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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.
"""A flaky backend for the gRPC Python retry example."""
import asyncio
import collections
import logging
import random
import grpc
helloworld_pb2, helloworld_pb2_grpc = grpc.protos_and_services(
"helloworld.proto")
class ErrorInjectingGreeter(helloworld_pb2_grpc.GreeterServicer):
def __init__(self):
self._counter = collections.defaultdict(int)
async def SayHello(
self, request: helloworld_pb2.HelloRequest,
context: grpc.aio.ServicerContext) -> helloworld_pb2.HelloReply:
self._counter[context.peer()] += 1
if self._counter[context.peer()] < 5:
if random.random() < 0.75:
logging.info('Injecting error to RPC from %s', context.peer())
await context.abort(grpc.StatusCode.UNAVAILABLE,
'injected error')
logging.info('Successfully responding to RPC from %s', context.peer())
return helloworld_pb2.HelloReply(message='Hello, %s!' % request.name)
async def serve() -> None:
server = grpc.aio.server()
helloworld_pb2_grpc.add_GreeterServicer_to_server(ErrorInjectingGreeter(),
server)
listen_addr = '[::]:50051'
server.add_insecure_port(listen_addr)
logging.info("Starting flaky server on %s", listen_addr)
await server.start()
await server.wait_for_termination()
if __name__ == '__main__':
logging.basicConfig(level=logging.INFO)
asyncio.run(serve())
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