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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
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83 lines
2.6 KiB
83 lines
2.6 KiB
# Copyright 2020 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 example of utilizing Channelz feature.""" |
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import argparse |
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import asyncio |
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import logging |
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import random |
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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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# TODO: Suppress until the macOS segfault fix rolled out |
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from grpc_channelz.v1 import channelz # pylint: disable=wrong-import-position |
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_LOGGER = logging.getLogger(__name__) |
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_LOGGER.setLevel(logging.INFO) |
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_RANDOM_FAILURE_RATE = 0.3 |
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class FaultInjectGreeter(helloworld_pb2_grpc.GreeterServicer): |
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def __init__(self, failure_rate): |
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self._failure_rate = failure_rate |
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async def SayHello( |
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self, request: helloworld_pb2.HelloRequest, |
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context: grpc.aio.ServicerContext) -> helloworld_pb2.HelloReply: |
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if random.random() < self._failure_rate: |
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context.abort(grpc.StatusCode.UNAVAILABLE, |
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'Randomly injected failure.') |
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return helloworld_pb2.HelloReply(message=f'Hello, {request.name}!') |
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def create_server(addr: str, failure_rate: float) -> grpc.aio.Server: |
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server = grpc.aio.server() |
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helloworld_pb2_grpc.add_GreeterServicer_to_server( |
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FaultInjectGreeter(failure_rate), server) |
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# Add Channelz Servicer to the gRPC server |
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channelz.add_channelz_servicer(server) |
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server.add_insecure_port(addr) |
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return server |
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async def main() -> None: |
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parser = argparse.ArgumentParser() |
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parser.add_argument('--addr', |
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nargs=1, |
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type=str, |
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default='[::]:50051', |
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help='the address to listen on') |
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parser.add_argument( |
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'--failure_rate', |
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nargs=1, |
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type=float, |
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default=0.3, |
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help='a float indicates the percentage of failed message injections') |
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args = parser.parse_args() |
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server = create_server(addr=args.addr, failure_rate=args.failure_rate) |
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await server.start() |
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await server.wait_for_termination() |
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if __name__ == '__main__': |
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logging.basicConfig(level=logging.INFO) |
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asyncio.get_event_loop().run_until_complete(main())
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