// uploadFileContents does its best to upload the local file stored at
// localPath to the given *drive.File on Google Drive. (It assumes that
// the *drive.File has already been created.)
func uploadFileContents(localPath string, driveFile *gdrive.File, encrypt bool,
pb *pb.ProgressBar) error {
var iv []byte
var err error
if encrypt {
iv, err = getInitializationVector(driveFile)
if err != nil {
return fmt.Errorf("unable to get IV: %v", err)
}
}
for try := 0; ; try++ {
contentsReader, length, err :=
getFileContentsReaderForUpload(localPath, encrypt, iv)
if contentsReader != nil {
defer contentsReader.Close()
}
if err != nil {
return err
}
// Keep track of how many bytes are uploaded in case we fail
// part-way through and need to roll back the progress bar.
countingReader := &byteCountingReader{R: contentsReader}
// Also tee reads to the progress bar as they are done so that it
// stays in sync with how much data has been transmitted.
var uploadReader io.Reader
if pb != nil {
uploadReader = io.TeeReader(countingReader, pb)
} else {
uploadReader = countingReader
}
if length >= resumableUploadMinSize {
err = gd.UploadFileContentsResumable(driveFile, uploadReader, length)
} else {
err = gd.UploadFileContents(driveFile, uploadReader, length, try)
}
atomic.AddInt64(&stats.DiskReadBytes, countingReader.bytesRead)
if err == nil {
// Success!
atomic.AddInt64(&stats.DriveFilesUpdated, 1)
atomic.AddInt64(&stats.UploadBytes, length)
return nil
}
// The "progress" made so far on this file should be rolled back;
// if we don't do this, when retries happen, we end up going over
// 100% progress...
if pb != nil {
pb.Add64(-countingReader.bytesRead)
}
if re, ok := err.(gdrive.RetryHTTPTransmitError); ok && try < 5 {
debug.Printf("%s: got retry http error--retrying: %s",
localPath, re.Error())
} else {
debug.Printf("%s: giving up due to error: %v", localPath, err)
// We're giving up on this file, so subtract its length from
// what the progress bar is expecting.
if pb != nil {
pb.Total -= length
}
return err
}
}
}