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minio/xl-objects-multipart.go

171 lines
5.4 KiB

/*
* Minio Cloud Storage, (C) 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 main
import (
"encoding/json"
"fmt"
"io"
"path"
"time"
)
// MultipartPartInfo Info of each part kept in the multipart metadata file after
// CompleteMultipartUpload() is called.
type MultipartPartInfo struct {
PartNumber int
ETag string
Size int64
}
// MultipartObjectInfo - contents of the multipart metadata file after
// CompleteMultipartUpload() is called.
type MultipartObjectInfo struct {
Parts []MultipartPartInfo
ModTime time.Time
Size int64
MD5Sum string
}
// GetPartNumberOffset - given an offset for the whole object, return the part and offset in that part.
func (m MultipartObjectInfo) GetPartNumberOffset(offset int64) (partIndex int, partOffset int64, err error) {
partOffset = offset
for i, part := range m.Parts {
partIndex = i
if partOffset < part.Size {
return
}
partOffset -= part.Size
}
// Offset beyond the size of the object
err = errUnexpected
return
}
func partNumToPartFileName(partNum int) string {
return fmt.Sprintf("%.5d%s", partNum, multipartSuffix)
}
// ListMultipartUploads - list multipart uploads.
func (xl xlObjects) ListMultipartUploads(bucket, prefix, keyMarker, uploadIDMarker, delimiter string, maxUploads int) (ListMultipartsInfo, error) {
return listMultipartUploadsCommon(xl.storage, bucket, prefix, keyMarker, uploadIDMarker, delimiter, maxUploads)
}
// NewMultipartUpload - initialize a new multipart upload, returns a unique id.
func (xl xlObjects) NewMultipartUpload(bucket, object string) (string, error) {
return newMultipartUploadCommon(xl.storage, bucket, object)
}
// PutObjectPart - writes the multipart upload chunks.
func (xl xlObjects) PutObjectPart(bucket, object, uploadID string, partID int, size int64, data io.Reader, md5Hex string) (string, error) {
return putObjectPartCommon(xl.storage, bucket, object, uploadID, partID, size, data, md5Hex)
}
// ListObjectParts - list object parts.
func (xl xlObjects) ListObjectParts(bucket, object, uploadID string, partNumberMarker, maxParts int) (ListPartsInfo, error) {
return listObjectPartsCommon(xl.storage, bucket, object, uploadID, partNumberMarker, maxParts)
}
func (xl xlObjects) CompleteMultipartUpload(bucket string, object string, uploadID string, parts []completePart) (string, error) {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return "", BucketNameInvalid{Bucket: bucket}
}
if !IsValidObjectName(object) {
return "", ObjectNameInvalid{
Bucket: bucket,
Object: object,
}
}
if status, err := isUploadIDExists(xl.storage, bucket, object, uploadID); err != nil {
return "", err
} else if !status {
return "", InvalidUploadID{UploadID: uploadID}
}
var metadata = MultipartObjectInfo{}
var md5Sums []string
for _, part := range parts {
// Construct part suffix.
partSuffix := fmt.Sprintf("%s.%.5d.%s", uploadID, part.PartNumber, part.ETag)
multipartPartFile := path.Join(mpartMetaPrefix, bucket, object, partSuffix)
fi, err := xl.storage.StatFile(minioMetaBucket, multipartPartFile)
if err != nil {
if err == errFileNotFound {
return "", InvalidPart{}
}
return "", err
}
// Update metadata parts.
metadata.Parts = append(metadata.Parts, MultipartPartInfo{
PartNumber: part.PartNumber,
ETag: part.ETag,
Size: fi.Size,
})
metadata.Size += fi.Size
multipartObjSuffix := path.Join(object, partNumToPartFileName(part.PartNumber))
err = xl.storage.RenameFile(minioMetaBucket, multipartPartFile, bucket, multipartObjSuffix)
// TODO: We need a way to roll back if of the renames failed.
if err != nil {
return "", err
}
// Save md5sum for future response.
md5Sums = append(md5Sums, part.ETag)
}
// Calculate and save s3 compatible md5sum.
s3MD5, err := makeS3MD5(md5Sums...)
if err != nil {
return "", err
}
metadata.MD5Sum = s3MD5
// Save modTime as well as the current time.
metadata.ModTime = time.Now().UTC()
// Create temporary multipart meta file to write and then rename.
tempMultipartMetaFile := path.Join(tmpMetaPrefix, bucket, object, multipartMetaFile)
w, err := xl.storage.CreateFile(minioMetaBucket, tempMultipartMetaFile)
if err != nil {
return "", toObjectErr(err, bucket, object)
}
encoder := json.NewEncoder(w)
err = encoder.Encode(&metadata)
if err != nil {
if err = safeCloseAndRemove(w); err != nil {
return "", err
}
return "", err
}
// Close the writer.
if err = w.Close(); err != nil {
return "", err
}
multipartObjFile := path.Join(object, multipartMetaFile)
err = xl.storage.RenameFile(minioMetaBucket, tempMultipartMetaFile, bucket, multipartObjFile)
if err != nil {
return "", toObjectErr(err, bucket, multipartObjFile)
}
// Return md5sum.
return s3MD5, nil
}
// AbortMultipartUpload - aborts a multipart upload.
func (xl xlObjects) AbortMultipartUpload(bucket, object, uploadID string) error {
return abortMultipartUploadCommon(xl.storage, bucket, object, uploadID)
}