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