xref: /aosp_15_r20/external/grpc-grpc/examples/python/helloworld/greeter_client_reflection.py (revision cc02d7e222339f7a4f6ba5f422e6413f4bd931f2)
1 # Copyright 2023 gRPC authors.
2 #
3 # Licensed under the Apache License, Version 2.0 (the "License");
4 # you may not use this file except in compliance with the License.
5 # You may obtain a copy of the License at
6 #
7 #     http://www.apache.org/licenses/LICENSE-2.0
8 #
9 # Unless required by applicable law or agreed to in writing, software
10 # distributed under the License is distributed on an "AS IS" BASIS,
11 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 # See the License for the specific language governing permissions and
13 # limitations under the License.
14 """The Python implementation of the GRPC helloworld.Greeter client with reflection."""
15 
16 import logging
17 
18 from google.protobuf.descriptor_pool import DescriptorPool
19 import grpc
20 from grpc_reflection.v1alpha.proto_reflection_descriptor_database import (
21     ProtoReflectionDescriptorDatabase,
22 )
23 
24 
25 def run():
26     print("Will try to greet world ...")
27     with grpc.insecure_channel("localhost:50051") as channel:
28         reflection_db = ProtoReflectionDescriptorDatabase(channel)
29         services = reflection_db.get_services()
30         print(f"found services: {services}")
31 
32         desc_pool = DescriptorPool(reflection_db)
33         service_desc = desc_pool.FindServiceByName("helloworld.Greeter")
34         print(f"found Greeter service with name: {service_desc.full_name}")
35         for methods in service_desc.methods:
36             print(f"found method name: {methods.full_name}")
37             input_type = methods.input_type
38             print(f"input type for this method: {input_type.full_name}")
39 
40         request_desc = desc_pool.FindMessageTypeByName(
41             "helloworld.HelloRequest"
42         )
43         print(f"found request name: {request_desc.full_name}")
44 
45 
46 if __name__ == "__main__":
47     logging.basicConfig()
48     run()
49