mirror of
https://github.com/octoleo/restic.git
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119 lines
3.5 KiB
Go
119 lines
3.5 KiB
Go
/*
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* Minio Go Library for Amazon S3 Compatible Cloud Storage (C) 2015 Minio, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package minio
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import (
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"hash"
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"io"
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"math"
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"os"
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"github.com/minio/minio-go/pkg/s3utils"
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)
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// Verify if reader is *os.File
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func isFile(reader io.Reader) (ok bool) {
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_, ok = reader.(*os.File)
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return
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}
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// Verify if reader is *minio.Object
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func isObject(reader io.Reader) (ok bool) {
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_, ok = reader.(*Object)
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return
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}
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// Verify if reader is a generic ReaderAt
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func isReadAt(reader io.Reader) (ok bool) {
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_, ok = reader.(io.ReaderAt)
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return
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}
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// optimalPartInfo - calculate the optimal part info for a given
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// object size.
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//
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// NOTE: Assumption here is that for any object to be uploaded to any S3 compatible
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// object storage it will have the following parameters as constants.
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//
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// maxPartsCount - 10000
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// minPartSize - 64MiB
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// maxMultipartPutObjectSize - 5TiB
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//
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func optimalPartInfo(objectSize int64) (totalPartsCount int, partSize int64, lastPartSize int64, err error) {
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// object size is '-1' set it to 5TiB.
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if objectSize == -1 {
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objectSize = maxMultipartPutObjectSize
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}
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// object size is larger than supported maximum.
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if objectSize > maxMultipartPutObjectSize {
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err = ErrEntityTooLarge(objectSize, maxMultipartPutObjectSize, "", "")
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return
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}
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// Use floats for part size for all calculations to avoid
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// overflows during float64 to int64 conversions.
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partSizeFlt := math.Ceil(float64(objectSize / maxPartsCount))
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partSizeFlt = math.Ceil(partSizeFlt/minPartSize) * minPartSize
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// Total parts count.
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totalPartsCount = int(math.Ceil(float64(objectSize) / partSizeFlt))
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// Part size.
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partSize = int64(partSizeFlt)
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// Last part size.
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lastPartSize = objectSize - int64(totalPartsCount-1)*partSize
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return totalPartsCount, partSize, lastPartSize, nil
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}
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// hashCopyN - Calculates chosen hashes up to partSize amount of bytes.
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func hashCopyN(hashAlgorithms map[string]hash.Hash, hashSums map[string][]byte, writer io.Writer, reader io.Reader, partSize int64) (size int64, err error) {
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hashWriter := writer
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for _, v := range hashAlgorithms {
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hashWriter = io.MultiWriter(hashWriter, v)
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}
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// Copies to input at writer.
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size, err = io.CopyN(hashWriter, reader, partSize)
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if err != nil {
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// If not EOF return error right here.
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if err != io.EOF {
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return 0, err
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}
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}
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for k, v := range hashAlgorithms {
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hashSums[k] = v.Sum(nil)
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}
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return size, err
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}
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// getUploadID - fetch upload id if already present for an object name
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// or initiate a new request to fetch a new upload id.
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func (c Client) newUploadID(bucketName, objectName string, metaData map[string][]string) (uploadID string, err error) {
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// Input validation.
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if err := s3utils.CheckValidBucketName(bucketName); err != nil {
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return "", err
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}
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if err := s3utils.CheckValidObjectName(objectName); err != nil {
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return "", err
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}
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// Initiate multipart upload for an object.
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initMultipartUploadResult, err := c.initiateMultipartUpload(bucketName, objectName, metaData)
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if err != nil {
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return "", err
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}
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return initMultipartUploadResult.UploadID, nil
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}
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