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