mirror of
https://github.com/octoleo/restic.git
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373 lines
12 KiB
Go
373 lines
12 KiB
Go
/*
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* Minio Go Library for Amazon S3 Compatible Cloud Storage (C) 2015, 2016 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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"bytes"
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"encoding/xml"
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"fmt"
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"io"
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"io/ioutil"
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"net/http"
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"net/url"
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"sort"
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"strconv"
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"strings"
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"github.com/minio/minio-go/pkg/s3utils"
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)
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func (c Client) putObjectMultipart(bucketName, objectName string, reader io.Reader, size int64,
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metadata map[string][]string, progress io.Reader) (n int64, err error) {
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n, err = c.putObjectMultipartNoStream(bucketName, objectName, reader, size, metadata, progress)
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if err != nil {
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errResp := ToErrorResponse(err)
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// Verify if multipart functionality is not available, if not
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// fall back to single PutObject operation.
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if errResp.Code == "AccessDenied" && strings.Contains(errResp.Message, "Access Denied") {
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// Verify if size of reader is greater than '5GiB'.
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if size > maxSinglePutObjectSize {
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return 0, ErrEntityTooLarge(size, maxSinglePutObjectSize, bucketName, objectName)
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}
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// Fall back to uploading as single PutObject operation.
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return c.putObjectNoChecksum(bucketName, objectName, reader, size, metadata, progress)
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}
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}
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return n, err
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}
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func (c Client) putObjectMultipartNoStream(bucketName, objectName string, reader io.Reader, size int64,
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metadata map[string][]string, progress io.Reader) (n int64, err error) {
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// Input validation.
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if err = s3utils.CheckValidBucketName(bucketName); err != nil {
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return 0, err
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}
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if err = s3utils.CheckValidObjectName(objectName); err != nil {
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return 0, err
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}
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// Total data read and written to server. should be equal to
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// 'size' at the end of the call.
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var totalUploadedSize int64
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// Complete multipart upload.
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var complMultipartUpload completeMultipartUpload
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// Calculate the optimal parts info for a given size.
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totalPartsCount, partSize, _, err := optimalPartInfo(size)
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if err != nil {
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return 0, err
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}
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// Initiate a new multipart upload.
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uploadID, err := c.newUploadID(bucketName, objectName, metadata)
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if err != nil {
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return 0, err
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}
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defer func() {
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if err != nil {
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c.abortMultipartUpload(bucketName, objectName, uploadID)
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}
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}()
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// Part number always starts with '1'.
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partNumber := 1
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// Initialize a temporary buffer.
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tmpBuffer := new(bytes.Buffer)
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// Initialize parts uploaded map.
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partsInfo := make(map[int]ObjectPart)
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for partNumber <= totalPartsCount {
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// Choose hash algorithms to be calculated by hashCopyN,
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// avoid sha256 with non-v4 signature request or
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// HTTPS connection.
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hashAlgos, hashSums := c.hashMaterials()
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// Calculates hash sums while copying partSize bytes into tmpBuffer.
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prtSize, rErr := hashCopyN(hashAlgos, hashSums, tmpBuffer, reader, partSize)
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if rErr != nil && rErr != io.EOF {
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return 0, rErr
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}
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var reader io.Reader
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// Update progress reader appropriately to the latest offset
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// as we read from the source.
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reader = newHook(tmpBuffer, progress)
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// Proceed to upload the part.
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var objPart ObjectPart
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objPart, err = c.uploadPart(bucketName, objectName, uploadID, reader, partNumber,
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hashSums["md5"], hashSums["sha256"], prtSize, metadata)
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if err != nil {
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// Reset the temporary buffer upon any error.
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tmpBuffer.Reset()
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return totalUploadedSize, err
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}
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// Save successfully uploaded part metadata.
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partsInfo[partNumber] = objPart
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// Reset the temporary buffer.
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tmpBuffer.Reset()
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// Save successfully uploaded size.
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totalUploadedSize += prtSize
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// Increment part number.
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partNumber++
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// For unknown size, Read EOF we break away.
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// We do not have to upload till totalPartsCount.
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if size < 0 && rErr == io.EOF {
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break
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}
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}
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// Verify if we uploaded all the data.
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if size > 0 {
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if totalUploadedSize != size {
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return totalUploadedSize, ErrUnexpectedEOF(totalUploadedSize, size, bucketName, objectName)
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}
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}
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// Loop over total uploaded parts to save them in
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// Parts array before completing the multipart request.
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for i := 1; i < partNumber; i++ {
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part, ok := partsInfo[i]
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if !ok {
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return 0, ErrInvalidArgument(fmt.Sprintf("Missing part number %d", i))
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}
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complMultipartUpload.Parts = append(complMultipartUpload.Parts, CompletePart{
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ETag: part.ETag,
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PartNumber: part.PartNumber,
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})
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}
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// Sort all completed parts.
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sort.Sort(completedParts(complMultipartUpload.Parts))
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if _, err = c.completeMultipartUpload(bucketName, objectName, uploadID, complMultipartUpload); err != nil {
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return totalUploadedSize, err
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}
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// Return final size.
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return totalUploadedSize, nil
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}
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// initiateMultipartUpload - Initiates a multipart upload and returns an upload ID.
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func (c Client) initiateMultipartUpload(bucketName, objectName string, metadata map[string][]string) (initiateMultipartUploadResult, error) {
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// Input validation.
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if err := s3utils.CheckValidBucketName(bucketName); err != nil {
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return initiateMultipartUploadResult{}, err
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}
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if err := s3utils.CheckValidObjectName(objectName); err != nil {
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return initiateMultipartUploadResult{}, err
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}
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// Initialize url queries.
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urlValues := make(url.Values)
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urlValues.Set("uploads", "")
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// Set ContentType header.
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customHeader := make(http.Header)
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for k, v := range metadata {
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if len(v) > 0 {
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customHeader.Set(k, v[0])
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}
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}
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// Set a default content-type header if the latter is not provided
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if v, ok := metadata["Content-Type"]; !ok || len(v) == 0 {
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customHeader.Set("Content-Type", "application/octet-stream")
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}
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reqMetadata := requestMetadata{
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bucketName: bucketName,
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objectName: objectName,
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queryValues: urlValues,
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customHeader: customHeader,
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}
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// Execute POST on an objectName to initiate multipart upload.
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resp, err := c.executeMethod("POST", reqMetadata)
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defer closeResponse(resp)
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if err != nil {
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return initiateMultipartUploadResult{}, err
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}
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if resp != nil {
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if resp.StatusCode != http.StatusOK {
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return initiateMultipartUploadResult{}, httpRespToErrorResponse(resp, bucketName, objectName)
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}
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}
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// Decode xml for new multipart upload.
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initiateMultipartUploadResult := initiateMultipartUploadResult{}
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err = xmlDecoder(resp.Body, &initiateMultipartUploadResult)
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if err != nil {
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return initiateMultipartUploadResult, err
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}
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return initiateMultipartUploadResult, nil
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}
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const serverEncryptionKeyPrefix = "x-amz-server-side-encryption"
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// uploadPart - Uploads a part in a multipart upload.
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func (c Client) uploadPart(bucketName, objectName, uploadID string, reader io.Reader,
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partNumber int, md5Sum, sha256Sum []byte, size int64, metadata map[string][]string) (ObjectPart, error) {
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// Input validation.
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if err := s3utils.CheckValidBucketName(bucketName); err != nil {
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return ObjectPart{}, err
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}
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if err := s3utils.CheckValidObjectName(objectName); err != nil {
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return ObjectPart{}, err
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}
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if size > maxPartSize {
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return ObjectPart{}, ErrEntityTooLarge(size, maxPartSize, bucketName, objectName)
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}
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if size <= -1 {
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return ObjectPart{}, ErrEntityTooSmall(size, bucketName, objectName)
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}
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if partNumber <= 0 {
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return ObjectPart{}, ErrInvalidArgument("Part number cannot be negative or equal to zero.")
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}
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if uploadID == "" {
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return ObjectPart{}, ErrInvalidArgument("UploadID cannot be empty.")
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}
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// Get resources properly escaped and lined up before using them in http request.
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urlValues := make(url.Values)
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// Set part number.
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urlValues.Set("partNumber", strconv.Itoa(partNumber))
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// Set upload id.
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urlValues.Set("uploadId", uploadID)
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// Set encryption headers, if any.
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customHeader := make(http.Header)
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for k, v := range metadata {
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if len(v) > 0 {
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if strings.HasPrefix(strings.ToLower(k), serverEncryptionKeyPrefix) {
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customHeader.Set(k, v[0])
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}
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}
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}
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reqMetadata := requestMetadata{
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bucketName: bucketName,
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objectName: objectName,
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queryValues: urlValues,
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customHeader: customHeader,
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contentBody: reader,
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contentLength: size,
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contentMD5Bytes: md5Sum,
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contentSHA256Bytes: sha256Sum,
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}
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// Execute PUT on each part.
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resp, err := c.executeMethod("PUT", reqMetadata)
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defer closeResponse(resp)
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if err != nil {
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return ObjectPart{}, err
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}
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if resp != nil {
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if resp.StatusCode != http.StatusOK {
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return ObjectPart{}, httpRespToErrorResponse(resp, bucketName, objectName)
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}
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}
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// Once successfully uploaded, return completed part.
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objPart := ObjectPart{}
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objPart.Size = size
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objPart.PartNumber = partNumber
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// Trim off the odd double quotes from ETag in the beginning and end.
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objPart.ETag = strings.TrimPrefix(resp.Header.Get("ETag"), "\"")
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objPart.ETag = strings.TrimSuffix(objPart.ETag, "\"")
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return objPart, nil
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}
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// completeMultipartUpload - Completes a multipart upload by assembling previously uploaded parts.
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func (c Client) completeMultipartUpload(bucketName, objectName, uploadID string,
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complete completeMultipartUpload) (completeMultipartUploadResult, error) {
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// Input validation.
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if err := s3utils.CheckValidBucketName(bucketName); err != nil {
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return completeMultipartUploadResult{}, err
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}
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if err := s3utils.CheckValidObjectName(objectName); err != nil {
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return completeMultipartUploadResult{}, err
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}
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// Initialize url queries.
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urlValues := make(url.Values)
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urlValues.Set("uploadId", uploadID)
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// Marshal complete multipart body.
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completeMultipartUploadBytes, err := xml.Marshal(complete)
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if err != nil {
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return completeMultipartUploadResult{}, err
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}
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// Instantiate all the complete multipart buffer.
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completeMultipartUploadBuffer := bytes.NewReader(completeMultipartUploadBytes)
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reqMetadata := requestMetadata{
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bucketName: bucketName,
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objectName: objectName,
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queryValues: urlValues,
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contentBody: completeMultipartUploadBuffer,
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contentLength: int64(len(completeMultipartUploadBytes)),
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contentSHA256Bytes: sum256(completeMultipartUploadBytes),
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}
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// Execute POST to complete multipart upload for an objectName.
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resp, err := c.executeMethod("POST", reqMetadata)
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defer closeResponse(resp)
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if err != nil {
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return completeMultipartUploadResult{}, err
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}
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if resp != nil {
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if resp.StatusCode != http.StatusOK {
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return completeMultipartUploadResult{}, httpRespToErrorResponse(resp, bucketName, objectName)
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}
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}
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// Read resp.Body into a []bytes to parse for Error response inside the body
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var b []byte
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b, err = ioutil.ReadAll(resp.Body)
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if err != nil {
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return completeMultipartUploadResult{}, err
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}
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// Decode completed multipart upload response on success.
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completeMultipartUploadResult := completeMultipartUploadResult{}
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err = xmlDecoder(bytes.NewReader(b), &completeMultipartUploadResult)
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if err != nil {
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// xml parsing failure due to presence an ill-formed xml fragment
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return completeMultipartUploadResult, err
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} else if completeMultipartUploadResult.Bucket == "" {
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// xml's Decode method ignores well-formed xml that don't apply to the type of value supplied.
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// In this case, it would leave completeMultipartUploadResult with the corresponding zero-values
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// of the members.
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// Decode completed multipart upload response on failure
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completeMultipartUploadErr := ErrorResponse{}
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err = xmlDecoder(bytes.NewReader(b), &completeMultipartUploadErr)
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if err != nil {
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// xml parsing failure due to presence an ill-formed xml fragment
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return completeMultipartUploadResult, err
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}
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return completeMultipartUploadResult, completeMultipartUploadErr
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}
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return completeMultipartUploadResult, nil
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}
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