mirror of
https://github.com/octoleo/restic.git
synced 2024-12-12 06:07:55 +00:00
119 lines
3.5 KiB
Go
119 lines
3.5 KiB
Go
/*
|
|
* Minio Go Library for Amazon S3 Compatible Cloud Storage (C) 2015 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 (
|
|
"hash"
|
|
"io"
|
|
"math"
|
|
"os"
|
|
|
|
"github.com/minio/minio-go/pkg/s3utils"
|
|
)
|
|
|
|
// Verify if reader is *os.File
|
|
func isFile(reader io.Reader) (ok bool) {
|
|
_, ok = reader.(*os.File)
|
|
return
|
|
}
|
|
|
|
// Verify if reader is *minio.Object
|
|
func isObject(reader io.Reader) (ok bool) {
|
|
_, ok = reader.(*Object)
|
|
return
|
|
}
|
|
|
|
// Verify if reader is a generic ReaderAt
|
|
func isReadAt(reader io.Reader) (ok bool) {
|
|
_, ok = reader.(io.ReaderAt)
|
|
return
|
|
}
|
|
|
|
// optimalPartInfo - calculate the optimal part info for a given
|
|
// object size.
|
|
//
|
|
// NOTE: Assumption here is that for any object to be uploaded to any S3 compatible
|
|
// object storage it will have the following parameters as constants.
|
|
//
|
|
// maxPartsCount - 10000
|
|
// minPartSize - 64MiB
|
|
// maxMultipartPutObjectSize - 5TiB
|
|
//
|
|
func optimalPartInfo(objectSize int64) (totalPartsCount int, partSize int64, lastPartSize int64, err error) {
|
|
// object size is '-1' set it to 5TiB.
|
|
if objectSize == -1 {
|
|
objectSize = maxMultipartPutObjectSize
|
|
}
|
|
// object size is larger than supported maximum.
|
|
if objectSize > maxMultipartPutObjectSize {
|
|
err = ErrEntityTooLarge(objectSize, maxMultipartPutObjectSize, "", "")
|
|
return
|
|
}
|
|
// Use floats for part size for all calculations to avoid
|
|
// overflows during float64 to int64 conversions.
|
|
partSizeFlt := math.Ceil(float64(objectSize / maxPartsCount))
|
|
partSizeFlt = math.Ceil(partSizeFlt/minPartSize) * minPartSize
|
|
// Total parts count.
|
|
totalPartsCount = int(math.Ceil(float64(objectSize) / partSizeFlt))
|
|
// Part size.
|
|
partSize = int64(partSizeFlt)
|
|
// Last part size.
|
|
lastPartSize = objectSize - int64(totalPartsCount-1)*partSize
|
|
return totalPartsCount, partSize, lastPartSize, nil
|
|
}
|
|
|
|
// hashCopyN - Calculates chosen hashes up to partSize amount of bytes.
|
|
func hashCopyN(hashAlgorithms map[string]hash.Hash, hashSums map[string][]byte, writer io.Writer, reader io.Reader, partSize int64) (size int64, err error) {
|
|
hashWriter := writer
|
|
for _, v := range hashAlgorithms {
|
|
hashWriter = io.MultiWriter(hashWriter, v)
|
|
}
|
|
|
|
// Copies to input at writer.
|
|
size, err = io.CopyN(hashWriter, reader, partSize)
|
|
if err != nil {
|
|
// If not EOF return error right here.
|
|
if err != io.EOF {
|
|
return 0, err
|
|
}
|
|
}
|
|
|
|
for k, v := range hashAlgorithms {
|
|
hashSums[k] = v.Sum(nil)
|
|
}
|
|
return size, err
|
|
}
|
|
|
|
// getUploadID - fetch upload id if already present for an object name
|
|
// or initiate a new request to fetch a new upload id.
|
|
func (c Client) newUploadID(bucketName, objectName string, metaData map[string][]string) (uploadID string, err error) {
|
|
// Input validation.
|
|
if err := s3utils.CheckValidBucketName(bucketName); err != nil {
|
|
return "", err
|
|
}
|
|
if err := s3utils.CheckValidObjectName(objectName); err != nil {
|
|
return "", err
|
|
}
|
|
|
|
// Initiate multipart upload for an object.
|
|
initMultipartUploadResult, err := c.initiateMultipartUpload(bucketName, objectName, metaData)
|
|
if err != nil {
|
|
return "", err
|
|
}
|
|
return initMultipartUploadResult.UploadID, nil
|
|
}
|