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# Copyright 2023 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.
"""gRPC Python helloworld.Greeter client with health checking."""
import logging
from time import sleep
import grpc
from grpc_health.v1 import health_pb2
from grpc_health.v1 import health_pb2_grpc
import helloworld_pb2
import helloworld_pb2_grpc
def unary_call(stub: helloworld_pb2_grpc.GreeterStub, message: str):
response = stub.SayHello(helloworld_pb2.HelloRequest(name=message),
timeout=3)
print(f"Greeter client received: {response.message}")
def health_check_call(stub: health_pb2_grpc.HealthStub):
request = health_pb2.HealthCheckRequest(service="helloworld.Greeter")
resp = stub.Check(request)
if resp.status == health_pb2.HealthCheckResponse.SERVING:
print("server is serving")
elif resp.status == health_pb2.HealthCheckResponse.NOT_SERVING:
print("server stopped serving")
def run():
with grpc.insecure_channel('localhost:50051') as channel:
stub = helloworld_pb2_grpc.GreeterStub(channel)
health_stub = health_pb2_grpc.HealthStub(channel)
# Should succeed
unary_call(stub, 'you')
# Check health status every 1 second for 30 seconds
for _ in range(30):
health_check_call(health_stub)
sleep(1)
if __name__ == '__main__':
logging.basicConfig()
run()