code: def _find_address_from_flag(flag: str):
      """
      Attempts to find all valid Ray addresses on this node, specified by the
      flag.
  
      Params:
          flag: `--redis-address` or `--gcs-address`
      Returns:
          Set of detected addresses.
      """
      # Using Redis address `--redis-address` as an example:
      # Currently, this extracts the deprecated --redis-address from the command
      # that launched the raylet running on this node, if any. Anyone looking to
      # edit this function should be warned that these commands look like, for
      # example:
      # /usr/local/lib/python3.8/dist-packages/ray/core/src/ray/raylet/raylet
      # --redis_address=123.456.78.910 --node_ip_address=123.456.78.910
      # --raylet_socket_name=... --store_socket_name=... --object_manager_port=0
      # --min_worker_port=10000 --max_worker_port=19999
      # --node_manager_port=58578 --redis_port=6379
      # --maximum_startup_concurrency=8
      # --static_resource_list=node:123.456.78.910,1.0,object_store_memory,66
      # --config_list=plasma_store_as_thread,True
      # --python_worker_command=/usr/bin/python
      #     /usr/local/lib/python3.8/dist-packages/ray/workers/default_worker.py
      #     --redis-address=123.456.78.910:6379
      #     --node-ip-address=123.456.78.910 --node-manager-port=58578
      #     --object-store-name=... --raylet-name=...
      #     --temp-dir=/tmp/ray
      #     --metrics-agent-port=41856 --redis-password=[MASKED]
      #     --java_worker_command= --cpp_worker_command=
      #     --redis_password=[MASKED] --temp_dir=/tmp/ray --session_dir=...
      #     --metrics-agent-port=41856 --metrics_export_port=64229
      #     --dashboard_agent_command=/usr/bin/python
      #     -u /usr/local/lib/python3.8/dist-packages/ray/dashboard/agent.py
      #         --redis-address=123.456.78.910:6379 --metrics-export-port=64229
      #         --dashboard-agent-port=41856 --node-manager-port=58578
      #         --object-store-name=... --raylet-name=... --temp-dir=/tmp/ray
      #         --log-dir=/tmp/ray/session_2020-11-08_14-29-07_199128_278000/logs
      #         --redis-password=[MASKED] --object_store_memory=5037192806
      #         --plasma_directory=/tmp
      # Longer arguments are elided with ... but all arguments from this instance
      # are included, to provide a sense of what is in these.
      # Indeed, we had to pull --redis-address to the front of each call to make
      # this readable.
      # As you can see, this is very long and complex, which is why we can't
      # simply extract all the the arguments using regular expressions and
      # present a dict as if we never lost track of these arguments, for
      # example. Picking out --redis-address below looks like it might grab the
      # wrong thing, but double-checking that we're finding the correct process
      # by checking that the contents look like we expect would probably be prone
      # to choking in unexpected ways.
      # Notice that --redis-address appears twice. This is not a copy-paste
      # error; this is the reason why the for loop below attempts to pick out
      # every appearance of --redis-address.
  
      # The --redis-address here is what is now called the --address, but it
      # appears in the default_worker.py and agent.py calls as --redis-address.
      pids = psutil.pids()
      addresses = set()
      for pid in pids:
          try:
              proc = psutil.Process(pid)
              # HACK: Workaround for UNIX idiosyncrasy
              # Normally, cmdline() is supposed to return the argument list.
              # But it in some cases (such as when setproctitle is called),
              # an arbitrary string resembling a command-line is stored in
              # the first argument.
              # Explanation: https://unix.stackexchange.com/a/432681
              # More info: https://github.com/giampaolo/psutil/issues/1179
              cmdline = proc.cmdline()
              # NOTE(kfstorm): To support Windows, we can't use
              # `os.path.basename(cmdline[0]) == "raylet"` here.
  
              if len(cmdline) > 0 and "raylet" in os.path.basename(
                  cmdline[0]
              ):
                  for arglist in cmdline:
                      # Given we're merely seeking --redis-address, we just split
                      # every argument on spaces for now.
                      for arg in arglist.split(" "):
                          # TODO(ekl): Find a robust solution for locating Redis.
                          if arg.startswith(flag):
                              proc_addr = arg.split("=")[1]
                              # TODO(mwtian): remove this workaround after Ray
                              # no longer sets --redis-address to None.
                              if (
                                  proc_addr != ""
                                  and proc_addr != "None"
                              ):
                                  addresses.add(proc_addr)
          except psutil.AccessDenied:
              pass
          except psutil.NoSuchProcess:
              pass
      return addresses
  
imports: import base64
  import collections
  import errno
  import io
  import json
  import logging
  import mmap
  import multiprocessing
  import os
  import random
  import shutil
  import signal
  import socket
  import subprocess
  import sys
  import time
  from pathlib import Path
  from typing import List, Optional, IO, AnyStr
  import psutil
  from filelock import FileLock
  import ray
  import ray._private.ray_constants
  from ray._raylet import GcsClient, GcsClientOptions
  from ray.core.generated.common_pb2 import Language
  from ray._private.ray_constants import RAY_NODE_IP_FILENAME
label_desc: Use image node_id 10 for calling a global function with example usage: _find_address_from_flag(flag) and returns: addresses