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minio/cmd/fs-v1-multipart-common.go

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/*
* 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 cmd
import (
"encoding/json"
"path"
"time"
)
// Returns if the prefix is a multipart upload.
func (fs fsObjects) isMultipartUpload(bucket, prefix string) bool {
_, err := fs.storage.StatFile(bucket, pathJoin(prefix, uploadsJSONFile))
return err == nil
}
// Checks whether bucket exists.
func (fs fsObjects) isBucketExist(bucket string) bool {
// Check whether bucket exists.
_, err := fs.storage.StatVol(bucket)
if err != nil {
if err == errVolumeNotFound {
return false
}
errorIf(err, "Stat failed on bucket "+bucket+".")
return false
}
return true
}
// isUploadIDExists - verify if a given uploadID exists and is valid.
func (fs fsObjects) isUploadIDExists(bucket, object, uploadID string) bool {
uploadIDPath := path.Join(mpartMetaPrefix, bucket, object, uploadID)
_, err := fs.storage.StatFile(minioMetaBucket, path.Join(uploadIDPath, fsMetaJSONFile))
if err != nil {
if err == errFileNotFound {
return false
}
errorIf(err, "Unable to access upload id"+uploadIDPath)
return false
}
return true
}
// writeUploadJSON - create `uploads.json` or update it with new uploadID.
func (fs fsObjects) writeUploadJSON(bucket, object, uploadID string, initiated time.Time) (err error) {
uploadsPath := path.Join(mpartMetaPrefix, bucket, object, uploadsJSONFile)
uniqueID := getUUID()
tmpUploadsPath := path.Join(tmpMetaPrefix, uniqueID)
var uploadsJSON uploadsV1
uploadsJSON, err = readUploadsJSON(bucket, object, fs.storage)
if err != nil {
// For any other errors.
if err != errFileNotFound {
return err
}
// Set uploads format to `fs`.
uploadsJSON = newUploadsV1("fs")
}
// Add a new upload id.
uploadsJSON.AddUploadID(uploadID, initiated)
// Update `uploads.json` on all disks.
uploadsJSONBytes, wErr := json.Marshal(&uploadsJSON)
if wErr != nil {
return wErr
}
// Write `uploads.json` to disk.
if wErr = fs.storage.AppendFile(minioMetaBucket, tmpUploadsPath, uploadsJSONBytes); wErr != nil {
return wErr
}
wErr = fs.storage.RenameFile(minioMetaBucket, tmpUploadsPath, minioMetaBucket, uploadsPath)
if wErr != nil {
if dErr := fs.storage.DeleteFile(minioMetaBucket, tmpUploadsPath); dErr != nil {
return dErr
}
return wErr
}
return nil
}
// updateUploadsJSON - update `uploads.json` with new uploadsJSON for all disks.
func (fs fsObjects) updateUploadsJSON(bucket, object string, uploadsJSON uploadsV1) (err error) {
uploadsPath := path.Join(mpartMetaPrefix, bucket, object, uploadsJSONFile)
uniqueID := getUUID()
tmpUploadsPath := path.Join(tmpMetaPrefix, uniqueID)
uploadsBytes, wErr := json.Marshal(uploadsJSON)
if wErr != nil {
return wErr
}
if wErr = fs.storage.AppendFile(minioMetaBucket, tmpUploadsPath, uploadsBytes); wErr != nil {
return wErr
}
if wErr = fs.storage.RenameFile(minioMetaBucket, tmpUploadsPath, minioMetaBucket, uploadsPath); wErr != nil {
return wErr
}
return nil
}