code: def check_log_files_and_publish_updates(self):
          
          anything_published = False
          for file_info in self.open_file_infos:
              assert not file_info.file_handle.closed
  
              lines_to_publish = []
              max_num_lines_to_read = 100
              for _ in range(max_num_lines_to_read):
                  next_line = file_info.file_handle.readline()
                  if next_line == "":
                      break
                  if next_line[-1] == "\n":
                      next_line = next_line[:-1]
                  lines_to_publish.append(next_line)
  
              # Publish the lines if this is a worker process.
              filename = file_info.filename.split("/")[-1]
              is_worker = (filename.startswith("worker")
                           and (filename.endswith("out")
                                or filename.endswith("err")))
  
              if is_worker and file_info.file_position == 0:
                  if (len(lines_to_publish) > 0 and
                          lines_to_publish[0].startswith("Ray worker pid: ")):
                      file_info.worker_pid = int(
                          lines_to_publish[0].split(" ")[-1])
                      lines_to_publish = lines_to_publish[1:]
  
              # Record the current position in the file.
              file_info.file_position = file_info.file_handle.tell()
  
              if len(lines_to_publish) > 0 and is_worker:
                  self.redis_client.publish(
                      ray.gcs_utils.LOG_FILE_CHANNEL,
                      json.dumps({
                          "ip": self.ip,
                          "pid": file_info.worker_pid,
                          "lines": lines_to_publish
                      }))
                  anything_published = True
  
          return anything_published
docs: Get any changes to the log files and push updates to Redis.
  
          Returns:
              True if anything was published and false otherwise.