1# Copyright 2021 The gRPC Authors 2# 3# Licensed under the Apache License, Version 2.0 (the "License"); 4# you may not use this file except in compliance with the License. 5# You may obtain a copy of the License at 6# 7# http://www.apache.org/licenses/LICENSE-2.0 8# 9# Unless required by applicable law or agreed to in writing, software 10# distributed under the License is distributed on an "AS IS" BASIS, 11# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12# See the License for the specific language governing permissions and 13# limitations under the License. 14"""The Python AsyncIO implementation of the gRPC client-side retry example.""" 15 16import asyncio 17import json 18import logging 19 20import grpc 21 22helloworld_pb2, helloworld_pb2_grpc = grpc.protos_and_services( 23 "helloworld.proto" 24) 25 26 27async def run() -> None: 28 # The ServiceConfig proto definition can be found: 29 # https://github.com/grpc/grpc-proto/blob/ec886024c2f7b7f597ba89d5b7d60c3f94627b17/grpc/service_config/service_config.proto#L377 30 service_config_json = json.dumps( 31 { 32 "methodConfig": [ 33 { 34 # To apply retry to all methods, put [{}] in the "name" field 35 "name": [ 36 {"service": "helloworld.Greeter", "method": "SayHello"} 37 ], 38 "retryPolicy": { 39 "maxAttempts": 5, 40 "initialBackoff": "0.1s", 41 "maxBackoff": "1s", 42 "backoffMultiplier": 2, 43 "retryableStatusCodes": ["UNAVAILABLE"], 44 }, 45 } 46 ] 47 } 48 ) 49 options = [] 50 # NOTE: the retry feature will be enabled by default >=v1.40.0 51 options.append(("grpc.enable_retries", 1)) 52 options.append(("grpc.service_config", service_config_json)) 53 async with grpc.aio.insecure_channel( 54 "localhost:50051", options=options 55 ) as channel: 56 stub = helloworld_pb2_grpc.GreeterStub(channel) 57 response = await stub.SayHello(helloworld_pb2.HelloRequest(name="you")) 58 print("Greeter client received: " + response.message) 59 60 61if __name__ == "__main__": 62 logging.basicConfig() 63 asyncio.run(run()) 64