minio/cmd/object-api-multipart-common.go

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/*
* Minio Cloud Storage, (C) 2016, 2017 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 cmd
import (
"encoding/json"
"io"
"io/ioutil"
"path"
"sort"
"time"
"github.com/minio/minio/pkg/errors"
"github.com/minio/minio/pkg/lock"
)
// A uploadInfo represents the s3 compatible spec.
type uploadInfo struct {
UploadID string `json:"uploadId"` // UploadID for the active multipart upload.
Deleted bool `json:"deleted"` // Currently unused, for future use.
Initiated time.Time `json:"initiated"` // Indicates when the uploadID was initiated.
}
// A uploadsV1 represents `uploads.json` metadata header.
type uploadsV1 struct {
Version string `json:"version"` // Version of the current `uploads.json`
Format string `json:"format"` // Format of the current `uploads.json`
Uploads []uploadInfo `json:"uploadIds"` // Captures all the upload ids for a given object.
}
// byInitiatedTime is a collection satisfying sort.Interface.
type byInitiatedTime []uploadInfo
func (t byInitiatedTime) Len() int { return len(t) }
func (t byInitiatedTime) Swap(i, j int) { t[i], t[j] = t[j], t[i] }
func (t byInitiatedTime) Less(i, j int) bool {
return t[i].Initiated.Before(t[j].Initiated)
}
// AddUploadID - adds a new upload id in order of its initiated time.
func (u *uploadsV1) AddUploadID(uploadID string, initiated time.Time) {
u.Uploads = append(u.Uploads, uploadInfo{
UploadID: uploadID,
Initiated: initiated,
})
sort.Sort(byInitiatedTime(u.Uploads))
}
// RemoveUploadID - removes upload id from uploads metadata.
func (u *uploadsV1) RemoveUploadID(uploadID string) {
// If the uploadID is absent, we do nothing.
for i, uInfo := range u.Uploads {
if uInfo.UploadID == uploadID {
u.Uploads = append(u.Uploads[:i], u.Uploads[i+1:]...)
break
}
}
}
// IsEmpty - is true if no more uploads available.
func (u *uploadsV1) IsEmpty() bool {
return len(u.Uploads) == 0
}
func (u *uploadsV1) WriteTo(lk *lock.LockedFile) (n int64, err error) {
// Serialize to prepare to write to disk.
var uplBytes []byte
uplBytes, err = json.Marshal(u)
if err != nil {
return 0, errors.Trace(err)
}
if err = lk.Truncate(0); err != nil {
return 0, errors.Trace(err)
}
_, err = lk.Write(uplBytes)
if err != nil {
return 0, errors.Trace(err)
}
return int64(len(uplBytes)), nil
}
func (u *uploadsV1) ReadFrom(lk *lock.LockedFile) (n int64, err error) {
var uploadIDBytes []byte
fi, err := lk.Stat()
if err != nil {
return 0, errors.Trace(err)
}
uploadIDBytes, err = ioutil.ReadAll(io.NewSectionReader(lk, 0, fi.Size()))
if err != nil {
return 0, errors.Trace(err)
}
if len(uploadIDBytes) == 0 {
return 0, errors.Trace(io.EOF)
}
// Decode `uploads.json`.
if err = json.Unmarshal(uploadIDBytes, u); err != nil {
return 0, errors.Trace(err)
}
return int64(len(uploadIDBytes)), nil
}
// readUploadsJSON - get all the saved uploads JSON.
func readUploadsJSON(bucket, object string, disk StorageAPI) (uploadIDs uploadsV1, err error) {
uploadJSONPath := path.Join(bucket, object, uploadsJSONFile)
// Reads entire `uploads.json`.
buf, err := disk.ReadAll(minioMetaMultipartBucket, uploadJSONPath)
if err != nil {
return uploadsV1{}, errors.Trace(err)
}
// Decode `uploads.json`.
if err = json.Unmarshal(buf, &uploadIDs); err != nil {
return uploadsV1{}, errors.Trace(err)
}
// Success.
return uploadIDs, nil
}
// newUploadsV1 - initialize new uploads v1.
func newUploadsV1(format string) uploadsV1 {
uploadIDs := uploadsV1{}
uploadIDs.Version = "1.0.0" // Should follow semantic versioning.
uploadIDs.Format = format
return uploadIDs
}
func writeUploadJSON(u *uploadsV1, uploadsPath, tmpPath string, disk StorageAPI) error {
// Serialize to prepare to write to disk.
uplBytes, wErr := json.Marshal(&u)
if wErr != nil {
return errors.Trace(wErr)
}
// Write `uploads.json` to disk. First to tmp location and then rename.
if wErr = disk.AppendFile(minioMetaTmpBucket, tmpPath, uplBytes); wErr != nil {
return errors.Trace(wErr)
}
wErr = disk.RenameFile(minioMetaTmpBucket, tmpPath, minioMetaMultipartBucket, uploadsPath)
if wErr != nil {
if dErr := disk.DeleteFile(minioMetaTmpBucket, tmpPath); dErr != nil {
// we return the most recent error.
return errors.Trace(dErr)
}
return errors.Trace(wErr)
}
return nil
}
// listMultipartUploadIDs - list all the upload ids from a marker up to 'count'.
func listMultipartUploadIDs(bucketName, objectName, uploadIDMarker string, count int, disk StorageAPI) ([]MultipartInfo, bool, error) {
var uploads []MultipartInfo
// Read `uploads.json`.
uploadsJSON, err := readUploadsJSON(bucketName, objectName, disk)
if err != nil {
return nil, false, err
}
index := 0
if uploadIDMarker != "" {
for ; index < len(uploadsJSON.Uploads); index++ {
if uploadsJSON.Uploads[index].UploadID == uploadIDMarker {
// Skip the uploadID as it would already be listed in previous listing.
index++
break
}
}
}
for index < len(uploadsJSON.Uploads) {
uploads = append(uploads, MultipartInfo{
Object: objectName,
UploadID: uploadsJSON.Uploads[index].UploadID,
Initiated: uploadsJSON.Uploads[index].Initiated,
})
count--
index++
if count == 0 {
break
}
}
end := (index == len(uploadsJSON.Uploads))
return uploads, end, nil
}