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getPartsInfo: Simplify fetching parts info.
This change also avoids making an unecessary listParts call for a new multipart upload session.
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Harshavardhana
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Jan 7, 2016
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,167 @@ | ||
| /* | ||
| * 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 ( | ||
| "crypto/md5" | ||
| "crypto/sha256" | ||
| "hash" | ||
| "io" | ||
| "os" | ||
| ) | ||
|
|
||
| // 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 | ||
| } | ||
|
|
||
| // hashCopyN - Calculates Md5sum and SHA256sum for upto partSize amount of bytes. | ||
| func (c Client) hashCopyN(writer io.ReadWriteSeeker, reader io.Reader, partSize int64) (md5Sum, sha256Sum []byte, size int64, err error) { | ||
| // MD5 and SHA256 hasher. | ||
| var hashMD5, hashSHA256 hash.Hash | ||
| // MD5 and SHA256 hasher. | ||
| hashMD5 = md5.New() | ||
| hashWriter := io.MultiWriter(writer, hashMD5) | ||
| if c.signature.isV4() { | ||
| hashSHA256 = sha256.New() | ||
| hashWriter = io.MultiWriter(writer, hashMD5, hashSHA256) | ||
| } | ||
|
|
||
| // 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 nil, nil, 0, err | ||
| } | ||
| } | ||
|
|
||
| // Seek back to beginning of input, any error fail right here. | ||
| if _, err := writer.Seek(0, 0); err != nil { | ||
| return nil, nil, 0, err | ||
| } | ||
|
|
||
| // Finalize md5shum and sha256 sum. | ||
| md5Sum = hashMD5.Sum(nil) | ||
| if c.signature.isV4() { | ||
| sha256Sum = hashSHA256.Sum(nil) | ||
| } | ||
| return md5Sum, sha256Sum, 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) getUploadID(bucketName, objectName, contentType string) (uploadID string, isNew bool, err error) { | ||
| // Input validation. | ||
| if err := isValidBucketName(bucketName); err != nil { | ||
| return "", false, err | ||
| } | ||
| if err := isValidObjectName(objectName); err != nil { | ||
| return "", false, err | ||
| } | ||
|
|
||
| // Set content Type to default if empty string. | ||
| if contentType == "" { | ||
| contentType = "application/octet-stream" | ||
| } | ||
|
|
||
| // Find upload id for previous upload for an object. | ||
| uploadID, err = c.findUploadID(bucketName, objectName) | ||
| if err != nil { | ||
| return "", false, err | ||
| } | ||
| if uploadID == "" { | ||
| // Initiate multipart upload for an object. | ||
| initMultipartUploadResult, err := c.initiateMultipartUpload(bucketName, objectName, contentType) | ||
| if err != nil { | ||
| return "", false, err | ||
| } | ||
| // Save the new upload id. | ||
| uploadID = initMultipartUploadResult.UploadID | ||
| // Indicate that this is a new upload id. | ||
| isNew = true | ||
| } | ||
| return uploadID, isNew, nil | ||
| } | ||
|
|
||
| // computeHash - Calculates MD5 and SHA256 for an input read Seeker. | ||
| func (c Client) computeHash(reader io.ReadSeeker) (md5Sum, sha256Sum []byte, size int64, err error) { | ||
| // MD5 and SHA256 hasher. | ||
| var hashMD5, hashSHA256 hash.Hash | ||
| // MD5 and SHA256 hasher. | ||
| hashMD5 = md5.New() | ||
| hashWriter := io.MultiWriter(hashMD5) | ||
| if c.signature.isV4() { | ||
| hashSHA256 = sha256.New() | ||
| hashWriter = io.MultiWriter(hashMD5, hashSHA256) | ||
| } | ||
|
|
||
| size, err = io.Copy(hashWriter, reader) | ||
| if err != nil { | ||
| return nil, nil, 0, err | ||
| } | ||
|
|
||
| // Seek back reader to the beginning location. | ||
| if _, err := reader.Seek(0, 0); err != nil { | ||
| return nil, nil, 0, err | ||
| } | ||
|
|
||
| // Finalize md5shum and sha256 sum. | ||
| md5Sum = hashMD5.Sum(nil) | ||
| if c.signature.isV4() { | ||
| sha256Sum = hashSHA256.Sum(nil) | ||
| } | ||
| return md5Sum, sha256Sum, size, nil | ||
| } | ||
|
|
||
| // Fetch all parts info, including total uploaded size, maximum part | ||
| // size and max part number. | ||
| func (c Client) getPartsInfo(bucketName, objectName, uploadID string) (prtsInfo map[int]objectPart, totalSize int64, maxPrtSize int64, maxPrtNumber int, err error) { | ||
| // Fetch previously upload parts. | ||
| prtsInfo, err = c.listObjectParts(bucketName, objectName, uploadID) | ||
| if err != nil { | ||
| return nil, 0, 0, 0, err | ||
| } | ||
| // Peek through all the parts and calculate totalSize, maximum | ||
| // part size and last part number. | ||
| for _, prtInfo := range prtsInfo { | ||
| // Save previously uploaded size. | ||
| totalSize += prtInfo.Size | ||
| // Choose the maximum part size. | ||
| if prtInfo.Size >= maxPrtSize { | ||
| maxPrtSize = prtInfo.Size | ||
| } | ||
| // Choose the maximum part number. | ||
| if maxPrtNumber < prtInfo.PartNumber { | ||
| maxPrtNumber = prtInfo.PartNumber | ||
| } | ||
| } | ||
| return prtsInfo, totalSize, maxPrtSize, maxPrtNumber, nil | ||
| } |
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