partNumber := 1
// Initialize a temporary buffer.
tmpBuffer := new(bytes.Buffer)
for partNumber <= totalPartsCount {
// Choose hash algorithms to be calculated by hashCopyN, avoid sha256
// with non-v4 signature request or HTTPS connection
hashSums := make(map[string][]byte)
hashAlgos := make(map[string]hash.Hash)
hashAlgos["md5"] = md5.New()
if c.signature.isV4() && !c.secure {
hashAlgos["sha256"] = sha256.New()
}
// Calculates hash sums while copying partSize bytes into tmpBuffer.
prtSize, rErr := hashCopyN(hashAlgos, hashSums, tmpBuffer, reader, partSize)
if rErr != nil {
if rErr != io.EOF {
return 0, rErr
}
}
var reader io.Reader
// Update progress reader appropriately to the latest offset
// as we read from the source.
reader = newHook(tmpBuffer, progress)
// Verify if part should be uploaded.
if shouldUploadPart(objectPart{
ETag: hex.EncodeToString(hashSums["md5"]),
PartNumber: partNumber,
Size: prtSize,
}, partsInfo) {
// Proceed to upload the part.
var objPart objectPart
objPart, err = c.uploadPart(bucketName, objectName, uploadID, reader, partNumber, hashSums["md5"], hashSums["sha256"], prtSize)
if err != nil {
// Reset the temporary buffer upon any error.
tmpBuffer.Reset()
return totalUploadedSize, err
}
// Save successfully uploaded part metadata.
partsInfo[partNumber] = objPart
} else {
// Update the progress reader for the skipped part.
if progress != nil {
if _, err = io.CopyN(ioutil.Discard, progress, prtSize); err != nil {
return totalUploadedSize, err
}
}
}
// Reset the temporary buffer.
tmpBuffer.Reset()
// Save successfully uploaded size.
totalUploadedSize += prtSize
// Increment part number.
partNumber++
// For unknown size, Read EOF we break away.
// We do not have to upload till totalPartsCount.
if size < 0 && rErr == io.EOF {
break
}
}
// Verify if we uploaded all the data.
if size > 0 {
if totalUploadedSize != size {
return totalUploadedSize, ErrUnexpectedEOF(totalUploadedSize, size, bucketName, objectName)
}
}
// Loop over total uploaded parts to save them in
// Parts array before completing the multipart request.
for i := 1; i < partNumber; i++ {
part, ok := partsInfo[i]
if !ok {
return 0, ErrInvalidArgument(fmt.Sprintf("Missing part number %d", i))
}
complMultipartUpload.Parts = append(complMultipartUpload.Parts, completePart{
ETag: part.ETag,
PartNumber: part.PartNumber,
})
}
// Sort all completed parts.
sort.Sort(completedParts(complMultipartUpload.Parts))
_, err = c.completeMultipartUpload(bucketName, objectName, uploadID, complMultipartUpload)
if err != nil {
return totalUploadedSize, err
}
// Return final size.
return totalUploadedSize, nil
}
// initiateMultipartUpload - Initiates a multipart upload and returns an upload ID.
func (c Client) initiateMultipartUpload(bucketName, objectName, contentType string) (initiateMultipartUploadResult, error) {
// Input validation.
if err := isValidBucketName(bucketName); err != nil {
return initiateMultipartUploadResult{}, err
}
if err := isValidObjectName(objectName); err != nil {
return initiateMultipartUploadResult{}, err
}
// Initialize url queries.
urlValues := make(url.Values)
urlValues.Set("uploads", "")
if contentType == "" {
contentType = "application/octet-stream"
}
// Set ContentType header.
customHeader := make(http.Header)
customHeader.Set("Content-Type", contentType)
reqMetadata := requestMetadata{
bucketName: bucketName,
objectName: objectName,
queryValues: urlValues,
customHeader: customHeader,
}
// Execute POST on an objectName to initiate multipart upload.
resp, err := c.executeMethod("POST", reqMetadata)
defer closeResponse(resp)
if err != nil {
return initiateMultipartUploadResult{}, err
}
if resp != nil {
if resp.StatusCode != http.StatusOK {
return initiateMultipartUploadResult{}, httpRespToErrorResponse(resp, bucketName, objectName)
}
}
// Decode xml for new multipart upload.
initiateMultipartUploadResult := initiateMultipartUploadResult{}
err = xmlDecoder(resp.Body, &initiateMultipartUploadResult)
if err != nil {
return initiateMultipartUploadResult, err
}
return initiateMultipartUploadResult, nil
}
// uploadPart - Uploads a part in a multipart upload.
func (c Client) uploadPart(bucketName, objectName, uploadID string, reader io.Reader, partNumber int, md5Sum, sha256Sum []byte, size int64) (objectPart, error) {
// Input validation.
if err := isValidBucketName(bucketName); err != nil {
return objectPart{}, err
}
if err := isValidObjectName(objectName); err != nil {
return objectPart{}, err
}
if size > maxPartSize {
return objectPart{}, ErrEntityTooLarge(size, maxPartSize, bucketName, objectName)
}
if size <= -1 {
return objectPart{}, ErrEntityTooSmall(size, bucketName, objectName)
}
if partNumber <= 0 {
return objectPart{}, ErrInvalidArgument("Part number cannot be negative or equal to zero.")
}
if uploadID == "" {
return objectPart{}, ErrInvalidArgument("UploadID cannot be empty.")
}
// Get resources properly escaped and lined up before using them in http request.
urlValues := make(url.Values)
// Set part number.
urlValues.Set("partNumber", strconv.Itoa(partNumber))
// Set upload id.
urlValues.Set("uploadId", uploadID)
reqMetadata := requestMetadata{
bucketName: bucketName,
objectName: objectName,
queryValues: urlValues,
contentBody: reader,
contentLength: size,
contentMD5Bytes: md5Sum,
contentSHA256Bytes: sha256Sum,
}
// Execute PUT on each part.
resp, err := c.executeMethod("PUT", reqMetadata)
defer closeResponse(resp)
if err != nil {
return objectPart{}, err
}
if resp != nil {
if resp.StatusCode != http.StatusOK {
return objectPart{}, httpRespToErrorResponse(resp, bucketName, objectName)
}
}
// Once successfully uploaded, return completed part.
objPart := objectPart{}
objPart.Size = size
objPart.PartNumber = partNumber
// Trim off the odd double quotes from ETag in the beginning and end.
objPart.ETag = strings.TrimPrefix(resp.Header.Get("ETag"), "\"")
objPart.ETag = strings.TrimSuffix(objPart.ETag, "\"")
return objPart, nil
}
// completeMultipartUpload - Completes a multipart upload by assembling previously uploaded parts.
func (c Client) completeMultipartUpload(bucketName, objectName, uploadID string, complete completeMultipartUpload) (completeMultipartUploadResult, error) {
// Input validation.
if err := isValidBucketName(bucketName); err != nil {
return completeMultipartUploadResult{}, err
}
if err := isValidObjectName(objectName); err != nil {
return completeMultipartUploadResult{}, err
}
// Initialize url queries.
urlValues := make(url.Values)
urlValues.Set("uploadId", uploadID)
// Marshal complete multipart body.
completeMultipartUploadBytes, err := xml.Marshal(complete)
if err != nil {
return completeMultipartUploadResult{}, err
}
// Instantiate all the complete multipart buffer.
completeMultipartUploadBuffer := bytes.NewReader(completeMultipartUploadBytes)
reqMetadata := requestMetadata{
bucketName: bucketName,
objectName: objectName,
queryValues: urlValues,
contentBody: completeMultipartUploadBuffer,
contentLength: int64(len(completeMultipartUploadBytes)),
contentSHA256Bytes: sum256(completeMultipartUploadBytes),
}
// Execute POST to complete multipart upload for an objectName.
resp, err := c.executeMethod("POST", reqMetadata)
defer closeResponse(resp)
if err != nil {
return completeMultipartUploadResult{}, err
}
if resp != nil {
if resp.StatusCode != http.StatusOK {
return completeMultipartUploadResult{}, httpRespToErrorResponse(resp, bucketName, objectName)
}
}
// Read resp.Body into a []bytes to parse for Error response inside the body
var b []byte
b, err = ioutil.ReadAll(resp.Body)
if err != nil {
return completeMultipartUploadResult{}, err
}
// Decode completed multipart upload response on success.
completeMultipartUploadResult := completeMultipartUploadResult{}
err = xmlDecoder(bytes.NewReader(b), &completeMultipartUploadResult)
if err != nil {
// xml parsing failure due to presence an ill-formed xml fragment
return completeMultipartUploadResult, err
} else if completeMultipartUploadResult.Bucket == "" {
// xml's Decode method ignores well-formed xml that don't apply to the type of value supplied.
// In this case, it would leave completeMultipartUploadResult with the corresponding zero-values
// of the members.
// Decode completed multipart upload response on failure
completeMultipartUploadErr := ErrorResponse{}
err = xmlDecoder(bytes.NewReader(b), &completeMultipartUploadErr)
if err != nil {
// xml parsing failure due to presence an ill-formed xml fragment
return completeMultipartUploadResult, err
}
return completeMultipartUploadResult, completeMultipartUploadErr
}
return completeMultipartUploadResult, nil
}
|