code: def getSalt(self, request, context):
      if self.client_salt is not None:
          salt = self.client_salt
      else:
          salt = str(uuid4())
          self.client_salt = salt
  
      if self.client_secret is None:
          self.client_secret = request.secure_code
      elif self.client_secret != request.secure_code:
          salt = ""
  
      if self.client_shuffle_seed == 0:
          self.client_shuffle_seed = randint(0, 100)
      return SaltReply(salt_reply=salt)
  
file_path: BigDL/python/ppml/src/bigdl/ppml/fl/psi/psi_service.py
imports: import logging
  from random import randint
  from uuid import uuid4
  from bigdl.ppml.fl.psi.psi_intersection import PsiIntersection
  from bigdl.ppml.fl.nn.generated.psi_service_pb2_grpc import *
  from bigdl.ppml.fl.nn.generated.psi_service_pb2 import *
label_desc: Use image node_id 2 for calling the PSIServiceImpl obj's underlying member method code with example usage: obj.getSalt(request, context) and returns: SaltReply