252 lines
7.3 KiB
Go
252 lines
7.3 KiB
Go
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/*
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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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"fmt"
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"hash"
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"io"
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"io/ioutil"
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"math"
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"os"
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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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// shouldUploadPart - verify if part should be uploaded.
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func shouldUploadPart(objPart ObjectPart, uploadReq uploadPartReq) bool {
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// If part not found should upload the part.
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if uploadReq.Part == nil {
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return true
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}
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// if size mismatches should upload the part.
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if objPart.Size != uploadReq.Part.Size {
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return true
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}
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// if md5sum mismatches should upload the part.
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if objPart.ETag != uploadReq.Part.ETag {
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return true
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}
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return false
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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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// hashCopyBuffer is identical to hashCopyN except that it doesn't take
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// any size argument but takes a buffer argument and reader should be
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// of io.ReaderAt interface.
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//
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// Stages reads from offsets into the buffer, if buffer is nil it is
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// initialized to optimalBufferSize.
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func hashCopyBuffer(hashAlgorithms map[string]hash.Hash, hashSums map[string][]byte, writer io.Writer, reader io.ReaderAt, buf []byte) (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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// Buffer is nil, initialize.
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if buf == nil {
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buf = make([]byte, optimalReadBufferSize)
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}
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// Offset to start reading from.
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var readAtOffset int64
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// Following block reads data at an offset from the input
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// reader and copies data to into local temporary file.
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for {
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readAtSize, rerr := reader.ReadAt(buf, readAtOffset)
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if rerr != nil {
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if rerr != io.EOF {
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return 0, rerr
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}
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}
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writeSize, werr := hashWriter.Write(buf[:readAtSize])
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if werr != nil {
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return 0, werr
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}
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if readAtSize != writeSize {
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return 0, fmt.Errorf("Read size was not completely written to writer. wanted %d, got %d - %s", readAtSize, writeSize, reportIssue)
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}
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readAtOffset += int64(writeSize)
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size += int64(writeSize)
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if rerr == io.EOF {
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break
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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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// 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 := isValidBucketName(bucketName); err != nil {
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return "", err
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}
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if err := isValidObjectName(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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// getMpartUploadSession returns the upload id and the uploaded parts to continue a previous upload session
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// or initiate a new multipart session if no current one found
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func (c Client) getMpartUploadSession(bucketName, objectName string, metaData map[string][]string) (string, map[int]ObjectPart, error) {
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// A map of all uploaded parts.
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var partsInfo map[int]ObjectPart
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var err error
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uploadID, err := c.findUploadID(bucketName, objectName)
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if err != nil {
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return "", nil, err
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}
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if uploadID == "" {
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// Initiates a new multipart request
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uploadID, err = c.newUploadID(bucketName, objectName, metaData)
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if err != nil {
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return "", nil, err
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}
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} else {
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// Fetch previously upload parts and maximum part size.
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partsInfo, err = c.listObjectParts(bucketName, objectName, uploadID)
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if err != nil {
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// When the server returns NoSuchUpload even if its previouls acknowleged the existance of the upload id,
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// initiate a new multipart upload
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if respErr, ok := err.(ErrorResponse); ok && respErr.Code == "NoSuchUpload" {
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uploadID, err = c.newUploadID(bucketName, objectName, metaData)
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if err != nil {
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return "", nil, err
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}
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} else {
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return "", nil, err
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}
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}
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}
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// Allocate partsInfo if not done yet
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if partsInfo == nil {
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partsInfo = make(map[int]ObjectPart)
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}
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return uploadID, partsInfo, nil
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}
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// computeHash - Calculates hashes for an input read Seeker.
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func computeHash(hashAlgorithms map[string]hash.Hash, hashSums map[string][]byte, reader io.ReadSeeker) (size int64, err error) {
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hashWriter := ioutil.Discard
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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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// If no buffer is provided, no need to allocate just use io.Copy.
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size, err = io.Copy(hashWriter, reader)
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if err != nil {
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return 0, err
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}
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// Seek back reader to the beginning location.
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if _, err := reader.Seek(0, 0); err != nil {
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return 0, err
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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, nil
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}
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