求大佬指导grpc python进行安全连接的代码（有PHP版本的代码，不过改写成python找不到对应的api。。555）

from __future__ import print_function



import grpc



import historicalQuote_pb2

import historicalQuote_pb2_grpc

import common_pb2

import common_pb2_grpc

import marketData_pb2

import marketData_pb2_grpc



import os



from google import auth as google_auth

from google.auth.transport import grpc as google_auth_transport_grpc

from google.auth.transport import requests as google_auth_transport_requests



def run():

  	symbol = common_pb2.Symbol()

  	symbol.code = "BABA"

  	symbol.market = common_pb2.US

  	symbol.type = common_pb2.Stock



  	market_request = marketData_pb2.MarketDataRequest()

  	market_request.symbol.code = symbol.code

  	market_request.symbol.market = symbol.market

  	market_request.symbol.type = symbol.type

  	market_request.language = common_pb2.zhHans



	print(market_request)



  	try:

  		path = os.path.abspath('.')

		pemPath = path + '/open_test_cert.pem'

  		transport_creds = grpc.ssl_channel_credentials(open(pemPath).read())

  		options = []

  		update_metadata = {}

  		update_metadata2 = {}



  		update_metadata['UserName'] = 'xxxx'

  		update_metadata['Password'] = 'yyyy'

  		update_metadata2['grpc.ssl_target_name_override'] = 'open.test.yintongzhibo.com'

  		options.append(update_metadata)

  		# options.append(update_metadata2)

  		channel = grpc.secure_channel("open.test.yintongzhibo.com:9002",transport_creds,options)

		

		

		

  		# credentials , project= google_auth.default(scopes=(scope1,scope2,scope3))

  		# credentials , project= google_auth.default()

  		# http_request = google_auth_transport_requests.Request()

  		# metadata_plugin = AuthMetadataPlugin(credentials,http_request)

  		# google_auth_credentials = grpc.metadata_call_credentials(metadata_plugin)

  		# ssl_credentials = grpc.ssl_channel_credentials(open(pemPath).read())

  		# composite_credentials = grpc.composite_channel_credentials(ssl_credentials,google_auth_credentials)

  		# channel = grpc.secure_channel("open.test.yintongzhibo.com:9002",composite_credentials)

  		# channel = google_auth_transport_grpc.secure_authorized_channel(credentials,request,'open.test.yintongzhibo.com:9002')





		

  		stub = historicalQuote_pb2_grpc.HistoricalQuoteServiceStub(channel)

  		response = stub.getTodayM1Quotes(symbol)

  		# stub = marketData_pb2_grpc.MarketDataServiceStub(channel)

  		# response = stub.getMarketData(market_request)

  		print(response.message)

		

  	except Exception as e:

  		print (e)







if __name__ == '__main__':

  run()