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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
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59 lines
2.1 KiB
59 lines
2.1 KiB
3 years ago
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# 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 AsyncIO implementation of the gRPC client-side retry example."""
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import asyncio
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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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async def run() -> None:
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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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"methodConfig": [{
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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",
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"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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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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async with grpc.aio.insecure_channel('localhost:50051',
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options=options) as channel:
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stub = helloworld_pb2_grpc.GreeterStub(channel)
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response = await 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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asyncio.run(run())
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