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minio/object-common-multipart.go

511 lines
16 KiB

/*
* Minio Cloud Storage, (C) 2016 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 main
import (
"crypto/md5"
"encoding/hex"
"fmt"
"io"
"io/ioutil"
"path"
"strconv"
"strings"
"github.com/Sirupsen/logrus"
"github.com/skyrings/skyring-common/tools/uuid"
)
/// Common multipart object layer functions.
// newMultipartUploadCommon - initialize a new multipart, is a common
// function for both object layers.
func newMultipartUploadCommon(storage StorageAPI, bucket string, object string) (uploadID string, err error) {
// Verify if bucket name is valid.
if !IsValidBucketName(bucket) {
return "", BucketNameInvalid{Bucket: bucket}
}
// Verify if object name is valid.
if !IsValidObjectName(object) {
return "", ObjectNameInvalid{Bucket: bucket, Object: object}
}
// Verify whether the bucket exists.
if isExist, err := isBucketExist(storage, bucket); err != nil {
return "", err
} else if !isExist {
return "", BucketNotFound{Bucket: bucket}
}
// Loops through until successfully generates a new unique upload id.
for {
uuid, err := uuid.New()
if err != nil {
return "", err
}
uploadID := uuid.String()
uploadIDPath := path.Join(mpartMetaPrefix, bucket, object, uploadID)
tempUploadIDPath := path.Join(tmpMetaPrefix, bucket, object, uploadID)
if _, err = storage.StatFile(minioMetaBucket, uploadIDPath); err != nil {
if err != errFileNotFound {
return "", toObjectErr(err, minioMetaBucket, uploadIDPath)
}
// uploadIDPath doesn't exist, so create empty file to reserve the name
var w io.WriteCloser
if w, err = storage.CreateFile(minioMetaBucket, tempUploadIDPath); err != nil {
return "", toObjectErr(err, minioMetaBucket, tempUploadIDPath)
}
// Close the writer.
if err = w.Close(); err != nil {
return "", toObjectErr(err, minioMetaBucket, tempUploadIDPath)
}
err = storage.RenameFile(minioMetaBucket, tempUploadIDPath, minioMetaBucket, uploadIDPath)
if err != nil {
return "", toObjectErr(err, minioMetaBucket, uploadIDPath)
}
return uploadID, nil
}
// uploadIDPath already exists.
// loop again to try with different uuid generated.
}
}
// putObjectPartCommon - put object part.
func putObjectPartCommon(storage StorageAPI, bucket string, object string, uploadID string, partID int, size int64, data io.Reader, md5Hex string) (string, error) {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return "", BucketNameInvalid{Bucket: bucket}
}
if !IsValidObjectName(object) {
return "", ObjectNameInvalid{Bucket: bucket, Object: object}
}
// Verify whether the bucket exists.
if isExist, err := isBucketExist(storage, bucket); err != nil {
return "", err
} else if !isExist {
return "", BucketNotFound{Bucket: bucket}
}
if status, err := isUploadIDExists(storage, bucket, object, uploadID); err != nil {
return "", err
} else if !status {
return "", InvalidUploadID{UploadID: uploadID}
}
partSuffix := fmt.Sprintf("%s.%d", uploadID, partID)
partSuffixPath := path.Join(tmpMetaPrefix, bucket, object, partSuffix)
fileWriter, err := storage.CreateFile(minioMetaBucket, partSuffixPath)
if err != nil {
return "", toObjectErr(err, bucket, object)
}
// Initialize md5 writer.
md5Writer := md5.New()
// Instantiate a new multi writer.
multiWriter := io.MultiWriter(md5Writer, fileWriter)
// Instantiate checksum hashers and create a multiwriter.
if size > 0 {
if _, err = io.CopyN(multiWriter, data, size); err != nil {
safeCloseAndRemove(fileWriter)
return "", toObjectErr(err, bucket, object)
}
// Reader shouldn't have more data what mentioned in size argument.
// reading one more byte from the reader to validate it.
// expected to fail, success validates existence of more data in the reader.
if _, err = io.CopyN(ioutil.Discard, data, 1); err == nil {
safeCloseAndRemove(fileWriter)
return "", UnExpectedDataSize{Size: int(size)}
}
} else {
if _, err = io.Copy(multiWriter, data); err != nil {
safeCloseAndRemove(fileWriter)
return "", toObjectErr(err, bucket, object)
}
}
newMD5Hex := hex.EncodeToString(md5Writer.Sum(nil))
if md5Hex != "" {
if newMD5Hex != md5Hex {
safeCloseAndRemove(fileWriter)
return "", BadDigest{md5Hex, newMD5Hex}
}
}
err = fileWriter.Close()
if err != nil {
return "", err
}
partSuffixMD5 := fmt.Sprintf("%s.%.5d.%s", uploadID, partID, newMD5Hex)
partSuffixMD5Path := path.Join(mpartMetaPrefix, bucket, object, partSuffixMD5)
err = storage.RenameFile(minioMetaBucket, partSuffixPath, minioMetaBucket, partSuffixMD5Path)
if err != nil {
return "", err
}
return newMD5Hex, nil
}
// Cleanup all temp entries inside tmpMetaPrefix directory, upon server initialization.
func cleanupAllTmpEntries(storage StorageAPI) error {
return cleanupUploadedParts(storage, tmpMetaPrefix, "", "", "")
}
// Wrapper to which removes all the uploaded parts after a successful
// complete multipart upload.
func cleanupUploadedParts(storage StorageAPI, prefix, bucket, object, uploadID string) error {
markerPath := ""
for {
uploadIDPath := path.Join(prefix, bucket, object, uploadID)
fileInfos, eof, err := storage.ListFiles(minioMetaBucket, uploadIDPath, markerPath, false, 1000)
if err != nil {
if err == errFileNotFound {
return InvalidUploadID{UploadID: uploadID}
}
return toObjectErr(err)
}
for _, fileInfo := range fileInfos {
storage.DeleteFile(minioMetaBucket, fileInfo.Name)
markerPath = fileInfo.Name
}
if eof {
break
}
}
return nil
}
// abortMultipartUploadCommon - aborts a multipart upload, common
// function used by both object layers.
func abortMultipartUploadCommon(storage StorageAPI, bucket, object, uploadID string) error {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return BucketNameInvalid{Bucket: bucket}
}
if !IsValidObjectName(object) {
return ObjectNameInvalid{Bucket: bucket, Object: object}
}
if status, err := isUploadIDExists(storage, bucket, object, uploadID); err != nil {
return err
} else if !status {
return InvalidUploadID{UploadID: uploadID}
}
return cleanupUploadedParts(storage, mpartMetaPrefix, bucket, object, uploadID)
}
// listLeafEntries - lists all entries if a given prefixPath is a leaf
// directory, returns error if any - returns empty list if prefixPath
// is not a leaf directory.
func listLeafEntries(storage StorageAPI, prefixPath string) (entries []FileInfo, e error) {
var markerPath string
for {
fileInfos, eof, err := storage.ListFiles(minioMetaBucket, prefixPath, markerPath, false, 1000)
if err != nil {
log.WithFields(logrus.Fields{
"prefixPath": prefixPath,
"markerPath": markerPath,
}).Errorf("%s", err)
return nil, err
}
for _, fileInfo := range fileInfos {
// Set marker for next batch of ListFiles.
markerPath = fileInfo.Name
if fileInfo.Mode.IsDir() {
// If a directory is found, doesn't return anything.
return nil, nil
}
fileName := path.Base(fileInfo.Name)
if !strings.Contains(fileName, ".") {
// Skip the entry if it is of the pattern bucket/object/uploadID.partNum.md5sum
// and retain entries of the pattern bucket/object/uploadID
entries = append(entries, fileInfo)
}
}
if eof {
break
}
}
return entries, nil
}
// listMetaBucketMultipartFiles - list all files at a given prefix inside minioMetaBucket.
func listMetaBucketMultipartFiles(storage StorageAPI, prefixPath string, markerPath string, recursive bool, maxKeys int) (allFileInfos []FileInfo, eof bool, err error) {
// newMaxKeys tracks the size of entries which are going to be
// returned back.
var newMaxKeys int
// Following loop gathers and filters out special files inside
// minio meta volume.
for {
var fileInfos []FileInfo
// List files up to maxKeys-newMaxKeys, since we are skipping
// entries for special files.
fileInfos, eof, err = storage.ListFiles(minioMetaBucket, prefixPath, markerPath, recursive, maxKeys-newMaxKeys)
if err != nil {
log.WithFields(logrus.Fields{
"prefixPath": prefixPath,
"markerPath": markerPath,
"recursive": recursive,
"maxKeys": maxKeys,
}).Errorf("%s", err)
return nil, true, err
}
// Loop through and validate individual file.
for _, fi := range fileInfos {
var entries []FileInfo
if fi.Mode.IsDir() {
// List all the entries if fi.Name is a leaf directory, if
// fi.Name is not a leaf directory then the resulting
// entries are empty.
entries, err = listLeafEntries(storage, fi.Name)
if err != nil {
log.WithFields(logrus.Fields{
"prefixPath": fi.Name,
}).Errorf("%s", err)
return nil, false, err
}
}
// Set markerPath for next batch of listing.
markerPath = fi.Name
if len(entries) > 0 {
// We reach here for non-recursive case and a leaf entry.
for _, entry := range entries {
allFileInfos = append(allFileInfos, entry)
newMaxKeys++
// If we have reached the maxKeys, it means we have listed
// everything that was requested. Return right here.
if newMaxKeys == maxKeys {
// Return values:
// allFileInfos : "maxKeys" number of entries.
// eof : eof returned by fs.storage.ListFiles()
// error : nil
return
}
}
} else {
// We reach here for a non-recursive case non-leaf entry
// OR recursive case with fi.Name matching pattern bucket/object/uploadID[.partNum.md5sum]
if !fi.Mode.IsDir() { // Do not skip non-recursive case directory entries.
// Skip files matching pattern bucket/object/uploadID.partNum.md5sum
// and retain files matching pattern bucket/object/uploadID
specialFile := path.Base(fi.Name)
if strings.Contains(specialFile, ".") {
// Contains partnumber and md5sum info, skip this.
continue
}
}
allFileInfos = append(allFileInfos, fi)
newMaxKeys++
// If we have reached the maxKeys, it means we have listed
// everything that was requested. Return right here.
if newMaxKeys == maxKeys {
// Return values:
// allFileInfos : "maxKeys" number of entries.
// eof : eof returned by fs.storage.ListFiles()
// error : nil
return
}
}
}
// If we have reached eof then we break out.
if eof {
break
}
}
// Return entries here.
return allFileInfos, eof, nil
}
// listMultipartUploadsCommon - lists all multipart uploads, common
// function for both object layers.
func listMultipartUploadsCommon(storage StorageAPI, bucket, prefix, keyMarker, uploadIDMarker, delimiter string, maxUploads int) (ListMultipartsInfo, error) {
result := ListMultipartsInfo{}
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return ListMultipartsInfo{}, BucketNameInvalid{Bucket: bucket}
}
if !IsValidObjectPrefix(prefix) {
return ListMultipartsInfo{}, ObjectNameInvalid{Bucket: bucket, Object: prefix}
}
// Verify if delimiter is anything other than '/', which we do not support.
if delimiter != "" && delimiter != slashSeparator {
return ListMultipartsInfo{}, UnsupportedDelimiter{
Delimiter: delimiter,
}
}
// Verify if marker has prefix.
if keyMarker != "" && !strings.HasPrefix(keyMarker, prefix) {
return ListMultipartsInfo{}, InvalidMarkerPrefixCombination{
Marker: keyMarker,
Prefix: prefix,
}
}
if uploadIDMarker != "" {
if strings.HasSuffix(keyMarker, slashSeparator) {
return result, InvalidUploadIDKeyCombination{
UploadIDMarker: uploadIDMarker,
KeyMarker: keyMarker,
}
}
id, err := uuid.Parse(uploadIDMarker)
if err != nil {
return result, err
}
if id.IsZero() {
return result, MalformedUploadID{
UploadID: uploadIDMarker,
}
}
}
recursive := true
if delimiter == slashSeparator {
recursive = false
}
result.IsTruncated = true
result.MaxUploads = maxUploads
// Not using path.Join() as it strips off the trailing '/'.
// Also bucket should always be followed by '/' even if prefix is empty.
multipartPrefixPath := pathJoin(mpartMetaPrefix, pathJoin(bucket, prefix))
multipartMarkerPath := ""
if keyMarker != "" {
keyMarkerPath := pathJoin(pathJoin(bucket, keyMarker), uploadIDMarker)
multipartMarkerPath = pathJoin(mpartMetaPrefix, keyMarkerPath)
}
// List all the multipart files at prefixPath, starting with marker keyMarkerPath.
fileInfos, eof, err := listMetaBucketMultipartFiles(storage, multipartPrefixPath, multipartMarkerPath, recursive, maxUploads)
if err != nil {
log.WithFields(logrus.Fields{
"prefixPath": multipartPrefixPath,
"markerPath": multipartMarkerPath,
"recursive": recursive,
"maxUploads": maxUploads,
}).Errorf("listMetaBucketMultipartFiles failed with %s", err)
return ListMultipartsInfo{}, err
}
// Loop through all the received files fill in the multiparts result.
for _, fi := range fileInfos {
var objectName string
var uploadID string
if fi.Mode.IsDir() {
// All directory entries are common prefixes.
uploadID = "" // Upload ids are empty for CommonPrefixes.
objectName = strings.TrimPrefix(fi.Name, retainSlash(path.Join(mpartMetaPrefix, bucket)))
result.CommonPrefixes = append(result.CommonPrefixes, objectName)
} else {
uploadID = path.Base(fi.Name)
objectName = strings.TrimPrefix(path.Dir(fi.Name), retainSlash(path.Join(mpartMetaPrefix, bucket)))
result.Uploads = append(result.Uploads, uploadMetadata{
Object: objectName,
UploadID: uploadID,
Initiated: fi.ModTime,
})
}
result.NextKeyMarker = objectName
result.NextUploadIDMarker = uploadID
}
result.IsTruncated = !eof
if !result.IsTruncated {
result.NextKeyMarker = ""
result.NextUploadIDMarker = ""
}
return result, nil
}
// ListObjectParts - list object parts, common function across both
// object layers.
func listObjectPartsCommon(storage StorageAPI, bucket, object, uploadID string, partNumberMarker, maxParts int) (ListPartsInfo, error) {
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return ListPartsInfo{}, BucketNameInvalid{Bucket: bucket}
}
if !IsValidObjectName(object) {
return ListPartsInfo{}, ObjectNameInvalid{Bucket: bucket, Object: object}
}
if status, err := isUploadIDExists(storage, bucket, object, uploadID); err != nil {
return ListPartsInfo{}, err
} else if !status {
return ListPartsInfo{}, InvalidUploadID{UploadID: uploadID}
}
result := ListPartsInfo{}
var markerPath string
nextPartNumberMarker := 0
uploadIDPath := path.Join(mpartMetaPrefix, bucket, object, uploadID)
// Figure out the marker for the next subsequent calls, if the
// partNumberMarker is already set.
if partNumberMarker > 0 {
partNumberMarkerPath := uploadIDPath + "." + fmt.Sprintf("%.5d", partNumberMarker) + "."
fileInfos, _, err := storage.ListFiles(minioMetaBucket, partNumberMarkerPath, "", false, 1)
if err != nil {
return result, toObjectErr(err, minioMetaBucket, partNumberMarkerPath)
}
if len(fileInfos) == 0 {
return result, InvalidPart{}
}
markerPath = fileInfos[0].Name
}
uploadIDPrefix := uploadIDPath + "."
fileInfos, eof, err := storage.ListFiles(minioMetaBucket, uploadIDPrefix, markerPath, false, maxParts)
if err != nil {
return result, InvalidPart{}
}
for _, fileInfo := range fileInfos {
fileName := path.Base(fileInfo.Name)
splitResult := strings.Split(fileName, ".")
partNum, err := strconv.Atoi(splitResult[1])
if err != nil {
return result, err
}
md5sum := splitResult[2]
result.Parts = append(result.Parts, partInfo{
PartNumber: partNum,
LastModified: fileInfo.ModTime,
ETag: md5sum,
Size: fileInfo.Size,
})
nextPartNumberMarker = partNum
}
result.Bucket = bucket
result.Object = object
result.UploadID = uploadID
result.PartNumberMarker = partNumberMarker
result.NextPartNumberMarker = nextPartNumberMarker
result.MaxParts = maxParts
result.IsTruncated = !eof
return result, nil
}
// isUploadIDExists - verify if a given uploadID exists and is valid.
func isUploadIDExists(storage StorageAPI, bucket, object, uploadID string) (bool, error) {
uploadIDPath := path.Join(mpartMetaPrefix, bucket, object, uploadID)
st, err := storage.StatFile(minioMetaBucket, uploadIDPath)
if err != nil {
// Upload id does not exist.
if err == errFileNotFound {
return false, nil
}
return false, err
}
// Upload id exists and is a regular file.
return st.Mode.IsRegular(), nil
}