code: def _write_lines_and_get_offset_at_index(
      f, num_lines, start_offset=0, trailing_new_line=True
  ):
      """
      Write multiple lines into a file, and record offsets
  
      Args:
          f: a binary file object that's writable
          num_lines: Number of lines to write
          start_offset: The offset to start writing
          trailing_new_line: True if a '\n' is added at the end of the
              lines.
  
      Return:
          offsets: A list of offsets of the lines.
          offset_end: The offset of the end of file.
      """
      f.seek(start_offset, 0)
  
      offsets = []
      for i in range(num_lines):
          offsets.append(f.tell())
          if i == num_lines - 1 and not trailing_new_line:
              # Last line no newline
              line = TEST_LINE_TEMPLATE.format(i)
          else:
              line = TEST_LINE_TEMPLATE.format(i) + "\n"
          f.write(line.encode("utf-8"))
  
      f.flush()
      f.seek(0, 2)
      offset_end = f.tell()
  
      return offsets, offset_end
  
imports: import json
  import os
  import sys
  import asyncio
  from typing import List
  import urllib
  from unittest.mock import MagicMock, AsyncMock
  import pytest
  from ray.util.state.state_cli import logs_state_cli_group
  from ray.util.state import list_jobs
  import requests
  from click.testing import CliRunner
  import grpc
  from pathlib import Path
  import ray
  from ray._private.test_utils import format_web_url, wait_for_condition, wait_until_server_available
  from ray._private.ray_constants import LOG_PREFIX_TASK_ATTEMPT_START, LOG_PREFIX_TASK_ATTEMPT_END
  from ray._raylet import ActorID, NodeID, TaskID, WorkerID
  from ray.core.generated.common_pb2 import Address
  from ray.core.generated.gcs_service_pb2 import GetTaskEventsReply
  from ray.core.generated.reporter_pb2 import ListLogsReply, StreamLogReply
  from ray.core.generated.gcs_pb2 import ActorTableData, TaskEvents, TaskStateUpdate, TaskLogInfo
  from ray.dashboard.modules.actor.actor_head import actor_table_data_to_dict
  from ray.dashboard.modules.log.log_agent import find_offset_of_content_in_file, find_end_offset_file, find_end_offset_next_n_lines_from_offset, find_start_offset_last_n_lines_from_offset, LogAgentV1Grpc
  from ray.dashboard.modules.log.log_agent import _stream_log_in_chunk
  from ray.dashboard.modules.log.log_manager import LogsManager
  from ray.dashboard.tests.conftest import *
  from ray.util.state import get_log, list_logs, list_nodes, list_workers
  from ray.util.state.common import GetLogOptions
  from ray.util.state.exception import DataSourceUnavailable, RayStateApiException
  from ray.util.state.state_manager import StateDataSourceClient
label_desc: Use image node_id 4 for calling a global function with example usage: _write_lines_and_get_offset_at_index(f, num_lines, start_offset, trailing_new_line) and returns: offsets,  offset_end