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file_handler.go
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file_handler.go
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package filestore
import (
"context"
"errors"
"fmt"
"io"
"io/ioutil"
"os"
"strconv"
"gitlab.com/gitlab-org/gitlab-workhorse/internal/objectstore"
)
type SizeError error
// ErrEntityTooLarge means that the uploaded content is bigger then maximum allowed size
var ErrEntityTooLarge = errors.New("entity is too large")
// FileHandler represent a file that has been processed for upload
// it may be either uploaded to an ObjectStore and/or saved on local path.
type FileHandler struct {
// LocalPath is the path on the disk where file has been stored
LocalPath string
// RemoteID is the objectID provided by GitLab Rails
RemoteID string
// RemoteURL is ObjectStore URL provided by GitLab Rails
RemoteURL string
// Size is the persisted file size
Size int64
// Name is the resource name to send back to GitLab rails.
// It differ from the real file name in order to avoid file collisions
Name string
// a map containing different hashes
hashes map[string]string
}
// SHA256 hash of the handled file
func (fh *FileHandler) SHA256() string {
return fh.hashes["sha256"]
}
// MD5 hash of the handled file
func (fh *FileHandler) MD5() string {
return fh.hashes["md5"]
}
// GitLabFinalizeFields returns a map with all the fields GitLab Rails needs in order to finalize the upload.
func (fh *FileHandler) GitLabFinalizeFields(prefix string) map[string]string {
data := make(map[string]string)
key := func(field string) string {
if prefix == "" {
return field
}
return fmt.Sprintf("%s.%s", prefix, field)
}
if fh.Name != "" {
data[key("name")] = fh.Name
}
if fh.LocalPath != "" {
data[key("path")] = fh.LocalPath
}
if fh.RemoteURL != "" {
data[key("remote_url")] = fh.RemoteURL
}
if fh.RemoteID != "" {
data[key("remote_id")] = fh.RemoteID
}
data[key("size")] = strconv.FormatInt(fh.Size, 10)
for hashName, hash := range fh.hashes {
data[key(hashName)] = hash
}
return data
}
// SaveFileFromReader persists the provided reader content to all the location specified in opts. A cleanup will be performed once ctx is Done
// Make sure the provided context will not expire before finalizing upload with GitLab Rails.
func SaveFileFromReader(ctx context.Context, reader io.Reader, size int64, opts *SaveFileOpts) (fh *FileHandler, err error) {
var remoteWriter objectstore.Upload
fh = &FileHandler{
Name: opts.TempFilePrefix,
RemoteID: opts.RemoteID,
RemoteURL: opts.RemoteURL,
}
hashes := newMultiHash()
writers := []io.Writer{hashes.Writer}
defer func() {
for _, w := range writers {
if closer, ok := w.(io.WriteCloser); ok {
closer.Close()
}
}
}()
if opts.IsMultipart() {
remoteWriter, err = objectstore.NewMultipart(ctx, opts.PresignedParts, opts.PresignedCompleteMultipart, opts.PresignedAbortMultipart, opts.PresignedDelete, opts.PutHeaders, opts.Deadline, opts.PartSize)
if err != nil {
return nil, err
}
writers = append(writers, remoteWriter)
} else if opts.IsRemote() {
remoteWriter, err = objectstore.NewObject(ctx, opts.PresignedPut, opts.PresignedDelete, opts.PutHeaders, opts.Deadline, size)
if err != nil {
return nil, err
}
writers = append(writers, remoteWriter)
}
if opts.IsLocal() {
fileWriter, err := fh.uploadLocalFile(ctx, opts)
if err != nil {
return nil, err
}
writers = append(writers, fileWriter)
}
if len(writers) == 1 {
return nil, errors.New("missing upload destination")
}
multiWriter := io.MultiWriter(writers...)
fh.Size, err = io.Copy(multiWriter, reader)
if err != nil {
return nil, err
}
if size != -1 && size != fh.Size {
return nil, SizeError(fmt.Errorf("expected %d bytes but got only %d", size, fh.Size))
}
fh.hashes = hashes.finish()
if opts.IsRemote() {
// we need to close the writer in order to get ETag header
err = remoteWriter.Close()
if err != nil {
if err == objectstore.ErrNotEnoughParts {
return nil, ErrEntityTooLarge
}
return nil, err
}
etag := remoteWriter.ETag()
fh.hashes["etag"] = etag
}
return fh, err
}
func (fh *FileHandler) uploadLocalFile(ctx context.Context, opts *SaveFileOpts) (io.WriteCloser, error) {
// make sure TempFolder exists
err := os.MkdirAll(opts.LocalTempPath, 0700)
if err != nil {
return nil, fmt.Errorf("uploadLocalFile: mkdir %q: %v", opts.LocalTempPath, err)
}
file, err := ioutil.TempFile(opts.LocalTempPath, opts.TempFilePrefix)
if err != nil {
return nil, fmt.Errorf("uploadLocalFile: create file: %v", err)
}
go func() {
<-ctx.Done()
os.Remove(file.Name())
}()
fh.LocalPath = file.Name()
return file, nil
}
// SaveFileFromDisk open the local file fileName and calls SaveFileFromReader
func SaveFileFromDisk(ctx context.Context, fileName string, opts *SaveFileOpts) (fh *FileHandler, err error) {
file, err := os.Open(fileName)
if err != nil {
return nil, err
}
defer file.Close()
fi, err := file.Stat()
if err != nil {
return nil, err
}
return SaveFileFromReader(ctx, file, fi.Size(), opts)
}