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minio/cmd/fs-v1-multipart.go

700 lines
22 KiB

/*
* Minio Cloud Storage, (C) 2016, 2017 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 cmd
import (
"encoding/hex"
"encoding/json"
"fmt"
"io"
"io/ioutil"
"os"
pathutil "path"
"sort"
"strconv"
"strings"
"time"
"github.com/minio/minio/pkg/errors"
mioutil "github.com/minio/minio/pkg/ioutil"
"github.com/minio/minio/pkg/hash"
)
// Returns EXPORT/.minio.sys/multipart/SHA256/UPLOADID
func (fs *fsObjects) getUploadIDDir(bucket, object, uploadID string) string {
return pathJoin(fs.fsPath, minioMetaMultipartBucket, getSHA256Hash([]byte(pathJoin(bucket, object))), uploadID)
}
// Returns EXPORT/.minio.sys/multipart/SHA256
func (fs *fsObjects) getMultipartSHADir(bucket, object string) string {
return pathJoin(fs.fsPath, minioMetaMultipartBucket, getSHA256Hash([]byte(pathJoin(bucket, object))))
}
// Returns partNumber.etag
func (fs *fsObjects) encodePartFile(partNumber int, etag string) string {
return fmt.Sprintf("%.5d.%s", partNumber, etag)
}
// Returns partNumber and etag
func (fs *fsObjects) decodePartFile(name string) (partNumber int, etag string, err error) {
result := strings.Split(name, ".")
if len(result) != 2 {
return 0, "", errUnexpected
}
partNumber, err = strconv.Atoi(result[0])
if err != nil {
return 0, "", errUnexpected
}
return partNumber, result[1], nil
}
// Appends parts to an appendFile sequentially.
func (fs *fsObjects) backgroundAppend(bucket, object, uploadID string) {
fs.appendFileMapMu.Lock()
file := fs.appendFileMap[uploadID]
if file == nil {
file = &fsAppendFile{
filePath: pathJoin(fs.fsPath, minioMetaTmpBucket, fs.fsUUID, fmt.Sprintf("%s.%s", uploadID, mustGetUUID())),
}
fs.appendFileMap[uploadID] = file
}
fs.appendFileMapMu.Unlock()
file.Lock()
defer file.Unlock()
// Since we append sequentially nextPartNumber will always be len(file.parts)+1
nextPartNumber := len(file.parts) + 1
uploadIDDir := fs.getUploadIDDir(bucket, object, uploadID)
entries, err := readDir(uploadIDDir)
if err != nil {
errorIf(err, "error reading directory %s", uploadIDDir)
return
}
sort.Strings(entries)
for _, entry := range entries {
if entry == fsMetaJSONFile {
continue
}
partNumber, etag, err := fs.decodePartFile(entry)
if err != nil {
errorIf(err, "unable to split the file name into partNumber and etag: %s", entry)
return
}
if partNumber < nextPartNumber {
// Part already appended.
continue
}
if partNumber > nextPartNumber {
// Required part number is not yet uploaded.
return
}
partPath := pathJoin(uploadIDDir, entry)
err = mioutil.AppendFile(file.filePath, partPath)
if err != nil {
errorIf(err, "Unable to append %s to %s", partPath, file.filePath)
return
}
file.parts = append(file.parts, PartInfo{PartNumber: nextPartNumber, ETag: etag})
nextPartNumber++
}
}
// ListMultipartUploads - lists all the uploadIDs for the specified object.
// We do not support prefix based listing.
func (fs *fsObjects) ListMultipartUploads(bucket, object, keyMarker, uploadIDMarker, delimiter string, maxUploads int) (result ListMultipartsInfo, e error) {
if err := checkListMultipartArgs(bucket, object, keyMarker, uploadIDMarker, delimiter, fs); err != nil {
return result, toObjectErr(errors.Trace(err))
}
if _, err := fs.statBucketDir(bucket); err != nil {
return result, toObjectErr(errors.Trace(err), bucket)
}
result.MaxUploads = maxUploads
result.KeyMarker = keyMarker
result.Prefix = object
result.Delimiter = delimiter
result.NextKeyMarker = object
result.UploadIDMarker = uploadIDMarker
uploadIDs, err := readDir(fs.getMultipartSHADir(bucket, object))
if err != nil {
if err == errFileNotFound {
result.IsTruncated = false
return result, nil
}
return result, toObjectErr(errors.Trace(err))
}
// S3 spec says uploaIDs should be sorted based on initiated time. ModTime of fs.json
// is the creation time of the uploadID, hence we will use that.
var uploads []MultipartInfo
for _, uploadID := range uploadIDs {
metaFilePath := pathJoin(fs.getMultipartSHADir(bucket, object), uploadID, fsMetaJSONFile)
fi, err := fsStatFile(metaFilePath)
if err != nil {
return result, toObjectErr(err, bucket, object)
}
uploads = append(uploads, MultipartInfo{
Object: object,
UploadID: strings.TrimSuffix(uploadID, slashSeparator),
Initiated: fi.ModTime(),
})
}
sort.Slice(uploads, func(i int, j int) bool {
return uploads[i].Initiated.Before(uploads[j].Initiated)
})
uploadIndex := 0
if uploadIDMarker != "" {
for uploadIndex < len(uploads) {
if uploads[uploadIndex].UploadID != uploadIDMarker {
uploadIndex++
continue
}
if uploads[uploadIndex].UploadID == uploadIDMarker {
uploadIndex++
break
}
uploadIndex++
}
}
for uploadIndex < len(uploads) {
result.Uploads = append(result.Uploads, uploads[uploadIndex])
result.NextUploadIDMarker = uploads[uploadIndex].UploadID
uploadIndex++
if len(result.Uploads) == maxUploads {
break
}
}
result.IsTruncated = uploadIndex < len(uploads)
if !result.IsTruncated {
result.NextKeyMarker = ""
result.NextUploadIDMarker = ""
}
return result, nil
}
// NewMultipartUpload - initialize a new multipart upload, returns a
// unique id. The unique id returned here is of UUID form, for each
// subsequent request each UUID is unique.
//
// Implements S3 compatible initiate multipart API.
func (fs *fsObjects) NewMultipartUpload(bucket, object string, meta map[string]string) (string, error) {
if err := checkNewMultipartArgs(bucket, object, fs); err != nil {
return "", toObjectErr(err, bucket)
}
if _, err := fs.statBucketDir(bucket); err != nil {
return "", toObjectErr(err, bucket)
}
uploadID := mustGetUUID()
uploadIDDir := fs.getUploadIDDir(bucket, object, uploadID)
err := mkdirAll(uploadIDDir, 0755)
if err != nil {
return "", errors.Trace(err)
}
// Initialize fs.json values.
fsMeta := newFSMetaV1()
fsMeta.Meta = meta
fsMetaBytes, err := json.Marshal(fsMeta)
if err != nil {
return "", errors.Trace(err)
}
if err = ioutil.WriteFile(pathJoin(uploadIDDir, fsMetaJSONFile), fsMetaBytes, 0644); err != nil {
return "", errors.Trace(err)
}
return uploadID, nil
}
// CopyObjectPart - similar to PutObjectPart but reads data from an existing
// object. Internally incoming data is written to '.minio.sys/tmp' location
// and safely renamed to '.minio.sys/multipart' for reach parts.
func (fs *fsObjects) CopyObjectPart(srcBucket, srcObject, dstBucket, dstObject, uploadID string, partID int,
startOffset int64, length int64, metadata map[string]string, srcEtag string) (pi PartInfo, e error) {
if err := checkNewMultipartArgs(srcBucket, srcObject, fs); err != nil {
return pi, toObjectErr(errors.Trace(err))
}
// Initialize pipe.
pipeReader, pipeWriter := io.Pipe()
go func() {
if gerr := fs.GetObject(srcBucket, srcObject, startOffset, length, pipeWriter, srcEtag); gerr != nil {
errorIf(gerr, "Unable to read %s/%s.", srcBucket, srcObject)
pipeWriter.CloseWithError(gerr)
return
}
pipeWriter.Close() // Close writer explicitly signalling we wrote all data.
}()
hashReader, err := hash.NewReader(pipeReader, length, "", "")
if err != nil {
return pi, toObjectErr(err, dstBucket, dstObject)
}
partInfo, err := fs.PutObjectPart(dstBucket, dstObject, uploadID, partID, hashReader)
if err != nil {
return pi, toObjectErr(err, dstBucket, dstObject)
}
// Explicitly close the reader.
pipeReader.Close()
return partInfo, nil
}
// PutObjectPart - reads incoming data until EOF for the part file on
// an ongoing multipart transaction. Internally incoming data is
// written to '.minio.sys/tmp' location and safely renamed to
// '.minio.sys/multipart' for reach parts.
func (fs *fsObjects) PutObjectPart(bucket, object, uploadID string, partID int, data *hash.Reader) (pi PartInfo, e error) {
if err := checkPutObjectPartArgs(bucket, object, fs); err != nil {
return pi, toObjectErr(errors.Trace(err), bucket)
}
if _, err := fs.statBucketDir(bucket); err != nil {
return pi, toObjectErr(errors.Trace(err), bucket)
}
// Validate input data size and it can never be less than zero.
if data.Size() < 0 {
return pi, toObjectErr(errors.Trace(errInvalidArgument))
}
uploadIDDir := fs.getUploadIDDir(bucket, object, uploadID)
// Just check if the uploadID exists to avoid copy if it doesn't.
_, err := fsStatFile(pathJoin(uploadIDDir, fsMetaJSONFile))
if err != nil {
if errors.Cause(err) == errFileNotFound || errors.Cause(err) == errFileAccessDenied {
return pi, errors.Trace(InvalidUploadID{UploadID: uploadID})
}
return pi, toObjectErr(err, bucket, object)
}
bufSize := int64(readSizeV1)
if size := data.Size(); size > 0 && bufSize > size {
bufSize = size
}
buf := make([]byte, bufSize)
tmpPartPath := pathJoin(fs.fsPath, minioMetaTmpBucket, fs.fsUUID, uploadID+"."+mustGetUUID()+"."+strconv.Itoa(partID))
bytesWritten, err := fsCreateFile(tmpPartPath, data, buf, data.Size())
if err != nil {
fsRemoveFile(tmpPartPath)
return pi, toObjectErr(err, minioMetaTmpBucket, tmpPartPath)
}
// Should return IncompleteBody{} error when reader has fewer
// bytes than specified in request header.
if bytesWritten < data.Size() {
fsRemoveFile(tmpPartPath)
return pi, errors.Trace(IncompleteBody{})
}
// Delete temporary part in case of failure. If
// PutObjectPart succeeds then there would be nothing to
// delete in which case we just ignore the error.
defer fsRemoveFile(tmpPartPath)
etag := hex.EncodeToString(data.MD5Current())
if etag == "" {
etag = GenETag()
}
partPath := pathJoin(uploadIDDir, fs.encodePartFile(partID, etag))
if err = fsRenameFile(tmpPartPath, partPath); err != nil {
return pi, toObjectErr(err, minioMetaMultipartBucket, partPath)
}
go fs.backgroundAppend(bucket, object, uploadID)
fi, err := fsStatFile(partPath)
if err != nil {
return pi, toObjectErr(err, minioMetaMultipartBucket, partPath)
}
return PartInfo{
PartNumber: partID,
LastModified: fi.ModTime(),
ETag: etag,
Size: fi.Size(),
}, nil
}
// ListObjectParts - lists all previously uploaded parts for a given
// object and uploadID. Takes additional input of part-number-marker
// to indicate where the listing should begin from.
//
// Implements S3 compatible ListObjectParts API. The resulting
// ListPartsInfo structure is unmarshalled directly into XML and
// replied back to the client.
func (fs *fsObjects) ListObjectParts(bucket, object, uploadID string, partNumberMarker, maxParts int) (result ListPartsInfo, e error) {
if err := checkListPartsArgs(bucket, object, fs); err != nil {
return result, toObjectErr(errors.Trace(err))
}
result.Bucket = bucket
result.Object = object
result.UploadID = uploadID
result.MaxParts = maxParts
result.PartNumberMarker = partNumberMarker
// Check if bucket exists
if _, err := fs.statBucketDir(bucket); err != nil {
return result, toObjectErr(errors.Trace(err), bucket)
}
uploadIDDir := fs.getUploadIDDir(bucket, object, uploadID)
_, err := fsStatFile(pathJoin(uploadIDDir, fsMetaJSONFile))
if err != nil {
if errors.Cause(err) == errFileNotFound || errors.Cause(err) == errFileAccessDenied {
return result, errors.Trace(InvalidUploadID{UploadID: uploadID})
}
return result, toObjectErr(errors.Trace(err), bucket, object)
}
entries, err := readDir(uploadIDDir)
if err != nil {
return result, toObjectErr(errors.Trace(err), bucket)
}
partsMap := make(map[int]string)
for _, entry := range entries {
if entry == fsMetaJSONFile {
continue
}
partNumber, etag1, err := fs.decodePartFile(entry)
if err != nil {
return result, toObjectErr(errors.Trace(err))
}
etag2, ok := partsMap[partNumber]
if !ok {
partsMap[partNumber] = etag1
continue
}
stat1, err := fsStatFile(pathJoin(uploadIDDir, fs.encodePartFile(partNumber, etag1)))
if err != nil {
return result, toObjectErr(errors.Trace(err))
}
stat2, err := fsStatFile(pathJoin(uploadIDDir, fs.encodePartFile(partNumber, etag2)))
if err != nil {
return result, toObjectErr(errors.Trace(err))
}
if stat1.ModTime().After(stat2.ModTime()) {
partsMap[partNumber] = etag1
}
}
var parts []PartInfo
for partNumber, etag := range partsMap {
parts = append(parts, PartInfo{PartNumber: partNumber, ETag: etag})
}
sort.SliceStable(parts, func(i int, j int) bool {
return parts[i].PartNumber < parts[j].PartNumber
})
i := 0
if partNumberMarker != 0 {
// If the marker was set, skip the entries till the marker.
for _, part := range parts {
i++
if part.PartNumber == partNumberMarker {
break
}
}
}
partsCount := 0
for partsCount < maxParts && i < len(parts) {
result.Parts = append(result.Parts, parts[i])
i++
partsCount++
}
if i < len(parts) {
result.IsTruncated = true
if partsCount != 0 {
result.NextPartNumberMarker = result.Parts[partsCount-1].PartNumber
}
}
for i, part := range result.Parts {
stat, err := fsStatFile(pathJoin(uploadIDDir, fs.encodePartFile(part.PartNumber, part.ETag)))
if err != nil {
return result, toObjectErr(errors.Trace(err))
}
result.Parts[i].LastModified = stat.ModTime()
result.Parts[i].Size = stat.Size()
}
return result, nil
}
// CompleteMultipartUpload - completes an ongoing multipart
// transaction after receiving all the parts indicated by the client.
// Returns an md5sum calculated by concatenating all the individual
// md5sums of all the parts.
//
// Implements S3 compatible Complete multipart API.
func (fs *fsObjects) CompleteMultipartUpload(bucket string, object string, uploadID string, parts []CompletePart) (oi ObjectInfo, e error) {
if err := checkCompleteMultipartArgs(bucket, object, fs); err != nil {
return oi, toObjectErr(err)
}
// Check if an object is present as one of the parent dir.
if fs.parentDirIsObject(bucket, pathutil.Dir(object)) {
return oi, toObjectErr(errors.Trace(errFileAccessDenied), bucket, object)
}
if _, err := fs.statBucketDir(bucket); err != nil {
return oi, toObjectErr(err, bucket)
}
uploadIDDir := fs.getUploadIDDir(bucket, object, uploadID)
// Just check if the uploadID exists to avoid copy if it doesn't.
_, err := fsStatFile(pathJoin(uploadIDDir, fsMetaJSONFile))
if err != nil {
if errors.Cause(err) == errFileNotFound || errors.Cause(err) == errFileAccessDenied {
return oi, errors.Trace(InvalidUploadID{UploadID: uploadID})
}
return oi, toObjectErr(err, bucket, object)
}
// Calculate s3 compatible md5sum for complete multipart.
s3MD5, err := getCompleteMultipartMD5(parts)
if err != nil {
return oi, err
}
partSize := int64(-1) // Used later to ensure that all parts sizes are same.
// Validate all parts and then commit to disk.
for i, part := range parts {
partPath := pathJoin(uploadIDDir, fs.encodePartFile(part.PartNumber, part.ETag))
var fi os.FileInfo
fi, err = fsStatFile(partPath)
if err != nil {
if errors.Cause(err) == errFileNotFound || errors.Cause(err) == errFileAccessDenied {
return oi, errors.Trace(InvalidPart{})
}
return oi, errors.Trace(err)
}
if partSize == -1 {
partSize = fi.Size()
}
if i == len(parts)-1 {
break
}
// All parts except the last part has to be atleast 5MB.
if !isMinAllowedPartSize(fi.Size()) {
return oi, errors.Trace(PartTooSmall{
PartNumber: part.PartNumber,
PartSize: fi.Size(),
PartETag: part.ETag,
})
}
// TODO: Make necessary changes in future as explained in the below comment.
// All parts except the last part has to be of same size. We are introducing this
// check to see if any clients break. If clients do not break then we can optimize
// multipart PutObjectPart by writing the part at the right offset using pwrite()
// so that we don't need to do background append at all. i.e by the time we get
// CompleteMultipartUpload we already have the full file available which can be
// renamed to the main name-space.
if partSize != fi.Size() {
return oi, errors.Trace(PartsSizeUnequal{})
}
}
appendFallback := true // In case background-append did not append the required parts.
appendFilePath := pathJoin(fs.fsPath, minioMetaTmpBucket, fs.fsUUID, fmt.Sprintf("%s.%s", uploadID, mustGetUUID()))
// Most of the times appendFile would already be fully appended by now. We call fs.backgroundAppend()
// to take care of the following corner case:
// 1. The last PutObjectPart triggers go-routine fs.backgroundAppend, this go-routine has not started yet.
// 2. Now CompleteMultipartUpload gets called which sees that lastPart is not appended and starts appending
// from the beginning
fs.backgroundAppend(bucket, object, uploadID)
fs.appendFileMapMu.Lock()
file := fs.appendFileMap[uploadID]
delete(fs.appendFileMap, uploadID)
fs.appendFileMapMu.Unlock()
if file != nil {
file.Lock()
defer file.Unlock()
// Verify that appendFile has all the parts.
if len(file.parts) == len(parts) {
for i := range parts {
if parts[i].ETag != file.parts[i].ETag {
break
}
if parts[i].PartNumber != file.parts[i].PartNumber {
break
}
if i == len(parts)-1 {
appendFilePath = file.filePath
appendFallback = false
}
}
}
}
if appendFallback {
fsRemoveFile(file.filePath)
for _, part := range parts {
partPath := pathJoin(uploadIDDir, fs.encodePartFile(part.PartNumber, part.ETag))
err = mioutil.AppendFile(appendFilePath, partPath)
if err != nil {
return oi, toObjectErr(errors.Trace(err))
}
}
}
// Hold write lock on the object.
destLock := fs.nsMutex.NewNSLock(bucket, object)
if err = destLock.GetLock(globalObjectTimeout); err != nil {
return oi, err
}
defer destLock.Unlock()
fsMetaPath := pathJoin(fs.fsPath, minioMetaBucket, bucketMetaPrefix, bucket, object, fsMetaJSONFile)
metaFile, err := fs.rwPool.Create(fsMetaPath)
if err != nil {
return oi, toObjectErr(errors.Trace(err), bucket, object)
}
defer metaFile.Close()
fsMeta := fsMetaV1{}
// Read saved fs metadata for ongoing multipart.
fsMetaBuf, err := ioutil.ReadFile(pathJoin(uploadIDDir, fsMetaJSONFile))
if err != nil {
return oi, toObjectErr(errors.Trace(err), bucket, object)
}
err = json.Unmarshal(fsMetaBuf, &fsMeta)
if err != nil {
return oi, toObjectErr(errors.Trace(err), bucket, object)
}
// Save additional metadata.
if len(fsMeta.Meta) == 0 {
fsMeta.Meta = make(map[string]string)
}
fsMeta.Meta["etag"] = s3MD5
if _, err = fsMeta.WriteTo(metaFile); err != nil {
return oi, toObjectErr(errors.Trace(err), bucket, object)
}
err = fsRenameFile(appendFilePath, pathJoin(fs.fsPath, bucket, object))
if err != nil {
return oi, toObjectErr(errors.Trace(err), bucket, object)
}
fsRemoveAll(uploadIDDir)
fi, err := fsStatFile(pathJoin(fs.fsPath, bucket, object))
if err != nil {
return oi, toObjectErr(errors.Trace(err), bucket, object)
}
return fsMeta.ToObjectInfo(bucket, object, fi), nil
}
// AbortMultipartUpload - aborts an ongoing multipart operation
// signified by the input uploadID. This is an atomic operation
// doesn't require clients to initiate multiple such requests.
//
// All parts are purged from all disks and reference to the uploadID
// would be removed from the system, rollback is not possible on this
// operation.
//
// Implements S3 compatible Abort multipart API, slight difference is
// that this is an atomic idempotent operation. Subsequent calls have
// no affect and further requests to the same uploadID would not be
// honored.
func (fs *fsObjects) AbortMultipartUpload(bucket, object, uploadID string) error {
if err := checkAbortMultipartArgs(bucket, object, fs); err != nil {
return err
}
if _, err := fs.statBucketDir(bucket); err != nil {
return toObjectErr(errors.Trace(err), bucket)
}
fs.appendFileMapMu.Lock()
delete(fs.appendFileMap, uploadID)
fs.appendFileMapMu.Unlock()
uploadIDDir := fs.getUploadIDDir(bucket, object, uploadID)
// Just check if the uploadID exists to avoid copy if it doesn't.
_, err := fsStatFile(pathJoin(uploadIDDir, fsMetaJSONFile))
if err != nil {
if errors.Cause(err) == errFileNotFound || errors.Cause(err) == errFileAccessDenied {
return errors.Trace(InvalidUploadID{UploadID: uploadID})
}
return toObjectErr(errors.Trace(err), bucket, object)
}
// Ignore the error returned as Windows fails to remove directory if a file in it
// is Open()ed by the backgroundAppend()
fsRemoveAll(uploadIDDir)
return nil
}
// Removes multipart uploads if any older than `expiry` duration
// on all buckets for every `cleanupInterval`, this function is
// blocking and should be run in a go-routine.
func (fs *fsObjects) cleanupStaleMultipartUploads(cleanupInterval, expiry time.Duration, doneCh chan struct{}) {
ticker := time.NewTicker(cleanupInterval)
for {
select {
case <-doneCh:
// Stop the timer.
ticker.Stop()
return
case <-ticker.C:
now := time.Now()
entries, err := readDir(pathJoin(fs.fsPath, minioMetaMultipartBucket))
if err != nil {
continue
}
for _, entry := range entries {
uploadIDs, err := readDir(pathJoin(fs.fsPath, minioMetaMultipartBucket, entry))
if err != nil {
continue
}
for _, uploadID := range uploadIDs {
fi, err := fsStatDir(pathJoin(fs.fsPath, minioMetaMultipartBucket, entry, uploadID))
if err != nil {
continue
}
if now.Sub(fi.ModTime()) > expiry {
fsRemoveAll(pathJoin(fs.fsPath, minioMetaMultipartBucket, entry, uploadID))
}
}
}
}
}
}