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Merge pull request minio#299 from harshavardhana/put-object
getPartsInfo: Simplify fetching parts info.
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/* | ||
* 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. | ||
*/ | ||
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package minio | ||
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import ( | ||
"crypto/md5" | ||
"crypto/sha256" | ||
"hash" | ||
"io" | ||
"os" | ||
) | ||
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// Verify if reader is *os.File | ||
func isFile(reader io.Reader) (ok bool) { | ||
_, ok = reader.(*os.File) | ||
return | ||
} | ||
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// Verify if reader is *minio.Object | ||
func isObject(reader io.Reader) (ok bool) { | ||
_, ok = reader.(*Object) | ||
return | ||
} | ||
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// Verify if reader is a generic ReaderAt | ||
func isReadAt(reader io.Reader) (ok bool) { | ||
_, ok = reader.(io.ReaderAt) | ||
return | ||
} | ||
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// 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) | ||
} | ||
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// 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 | ||
} | ||
} | ||
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// Seek back to beginning of input, any error fail right here. | ||
if _, err := writer.Seek(0, 0); err != nil { | ||
return nil, nil, 0, err | ||
} | ||
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// Finalize md5shum and sha256 sum. | ||
md5Sum = hashMD5.Sum(nil) | ||
if c.signature.isV4() { | ||
sha256Sum = hashSHA256.Sum(nil) | ||
} | ||
return md5Sum, sha256Sum, size, err | ||
} | ||
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// 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 | ||
} | ||
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// Set content Type to default if empty string. | ||
if contentType == "" { | ||
contentType = "application/octet-stream" | ||
} | ||
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// 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 | ||
} | ||
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// 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) | ||
} | ||
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size, err = io.Copy(hashWriter, reader) | ||
if err != nil { | ||
return nil, nil, 0, err | ||
} | ||
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// Seek back reader to the beginning location. | ||
if _, err := reader.Seek(0, 0); err != nil { | ||
return nil, nil, 0, err | ||
} | ||
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// Finalize md5shum and sha256 sum. | ||
md5Sum = hashMD5.Sum(nil) | ||
if c.signature.isV4() { | ||
sha256Sum = hashSHA256.Sum(nil) | ||
} | ||
return md5Sum, sha256Sum, size, nil | ||
} | ||
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// 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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