code: def process_log(file_iterator):
      
      for line in file_iterator:
          if "," not in line:
              continue
  
          parsed = _parse_line(line)
  
          if not parsed["command"].upper() in ["DELE", "DEL"]:
              continue
  
          # don't react to anything else, than trigger in form of deleted
          # "lock" file
          if os.path.basename(parsed["path"]) != settings.LOCK_FILENAME:
              continue
  
          # react only to lock file in in home directory
          dir_name = os.path.dirname(parsed["path"])
          if settings.LOCK_ONLY_IN_HOME:
              if dir_name != settings.DATA_PATH + parsed["username"]:
                  continue
  
          # deleted user
          if not os.path.exists(os.path.dirname(parsed["path"])):
              continue
  
          # old record, which doesn't need to be parsed again
          if os.path.exists(parsed["path"]):
              continue
  
          logger.info(
              "Request for processing from user '%s'." % parsed["username"]
          )
  
          yield process_import_request(
              username=parsed["username"],
              path=os.path.dirname(parsed["path"]),
              timestamp=parsed["timestamp"],
              logger_handler=logger
          )
docs: Process the extended ProFTPD log.
  
      Args:
          file_iterator (file): any file-like iterator for reading the log or
                                stdin (see :func:`_read_stdin`).
  
      Yields:
          ImportRequest: with each import.