forked from huaweicloud/huaweicloud-sdk-go-obs
/
transfer.go
915 lines (832 loc) · 28.9 KB
/
transfer.go
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// Copyright 2019 Huawei Technologies Co.,Ltd.
// 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 obs
import (
"bufio"
"encoding/xml"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"sync"
"sync/atomic"
"syscall"
)
var errAbort = errors.New("AbortError")
// FileStatus defines the upload file properties
type FileStatus struct {
XMLName xml.Name `xml:"FileInfo"`
LastModified int64 `xml:"LastModified"`
Size int64 `xml:"Size"`
}
// UploadPartInfo defines the upload part properties
type UploadPartInfo struct {
XMLName xml.Name `xml:"UploadPart"`
PartNumber int `xml:"PartNumber"`
Etag string `xml:"Etag"`
PartSize int64 `xml:"PartSize"`
Offset int64 `xml:"Offset"`
IsCompleted bool `xml:"IsCompleted"`
}
// UploadCheckpoint defines the upload checkpoint file properties
type UploadCheckpoint struct {
XMLName xml.Name `xml:"UploadFileCheckpoint"`
Bucket string `xml:"Bucket"`
Key string `xml:"Key"`
UploadId string `xml:"UploadId,omitempty"`
UploadFile string `xml:"FileUrl"`
FileInfo FileStatus `xml:"FileInfo"`
UploadParts []UploadPartInfo `xml:"UploadParts>UploadPart"`
}
func (ufc *UploadCheckpoint) isValid(bucket, key, uploadFile string, fileStat os.FileInfo) bool {
if ufc.Bucket != bucket || ufc.Key != key || ufc.UploadFile != uploadFile {
doLog(LEVEL_INFO, "Checkpoint file is invalid, the bucketName or objectKey or uploadFile was changed. clear the record.")
return false
}
if ufc.FileInfo.Size != fileStat.Size() || ufc.FileInfo.LastModified != fileStat.ModTime().Unix() {
doLog(LEVEL_INFO, "Checkpoint file is invalid, the uploadFile was changed. clear the record.")
return false
}
if ufc.UploadId == "" {
doLog(LEVEL_INFO, "UploadId is invalid. clear the record.")
return false
}
return true
}
type uploadPartTask struct {
UploadPartInput
obsClient *ObsClient
abort *int32
extensions []extensionOptions
enableCheckpoint bool
}
func (task *uploadPartTask) Run() interface{} {
if atomic.LoadInt32(task.abort) == 1 {
return errAbort
}
input := &UploadPartInput{}
input.Bucket = task.Bucket
input.Key = task.Key
input.PartNumber = task.PartNumber
input.UploadId = task.UploadId
input.SseHeader = task.SseHeader
input.SourceFile = task.SourceFile
input.Offset = task.Offset
input.PartSize = task.PartSize
extensions := task.extensions
var output *UploadPartOutput
var err error
if len(extensions) != 0 {
output, err = task.obsClient.UploadPart(input, extensions...)
} else {
output, err = task.obsClient.UploadPart(input)
}
if err == nil {
if output.ETag == "" {
doLog(LEVEL_WARN, "Get invalid etag value after uploading part [%d].", task.PartNumber)
if !task.enableCheckpoint {
atomic.CompareAndSwapInt32(task.abort, 0, 1)
doLog(LEVEL_WARN, "Task is aborted, part number is [%d]", task.PartNumber)
}
return fmt.Errorf("get invalid etag value after uploading part [%d]", task.PartNumber)
}
return output
} else if obsError, ok := err.(ObsError); ok && obsError.StatusCode >= 400 && obsError.StatusCode < 500 {
atomic.CompareAndSwapInt32(task.abort, 0, 1)
doLog(LEVEL_WARN, "Task is aborted, part number is [%d]", task.PartNumber)
}
return err
}
func loadCheckpointFile(checkpointFile string, result interface{}) error {
ret, err := ioutil.ReadFile(checkpointFile)
if err != nil {
return err
}
if len(ret) == 0 {
return nil
}
return xml.Unmarshal(ret, result)
}
func updateCheckpointFile(fc interface{}, checkpointFilePath string) error {
result, err := xml.Marshal(fc)
if err != nil {
return err
}
err = ioutil.WriteFile(checkpointFilePath, result, 0666)
return err
}
func getCheckpointFile(ufc *UploadCheckpoint, uploadFileStat os.FileInfo, input *UploadFileInput, obsClient *ObsClient, extensions []extensionOptions) (needCheckpoint bool, err error) {
checkpointFilePath := input.CheckpointFile
checkpointFileStat, err := os.Stat(checkpointFilePath)
if err != nil {
doLog(LEVEL_DEBUG, fmt.Sprintf("Stat checkpoint file failed with error: [%v].", err))
return true, nil
}
if checkpointFileStat.IsDir() {
doLog(LEVEL_ERROR, "Checkpoint file can not be a folder.")
return false, errors.New("checkpoint file can not be a folder")
}
err = loadCheckpointFile(checkpointFilePath, ufc)
if err != nil {
doLog(LEVEL_WARN, fmt.Sprintf("Load checkpoint file failed with error: [%v].", err))
return true, nil
} else if !ufc.isValid(input.Bucket, input.Key, input.UploadFile, uploadFileStat) {
if ufc.Bucket != "" && ufc.Key != "" && ufc.UploadId != "" {
_err := abortTask(ufc.Bucket, ufc.Key, ufc.UploadId, obsClient, extensions)
if _err != nil {
doLog(LEVEL_WARN, "Failed to abort upload task [%s].", ufc.UploadId)
}
}
_err := os.Remove(checkpointFilePath)
if _err != nil {
doLog(LEVEL_WARN, fmt.Sprintf("Failed to remove checkpoint file with error: [%v].", _err))
}
} else {
return false, nil
}
return true, nil
}
func prepareUpload(ufc *UploadCheckpoint, uploadFileStat os.FileInfo, input *UploadFileInput, obsClient *ObsClient, extensions []extensionOptions) error {
initiateInput := &InitiateMultipartUploadInput{}
initiateInput.ObjectOperationInput = input.ObjectOperationInput
initiateInput.ContentType = input.ContentType
initiateInput.EncodingType = input.EncodingType
var output *InitiateMultipartUploadOutput
var err error
if len(extensions) != 0 {
output, err = obsClient.InitiateMultipartUpload(initiateInput, extensions...)
} else {
output, err = obsClient.InitiateMultipartUpload(initiateInput)
}
if err != nil {
return err
}
ufc.Bucket = input.Bucket
ufc.Key = input.Key
ufc.UploadFile = input.UploadFile
ufc.FileInfo = FileStatus{}
ufc.FileInfo.Size = uploadFileStat.Size()
ufc.FileInfo.LastModified = uploadFileStat.ModTime().Unix()
ufc.UploadId = output.UploadId
err = sliceFile(input.PartSize, ufc)
return err
}
func sliceFile(partSize int64, ufc *UploadCheckpoint) error {
fileSize := ufc.FileInfo.Size
cnt := fileSize / partSize
if cnt >= 10000 {
partSize = fileSize / 10000
if fileSize%10000 != 0 {
partSize++
}
cnt = fileSize / partSize
}
if fileSize%partSize != 0 {
cnt++
}
if partSize > MAX_PART_SIZE {
doLog(LEVEL_ERROR, "The source upload file is too large")
return fmt.Errorf("The source upload file is too large")
}
if cnt == 0 {
uploadPart := UploadPartInfo{}
uploadPart.PartNumber = 1
ufc.UploadParts = []UploadPartInfo{uploadPart}
} else {
uploadParts := make([]UploadPartInfo, 0, cnt)
var i int64
for i = 0; i < cnt; i++ {
uploadPart := UploadPartInfo{}
uploadPart.PartNumber = int(i) + 1
uploadPart.PartSize = partSize
uploadPart.Offset = i * partSize
uploadParts = append(uploadParts, uploadPart)
}
if value := fileSize % partSize; value != 0 {
uploadParts[cnt-1].PartSize = value
}
ufc.UploadParts = uploadParts
}
return nil
}
func abortTask(bucket, key, uploadID string, obsClient *ObsClient, extensions []extensionOptions) error {
input := &AbortMultipartUploadInput{}
input.Bucket = bucket
input.Key = key
input.UploadId = uploadID
if len(extensions) != 0 {
_, err := obsClient.AbortMultipartUpload(input, extensions...)
return err
}
_, err := obsClient.AbortMultipartUpload(input)
return err
}
func handleUploadFileResult(uploadPartError error, ufc *UploadCheckpoint, enableCheckpoint bool, obsClient *ObsClient, extensions []extensionOptions) error {
if uploadPartError != nil {
if enableCheckpoint {
return uploadPartError
}
_err := abortTask(ufc.Bucket, ufc.Key, ufc.UploadId, obsClient, extensions)
if _err != nil {
doLog(LEVEL_WARN, "Failed to abort task [%s].", ufc.UploadId)
}
return uploadPartError
}
return nil
}
func completeParts(ufc *UploadCheckpoint, enableCheckpoint bool, checkpointFilePath string, obsClient *ObsClient, encodingType string, extensions []extensionOptions) (output *CompleteMultipartUploadOutput, err error) {
completeInput := &CompleteMultipartUploadInput{}
completeInput.Bucket = ufc.Bucket
completeInput.Key = ufc.Key
completeInput.UploadId = ufc.UploadId
completeInput.EncodingType = encodingType
parts := make([]Part, 0, len(ufc.UploadParts))
for _, uploadPart := range ufc.UploadParts {
part := Part{}
part.PartNumber = uploadPart.PartNumber
part.ETag = uploadPart.Etag
parts = append(parts, part)
}
completeInput.Parts = parts
var completeOutput *CompleteMultipartUploadOutput
if len(extensions) != 0 {
completeOutput, err = obsClient.CompleteMultipartUpload(completeInput, extensions...)
} else {
completeOutput, err = obsClient.CompleteMultipartUpload(completeInput)
}
if err == nil {
if enableCheckpoint {
_err := os.Remove(checkpointFilePath)
if _err != nil {
doLog(LEVEL_WARN, "Upload file successfully, but remove checkpoint file failed with error [%v].", _err)
}
}
return completeOutput, err
}
if !enableCheckpoint {
_err := abortTask(ufc.Bucket, ufc.Key, ufc.UploadId, obsClient, extensions)
if _err != nil {
doLog(LEVEL_WARN, "Failed to abort task [%s].", ufc.UploadId)
}
}
return completeOutput, err
}
func (obsClient ObsClient) resumeUpload(input *UploadFileInput, extensions []extensionOptions) (output *CompleteMultipartUploadOutput, err error) {
uploadFileStat, err := os.Stat(input.UploadFile)
if err != nil {
doLog(LEVEL_ERROR, fmt.Sprintf("Failed to stat uploadFile with error: [%v].", err))
return nil, err
}
if uploadFileStat.IsDir() {
doLog(LEVEL_ERROR, "UploadFile can not be a folder.")
return nil, errors.New("uploadFile can not be a folder")
}
ufc := &UploadCheckpoint{}
var needCheckpoint = true
var checkpointFilePath = input.CheckpointFile
var enableCheckpoint = input.EnableCheckpoint
if enableCheckpoint {
needCheckpoint, err = getCheckpointFile(ufc, uploadFileStat, input, &obsClient, extensions)
if err != nil {
return nil, err
}
}
if needCheckpoint {
err = prepareUpload(ufc, uploadFileStat, input, &obsClient, extensions)
if err != nil {
return nil, err
}
if enableCheckpoint {
err = updateCheckpointFile(ufc, checkpointFilePath)
if err != nil {
doLog(LEVEL_ERROR, "Failed to update checkpoint file with error [%v].", err)
_err := abortTask(ufc.Bucket, ufc.Key, ufc.UploadId, &obsClient, extensions)
if _err != nil {
doLog(LEVEL_WARN, "Failed to abort task [%s].", ufc.UploadId)
}
return nil, err
}
}
}
uploadPartError := obsClient.uploadPartConcurrent(ufc, checkpointFilePath, input, extensions)
err = handleUploadFileResult(uploadPartError, ufc, enableCheckpoint, &obsClient, extensions)
if err != nil {
return nil, err
}
completeOutput, err := completeParts(ufc, enableCheckpoint, checkpointFilePath, &obsClient, input.EncodingType, extensions)
return completeOutput, err
}
func handleUploadTaskResult(result interface{}, ufc *UploadCheckpoint, partNum int, enableCheckpoint bool, checkpointFilePath string, lock *sync.Mutex, completedBytes *int64, listener ProgressListener) (err error) {
if uploadPartOutput, ok := result.(*UploadPartOutput); ok {
lock.Lock()
defer lock.Unlock()
ufc.UploadParts[partNum-1].Etag = uploadPartOutput.ETag
ufc.UploadParts[partNum-1].IsCompleted = true
atomic.AddInt64(completedBytes, ufc.UploadParts[partNum-1].PartSize)
event := newProgressEvent(TransferDataEvent, *completedBytes, ufc.FileInfo.Size)
publishProgress(listener, event)
if enableCheckpoint {
_err := updateCheckpointFile(ufc, checkpointFilePath)
if _err != nil {
doLog(LEVEL_WARN, "Failed to update checkpoint file with error [%v].", _err)
}
}
} else if result != errAbort {
if _err, ok := result.(error); ok {
err = _err
}
}
return
}
func (obsClient ObsClient) uploadPartConcurrent(ufc *UploadCheckpoint, checkpointFilePath string, input *UploadFileInput, extensions []extensionOptions) error {
pool := NewRoutinePool(input.TaskNum, MAX_PART_NUM)
var uploadPartError atomic.Value
var errFlag int32
var abort int32
lock := new(sync.Mutex)
var completedBytes int64
listener := obsClient.getProgressListener(extensions)
totalBytes := ufc.FileInfo.Size
event := newProgressEvent(TransferStartedEvent, 0, totalBytes)
publishProgress(listener, event)
for _, uploadPart := range ufc.UploadParts {
if atomic.LoadInt32(&abort) == 1 {
break
}
if uploadPart.IsCompleted {
atomic.AddInt64(&completedBytes, uploadPart.PartSize)
event := newProgressEvent(TransferDataEvent, completedBytes, ufc.FileInfo.Size)
publishProgress(listener, event)
continue
}
task := uploadPartTask{
UploadPartInput: UploadPartInput{
Bucket: ufc.Bucket,
Key: ufc.Key,
PartNumber: uploadPart.PartNumber,
UploadId: ufc.UploadId,
SseHeader: input.SseHeader,
SourceFile: input.UploadFile,
Offset: uploadPart.Offset,
PartSize: uploadPart.PartSize,
},
obsClient: &obsClient,
abort: &abort,
extensions: extensions,
enableCheckpoint: input.EnableCheckpoint,
}
pool.ExecuteFunc(func() interface{} {
result := task.Run()
err := handleUploadTaskResult(result, ufc, task.PartNumber, input.EnableCheckpoint, input.CheckpointFile, lock, &completedBytes, listener)
if err != nil && atomic.CompareAndSwapInt32(&errFlag, 0, 1) {
uploadPartError.Store(err)
}
return nil
})
}
pool.ShutDown()
if err, ok := uploadPartError.Load().(error); ok {
event := newProgressEvent(TransferFailedEvent, completedBytes, ufc.FileInfo.Size)
publishProgress(listener, event)
return err
}
event = newProgressEvent(TransferCompletedEvent, completedBytes, ufc.FileInfo.Size)
publishProgress(listener, event)
return nil
}
// ObjectInfo defines download object info
type ObjectInfo struct {
XMLName xml.Name `xml:"ObjectInfo"`
LastModified int64 `xml:"LastModified"`
Size int64 `xml:"Size"`
ETag string `xml:"ETag"`
}
// TempFileInfo defines temp download file properties
type TempFileInfo struct {
XMLName xml.Name `xml:"TempFileInfo"`
TempFileUrl string `xml:"TempFileUrl"`
Size int64 `xml:"Size"`
}
// DownloadPartInfo defines download part properties
type DownloadPartInfo struct {
XMLName xml.Name `xml:"DownloadPart"`
PartNumber int64 `xml:"PartNumber"`
RangeEnd int64 `xml:"RangeEnd"`
Offset int64 `xml:"Offset"`
IsCompleted bool `xml:"IsCompleted"`
}
// DownloadCheckpoint defines download checkpoint file properties
type DownloadCheckpoint struct {
XMLName xml.Name `xml:"DownloadFileCheckpoint"`
Bucket string `xml:"Bucket"`
Key string `xml:"Key"`
VersionId string `xml:"VersionId,omitempty"`
DownloadFile string `xml:"FileUrl"`
ObjectInfo ObjectInfo `xml:"ObjectInfo"`
TempFileInfo TempFileInfo `xml:"TempFileInfo"`
DownloadParts []DownloadPartInfo `xml:"DownloadParts>DownloadPart"`
}
func (dfc *DownloadCheckpoint) isValid(input *DownloadFileInput, output *GetObjectMetadataOutput) bool {
if dfc.Bucket != input.Bucket || dfc.Key != input.Key || dfc.VersionId != input.VersionId || dfc.DownloadFile != input.DownloadFile {
doLog(LEVEL_INFO, "Checkpoint file is invalid, the bucketName or objectKey or downloadFile was changed. clear the record.")
return false
}
if dfc.ObjectInfo.LastModified != output.LastModified.Unix() || dfc.ObjectInfo.ETag != output.ETag || dfc.ObjectInfo.Size != output.ContentLength {
doLog(LEVEL_INFO, "Checkpoint file is invalid, the object info was changed. clear the record.")
return false
}
if dfc.TempFileInfo.Size != output.ContentLength {
doLog(LEVEL_INFO, "Checkpoint file is invalid, size was changed. clear the record.")
return false
}
stat, err := os.Stat(dfc.TempFileInfo.TempFileUrl)
if err != nil || stat.Size() != dfc.ObjectInfo.Size {
doLog(LEVEL_INFO, "Checkpoint file is invalid, the temp download file was changed. clear the record.")
return false
}
return true
}
type downloadPartTask struct {
GetObjectInput
obsClient *ObsClient
extensions []extensionOptions
abort *int32
partNumber int64
tempFileURL string
enableCheckpoint bool
}
func (task *downloadPartTask) Run() interface{} {
if atomic.LoadInt32(task.abort) == 1 {
return errAbort
}
getObjectInput := &GetObjectInput{}
getObjectInput.GetObjectMetadataInput = task.GetObjectMetadataInput
getObjectInput.IfMatch = task.IfMatch
getObjectInput.IfNoneMatch = task.IfNoneMatch
getObjectInput.IfModifiedSince = task.IfModifiedSince
getObjectInput.IfUnmodifiedSince = task.IfUnmodifiedSince
getObjectInput.RangeStart = task.RangeStart
getObjectInput.RangeEnd = task.RangeEnd
var output *GetObjectOutput
var err error
if len(task.extensions) != 0 {
output, err = task.obsClient.GetObjectWithoutProgress(getObjectInput, task.extensions...)
} else {
output, err = task.obsClient.GetObjectWithoutProgress(getObjectInput)
}
if err == nil {
defer func() {
errMsg := output.Body.Close()
if errMsg != nil {
doLog(LEVEL_WARN, "Failed to close response body.")
}
}()
_err := updateDownloadFile(task.tempFileURL, task.RangeStart, output)
if _err != nil {
if !task.enableCheckpoint {
atomic.CompareAndSwapInt32(task.abort, 0, 1)
doLog(LEVEL_WARN, "Task is aborted, part number is [%d]", task.partNumber)
}
return _err
}
return output
} else if obsError, ok := err.(ObsError); ok && obsError.StatusCode >= 400 && obsError.StatusCode < 500 {
atomic.CompareAndSwapInt32(task.abort, 0, 1)
doLog(LEVEL_WARN, "Task is aborted, part number is [%d]", task.partNumber)
}
return err
}
func getObjectInfo(input *DownloadFileInput, obsClient *ObsClient, extensions []extensionOptions) (getObjectmetaOutput *GetObjectMetadataOutput, err error) {
if len(extensions) != 0 {
getObjectmetaOutput, err = obsClient.GetObjectMetadata(&input.GetObjectMetadataInput, extensions...)
} else {
getObjectmetaOutput, err = obsClient.GetObjectMetadata(&input.GetObjectMetadataInput)
}
return
}
func getDownloadCheckpointFile(dfc *DownloadCheckpoint, input *DownloadFileInput, output *GetObjectMetadataOutput) (needCheckpoint bool, err error) {
checkpointFilePath := input.CheckpointFile
checkpointFileStat, err := os.Stat(checkpointFilePath)
if err != nil {
doLog(LEVEL_DEBUG, fmt.Sprintf("Stat checkpoint file failed with error: [%v].", err))
return true, nil
}
if checkpointFileStat.IsDir() {
doLog(LEVEL_ERROR, "Checkpoint file can not be a folder.")
return false, errors.New("checkpoint file can not be a folder")
}
err = loadCheckpointFile(checkpointFilePath, dfc)
if err != nil {
doLog(LEVEL_WARN, fmt.Sprintf("Load checkpoint file failed with error: [%v].", err))
return true, nil
} else if !dfc.isValid(input, output) {
if dfc.TempFileInfo.TempFileUrl != "" {
_err := os.Remove(dfc.TempFileInfo.TempFileUrl)
if _err != nil {
doLog(LEVEL_WARN, "Failed to remove temp download file with error [%v].", _err)
}
}
_err := os.Remove(checkpointFilePath)
if _err != nil {
doLog(LEVEL_WARN, "Failed to remove checkpoint file with error [%v].", _err)
}
} else {
return false, nil
}
return true, nil
}
func sliceObject(objectSize, partSize int64, dfc *DownloadCheckpoint) {
cnt := objectSize / partSize
if objectSize%partSize > 0 {
cnt++
}
if cnt == 0 {
downloadPart := DownloadPartInfo{}
downloadPart.PartNumber = 1
dfc.DownloadParts = []DownloadPartInfo{downloadPart}
} else {
downloadParts := make([]DownloadPartInfo, 0, cnt)
var i int64
for i = 0; i < cnt; i++ {
downloadPart := DownloadPartInfo{}
downloadPart.PartNumber = i + 1
downloadPart.Offset = i * partSize
downloadPart.RangeEnd = (i+1)*partSize - 1
downloadParts = append(downloadParts, downloadPart)
}
dfc.DownloadParts = downloadParts
if value := objectSize % partSize; value > 0 {
dfc.DownloadParts[cnt-1].RangeEnd = dfc.ObjectInfo.Size - 1
}
}
}
func createFile(tempFileURL string, fileSize int64) error {
fd, err := syscall.Open(tempFileURL, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0666)
if err != nil {
doLog(LEVEL_WARN, "Failed to open temp download file [%s].", tempFileURL)
return err
}
defer func() {
errMsg := syscall.Close(fd)
if errMsg != nil {
doLog(LEVEL_WARN, "Failed to close file with error [%v].", errMsg)
}
}()
err = syscall.Ftruncate(fd, fileSize)
if err != nil {
doLog(LEVEL_WARN, "Failed to create file with error [%v].", err)
}
return err
}
func prepareTempFile(tempFileURL string, fileSize int64) error {
parentDir := filepath.Dir(tempFileURL)
stat, err := os.Stat(parentDir)
if err != nil {
doLog(LEVEL_DEBUG, "Failed to stat path with error [%v].", err)
_err := os.MkdirAll(parentDir, os.ModePerm)
if _err != nil {
doLog(LEVEL_ERROR, "Failed to make dir with error [%v].", _err)
return _err
}
} else if !stat.IsDir() {
doLog(LEVEL_ERROR, "Cannot create folder [%s] due to a same file exists.", parentDir)
return fmt.Errorf("cannot create folder [%s] due to a same file exists", parentDir)
}
err = createFile(tempFileURL, fileSize)
if err == nil {
return nil
}
fd, err := os.OpenFile(tempFileURL, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0666)
if err != nil {
doLog(LEVEL_ERROR, "Failed to open temp download file [%s].", tempFileURL)
return err
}
defer func() {
errMsg := fd.Close()
if errMsg != nil {
doLog(LEVEL_WARN, "Failed to close file with error [%v].", errMsg)
}
}()
if fileSize > 0 {
_, err = fd.WriteAt([]byte("a"), fileSize-1)
if err != nil {
doLog(LEVEL_ERROR, "Failed to create temp download file with error [%v].", err)
return err
}
}
return nil
}
func handleDownloadFileResult(tempFileURL string, enableCheckpoint bool, downloadFileError error) error {
if downloadFileError != nil {
if !enableCheckpoint {
_err := os.Remove(tempFileURL)
if _err != nil {
doLog(LEVEL_WARN, "Failed to remove temp download file with error [%v].", _err)
}
}
return downloadFileError
}
return nil
}
func (obsClient ObsClient) resumeDownload(input *DownloadFileInput, extensions []extensionOptions) (output *GetObjectMetadataOutput, err error) {
getObjectmetaOutput, err := getObjectInfo(input, &obsClient, extensions)
if err != nil {
return nil, err
}
objectSize := getObjectmetaOutput.ContentLength
partSize := input.PartSize
dfc := &DownloadCheckpoint{}
var needCheckpoint = true
var checkpointFilePath = input.CheckpointFile
var enableCheckpoint = input.EnableCheckpoint
if enableCheckpoint {
needCheckpoint, err = getDownloadCheckpointFile(dfc, input, getObjectmetaOutput)
if err != nil {
return nil, err
}
}
if needCheckpoint {
dfc.Bucket = input.Bucket
dfc.Key = input.Key
dfc.VersionId = input.VersionId
dfc.DownloadFile = input.DownloadFile
dfc.ObjectInfo = ObjectInfo{}
dfc.ObjectInfo.LastModified = getObjectmetaOutput.LastModified.Unix()
dfc.ObjectInfo.Size = getObjectmetaOutput.ContentLength
dfc.ObjectInfo.ETag = getObjectmetaOutput.ETag
dfc.TempFileInfo = TempFileInfo{}
dfc.TempFileInfo.TempFileUrl = input.DownloadFile + ".tmp"
dfc.TempFileInfo.Size = getObjectmetaOutput.ContentLength
sliceObject(objectSize, partSize, dfc)
_err := prepareTempFile(dfc.TempFileInfo.TempFileUrl, dfc.TempFileInfo.Size)
if _err != nil {
return nil, _err
}
if enableCheckpoint {
_err := updateCheckpointFile(dfc, checkpointFilePath)
if _err != nil {
doLog(LEVEL_ERROR, "Failed to update checkpoint file with error [%v].", _err)
_errMsg := os.Remove(dfc.TempFileInfo.TempFileUrl)
if _errMsg != nil {
doLog(LEVEL_WARN, "Failed to remove temp download file with error [%v].", _errMsg)
}
return nil, _err
}
}
}
downloadFileError := obsClient.downloadFileConcurrent(input, dfc, extensions)
err = handleDownloadFileResult(dfc.TempFileInfo.TempFileUrl, enableCheckpoint, downloadFileError)
if err != nil {
return nil, err
}
err = os.Rename(dfc.TempFileInfo.TempFileUrl, input.DownloadFile)
if err != nil {
doLog(LEVEL_ERROR, "Failed to rename temp download file [%s] to download file [%s] with error [%v].", dfc.TempFileInfo.TempFileUrl, input.DownloadFile, err)
return nil, err
}
if enableCheckpoint {
err = os.Remove(checkpointFilePath)
if err != nil {
doLog(LEVEL_WARN, "Download file successfully, but remove checkpoint file failed with error [%v].", err)
}
}
return getObjectmetaOutput, nil
}
func updateDownloadFile(filePath string, rangeStart int64, output *GetObjectOutput) error {
fd, err := os.OpenFile(filePath, os.O_WRONLY, 0666)
if err != nil {
doLog(LEVEL_ERROR, "Failed to open file [%s].", filePath)
return err
}
defer func() {
errMsg := fd.Close()
if errMsg != nil {
doLog(LEVEL_WARN, "Failed to close file with error [%v].", errMsg)
}
}()
_, err = fd.Seek(rangeStart, 0)
if err != nil {
doLog(LEVEL_ERROR, "Failed to seek file with error [%v].", err)
return err
}
fileWriter := bufio.NewWriterSize(fd, 65536)
part := make([]byte, 8192)
var readErr error
var readCount int
for {
readCount, readErr = output.Body.Read(part)
if readCount > 0 {
wcnt, werr := fileWriter.Write(part[0:readCount])
if werr != nil {
doLog(LEVEL_ERROR, "Failed to write to file with error [%v].", werr)
return werr
}
if wcnt != readCount {
doLog(LEVEL_ERROR, "Failed to write to file [%s], expect: [%d], actual: [%d]", filePath, readCount, wcnt)
return fmt.Errorf("Failed to write to file [%s], expect: [%d], actual: [%d]", filePath, readCount, wcnt)
}
}
if readErr != nil {
if readErr != io.EOF {
doLog(LEVEL_ERROR, "Failed to read response body with error [%v].", readErr)
return readErr
}
break
}
}
err = fileWriter.Flush()
if err != nil {
doLog(LEVEL_ERROR, "Failed to flush file with error [%v].", err)
return err
}
return nil
}
func handleDownloadTaskResult(result interface{}, dfc *DownloadCheckpoint, partNum int64, enableCheckpoint bool, checkpointFile string, lock *sync.Mutex, completedBytes *int64, listener ProgressListener) (err error) {
if output, ok := result.(*GetObjectOutput); ok {
lock.Lock()
defer lock.Unlock()
dfc.DownloadParts[partNum-1].IsCompleted = true
atomic.AddInt64(completedBytes, output.ContentLength)
event := newProgressEvent(TransferDataEvent, *completedBytes, dfc.ObjectInfo.Size)
publishProgress(listener, event)
if enableCheckpoint {
_err := updateCheckpointFile(dfc, checkpointFile)
if _err != nil {
doLog(LEVEL_WARN, "Failed to update checkpoint file with error [%v].", _err)
}
}
} else if result != errAbort {
if _err, ok := result.(error); ok {
err = _err
}
}
return
}
func (obsClient ObsClient) downloadFileConcurrent(input *DownloadFileInput, dfc *DownloadCheckpoint, extensions []extensionOptions) error {
pool := NewRoutinePool(input.TaskNum, MAX_PART_NUM)
var downloadPartError atomic.Value
var errFlag int32
var abort int32
lock := new(sync.Mutex)
var completedBytes int64
listener := obsClient.getProgressListener(extensions)
totalBytes := dfc.ObjectInfo.Size
event := newProgressEvent(TransferStartedEvent, 0, totalBytes)
publishProgress(listener, event)
for _, downloadPart := range dfc.DownloadParts {
if atomic.LoadInt32(&abort) == 1 {
break
}
if downloadPart.IsCompleted {
atomic.AddInt64(&completedBytes, downloadPart.RangeEnd-downloadPart.Offset+1)
event := newProgressEvent(TransferDataEvent, completedBytes, dfc.ObjectInfo.Size)
publishProgress(listener, event)
continue
}
task := downloadPartTask{
GetObjectInput: GetObjectInput{
GetObjectMetadataInput: input.GetObjectMetadataInput,
IfMatch: input.IfMatch,
IfNoneMatch: input.IfNoneMatch,
IfUnmodifiedSince: input.IfUnmodifiedSince,
IfModifiedSince: input.IfModifiedSince,
RangeStart: downloadPart.Offset,
RangeEnd: downloadPart.RangeEnd,
},
obsClient: &obsClient,
extensions: extensions,
abort: &abort,
partNumber: downloadPart.PartNumber,
tempFileURL: dfc.TempFileInfo.TempFileUrl,
enableCheckpoint: input.EnableCheckpoint,
}
pool.ExecuteFunc(func() interface{} {
result := task.Run()
err := handleDownloadTaskResult(result, dfc, task.partNumber, input.EnableCheckpoint, input.CheckpointFile, lock, &completedBytes, listener)
if err != nil && atomic.CompareAndSwapInt32(&errFlag, 0, 1) {
downloadPartError.Store(err)
}
return nil
})
}
pool.ShutDown()
if err, ok := downloadPartError.Load().(error); ok {
event := newProgressEvent(TransferFailedEvent, completedBytes, dfc.ObjectInfo.Size)
publishProgress(listener, event)
return err
}
event = newProgressEvent(TransferCompletedEvent, completedBytes, dfc.ObjectInfo.Size)
publishProgress(listener, event)
return nil
}