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The C based gRPC (C++, Python, Ruby, Objective-C, PHP, C#)
https://grpc.io/
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75 lines
2.6 KiB
75 lines
2.6 KiB
2 years ago
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// Copyright 2023 The gRPC Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include <iostream>
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#include "absl/flags/flag.h"
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#include "absl/flags/parse.h"
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#include "absl/strings/str_format.h"
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#include "examples/protos/helloworld.grpc.pb.h"
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#include <grpcpp/ext/proto_server_reflection_plugin.h>
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#include <grpcpp/grpcpp.h>
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using grpc::CallbackServerContext;
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using grpc::Server;
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using grpc::ServerBuilder;
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using grpc::ServerUnaryReactor;
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using grpc::Status;
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using helloworld::Greeter;
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using helloworld::HelloReply;
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using helloworld::HelloRequest;
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ABSL_FLAG(uint16_t, port, 50051, "Server port for the service");
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// Logic and data behind the server's behavior.
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class GreeterServiceImpl final : public Greeter::CallbackService {
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ServerUnaryReactor* SayHello(CallbackServerContext* context,
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const HelloRequest* request,
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HelloReply* reply) override {
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std::string prefix("Hello ");
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reply->set_message(prefix + request->name());
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ServerUnaryReactor* reactor = context->DefaultReactor();
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reactor->Finish(Status::OK);
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return reactor;
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}
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};
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void RunServer(uint16_t port) {
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std::string server_address = absl::StrFormat("0.0.0.0:%d", port);
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GreeterServiceImpl service;
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grpc::reflection::InitProtoReflectionServerBuilderPlugin();
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ServerBuilder builder;
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// Listen on the given address without any authentication mechanism.
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builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
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// Register "service" as the instance through which we'll communicate with
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// clients. In this case it corresponds to an *synchronous* service.
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builder.RegisterService(&service);
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// Finally assemble the server.
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std::unique_ptr<Server> server(builder.BuildAndStart());
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std::cout << "Server listening on " << server_address << '\n';
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// Wait for the server to shutdown. Note that some other thread must be
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// responsible for shutting down the server for this call to ever return.
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server->Wait();
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}
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int main(int argc, char** argv) {
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absl::ParseCommandLine(argc, argv);
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RunServer(absl::GetFlag(FLAGS_port));
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return 0;
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}
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