code: def get_unique_resource_id(max_length=None):
      """
      Obtains a unique id that can be included in a resource name. This unique id is a valid
      DNS subname.
  
      Args:
          max_length: The maximum length of the identifier.
  
      Returns:
          A unique identifier that can be appended to a user-readable resource name to avoid
          naming collisions.
      """
      if max_length is not None and max_length <= 0:
          raise ValueError(
              "The specified maximum length for the unique resource id must be positive!"
          )
  
      uuid_bytes = uuid.uuid4().bytes
      # Use base64 encoding to shorten the UUID length. Note that the replacement of the
      # unsupported '+' symbol maintains uniqueness because the UUID byte string is of a fixed,
      # 16-byte length
      uuid_b64 = base64.b64encode(uuid_bytes)
      # In Python3, `uuid_b64` is a `bytes` object. It needs to be
      # converted to a string
      uuid_b64 = uuid_b64.decode("ascii")
      unique_id = (
          uuid_b64.rstrip("=\n")
          .replace("/", "-")
          .replace("+", "AB")
          .lower()
      )
      if max_length is not None:
          unique_id = unique_id[: int(max_length)]
      return unique_id
  
imports: import base64
  import inspect
  import logging
  import socket
  import subprocess
  import uuid
  from contextlib import closing
  from itertools import islice
  from sys import version_info
label_desc: Use image node_id 2 for calling a global function with example usage: get_unique_resource_id(max_length) and returns: unique_id