FileServer FileUploaded event file path contains "filepart" for larger files being upload

Question

When monitoring file uploads to a FileServer instance using the FileUploaded event, FileTransferredEventArgs filename fields contain a suffix of "filepart" for files of any significant size.

As far as I can tell, the event is only called when the file transfer is completed, so I am confused why the event doesn't have the final file name. Is this by design and i am doing something incorrectly?

Kind Regards
Craig

Answer 1

As far as I know, FileServer should not modify any names which comes from client. So it seems that the "filepart" suffix was added by client.

Can you please send us communication log to support@rebex.net (or post it here). It can be created like this:

var server = new FileServer();
server.LogWriter = new Rebex.FileLogWriter("C:/server/log.txt", Rebex.LogLevel.Debug);

This is server log when I upload 185 MB file:

2017-09-06 18:45:10.649 DEBUG SftpModule(1)[8] SFTP: Opening file '/OUT/Foto1.zip' (Create, Write): success.

2017-09-06 18:45:15.033 DEBUG SftpModule(1)[10] SFTP: Closing file '/OUT/Foto1.zip': success.

My output from FileUploaded event:

File upload finished. 

  User: 'tester' 

  File: 'c:\temp\OUT\Foto1.zip' 

        '/OUT/Foto1.zip'

  total bytes: 185523333

As you can see, there is no "filepart" suffix.

Comments

I have executed testing  using Mac OSX sftp command and also WinSCP.   It looks like the behaviour of WinSCP is different to Mac.

code is here:
class Program
    {
        static void Main(string[] args)
        {
            var server = new FileServer();
            server.Bind(22, FileServerProtocol.Sftp);
            server.Keys.Add(new SshPrivateKey("private.key", "test"));
            server.Users.Add("WinSCP", "test", "C:/ftproot");
            server.Users.Add("MacOSX", "test", "C:/ftproot");
            server.FileUploaded += Server_FileUploaded;
            server.LogWriter = new Rebex.FileLogWriter("C:/ftproot/log.txt", Rebex.LogLevel.Debug);
            server.Start();
            Console.ReadLine();
        }

        private static void Server_FileUploaded(object sender, FileTransferredEventArgs e)
        {
            File.AppendAllText("C:/ftproot/UploadLog.txt", $"{DateTime.Now.ToString("u")} COMPLETE BytesTransferred={e.BytesTransferred.ToString("#,##0")} Path='{e.Path}' User='{e.User.Name}'\r\n");
        }
    }

I have sent logs from above via email.
Thanks

---

Thank you for the log file. It showed that the "filepart" behavior is done by WinSCP client on purpose. For some files (probably greater than X bytes), WinSCP uploads the file with .filepart extension and after successful transfer it renames it to original name. See following part of the log:

2017-09-07 07:12:31.145 DEBUG SftpModule(2)[20] SFTP: Getting item info on '/IMG_0041.JPG': not found.
2017-09-07 07:12:31.145 DEBUG SftpModule(2)[21] SFTP: Getting item info on '/IMG_0041.JPG.filepart': not found.
2017-09-07 07:12:31.146 DEBUG SftpModule(2)[21] SFTP: Opening file '/IMG_0041.JPG.filepart' (Create, Write): success.
2017-09-07 07:12:31.156 DEBUG SftpModule(2)[21] SFTP: Closing file '/IMG_0041.JPG.filepart': success.
2017-09-07 07:12:31.165 DEBUG SftpModule(2)[21] SFTP: Renaming '/IMG_0041.JPG.filepart' to '/IMG_0041.JPG': success.
2017-09-07 07:12:31.166 DEBUG SftpModule(2)[21] SFTP: Setting item info on '/IMG_0041.JPG': success.


WinSCP performs these steps:

 1. Check whether '/IMG_0041.JPG' exists
 2. Check whether '/IMG_0041.JPG.filepart' exists
 3. Upload file to '/IMG_0041.JPG.filepart'
 4. Rename '/IMG_0041.JPG.filepart' to '/IMG_0041.JPG'

This behavior cannot be modified by the server.

---

Thankyou so much for this. Wasn't something I considered!

It seems there is a way to turn off this behaviour in WinSCP so that should be sufficient.

Cheers.