diff --git a/examples/python/Makefile b/examples/python/Makefile index 7d69b53d22e..8f41590ffdc 100644 --- a/examples/python/Makefile +++ b/examples/python/Makefile @@ -64,6 +64,10 @@ ARTIFACTS += data_transmission/demo_pb2.py ARTIFACTS += data_transmission/demo_pb2_grpc.py ARTIFACTS += data_transmission/demo_pb2.pyi +ARTIFACTS += lb_policies/helloworld_pb2.py +ARTIFACTS += lb_policies/helloworld_pb2_grpc.py +ARTIFACTS += lb_policies/helloworld_pb2.pyi + .PHONY: all all: ${ARTIFACTS} @@ -104,6 +108,9 @@ metadata/helloworld_pb2.py metadata/helloworld_pb2_grpc.py metadata/helloworld_p data_transmission/demo_pb2.py data_transmission/demo_pb2_grpc.py data_transmission/demo_pb2.pyi: data_transmission/demo.proto python3 -m grpc_tools.protoc --python_out=data_transmission --grpc_python_out=data_transmission --pyi_out=data_transmission -I data_transmission data_transmission/demo.proto +lb_policies/helloworld_pb2.py lb_policies/helloworld_pb2_grpc.py lb_policies/helloworld_pb2.pyi: ../protos/helloworld.proto + python3 -m grpc_tools.protoc --python_out=lb_policies --grpc_python_out=lb_policies --pyi_out=lb_policies -I ../protos ../protos/helloworld.proto + .PHONY: clean clean: rm -f ${ARTIFACTS} diff --git a/examples/python/lb_policies/greeter_client.py b/examples/python/lb_policies/greeter_client.py new file mode 100644 index 00000000000..4e785dbcae1 --- /dev/null +++ b/examples/python/lb_policies/greeter_client.py @@ -0,0 +1,36 @@ +# 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. +"""The Python implementation of the GRPC helloworld.Greeter client.""" + +import logging + +import grpc +import helloworld_pb2 +import helloworld_pb2_grpc + + +def run(): + print("Will try to greet world ...") + options = (("grpc.lb_policy_name", "round_robin"),) + # Load balancing takes effect when the DNS server returns multiple IPs for the DNS hostname. + # Replace "localhost" with such hostname to see the round robin LB policy take effect. + with grpc.insecure_channel('localhost:50051', options=options) as channel: + stub = helloworld_pb2_grpc.GreeterStub(channel) + response = stub.SayHello(helloworld_pb2.HelloRequest(name='you')) + print("Greeter client received: " + response.message) + + +if __name__ == '__main__': + logging.basicConfig() + run() diff --git a/examples/python/lb_policies/greeter_server.py b/examples/python/lb_policies/greeter_server.py new file mode 100644 index 00000000000..1b86e11761b --- /dev/null +++ b/examples/python/lb_policies/greeter_server.py @@ -0,0 +1,42 @@ +# 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. +"""The Python implementation of the GRPC helloworld.Greeter server.""" + +from concurrent import futures +import logging + +import grpc +import helloworld_pb2 +import helloworld_pb2_grpc + + +class Greeter(helloworld_pb2_grpc.GreeterServicer): + + def SayHello(self, request, context): + return helloworld_pb2.HelloReply(message='Hello, %s!' % request.name) + + +def serve(): + port = '50051' + server = grpc.server(futures.ThreadPoolExecutor(max_workers=10)) + helloworld_pb2_grpc.add_GreeterServicer_to_server(Greeter(), server) + server.add_insecure_port('[::]:' + port) + server.start() + print("Server started, listening on " + port) + server.wait_for_termination() + + +if __name__ == '__main__': + logging.basicConfig() + serve() diff --git a/examples/python/lb_policies/helloworld_pb2.py b/examples/python/lb_policies/helloworld_pb2.py new file mode 100644 index 00000000000..f5b4f2d27dc --- /dev/null +++ b/examples/python/lb_policies/helloworld_pb2.py @@ -0,0 +1,30 @@ +# -*- coding: utf-8 -*- +# Generated by the protocol buffer compiler. DO NOT EDIT! +# source: helloworld.proto +"""Generated protocol buffer code.""" +from google.protobuf.internal import builder as _builder +from google.protobuf import descriptor as _descriptor +from google.protobuf import descriptor_pool as _descriptor_pool +from google.protobuf import symbol_database as _symbol_database +# @@protoc_insertion_point(imports) + +_sym_db = _symbol_database.Default() + + + + +DESCRIPTOR = _descriptor_pool.Default().AddSerializedFile(b'\n\x10helloworld.proto\x12\nhelloworld\"\x1c\n\x0cHelloRequest\x12\x0c\n\x04name\x18\x01 \x01(\t\"\x1d\n\nHelloReply\x12\x0f\n\x07message\x18\x01 \x01(\t2I\n\x07Greeter\x12>\n\x08SayHello\x12\x18.helloworld.HelloRequest\x1a\x16.helloworld.HelloReply\"\x00\x42\x36\n\x1bio.grpc.examples.helloworldB\x0fHelloWorldProtoP\x01\xa2\x02\x03HLWb\x06proto3') + +_builder.BuildMessageAndEnumDescriptors(DESCRIPTOR, globals()) +_builder.BuildTopDescriptorsAndMessages(DESCRIPTOR, 'helloworld_pb2', globals()) +if _descriptor._USE_C_DESCRIPTORS == False: + + DESCRIPTOR._options = None + DESCRIPTOR._serialized_options = b'\n\033io.grpc.examples.helloworldB\017HelloWorldProtoP\001\242\002\003HLW' + _HELLOREQUEST._serialized_start=32 + _HELLOREQUEST._serialized_end=60 + _HELLOREPLY._serialized_start=62 + _HELLOREPLY._serialized_end=91 + _GREETER._serialized_start=93 + _GREETER._serialized_end=166 +# @@protoc_insertion_point(module_scope) diff --git a/examples/python/lb_policies/helloworld_pb2.pyi b/examples/python/lb_policies/helloworld_pb2.pyi new file mode 100644 index 00000000000..8c4b5b22805 --- /dev/null +++ b/examples/python/lb_policies/helloworld_pb2.pyi @@ -0,0 +1,17 @@ +from google.protobuf import descriptor as _descriptor +from google.protobuf import message as _message +from typing import ClassVar as _ClassVar, Optional as _Optional + +DESCRIPTOR: _descriptor.FileDescriptor + +class HelloReply(_message.Message): + __slots__ = ["message"] + MESSAGE_FIELD_NUMBER: _ClassVar[int] + message: str + def __init__(self, message: _Optional[str] = ...) -> None: ... + +class HelloRequest(_message.Message): + __slots__ = ["name"] + NAME_FIELD_NUMBER: _ClassVar[int] + name: str + def __init__(self, name: _Optional[str] = ...) -> None: ... diff --git a/examples/python/lb_policies/helloworld_pb2_grpc.py b/examples/python/lb_policies/helloworld_pb2_grpc.py new file mode 100644 index 00000000000..47c186976e1 --- /dev/null +++ b/examples/python/lb_policies/helloworld_pb2_grpc.py @@ -0,0 +1,70 @@ +# Generated by the gRPC Python protocol compiler plugin. DO NOT EDIT! +"""Client and server classes corresponding to protobuf-defined services.""" +import grpc + +import helloworld_pb2 as helloworld__pb2 + + +class GreeterStub(object): + """The greeting service definition. + """ + + def __init__(self, channel): + """Constructor. + + Args: + channel: A grpc.Channel. + """ + self.SayHello = channel.unary_unary( + '/helloworld.Greeter/SayHello', + request_serializer=helloworld__pb2.HelloRequest.SerializeToString, + response_deserializer=helloworld__pb2.HelloReply.FromString, + ) + + +class GreeterServicer(object): + """The greeting service definition. + """ + + def SayHello(self, request, context): + """Sends a greeting + """ + context.set_code(grpc.StatusCode.UNIMPLEMENTED) + context.set_details('Method not implemented!') + raise NotImplementedError('Method not implemented!') + + +def add_GreeterServicer_to_server(servicer, server): + rpc_method_handlers = { + 'SayHello': grpc.unary_unary_rpc_method_handler( + servicer.SayHello, + request_deserializer=helloworld__pb2.HelloRequest.FromString, + response_serializer=helloworld__pb2.HelloReply.SerializeToString, + ), + } + generic_handler = grpc.method_handlers_generic_handler( + 'helloworld.Greeter', rpc_method_handlers) + server.add_generic_rpc_handlers((generic_handler,)) + + + # This class is part of an EXPERIMENTAL API. +class Greeter(object): + """The greeting service definition. + """ + + @staticmethod + def SayHello(request, + target, + options=(), + channel_credentials=None, + call_credentials=None, + insecure=False, + compression=None, + wait_for_ready=None, + timeout=None, + metadata=None): + return grpc.experimental.unary_unary(request, target, '/helloworld.Greeter/SayHello', + helloworld__pb2.HelloRequest.SerializeToString, + helloworld__pb2.HelloReply.FromString, + options, channel_credentials, + insecure, call_credentials, compression, wait_for_ready, timeout, metadata)