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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 (
"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(bucket, object, uploadID)
_, err := fs.storage.StatFile(minioMetaMultipartBucket, path.Join(uploadIDPath, fsMetaJSONFile))
if err != nil {
if err == errFileNotFound {
return false
}
errorIf(err, "Unable to access upload id "+pathJoin(minioMetaMultipartBucket, uploadIDPath))
return false
}
return true
}
// updateUploadJSON - add or remove upload ID info in all `uploads.json`.
func (fs fsObjects) updateUploadJSON(bucket, object, uploadID string, initiated time.Time, isRemove bool) error {
uploadsPath := path.Join(bucket, object, uploadsJSONFile)
tmpUploadsPath := mustGetUUID()
uploadsJSON, err := readUploadsJSON(bucket, object, fs.storage)
if errorCause(err) == errFileNotFound {
// If file is not found, we assume a default (empty)
// upload info.
uploadsJSON, err = newUploadsV1("fs"), nil
}
if err != nil {
return err
}
// update the uploadsJSON struct
if !isRemove {
// Add the uploadID
uploadsJSON.AddUploadID(uploadID, initiated)
} else {
// Remove the upload ID
uploadsJSON.RemoveUploadID(uploadID)
}
// update the file or delete it?
if len(uploadsJSON.Uploads) > 0 {
err = writeUploadJSON(&uploadsJSON, uploadsPath, tmpUploadsPath, fs.storage)
} else {
// no uploads, so we delete the file.
if err = fs.storage.DeleteFile(minioMetaMultipartBucket, uploadsPath); err != nil {
return toObjectErr(traceError(err), minioMetaMultipartBucket, uploadsPath)
}
}
return err
}
// addUploadID - add upload ID and its initiated time to 'uploads.json'.
func (fs fsObjects) addUploadID(bucket, object string, uploadID string, initiated time.Time) error {
return fs.updateUploadJSON(bucket, object, uploadID, initiated, false)
}
// removeUploadID - remove upload ID in 'uploads.json'.
func (fs fsObjects) removeUploadID(bucket, object string, uploadID string) error {
return fs.updateUploadJSON(bucket, object, uploadID, time.Time{}, true)
}