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minio/cmd/xl-v1-object.go

927 lines
30 KiB

/*
* Minio Cloud Storage, (C) 2016, 2017, 2018 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 (
"bytes"
"context"
"io"
"net/http"
"path"
"strconv"
"sync"
"github.com/minio/minio/cmd/logger"
"github.com/minio/minio/pkg/hash"
"github.com/minio/minio/pkg/mimedb"
)
// list all errors which can be ignored in object operations.
var objectOpIgnoredErrs = append(baseIgnoredErrs, errDiskAccessDenied)
// putObjectDir hints the bottom layer to create a new directory.
func (xl xlObjects) putObjectDir(ctx context.Context, bucket, object string, writeQuorum int) error {
var wg = &sync.WaitGroup{}
errs := make([]error, len(xl.getDisks()))
// Prepare object creation in all disks
for index, disk := range xl.getDisks() {
if disk == nil {
continue
}
wg.Add(1)
go func(index int, disk StorageAPI) {
defer wg.Done()
if err := disk.MakeVol(pathJoin(bucket, object)); err != nil && err != errVolumeExists {
errs[index] = err
}
}(index, disk)
}
wg.Wait()
return reduceWriteQuorumErrs(ctx, errs, objectOpIgnoredErrs, writeQuorum)
}
/// Object Operations
// CopyObject - copy object source object to destination object.
// if source object and destination object are same we only
// update metadata.
func (xl xlObjects) CopyObject(ctx context.Context, srcBucket, srcObject, dstBucket, dstObject string, srcInfo ObjectInfo, srcOpts, dstOpts ObjectOptions) (oi ObjectInfo, e error) {
cpSrcDstSame := isStringEqual(pathJoin(srcBucket, srcObject), pathJoin(dstBucket, dstObject))
// Read metadata associated with the object from all disks.
storageDisks := xl.getDisks()
metaArr, errs := readAllXLMetadata(ctx, storageDisks, srcBucket, srcObject)
// get Quorum for this object
readQuorum, writeQuorum, err := objectQuorumFromMeta(ctx, xl, metaArr, errs)
if err != nil {
return oi, toObjectErr(err, srcBucket, srcObject)
}
if reducedErr := reduceReadQuorumErrs(ctx, errs, objectOpIgnoredErrs, readQuorum); reducedErr != nil {
return oi, toObjectErr(reducedErr, srcBucket, srcObject)
}
// List all online disks.
_, modTime := listOnlineDisks(storageDisks, metaArr, errs)
// Pick latest valid metadata.
xlMeta, err := pickValidXLMeta(ctx, metaArr, modTime, readQuorum)
if err != nil {
return oi, toObjectErr(err, srcBucket, srcObject)
}
// Length of the file to read.
length := xlMeta.Stat.Size
// Check if this request is only metadata update.
if cpSrcDstSame {
// Update `xl.json` content on each disks.
for index := range metaArr {
metaArr[index].Meta = srcInfo.UserDefined
metaArr[index].Meta["etag"] = srcInfo.ETag
}
var onlineDisks []StorageAPI
tempObj := mustGetUUID()
// Write unique `xl.json` for each disk.
if onlineDisks, err = writeUniqueXLMetadata(ctx, storageDisks, minioMetaTmpBucket, tempObj, metaArr, writeQuorum); err != nil {
return oi, toObjectErr(err, srcBucket, srcObject)
}
// Rename atomically `xl.json` from tmp location to destination for each disk.
if _, err = renameXLMetadata(ctx, onlineDisks, minioMetaTmpBucket, tempObj, srcBucket, srcObject, writeQuorum); err != nil {
return oi, toObjectErr(err, srcBucket, srcObject)
}
return xlMeta.ToObjectInfo(srcBucket, srcObject), nil
}
// Initialize pipe.
pipeReader, pipeWriter := io.Pipe()
go func() {
var startOffset int64 // Read the whole file.
if gerr := xl.getObject(ctx, srcBucket, srcObject, startOffset, length, pipeWriter, srcInfo.ETag, srcOpts); gerr != nil {
pipeWriter.CloseWithError(toObjectErr(gerr, srcBucket, srcObject))
return
}
pipeWriter.Close() // Close writer explicitly signaling we wrote all data.
}()
hashReader, err := hash.NewReader(pipeReader, length, "", "", length)
if err != nil {
logger.LogIf(ctx, err)
return oi, toObjectErr(err, dstBucket, dstObject)
}
putOpts := ObjectOptions{UserDefined: srcInfo.UserDefined, ServerSideEncryption: dstOpts.ServerSideEncryption}
objInfo, err := xl.putObject(ctx, dstBucket, dstObject, NewPutObjReader(hashReader, nil, nil), putOpts)
if err != nil {
return oi, toObjectErr(err, dstBucket, dstObject)
}
// Explicitly close the reader.
pipeReader.Close()
return objInfo, nil
}
// GetObjectNInfo - returns object info and an object
// Read(Closer). When err != nil, the returned reader is always nil.
func (xl xlObjects) GetObjectNInfo(ctx context.Context, bucket, object string, rs *HTTPRangeSpec, h http.Header, lockType LockType, opts ObjectOptions) (gr *GetObjectReader, err error) {
var nsUnlocker = func() {}
// Acquire lock
if lockType != noLock {
lock := xl.nsMutex.NewNSLock(bucket, object)
switch lockType {
case writeLock:
if err = lock.GetLock(globalObjectTimeout); err != nil {
return nil, err
}
nsUnlocker = lock.Unlock
case readLock:
if err = lock.GetRLock(globalObjectTimeout); err != nil {
return nil, err
}
nsUnlocker = lock.RUnlock
}
}
if err = checkGetObjArgs(ctx, bucket, object); err != nil {
nsUnlocker()
return nil, err
}
// Handler directory request by returning a reader that
// returns no bytes.
if hasSuffix(object, slashSeparator) {
if !xl.isObjectDir(bucket, object) {
nsUnlocker()
return nil, toObjectErr(errFileNotFound, bucket, object)
}
var objInfo ObjectInfo
if objInfo, err = xl.getObjectInfoDir(ctx, bucket, object); err != nil {
nsUnlocker()
return nil, toObjectErr(err, bucket, object)
}
return NewGetObjectReaderFromReader(bytes.NewBuffer(nil), objInfo, opts.CheckCopyPrecondFn, nsUnlocker)
}
var objInfo ObjectInfo
objInfo, err = xl.getObjectInfo(ctx, bucket, object)
if err != nil {
nsUnlocker()
return nil, toObjectErr(err, bucket, object)
}
fn, off, length, nErr := NewGetObjectReader(rs, objInfo, opts.CheckCopyPrecondFn, nsUnlocker)
if nErr != nil {
return nil, nErr
}
pr, pw := io.Pipe()
go func() {
err := xl.getObject(ctx, bucket, object, off, length, pw, "", opts)
pw.CloseWithError(err)
}()
// Cleanup function to cause the go routine above to exit, in
// case of incomplete read.
pipeCloser := func() { pr.Close() }
return fn(pr, h, opts.CheckCopyPrecondFn, pipeCloser)
}
// GetObject - reads an object erasured coded across multiple
// disks. Supports additional parameters like offset and length
// which are synonymous with HTTP Range requests.
//
// startOffset indicates the starting read location of the object.
// length indicates the total length of the object.
func (xl xlObjects) GetObject(ctx context.Context, bucket, object string, startOffset int64, length int64, writer io.Writer, etag string, opts ObjectOptions) error {
// Lock the object before reading.
objectLock := xl.nsMutex.NewNSLock(bucket, object)
if err := objectLock.GetRLock(globalObjectTimeout); err != nil {
return err
}
defer objectLock.RUnlock()
return xl.getObject(ctx, bucket, object, startOffset, length, writer, etag, opts)
}
// getObject wrapper for xl GetObject
func (xl xlObjects) getObject(ctx context.Context, bucket, object string, startOffset int64, length int64, writer io.Writer, etag string, opts ObjectOptions) error {
if err := checkGetObjArgs(ctx, bucket, object); err != nil {
return err
}
// Start offset cannot be negative.
if startOffset < 0 {
logger.LogIf(ctx, errUnexpected)
return errUnexpected
}
// Writer cannot be nil.
if writer == nil {
logger.LogIf(ctx, errUnexpected)
return errUnexpected
}
// If its a directory request, we return an empty body.
if hasSuffix(object, slashSeparator) {
_, err := writer.Write([]byte(""))
logger.LogIf(ctx, err)
return toObjectErr(err, bucket, object)
}
// Read metadata associated with the object from all disks.
metaArr, errs := readAllXLMetadata(ctx, xl.getDisks(), bucket, object)
// get Quorum for this object
readQuorum, _, err := objectQuorumFromMeta(ctx, xl, metaArr, errs)
if err != nil {
return toObjectErr(err, bucket, object)
}
if reducedErr := reduceReadQuorumErrs(ctx, errs, objectOpIgnoredErrs, readQuorum); reducedErr != nil {
return toObjectErr(reducedErr, bucket, object)
}
// List all online disks.
onlineDisks, modTime := listOnlineDisks(xl.getDisks(), metaArr, errs)
// Pick latest valid metadata.
xlMeta, err := pickValidXLMeta(ctx, metaArr, modTime, readQuorum)
if err != nil {
return err
}
// Reorder online disks based on erasure distribution order.
onlineDisks = shuffleDisks(onlineDisks, xlMeta.Erasure.Distribution)
// Reorder parts metadata based on erasure distribution order.
metaArr = shufflePartsMetadata(metaArr, xlMeta.Erasure.Distribution)
// For negative length read everything.
if length < 0 {
length = xlMeta.Stat.Size - startOffset
}
// Reply back invalid range if the input offset and length fall out of range.
if startOffset > xlMeta.Stat.Size || startOffset+length > xlMeta.Stat.Size {
logger.LogIf(ctx, InvalidRange{startOffset, length, xlMeta.Stat.Size})
return InvalidRange{startOffset, length, xlMeta.Stat.Size}
}
// Get start part index and offset.
partIndex, partOffset, err := xlMeta.ObjectToPartOffset(ctx, startOffset)
if err != nil {
return InvalidRange{startOffset, length, xlMeta.Stat.Size}
}
// Calculate endOffset according to length
endOffset := startOffset
if length > 0 {
endOffset += length - 1
}
// Get last part index to read given length.
lastPartIndex, _, err := xlMeta.ObjectToPartOffset(ctx, endOffset)
if err != nil {
return InvalidRange{startOffset, length, xlMeta.Stat.Size}
}
var totalBytesRead int64
erasure, err := NewErasure(ctx, xlMeta.Erasure.DataBlocks, xlMeta.Erasure.ParityBlocks, xlMeta.Erasure.BlockSize)
if err != nil {
return toObjectErr(err, bucket, object)
}
for ; partIndex <= lastPartIndex; partIndex++ {
if length == totalBytesRead {
break
}
// Save the current part name and size.
partName := xlMeta.Parts[partIndex].Name
partSize := xlMeta.Parts[partIndex].Size
partLength := partSize - partOffset
// partLength should be adjusted so that we don't write more data than what was requested.
if partLength > (length - totalBytesRead) {
partLength = length - totalBytesRead
}
tillOffset := erasure.ShardFileTillOffset(partOffset, partLength, partSize)
// Get the checksums of the current part.
readers := make([]io.ReaderAt, len(onlineDisks))
for index, disk := range onlineDisks {
if disk == OfflineDisk {
continue
}
checksumInfo := metaArr[index].Erasure.GetChecksumInfo(partName)
readers[index] = newBitrotReader(disk, bucket, pathJoin(object, partName), tillOffset, checksumInfo.Algorithm, checksumInfo.Hash, erasure.ShardSize())
}
err := erasure.Decode(ctx, writer, readers, partOffset, partLength, partSize)
// Note: we should not be defer'ing the following closeBitrotReaders() call as we are inside a for loop i.e if we use defer, we would accumulate a lot of open files by the time
// we return from this function.
closeBitrotReaders(readers)
if err != nil {
return toObjectErr(err, bucket, object)
}
for i, r := range readers {
if r == nil {
onlineDisks[i] = OfflineDisk
}
}
// Track total bytes read from disk and written to the client.
totalBytesRead += partLength
// partOffset will be valid only for the first part, hence reset it to 0 for
// the remaining parts.
partOffset = 0
} // End of read all parts loop.
// Return success.
return nil
}
// getObjectInfoDir - This getObjectInfo is specific to object directory lookup.
func (xl xlObjects) getObjectInfoDir(ctx context.Context, bucket, object string) (oi ObjectInfo, err error) {
var wg = &sync.WaitGroup{}
errs := make([]error, len(xl.getDisks()))
// Prepare object creation in a all disks
for index, disk := range xl.getDisks() {
if disk == nil {
continue
}
wg.Add(1)
go func(index int, disk StorageAPI) {
defer wg.Done()
if _, err := disk.StatVol(pathJoin(bucket, object)); err != nil {
// Since we are re-purposing StatVol, an object which
// is a directory if it doesn't exist should be
// returned as errFileNotFound instead, convert
// the error right here accordingly.
if err == errVolumeNotFound {
err = errFileNotFound
} else if err == errVolumeAccessDenied {
err = errFileAccessDenied
}
// Save error to reduce it later
errs[index] = err
}
}(index, disk)
}
wg.Wait()
readQuorum := len(xl.getDisks()) / 2
return dirObjectInfo(bucket, object, 0, map[string]string{}), reduceReadQuorumErrs(ctx, errs, objectOpIgnoredErrs, readQuorum)
}
// GetObjectInfo - reads object metadata and replies back ObjectInfo.
func (xl xlObjects) GetObjectInfo(ctx context.Context, bucket, object string, opts ObjectOptions) (oi ObjectInfo, e error) {
// Lock the object before reading.
objectLock := xl.nsMutex.NewNSLock(bucket, object)
if err := objectLock.GetRLock(globalObjectTimeout); err != nil {
return oi, err
}
defer objectLock.RUnlock()
if err := checkGetObjArgs(ctx, bucket, object); err != nil {
return oi, err
}
if hasSuffix(object, slashSeparator) {
if !xl.isObjectDir(bucket, object) {
return oi, toObjectErr(errFileNotFound, bucket, object)
}
if oi, e = xl.getObjectInfoDir(ctx, bucket, object); e != nil {
return oi, toObjectErr(e, bucket, object)
}
return oi, nil
}
info, err := xl.getObjectInfo(ctx, bucket, object)
if err != nil {
return oi, toObjectErr(err, bucket, object)
}
return info, nil
}
// getObjectInfo - wrapper for reading object metadata and constructs ObjectInfo.
func (xl xlObjects) getObjectInfo(ctx context.Context, bucket, object string) (objInfo ObjectInfo, err error) {
disks := xl.getDisks()
// Read metadata associated with the object from all disks.
metaArr, errs := readAllXLMetadata(ctx, disks, bucket, object)
readQuorum, _, err := objectQuorumFromMeta(ctx, xl, metaArr, errs)
if err != nil {
return objInfo, err
}
// List all the file commit ids from parts metadata.
modTimes := listObjectModtimes(metaArr, errs)
// Reduce list of UUIDs to a single common value.
modTime, _ := commonTime(modTimes)
// Pick latest valid metadata.
xlMeta, err := pickValidXLMeta(ctx, metaArr, modTime, readQuorum)
if err != nil {
return objInfo, err
}
return xlMeta.ToObjectInfo(bucket, object), nil
}
func undoRename(disks []StorageAPI, srcBucket, srcEntry, dstBucket, dstEntry string, isDir bool, errs []error) {
var wg = &sync.WaitGroup{}
// Undo rename object on disks where RenameFile succeeded.
// If srcEntry/dstEntry are objects then add a trailing slash to copy
// over all the parts inside the object directory
if isDir {
srcEntry = retainSlash(srcEntry)
dstEntry = retainSlash(dstEntry)
}
for index, disk := range disks {
if disk == nil {
continue
}
// Undo rename object in parallel.
wg.Add(1)
go func(index int, disk StorageAPI) {
defer wg.Done()
if errs[index] != nil {
return
}
_ = disk.RenameFile(dstBucket, dstEntry, srcBucket, srcEntry)
}(index, disk)
}
wg.Wait()
}
// rename - common function that renamePart and renameObject use to rename
// the respective underlying storage layer representations.
func rename(ctx context.Context, disks []StorageAPI, srcBucket, srcEntry, dstBucket, dstEntry string, isDir bool, writeQuorum int, ignoredErr []error) ([]StorageAPI, error) {
// Initialize sync waitgroup.
var wg = &sync.WaitGroup{}
// Initialize list of errors.
var errs = make([]error, len(disks))
if isDir {
dstEntry = retainSlash(dstEntry)
srcEntry = retainSlash(srcEntry)
}
// Rename file on all underlying storage disks.
for index, disk := range disks {
if disk == nil {
errs[index] = errDiskNotFound
continue
}
wg.Add(1)
go func(index int, disk StorageAPI) {
defer wg.Done()
if err := disk.RenameFile(srcBucket, srcEntry, dstBucket, dstEntry); err != nil {
if !IsErrIgnored(err, ignoredErr...) {
errs[index] = err
}
}
}(index, disk)
}
// Wait for all renames to finish.
wg.Wait()
// We can safely allow RenameFile errors up to len(xl.getDisks()) - writeQuorum
// otherwise return failure. Cleanup successful renames.
err := reduceWriteQuorumErrs(ctx, errs, objectOpIgnoredErrs, writeQuorum)
if err == errXLWriteQuorum {
// Undo all the partial rename operations.
undoRename(disks, srcBucket, srcEntry, dstBucket, dstEntry, isDir, errs)
}
return evalDisks(disks, errs), err
}
// PutObject - creates an object upon reading from the input stream
// until EOF, erasure codes the data across all disk and additionally
// writes `xl.json` which carries the necessary metadata for future
// object operations.
func (xl xlObjects) PutObject(ctx context.Context, bucket string, object string, data *PutObjReader, opts ObjectOptions) (objInfo ObjectInfo, err error) {
// Validate put object input args.
if err = checkPutObjectArgs(ctx, bucket, object, xl, data.Size()); err != nil {
return ObjectInfo{}, err
}
// Lock the object.
objectLock := xl.nsMutex.NewNSLock(bucket, object)
if err := objectLock.GetLock(globalObjectTimeout); err != nil {
return objInfo, err
}
defer objectLock.Unlock()
return xl.putObject(ctx, bucket, object, data, opts)
}
// putObject wrapper for xl PutObject
func (xl xlObjects) putObject(ctx context.Context, bucket string, object string, r *PutObjReader, opts ObjectOptions) (objInfo ObjectInfo, err error) {
data := r.Reader
uniqueID := mustGetUUID()
tempObj := uniqueID
// No metadata is set, allocate a new one.
if opts.UserDefined == nil {
opts.UserDefined = make(map[string]string)
}
// Get parity and data drive count based on storage class metadata
dataDrives, parityDrives := getRedundancyCount(opts.UserDefined[amzStorageClass], len(xl.getDisks()))
// we now know the number of blocks this object needs for data and parity.
// writeQuorum is dataBlocks + 1
writeQuorum := dataDrives + 1
// Delete temporary object in the event of failure.
// If PutObject succeeded there would be no temporary
// object to delete.
defer xl.deleteObject(ctx, minioMetaTmpBucket, tempObj, writeQuorum, false)
// This is a special case with size as '0' and object ends with
// a slash separator, we treat it like a valid operation and
// return success.
if isObjectDir(object, data.Size()) {
// Check if an object is present as one of the parent dir.
// -- FIXME. (needs a new kind of lock).
// -- FIXME (this also causes performance issue when disks are down).
if xl.parentDirIsObject(ctx, bucket, path.Dir(object)) {
return ObjectInfo{}, toObjectErr(errFileParentIsFile, bucket, object)
}
if err = xl.putObjectDir(ctx, minioMetaTmpBucket, tempObj, writeQuorum); err != nil {
return ObjectInfo{}, toObjectErr(err, bucket, object)
}
// Rename the successfully written temporary object to final location. Ignore errFileAccessDenied
// error because it means that the target object dir exists and we want to be close to S3 specification.
if _, err = rename(ctx, xl.getDisks(), minioMetaTmpBucket, tempObj, bucket, object, true, writeQuorum, []error{errFileAccessDenied}); err != nil {
return ObjectInfo{}, toObjectErr(err, bucket, object)
}
return dirObjectInfo(bucket, object, data.Size(), opts.UserDefined), nil
}
// Validate put object input args.
if err = checkPutObjectArgs(ctx, bucket, object, xl, data.Size()); err != nil {
return ObjectInfo{}, err
}
// Validate input data size and it can never be less than zero.
if data.Size() < -1 {
logger.LogIf(ctx, errInvalidArgument)
return ObjectInfo{}, toObjectErr(errInvalidArgument)
}
// Check if an object is present as one of the parent dir.
// -- FIXME. (needs a new kind of lock).
// -- FIXME (this also causes performance issue when disks are down).
if xl.parentDirIsObject(ctx, bucket, path.Dir(object)) {
return ObjectInfo{}, toObjectErr(errFileParentIsFile, bucket, object)
}
// Limit the reader to its provided size if specified.
var reader io.Reader = data
// Initialize parts metadata
partsMetadata := make([]xlMetaV1, len(xl.getDisks()))
xlMeta := newXLMetaV1(object, dataDrives, parityDrives)
// Initialize xl meta.
for index := range partsMetadata {
partsMetadata[index] = xlMeta
}
// Order disks according to erasure distribution
onlineDisks := shuffleDisks(xl.getDisks(), partsMetadata[0].Erasure.Distribution)
// Total size of the written object
var sizeWritten int64
erasure, err := NewErasure(ctx, xlMeta.Erasure.DataBlocks, xlMeta.Erasure.ParityBlocks, xlMeta.Erasure.BlockSize)
if err != nil {
return ObjectInfo{}, toObjectErr(err, bucket, object)
}
// Fetch buffer for I/O, returns from the pool if not allocates a new one and returns.
var buffer []byte
switch size := data.Size(); {
case size == 0:
buffer = make([]byte, 1) // Allocate atleast a byte to reach EOF
case size == -1 || size >= blockSizeV1:
buffer = xl.bp.Get()
defer xl.bp.Put(buffer)
case size < blockSizeV1:
// No need to allocate fully blockSizeV1 buffer if the incoming data is smaller.
buffer = make([]byte, size, 2*size)
}
if len(buffer) > int(xlMeta.Erasure.BlockSize) {
buffer = buffer[:xlMeta.Erasure.BlockSize]
}
// Read data and split into parts - similar to multipart mechanism
for partIdx := 1; ; partIdx++ {
// Compute part name
partName := "part." + strconv.Itoa(partIdx)
// Compute the path of current part
tempErasureObj := pathJoin(uniqueID, partName)
// Calculate the size of the current part.
var curPartSize int64
curPartSize, err = calculatePartSizeFromIdx(ctx, data.Size(), globalPutPartSize, partIdx)
if err != nil {
logger.LogIf(ctx, err)
return ObjectInfo{}, toObjectErr(err, bucket, object)
}
// Hint the filesystem to pre-allocate one continuous large block.
// This is only an optimization.
var curPartReader io.Reader
if curPartSize < data.Size() {
curPartReader = io.LimitReader(reader, curPartSize)
} else {
curPartReader = reader
}
writers := make([]io.Writer, len(onlineDisks))
for i, disk := range onlineDisks {
if disk == nil {
continue
}
writers[i] = newBitrotWriter(disk, minioMetaTmpBucket, tempErasureObj, erasure.ShardFileSize(curPartSize), DefaultBitrotAlgorithm, erasure.ShardSize())
}
n, erasureErr := erasure.Encode(ctx, curPartReader, writers, buffer, erasure.dataBlocks+1)
// Note: we should not be defer'ing the following closeBitrotWriters() call as we are inside a for loop i.e if we use defer, we would accumulate a lot of open files by the time
// we return from this function.
closeBitrotWriters(writers)
if erasureErr != nil {
return ObjectInfo{}, toObjectErr(erasureErr, minioMetaTmpBucket, tempErasureObj)
}
// Should return IncompleteBody{} error when reader has fewer bytes
// than specified in request header.
if n < curPartSize && data.Size() > 0 {
logger.LogIf(ctx, IncompleteBody{})
return ObjectInfo{}, IncompleteBody{}
}
if n == 0 && data.Size() == -1 {
// The last part of a compressed object will always be empty
// Since the compressed size is unpredictable.
// Hence removing the last (empty) part from all `xl.disks`.
dErr := xl.deleteObject(ctx, minioMetaTmpBucket, tempErasureObj, writeQuorum, true)
if dErr != nil {
return ObjectInfo{}, toObjectErr(dErr, minioMetaTmpBucket, tempErasureObj)
}
break
}
// Update the total written size
sizeWritten += n
for i, w := range writers {
if w == nil {
onlineDisks[i] = nil
continue
}
partsMetadata[i].AddObjectPart(partIdx, partName, "", n, data.ActualSize())
partsMetadata[i].Erasure.AddChecksumInfo(ChecksumInfo{partName, DefaultBitrotAlgorithm, bitrotWriterSum(w)})
}
// We wrote everything, break out.
if sizeWritten == data.Size() {
break
}
}
// Save additional erasureMetadata.
modTime := UTCNow()
opts.UserDefined["etag"] = r.MD5CurrentHexString()
// Guess content-type from the extension if possible.
if opts.UserDefined["content-type"] == "" {
opts.UserDefined["content-type"] = mimedb.TypeByExtension(path.Ext(object))
}
if xl.isObject(bucket, object) {
// Deny if WORM is enabled
if globalWORMEnabled {
return ObjectInfo{}, ObjectAlreadyExists{Bucket: bucket, Object: object}
}
// Rename if an object already exists to temporary location.
newUniqueID := mustGetUUID()
// Delete successfully renamed object.
defer xl.deleteObject(ctx, minioMetaTmpBucket, newUniqueID, writeQuorum, false)
// NOTE: Do not use online disks slice here: the reason is that existing object should be purged
// regardless of `xl.json` status and rolled back in case of errors. Also allow renaming the
// existing object if it is not present in quorum disks so users can overwrite stale objects.
_, err = rename(ctx, xl.getDisks(), bucket, object, minioMetaTmpBucket, newUniqueID, true, writeQuorum, []error{errFileNotFound})
if err != nil {
return ObjectInfo{}, toObjectErr(err, bucket, object)
}
}
// Fill all the necessary metadata.
// Update `xl.json` content on each disks.
for index := range partsMetadata {
partsMetadata[index].Meta = opts.UserDefined
partsMetadata[index].Stat.Size = sizeWritten
partsMetadata[index].Stat.ModTime = modTime
}
// Write unique `xl.json` for each disk.
if onlineDisks, err = writeUniqueXLMetadata(ctx, onlineDisks, minioMetaTmpBucket, tempObj, partsMetadata, writeQuorum); err != nil {
return ObjectInfo{}, toObjectErr(err, bucket, object)
}
// Rename the successfully written temporary object to final location.
if _, err = rename(ctx, onlineDisks, minioMetaTmpBucket, tempObj, bucket, object, true, writeQuorum, nil); err != nil {
return ObjectInfo{}, toObjectErr(err, bucket, object)
}
// Object info is the same in all disks, so we can pick the first meta
// of the first disk
xlMeta = partsMetadata[0]
objInfo = ObjectInfo{
IsDir: false,
Bucket: bucket,
Name: object,
Size: xlMeta.Stat.Size,
ModTime: xlMeta.Stat.ModTime,
ETag: xlMeta.Meta["etag"],
ContentType: xlMeta.Meta["content-type"],
ContentEncoding: xlMeta.Meta["content-encoding"],
UserDefined: xlMeta.Meta,
}
// Success, return object info.
return objInfo, nil
}
// deleteObject - wrapper for delete object, deletes an object from
// all the disks in parallel, including `xl.json` associated with the
// object.
func (xl xlObjects) deleteObject(ctx context.Context, bucket, object string, writeQuorum int, isDir bool) error {
var disks []StorageAPI
var err error
tmpObj := mustGetUUID()
if bucket == minioMetaTmpBucket {
tmpObj = object
disks = xl.getDisks()
} else {
// Rename the current object while requiring write quorum, but also consider
// that a non found object in a given disk as a success since it already
// confirms that the object doesn't have a part in that disk (already removed)
if isDir {
disks, err = rename(ctx, xl.getDisks(), bucket, object, minioMetaTmpBucket, tmpObj, true, writeQuorum,
[]error{errFileNotFound, errFileAccessDenied})
} else {
disks, err = rename(ctx, xl.getDisks(), bucket, object, minioMetaTmpBucket, tmpObj, true, writeQuorum,
[]error{errFileNotFound})
}
if err != nil {
return toObjectErr(err, bucket, object)
}
}
// Initialize sync waitgroup.
var wg = &sync.WaitGroup{}
// Initialize list of errors.
var dErrs = make([]error, len(disks))
for index, disk := range disks {
if disk == nil {
dErrs[index] = errDiskNotFound
continue
}
wg.Add(1)
go func(index int, disk StorageAPI, isDir bool) {
defer wg.Done()
var e error
if isDir {
// DeleteFile() simply tries to remove a directory
// and will succeed only if that directory is empty.
e = disk.DeleteFile(minioMetaTmpBucket, tmpObj)
} else {
e = cleanupDir(ctx, disk, minioMetaTmpBucket, tmpObj)
}
if e != nil && e != errVolumeNotFound {
dErrs[index] = e
}
}(index, disk, isDir)
}
// Wait for all routines to finish.
wg.Wait()
// return errors if any during deletion
return reduceWriteQuorumErrs(ctx, dErrs, objectOpIgnoredErrs, writeQuorum)
}
// DeleteObject - deletes an object, this call doesn't necessary reply
// any error as it is not necessary for the handler to reply back a
// response to the client request.
func (xl xlObjects) DeleteObject(ctx context.Context, bucket, object string) (err error) {
// Acquire a write lock before deleting the object.
objectLock := xl.nsMutex.NewNSLock(bucket, object)
if perr := objectLock.GetLock(globalOperationTimeout); perr != nil {
return perr
}
defer objectLock.Unlock()
if err = checkDelObjArgs(ctx, bucket, object); err != nil {
return err
}
var writeQuorum int
var isObjectDir = hasSuffix(object, slashSeparator)
if isObjectDir && !xl.isObjectDir(bucket, object) {
return toObjectErr(errFileNotFound, bucket, object)
}
if isObjectDir {
writeQuorum = len(xl.getDisks())/2 + 1
} else {
// Read metadata associated with the object from all disks.
partsMetadata, errs := readAllXLMetadata(ctx, xl.getDisks(), bucket, object)
// get Quorum for this object
_, writeQuorum, err = objectQuorumFromMeta(ctx, xl, partsMetadata, errs)
if err != nil {
return toObjectErr(err, bucket, object)
}
}
// Delete the object on all disks.
if err = xl.deleteObject(ctx, bucket, object, writeQuorum, isObjectDir); err != nil {
return toObjectErr(err, bucket, object)
}
// Success.
return nil
}
// ListObjectsV2 lists all blobs in bucket filtered by prefix
func (xl xlObjects) ListObjectsV2(ctx context.Context, bucket, prefix, continuationToken, delimiter string, maxKeys int, fetchOwner bool, startAfter string) (result ListObjectsV2Info, err error) {
marker := continuationToken
if marker == "" {
marker = startAfter
}
loi, err := xl.ListObjects(ctx, bucket, prefix, marker, delimiter, maxKeys)
if err != nil {
return result, err
}
listObjectsV2Info := ListObjectsV2Info{
IsTruncated: loi.IsTruncated,
ContinuationToken: continuationToken,
NextContinuationToken: loi.NextMarker,
Objects: loi.Objects,
Prefixes: loi.Prefixes,
}
return listObjectsV2Info, err
}