After the open file is completed(fs.open), it seems that there is no call to close it(fd) when it is passed to FileProducer.

[sunday-will]

After the open file is completed(fs.open), it seems that there is no call to close it(fd).

    def ftp_RETR(self, file):
        """Retrieve the specified file (transfer from the server to the
        client).  On success return the file path else None.
        """
        rest_pos = self._restart_position
        self._restart_position = 0
        try:
            fd = self.run_as_current_user(self.fs.open, file, 'rb')
        except (EnvironmentError, FilesystemError) as err:
            why = _strerror(err)
            self.respond('550 %s.' % why)
            return
        ...