107 lines
3.4 KiB
C++
107 lines
3.4 KiB
C++
/*
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*
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* Copyright 2015 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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*
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*/
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#include <iostream>
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#include <memory>
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#include <string>
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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 "hello_world.pb.h"
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#include <grpcpp/server_context.h>
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#include <grpcpp/support/server_callback.h>
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#include <grpcpp/support/status.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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#include <grpcpp/health_check_service_interface.h>
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#ifdef BAZEL_BUILD
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#include "examples/protos/helloworld.grpc.pb.h"
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#else
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#include "hello_world.grpc.pb.h"
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#endif
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void RunServer(uint16_t port);
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using grpc::Server;
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using grpc::ServerBuilder;
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ABSL_FLAG(uint16_t, port, 50051, "Server port for the service");
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// This is the implementation of the actual service;
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// We elect to implement this as a callback server (preferred implementation)
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class GreeterServiceImpl final : public Greeter::CallbackService {
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public:
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// We only reply with a single message back, thus we use a unary reactor
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grpc::ServerUnaryReactor *
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SayHello([[maybe_unused]] grpc::CallbackServerContext *context,
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const HelloRequest *request, HelloReply *reply) override {
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// To be able to handle more fancy things, we elect to implement our own
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// reactor
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class HelloReactor : public grpc::ServerUnaryReactor {
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public:
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HelloReactor(const HelloRequest &request, const std::string &prefix,
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HelloReply *reply) {
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reply->set_message(prefix + request.name());
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Finish(grpc::Status::OK);
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}
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private:
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void OnDone() override {
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std::cout << "RPC completed." << std::endl;
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delete this;
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}
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void OnCancel() override { std::cerr << "RPC cancelled." << std::endl; }
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};
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return new HelloReactor(*request, "Hello ", reply);
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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::EnableDefaultHealthCheckService(true);
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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 << std::endl;
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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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