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# Copyright 2021 The gRPC Authors
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""The Python implementation of the gRPC client-side retry example."""
import json
import logging
import grpc
helloworld_pb2, helloworld_pb2_grpc = grpc.protos_and_services(
"helloworld.proto")
def run():
# The ServiceConfig proto definition can be found:
# https://github.com/grpc/grpc-proto/blob/ec886024c2f7b7f597ba89d5b7d60c3f94627b17/grpc/service_config/service_config.proto#L377
service_config_json = json.dumps({
"methodConfig": [{
# To apply retry to all methods, put [{}] in the "name" field
"name": [{
"service": "helloworld.Greeter",
"method": "SayHello"
}],
"retryPolicy": {
"maxAttempts": 5,
"initialBackoff": "0.1s",
"maxBackoff": "1s",
"backoffMultiplier": 2,
"retryableStatusCodes": ["UNAVAILABLE"],
},
}]
})
options = []
# NOTE: the retry feature will be enabled by default >=v1.40.0
options.append(("grpc.enable_retries", 1))
options.append(("grpc.service_config", service_config_json))
with grpc.insecure_channel('localhost:50051', options=options) as channel:
stub = helloworld_pb2_grpc.GreeterStub(channel)
response = stub.SayHello(helloworld_pb2.HelloRequest(name='you'))
print("Greeter client received: " + response.message)
if __name__ == '__main__':
logging.basicConfig()
run()
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