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minio/object-common-multipart.go

614 lines
21 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"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"path"
"sort"
"strconv"
"strings"
"github.com/skyrings/skyring-common/tools/uuid"
)
const (
incompleteFile = "00000.incomplete"
uploadsJSONFile = "uploads.json"
)
// createUploadsJSON - create uploads.json placeholder file.
func createUploadsJSON(storage StorageAPI, bucket, object, uploadID string) error {
// Place holder uploads.json
uploadsPath := path.Join(mpartMetaPrefix, bucket, object, uploadsJSONFile)
uploadsJSONSuffix := fmt.Sprintf("%s.%s", uploadID, uploadsJSONFile)
tmpUploadsPath := path.Join(tmpMetaPrefix, bucket, object, uploadsJSONSuffix)
w, err := storage.CreateFile(minioMetaBucket, uploadsPath)
if err != nil {
return err
}
if err = w.Close(); err != nil {
if clErr := safeCloseAndRemove(w); clErr != nil {
return clErr
}
return err
}
_, err = storage.StatFile(minioMetaBucket, uploadsPath)
if err != nil {
if err == errFileNotFound {
err = storage.RenameFile(minioMetaBucket, tmpUploadsPath, minioMetaBucket, uploadsPath)
if err == nil {
return nil
}
}
if derr := storage.DeleteFile(minioMetaBucket, tmpUploadsPath); derr != nil {
return derr
}
return err
}
return nil
}
/// 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, meta map[string]string) (uploadID string, err error) {
// Verify if bucket name is valid.
if !IsValidBucketName(bucket) {
return "", BucketNameInvalid{Bucket: bucket}
}
// Verify whether the bucket exists.
if !isBucketExist(storage, bucket) {
return "", BucketNotFound{Bucket: bucket}
}
// Verify if object name is valid.
if !IsValidObjectName(object) {
return "", ObjectNameInvalid{Bucket: bucket, Object: object}
}
// This lock needs to be held for any changes to the directory contents of ".minio/multipart/object/"
nsMutex.Lock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object))
defer nsMutex.Unlock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object))
// Loops through until successfully generates a new unique upload id.
for {
uuid, err := uuid.New()
if err != nil {
return "", err
}
uploadID := uuid.String()
// Create placeholder file 'uploads.json'
err = createUploadsJSON(storage, bucket, object, uploadID)
if err != nil {
return "", err
}
uploadIDPath := path.Join(mpartMetaPrefix, bucket, object, uploadID, incompleteFile)
incompleteSuffix := fmt.Sprintf("%s.%s", uploadID, incompleteFile)
tempUploadIDPath := path.Join(tmpMetaPrefix, bucket, object, incompleteSuffix)
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)
}
// Encode the uploaded metadata into incomplete file.
encoder := json.NewEncoder(w)
err = encoder.Encode(&meta)
if err != nil {
if clErr := safeCloseAndRemove(w); clErr != nil {
return "", toObjectErr(clErr, minioMetaBucket, tempUploadIDPath)
}
return "", toObjectErr(err, minioMetaBucket, tempUploadIDPath)
}
// Close the writer.
if err = w.Close(); err != nil {
if clErr := safeCloseAndRemove(w); clErr != nil {
return "", toObjectErr(clErr, minioMetaBucket, tempUploadIDPath)
}
return "", toObjectErr(err, minioMetaBucket, tempUploadIDPath)
}
// Rename the file to the actual location from temporary path.
err = storage.RenameFile(minioMetaBucket, tempUploadIDPath, minioMetaBucket, uploadIDPath)
if err != nil {
if derr := storage.DeleteFile(minioMetaBucket, tempUploadIDPath); derr != nil {
return "", toObjectErr(derr, minioMetaBucket, tempUploadIDPath)
}
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}
}
// Verify whether the bucket exists.
if !isBucketExist(storage, bucket) {
return "", BucketNotFound{Bucket: bucket}
}
if !IsValidObjectName(object) {
return "", ObjectNameInvalid{Bucket: bucket, Object: object}
}
if !isUploadIDExists(storage, bucket, object, uploadID) {
return "", InvalidUploadID{UploadID: uploadID}
}
// Hold read lock on the uploadID so that no one aborts it.
nsMutex.RLock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object, uploadID))
defer nsMutex.RUnlock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object, uploadID))
// Hold write lock on the part so that there is no parallel upload on the part.
nsMutex.Lock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object, uploadID, strconv.Itoa(partID)))
defer nsMutex.Unlock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object, uploadID, strconv.Itoa(partID)))
partSuffix := fmt.Sprintf("%s.%.5d", 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 {
if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
return "", toObjectErr(clErr, bucket, object)
}
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 {
if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
return "", toObjectErr(clErr, bucket, object)
}
return "", UnExpectedDataSize{Size: int(size)}
}
} else {
if _, err = io.Copy(multiWriter, data); err != nil {
if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
return "", toObjectErr(clErr, bucket, object)
}
return "", toObjectErr(err, bucket, object)
}
}
newMD5Hex := hex.EncodeToString(md5Writer.Sum(nil))
if md5Hex != "" {
if newMD5Hex != md5Hex {
if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
return "", toObjectErr(clErr, bucket, object)
}
return "", BadDigest{md5Hex, newMD5Hex}
}
}
err = fileWriter.Close()
if err != nil {
if clErr := safeCloseAndRemove(fileWriter); clErr != nil {
return "", toObjectErr(clErr, bucket, object)
}
return "", err
}
partSuffixMD5 := fmt.Sprintf("%.5d.%s", partID, newMD5Hex)
partSuffixMD5Path := path.Join(mpartMetaPrefix, bucket, object, uploadID, partSuffixMD5)
if _, err = storage.StatFile(minioMetaBucket, partSuffixMD5Path); err == nil {
// Part already uploaded as md5sum matches with the previous part.
// Just delete the temporary file.
if err = storage.DeleteFile(minioMetaBucket, partSuffixPath); err != nil {
return "", toObjectErr(err, minioMetaBucket, partSuffixPath)
}
return newMD5Hex, nil
}
err = storage.RenameFile(minioMetaBucket, partSuffixPath, minioMetaBucket, partSuffixMD5Path)
if err != nil {
if derr := storage.DeleteFile(minioMetaBucket, partSuffixPath); derr != nil {
return "", toObjectErr(derr, minioMetaBucket, partSuffixPath)
}
return "", toObjectErr(err, minioMetaBucket, partSuffixMD5Path)
}
return newMD5Hex, nil
}
// Wrapper to which removes all the uploaded parts after a successful
// complete multipart upload.
func cleanupUploadedParts(storage StorageAPI, bucket, object, uploadID string) error {
return cleanupDir(storage, minioMetaBucket, path.Join(mpartMetaPrefix, bucket, object, uploadID))
}
// 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 !isBucketExist(storage, bucket) {
return BucketNotFound{Bucket: bucket}
}
if !IsValidObjectName(object) {
return ObjectNameInvalid{Bucket: bucket, Object: object}
}
if !isUploadIDExists(storage, bucket, object, uploadID) {
return InvalidUploadID{UploadID: uploadID}
}
// Hold lock so that there is no competing complete-multipart-upload or put-object-part.
nsMutex.Lock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object, uploadID))
defer nsMutex.Unlock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object, uploadID))
if err := cleanupUploadedParts(storage, bucket, object, uploadID); err != nil {
return err
}
// Validate if there are other incomplete upload-id's present for
// the object, if yes do not attempt to delete 'uploads.json'.
if entries, err := storage.ListDir(minioMetaBucket, path.Join(mpartMetaPrefix, bucket, object)); err == nil {
if len(entries) > 1 {
return nil
}
}
uploadsJSONPath := path.Join(mpartMetaPrefix, bucket, object, uploadsJSONFile)
if err := storage.DeleteFile(minioMetaBucket, uploadsJSONPath); err != nil {
return err
}
return nil
}
// isIncompleteMultipart - is object incomplete multipart.
func isIncompleteMultipart(storage StorageAPI, objectPath string) (bool, error) {
_, err := storage.StatFile(minioMetaBucket, path.Join(objectPath, uploadsJSONFile))
if err != nil {
if err == errFileNotFound {
return false, nil
}
return false, err
}
return true, nil
}
// 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 []string, err error) {
var ok bool
if ok, err = isIncompleteMultipart(storage, prefixPath); err != nil {
return nil, err
} else if !ok {
return nil, nil
}
entries, err = storage.ListDir(minioMetaBucket, prefixPath)
if err != nil {
return nil, err
}
var newEntries []string
for _, entry := range entries {
if strings.HasSuffix(entry, slashSeparator) {
newEntries = append(newEntries, entry)
}
}
return newEntries, nil
}
// listMetaBucketMultipartFiles - list all files at a given prefix inside minioMetaBucket.
func listMetaBucketMultipartFiles(layer ObjectLayer, prefixPath string, markerPath string, recursive bool, maxKeys int) (fileInfos []FileInfo, eof bool, err error) {
var storage StorageAPI
switch l := layer.(type) {
case fsObjects:
storage = l.storage
case xlObjects:
storage = l.storage
}
walker := lookupTreeWalk(layer, listParams{minioMetaBucket, recursive, markerPath, prefixPath})
if walker == nil {
walker = startTreeWalk(layer, minioMetaBucket, prefixPath, markerPath, recursive)
}
// 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 {
walkResult, ok := <-walker.ch
if !ok {
// Closed channel.
eof = true
break
}
// For any walk error return right away.
if walkResult.err != nil {
// File not found or Disk not found is a valid case.
if walkResult.err == errFileNotFound || walkResult.err == errDiskNotFound {
return nil, true, nil
}
return nil, false, toObjectErr(walkResult.err, minioMetaBucket, prefixPath)
}
fi := walkResult.fileInfo
var entries []string
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 {
return nil, false, err
}
}
if len(entries) > 0 {
// We reach here for non-recursive case and a leaf entry.
sort.Strings(entries)
for _, entry := range entries {
var fileInfo FileInfo
incompleteUploadFile := path.Join(fi.Name, entry, incompleteFile)
fileInfo, err = storage.StatFile(minioMetaBucket, incompleteUploadFile)
if err != nil {
return nil, false, err
}
fileInfo.Name = path.Join(fi.Name, entry)
fileInfos = append(fileInfos, fileInfo)
newMaxKeys++
// If we have reached the maxKeys, it means we have listed
// everything that was requested. Return right here.
if newMaxKeys == maxKeys {
return
}
}
} else {
// We reach here for a non-recursive case non-leaf entry
// OR recursive case with fi.Name.
if !fi.Mode.IsDir() { // Do not skip non-recursive case directory entries.
// Validate if 'fi.Name' is incomplete multipart.
if !strings.HasSuffix(fi.Name, incompleteFile) {
continue
}
fi.Name = path.Dir(fi.Name)
}
fileInfos = append(fileInfos, fi)
newMaxKeys++
// If we have reached the maxKeys, it means we have listed
// everything that was requested. Return right here.
if newMaxKeys == maxKeys {
return
}
}
}
// Return entries here.
return fileInfos, eof, nil
}
// FIXME: Currently the code sorts based on keyName/upload-id which is
// in correct based on the S3 specs. According to s3 specs we are
// supposed to only lexically sort keyNames and then for keyNames with
// multiple upload ids should be sorted based on the initiated time.
// Currently this case is not handled.
// listMultipartUploadsCommon - lists all multipart uploads, common
// function for both object layers.
func listMultipartUploadsCommon(layer ObjectLayer, bucket, prefix, keyMarker, uploadIDMarker, delimiter string, maxUploads int) (ListMultipartsInfo, error) {
var storage StorageAPI
switch l := layer.(type) {
case xlObjects:
storage = l.storage
case fsObjects:
storage = l.storage
}
result := ListMultipartsInfo{}
// Verify if bucket is valid.
if !IsValidBucketName(bucket) {
return ListMultipartsInfo{}, BucketNameInvalid{Bucket: bucket}
}
if !isBucketExist(storage, bucket) {
return ListMultipartsInfo{}, BucketNotFound{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 '/'.
multipartPrefixPath := pathJoin(mpartMetaPrefix, pathJoin(bucket, prefix))
if prefix == "" {
// Should have a trailing "/" if prefix is ""
// For ex. multipartPrefixPath should be "multipart/bucket/" if prefix is ""
multipartPrefixPath += slashSeparator
}
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(layer, multipartPrefixPath, multipartMarkerPath, recursive, maxUploads)
if err != nil {
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(pathJoin(mpartMetaPrefix, bucket)))
result.CommonPrefixes = append(result.CommonPrefixes, objectName)
} else {
uploadID = path.Base(fi.Name)
objectName = strings.TrimPrefix(path.Dir(fi.Name), retainSlash(pathJoin(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}
}
// Verify whether the bucket exists.
if !isBucketExist(storage, bucket) {
return ListPartsInfo{}, BucketNotFound{Bucket: bucket}
}
if !IsValidObjectName(object) {
return ListPartsInfo{}, ObjectNameInvalid{Bucket: bucket, Object: object}
}
if !isUploadIDExists(storage, bucket, object, uploadID) {
return ListPartsInfo{}, InvalidUploadID{UploadID: uploadID}
}
// Hold lock so that there is no competing abort-multipart-upload or complete-multipart-upload.
nsMutex.Lock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object, uploadID))
defer nsMutex.Unlock(minioMetaBucket, pathJoin(mpartMetaPrefix, bucket, object, uploadID))
result := ListPartsInfo{}
entries, err := storage.ListDir(minioMetaBucket, path.Join(mpartMetaPrefix, bucket, object, uploadID))
if err != nil {
return result, err
}
sort.Strings(entries)
var newEntries []string
for _, entry := range entries {
newEntries = append(newEntries, path.Base(entry))
}
idx := sort.SearchStrings(newEntries, fmt.Sprintf("%.5d.", partNumberMarker+1))
newEntries = newEntries[idx:]
count := maxParts
for _, entry := range newEntries {
fi, err := storage.StatFile(minioMetaBucket, path.Join(mpartMetaPrefix, bucket, object, uploadID, entry))
splitEntry := strings.SplitN(entry, ".", 2)
partStr := splitEntry[0]
etagStr := splitEntry[1]
partNum, err := strconv.Atoi(partStr)
if err != nil {
return ListPartsInfo{}, err
}
result.Parts = append(result.Parts, partInfo{
PartNumber: partNum,
LastModified: fi.ModTime,
ETag: etagStr,
Size: fi.Size,
})
count--
if count == 0 {
break
}
}
// If listed entries are more than maxParts, we set IsTruncated as true.
if len(newEntries) > len(result.Parts) {
result.IsTruncated = true
// Make sure to fill next part number marker if IsTruncated is
// true for subsequent listing.
nextPartNumberMarker := result.Parts[len(result.Parts)-1].PartNumber
result.NextPartNumberMarker = nextPartNumberMarker
}
result.Bucket = bucket
result.Object = object
result.UploadID = uploadID
result.MaxParts = maxParts
return result, nil
}
// isUploadIDExists - verify if a given uploadID exists and is valid.
func isUploadIDExists(storage StorageAPI, bucket, object, uploadID string) bool {
uploadIDPath := path.Join(mpartMetaPrefix, bucket, object, uploadID, incompleteFile)
st, err := storage.StatFile(minioMetaBucket, uploadIDPath)
if err != nil {
if err == errFileNotFound {
return false
}
errorIf(err, "Stat failed on "+minioMetaBucket+"/"+uploadIDPath+".")
return false
}
return st.Mode.IsRegular()
}