This method uploads a local file to the SAS servers file system.
      localfile  - path to the local file to upload 
      remotefile - path to remote file to create or overwrite
      overwrite  - overwrite the output file if it exists?
      permission - permissions to set on the new file. See SAS Filename Statement Doc for syntax

def upload(self, localfile: str, remotefile: str, overwrite: bool = True, permission: str = '', **kwargs):
      """
      This method uploads a local file to the SAS servers file system.
      localfile  - path to the local file to upload 
      remotefile - path to remote file to create or overwrite
      overwrite  - overwrite the output file if it exists?
      permission - permissions to set on the new file. See SAS Filename Statement Doc for syntax
      """
      valid = self._sb.file_info(remotefile, quiet = True)
      
      if valid is None:
         remf = remotefile
      else:
         if valid == {}:
            remf = remotefile + self._sb.hostsep + localfile.rpartition(os.sep)[2]
         else:
            remf = remotefile
            if overwrite == False:
               return {'Success' : False, 
                       'LOG'     : "File "+str(remotefile)+" exists and overwrite was set to False. Upload was stopped."}

      try:
         fd = open(localfile, 'rb')
      except OSError as e:
         return {'Success' : False, 
                 'LOG'     : "File "+str(localfile)+" could not be opened. Error was: "+str(e)}

      port =  kwargs.get('port', 0)

      if self.sascfg.ssh and self.sascfg.rtunnel and port == 0:
         # we are using a rtunnel; default to that port
         port = self.sascfg.rtunnel
         host = 'localhost'
      else:
         return self._upload_client(localfile, remotefile, overwrite, permission, **kwargs)

      code = """
         filename saspydir '"""+remf+"""' recfm=F encoding=binary lrecl=1 permission='"""+permission+"""';
         filename sock socket ':"""+str(port)+"""' server reconn=0 recfm=S encoding=binary lrecl=4096;

         data _null_; nb = -1;
         infile sock nbyte=nb; 
         file saspydir;
         input;
         put _infile_;
         run;

         filename saspydir;
         filename sock;\n"""

      self._asubmit(code, "text")

      sock = socks.socket()
      sock.connect((host, port))

      done = False
      while not done:
         try:
            while True:
               buf  = fd.read1(4096)
               sent = 0
               send = len(buf)
               blen = send
               if blen:
                  while send:
                     try:
                        sent = 0
                        sent = sock.send(buf[blen-send:blen])
                     except (BlockingIOError):
                        pass
                     except (OSError):
                        sock.close()
                        fd.close()
                        sock = socks.socket()
                        sock.connect((host, port))
                        fd = open(localfile, 'rb')
                        sleep(.5)
                        break
                     send -= sent
               else:
                  done = True
                  sock.shutdown(socks.SHUT_RDWR)
                  sock.close()
                  fd.close()
                  break
         except Exception as e:
            sock.close()
            fd.close()
            ll = self.submit("", 'text')
            return {'Success' : False, 
                    'LOG'     : "Download was interupted. Returning the SAS log:\n\n"+ll['LOG']}
        
      ll = self.submit("", 'text')
      return {'Success' : True, 
              'LOG'     : ll['LOG']}